* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Pretendard', 'Inter', sans-serif;
    height: 100%;
    overflow: hidden;
    /* body 스크롤바 숨기기 */
    scrollbar-width: none; /* Firefox */
    -ms-overflow-style: none; /* IE and Edge */
}

/*  FOUC 완전 방지: 라이트/다크 모드 배경색 - html 클래스 기준 */
html:not(.dark-mode) {
    background-color: #ffffff;
    color: #1e293b;
}

html.dark-mode {
    background-color: rgb(32, 33, 37) !important;
    color: #e2e8f0 !important;
}

html::-webkit-scrollbar {
    display: none; /* Chrome, Safari, Opera */
}

/* Sora/Claude 스타일 AI UI - 데스크탑 우선 */
/*  FOUC 완전 방지: body 배경색을 html 클래스 기준으로 설정 */
body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Pretendard', 'Inter', sans-serif;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    margin: 0;
    padding: 0;
    height: 100%;
    overflow: hidden;
    /* body 스크롤바 숨기기 */
    scrollbar-width: none; /* Firefox */
    -ms-overflow-style: none; /* IE and Edge */
    /*  FOUC 방지: transition 완전 제거 */
    transition: none !important;
}

/*  FOUC 완전 방지: 라이트 모드 body 배경 */
body:not(.dark-mode) {
    background: linear-gradient(135deg, #f8fafc 0%, #f1f5f9 50%, #e2e8f0 100%);
    background-attachment: fixed;
    color: #1e293b;
}

/*  FOUC 완전 방지: 다크 모드 body 배경 */
body.dark-mode {
    background: rgb(32, 33, 37) !important;
    background-color: rgb(32, 33, 37) !important;
    color: #e2e8f0 !important;
}

body::-webkit-scrollbar {
    display: none; /* Chrome, Safari, Opera */
}

/* 모든 텍스트 요소에 동일한 폰트 적용 */
button, input, select, textarea, a, span, div, p, h1, h2, h3, h4, h5, h6, label {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Pretendard', 'Inter', sans-serif;
}

/* font-weight transition 차단 - 모든 모드에서 적용 */
/*  FOUC 방지: background-color, background 제거 - 깜빡임 방지 */
*,
*::before,
*::after {
    transition-property: color, border-color, box-shadow, opacity, transform, width, height, padding, margin, left, right, top, bottom, background-image, background-position, filter, backdrop-filter, -webkit-backdrop-filter !important;
}

.lx_app_wrap {
    height: 100vh;
    display: flex;
    flex-direction: column;
    margin: 0;
    padding: 0;
    width: 100%;
    overflow-y: auto;
    overflow-x: hidden;
    /* 스크롤바 숨기기 */
    scrollbar-width: none; /* Firefox */
    -ms-overflow-style: none; /* IE and Edge */
}

.lx_app_wrap::-webkit-scrollbar {
    display: none; /* Chrome, Safari, Opera */
}

/* Global Navigation Bar - 토스/클로드 스타일 Light glass bar */
.lx_app_header {
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    padding: 13px 20px;
    border-bottom: 1px solid rgba(0, 0, 0, 0.08);
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: relative;
    width: 100%;
    margin: 0;
}

.lx_app_header.sticky {
    position: sticky;
    top: 0;
    z-index: 1000;
}

.brand {
    display: flex;
    align-items: center;
    gap: 6px;
    flex-shrink: 0;
    position: relative;
}

/* Q&A 버튼 - 데스크탑/모바일 분리 */
.qa-btn-mobile {
    display: none !important;
}

.qa-btn-desktop {
    display: inline-flex !important;
}

.brand .logo,
.brand h1.logo {
    margin: 0;
    padding: 0;
    line-height: 1;
    display: flex;
    align-items: center;
    height: 100%;
}

.brand .logo a {
    color: #1e293b;
    font-weight: 700;
    font-size: 24px;
    letter-spacing: -0.3px;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    line-height: 1;
    vertical-align: middle;
}

.brand .logo img,
.brand .logo-img {
    height: 32px;
    width: auto;
    object-fit: contain;
    display: block;
}

.brand .logo a {
    display: inline-block;
    position: relative;
    line-height: 0;
}

.brand .logo-img {
    display: block;
}

.brand .logo-img.logo-light {
    display: block;
}

.brand .logo-img.logo-dark {
    display: none;
    position: absolute;
    top: 0;
    left: 0;
}

/* 로고 드롭다운 메뉴 */
.logo-dropdown-menu {
    position: absolute;
    top: 155%;
    left: -18px;
    background: white;
    border-radius: 0;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15) !important;
    border: 1px solid rgba(0, 0, 0, 0.06);
    min-width: 160px;
    width: auto;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.2s ease;
    z-index: 1001;
    overflow: hidden;
    padding: 0;
}

.logo-dropdown-menu.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.logo-dropdown-item {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 12px 20px;
    color: #475569;
    text-decoration: none;
    font-size: 16px;
    font-weight: 500;
    transition: background-color 0.2s ease;
    cursor: pointer;
    position: relative;
}

.logo-dropdown-item:not(:last-child) {
    border-bottom: 1px solid rgba(0, 0, 0, 0.08);
}

.logo-dropdown-item:hover {
    background-color: #f8fafc;
    color: #4f46e5;
}

.logo-dropdown-img {
    height: 32px;
    width: auto;
    object-fit: contain;
    display: block;
}

.logo-dropdown-img.logo-dropdown-light {
    display: block;
}

.logo-dropdown-img.logo-dropdown-dark {
    display: none;
}

.separator-dot {
    display: inline-block;
    width: 6px;
    height: 6px;
    background-color: #999;
    border-radius: 50%;
    margin: 0 4px;
    vertical-align: middle;
}

.brand .name {
    font-size: 32px;
    font-weight: 300;
    color: #475569;
    margin: 0;
}

.menu {
    display: flex;
    align-items: center;
    gap: 20px;
}

/* 네비게이션 탭 */
.nav-tabs {
    display: flex;
    align-items: center;
    gap: 8px;
    flex: 1;
    justify-content: flex-start;
    height: 100%;
}

.nav-tab {
    padding: 8px 16px;
    color: #1e293b;
    text-decoration: none;
    font-size: 16px;
    font-weight: 500;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Pretendard', 'Inter', sans-serif;
    border-radius: 6px;
    transition: all 0.2s ease;
    position: relative;
    display: inline-flex;
    align-items: center;
    line-height: 1;
}

.nav-tab:hover {
    color: #4f46e5;
}

.nav-tab.active {
    color: #4f46e5;
    font-weight: 600;
}

.nav-tab.active::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 16px;
    right: 16px;
    height: 2px;
    background-color: #4f46e5;
    border-radius: 2px 2px 0 0;
}

/* 헤더 오른쪽 영역 */
.header-right {
    display: flex;
    align-items: center;
    gap: 12px;
    position: relative;
    flex-shrink: 0;
    margin-right: 0;
}

/* 크레딧 표시 */
.credit-display {
    display: flex;
    align-items: center;
    gap: 4px;
    font-size: 16px;
}

.credit-label {
    color: #1e293b;
    font-weight: 500;
}

.credit-amount {
    color: #1e293b;
    font-weight: 500;
}

/* 비회원 크레딧 표시 - 항상 숨김 (비회원일 때는 크레딧 표시 안 함) */
.guest-credit-display {
    display: none !important;
    align-items: center;
    gap: 4px;
    font-size: 16px;
    color: #4f46e5;
    font-weight: 600;
}

/* 로그인 후 사용자 정보 영역 */
.user-info-area {
    display: none;
    align-items: center;
    gap: 16px;
    position: relative;
}

.user-info-area.logged-in {
    display: flex;
}

/* 헤더 크레딧 표시 */
.header-credit-display {
    display: flex;
    align-items: center;
    gap: 4px;
    font-size: 16px;
    color: #4f46e5;
    font-weight: 600;
}

.header-credit-display .credit-value {
    color: #4f46e5;
}

.header-credit-display .credit-label {
    color: #4f46e5;
}

/* 사용자 이메일 표시 */
.user-email-display {
    display: flex;
    align-items: center;
    gap: 4px;
    cursor: pointer;
    padding: 4px 8px;
    border-radius: 6px;
    /*  FOUC 방지: background-color transition 제거 */
    transition: none;
}


.user-email-text {
    font-size: 16px;
    font-weight: 500;
    color: #1e293b;
}

.user-dropdown-icon {
    font-size: 10px;
    color: #64748b;
    transition: transform 0.2s ease;
}

.user-email-display.active .user-dropdown-icon {
    transform: rotate(180deg);
}

/* 사용자 드롭다운 메뉴 */
.user-dropdown-menu {
    position: absolute;
    top: calc(100% + 8px);
    right: 130px;
    background: white;
    border-radius: 16px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15) !important;
    border: 1px solid rgba(0, 0, 0, 0.06);
    min-width: 220px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.2s ease;
    z-index: 1001;
    overflow: hidden;
    padding: 12px 0;
}

.user-dropdown-menu.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

/* 드롭다운 헤더 - 크레딧 뱃지 + 이메일 */
.user-dropdown-header {
    padding: 0 20px 16px 20px;
    border-bottom: 1px solid #f1f5f9;
    text-align: center;
}

.dropdown-credit-badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 8px 16px;
    background: linear-gradient(135deg, #4f46e5 0%, #6366f1 100%);
    border-radius: 20px;
    color: white;
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 12px;
}

.dropdown-user-email {
    font-size: 16px;
    font-weight: 500;
    color: #1e293b;
}

/* 드롭다운 메뉴 아이템 */
.user-dropdown-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 20px;
    color: #475569;
    text-decoration: none;
    font-size: 16px;
    /*  FOUC 방지: background-color transition 제거 */
    transition: none;
    cursor: pointer;
}

.user-dropdown-item:hover {
    background-color: #f8fafc;
}

.user-dropdown-item i {
    width: 18px;
    text-align: center;
    color: #64748b;
    font-size: 16px;
}

.user-dropdown-item.logout {
    color: #64748b;
    margin-top: 8px;
    border-top: 1px solid #f1f5f9;
    padding-top: 12px;
}

.user-dropdown-item.logout i {
    color: #64748b;
}

.user-dropdown-item.logout:hover {
    color: #dc2626;
}

.user-dropdown-item.logout:hover i {
    color: #dc2626;
}

/* 비로그인 상태 버튼 영역 */
.auth-buttons {
    display: flex;
    align-items: center;
    gap: 8px;
}

.auth-buttons.logged-in {
    display: none;
}

/* 헤더 버튼 */
.header-btn {
    padding: 8px 16px;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 500;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Pretendard', 'Inter', sans-serif;
    border: none;
    cursor: pointer;
    transition: all 0.2s ease;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    white-space: nowrap;
    height: 40px;
    box-sizing: border-box;
}

.login-btn {
    background-color: #4f46e5;
    color: white;
}

.login-btn:hover {
    background-color: #4338ca;
}

.signup-btn {
    background-color: white;
    color: #4f46e5;
    border: 1px solid #4f46e5;
}

.signup-btn:hover {
    background-color: #eef2ff;
}

.work-btn {
    background-color: white;
    color: #64748b;
    border: 1px solid #e2e8f0;
}

.work-btn:hover {
    background-color: #f8fafc;
    color: #1e293b;
}

.work-link {
    color: #1e293b;
    text-decoration: none;
    font-size: 16px;
    font-weight: 500;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Pretendard', 'Inter', sans-serif;
    cursor: pointer;
    transition: color 0.2s ease;
}

.work-link:hover {
    color: #4f46e5;
}

/* 다크모드 토글 */
.dark-mode-toggle-wrapper {
    display: flex;
    align-items: center;
    margin-right: 8px;
}

/* 다크모드 토글 스위치 */
.dark-mode-toggle {
    padding: 0;
    background: transparent;
    border: none;
    cursor: pointer;
    transition: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 60px;
    height: 32px;
    position: relative;
}

.toggle-track {
    position: relative;
    width: 100%;
    height: 100%;
    border-radius: 16px;
    background: #E5E7EB;
    /*  FOUC 방지: background transition 제거 */
    transition: none;
    display: flex;
    align-items: center;
    padding: 2px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

