@import url('https://fonts.googleapis.com/css2?family=DM+Sans:wght@300;400;500;600&family=DM+Mono:wght@400;500&display=swap');

:root {
    --bg-primary:    #f4f5f7;
    --bg-secondary:  #ffffff;
    --bg-tertiary:   #f8f9fb;
    --bg-hover:      #eceef2;
    --bg-card:       #edf0f4;
    --text-primary:   #1a1d23;
    --text-secondary: #6b7280;
    --text-muted:     #9ca3af;
    --border-color:   #e8eaed;
    --border-color-2: #dde1e7;
    --accent-color:   #2563eb;
    --accent-light:   #eff6ff;
    --accent-hover:   #1d4ed8;
    --success-color:  #16a34a;
    --success-light:  #f0fdf4;
    --danger-color:   #dc2626;
    --danger-light:   #fef2f2;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.08), 0 2px 4px rgba(0,0,0,0.04);
    --shadow-lg: 0 12px 32px rgba(0,0,0,0.10), 0 4px 8px rgba(0,0,0,0.04);
    --radius-sm: 6px; --radius-md: 10px; --radius-lg: 16px; --radius-xl: 20px;
    --color-learning: #0891b2; --color-wrong: #ea580c; --color-safe: #16a34a;
    --color-dialog-a: #2563eb; --color-dialog-b: #7c3aed;
    --color-dialog-highlight: rgba(37,99,235,0.08);
    --transition: 0.18s ease;
}

body.dark-mode, html.dark-mode {
    --bg-primary:    #0f1117;
    --bg-secondary:  #1a1d27;
    --bg-tertiary:   #151820;
    --bg-hover:      #252837;
    --bg-card:       #1e2130;
    --text-primary:   #e8eaf0;
    --text-secondary: #8b92a8;
    --text-muted:     #5c6380;
    --border-color:   #252838;
    --border-color-2: #2e3347;
    --accent-color:   #3b82f6;
    --accent-light:   rgba(59,130,246,0.12);
    --accent-hover:   #60a5fa;
    --success-color:  #22c55e;
    --success-light:  rgba(34,197,94,0.1);
    --danger-color:   #ef4444;
    --danger-light:   rgba(239,68,68,0.1);
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.25);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.35);
    --shadow-lg: 0 12px 32px rgba(0,0,0,0.45);
    --color-learning: #22d3ee; --color-wrong: #fb923c; --color-safe: #4ade80;
    --color-dialog-a: #60a5fa; --color-dialog-b: #a78bfa;
    --color-dialog-highlight: rgba(96,165,250,0.1);
}

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

body {
    font-family: 'DM Sans', 'Malgun Gothic', -apple-system, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    padding: 24px 20px;
    min-height: 100vh;
    transition: background-color var(--transition), color var(--transition);
}

.container {
    max-width: 960px;
    margin: 0 auto;
    background: var(--bg-secondary);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    padding: 28px 32px 32px;
    border: 1px solid var(--border-color);
    transition: background-color var(--transition);
}

h1 {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    margin-bottom: 24px;
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
    letter-spacing: -0.3px;
}

.dark-mode-toggle {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    padding: 7px 10px;
    border-radius: var(--radius-md);
    cursor: pointer;
    font-size: 16px;
    color: var(--text-secondary);
    transition: all var(--transition);
    line-height: 1;
}
.dark-mode-toggle:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

.toggle-header {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    padding: 11px 16px;
    border-radius: var(--radius-md);
    cursor: pointer;
    font-weight: 500;
    font-size: 13.5px;
    color: var(--text-secondary);
    text-align: center;
    margin-bottom: 12px;
    user-select: none;
    transition: all var(--transition);
}
.toggle-header:hover { background: var(--bg-hover); color: var(--text-primary); }

.toggle-content {
    display: none;
    padding: 20px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    margin-bottom: 16px;
    border: 1px solid var(--border-color);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(110px, 1fr));
    gap: 10px;
    margin-bottom: 16px;
}

