/* ==========================================================================
   Core Verbs - 프리미엄 스타일시트 (style.css)
   ========================================================================== */

/* 🎨 디자인 시스템 토큰 선언 */
:root {
    --bg-primary: #f4f6f9;
    --card-bg: #ffffff;
    --text-main: #2c3e50;
    --text-sub: #7f8c8d;
    --text-hint: #95a5a6;
    --primary-color: #81B29A;
    --accent-red: #e53935;
    --accent-green: #43a047;
    --blue-glow: #3498db;
    --shadow-soft: 0 8px 24px rgba(149, 157, 165, 0.12);
    --shadow-card: 0 10px 30px rgba(0, 0, 0, 0.05);
    --transition-smooth: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
}

/* 📱 기본 레이아웃 초기화 */
* { 
    box-sizing: border-box; 
    -webkit-tap-highlight-color: transparent;
} 

body { 
    font-family: 'Pretendard', -apple-system, BlinkMacSystemFont, system-ui, sans-serif; 
    display: flex; 
    flex-direction: column; 
    align-items: center; 
    justify-content: flex-start; 
    min-height: 100dvh; 
    background-color: var(--bg-primary); 
    margin: 0; 
    padding: 2vh 0; 
    overflow-x: hidden;
}

/* 🧭 헤더 바 (앱 타이틀 + 설정 버튼) */
.header-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 92%;
    max-width: 450px;
    margin-bottom: 1.5vh;
    padding: 0 4px;
}

.app-title {
    font-size: 1.6rem; 
    color: var(--text-main); 
    font-weight: 800;
    letter-spacing: -0.5px;
    margin: 0;
}

/* ⚙️ 설정 아이콘 버튼 */
#btn-settings {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    padding: 6px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-main);
    transition: var(--transition-smooth);
}

#btn-settings:hover {
    background-color: rgba(0, 0, 0, 0.05);
    transform: rotate(45deg);
}

#btn-settings:active {
    transform: rotate(90deg) scale(0.9);
}

/* 📱 뷰 레이아웃 공통 (가운데 정렬) */
#study-view,
#question-view {
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
}

/* 📊 학습 통계 대시보드 */
.stats-container {
    width: 92%;
    max-width: 450px;
    background-color: var(--card-bg); 
    border-radius: 18px;
    padding: 16px 14px;
    box-shadow: var(--shadow-soft);
    margin-bottom: 2vh;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.stats-header {
    font-size: 1.05rem;
    color: #34495e;
    font-weight: 800;
    margin-bottom: 12px;
    letter-spacing: -0.5px;
}

#stats-dashboard {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 8px;
    width: 100%;
}

.stat-box {
    padding: 10px 4px;
    border-radius: 12px;
    font-size: 0.72rem;
    font-weight: 700;
    text-align: center;
    box-shadow: 0 2px 6px rgba(0,0,0,0.03);
    line-height: 1.4;
    letter-spacing: -0.5px;
    transition: var(--transition-smooth);
}

.stat-box span {
    font-size: 1.15rem;
    font-weight: 800;
    display: block;
    margin-top: 4px;
}

.new-box { background-color: #f1f8e9; color: #558b2f; border: 1px solid #dcedc8; }
.danger-box { background-color: #ffebee; color: #c62828; border: 1px solid #ffcdd2; }
.mid-box { background-color: #fff8e1; color: #f57f17; border: 1px solid #ffe082; }
.long-box { background-color: #e3f2fd; color: #1565c0; border: 1px solid #bbdefb; }

/* 📈 진행 바 */
.progress-wrapper {
    display: flex; 
    flex-direction: column; 
    align-items: center; 
    width: 92%; 
    max-width: 450px; 
    margin-bottom: 2vh;
}

.session-progress { 
    color: #555; 
    font-weight: 700; 
    font-size: 0.95rem; 
    margin-bottom: 8px;
    align-self: flex-start; 
    padding-left: 5px;
}

#progress-bar-bg {
    width: 100%;
    height: 10px;
    background-color: #e2e8f0;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: inset 0 1px 3px rgba(0,0,0,0.05);
}

#progress-bar-fill {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, #a8dadc, #81B29A);
    border-radius: 10px;
    transition: width 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

/* 🃏 메인 학습 카드 */
#card { 
    background: var(--card-bg); 
    width: 92%; 
    max-width: 450px; 
    flex-grow: 1; 
    margin-bottom: 2vh; 
    padding: 65px 24px 30px 24px; 
    border-radius: 20px; 
    box-shadow: var(--shadow-card), var(--shadow-soft); 
    text-align: center; 
    cursor: pointer; 
    display: flex; 
    flex-direction: column; 
    justify-content: center; 
    align-items: center;
    position: relative;
    border: 1px solid rgba(255, 255, 255, 0.8);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