/* body에 dark-mode 클래스가 있으면 초기 상태를 다크모드로 설정 (깜빡임 방지) */
body.dark-mode .toggle-track {
    background: #374151;
}

.dark-mode-toggle.dark-mode-active .toggle-track {
    background: #374151;
}

.toggle-knob {
    position: absolute;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: #9CA3AF;
    /*  FOUC 방지: background transition 제거 */
    transition: left 0.3s ease;
    left: 2px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
    z-index: 2;
}

/* body에 dark-mode 클래스가 있으면 초기 상태를 다크모드로 설정 (깜빡임 방지) */
body.dark-mode .toggle-knob {
    left: calc(100% - 30px);
    background: #ffffff;
}

.dark-mode-toggle.dark-mode-active .toggle-knob {
    left: calc(100% - 30px);
    background: #ffffff;
}

.toggle-icon-dark,
.toggle-icon-light {
    position: absolute;
    font-size: 14px;
    transition: opacity 0.3s ease, color 0.3s ease;
    z-index: 1;
    display: flex;
    align-items: center;
    justify-content: center;
}

.toggle-icon-dark {
    left: 8px;
    color: #6B7280;
    opacity: 0;
}

.toggle-icon-dark i {
    color: inherit;
}

.toggle-icon-light {
    right: 8px;
    color: #F59E0B;
    opacity: 1;
}

.toggle-icon-light i {
    color: inherit;
}

/* body에 dark-mode 클래스가 있으면 초기 상태를 다크모드로 설정 (깜빡임 방지) */
body.dark-mode .toggle-icon-dark {
    opacity: 1;
    color: #ffffff;
}

body.dark-mode .toggle-icon-dark i {
    color: #ffffff;
}

body.dark-mode .toggle-icon-light {
    opacity: 0;
}

.dark-mode-toggle.dark-mode-active .toggle-icon-dark {
    opacity: 1;
    color: #ffffff;
}

.dark-mode-toggle.dark-mode-active .toggle-icon-dark i {
    color: #ffffff;
}

.dark-mode-toggle.dark-mode-active .toggle-icon-light {
    opacity: 0;
}

.dark-mode-toggle:hover .toggle-track {
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.dark-mode-toggle:hover {
    transform: none;
}

/* 다크모드 스타일 - 기본 배경색은 상단에서 정의됨, 여기서는 컴포넌트 스타일만 */
body.dark-mode .lx_app_header {
    background-color: rgb(32, 33, 37);
    border-bottom-color: rgba(255, 255, 255, 0.1);
}

body.dark-mode .nav-tab {
    color: #ffffff;
}

body.dark-mode .nav-tab.active,
body.dark-mode .nav-tab:hover {
    color: #ffffff;
    border-bottom-color: #667eea;
}

body.dark-mode .header-btn {
    background-color: #334155;
    color: #ffffff;
    border-color: #475569;
}

body.dark-mode .header-btn:hover {
    background-color: #475569;
}

body.dark-mode .cp_cols {
    background-color: rgb(17, 18, 22);
    border-color: rgba(255, 255, 255, 0.1);
}

body.dark-mode .cp_title_wrapper {
    background-color: rgb(17, 18, 22);
    border-bottom-color: rgba(255, 255, 255, 0.1);
}

body.dark-mode .cp_title {
    color: #ffffff;
}

body.dark-mode .text-block {
    background-color: #334155;
    border-color: #475569;
    color: #ffffff;
}

body.dark-mode .text-block-content {
    color: #ffffff;
}

/* 다크모드 사용자 이메일 표시 */
body.dark-mode .user-email-text {
    color: #ffffff;
}

body.dark-mode .dropdown-user-email {
    color: #ffffff;
}

body.dark-mode .user-dropdown-item {
    color: #ffffff;
}

.menu-btn {
    background-color: white;
    color: #1e293b;
    padding: 8px;
    width: 40px;
    height: 40px;
    border-radius: 6px;
    border: 1px solid rgba(0, 0, 0, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
}

.menu-btn:hover {
    background-color: #f8fafc;
}

.menu-btn .dots {
    display: grid;
    grid-template-columns: repeat(3, 4px);
    grid-template-rows: repeat(3, 4px);
    gap: 3px;
    width: 18px;
    height: 18px;
}

.menu-btn .dots span {
    background-color: #ffffff;
    border-radius: 50%;
    width: 4px;
    height: 4px;
}

.menu-btn svg {
    width: 20px;
    height: 20px;
}

/* 데스크탑에서 새로고침 버튼 숨기기 */
.refresh-btn-mobile {
    display: none;
}

/* 과목 선택 버튼을 가운데에 위치 */
#subjectSelectBtn {
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    z-index: 10;
    padding: 14px 28px;
    font-size: 16px;
    min-width: 140px;
}

/* 과목 선택 텍스트 스타일 */
.subject-select-text {
    font-size: 24px;
    color: #1e293b;
    cursor: pointer;
    transition: color 0.2s ease;
    user-select: none;
    font-weight: bold;
}

.subject-select-text:hover {
    color: #667eea;
}

#subjectSelectBtn {
    font-size: 24px;
    font-weight: bold;
}

#subjectSelectText {
    font-weight: bold;
    font-size: 24px;
}


.timer {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    font-weight: 500;
    color: #64748b;
}

/* 헤더 타이머 표시 */
.timer-display {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    height: 40px;
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    border-radius: 10px;
    border: 1px solid rgba(0, 0, 0, 0.1);
    margin-right: 12px;
}

.timer-display .fas.fa-clock {
    font-size: 16px;
    color: #64748b;
    width: 18px;
    text-align: center;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.timer-display .timer-value {
    font-family: 'SF Mono', 'Monaco', 'Menlo', monospace;
    font-size: 16px;
    font-weight: 600;
    color: #1e293b;
    letter-spacing: 0.5px;
    min-width: 60px;
    text-align: center;
    background: transparent !important;
    padding: 0 !important;
    border-radius: 0 !important;
    box-shadow: none !important;
}

/* 다크모드 타이머 스타일 */
body.dark-mode .timer-display {
    background: rgba(32, 33, 37, 0.9);
    border-color: rgba(255, 255, 255, 0.1);
}

body.dark-mode .timer-display .fas.fa-clock {
    color: #94a3b8;
}

body.dark-mode .timer-display .timer-value {
    color: #ffffff !important;
    background: transparent !important;
}

.timer .num {
    font-family: 'SF Mono', 'Monaco', 'Menlo', monospace;
    font-size: 14px;
    font-weight: 600;
    color: #1e293b;
    letter-spacing: 0.5px;
    min-width: 80px;
    text-align: center;
    display: inline-block;
}

/* Main Content Area - 데스크탑 우선 */
.lx_app_realtime_caption {
    flex: 1;
    display: flex;
    flex-direction: column;
    padding: 24px 32px;
    width: 100%;
    max-width: 1600px;
    margin: 0 auto;
    box-sizing: border-box;
}

.app_header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    margin-bottom: 12px;
    flex-wrap: wrap;
}

.app_header-left {
    display: flex;
    align-items: center;
    gap: 10px;
    flex: 1;
}

.app_header-right {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-left: auto;
}

/* 숨겨진 언어 태그 버튼 영역 */
.hidden-languages-bar {
    display: none;
    align-items: center;
    gap: 10px;
    padding: 0;
}

.hidden-languages-bar:not(:empty) {
    display: flex;
}

/* 모바일: 언어 버튼들을 오른쪽 버튼들 하단에 배치 */
@media (max-width: 768px) {
    .lx_app_realtime_caption .app_header {
        flex-direction: column;
        align-items: flex-end;
        gap: 8px;
    }
    
    /* 오른쪽 버튼들을 위에 배치 */
    .lx_app_realtime_caption .app_header-right {
        order: 1;
        width: 100%;
        justify-content: center; /* 모바일에서 가운데 정렬 */
    }
    
    /* 모바일에서 버튼 크기 동일하게 하고 화면에 꽉 차게 */
    .lx_app_realtime_caption .app_header-right {
        gap: 8px; /* 버튼 간격 조정 */
        width: 100%;
    }
    
    /* .lang div도 동일한 크기로 */
    .lx_app_realtime_caption .app_header-right .lang {
        flex: 1 1 0;
        min-width: 0;
        display: flex;
    }
    
    .lx_app_realtime_caption .app_header-right .k-button,
    .lx_app_realtime_caption .app_header-right button,
    .lx_app_realtime_caption .app_header-right .lang .k-button,
    .lx_app_realtime_caption .app_header-right .lang button {
        min-width: 0;
        width: 100%;
        flex: 1 1 0; /* 동일한 크기로 균등 분배 */
        padding: 10px 8px;
        font-size: 13px;
        text-align: center;
        white-space: nowrap;
        box-sizing: border-box;
    }
    
    /* 언어 버튼 영역을 아래에 배치 */
    .lx_app_realtime_caption .app_header-left {
        order: 2;
        width: 100%;
        max-width: 100%;
        display: block; /* flex에서 block으로 변경하여 스크롤 가능하게 */
        overflow-x: auto;
        overflow-y: hidden;
        -webkit-overflow-scrolling: touch;
        scrollbar-width: thin; /* Firefox */
    }
    
    /* 모바일에서 스크롤바 숨기기 */
    .lx_app_realtime_caption .app_header-left::-webkit-scrollbar {
        display: none; /* 스크롤바 숨기기 */
    }
    
    .lx_app_realtime_caption .app_header-left {
        -ms-overflow-style: none; /* IE and Edge */
        scrollbar-width: none; /* Firefox */
    }
    
    .lx_app_realtime_caption .hidden-languages-bar:not(:empty) {
        display: flex;
        flex-wrap: nowrap;
        justify-content: flex-start;
        gap: 8px;
        padding: 4px 0;
        min-width: max-content; /* 내용물만큼 최소 너비 확보 - 스크롤을 위해 필요 */
        width: max-content; /* 내용물만큼만 너비 */
    }
    
    .lx_app_realtime_caption .hidden-languages-bar .language-tag-btn {
        flex-shrink: 0;
        white-space: nowrap;
        padding: 8px 14px;
        font-size: 13px;
        min-width: 50px;
    }
}

/* 언어 태그 버튼 - 깔끔하고 잘 보이는 스타일 */
.language-tag-btn {
    padding: 12px 20px;
    background: rgba(255, 255, 255, 0.95);
    border: 2px solid #4f46e5;
    border-radius: 12px;
    color: #4f46e5;
    font-size: 16px;
    font-weight: 700;
    font-family: 'SF Mono', 'Monaco', 'Menlo', monospace;
    letter-spacing: 1.2px;
    cursor: pointer;
    transition: all 0.2s ease;
    line-height: 1;
    min-width: 70px;
    text-align: center;
    box-shadow: 0 4px 12px rgba(79, 70, 229, 0.2);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.language-tag-btn:hover {
    background: #4f46e5;
    border-color: #4f46e5;
    color: #ffffff;
    box-shadow: 0 6px 16px rgba(79, 70, 229, 0.35);
    transform: translateY(-2px);
}

.language-tag-btn:active {
    transform: translateY(0);
    box-shadow: 0 3px 8px rgba(79, 70, 229, 0.3);
}

/* 재생 바 - Sora/Claude 스타일 (선택적) */
.playback-bar {
    display: none;
}

.playback-controls {
    display: flex;
    align-items: center;
    gap: 12px;
}

.playback-btn {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: rgba(0, 0, 0, 0.06);
    border: none;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    padding: 0;
}

.playback-btn:hover {
    background: rgba(0, 0, 0, 0.1);
    transform: scale(1.05);
}

.playback-icon {
    font-size: 14px;
    color: #1d1d1f;
    line-height: 1;
}

.playback-time {
    display: flex;
    align-items: center;
    gap: 4px;
    font-size: 13px;
    color: #6e6e73;
    font-family: 'SF Mono', 'Monaco', 'Menlo', monospace;
    min-width: 100px;
}

.time-separator {
    color: #d2d2d7;
}

.playback-seek {
    flex: 1;
    position: relative;
    height: 4px;
    background: rgba(0, 0, 0, 0.06);
    border-radius: 2px;
    cursor: pointer;
}