.stat-item {
    background: var(--bg-secondary);
    padding: 14px 10px;
    border-radius: var(--radius-md);
    text-align: center;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    transition: background-color var(--transition);
}

.stat-value {
    font-size: 22px;
    font-weight: 700;
    color: var(--accent-color);
    font-family: 'DM Mono', monospace;
    letter-spacing: -0.5px;
}

.stat-label {
    font-size: 11.5px;
    color: var(--text-muted);
    margin-top: 3px;
    font-weight: 500;
}

.chart-bar {
    height: 18px;
    background: linear-gradient(90deg, var(--accent-color), #60a5fa);
    border-radius: 4px;
    text-align: right;
    padding-right: 6px;
    color: white;
    font-size: 11px;
    line-height: 18px;
    font-family: 'DM Mono', monospace;
}

.settings {
    background: var(--bg-tertiary);
    padding: 16px 18px;
    border-radius: var(--radius-lg);
    margin-bottom: 20px;
    border: 1px solid var(--border-color);
    transition: background-color var(--transition);
}

.setting-group {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 4px 6px;
    padding: 7px 0;
    border-bottom: 1px solid var(--border-color);
    font-size: 13.5px;
}
.setting-group:last-child { border-bottom: none; padding-bottom: 0; }
.setting-group:first-child { padding-top: 0; }
.setting-group label { color: var(--text-secondary); font-weight: 500; font-size: 13px; cursor: pointer; }

input[type="checkbox"] { width: 15px; height: 15px; accent-color: var(--accent-color); cursor: pointer; }
input[type="radio"] { accent-color: var(--accent-color); cursor: pointer; }

input[type="number"] {
    width: 58px;
    padding: 5px 8px;
    border: 1px solid var(--border-color-2);
    border-radius: var(--radius-sm);
    text-align: center;
    background: var(--bg-secondary);
    color: var(--text-primary);
    font-family: 'DM Mono', monospace;
    font-size: 13px;
    transition: all var(--transition);
    outline: none;
}
input[type="number"]:focus { border-color: var(--accent-color); box-shadow: 0 0 0 3px var(--accent-light); }

select {
    padding: 5px 10px;
    border: 1px solid var(--border-color-2);
    border-radius: var(--radius-sm);
    background: var(--bg-secondary);
    color: var(--text-primary);
    font-size: 13px;
    cursor: pointer;
    outline: none;
    transition: all var(--transition);
}
select:focus { border-color: var(--accent-color); box-shadow: 0 0 0 3px var(--accent-light); }

.flash-card {
    height: 380px;
    max-height: 480px;
    overflow-y: auto;
    background: var(--bg-secondary);
    border: 1.5px solid var(--border-color);
    border-radius: var(--radius-xl);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    margin: 0 0 20px;
    padding: 32px 28px;
    text-align: center;
    position: relative;
    transition: all var(--transition);
    box-shadow: var(--shadow-sm);
}
.flash-card:hover { border-color: var(--border-color-2); box-shadow: var(--shadow-md); }

.main-text {
    font-size: 38px;
    font-weight: 700;
    margin-bottom: 16px;
    color: var(--text-primary);
    width: 100%;
    word-break: break-word;
    overflow-wrap: break-word;
    cursor: pointer;
    letter-spacing: -1px;
    line-height: 1.15;
    transition: color var(--transition);
}
.main-text:hover { color: var(--accent-color); }

.sub-text {
    font-size: 22px;
    color: var(--text-secondary);
    font-weight: 400;
    word-break: break-word;
    overflow-wrap: break-word;
    letter-spacing: -0.3px;
}

.progress {
    width: 100%;
    height: 3px;
    background: var(--bg-card);
    position: absolute;
    bottom: 0;
    left: 0;
    border-radius: 0 0 var(--radius-xl) var(--radius-xl);
    overflow: hidden;
}
.progress-bar {
    height: 100%;
    background: linear-gradient(90deg, var(--accent-color), #60a5fa);
    width: 0%;
    transition: width 0.1s linear;
}