#card:active {
    transform: scale(0.995);
}

#verb-badge {
    font-size: 0.9rem; 
    color: var(--text-sub); 
    font-weight: 800; 
    letter-spacing: 1px;
    position: absolute; 
    top: 25px; 
    left: 50%; 
    transform: translateX(-50%); 
    width: 100%;
    text-transform: uppercase;
}

#wrong-badge {
    display: none;
    font-size: 0.82rem;
    color: #e07a5f;
    background-color: #fdf0ed;
    padding: 4px 10px;
    border-radius: 20px;
    font-weight: 700;
    margin-bottom: 15px;
    border: 1px solid #f9d5cc;
}

#korean { 
    font-size: clamp(1.2rem, 5.2vw, 1.45rem); 
    color: var(--text-main); 
    font-weight: 800; 
    margin-bottom: 20px; 
    word-break: keep-all; 
    line-height: 1.45; 
}

#hint { 
    font-size: 0.9rem; 
    color: var(--text-hint); 
    margin-top: 10px; 
    font-weight: 500;
    background-color: #f8f9fa;
    padding: 6px 14px;
    border-radius: 20px;
}

#english { 
    font-size: clamp(1.15rem, 4.8vw, 1.38rem); 
    color: #2980b9; 
    margin-top: 10px; 
    display: none; 
    font-weight: 700; 
    line-height: 1.45; 
    animation: fadeIn 0.3s ease-out;
}

/* 🔊 스피커 버튼 */
#speaker { 
    font-size: 1.8rem; 
    margin-top: 0; 
    cursor: pointer; 
    display: flex; 
    padding: 12px;
    background-color: #ebf5fb;
    border-radius: 50%;
    width: 56px;
    height: 56px;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 10px rgba(41, 128, 185, 0.1);
    transition: var(--transition-smooth);
}

#speaker:hover {
    transform: scale(1.1);
    background-color: #d4e6f1;
}

#speaker:active {
    transform: scale(0.95);
}

/* 🔘 하단 액션 버튼 */
.buttons { 
    display: none; 
    gap: 15px; 
    width: 92%; 
    max-width: 450px; 
    justify-content: center; 
    padding-bottom: 3vh; 
}

button.action-btn { 
    flex: 1; 
    padding: 18px; 
    font-size: 1.25rem; 
    border: none; 
    border-radius: 16px; 
    cursor: pointer; 
    color: white; 
    font-weight: 800; 
    transition: var(--transition-smooth); 
    font-family: inherit;
    box-shadow: 0 4px 6px rgba(0,0,0,0.06);
}

#btn-x { 
    background-color: var(--accent-red); 
    box-shadow: 0 4px 0 #b71c1c; 
}

#btn-o { 
    background-color: var(--accent-green); 
    box-shadow: 0 4px 0 #1b5e20; 
}

button.action-btn:active { 
    transform: translateY(4px); 
    box-shadow: 0 0 0 transparent; 
} 

/* 🔔 플로팅 피드백 토스트 */
#feedback-msg {
    display: none; 
    position: fixed; 
    top: 50%; 
    left: 50%; 
    transform: translate(-50%, -50%); 
    color: white; 
    padding: 22px 24px; 
    border-radius: 16px; 
    font-size: 1.15rem; 
    z-index: 2000; 
    font-weight: 700; 
    text-align: center; 
    width: 85%; 
    max-width: 320px; 
    line-height: 1.5;
    box-shadow: 0 10px 25px rgba(0,0,0,0.2);
    animation: zoomIn 0.25s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

/* 🎉 완료 스크린 */
#completion-msg {
    display: none; 
    font-size: 1.4rem; 
    color: #4CAF50; 
    font-weight: 700; 
    text-align: center; 
    line-height: 1.6;
}

#btn-reload {
    background-color: #2c3e50; 
    box-shadow: 0 4px 0 #1a252f;
    margin-top: 30px;
    font-size: 1.1rem;
    width: 80%;
    flex: none; 
}
#btn-reload:active { transform: translateY(4px); box-shadow: 0 0 0 transparent; }

/* ==========================================================================
   ⚙️ 프리미엄 원어민 발음 설정 패널 (Glassmorphism & Drawer)
   ========================================================================== */

