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

:root {
    --primary: #E8612D;
    --primary-dark: #D3541F;
    --primary-rgb: 232, 97, 45;
    --secondary: #6c757d;
    --success: #28a745;
    --warning: #ffc107;
    --danger: #dc3545;
    --bg: #FFF8F5;
    --card-bg: #ffffff;
    --text: #333333;
    --text-light: #666666;
    --border: #f0e0d8;
    --shadow: 0 2px 12px rgba(var(--primary-rgb), 0.08);
    --radius: 12px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
}

/* Navbar */
.navbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 40px;
    height: 60px;
    background: var(--card-bg);
    box-shadow: 0 1px 4px rgba(0,0,0,0.06);
    position: sticky;
    top: 0;
    z-index: 100;
}

.logo {
    font-size: 22px;
    font-weight: 700;
    color: var(--primary);
    letter-spacing: 1px;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-light);
    margin-left: 32px;
    font-size: 15px;
    padding: 6px 0;
    border-bottom: 2px solid transparent;
    transition: all 0.2s;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--primary);
    border-bottom-color: var(--primary);
}

/* Container */
.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 30px 20px;
}

/* Pages */
.page {
    display: none;
}

.page.active {
    display: block;
    animation: fadeIn 0.3s ease;
}

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

@keyframes toastIn {
    from { opacity: 0; transform: translate(-50%, -50%) scale(0.8); }
    to { opacity: 1; transform: translate(-50%, -50%) scale(1); }
}

/* Hero */
.hero {
    text-align: center;
    padding: 40px 0 30px;
}

.hero h1 {
    font-size: 42px;
    color: var(--primary);
    margin-bottom: 8px;
}

.hero p {
    color: var(--text-light);
    font-size: 18px;
}

/* Stats Cards */
.stats-cards {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 16px;
    margin-bottom: 30px;
}

.stat-card {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 24px 16px;
    text-align: center;
    box-shadow: var(--shadow);
}

.stat-number {
    font-size: 32px;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 6px;
}

.stat-label {
    font-size: 14px;
    color: var(--text-light);
}

/* Quick Actions */
.quick-actions {
    display: flex;
    gap: 16px;
    justify-content: center;
    margin-top: 10px;
}

/* Settings Area */
.settings-area {
    display: flex;
    justify-content: center;
    margin-top: 30px;
    padding: 20px;
    background: var(--card-bg);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

.setting-item {
    display: flex;
    align-items: center;
    gap: 12px;
}

.setting-item label {
    font-size: 15px;
    color: var(--text);
    font-weight: 500;
}

.setting-item .input {
    width: 80px;
    text-align: center;
    padding: 8px 12px;
    border: 2px solid var(--border);
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    color: var(--primary);
    outline: none;
    transition: border 0.2s;
}

.setting-item .input:focus {
    border-color: var(--primary);
}

/* Switch 开关 */
.setting-switch {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 14px 16px;
    border: 2px solid var(--border);
    border-radius: var(--radius);
    cursor: pointer;
}

.setting-switch label {
    font-size: 15px;
    font-weight: 500;
    cursor: pointer;
}

.switch {
    position: relative;
    width: 48px;
    height: 26px;
    -webkit-appearance: none;
    appearance: none;
    background: #ccc;
    border-radius: 26px;
    cursor: pointer;
    outline: none;
    transition: background 0.3s;
    flex-shrink: 0;
    margin: 0;
    padding: 0;
    border: none;
}

.switch:checked {
    background: var(--primary);
}

.switch:before {
    content: '';
    position: absolute;
    top: 3px;
    left: 3px;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: #fff;
    transition: left 0.3s;
    box-shadow: 0 1px 3px rgba(0,0,0,0.2);
}

.switch:checked:before {
    left: 25px;
}

/* 主题色选择 */
.theme-swatches {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 14px;
}

.theme-swatch {
    width: 34px;
    height: 34px;
    border-radius: 50%;
    cursor: pointer;
    border: 2px solid transparent;
    box-shadow: 0 1px 4px rgba(0,0,0,0.15);
    transition: transform 0.15s;
}

