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

:root {
    --primary: #4A90E2; --primary-light: #7AB8FF; --primary-dark: #2C6FBE;
    --success: #52C41A; --error: #FF4D4F; --warning: #FAAD14; --info: #1890FF;
    --bg-primary: #F0F8FF; --bg-secondary: #FFFFFF; --bg-accent: #FFF7E6;
    --text-primary: #262626; --text-secondary: #595959; --text-light: #8C8C8C;
    --rainbow-1: #FF6B6B; --rainbow-2: #FFA94D; --rainbow-3: #FFD93D;
    --rainbow-4: #6BCB77; --rainbow-5: #4D96FF;
    --shadow: 0 4px 12px rgba(0,0,0,0.1); --shadow-hover: 0 8px 20px rgba(0,0,0,0.15);
}

body {
    font-family: 'Comic Sans MS', 'Chalkboard SE', 'Marker Felt', cursive, sans-serif;
    font-size: 18px; line-height: 1.6; color: var(--text-primary);
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh; padding: 15px;
}

#app { max-width: 1000px; margin: 0 auto; min-height: calc(100vh - 30px); display: flex; flex-direction: column; }
.app-main { flex: 1; display: flex; flex-direction: column; }

.app-header {
    background: var(--bg-secondary); border-radius: 20px; padding: 20px 30px;
    margin-bottom: 15px; box-shadow: var(--shadow);
}

.app-header-top {
    display: flex; align-items: center; justify-content: space-between;
    flex-wrap: wrap; gap: 15px; margin-bottom: 10px;
}

.app-header h1 {
    font-size: 28px;
    background: linear-gradient(45deg, var(--rainbow-1), var(--rainbow-2), var(--rainbow-3), var(--rainbow-4), var(--rainbow-5));
    -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}

.group-selector {
    display: flex; align-items: center; gap: 10px; flex-wrap: wrap;
}

.group-selector select {
    padding: 10px 16px; border: 2px solid var(--primary-light); border-radius: 12px;
    font-size: 16px; font-family: inherit; background: var(--bg-primary);
    cursor: pointer; min-width: 180px;
}

.group-selector select:focus { outline: none; border-color: var(--primary); }

.group-btn {
    background: var(--success); color: white; border: none; padding: 10px 18px;
    border-radius: 12px; font-size: 14px; cursor: pointer; transition: all 0.3s ease; font-family: inherit;
}

.group-btn:hover { transform: translateY(-2px); box-shadow: var(--shadow); }

.group-btn.rename { background: var(--info); }
.group-btn.delete { background: var(--error); }

.nav-buttons { display: flex; gap: 10px; flex-wrap: wrap; }

.nav-btn {
    background: var(--bg-primary); border: none; padding: 10px 18px;
    border-radius: 12px; font-size: 16px; cursor: pointer;
    transition: all 0.3s ease; font-family: inherit;
}

.nav-btn:hover { background: var(--primary-light); color: white; transform: translateY(-2px); }
.nav-btn.active { background: var(--primary); color: white; }

.view { display: none; animation: fadeIn 0.3s ease-in-out; }
.view.active { display: flex; flex-direction: column; flex: 1; }
#texts-view.active { display: flex; flex-direction: column; flex: 1; }
#texts-view.active > .card { flex: 1; display: flex; flex-direction: column; }

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

.card {
    background: var(--bg-secondary); border-radius: 20px; padding: 25px;
    margin-bottom: 15px; box-shadow: var(--shadow);
}

.card h2 { font-size: 24px; margin-bottom: 15px; color: var(--primary); }
.card h3 { font-size: 20px; margin-bottom: 15px; color: var(--text-secondary); }

.btn {
    background: var(--primary); color: white; border: none; padding: 14px 28px;
    border-radius: 14px; font-size: 18px; cursor: pointer; transition: all 0.3s ease;
    font-family: inherit; display: inline-flex; align-items: center; gap: 8px; min-height: 48px;
}

.btn:hover { transform: translateY(-3px); box-shadow: var(--shadow-hover); }
.btn:active { transform: scale(0.95); }
.btn-success { background: var(--success); }
.btn-warning { background: var(--warning); }
.btn-error { background: var(--error); }
.btn-info { background: var(--info); }
.btn-sm { padding: 8px 16px; font-size: 14px; min-height: 36px; }
.fill-diff-btn { padding: 10px 20px; font-size: 14px; opacity: 0.6; }
.fill-diff-btn.active { opacity: 1; box-shadow: 0 0 0 3px rgba(24, 144, 255, 0.3); }
.dictation-mode-btn { padding: 10px 20px; font-size: 14px; opacity: 0.6; background: var(--rainbow-4) !important; }
.dictation-mode-btn.active { opacity: 1; background: var(--primary) !important; box-shadow: 0 0 0 3px rgba(24, 144, 255, 0.3); }