/* 설정 활성화 시 뒷배경 어둡게 블러처리 */
.settings-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background-color: rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    z-index: 999;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
}

.settings-overlay.active {
    opacity: 1;
    pointer-events: auto;
}

/* 우측 슬라이딩 드로어 패널 */
.settings-panel {
    position: fixed;
    right: -320px;
    top: 0;
    width: 300px;
    height: 100dvh;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    box-shadow: -8px 0 30px rgba(0, 0, 0, 0.08);
    z-index: 1000;
    transition: right 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
    display: flex;
    flex-direction: column;
    padding: 24px;
    border-left: 1px solid rgba(255, 255, 255, 0.5);
}

.settings-panel.active {
    right: 0;
}

.settings-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid #edf2f7;
    padding-bottom: 16px;
    margin-bottom: 24px;
}

.settings-header h3 {
    margin: 0;
    font-size: 1.25rem;
    font-weight: 800;
    color: var(--text-main);
}

#close-settings {
    background: none;
    border: none;
    font-size: 1.2rem;
    cursor: pointer;
    color: var(--text-sub);
    padding: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition-smooth);
}

#close-settings:hover {
    color: var(--accent-red);
    transform: scale(1.1);
}

/* 설정 아이템 그룹 */
.settings-body {
    display: flex;
    flex-direction: column;
    gap: 24px;
    flex-grow: 1;
}

.setting-item {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.setting-item label {
    font-size: 0.85rem;
    font-weight: 800;
    color: var(--text-sub);
    display: flex;
    align-items: center;
    gap: 4px;
}

/* 드롭다운 스타일 */
.setting-item select {
    width: 100%;
    padding: 12px;
    border-radius: 12px;
    border: 1.5px solid #e2e8f0;
    background-color: #fafbfc;
    font-family: inherit;
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--text-main);
    cursor: pointer;
    outline: none;
    transition: var(--transition-smooth);
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%232c3e50' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 14px center;
    padding-right: 36px;
}

.setting-item select:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(129, 178, 154, 0.15);
    background-color: #ffffff;
}

/* 슬라이더 스타일 */
.setting-item input[type="range"] {
    -webkit-appearance: none;
    width: 100%;
    height: 6px;
    border-radius: 5px;
    background: #edf2f7;
    outline: none;
    margin: 10px 0;
}

.setting-item input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--primary-color);
    cursor: pointer;
    box-shadow: 0 2px 5px rgba(0,0,0,0.15);
    transition: var(--transition-smooth);
}

.setting-item input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.15);
}

/* 테스트 발음 듣기 버튼 */
#btn-test-voice {
    background-color: #ebf5fb;
    color: #2980b9;
    border: 1.5px solid #d4e6f1;
    border-radius: 12px;
    padding: 12px;
    font-size: 0.95rem;
    font-weight: 800;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    transition: var(--transition-smooth);
    margin-top: 10px;
}

#btn-test-voice:hover {
    background-color: #d4e6f1;
    border-color: #a9cce3;
}

#btn-test-voice:active {
    transform: scale(0.98);
}

/* 🏷️ 하단 라이선스/소개 문구 (설정창 내부 하단) */
.settings-footer {
    font-size: 0.72rem;
    color: var(--text-hint);
    text-align: center;
    margin-top: auto;
    border-top: 1px solid #edf2f7;
    padding-top: 16px;
}

/* ==========================================================================
   🎬 애니메이션 효과 정의
   ========================================================================== */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(5px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes zoomIn {
    from { opacity: 0; transform: translate(-50%, -45%) scale(0.95); }
    to { opacity: 1; transform: translate(-50%, -50%) scale(1); }
}

/* ==========================================================================
   🗂️ 탭 네비게이션
   ========================================================================== */
.tabs-nav {
    display: flex;
    width: 92%;
    max-width: 450px;
    background-color: #edf2f7;
    border-radius: 14px;
    padding: 4px;
    margin-bottom: 2vh;
    gap: 4px;
}

.tab-btn {
    flex: 1;
    padding: 10px 6px;
    border: none;
    border-radius: 11px;
    background: transparent;
    font-family: inherit;
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--text-sub);
    cursor: pointer;
    transition: var(--transition-smooth);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 4px;
}

.tab-btn.active {
    background: var(--card-bg);
    color: var(--text-main);
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
}

.tab-badge {
    background: #e53935;
    color: #fff;
    font-size: 0.7rem;
    font-weight: 800;
    padding: 1px 6px;
    border-radius: 10px;
    min-width: 18px;
    text-align: center;
}