.theme-swatch:hover {
    transform: scale(1.12);
}

.theme-swatch.active {
    border-color: #333;
}

.theme-custom {
    display: flex;
    align-items: center;
    gap: 12px;
}

.theme-custom label {
    font-size: 15px;
    font-weight: 500;
}

.theme-custom input[type="color"] {
    width: 52px;
    height: 34px;
    border: 2px solid var(--border);
    border-radius: 8px;
    padding: 2px;
    background: none;
    cursor: pointer;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 24px;
    border: none;
    border-radius: 8px;
    font-size: 15px;
    cursor: pointer;
    transition: all 0.2s;
    font-weight: 500;
}

.btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

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

.btn-primary {
    background: var(--primary);
    color: #fff;
}

.btn-primary:hover {
    background: var(--primary-dark);
}

.btn-secondary {
    background: var(--secondary);
    color: #fff;
}

.btn-success {
    background: var(--success);
    color: #fff;
}

.btn-warning {
    background: var(--warning);
    color: #333;
}

.btn-danger {
    background: var(--danger);
    color: #fff;
}

.btn-toggle-on {
    background: var(--danger);
    color: #fff;
}

.btn-toggle-on:hover {
    background: #c82333;
}

.btn-toggle-off {
    background: #c9c9c9;
    color: #fff;
}

.btn-toggle-off:hover {
    background: #b5b5b5;
}

.wordlist-disabled .wordlist-info {
    opacity: 0.5;
}

.btn-outline {
    background: transparent;
    color: var(--primary);
    border: 2px solid var(--primary);
}

.btn-outline:hover {
    background: var(--primary);
    color: #fff;
}

.btn-speak {
    background: var(--secondary);
    color: #fff;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    padding: 0;
    font-size: 16px;
    margin-bottom: 8px;
}

.btn-speak:hover {
    background: var(--primary);
    transform: scale(1.1);
}

.btn-lg {
    padding: 14px 36px;
    font-size: 17px;
    border-radius: 10px;
}

/* Page Header */
.page-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 24px;
}

.page-header h2 {
    font-size: 24px;
}

/* Import Area */
.upload-zone {
    border: 2px dashed var(--border);
    border-radius: var(--radius);
    padding: 50px 20px;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s;
    background: var(--card-bg);
}

.upload-zone:hover,
.upload-zone.dragover {
    border-color: var(--primary);
    background: rgba(var(--primary-rgb), 0.04);
}

.upload-icon {
    font-size: 48px;
    color: var(--primary);
    margin-bottom: 12px;
}

.upload-hint {
    color: var(--text-light);
    font-size: 13px;
    margin-top: 8px;
}

/* Import Preview */
.import-preview {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 24px;
    margin-top: 16px;
    box-shadow: var(--shadow);
}

.import-preview h3 {
    margin-bottom: 16px;
}

.preview-list {
    max-height: 200px;
    overflow-y: auto;
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 12px;
    margin-bottom: 16px;
    font-size: 14px;
    line-height: 1.8;
}

.preview-item {
    display: flex;
    gap: 12px;
}

.preview-item .en {
    font-weight: 600;
    min-width: 120px;
}

.preview-item .cn {
    color: var(--text-light);
}

.preview-actions {
    display: flex;
    gap: 12px;
    align-items: center;
}

.input {
    padding: 10px 16px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 15px;
    flex: 1;
    max-width: 240px;
    outline: none;
    transition: border 0.2s;
}

.input:focus {
    border-color: var(--primary);
}

/* Wordlist */
.wordlist-tip {
    font-size: 13px;
    color: var(--text-light);
    margin: -10px 0 16px;
    line-height: 1.5;
}

.wordlist-empty {
    text-align: center;
    padding: 60px 0;
    color: var(--text-light);
}

.wordlist-list {
    display: grid;
    gap: 16px;
}

.wordlist-item {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 20px 24px;
    box-shadow: var(--shadow);
    display: flex;
    align-items: center;
    justify-content: space-between;
    transition: transform 0.2s;
}

.wordlist-item:hover {
    transform: translateY(-2px);
}

.wordlist-info h3 {
    font-size: 18px;
    margin-bottom: 4px;
}

.wordlist-info p {
    color: var(--text-light);
    font-size: 14px;
}

.wordlist-actions {
    display: flex;
    gap: 8px;
}

.btn-sm {
    padding: 6px 16px;
    font-size: 13px;
}

/* Learn */
.learn-container {
    max-width: 500px;
    margin: 10px auto;
    text-align: center;
}