.btn-group { display: flex; gap: 15px; flex-wrap: wrap; }

textarea {
    width: 100%; min-height: 200px; padding: 15px;
    border: 3px solid var(--primary-light); border-radius: 14px;
    font-size: 18px; font-family: inherit; resize: vertical; transition: border-color 0.3s;
}

textarea:focus { outline: none; border-color: var(--primary); }

input[type="text"], input[type="number"] {
    padding: 12px 16px; border: 3px solid var(--primary-light); border-radius: 12px;
    font-size: 18px; font-family: inherit; transition: border-color 0.3s; width: 100%;
}

input:focus { outline: none; border-color: var(--primary); }

.import-preview { margin-top: 20px; max-height: 300px; overflow-y: auto; }

.word-item {
    display: flex; align-items: center; gap: 12px; padding: 12px 16px;
    background: var(--bg-primary); border-radius: 12px; margin-bottom: 10px; transition: all 0.3s;
}

.word-item:hover { transform: translateX(5px); }
.word-item .english { font-weight: bold; color: var(--primary); font-size: 20px; }
.word-item .chinese { color: var(--text-secondary); }

.mode-cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 15px; }

.mode-card {
    background: var(--bg-secondary); border-radius: 20px; padding: 20px;
    text-align: center; box-shadow: var(--shadow); transition: all 0.3s; cursor: pointer;
}

.mode-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-hover); }
.mode-card .icon { font-size: 48px; margin-bottom: 10px; }
.mode-card h3 { font-size: 18px; margin-bottom: 6px; }
.mode-card p { color: var(--text-secondary); font-size: 14px; }
.mode-card.quiz { border-top: 5px solid var(--rainbow-1); }
.mode-card.dictation { border-top: 5px solid var(--rainbow-4); }
.mode-card.manage { border-top: 5px solid var(--rainbow-5); }

.quiz-container { text-align: center; }

.progress-bar {
    background: var(--bg-primary); border-radius: 20px; height: 24px;
    margin-bottom: 20px; overflow: hidden;
}

.progress-fill {
    background: linear-gradient(90deg, var(--rainbow-4), var(--rainbow-3));
    height: 100%; transition: width 0.3s ease; border-radius: 20px;
}

.progress-text { margin-bottom: 20px; font-size: 18px; color: var(--text-secondary); }
.question-word { font-size: 48px; color: var(--primary); margin: 30px 0; font-weight: bold; }
.options { display: grid; grid-template-columns: repeat(2, 1fr); gap: 15px; margin: 30px 0; }

.option-btn {
    background: var(--bg-primary); border: 3px solid transparent; padding: 20px;
    border-radius: 16px; font-size: 20px; cursor: pointer; transition: all 0.3s;
    font-family: inherit; min-height: 60px;
}

.option-btn:hover:not(:disabled) { border-color: var(--primary); transform: scale(1.02); }
.option-btn.correct { background: var(--success); color: white; border-color: var(--success); }
.option-btn.wrong { background: var(--error); color: white; border-color: var(--error); }

.feedback { font-size: 28px; margin: 20px 0; animation: bounce 0.5s ease; }

@keyframes bounce {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.2); }
}

.score-display { font-size: 36px; margin: 30px 0; }
.result-message { font-size: 24px; margin: 20px 0; color: var(--success); }
.dictation-list { margin: 20px 0; }

.dictation-item {
    display: grid; grid-template-columns: 40px 1fr 1fr; align-items: center; gap: 15px;
    padding: 20px; background: var(--bg-primary); border-radius: 12px;
    margin-bottom: 15px; border-left: 5px solid var(--rainbow-2);
}

.dictation-item .prompt { font-size: 24px; color: var(--text-primary); }
.dictation-item .answer { font-size: 24px; color: var(--success); font-weight: bold; }

.dictation-item .number {
    width: 32px; height: 32px; line-height: 32px; text-align: center;
    background: linear-gradient(135deg, var(--rainbow-4), var(--rainbow-5));
    color: white; border-radius: 50%; font-size: 14px; font-weight: bold;
}

/* 20个以上单词双列布局 */
.dictation-list.two-columns {
    display: grid; grid-template-columns: 1fr 1fr; gap: 0 15px;
}
.dictation-list.two-columns .dictation-item {
    padding: 12px 15px; margin-bottom: 8px;
}
.dictation-list.two-columns .dictation-item .prompt { font-size: 18px; }
.dictation-list.two-columns .dictation-item .answer { font-size: 18px; }
.dictation-list.two-columns .dictation-item .number {
    width: 26px; height: 26px; line-height: 26px; font-size: 12px;
}