.seek-slider {
    width: 100%;
    height: 4px;
    -webkit-appearance: none;
    appearance: none;
    background: transparent;
    outline: none;
    position: absolute;
    top: 0;
    left: 0;
    z-index: 2;
    cursor: pointer;
}

.seek-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 12px;
    height: 12px;
    background: #0071e3;
    border-radius: 50%;
    cursor: pointer;
    transition: all 0.2s;
}

.seek-slider::-webkit-slider-thumb:hover {
    transform: scale(1.2);
    background: #0077ed;
}

.seek-slider::-moz-range-thumb {
    width: 12px;
    height: 12px;
    background: #0071e3;
    border-radius: 50%;
    cursor: pointer;
    border: none;
    transition: all 0.2s;
}

.seek-progress {
    position: absolute;
    top: 0;
    left: 0;
    height: 100%;
    background: #0071e3;
    border-radius: 2px;
    width: 0%;
    transition: width 0.1s linear;
    pointer-events: none;
}

.room-code-display-inline {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    border-radius: 10px;
    border: 1px solid rgba(0, 0, 0, 0.1);
}

.room-code-label {
    font-size: 13px;
    font-weight: 500;
    color: #64748b;
}

.room-code-text {
    font-size: 14px;
    font-weight: 700;
    color: #1e293b;
    letter-spacing: 2px;
    font-family: 'SF Mono', 'Monaco', 'Menlo', monospace;
}

.lang {
    display: flex;
    align-items: center;
    gap: 8px;
}

.lx-icon.lx-i-country {
    font-size: 18px;
    color: #666;
    display: inline-block;
    line-height: 1;
    vertical-align: middle;
}

.k-button {
    padding: 10px 20px;
    border: none;
    border-radius: 4px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    white-space: nowrap;
}

.k-button {
    border-radius: 10px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    font-weight: 500;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.k-button-solid-secondary {
    background: rgba(255, 255, 255, 0.9);
    color: #1e293b;
    border: 1px solid rgba(0, 0, 0, 0.1);
    height: 40px;
    min-height: 40px;
    padding: 8px 24px;
    font-size: 14px;
    font-weight: 600;
    border-radius: 12px;
    box-sizing: border-box;
}

.k-button-solid-secondary:hover,
.k-button-solid-secondary:active,
.k-button-solid-secondary:focus {
    background: rgba(255, 255, 255, 1);
    border-color: rgba(0, 0, 0, 0.15);
    outline: none;
}

.k-button-solid-primary {
    background: rgba(255, 255, 255, 0.9);
    color: #1e293b;
    border: 1px solid rgba(0, 0, 0, 0.1);
    box-shadow: none;
}

.k-button-solid-primary:hover,
.k-button-solid-primary:active,
.k-button-solid-primary:focus {
    background: rgba(255, 255, 255, 1);
    border-color: rgba(0, 0, 0, 0.15);
    outline: none;
}

.k-button-solid-primary.red {
    background: rgba(255, 255, 255, 0.9);
    color: #1e293b;
    border: 1px solid rgba(0, 0, 0, 0.1);
    box-shadow: none;
}

.k-button-solid-primary.red:hover,
.k-button-solid-primary.red:active,
.k-button-solid-primary.red:focus {
    background: rgba(255, 255, 255, 1);
    border-color: rgba(0, 0, 0, 0.15);
    outline: none;
}

.k-button-text {
    font-size: 14px;
}

.app_box {
    background-color: #fff;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.app_body {
    flex: 1;
    padding: 15px;
    margin-bottom: 10px;
    min-height: aapp_body app_boxuto;
    width: 100%;
    height: 50%;
    box-sizing: border-box;
    display: flex;
    flex-direction: column;
}

/* Q&A 알림 배지 */
.qa-toggle-btn-wrapper {
    position: relative;
}

.qa-notification-badge {
    position: absolute;
    top: -8px;
    right: -8px;
    background: #ef4444;
    color: #ffffff;
    border-radius: 50%;
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    font-weight: 600;
    line-height: 1;
    box-shadow: 0 2px 4px rgba(239, 68, 68, 0.3);
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.1);
    }
}

.qa-notification-badge:empty {
    display: none;
}

/* Q&A 슬라이드 패널 */
.qa-slide-panel {
    position: fixed;
    top: 0;
    right: -500px;
    width: 500px;
    height: 100vh;
    background: #ffffff;
    box-shadow: -2px 0 10px rgba(0, 0, 0, 0.1);
    z-index: 1000;
    transition: right 0.3s ease-in-out;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.qa-slide-panel.active {
    right: 0;
}

.qa-panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 24px;
    border-bottom: 1px solid rgba(0, 0, 0, 0.08);
    background: #ffffff;
    flex-shrink: 0;
}

.qa-panel-title {
    margin: 0;
    font-size: 18px;
    font-weight: 600;
    color: #1e293b;
}

.qa-panel-header-buttons {
    display: flex;
    align-items: center;
    gap: 12px;
}

.qa-mic-toggle-wrapper {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
}

.qa-mic-toggle-label {
    font-size: 13px;
    font-weight: 500;
    color: #ef4444;
    text-align: center;
    white-space: nowrap;
}

.qa-mic-toggle-btn {
    background: #ef4444;
    border: none;
    border-radius: 50%;
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.3s ease;
    color: #ffffff;
    padding: 0;
    box-shadow: 0 2px 8px rgba(239, 68, 68, 0.3);
}

.qa-mic-toggle-btn:hover {
    background: #dc2626;
    color: #ffffff;
    box-shadow: 0 4px 12px rgba(239, 68, 68, 0.4);
    transform: translateY(-1px);
}

.qa-mic-toggle-btn.active {
    background: #667eea;
    color: #ffffff;
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.3);
}

.qa-mic-toggle-btn.active:hover {
    background: #5568d3;
    box-shadow: 0 6px 16px rgba(102, 126, 234, 0.4);
    transform: translateY(-1px);
}

.qa-mic-toggle-btn svg {
    width: 22px;
    height: 22px;
    flex-shrink: 0;
    stroke: #ffffff;
    color: #ffffff;
}

.qa-mic-toggle-btn.active svg {
    stroke: #ffffff;
    color: #ffffff;
}

.qa-mic-toggle-wrapper:has(.qa-mic-toggle-btn.active) .qa-mic-toggle-label {
    color: #667eea;
}

.qa-mic-toggle-text {
    display: none;
}

.qa-panel-close-btn {
    background: none;
    border: none;
    font-size: 28px;
    color: #64748b;
    cursor: pointer;
    padding: 0;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 4px;
    transition: all 0.2s ease;
}

.qa-panel-close-btn:hover {
    background: rgba(0, 0, 0, 0.05);
    color: #1e293b;
}

.qa-panel-content {
    flex: 1;
    overflow-y: auto;
    padding: 0;
    display: flex;
    flex-direction: column;
}

.qa-chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 0; /* gap 제거, 개별 메시지의 margin으로 간격 조정 */
}

.qa-message {
    display: flex;
    flex-direction: column;
    max-width: 80%;
    animation: slideIn 0.3s ease-out;
    margin-top: 0; /* 기본값: 모든 메시지의 margin-top을 0으로 초기화 */
    margin-bottom: 0;
}

/* 같은 발신자의 연속된 메시지: 작은 간격으로 붙임 */
.qa-message.qa-message-grouped {
    margin-top: 8px !important;
}

/* 다른 발신자의 메시지: 큰 간격으로 구분 */
.qa-message.qa-message-new-group {
    margin-top: 20px !important;
}

/* 첫 번째 메시지는 위쪽 간격 없음 (모든 경우에 대해 강제 적용) */
.qa-chat-messages > .qa-message:first-child,
.qa-chat-messages > .qa-message:first-child.qa-message-grouped,
.qa-chat-messages > .qa-message:first-child.qa-message-new-group {
    margin-top: 0 !important;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 교수자 시점: 학생 질문은 왼쪽, 교수자 답변은 오른쪽 */
.qa-message.student {
    align-self: flex-start;
    align-items: flex-start;
}

.qa-message.professor {
    align-self: flex-end;
    align-items: flex-end;
}

.qa-message-bubble {
    padding: 12px 16px;
    border-radius: 18px;
    word-wrap: break-word;
    line-height: 1.5;
    font-size: 14px;
}

/* 학생 질문: 왼쪽, 회색 배경 */
.qa-message.student .qa-message-bubble {
    background: #f1f5f9;
    color: #1e293b;
    border-bottom-left-radius: 4px;
    border: 1px solid rgba(0, 0, 0, 0.05);
    display: flex;
    flex-direction: column;
}

/* 교수자 답변: 오른쪽, 파란색 배경 */
.qa-message.professor .qa-message-bubble {
    background: #667eea;
    color: #ffffff;
    border-bottom-right-radius: 4px;
    border: none;
    display: flex;
    flex-direction: column;
    box-shadow: 0 2px 4px rgba(102, 126, 234, 0.2);
}

.qa-bubble-text {
    margin-bottom: 8px;
}

.qa-message.professor .qa-bubble-text {
    color: #ffffff;
}

/* Q&A 텍스트 라인 스타일 */
.qa-text-line {
    display: flex;
    align-items: flex-start;
    gap: 8px;
    margin-bottom: 6px;
}

.qa-text-line:last-child {
    margin-bottom: 0;
}

.qa-language-label {
    font-size: 11px;
    font-weight: 600;
    color: #64748b;
    white-space: nowrap;
    flex-shrink: 0;
    padding-top: 2px;
}

.qa-message.professor .qa-language-label {
    color: rgba(255, 255, 255, 0.9);
}

.qa-text-content {
    flex: 1;
    word-wrap: break-word;
    line-height: 1.5;
}

.qa-text-original {
    font-weight: 500;
}

.qa-text-translated {
    font-weight: 400;
    opacity: 0.9;
}

.qa-message.professor .qa-text-translated {
    opacity: 1;
}


.qa-message-sender {
    font-size: 12px;
    font-weight: 500;
    margin-bottom: 4px;
    padding: 0 4px;
}

.qa-message.student .qa-message-sender {
    color: #64748b;
}

.qa-message.professor .qa-message-sender {
    color: #ffffff;
    font-weight: 600;
}

.qa-message-time {
    font-size: 11px;
    color: #64748b !important;
    margin-top: 4px;
    padding: 0 4px;
    display: block !important;
    white-space: nowrap;
    visibility: visible !important;
    opacity: 1 !important;
    line-height: 1.2;
    min-height: 14px;
}

.qa-message.student .qa-message-time {
    color: #64748b !important;
    text-align: left;
}

.qa-message.professor .qa-message-time {
    color: #64748b !important;
    text-align: right;
}

/* 원문보기 버튼 (학생 질문 박스 안 하단) */
.qa-message.student .qa-original-btn {
    margin-top: 8px;
    padding: 6px 12px;
    background: rgba(255, 255, 255, 0.8);
    border: 1px solid rgba(0, 0, 0, 0.1);
    border-radius: 8px;
    font-size: 12px;
    color: #64748b;
    cursor: pointer;
    transition: all 0.2s ease;
    align-self: flex-start;
    width: auto;
}

.qa-message.student .qa-original-btn:hover {
    background: rgba(255, 255, 255, 1);
    color: #1e293b;
    border-color: rgba(0, 0, 0, 0.2);
}

/* 원문보기 버튼 (교수자 답변 박스 안 하단) */
.qa-message.professor .qa-original-btn {
    margin-top: 8px;
    padding: 6px 12px;
    background: rgba(255, 255, 255, 0.2);
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: 8px;
    font-size: 12px;
    color: #ffffff;
    cursor: pointer;
    transition: all 0.2s ease;
    align-self: flex-end;
    width: auto;
}

.qa-message.professor .qa-original-btn:hover {
    background: rgba(255, 255, 255, 0.3);
    color: #ffffff;
    border-color: rgba(255, 255, 255, 0.4);
}

/* 원문 텍스트 (학생 질문 박스 안) */
.qa-message.student .qa-original-text {
    margin-top: 8px;
    padding: 0 14px;
    background: transparent;
    border-radius: 8px;
    font-size: 13px;
    color: #475569;
    border: none;
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    transition: max-height 0.3s ease-in-out, opacity 0.3s ease-in-out, padding 0.3s ease-in-out, margin-top 0.3s ease-in-out;
}