/* ==========================================================================
   ❓ 카드 내 액션 버튼 행 (스피커 + 메모)
   ========================================================================== */
.card-action-row {
    display: none;
    gap: 12px;
    margin-top: 20px;
    align-items: center;
    justify-content: center;
}

#btn-question-memo {
    font-size: 1.5rem;
    cursor: pointer;
    padding: 10px;
    background-color: #fef9e7;
    border: 2px solid #f9e79f;
    border-radius: 50%;
    width: 52px;
    height: 52px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition-smooth);
    box-shadow: 0 3px 8px rgba(249, 231, 159, 0.3);
}

#btn-question-memo:hover {
    transform: scale(1.1);
    background-color: #fcf3cf;
}

#btn-question-memo:active {
    transform: scale(0.95);
}

/* ==========================================================================
   📝 바텀시트 (Bottom Sheet)
   ========================================================================== */
.bottomsheet-overlay {
    position: fixed;
    top: 0; left: 0;
    width: 100vw; height: 100vh;
    background: rgba(0,0,0,0.4);
    backdrop-filter: blur(3px);
    -webkit-backdrop-filter: blur(3px);
    z-index: 3000;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
}

.bottomsheet-overlay.active {
    opacity: 1;
    pointer-events: auto;
}

.bottomsheet {
    position: fixed;
    bottom: 0; left: 0;
    width: 100%;
    max-height: 75vh;
    background: rgba(255,255,255,0.97);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-radius: 22px 22px 0 0;
    box-shadow: 0 -8px 30px rgba(0,0,0,0.1);
    z-index: 3001;
    transform: translateY(100%);
    transition: transform 0.35s cubic-bezier(0.25, 0.8, 0.25, 1);
    display: flex;
    flex-direction: column;
    padding: 0 20px 24px;
}

.bottomsheet.active {
    transform: translateY(0);
}

.bottomsheet-handle {
    width: 40px;
    height: 4px;
    background: #d1d5db;
    border-radius: 2px;
    margin: 10px auto 6px;
    flex-shrink: 0;
}

.bottomsheet-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 8px 0 12px;
    border-bottom: 1px solid #edf2f7;
    margin-bottom: 14px;
}

.bottomsheet-title {
    font-size: 1.1rem;
    font-weight: 800;
    color: var(--text-main);
}

.bottomsheet-close {
    background: none;
    border: none;
    font-size: 1.1rem;
    color: var(--text-sub);
    cursor: pointer;
    padding: 4px;
    transition: var(--transition-smooth);
}

.bottomsheet-close:hover { color: var(--accent-red); }

.bottomsheet-context {
    background: #f8f9fa;
    border-radius: 12px;
    padding: 12px 14px;
    margin-bottom: 14px;
}

.context-badge {
    font-size: 0.75rem;
    font-weight: 800;
    color: var(--text-sub);
    letter-spacing: 0.5px;
    text-transform: uppercase;
}

.context-ko {
    font-size: 0.92rem;
    color: var(--text-main);
    font-weight: 700;
    margin-top: 6px;
    line-height: 1.4;
}

.context-en {
    font-size: 0.85rem;
    color: #2980b9;
    font-weight: 600;
    margin-top: 4px;
    line-height: 1.4;
}

.question-textarea {
    width: 100%;
    border: 2px solid #e2e8f0;
    border-radius: 14px;
    padding: 14px;
    font-family: inherit;
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-main);
    resize: none;
    outline: none;
    transition: border-color 0.2s ease;
    background: #fafbfc;
    box-sizing: border-box;
}

.question-textarea:focus {
    border-color: #f9e79f;
    background: #fff;
    box-shadow: 0 0 0 3px rgba(249,231,159,0.3);
}

.bottomsheet-actions {
    display: flex;
    gap: 10px;
    margin-top: 14px;
}

.bs-btn {
    flex: 1;
    padding: 14px;
    border: none;
    border-radius: 12px;
    font-family: inherit;
    font-size: 1rem;
    font-weight: 800;
    cursor: pointer;
    transition: var(--transition-smooth);
}

.bs-cancel {
    background: #edf2f7;
    color: var(--text-sub);
}

.bs-save {
    background: #f39c12;
    color: #fff;
    box-shadow: 0 3px 0 #d68910;
}

.bs-save:active {
    transform: translateY(3px);
    box-shadow: 0 0 0 transparent;
}