.learn-progress {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 12px;
}

.progress-bar {
    flex: 1;
    height: 8px;
    background: var(--border);
    border-radius: 4px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: var(--primary);
    border-radius: 4px;
    transition: width 0.3s;
    width: 0%;
}

#learn-progress-text {
    font-size: 14px;
    color: var(--text-light);
    white-space: nowrap;
}

/* Word Card */
.word-card {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 20px 20px;
    box-shadow: var(--shadow);
    margin-bottom: 12px;
    min-height: 160px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.word-english {
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--text);
}

.word-phonetic {
    font-size: 16px;
    color: var(--text-light);
    margin-bottom: 16px;
}

.word-chinese-hint {
    font-size: 13px;
    color: var(--text-light);
    margin-bottom: 6px;
}

.word-chinese {
    font-size: 22px;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 8px;
    line-height: 1.4;
}

.word-progress {
    font-size: 13px;
    color: var(--text-light);
    margin-bottom: 8px;
    padding: 3px 10px;
    background: rgba(var(--primary-rgb), 0.08);
    border-radius: 12px;
    display: inline-block;
}

/* Select Meaning Mode */
.word-en-display {
    font-size: 26px;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--text);
}

.options-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
    width: 100%;
    max-width: 500px;
}

.option-btn {
    padding: 12px;
    border: 2px solid var(--border);
    border-radius: var(--radius);
    background: var(--card-bg);
    cursor: pointer;
    font-size: 14px;
    text-align: left;
    transition: all 0.2s;
}

.option-btn:hover {
    border-color: var(--primary);
    background: rgba(var(--primary-rgb), 0.05);
}

.option-btn.correct {
    border-color: #22c55e;
    background: rgba(34, 197, 94, 0.1);
    color: #22c55e;
}

.option-btn.wrong {
    border-color: #ef4444;
    background: rgba(239, 68, 68, 0.1);
    color: #ef4444;
}

.option-btn:disabled {
    cursor: not-allowed;
    opacity: 0.7;
}

/* Context Mode */
.word-context {
    font-size: 16px;
    color: var(--text);
    margin-bottom: 12px;
    text-align: center;
    line-height: 1.5;
    padding: 12px;
    background: rgba(0, 0, 0, 0.02);
    border-radius: var(--radius);
    width: 100%;
    max-width: 500px;
}

.word-context .blank {
    display: inline-block;
    min-width: 100px;
    border-bottom: 2px dashed var(--primary);
    margin: 0 4px;
}

/* Input Row */
.input-row {
    display: flex;
    gap: 8px;
    align-items: center;
    margin-bottom: 8px;
}

.input-word {
    padding: 10px 16px;
    border: 2px solid var(--border);
    border-radius: 10px;
    font-size: 16px;
    width: 240px;
    outline: none;
    transition: border 0.2s;
    text-align: center;
}

.input-word:focus {
    border-color: var(--primary);
}

.input-word.correct {
    border-color: var(--success);
    background: rgba(40, 167, 69, 0.05);
}

.input-word.wrong {
    border-color: var(--danger);
    background: rgba(var(--primary-rgb), 0.08);
}

/* Answer Card */
.answer-card {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 40px 30px;
    box-shadow: var(--shadow);
    margin-bottom: 24px;
    text-align: center;
    animation: fadeIn 0.3s ease;
}

.answer-status {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 20px;
    padding: 8px 20px;
    border-radius: 20px;
    display: inline-block;
}

.answer-status.correct {
    background: rgba(40, 167, 69, 0.1);
    color: var(--success);
}

.answer-status.wrong {
    background: rgba(220, 53, 69, 0.1);
    color: var(--danger);
}

.answer-status.mastered {
    background: rgba(var(--primary-rgb), 0.1);
    color: var(--primary);
}

.answer-en {
    font-size: 36px;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 8px;
}

.answer-cn {
    font-size: 20px;
    color: var(--primary);
    margin-bottom: 12px;
}

.answer-progress {
    font-size: 14px;
    color: var(--text-light);
    margin-bottom: 24px;
    padding: 4px 12px;
    background: rgba(var(--primary-rgb), 0.08);
    border-radius: 12px;
    display: inline-block;
}

/* Learn Actions */
.learn-actions {
    display: flex;
    gap: 16px;
    justify-content: center;
}