.quiz-options {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
    width: 100%;
    margin-top: 16px;
}

.quiz-btn {
    padding: 16px 12px;
    font-size: 16px;
    font-weight: 500;
    color: var(--text-primary);
    background: var(--bg-tertiary);
    border: 1.5px solid var(--border-color-2);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition);
    font-family: inherit;
    letter-spacing: -0.2px;
}
body.dark-mode .quiz-btn { color: var(--text-primary) !important; }
.quiz-btn:hover { background: var(--bg-hover); border-color: var(--accent-color); transform: translateY(-2px); box-shadow: var(--shadow-md); }
.quiz-btn.correct { background: var(--success-light) !important; border-color: var(--success-color) !important; color: var(--success-color) !important; font-weight: 600; }
.quiz-btn.wrong { background: var(--danger-light) !important; border-color: var(--danger-color) !important; color: var(--danger-color) !important; font-weight: 600; }

.btn-group { display: flex; gap: 8px; flex-wrap: wrap; justify-content: center; margin-bottom: 12px; }

.btn {
    padding: 10px 18px;
    border: none;
    border-radius: var(--radius-md);
    font-weight: 500;
    font-size: 13.5px;
    cursor: pointer;
    color: white;
    transition: all var(--transition);
    font-family: inherit;
    letter-spacing: 0.1px;
    white-space: nowrap;
}
.btn:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); filter: brightness(1.08); }
.btn:active { transform: translateY(0); }
.btn:disabled { opacity: 0.38; cursor: not-allowed; transform: none !important; box-shadow: none !important; filter: none !important; }
.btn-green { background: var(--success-color); }
.btn-red   { background: var(--danger-color); }
.btn-gray  { background: #6b7280; }
.btn-blue  { background: var(--accent-color); }

.status {
    text-align: center;
    font-size: 13px;
    color: var(--text-muted);
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 16px;
    font-family: 'DM Mono', monospace;
    padding: 4px 0;
}
#stMsg { color: var(--text-secondary); font-family: 'DM Sans', sans-serif; }
#cntMsg { color: var(--accent-color); font-weight: 600; }

.modal {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(10,12,18,0.65);
    backdrop-filter: blur(6px);
    z-index: 1000;
    justify-content: center;
    align-items: center;
}
.modal-content {
    background: var(--bg-secondary);
    width: 95%;
    max-width: 640px;
    border-radius: var(--radius-xl);
    padding: 28px;
    max-height: 82vh;
    overflow-y: auto;
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-color);
    animation: modalIn 0.22s ease;
}
@keyframes modalIn {
    from { opacity: 0; transform: scale(0.96) translateY(8px); }
    to   { opacity: 1; transform: scale(1) translateY(0); }
}
.modal-content h3 {
    font-size: 17px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 18px;
    text-align: center;
    letter-spacing: -0.3px;
}

.data-table { width: 100%; border-collapse: collapse; font-size: 13.5px; }
.data-table th {
    padding: 10px 12px;
    border-bottom: 2px solid var(--border-color-2);
    text-align: left;
    font-weight: 600;
    font-size: 11px;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.6px;
}
.data-table td { padding: 12px 12px; border-bottom: 1px solid var(--border-color); color: var(--text-primary); }
.data-table tr:last-child td { border-bottom: none; }
.data-table tr:hover td { background: var(--bg-tertiary); }

.speaker-btn {
    font-size: 18px;
    color: var(--accent-color);
    cursor: pointer;
    padding: 4px 6px;
    border-radius: var(--radius-sm);
    transition: all var(--transition);
    background: transparent;
    border: none;
}
.speaker-btn:hover { background: var(--accent-light); transform: scale(1.1); }

.text-wrong   { color: var(--danger-color); font-weight: 600; }
.text-correct { color: var(--success-color); font-weight: 600; }