.qa-message.student .qa-original-text.show {
    max-height: 500px;
    opacity: 1;
    padding: 10px 14px;
    margin-top: 8px;
}

/* 원문 텍스트 (교수자 답변 박스 안) */
.qa-message.professor .qa-original-text {
    margin-top: 8px;
    padding: 0 14px;
    background: transparent;
    border-radius: 8px;
    font-size: 13px;
    color: rgba(255, 255, 255, 0.9);
    border: none;
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    transition: max-height 0.3s ease-in-out, opacity 0.3s ease-in-out, padding 0.3s ease-in-out, margin-top 0.3s ease-in-out;
}

.qa-message.professor .qa-original-text.show {
    max-height: 500px;
    opacity: 1;
    padding: 10px 14px;
    margin-top: 8px;
    background: rgba(255, 255, 255, 0.1);
}

/* 번역된 텍스트 (교수자 답변의 한국어 원문) */
.qa-translated-text {
    margin-top: 8px;
    padding: 10px 14px;
    background: rgba(102, 126, 234, 0.1);
    border-radius: 8px;
    font-size: 13px;
    color: #1e293b;
    border-left: 3px solid #667eea;
    font-style: italic;
}

.qa-panel-footer {
    padding: 16px 20px;
    border-top: 1px solid rgba(0, 0, 0, 0.08);
    background: #ffffff;
    flex-shrink: 0;
}

.qa-input-container {
    display: flex;
    align-items: center;
    gap: 12px;
}

.qa-input {
    flex: 1;
    padding: 12px 16px;
    border: 1px solid rgba(0, 0, 0, 0.1);
    border-radius: 24px;
    font-size: 14px;
    outline: none;
    transition: all 0.2s ease;
}

.qa-input:focus {
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.qa-send-btn {
    padding: 12px 24px;
    background: #667eea;
    color: #ffffff;
    border: none;
    border-radius: 24px;
    font-size: 18px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}

.qa-send-btn:hover {
    background: #5568d3;
    transform: translateY(-1px);
    box-shadow: 0 4px 8px rgba(102, 126, 234, 0.3);
}

.qa-send-btn:active {
    transform: translateY(0);
}

.qa-voice-btn {
    background: #667eea;
    border: none;
    border-radius: 50%;
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 2px 8px rgba(102, 126, 234, 0.3);
    flex-shrink: 0;
}

.qa-voice-btn:hover {
    background: #5568d3;
    transform: scale(1.05);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.4);
}

.qa-voice-btn:active {
    transform: scale(0.95);
}

.qa-voice-btn.listening {
    background: #ef4444 !important;
    animation: pulse-recording 1.5s ease-in-out infinite;
}

@keyframes pulse-recording {
    0%, 100% {
        box-shadow: 0 0 0 0 rgba(239, 68, 68, 0.7);
    }
    50% {
        box-shadow: 0 0 0 10px rgba(239, 68, 68, 0);
    }
}

.qa-voice-btn-icon {
    width: 24px;
    height: 24px;
    object-fit: contain;
    filter: brightness(0) invert(1); /* 이미지를 흰색으로 변환 */
}

.qa-slide-panel .cp_trans {
    display: grid;
    gap: 20px;
    width: 100%;
    padding: 0;
    box-sizing: border-box;
    min-height: auto;
    grid-template-columns: 1fr !important;
}

/* Q&A 패널 배경 오버레이 */
.qa-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.3);
    z-index: 999;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease-in-out, visibility 0.3s ease-in-out;
}

.qa-overlay.active {
    opacity: 1;
    visibility: visible;
}

/* 모바일 반응형 */
@media (max-width: 768px) {
    .qa-slide-panel {
        width: 100%;
        right: -100%;
    }
    
    .qa-panel-header {
        padding: 16px 20px;
    }
    
    .qa-panel-title {
        font-size: 16px;
    }
    
    .qa-mic-toggle-btn {
        width: 44px;
        height: 44px;
        padding: 0;
    }
    
    .qa-mic-toggle-btn svg {
        width: 22px;
        height: 22px;
    }
    
    .qa-mic-toggle-text {
        display: none;
    }
    
    .qa-chat-messages {
        padding: 16px;
    }
    
    .qa-message {
        max-width: 85%;
    }
    
    .qa-panel-footer {
        padding: 12px 16px;
    }
    
    .qa-input-container {
        gap: 8px;
    }
    
    .qa-input {
        padding: 10px 14px;
        font-size: 13px;
    }
    
    .qa-send-btn {
        padding: 10px 20px;
        font-size: 16px;
    }
    
    .qa-voice-btn {
        width: 44px;
        height: 44px;
    }
    
    .qa-voice-btn-icon {
        width: 20px;
        height: 20px;
    }
}

/* PC 기반 Grid 레이아웃 - 동적 열 구조 */
.cp_trans {
    display: grid;
    gap: 20px;
    width: 100%;
    padding: 0;
    box-sizing: border-box;
    min-height: 600px;
}

/* 선택된 언어 개수에 따른 Grid 열 설정 */
.cp_trans.grid-1 {
    grid-template-columns: 1fr;
    max-width: 800px;
    margin: 0 auto;
}

.cp_trans.grid-2 {
    grid-template-columns: repeat(2, 1fr);
}

.cp_trans.grid-3 {
    grid-template-columns: repeat(3, 1fr);
}

.cp_trans.grid-4 {
    grid-template-columns: repeat(4, 1fr);
}

/* 태블릿: 2열 (최대) */
@media (max-width: 1200px) {
    .cp_trans.grid-3,
    .cp_trans.grid-4 {
        grid-template-columns: repeat(2, 1fr);
    }
    .cp_trans {
        gap: 16px;
    }
}

/* 모바일: 1열 */
@media (max-width: 768px) {
    .cp_trans {
        grid-template-columns: 1fr !important;
        gap: 12px;
    }
}

/* 언어 패널 컨테이너 - 전문적인 데스크탑 UI */
.cp_cols_container {
    display: flex;
    flex-direction: column;
    height: 600px;
    width: 100%;
    min-height: 0;
    overflow: hidden;
    border-radius: 16px;
}

.cp_cols_container.hidden {
    display: none;
}

/* 숨겨진 컬럼 - 완전히 제거 (애니메이션 없음) */
.cp_cols_container.hidden-column {
    display: none !important;
}

/* Real-time Caption 박스 오른쪽 버튼 */
.caption-right-btn {
    width: 40px;
    height: 100%;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    transition: all 0.3s ease;
}

.caption-right-btn-inner {
    width: 32px;
    height: 60px;
    background: linear-gradient(135deg, #4f46e5 0%, #6366f1 100%);
    border-radius: 0 12px 12px 0;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 2px 0 8px rgba(79, 70, 229, 0.25);
    transition: all 0.3s ease;
}

.caption-right-btn:hover .caption-right-btn-inner {
    background: linear-gradient(135deg, #4338ca 0%, #5b21b6 100%);
    box-shadow: 2px 0 12px rgba(79, 70, 229, 0.35);
}

.caption-right-icon {
    color: #fff;
    font-size: 14px;
    font-weight: bold;
    user-select: none;
    line-height: 1;
}

/* 언어 패널 카드 - 전문적인 데스크탑 UI */
.cp_cols {
    background: #ffffff;
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-radius: 18px;
    padding: 0;
    height: 100%;
    display: flex;
    flex-direction: column;
    background-clip: padding-box;
    overflow: hidden;
    width: 100%;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1),
                inset 0 1px 0 rgba(255, 255, 255, 0.9);
    border: 1px solid rgba(0, 0, 0, 0.1);
    box-sizing: border-box;
    position: relative;
}

/* 번역 컨테이너 - 파란색 계열 */
[data-panel-type="output"] .cp_cols {
    background: rgba(219, 234, 254, 0.95);
    border: 1px solid rgba(59, 130, 246, 0.3);
}

/* 패널 헤더 - 전문적인 데스크탑 UI */
.cp_title_wrapper {
    position: sticky;
    top: 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-shrink: 0;
    padding: 16px 20px;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(12px) saturate(180%);
    -webkit-backdrop-filter: blur(12px) saturate(180%);
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
    z-index: 20;
    margin: 0;
    gap: 12px;
    user-select: none;
}

/* 번역 컨테이너 헤더 */
[data-panel-type="output"] .cp_title_wrapper {
    background: rgba(219, 234, 254, 0.9);
    border-bottom: 1px solid rgba(59, 130, 246, 0.2);
}

/* 닫기 버튼 - 전문적인 스타일 */
.column-close-btn {
    width: 24px;
    height: 24px;
    border: none;
    background: rgba(0, 0, 0, 0.05);
    border: 1px solid rgba(0, 0, 0, 0.1);
    border-radius: 4px;
    color: #64748b;
    font-size: 12px;
    line-height: 1;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0;
    flex-shrink: 0;
    font-weight: 400;
}

.column-close-btn img {
    width: 16px;
    height: 16px;
    object-fit: contain;
    display: block;
}

.column-close-btn:hover {
    background: rgba(0, 0, 0, 0.08);
    border-color: rgba(0, 0, 0, 0.15);
    color: #1e293b;
}

.cp_title_info {
    display: flex;
    flex-direction: column;
    gap: 4px;
    flex: 1;
}

.cp_title {
    font-size: 15px;
    font-weight: 600;
    color: #1e293b;
    margin: 0;
    padding: 0;
    display: flex;
    align-items: center;
    gap: 8px;
    letter-spacing: -0.2px;
}

.cp_title_badge {
    display: inline-block;
    padding: 6px 14px;
    background: linear-gradient(135deg, #4f46e5 0%, #6366f1 100%);
    border-radius: 8px;
    font-size: 13px;
    font-weight: 700;
    color: #ffffff;
    text-transform: uppercase;
    letter-spacing: 0.8px;
    box-shadow: 0 2px 8px rgba(79, 70, 229, 0.2);
}

.cp_subtitle {
    font-size: 14px;
    font-weight: 400;
    color: #64748b;
    margin: 0;
    padding: 0;
}

/* title_info 스타일 */
.cp_title_info {
    flex: 1;
}

.cp_cols .cp_title {
    flex-shrink: 0;
    margin: 0;
    flex: 1;
}

/* 닫기 버튼 - 제거 (아코디언으로 대체) */
.caption-close-btn {
    display: none;
}

.caption-close-icon {
    line-height: 1;
    user-select: none;
    font-weight: 300;
}

/* 열림 버튼 (Translated 왼쪽) */
.caption-open-btn {
    width: 28px;
    height: 28px;
    background: rgba(0, 0, 0, 0.05);
    border: 1px solid rgba(0, 0, 0, 0.1);
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.3s ease;
    padding: 0;
    color: #1e293b;
    font-size: 16px;
    flex-shrink: 0;
}

.caption-open-btn:hover {
    background: rgba(0, 0, 0, 0.08);
    border-color: rgba(0, 0, 0, 0.15);
    transform: scale(1.1);
}

.caption-open-icon {
    line-height: 1;
    user-select: none;
    font-weight: normal;
}

/* 패널 내용 영역 */
.cp_cols_content {
    overflow: hidden;
}

.caption-toggle-btn {
    background: linear-gradient(135deg, #4f46e5 0%, #6366f1 100%);
    border: 2px dashed transparent;
    border-radius: 8px;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.3s ease;
    padding: 0;
    color: #fff;
    font-size: 16px;
    box-shadow: 0 2px 8px rgba(79, 70, 229, 0.25);
    position: relative;
}

.caption-toggle-btn:hover {
    transform: scale(1.05);
    box-shadow: 0 4px 12px rgba(139, 92, 246, 0.4);
}

.caption-toggle-btn:active {
    transform: scale(0.98);
}

.caption-toggle-btn:focus {
    outline: none;
    border: 2px dashed #ef4444;
}

/* 오른쪽 끝 세로 그라데이션 막대 버튼 */
.cp_trans {
    position: relative;
}

.caption-side-toggle-btn-right {
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 32px;
    height: 60px;
    background: transparent;
    border: none;
    cursor: pointer;
    z-index: 100;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Real-time Caption이 열려있을 때 버튼 위치 */
.cp_trans:not(.hide-caption) .caption-side-toggle-btn-right {
    left: calc(33.333% - 32px);
}