/* Review */
.review-container {
    max-width: 500px;
    margin: 20px auto;
    text-align: center;
}

.review-stats {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
    margin: 24px 0;
}

.review-empty {
    padding: 40px 0;
    color: var(--text-light);
}

.review-card-area {
    margin-bottom: 24px;
}

/* Responsive */
@media (max-width: 640px) {
    .navbar {
        padding: 0 16px;
    }
    .nav-links a {
        margin-left: 16px;
        font-size: 14px;
    }
    .stats-cards {
        grid-template-columns: repeat(2, 1fr);
    }
    .hero h1 {
        font-size: 32px;
    }
    .quick-actions {
        flex-direction: column;
        align-items: center;
    }
    .learn-actions {
        flex-direction: column;
        align-items: center;
    }
    .preview-actions {
        flex-direction: column;
    }
}

/* Modal */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.5);
    z-index: 200;
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal {
    background: var(--card-bg);
    border-radius: var(--radius);
    width: 90%;
    max-width: 800px;
    max-height: 80vh;
    display: flex;
    flex-direction: column;
    box-shadow: 0 8px 32px rgba(0,0,0,0.2);
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px 24px;
    border-bottom: 1px solid var(--border);
}

.modal-header h3 {
    font-size: 18px;
}

.btn-close {
    background: none;
    border: none;
    font-size: 28px;
    cursor: pointer;
    color: var(--text-light);
    padding: 0;
    line-height: 1;
}

.btn-close:hover {
    color: var(--danger);
}

.modal-body {
    flex: 1;
    overflow-y: auto;
    padding: 16px 24px;
}

.modal-footer {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    padding: 16px 24px;
    border-top: 1px solid var(--border);
}

#modal-page-info {
    font-size: 14px;
    color: var(--text-light);
}

/* Word Modal Items */
.word-modal-item {
    display: flex;
    align-items: center;
    padding: 12px 0;
    border-bottom: 1px solid var(--border);
    gap: 10px;
}

.word-modal-index {
    font-size: 14px;
    color: var(--text-light);
    min-width: 24px;
    text-align: right;
    flex-shrink: 0;
}

.word-modal-item:last-child {
    border-bottom: none;
}

.word-modal-en {
    font-size: 16px;
    font-weight: 600;
    min-width: 80px;
    flex-shrink: 0;
}

.word-modal-cn {
    font-size: 14px;
    color: var(--text-light);
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.word-modal-progress {
    font-size: 13px;
    color: var(--primary);
    font-weight: 600;
    min-width: 36px;
    flex-shrink: 0;
}

.word-modal-review {
    font-size: 12px;
    color: var(--text-light);
    min-width: 100px;
    flex-shrink: 0;
}

.word-modal-speak {
    background: var(--secondary);
    color: #fff;
    border: none;
    width: 30px;
    height: 30px;
    border-radius: 50%;
    cursor: pointer;
    font-size: 13px;
    flex-shrink: 0;
    padding: 0;
}

.word-modal-speak:hover {
    background: var(--primary);
}

.stat-card {
    cursor: pointer;
}

.stat-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 16px rgba(0,0,0,0.12);
}

/* Page Title */
.page-title {
    font-size: 18px;
    color: var(--primary);
    text-align: center;
    margin-bottom: 10px;
    padding-bottom: 8px;
    border-bottom: 2px solid var(--border);
}

/* Understand Page */
.understand-card {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 40px 30px;
    box-shadow: var(--shadow);
    margin-bottom: 20px;
    text-align: center;
}

.understand-word {
    font-size: 42px;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 12px;
}

.understand-info {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 24px;
    box-shadow: var(--shadow);
    text-align: left;
    max-height: 300px;
    overflow-y: auto;
    word-wrap: break-word;
    overflow-wrap: break-word;
}

.understand-row {
    display: flex;
    padding: 12px 0;
    border-bottom: 1px solid var(--border);
    word-wrap: break-word;
    overflow-wrap: break-word;
}

.understand-row:last-child {
    border-bottom: none;
}

.understand-label {
    font-size: 15px;
    font-weight: 600;
    color: var(--text);
    min-width: 60px;
    flex-shrink: 0;
}

.understand-value {
    font-size: 15px;
    color: var(--text-light);
    flex: 1;
    word-wrap: break-word;
    overflow-wrap: break-word;
}