.dialog-role-A { color: var(--color-dialog-a); font-weight: 700; }
.dialog-role-B { color: var(--color-dialog-b); font-weight: 700; }
.dialog-both-container { width: 100%; display: flex; flex-direction: column; gap: 12px; }
.dialog-line { padding: 14px 16px; border-radius: var(--radius-md); background: var(--bg-tertiary); border: 1px solid var(--border-color); transition: all 0.25s ease; }
.dialog-line.reading { background: var(--color-dialog-highlight); border-color: var(--accent-color); transform: scale(1.015); box-shadow: var(--shadow-sm); }
.dialog-line-header { font-size: 11px; margin-bottom: 6px; opacity: 0.7; font-weight: 600; text-transform: uppercase; letter-spacing: 0.5px; }
.dialog-line-text { font-size: 15px; font-weight: 600; margin-bottom: 4px; }
.dialog-line-translation { font-size: 12.5px; color: var(--text-secondary); }

.stage-toolbar { display: none; position: fixed; top: 14px; right: 14px; z-index: 10001; gap: 6px; }
.stage-btn { border: 1px solid var(--border-color); border-radius: var(--radius-md); padding: 9px 12px; cursor: pointer; background: var(--bg-secondary); color: var(--text-primary); box-shadow: var(--shadow-md); font-size: 15px; transition: all var(--transition); }
.stage-btn:hover { background: var(--bg-hover); transform: translateY(-1px); }
body.stage-full { overflow: hidden; }
body.stage-full .container { max-width: none !important; width: 100% !important; padding: 0 !important; margin: 0 !important; border-radius: 0 !important; border: none !important; box-shadow: none !important; }
body.stage-full .container > h1 { display: none !important; }
body.stage-full #studyStage { position: fixed; inset: 0; z-index: 10000; overflow: auto; padding: 20px; background: var(--bg-secondary); }
body.stage-full .settings { display: none; }
body.stage-full.stage-show-settings .settings { display: block; position: sticky; top: 56px; z-index: 10000; background: var(--bg-secondary); padding: 14px; border-radius: var(--radius-lg); box-shadow: var(--shadow-md); margin-bottom: 14px; border: 1px solid var(--border-color); }
body.stage-full .stage-toolbar { display: flex; }
body.stage-full .flash-card { min-height: calc(100vh - 160px); }

body[data-ui-lang="ko"] .lang-en { display: none !important; }
body[data-ui-lang="en"] .lang-kr { display: none !important; }
body:not([data-ui-lang]) .lang-en { display: none !important; }

div[style*="position:fixed"][style*="bottom:18px"] button {
    background: var(--bg-card) !important;
    color: var(--text-secondary) !important;
    border: 1px solid var(--border-color) !important;
    font-size: 11px !important;
    font-family: 'DM Mono', monospace;
    border-radius: var(--radius-sm) !important;
    cursor: pointer;
    transition: all var(--transition);
}
div[style*="position:fixed"][style*="bottom:18px"] button:hover {
    background: var(--bg-hover) !important;
    color: var(--text-primary) !important;
}

::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border-color-2); border-radius: 99px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }

.wordonly-hide { display: none !important; }

/* =========================================================
   📱 RESPONSIVE / MOBILE STYLES
   - 문제 원인: @media 쿼리가 전혀 없어서 모바일에서도
     PC용 고정 레이아웃(패딩·폰트·버튼 크기)이 그대로 적용됨
   ========================================================= */

/* ── 태블릿 (≤768px) ── */
@media (max-width: 768px) {
    body {
        padding: 12px 10px;
    }

    .container {
        padding: 18px 14px 20px;
        border-radius: var(--radius-lg);
    }

    h1 {
        font-size: 15px;
        gap: 6px;
        flex-wrap: wrap;
        justify-content: center;
    }

    /* 설정 패널 */
    .settings {
        padding: 12px 10px;
    }

    .setting-group {
        flex-direction: column;
        align-items: flex-start;
        gap: 8px;
        padding: 10px 0;
    }