/* Real-time Caption이 닫혀있을 때 버튼 위치 */
.cp_trans.hide-caption .caption-side-toggle-btn-right {
    left: 0;
}

.caption-side-bar-right {
    width: 32px;
    height: 60px;
    background: linear-gradient(135deg, #4f46e5 0%, #6366f1 100%);
    border-radius: 0 12px 12px 0;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 2px 0 8px rgba(79, 70, 229, 0.25);
    transition: all 0.3s ease;
    position: relative;
}

.caption-side-toggle-btn-right:hover .caption-side-bar-right {
    box-shadow: 2px 0 12px rgba(79, 70, 229, 0.35);
    background: linear-gradient(135deg, #4338ca 0%, #5b21b6 100%);
}

.caption-side-icon-right {
    color: #fff;
    font-size: 16px;
    font-weight: bold;
    user-select: none;
    transition: transform 0.3s ease;
}

.caption-side-toggle-btn-right:hover .caption-side-icon-right {
    transform: scale(1.2);
}

.caption-toggle-icon {
    display: inline-block;
    transition: all 0.3s ease;
    font-size: 18px;
    line-height: 1;
    user-select: none;
    font-weight: bold;
}

/* 패널 내용 영역 - 전문적인 데스크탑 UI (애니메이션 없음) */
.cp_cols_content {
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
    min-height: 0;
    padding: 20px;
    -webkit-overflow-scrolling: touch;
    display: flex;
    flex-direction: column;
    gap: 4px;
    background: transparent;
}

/* Glassmorphism 스크롤바 */
.cp_cols_content::-webkit-scrollbar {
    width: 8px;
}

.cp_cols_content::-webkit-scrollbar-track {
    background: rgba(0, 0, 0, 0.05);
    border-radius: 4px;
}

.cp_cols_content::-webkit-scrollbar-thumb {
    background: rgba(0, 0, 0, 0.2);
    border-radius: 4px;
}

.cp_cols_content::-webkit-scrollbar-thumb:hover {
    background: rgba(0, 0, 0, 0.3);
}

/* 텍스트 블록 - 한 문장마다 한 박스 */
.text-block {
    padding: 12px 24px 12px 24px;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(10px);
    border-radius: 12px;
    border: 1px solid rgba(0, 0, 0, 0.08);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 0;
    /*  FOUC 방지: background transition 제거 */
    transition: opacity 0.3s ease, transform 0.3s ease, border-color 0.2s ease;
    width: 100%;
    min-height: auto;
    height: auto;
    margin-bottom: 4px;
    box-sizing: border-box;
    overflow: visible;
    flex-shrink: 0;
    position: relative;
    opacity: 0;
    transform: translateY(10px);
}

/* 스크롤이 필요한 경우 위에서부터 정렬 */
.text-block.scrollable {
    justify-content: flex-start;
}

.text-block:hover {
    background: rgba(255, 255, 255, 0.95);
    border-color: rgba(0, 0, 0, 0.12);
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.text-block-label {
    display: none;
}

.text-block-content {
    font-size: 15px;
    line-height: 1.8;
    color: #1e293b;
    font-weight: 400;
    margin: 0;
    padding: 0;
    position: relative;
    z-index: 1;
    white-space: pre-wrap;
    word-wrap: break-word;
    word-break: break-word;
    overflow-wrap: break-word;
    text-align: left;
    width: 100%;
    max-width: 100%;
    box-sizing: border-box;
    border-radius: inherit;
    overflow: visible;
}

/* 폰트 사이즈 클래스 */
.text-block-content.font-size-small,
.cp_cols_content.font-size-small .text-block-content {
    font-size: 13px;
    line-height: 1.8;
}

.text-block-content.font-size-medium,
.cp_cols_content.font-size-medium .text-block-content {
    font-size: 26px;
    line-height: 1.8;
}

.text-block-content.font-size-large,
.cp_cols_content.font-size-large .text-block-content {
    font-size: 39px;
    line-height: 1.8;
}

/* 폰트 사이즈별 텍스트 블록 최소 높이 */
.cp_cols_content.font-size-small .text-block {
    min-height: 50px;
}

.cp_cols_content.font-size-medium .text-block {
    min-height: 80px;
}

.cp_cols_content.font-size-large .text-block {
    min-height: 120px;
}

/* 폰트 사이즈 컨트롤 버튼 (언어 설정 왼쪽) */
.font-size-control {
    position: relative;
    display: flex;
    align-items: center;
    gap: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    padding: 0;
    border-radius: 12px;
    border: 1px solid rgba(0, 0, 0, 0.1);
    margin-right: 8px;
    overflow: hidden;
}

.font-size-controls {
    display: flex;
    gap: 0;
}

.font-size-btn {
    padding: 8px 16px;
    background: white;
    border: none;
    border-radius: 0;
    color: #374151;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    text-align: center;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    min-width: 70px;
    height: 40px;
    box-sizing: border-box;
    position: relative;
}

.font-size-btn:not(:last-child) {
    border-right: 1px solid #E5E7EB;
}

.font-size-btn .arrow-indicator {
    position: absolute;
    top: 4px;
    right: 6px;
    font-size: 8px;
    opacity: 0.7;
}

.font-size-btn:first-child {
    border-radius: 8px 0 0 8px;
}

.font-size-btn:last-child {
    border-radius: 0 8px 8px 0;
}

.font-size-btn i {
    font-size: 14px;
}

.font-size-btn span {
    font-size: 14px;
    font-weight: 600;
}

#font-size-increase span {
    font-size: 16px;
}

#font-size-decrease span {
    font-size: 12px;
}

.font-size-btn:hover {
    background: #F9FAFB;
}

.font-size-btn:focus,
.font-size-btn:active,
.font-size-btn:focus-visible,
.font-size-btn.active {
    outline: none !important;
    background: white !important;
    box-shadow: none !important;
}

/* 다크 모드 - 폰트 사이즈 버튼 */
body.dark-mode .font-size-control {
    background: rgba(31, 41, 55, 0.95);
    border-color: rgba(255, 255, 255, 0.1);
}

body.dark-mode .font-size-btn {
    background: #1F2937;
    border: none;
    color: #E5E7EB;
}

body.dark-mode .font-size-btn:not(:last-child) {
    border-right: 1px solid rgba(255, 255, 255, 0.1);
}

body.dark-mode .font-size-btn:hover {
    background: #374151;
}

body.dark-mode .font-size-btn:focus,
body.dark-mode .font-size-btn:active,
body.dark-mode .font-size-btn:focus-visible,
body.dark-mode .font-size-btn.active {
    outline: none !important;
    background-color: #1F2937 !important;
    box-shadow: none !important;
    border: none !important;
}

/* 모바일 반응형 */
@media (max-width: 768px) {
    .font-size-control {
        margin-right: 6px;
    }
    
    .font-size-btn {
        min-width: 60px;
        height: 32px;
        padding: 6px 12px;
        font-size: 12px;
    }
    
    .font-size-btn span {
        font-size: 12px;
    }
    
    #font-size-increase span {
        font-size: 14px;
    }
    
    #font-size-decrease span {
        font-size: 10px;
    }
}

/* 타이핑 중인 텍스트 블록에 커서 표시 */
.text-block.typing .text-block-content::after {
    content: '|';
    color: #667eea;
    animation: blink 1s infinite;
    margin-left: 2px;
    font-weight: bold;
}

@keyframes blink {
    0%, 50% {
        opacity: 1;
    }
    51%, 100% {
        opacity: 0;
    }
}

/* 기존 스타일 제거 - 새로운 구조 사용 */
.translated-text-line,
.realtime-text-line {
    display: none;
}

.translation-item {
    display: none;
}

.cp_title {
    font-size: 15px;
    font-weight: 600;
    color: #1e293b;
    margin: 0;
    padding: 0;
    border: none;
    text-align: left;
    font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', sans-serif;
    letter-spacing: -0.2px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.cp_title::before {
    content: '';
    width: 4px;
    height: 16px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 2px;
}

#cp_title_2 {
    border-bottom: none;
}


.cp_card {
    margin-bottom: 15px;
    padding: 15px;
    background-color: #fff;
    border-radius: 4px;
    border: 1px solid #e0e0e0;
}

.cp_card .desc {
    font-size: 14px;
    color: #333;
    line-height: 1.6;
}

.app_menu {
    padding: 25px 30px;
    text-align: center;
    background-color: #f8fafc;
    border-radius: 8px;
}

.mic_text {
    font-size: 20px;
    color: #1e293b;
    font-weight: 600;
    padding: 15px;
    background-color: #fff;
    border-radius: 8px;
    border: 2px solid #e2e8f0;
}

.mic_text p {
    margin: 0;
}

/* 반응형 디자인 - Desktop-First */
@media (max-width: 1200px) {
    .lx_app_realtime_caption {
        padding: 24px;
    }
    
    .cp_cols_container {
        height: 450px;
    }
}

@media (max-width: 768px) {
    .lx_app_realtime_caption {
        padding: 16px;
    }
    
    .cp_cols_container {
        height: 400px;
    }
    
    .lx_app_header {
        padding: 12px 20px;
        flex-direction: column;
        align-items: flex-start;
        gap: 12px;
    }
    
    .menu {
        width: 100%;
        justify-content: space-between;
    }
}

/* 과목 선택 모달 - Sora/Claude 스타일 */
.modal-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    z-index: 1000;
    justify-content: center;
    align-items: center;
}

.modal-overlay.active {
    display: flex;
}

.modal-content {
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-radius: 18px;
    width: 90%;
    max-width: 600px;
    max-height: 80vh;
    overflow-y: auto;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.15),
                inset 0 1px 0 rgba(255, 255, 255, 0.9);
    border: 1px solid rgba(0, 0, 0, 0.1);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 24px 30px;
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
}

/* 과목 선택 모달: X 버튼 숨기고 제목 가운데 정렬 */
#subjectModal .modal-header {
    justify-content: center;
}

#subjectModal .modal-close {
    display: none;
}

/* 과목 선택 모달: 스크롤을 모달 내부로 이동 */
#subjectModal .modal-content {
    overflow-y: hidden; /* 모달 전체 스크롤 제거 */
    display: flex;
    flex-direction: column;
    max-height: 80vh;
}

#subjectModal .modal-body {
    overflow-y: auto;
    overflow-x: hidden;
    -webkit-overflow-scrolling: touch;
    flex: 1;
    min-height: 0; /* flex 아이템이 축소 가능하도록 */
}

/* 언어 설정 단계가 표시될 때는 modal-body 스크롤 제거 */
#subjectModal .modal-body.language-step-active {
    overflow-y: hidden;
}

/* 과목 선택 모달 스크롤바 스타일 - 배경 없애기 */
#subjectModal .modal-body::-webkit-scrollbar {
    width: 6px;
}

#subjectModal .modal-body::-webkit-scrollbar-track {
    background: transparent; /* 배경 없애기 */
}

#subjectModal .modal-body::-webkit-scrollbar-thumb {
    background-color: rgba(0, 0, 0, 0.2);
    border-radius: 3px;
}

#subjectModal .modal-body::-webkit-scrollbar-thumb:hover {
    background-color: rgba(0, 0, 0, 0.3);
}

/* Firefox */
#subjectModal .modal-body {
    scrollbar-width: thin;
    scrollbar-color: rgba(0, 0, 0, 0.2) transparent;
}

.modal-header h2 {
    font-size: 22px;
    font-weight: 600;
    color: #1e293b;
    margin: 0;
    letter-spacing: -0.3px;
}

.modal-close {
    background: rgba(0, 0, 0, 0.05);
    border: 1px solid rgba(0, 0, 0, 0.1);
    border-radius: 8px;
    font-size: 20px;
    color: #64748b;
    cursor: pointer;
    padding: 0;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    line-height: 1;
    transition: all 0.3s ease;
}

.modal-close:hover {
    background: rgba(0, 0, 0, 0.08);
    border-color: rgba(0, 0, 0, 0.15);
    color: #1e293b;
    transform: scale(1.1);
}

.modal-body {
    padding: 30px;
    position: relative;
    min-height: 300px;
}