#understand-collins {
    color: #f5a623;
    letter-spacing: 2px;
}

.understand-wrong {
    margin-top: 12px;
    padding: 10px 14px;
    background: rgba(220, 53, 69, 0.08);
    border-radius: var(--radius);
    font-size: 15px;
    color: var(--danger);
    text-align: center;
    word-wrap: break-word;
    overflow-wrap: break-word;
}

.understand-wrong .uw-label {
    color: var(--text-light);
    font-size: 13px;
}

/* ========== 词书预览 ========== */
.pvw-container {
    max-width: 700px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    height: calc(100vh - 130px);
}

.pvw-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 12px;
    flex-shrink: 0;
}

.pvw-title {
    font-size: 18px;
    font-weight: 700;
    color: var(--text);
}

.pvw-detail {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 16px;
    box-shadow: var(--shadow);
    margin-bottom: 12px;
    text-align: left;
    flex-shrink: 0;
}

.pvw-hint {
    font-size: 13px;
    color: var(--text-light);
    text-align: center;
    margin: 6px 0;
}

.pvw-word {
    font-size: 24px;
    font-weight: 700;
    color: var(--primary);
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 10px;
}

.pvw-speak-btn {
    background: var(--secondary);
    color: #fff;
    border: none;
    width: 34px;
    height: 34px;
    border-radius: 50%;
    font-size: 15px;
    cursor: pointer;
    padding: 0;
}

.pvw-speak-btn:hover {
    background: var(--primary);
}

.pvw-row {
    display: flex;
    padding: 5px 0;
    font-size: 14px;
}

.pvw-label {
    color: var(--text-light);
    min-width: 52px;
    flex-shrink: 0;
}

.pvw-val {
    color: var(--text);
    flex: 1;
    word-wrap: break-word;
    overflow-wrap: break-word;
}

.pvw-collins {
    color: #f5a623;
    letter-spacing: 2px;
}

.pvw-list {
    flex: 1;
    min-height: 0;
    overflow-y: auto;
    background: var(--card-bg);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

.pvw-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 14px;
    border-bottom: 1px solid var(--border);
    cursor: pointer;
}

.pvw-item:hover {
    background: rgba(var(--primary-rgb), 0.06);
}

.pvw-en {
    font-size: 15px;
    font-weight: 600;
    min-width: 100px;
    flex-shrink: 0;
}

.pvw-cn {
    font-size: 13px;
    color: var(--text-light);
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.pvw-speak {
    flex-shrink: 0;
    font-size: 15px;
    cursor: pointer;
    opacity: 0.6;
}

.pvw-speak:hover {
    opacity: 1;
}

.wordlist-actions {
    flex-wrap: wrap;
    justify-content: flex-end;
}

/* ========== 例句展示 ========== */
.ex-item {
    margin-bottom: 8px;
}

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

.ex-en {
    font-size: 14px;
    color: var(--text);
    line-height: 1.5;
}

.ex-cn {
    font-size: 12px;
    color: var(--text-light);
    margin-top: 2px;
    line-height: 1.5;
}

.ctx-cn {
    font-size: 13px;
    color: var(--text-light);
    margin-top: 8px;
    line-height: 1.5;
}

/* Settings Page */
.settings-container {
    max-width: 600px;
    margin: 0 auto;
}

.settings-card {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 24px;
    box-shadow: var(--shadow);
}

.setting-group {
    margin-bottom: 24px;
}

.setting-group:last-child {
    margin-bottom: 0;
}

.setting-group-title {
    font-size: 18px;
    color: var(--text);
    margin-bottom: 16px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--border);
}

.mode-options {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.mode-option {
    cursor: pointer;
}

.mode-option input[type="radio"] {
    display: none;
}

.mode-card {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px;
    border: 2px solid var(--border);
    border-radius: var(--radius);
    transition: all 0.2s;
}

.mode-option input[type="radio"]:checked + .mode-card {
    border-color: var(--primary);
    background: rgba(var(--primary-rgb), 0.05);
}

.mode-card:hover {
    border-color: var(--primary);
}

.mode-icon {
    font-size: 24px;
}

.mode-name {
    font-size: 16px;
    font-weight: 600;
    color: var(--text);
    min-width: 80px;
}