/* ==========================================================================
   📋 질문 노트 뷰
   ========================================================================== */
#question-view {
    width: 92%;
    max-width: 450px;
    display: flex;
    flex-direction: column;
    align-items: center;
    flex-grow: 1;
    padding-bottom: 80px;
}

.filter-bar {
    display: flex;
    gap: 8px;
    width: 100%;
    margin-bottom: 16px;
    overflow-x: auto;
    padding: 2px 0;
}

.filter-chip {
    padding: 8px 14px;
    border: 1.5px solid #e2e8f0;
    border-radius: 20px;
    background: var(--card-bg);
    font-family: inherit;
    font-size: 0.82rem;
    font-weight: 700;
    color: var(--text-sub);
    cursor: pointer;
    white-space: nowrap;
    transition: var(--transition-smooth);
}

.filter-chip.active {
    background: var(--text-main);
    color: #fff;
    border-color: var(--text-main);
}

.question-list {
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

/* 개별 질문 카드 */
.q-card {
    background: var(--card-bg);
    border-radius: 16px;
    padding: 16px;
    box-shadow: var(--shadow-soft);
    border: 1px solid rgba(0,0,0,0.04);
    transition: var(--transition-smooth);
    animation: fadeIn 0.3s ease-out;
}

.q-card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 8px;
}

.q-card-tag {
    font-size: 0.72rem;
    font-weight: 800;
    color: var(--primary-color);
    background: #f1f8e9;
    padding: 3px 10px;
    border-radius: 8px;
    letter-spacing: 0.3px;
}

.q-card-date {
    font-size: 0.7rem;
    color: var(--text-hint);
    font-weight: 600;
}

.q-card-question {
    font-size: 1.05rem;
    font-weight: 800;
    color: var(--text-main);
    margin-bottom: 10px;
    line-height: 1.4;
    word-break: keep-all;
}

.q-card-sentence {
    background: #f8f9fa;
    border-radius: 10px;
    padding: 10px 12px;
    margin-bottom: 10px;
}

.q-card-ko {
    font-size: 0.82rem;
    color: var(--text-main);
    font-weight: 600;
}

.q-card-en {
    font-size: 0.8rem;
    color: #2980b9;
    font-weight: 600;
    margin-top: 3px;
}

.q-card-actions {
    display: flex;
    gap: 8px;
    justify-content: flex-end;
}

.q-action-btn {
    background: none;
    border: 1.5px solid #e2e8f0;
    border-radius: 8px;
    padding: 5px 12px;
    font-family: inherit;
    font-size: 0.78rem;
    font-weight: 700;
    color: var(--text-sub);
    cursor: pointer;
    transition: var(--transition-smooth);
}

.q-action-btn:hover {
    background: #f8f9fa;
}

.q-action-btn.copy:hover {
    border-color: #2c3e50;
    color: #2c3e50;
    background: #eef2f7;
}

.q-action-btn.delete:hover {
    border-color: #e53935;
    color: #e53935;
    background: #ffebee;
}

/* 빈 상태 */
.question-empty {
    text-align: center;
    padding: 60px 20px;
    width: 100%;
}

.empty-icon { font-size: 3rem; margin-bottom: 12px; }
.empty-title { font-size: 1.1rem; font-weight: 800; color: var(--text-main); margin-bottom: 8px; }
.empty-desc { font-size: 0.9rem; color: var(--text-hint); font-weight: 500; line-height: 1.5; }

/* 내보내기 바 */
.export-bar {
    position: fixed;
    bottom: 0; left: 0;
    width: 100%;
    padding: 12px 20px;
    padding-bottom: max(12px, env(safe-area-inset-bottom));
    background: rgba(255,255,255,0.95);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-top: 1px solid #edf2f7;
    display: flex;
    justify-content: center;
    z-index: 100;
}

.export-btn {
    width: 92%;
    max-width: 450px;
    padding: 15px;
    border: none;
    border-radius: 14px;
    background: linear-gradient(135deg, #2c3e50, #34495e);
    color: #fff;
    font-family: inherit;
    font-size: 1rem;
    font-weight: 800;
    cursor: pointer;
    transition: var(--transition-smooth);
    box-shadow: 0 4px 12px rgba(44,62,80,0.2);
}

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

/* 그룹 헤더 (일차별/동사별 정렬 시) */
.q-group-header {
    font-size: 0.85rem;
    font-weight: 800;
    color: var(--text-sub);
    padding: 8px 4px 4px;
    letter-spacing: 0.3px;
    border-bottom: 2px solid #edf2f7;
    margin-bottom: 4px;
}

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