.modal-step {
    animation: fadeIn 0.3s ease-in;
}

/* 언어 설정 단계: flexbox 레이아웃으로 변경하여 버튼 하단 고정 */
#languageStep {
    display: flex;
    flex-direction: column;
    height: 100%;
    min-height: 0;
}

#languageStep .language-popup-header {
    flex-shrink: 0;
}

#languageStep .language-options {
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
    min-height: 0;
    margin: 16px 0 0 0;
    /* 스크롤바 스타일 */
    scrollbar-width: thin;
    scrollbar-color: rgba(0, 0, 0, 0.2) transparent;
}

#languageStep .language-options::-webkit-scrollbar {
    width: 6px;
}

#languageStep .language-options::-webkit-scrollbar-track {
    background: transparent;
}

#languageStep .language-options::-webkit-scrollbar-thumb {
    background-color: rgba(0, 0, 0, 0.2);
    border-radius: 3px;
}

#languageStep .language-options::-webkit-scrollbar-thumb:hover {
    background-color: rgba(0, 0, 0, 0.3);
}

#languageStep .modal-step-footer {
    flex-shrink: 0;
    margin-top: 16px;
    padding-top: 12px;
    border-top: 1px solid rgba(0, 0, 0, 0.05);
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateX(10px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.modal-step-footer {
    margin-top: 30px;
    display: flex;
    gap: 12px;
    justify-content: center; /* 가운데 정렬 */
}

.modal-step-footer .language-popup-btn {
    padding: 12px 24px;
    border-radius: 10px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    min-width: 100px;
    border: none;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.modal-step-footer .language-popup-btn-save {
    background: linear-gradient(135deg, #4f46e5 0%, #6366f1 100%);
    color: white;
    box-shadow: 0 4px 12px rgba(79, 70, 229, 0.25);
}

.modal-step-footer .language-popup-btn-save:hover {
    box-shadow: 0 6px 20px rgba(79, 70, 229, 0.35);
    background: linear-gradient(135deg, #4338ca 0%, #5b21b6 100%);
}

.modal-step-footer .language-popup-btn-cancel {
    background: rgba(0, 0, 0, 0.05);
    color: #64748b;
    border: 1px solid rgba(0, 0, 0, 0.1);
}

.modal-step-footer .language-popup-btn-cancel:hover {
    background: rgba(0, 0, 0, 0.08);
    border-color: rgba(0, 0, 0, 0.15);
    color: #1e293b;
}

.modal-description {
    font-size: 15px;
    color: #64748b;
    margin-bottom: 24px;
    line-height: 1.6;
}

/* 교과/비교과 탭 스타일 */
.subject-tabs {
    display: flex;
    gap: 8px;
    margin-top: -20px; /* 더 위로 올리기 */
    margin-bottom: 20px;
    border-bottom: 2px solid rgba(0, 0, 0, 0.1);
    padding-bottom: 0;
}

.subject-tab {
    padding: 12px 24px;
    background: transparent;
    border: none;
    border-bottom: 3px solid transparent;
    color: #64748b;
    font-size: 15px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    margin-bottom: -2px;
    position: relative;
    
}

.subject-tab:hover {
    color: #1e293b;
    background: rgba(0, 0, 0, 0.02);
}

.subject-tab.active {
    color: #4f46e5;
    border-bottom-color: #4f46e5;
    font-weight: 600;
}

.subject-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.subject-item {
    padding: 20px;
    border: 1px solid rgba(0, 0, 0, 0.1);
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(10px);
}

.subject-item:hover {
    border-color: rgba(102, 126, 234, 0.5);
    background: rgba(102, 126, 234, 0.1);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.2);
}

.subject-item.selected {
    border-color: rgba(102, 126, 234, 0.6);
    background: rgba(102, 126, 234, 0.15);
    box-shadow: 0 4px 16px rgba(102, 126, 234, 0.3);
}

.subject-item .subject-name {
    font-size: 17px;
    font-weight: 600;
    color: #1e293b;
    margin-bottom: 8px;
    letter-spacing: -0.2px;
}

.subject-item .subject-code {
    font-size: 13px;
    color: #64748b;
}

/* 버튼 비활성화 상태 */
.k-button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.k-button:disabled:hover {
    background-color: #4682B4;
}

/* Room Code 모달 - Sora/Claude 스타일 */
.room-code-popup {
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-radius: 18px;
    padding: 40px;
    text-align: center;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.15),
                inset 0 1px 0 rgba(255, 255, 255, 0.9);
    max-width: 450px;
    width: 90%;
    border: 1px solid rgba(0, 0, 0, 0.1);
    animation: slideUp 0.4s ease-out;
}

.room-code-title {
    font-size: 22px;
    font-weight: 600;
    color: #1e293b;
    margin: 0 0 30px 0;
    text-align: center;
    letter-spacing: -0.3px;
}

.room-code-display {
    background: linear-gradient(135deg, #4f46e5 0%, #6366f1 100%);
    border-radius: 12px;
    padding: 30px 40px;
    margin: 0 0 20px 0;
    box-shadow: 0 4px 12px rgba(79, 70, 229, 0.25);
}

.room-code-display .code-text {
    font-size: 48px;
    font-weight: 700;
    color: #fff;
    letter-spacing: 4px;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
    margin: 0;
}

.room-code-instruction {
    font-size: 14px;
    color: #64748b;
    margin: 0 0 30px 0;
    text-align: center;
}

.room-code-close-btn {
    padding: 12px 32px;
    background: linear-gradient(135deg, #4f46e5 0%, #6366f1 100%);
    color: #fff;
    border: none;
    border-radius: 10px;
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 4px 12px rgba(79, 70, 229, 0.25);
}

.room-code-close-btn:hover {
    background: linear-gradient(135deg, #4338ca 0%, #5b21b6 100%);
    box-shadow: 0 6px 20px rgba(79, 70, 229, 0.35);
    transform: translateY(-1px);
}

/* Language Settings 모달 - 새 디자인 */
@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.language-popup {
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-radius: 18px;
    padding: 32px 40px 32px 40px; /* 스크롤바 영역만큼 좌우 패딩을 동일하게 설정하여 대칭 유지 */
    text-align: center;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.15),
                inset 0 1px 0 rgba(255, 255, 255, 0.9);
    max-width: 500px;
    width: 90%;
    max-height: 85vh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    border: 1px solid rgba(0, 0, 0, 0.1);
    animation: slideUp 0.4s ease-out;
}


.language-popup-header {
    margin-bottom: 24px;
    position: relative;
    flex-shrink: 0;
}

.language-icon-circle {
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, #4f46e5 0%, #6366f1 100%);
    border-radius: 50%;
    margin: 0 auto 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: none;
}

.language-icon-emoji {
    color: white;
    font-size: 20px;
}

.language-popup-title {
    margin: 0 0 8px 0;
    color: #1e293b;
    font-size: 22px;
    font-weight: 700;
    letter-spacing: -0.3px;
}

.language-popup-subtitle {
    margin: 0;
    color: #64748b;
    font-size: 14px;
    font-weight: 400;
}

.language-modal-close-btn {
    position: absolute;
    top: 0;
    right: 0;
    background: none;
    border: none;
    font-size: 32px;
    color: #64748b;
    cursor: pointer;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 8px;
    transition: all 0.2s ease;
    padding: 0;
    line-height: 1;
}

.language-modal-close-btn:hover {
    background-color: transparent;
    color: #64748b;
}

.language-modal-close-btn:active {
    background-color: transparent;
}

.language-options {
    margin: 16px 0 0 0;
    text-align: left;
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
    min-height: 0;
    /* 스크롤바 스타일 - 배경 없애기 */
    scrollbar-width: thin;
    scrollbar-color: rgba(0, 0, 0, 0.2) transparent;
}

.language-options::-webkit-scrollbar {
    width: 6px;
}

.language-options::-webkit-scrollbar-track {
    background: transparent;
}

.language-options::-webkit-scrollbar-thumb {
    background-color: rgba(0, 0, 0, 0.2);
    border-radius: 3px;
}

.language-options::-webkit-scrollbar-thumb:hover {
    background-color: rgba(0, 0, 0, 0.3);
}

.language-section {
    margin-bottom: 20px;
    background: #f8f9fa;
    border-radius: 8px;
    padding: 16px;
}

.language-section:last-child {
    margin-bottom: 0;
}

.language-section-label {
    display: block;
    font-weight: 600;
    color: #1e293b;
    margin-bottom: 8px;
    font-size: 14px;
}

.language-input-wrapper {
    position: relative;
}

.language-popup-select {
    width: 100%;
    padding: 12px 16px;
    border-radius: 10px;
    border: 1px solid rgba(0, 0, 0, 0.1);
    font-size: 15px;
    height: 48px;
    background: #ffffff;
    color: #1e293b;
    cursor: pointer;
    transition: all 0.3s ease;
    appearance: none;
    -webkit-appearance: none;
    -moz-appearance: none;
    box-sizing: border-box;
}

.language-popup-select:focus {
    outline: none;
    border-color: rgba(0, 0, 0, 0.2);
    background: #ffffff;
}

.language-popup-select:hover {
    border-color: rgba(0, 0, 0, 0.15);
    background: #ffffff;
}

.output-languages-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    grid-template-rows: repeat(2, 1fr);
    gap: 14px; /* 간격을 조금 늘림 */
}

/* 모바일: 언어 옵션을 1열로 변경하여 보기 쉽게 */
@media (max-width: 768px) {
    .output-languages-grid {
        grid-template-columns: 1fr; /* 1열로 변경 */
        gap: 12px;
    }
    
    .language-option-card {
        padding: 16px 20px; /* 패딩 증가 */
        min-height: 60px; /* 높이 증가 */
    }
    
    .language-option-text {
        font-size: 15px; /* 폰트 크기 증가 */
    }
    
    .language-popup {
        padding: 24px 20px; /* 모바일에서 패딩 조정 */
        width: 95%;
        max-height: 90vh;
    }
    
    .language-popup-footer {
        padding-top: 12px;
        margin-top: 16px;
    }
    
    .language-section {
        padding: 20px; /* 섹션 패딩 증가 */
    }
}

.language-option-card {
    display: flex;
    align-items: center;
    padding: 14px 18px; /* 좌우 패딩을 조금 늘림 */
    border: 1px solid rgba(0, 0, 0, 0.1);
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(10px);
    min-height: 56px;
    position: relative;
    overflow: hidden;
    transform: translateY(0);
    box-shadow: none;
}

.language-option-card:hover {
    border-color: rgba(102, 126, 234, 0.4);
    background: rgba(102, 126, 234, 0.1);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.2);
}

.language-option-card:has(.language-checkbox:checked) {
    border-color: rgba(102, 126, 234, 0.6);
    background: rgba(102, 126, 234, 0.15);
    box-shadow: 0 4px 16px rgba(102, 126, 234, 0.3);
}

.language-checkbox {
    margin-right: 12px;
    width: 18px;
    height: 18px;
    accent-color: #667eea;
    cursor: pointer;
    flex-shrink: 0;
}

.language-option-text {
    font-size: 14px;
    font-weight: 500;
    color: #1e293b;
    line-height: 1.4;
}

.language-popup-footer {
    margin-top: 16px;
    display: flex;
    gap: 12px;
    justify-content: center;
    flex-shrink: 0;
    padding-top: 12px;
    border-top: 1px solid rgba(0, 0, 0, 0.05);
}

.language-popup-btn {
    padding: 14px 28px;
    border-radius: 10px;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    min-width: 100px;
    transform: translateY(0);
    border: none;
}

.language-popup-btn-save {
    background: linear-gradient(135deg, #4f46e5 0%, #6366f1 100%);
    color: white;
    box-shadow: 0 4px 12px rgba(79, 70, 229, 0.25);
}

.language-popup-btn-save:hover {
    box-shadow: 0 6px 20px rgba(79, 70, 229, 0.35);
    background: linear-gradient(135deg, #4338ca 0%, #5b21b6 100%);
}

.language-popup-btn-cancel {
    background: rgba(0, 0, 0, 0.05);
    color: #64748b;
    border: 1px solid rgba(0, 0, 0, 0.1);
}

.language-popup-btn-cancel:hover {
    background: rgba(0, 0, 0, 0.08);
    border-color: rgba(0, 0, 0, 0.15);
    color: #1e293b;
}