.mode-desc {
    font-size: 14px;
    color: var(--text-light);
}

/* 测试复习区域 */
.test-review-area {
    margin-top: 20px;
    padding: 16px;
    background: var(--card-bg);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

.test-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 12px;
    align-items: center;
}

.test-label {
    font-size: 14px;
    color: var(--text);
    margin-right: 8px;
}

.test-buttons .btn {
    padding: 6px 12px;
    font-size: 13px;
}

.test-actions {
    margin-bottom: 12px;
}

.review-list {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 14px;
    line-height: 1.6;
    resize: vertical;
    background: var(--bg);
    color: var(--text);
}

/* Mobile: compact layout when keyboard may appear */
@media (max-width: 600px) {
    .navbar {
        padding: 0 16px;
        height: 48px;
    }
    .logo {
        font-size: 18px;
    }
    .nav-links a {
        margin-left: 16px;
        font-size: 13px;
    }
    .container {
        padding: 12px 12px;
    }
    .learn-container {
        margin: 6px auto;
    }
    .word-card {
        padding: 16px 14px;
        margin-bottom: 8px;
        min-height: 140px;
    }
    .word-chinese {
        font-size: 20px;
        margin-bottom: 6px;
    }
    .word-chinese-hint {
        font-size: 12px;
        margin-bottom: 4px;
    }
    .word-progress {
        font-size: 12px;
        margin-bottom: 6px;
    }
    .btn-speak {
        width: 32px;
        height: 32px;
        font-size: 14px;
        margin-bottom: 6px;
    }
    .input-word {
        padding: 8px 12px;
        font-size: 15px;
        width: 200px;
    }
    .input-row {
        gap: 6px;
        margin-bottom: 6px;
    }
    .btn-primary {
        padding: 8px 18px;
        font-size: 14px;
    }
    .word-en-display {
        font-size: 22px;
        margin-bottom: 8px;
    }
    .option-btn {
        padding: 10px;
        font-size: 13px;
    }
    .word-context {
        font-size: 15px;
        padding: 10px;
        margin-bottom: 8px;
    }
    #btn-learn-back {
        margin-top: 10px !important;
        padding: 8px 24px;
        font-size: 14px;
    }
    .page-title {
        font-size: 16px;
        margin-bottom: 8px;
        padding-bottom: 6px;
    }
    .learn-progress {
        margin-bottom: 8px;
    }

    /* Modal word list - mobile */
    .modal {
        width: 95%;
        max-height: 85vh;
    }
    .modal-header {
        padding: 14px 16px;
    }
    .modal-header h3 {
        font-size: 16px;
    }
    .btn-close {
        font-size: 24px;
    }
    .modal-body {
        padding: 8px 12px;
    }
    .word-modal-item {
        padding: 8px 0;
        gap: 6px;
        flex-wrap: wrap;
    }
    .word-modal-index {
        font-size: 12px;
        min-width: 18px;
    }
    .word-modal-speak {
        width: 26px;
        height: 26px;
        font-size: 12px;
    }
    .word-modal-en {
        font-size: 14px;
        min-width: 0;
    }
    .word-modal-cn {
        flex-basis: 100%;
        order: 10;
        font-size: 13px;
        margin-left: 24px;
        white-space: normal;
        overflow: hidden;
        text-overflow: ellipsis;
        display: -webkit-box;
        -webkit-line-clamp: 2;
        -webkit-box-orient: vertical;
    }
    .word-modal-progress {
        font-size: 12px;
        min-width: 0;
    }
    .word-modal-review {
        display: none;
    }
    .modal-footer {
        padding: 10px 16px;
        gap: 10px;
    }
    .modal-footer .btn {
        padding: 8px 16px;
        font-size: 13px;
    }
}

/* ========== 打卡日历 ========== */
.calendar-container {
    max-width: 520px;
    margin: 0 auto;
}

.calendar-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 16px;
}

.calendar-title {
    font-size: 18px;
    font-weight: 700;
    color: var(--primary);
}

.calendar-weekdays {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    text-align: center;
    font-size: 13px;
    color: var(--text-light);
    margin-bottom: 8px;
}

.calendar-grid {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 4px;
}

.cal-cell {
    position: relative;
    min-height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--card-bg);
    border-radius: 8px;
    cursor: pointer;
    font-size: 14px;
    color: var(--text);
    transition: background 0.15s, transform 0.15s;
    border: 2px solid transparent;
}