    /* 버튼 그룹 */
    .btn-group {
        gap: 6px;
        flex-wrap: wrap;
    }

    .btn {
        padding: 9px 14px;
        font-size: 13px;
        flex: 1 1 auto;
        text-align: center;
        min-width: 80px;
    }

    /* 퀴즈 버튼 2열 유지하되 크기 축소 */
    .quiz-options {
        grid-template-columns: 1fr 1fr;
        gap: 8px;
    }

    .quiz-btn {
        padding: 12px 8px;
        font-size: 14px;
    }

    /* 플래시카드 */
    .flash-card {
        height: auto;
        min-height: 200px;
        max-height: none;
        padding: 18px 14px;
    }

    .flash-card .word-display {
        font-size: 28px !important;
    }

    /* 통계 그리드 */
    .stats-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 8px;
    }

    .stat-item {
        padding: 10px 6px;
    }

    .stat-value {
        font-size: 18px !important;
    }

    .stat-label {
        font-size: 10px !important;
    }

    /* number/select 입력 */
    input[type="number"] {
        width: 64px;
        font-size: 14px;
        padding: 6px 8px;
    }

    select {
        width: 100% !important;
        max-width: 100%;
        font-size: 14px;
        padding: 7px 10px;
    }

    /* 체크박스/라디오 레이블 크기 */
    .setting-group label {
        font-size: 14px;
    }

    input[type="checkbox"],
    input[type="radio"] {
        width: 17px;
        height: 17px;
    }

    /* 토글 헤더 */
    .toggle-header {
        font-size: 13px;
        padding: 10px 14px;
    }

    /* 모달 */
    .modal-content {
        padding: 18px 14px;
        width: 97%;
    }

    /* 다크모드·언어 버튼 */
    .dark-mode-toggle {
        padding: 7px 9px;
        font-size: 14px;
    }

    /* 데이터 테이블 */
    .data-table {
        font-size: 12px;
    }

    .data-table th,
    .data-table td {
        padding: 8px 8px;
    }

    /* 대화(dialog) 라인 */
    .dialog-line-text {
        font-size: 14px;
    }

    .dialog-line-translation {
        font-size: 11.5px;
    }
}

/* ── 소형 스마트폰 (≤480px) ── */
@media (max-width: 480px) {
    body {
        padding: 6px 4px;
    }

    .container {
        padding: 14px 10px 16px;
        border-radius: var(--radius-md);
    }

    h1 {
        font-size: 13.5px;
    }

    /* 버튼 전체 너비 */
    .btn {
        width: 100%;
        padding: 11px 10px;
        font-size: 14px;
    }

    .btn-group {
        flex-direction: column;
    }

    /* 퀴즈 버튼 1열로 */
    .quiz-options {
        grid-template-columns: 1fr;
    }

    .quiz-btn {
        padding: 14px 10px;
        font-size: 15px;
    }

    /* 통계 그리드 2열 */
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    /* 플래시카드 글자 */
    .flash-card .word-display {
        font-size: 24px !important;
    }

    /* 설정 그룹 */
    .settings {
        padding: 10px 8px;
    }

    .setting-group {
        gap: 6px;
    }

    .setting-group label {
        font-size: 13.5px;
    }

    /* 스테이지 툴바 버튼 */
    .stage-btn {
        padding: 8px 10px;
        font-size: 13px;
    }

    /* number 입력 */
    input[type="number"] {
        width: 60px;
        font-size: 14px;
    }

    /* 파일 로드 버튼 특별 처리 */
    .btn[onclick*="fileInput"],
    .btn[onclick*="PDFLoader"] {
        font-size: 14px !important;
    }

    /* 대화 줄 */
    .dialog-line {
        padding: 10px 12px;
    }

    .dialog-line-text {
        font-size: 13.5px;
    }

    /* 모달 */
    .modal-content {
        padding: 14px 10px;
        max-height: 90vh;
    }

    .modal-content h3 {
        font-size: 15px;
    }
}