/* Toast 알림 */
.toast {
    position: fixed;
    bottom: 30px;
    right: 30px;
    background-color: rgb(32, 33, 37);
    color: #fff;
    padding: 16px 24px;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
    display: none;
    z-index: 2000;
    animation: slideIn 0.3s ease-out;
}

.toast.show {
    display: block;
}

.toast-content {
    font-size: 14px;
    font-weight: 500;
}

/* Toast 타입별 스타일 */
.toast.error {
    background-color: #ef4444;
    color: #ffffff;
    box-shadow: 0 4px 12px rgba(239, 68, 68, 0.4);
}

.toast.success {
    background-color: #10b981;
    color: #ffffff;
    box-shadow: 0 4px 12px rgba(16, 185, 129, 0.4);
}

.toast.info {
    background-color: rgb(32, 33, 37);
    color: #fff;
}

@keyframes slideIn {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

/* 저장 중 팝업 */
.save-popup-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    z-index: 3000;
    display: flex;
    align-items: center;
    justify-content: center;
    animation: fadeIn 0.2s ease-out;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

.save-popup-content {
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-radius: 18px;
    padding: 40px 50px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.15),
                inset 0 1px 0 rgba(255, 255, 255, 0.9);
    border: 1px solid rgba(0, 0, 0, 0.1);
    text-align: center;
    min-width: 280px;
}

.save-popup-icon {
    margin-bottom: 20px;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 40px;
}

/* 저장 완료 아이콘 */
.save-complete-icon {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: linear-gradient(135deg, #10b981 0%, #059669 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #FFFFFF;
    font-size: 32px;
    font-weight: bold;
    box-shadow: 0 4px 16px rgba(16, 185, 129, 0.4);
    animation: checkmarkAppear 0.4s ease-out;
}

@keyframes checkmarkAppear {
    0% {
        transform: scale(0);
        opacity: 0;
    }
    50% {
        transform: scale(1.1);
    }
    100% {
        transform: scale(1);
        opacity: 1;
    }
}

/* 점 세 개 로딩 애니메이션 */
.loading-dots {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.loading-dots .dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: linear-gradient(135deg, #4f46e5 0%, #6366f1 100%);
    animation: dotBounce 1.4s infinite ease-in-out both;
    box-shadow: 0 2px 8px rgba(79, 70, 229, 0.3);
}

.loading-dots .dot:nth-child(1) {
    animation-delay: -0.32s;
}

.loading-dots .dot:nth-child(2) {
    animation-delay: -0.16s;
}

.loading-dots .dot:nth-child(3) {
    animation-delay: 0s;
}

@keyframes dotBounce {
    0%, 80%, 100% {
        transform: scale(0.8);
        opacity: 0.5;
    }
    40% {
        transform: scale(1.2);
        opacity: 1;
    }
}

.save-popup-message {
    font-size: 16px;
    font-weight: 500;
    color: #1e293b;
    letter-spacing: -0.2px;
    line-height: 1.5;
    margin-bottom: 24px;
}

.save-popup-button-container {
    display: flex;
    justify-content: center;
    margin-top: 8px;
}

.save-popup-confirm-btn {
    padding: 12px 32px;
    background: linear-gradient(135deg, #4f46e5 0%, #6366f1 100%);
    color: #FFFFFF;
    border: none;
    border-radius: 10px;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    box-shadow: 0 4px 12px rgba(79, 70, 229, 0.25);
    min-width: 100px;
}

.save-popup-confirm-btn:hover {
    background: linear-gradient(135deg, #4338ca 0%, #5b21b6 100%);
    box-shadow: 0 6px 20px rgba(79, 70, 229, 0.35);
    transform: translateY(-1px);
}

.save-popup-confirm-btn:active {
    transform: translateY(0);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.3);
}

/* 번역 내용 스타일 */
.cp_cols .translation-item {
    padding: 15px;
    margin-bottom: 12px;
    background-color: #fff;
    border-radius: 6px;
    border-left: 3px solid #4682B4;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
    transition: transform 0.2s, box-shadow 0.2s;
}

.cp_cols .translation-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

#cp_cols_en .translation-item {
    border-left-color: #f97316;
}

.cp_cols .translation-item .time {
    font-size: 13px;
    color: #64748b;
    margin-bottom: 8px;
    font-weight: 500;
}

.cp_cols .translation-item .text {
    font-size: 16px;
    color: #000;
    line-height: 1.6;
    font-weight: 400;
}

#cp_cols_1 .translation-item .text {
    font-size: 14px;
}

#cp_cols_en .translation-item .text {
    font-size: 20px;
    color: #000;
}

.cp_cols .translation-item .time {
    color: #4a5568;
}

/* 여러 언어 번역 표시 스타일 (이미지처럼 한 줄씩) */
.translation-lang-line {
    margin-bottom: 8px;
    padding: 0;
    background-color: transparent;
    border: none;
    line-height: 1.8;
    text-align: center;
}

.translation-lang-line:last-child {
    margin-bottom: 0;
}

.translation-lang-label {
    font-size: 14px;
    font-weight: 600;
    color: #4682B4;
    margin-right: 4px;
    display: inline;
}

.translation-lang-text {
    font-size: 14px;
    color: #000;
    line-height: 1.8;
    display: inline;
}

#cp_cols_en .translation-lang-text {
    font-size: 16px;
}

/* 번역 기록 섹션의 스타일 */
.history-item-content .translation-lang-line {
    text-align: center;
    margin-bottom: 6px;
}

.history-item-content .translation-lang-label {
    font-size: 14px;
}

.history-item-content .translation-lang-text {
    font-size: 14px;
}

/* 번역 영역 가운데 정렬 */
.translation-pair .translated {
    text-align: center;
}

/* 번역 기록 섹션 */
.translation-history-section {
    padding: 30px;
    background-color: #f8fafc;
    border-top: 1px solid #e5e7eb;
    text-align: center;
}

.history-container {
    max-width: 1200px;
    margin: 0 auto;
}

.history-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
    text-align: center;
}

.history-title {
    font-size: 24px;
    font-weight: 600;
    color: #1e293b;
    margin: 0 auto;
    text-align: center;
}

.history-close-btn {
    width: 32px;
    height: 32px;
    border: none;
    background-color: #e5e7eb;
    color: #64748b;
    border-radius: 50%;
    font-size: 24px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
    line-height: 1;
}

.history-close-btn:hover {
    background-color: #d1d5db;
    color: #374151;
}

.subject-filter {
    margin-bottom: 20px;
    padding: 15px;
    background-color: #fff;
    border-radius: 8px;
    border: 1px solid #e5e7eb;
    text-align: center;
}

.subject-filter label {
    font-size: 14px;
    font-weight: 500;
    color: #374151;
    margin-right: 10px;
    text-align: center;
}

.subject-filter select {
    padding: 8px 12px;
    border: 1px solid #e5e7eb;
    border-radius: 6px;
    font-size: 14px;
    min-width: 200px;
    background-color: #fff;
    color: #374151;
    cursor: pointer;
}

.subject-filter select:focus {
    outline: none;
    border-color: #4682B4;
}

.history-list {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.history-item {
    background-color: #fff;
    border-radius: 8px;
    padding: 20px 90px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
    border-left: 4px solid #4682B4;
    text-align: center;
}

.history-item.current-translation {
    border-left-color: #10b981;
    background-color: #f0fdf4;
}

.history-item.current-translation .history-item-title {
    color: #10b981;
}

.history-item-header {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    margin-bottom: 15px;
    padding-bottom: 15px;
    border-bottom: 1px solid #e5e7eb;
}

.history-item-title {
    font-size: 18px;
    font-weight: 600;
    color: #1e293b;
    margin-bottom: 8px;
}

.history-item-meta {
    font-size: 14px;
    color: #64748b;
    line-height: 1.5;
}

.history-item-content {
    margin-top: 15px;
    text-align: center;
}

.history-item-content .translation-pair {
    margin-bottom: 15px;
    padding: 12px;
    background-color: #f8fafc;
    border-radius: 6px;
    text-align: center;
}

.translation-pair .original {
    font-size: 14px;
    color: #374151;
    margin-bottom: 8px;
    padding-bottom: 8px;
    border-bottom: 1px solid #e5e7eb;
    line-height: 1.6;
    text-align: center;
}

.translation-pair .translated {
    text-align: center;
}

.translation-pair .translated {
    font-size: 14px;
    color: #4682B4;
    line-height: 1.6;
    text-align: center;
}

.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: #64748b;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.empty-state-icon {
    font-size: 48px;
    margin-bottom: 20px;
}

.empty-state-text {
    font-size: 16px;
}

@media (max-width: 768px) {
    .lx_app_header {
        padding: 10px 15px; /* 헤더 영역 줄이기 */
        flex-direction: column;
        align-items: center; /* 가운데 정렬 */
        gap: 8px; /* 간격 줄이기 */
    }

    /* 모바일: 과목 선택을 제일 위로 */
    .menu {
        width: 100%;
        order: 1; /* 제일 위로 */
        display: flex;
        flex-direction: column;
        align-items: center; /* 가운데 정렬 */
        gap: 8px; /* 간격 줄이기 */
    }
    
    #subjectSelectBtn {
        position: static;
        transform: none;
        order: 1; /* 과목 선택이 제일 위 */
        width: 100%;
        text-align: center; /* 가운데 정렬 */
        display: flex;
        align-items: center;
        justify-content: center;
        gap: 10px;
    }
    
    /* 모바일에서 과목 선택 텍스트 크기 조정 */
    .subject-select-text {
        font-size: 18px; /* 모바일에서 크기 줄이기 */
    }
    
    /* 모바일에서 새로고침 버튼 표시 */
    .refresh-btn-mobile {
        display: inline-flex !important;
        align-items: center;
        justify-content: center;
        width: 36px;
        height: 36px;
        padding: 0;
        border: 1px solid #e5e7eb;
        border-radius: 8px;
        background: #ffffff;
        color: #64748b;
        cursor: pointer;
        flex-shrink: 0;
        box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
        transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    
    .refresh-btn-mobile:hover,
    .refresh-btn-mobile:active,
    .refresh-btn-mobile:focus {
        background: rgba(255, 255, 255, 1);
        border-color: rgba(0, 0, 0, 0.15);
        color: #1e293b;
        outline: none;
        transform: translateY(-1px);
        box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    }
    
    .refresh-btn-mobile svg {
        width: 18px;
        height: 18px;
    }
    
    /* 모바일: 번역 기록과 Q&A 버튼을 그 밑에 */
    .brand {
        width: 100%;
        order: 2; /* 버튼들이 두 번째 */
        display: flex;
        align-items: center;
        gap: 10px;
        justify-content: flex-start;
    }
    
    /* 모바일에서 로고 숨기기 */
    .brand .logo {
        display: none;
    }
    
    /* 모바일에서 Q&A 버튼 스타일 조정 */
    .qa-btn-mobile {
        display: inline-flex !important;
        position: static !important; /* fixed에서 static으로 변경 */
        padding: 8px 16px !important;
        min-width: auto !important;
        height: auto !important;
        font-size: 14px !important;
        border-radius: 8px !important;
        border: 1px solid #e5e7eb !important;
        background: #ffffff !important;
        color: #374151 !important;
        box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1) !important;
    }
    
    .qa-btn-mobile .k-button-text {
        font-size: 14px !important;
        font-weight: 500 !important;
        padding: 0 !important;
    }
    
    /* 모바일에서 번역 기록 버튼 스타일 */
    .history-toggle-btn-wrapper.qa-btn-mobile {
        display: inline-flex !important;
        position: static !important;
        padding: 8px 16px !important;
        min-width: auto !important;
        height: auto !important;
        font-size: 14px !important;
        border-radius: 8px !important;
        border: 1px solid #e5e7eb !important;
        background: #ffffff !important;
        color: #374151 !important;
        box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1) !important;
    }
    
    /* 모바일에서 데스크탑 Q&A 버튼 숨기기 */
    .qa-btn-desktop {
        display: none !important;
    }
    
    /* 모바일에서 데스크탑 번역 기록 버튼 숨기기 */
    .history-toggle-btn-wrapper:not(.qa-btn-mobile) {
        display: none !important;
    }