.cal-cell.empty {
    background: transparent;
    cursor: default;
}

.cal-cell:hover:not(.empty) {
    background: rgba(var(--primary-rgb), 0.1);
}

.cal-cell.today {
    border-color: var(--primary);
    font-weight: 700;
    color: var(--primary);
}

.cal-cell.selected {
    background: var(--primary);
    color: #fff;
}

.cal-cell.selected .cal-day {
    color: #fff;
}

.cal-check {
    position: absolute;
    bottom: 1px;
    right: 4px;
    font-size: 10px;
    line-height: 1;
    color: var(--success);
    font-weight: 700;
}

.cal-cell.selected .cal-check {
    color: #fff;
}

.calendar-summary {
    margin-top: 20px;
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 16px;
    box-shadow: var(--shadow);
    text-align: center;
}

.calendar-hint {
    font-size: 13px;
    color: var(--text-light);
    margin-top: 10px;
}

.cal-summary-title {
    font-size: 16px;
    font-weight: 700;
    margin-bottom: 14px;
    color: var(--text);
}

.cal-stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 8px;
}

.cal-stat {
    padding: 12px 4px;
    border-radius: 10px;
    background: rgba(var(--primary-rgb), 0.06);
    cursor: pointer;
    transition: background 0.15s;
}

.cal-stat:hover {
    background: rgba(var(--primary-rgb), 0.16);
}

.cal-stat.no-click {
    cursor: default;
}

.cal-stat.no-click:hover {
    background: rgba(var(--primary-rgb), 0.06);
}

.cal-stat-num {
    font-size: 22px;
    font-weight: 700;
    color: var(--primary);
}

.cal-stat-time {
    font-size: 16px;
    line-height: 28px;
}

.cal-stat-label {
    font-size: 12px;
    color: var(--text-light);
    margin-top: 2px;
}

/* 首页今日学习时长 */
.today-duration {
    text-align: center;
    font-size: 15px;
    color: var(--text-light);
    margin: 4px 0 18px;
}

.today-duration span {
    color: var(--primary);
    font-weight: 700;
}

/* ========== 学习页自定义键盘 ========== */
.osk {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 300;
    background: var(--card-bg);
    box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.12);
    padding: 6px 4px calc(6px + env(safe-area-inset-bottom, 0px));
    user-select: none;
    -webkit-user-select: none;
}

.osk-row {
    display: flex;
    justify-content: center;
    gap: 5px;
    margin-bottom: 5px;
}

.osk-row:last-child {
    margin-bottom: 0;
}

.osk-key {
    flex: 1 1 0;
    min-width: 0;
    height: 44px;
    border: none;
    border-radius: 6px;
    background: #ececec;
    color: var(--text);
    font-size: 17px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0;
}

.osk-key:active {
    background: #d8d8d8;
}

.osk-key.wide {
    flex: 1.6 1 0;
    font-size: 12px;
}

.osk-key.space {
    flex: 1 1 0;
    max-width: 75%;
    font-size: 15px;
}

.osk-key.submit {
    flex: 1 1 0;
    max-width: 75%;
    background: var(--primary);
    color: #fff;
    font-size: 16px;
}

body.osk-open .learn-container {
    padding-bottom: 235px;
}

/* ========== 登录浮层 ========== */
.login-overlay {
    position: fixed;
    inset: 0;
    z-index: 1000;
    background: rgba(0, 0, 0, 0.55);
    display: flex;
    align-items: center;
    justify-content: center;
}

.login-box {
    background: var(--card-bg);
    border-radius: 16px;
    padding: 32px 28px;
    width: 88%;
    max-width: 320px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.25);
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.login-title {
    color: var(--primary);
    font-size: 26px;
    text-align: center;
    margin: 0;
    letter-spacing: 2px;
}

.login-sub {
    color: var(--text-light);
    text-align: center;
    font-size: 14px;
    margin: -6px 0 4px;
}

.login-input {
    width: 100%;
    padding: 12px 14px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 16px;
    box-sizing: border-box;
    outline: none;
}

.login-input:focus {
    border-color: var(--primary);
}

.login-error {
    color: var(--danger);
    font-size: 13px;
    text-align: center;
    min-height: 18px;
    margin: 0;
}