    /* 모바일에서 방 번호 표시를 이미지처럼 세로 배치 */
    .room-code-display-inline {
        flex-direction: column;
        align-items: flex-start;
        gap: 4px;
        padding: 12px 16px;
        background: #ffffff;
        border: none;
        border-radius: 0;
        backdrop-filter: none;
    }

    .room-code-label {
        font-size: 12px;
        font-weight: 400;
        color: #666666;
        line-height: 1.2;
    }

    .room-code-text {
        font-size: 20px;
        font-weight: 600;
        color: #1e293b;
        letter-spacing: 1px;
        font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
        line-height: 1.2;
    }

    .app_header {
        flex-direction: column;
        align-items: stretch;
    }

    .k-button {
        width: 100%;
        justify-content: center;
    }

    .modal-content {
        width: 95%;
        margin: 20px;
    }
}

/* 번역 기록 모달 스타일 - 기존 modal-overlay를 사용하므로 추가 스타일만 정의 */
.modal-overlay#translationHistoryModal {
    z-index: 2000;
}

.modal-content.course-detail-modal {
    max-width: 1000px;
    max-height: 80vh;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    animation: modalSlideIn 0.3s ease;
}

@keyframes modalSlideIn {
    from {
        opacity: 0;
        transform: translateY(-50px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 번역 기록 모달 헤더 스타일 오버라이드 */
#translationHistoryModal .modal-header {
    background: #3682D7;
    color: white;
}

#translationHistoryModal .modal-header h2 {
    color: white;
}

#translationHistoryModal .modal-close {
    background: transparent;
    border: none;
    color: white;
    font-size: 32px;
}

#translationHistoryModal .modal-close:hover {
    background: rgba(255, 255, 255, 0.1);
    color: white;
    transform: scale(1.2);
}

/* 교과 상세 모달 바디 스타일 */
.course-detail-body {
    max-height: calc(80vh - 150px);
    overflow-y: auto;
    padding: 15px 30px;
}

#translationHistoryModal .modal-body {
    padding: 15px 30px;
    overflow-y: auto;
    flex: 1;
    max-height: calc(80vh - 150px);
}

#translationHistoryModal .modal-body::-webkit-scrollbar {
    width: 8px;
}

#translationHistoryModal .modal-body::-webkit-scrollbar-track {
    background: #f1f1f1;
    border-radius: 4px;
}

#translationHistoryModal .modal-body::-webkit-scrollbar-thumb {
    background: #888;
    border-radius: 4px;
}

#translationHistoryModal .modal-body::-webkit-scrollbar-thumb:hover {
    background: #555;
}

.course-info-section {
    margin-bottom: 30px;
    padding-bottom: 20px;
    border-bottom: 2px solid #e9ecef;
}

.section-title-modal {
    font-size: 18px;
    font-weight: 600;
    color: #333;
    margin: 0 0 20px 0;
    padding-bottom: 10px;
    border-bottom: 2px solid #3682D7;
}

.course-info-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 15px;
}

.info-item-modal {
    display: flex;
    align-items: center;
    gap: 10px;
}

.info-label-modal {
    font-size: 14px;
    font-weight: 600;
    color: #666;
    min-width: 100px;
}

.info-value-modal {
    font-size: 14px;
    color: #333;
    font-weight: 500;
}

.translation-records-section {
    margin-top: 0;
}

.records-header-controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
    padding: 0 5px;
}

.select-all-checkbox {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    font-size: 14px;
    color: #333;
    user-select: none;
}

.select-all-checkbox input[type="checkbox"] {
    width: 18px;
    height: 18px;
    cursor: pointer;
}

.record-checkbox-wrapper {
    display: flex;
    align-items: center;
    padding: 0 10px;
}

.record-checkbox {
    width: 18px;
    height: 18px;
    cursor: pointer;
}

.translation-records-list {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.translation-record-item {
    background: white;
    border-radius: 8px;
    border: 1px solid #e9ecef;
    transition: box-shadow 0.3s;
    overflow: hidden;
    margin-bottom: 12px;
}

.translation-record-item:hover {
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.record-header {
    margin-bottom: 0;
    padding: 15px 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 15px;
    background: #f8f9fa;
    /*  FOUC 방지: background-color transition 제거 */
    transition: none;
    cursor: pointer;
}

.record-checkbox {
    display: flex;
    align-items: center;
    margin-right: 12px;
}

.record-checkbox input[type="checkbox"] {
    width: 18px;
    height: 18px;
    cursor: pointer;
}

.record-header:hover {
    background: #e9ecef;
}

.record-date-info {
    display: flex;
    align-items: center;
    gap: 8px;
    flex: 1;
}

.record-right-info {
    display: flex;
    align-items: center;
    gap: 12px;
}

.accordion-icon {
    font-size: 12px;
    color: #666;
    transition: transform 0.3s;
    user-select: none;
    cursor: pointer;
    padding: 4px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.record-subject {
    font-size: 16px;
    font-weight: 600;
    color: #3682D7;
    margin-right: 8px;
}

.record-date {
    font-size: 16px;
    font-weight: 600;
    color: #000000;
}

.record-time {
    font-size: 12px;
    color: #999;
    font-weight: 400;
}

.record-duration {
    font-size: 14px;
    color: #666;
    background: #e9ecef;
    padding: 4px 12px;
    border-radius: 12px;
    font-weight: 500;
}

.record-content {
    padding: 0;
    background: white;
    border-radius: 0 0 8px 8px;
    animation: slideDown 0.3s ease;
    display: none; /* 기본적으로 접혀있는 상태 */
    border-top: 1px solid #e9ecef;
}

.record-language-tabs {
    display: flex;
    gap: 0;
    margin: 0;
    padding: 0 20px;
    border-bottom: 2px solid #e9ecef;
}

.lang-tab-btn {
    padding: 12px 20px;
    border: none;
    background: transparent;
    color: #666;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    border-bottom: 3px solid transparent;
    margin-bottom: -2px;
    position: relative;
}

.lang-tab-btn:hover {
    color: #3682D7;
    background: #f8f9fa;
}

.lang-tab-btn.active {
    color: #3682D7;
    border-bottom-color: #3682D7;
    font-weight: 600;
}

.record-translation-content {
    margin-top: 0;
    padding: 20px;
}

.translation-text-block {
    padding: 0;
    background: transparent;
    border-left: 4px solid #3682D7;
    border-radius: 0;
    font-size: 15px;
    line-height: 1.8;
    color: #1e293b;
    margin-bottom: 15px;
    padding-left: 16px;
}

.translation-text-block:last-child {
    margin-bottom: 0;
}

.translation-line-item {
    margin-bottom: 16px;
    line-height: 1.8;
    display: flex;
    flex-direction: column;
}

.translation-line-item:first-child {
    margin-top: 0;
}

.translation-line-item:last-child {
    margin-bottom: 0;
}

.translation-time {
    color: #666;
    font-size: 13px;
    font-weight: 500;
    font-family: monospace;
    margin-bottom: 4px;
    white-space: nowrap;
}

.translation-text {
    color: #1e293b;
}

.accordion-icon {
    font-size: 12px;
    color: #666;
    transition: transform 0.3s;
    user-select: none;
    cursor: pointer;
    padding: 5px;
    margin-right: 10px;
}

@keyframes slideDown {
    from {
        opacity: 0;
        max-height: 0;
    }
    to {
        opacity: 1;
        max-height: 1000px;
    }
}

.language-sections-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 15px;
}

.language-section {
    background: #f8f9fa;
    border-radius: 8px;
    overflow: hidden;
    border: 1px solid #e9ecef;
}

.lang-section-header {
    background: #3682D7;
    color: white;
    padding: 12px 15px;
    font-size: 14px;
    font-weight: 600;
    text-align: center;
}

.lang-section-content {
    padding: 15px;
    font-size: 14px;
    color: #333;
    line-height: 1.6;
    min-height: 60px;
}

.modal-footer {
    padding: 20px 30px;
    background: #f8f9fa;
    border-top: 1px solid #e9ecef;
    display: flex;
    justify-content: flex-end;
    gap: 10px;
}

.modal-btn {
    padding: 10px 20px;
    border: none;
    border-radius: 6px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
}

.modal-btn.primary {
    background: #3682D7;
    color: white;
}

.modal-btn.primary:hover {
    background: #2a6bc0;
}

.modal-btn.secondary {
    background: #6c757d;
    color: white;
}

.modal-btn.secondary:hover {
    background: #5a6268;
}

.modal-btn.danger {
    background: #dc3545;
    color: white;
}

.modal-btn.danger:hover {
    background: #c82333;
}

@media (max-width: 768px) {
    .toast {
        bottom: 20px;
        right: 20px;
        left: 20px;
    }
    
    /* 모바일: 번역 기록 모달 하단 버튼 정렬 */
    #translationHistoryModal .modal-footer {
        flex-direction: column;
        gap: 10px;
        padding: 15px 20px;
    }
    
    #translationHistoryModal .modal-footer .modal-btn {
        width: 100%;
        margin: 0 !important; /* margin-right: auto 제거 */
        padding: 12px 20px;
        font-size: 14px;
    }
    
    /* 버튼 순서 조정: 기록 삭제, 선택한 기록 내보내기, 닫기 */
    #translationHistoryModal .modal-footer .modal-btn.danger {
        order: 1;
    }
    
    #translationHistoryModal .modal-footer .modal-btn.secondary {
        order: 2;
    }
    
    #translationHistoryModal .modal-footer .modal-btn.primary {
        order: 3;
    }
}

/* 강의 시작/종료 토글 버튼 스타일 */
#lectureToggleBtn,
button#lectureToggleBtn.k-button {
    /* 언어 설정 버튼과 동일한 크기 */
    height: 40px !important;
    min-height: 40px !important;
    padding: 8px 24px !important;
    min-width: 100px !important;
    font-size: 14px !important;
    font-weight: 600 !important;
    border-radius: 12px !important;
    cursor: pointer;
    white-space: nowrap;
    flex-shrink: 0;
    box-sizing: border-box !important;
}

/* 시작 버튼 스타일 (언어 설정 버튼과 동일한 스타일) */
#lectureToggleBtn:not(.lecture-end),
button#lectureToggleBtn.k-button:not(.lecture-end) {
    background: rgba(255, 255, 255, 0.9) !important;
    color: #1e293b !important;
    border: 1px solid rgba(0, 0, 0, 0.1) !important;
    box-shadow: none !important;
}

#lectureToggleBtn:not(.lecture-end):hover,
button#lectureToggleBtn.k-button:not(.lecture-end):hover {
    background: rgba(255, 255, 255, 1) !important;
    border-color: rgba(0, 0, 0, 0.15) !important;
}

/* 종료 버튼 스타일 (빨간색 - 상담 종료와 동일) */
#lectureToggleBtn.lecture-end,
button#lectureToggleBtn.k-button.lecture-end {
    background: #ff6b6b !important;
    color: white !important;
}

#lectureToggleBtn.lecture-end:hover,
button#lectureToggleBtn.k-button.lecture-end:hover {
    background: #ee5a5a !important;
}

#lectureToggleBtn:disabled,
button#lectureToggleBtn.k-button:disabled {
    background: #94a3b8 !important;
    cursor: not-allowed;
    transform: none;
    box-shadow: none !important;
}

/* 기존 red 클래스 제거 (lecture-end로 대체) */
#lectureToggleBtn.red,
button#lectureToggleBtn.k-button.red {
    background: #ff6b6b !important;
    color: white !important;
}

/* 다크 모드 - 시작 버튼 스타일 */
body.dark-mode #lectureToggleBtn:not(.lecture-end),
body.dark-mode button#lectureToggleBtn.k-button:not(.lecture-end) {
    background: #374151 !important;
    background-color: #374151 !important;
    color: #f7fafc !important;
    border: 1px solid #4b5563 !important;
    border-color: #4b5563 !important;
}

body.dark-mode #lectureToggleBtn:not(.lecture-end):hover,
body.dark-mode button#lectureToggleBtn.k-button:not(.lecture-end):hover {
    background: #4b5563 !important;
    background-color: #4b5563 !important;
    border-color: #6b7280 !important;
    color: #ffffff !important;
}