.fill-item {
    display: flex; align-items: center; gap: 15px; padding: 20px;
    background: var(--bg-primary); border-radius: 12px;
    margin-bottom: 15px; border-left: 5px solid var(--rainbow-2);
    flex-wrap: wrap;
}

.fill-item .number {
    width: 32px; height: 32px; line-height: 32px; text-align: center;
    background: linear-gradient(135deg, var(--rainbow-2), var(--rainbow-3));
    color: white; border-radius: 50%; font-size: 14px; font-weight: bold; flex-shrink: 0;
}

.fill-item .word-display { font-size: 28px; font-weight: bold; color: var(--primary); letter-spacing: 4px; flex: 1; }
.fill-item .chinese-display { font-size: 18px; color: var(--text-secondary); min-width: 100px; }

.fill-input {
    width: 60px; padding: 8px; border: 3px solid var(--primary-light); border-radius: 10px;
    font-size: 24px; font-family: inherit; text-align: center; text-transform: lowercase;
}

.fill-input:focus { outline: none; border-color: var(--primary); }
.fill-input.correct { border-color: var(--success); background: #f6ffed; }
.fill-input.wrong { border-color: var(--error); background: #fff2f0; }

.fill-result { font-size: 24px; margin-top: 10px; }

.dictation-item .number {
    width: 26px; height: 26px; line-height: 26px; text-align: center;
    background: linear-gradient(135deg, var(--rainbow-4), var(--rainbow-5));
    color: white; border-radius: 50%; font-size: 12px; font-weight: bold;
}

.search-box { margin-bottom: 20px; }
.word-list { max-height: 500px; overflow-y: auto; }

.word-row {
    display: flex; align-items: center; gap: 15px; padding: 12px;
    background: var(--bg-primary); border-radius: 12px; margin-bottom: 10px; transition: all 0.3s;
}

.word-row:hover { transform: translateX(5px); }
.word-row.starred { background: var(--bg-accent); border: 2px solid var(--warning); }
.word-row.selected { background: #E6F7FF; border: 2px solid var(--primary); }
.word-row.wrong { background: #FFF1F0; border: 2px solid var(--error); }
.word-row.selected.starred { background: linear-gradient(135deg, #FFF7E6, #E6F7FF); }

.checkbox-btn {
    background: none; border: 2px solid #ccc; width: 24px; height: 24px;
    border-radius: 6px; cursor: pointer; transition: all 0.3s; flex-shrink: 0;
    display: flex; align-items: center; justify-content: center; font-size: 14px;
}

.checkbox-btn.checked { background: var(--primary); border-color: var(--primary); color: white; }

.star-btn {
    background: none; border: none; font-size: 28px; cursor: pointer;
    transition: transform 0.3s; min-width: 40px;
}

.star-btn:hover { transform: scale(1.2); }
.word-info { flex: 1; }
.word-info .english { font-weight: bold; color: var(--primary); font-size: 20px; }
.word-info .chinese { color: var(--text-secondary); }

.speaker-group {
    display: inline-flex; align-items: center; gap: 6px;
}

.speaker-item {
    display: inline-flex; align-items: center; gap: 3px;
    background: var(--bg-primary); border-radius: 20px;
    padding: 3px 8px 3px 3px; cursor: pointer;
    transition: all 0.2s; border: 2px solid transparent;
}

.speaker-item:hover { border-color: var(--primary-light); background: #E6F3FF; }

.speaker-item .icon { font-size: 20px; }

.speaker-item .tag {
    font-size: 11px; font-weight: bold; padding: 1px 6px;
    border-radius: 10px; color: white; line-height: 1.4;
}

.speaker-item .tag.us { background: linear-gradient(135deg, #FF6B6B, #ee5a5a); }
.speaker-item .tag.uk { background: linear-gradient(135deg, #4D96FF, #3a7fe0); }

.empty-state { text-align: center; padding: 60px 20px; color: var(--text-light); }
.empty-state .icon { font-size: 64px; margin-bottom: 15px; }

.stats { display: flex; gap: 20px; justify-content: center; flex-wrap: wrap; margin: 10px 0; }

.stat-item { background: var(--bg-primary); padding: 15px 25px; border-radius: 14px; text-align: center; }
.stat-item .number { font-size: 32px; font-weight: bold; color: var(--primary); }
.stat-item .label { font-size: 14px; color: var(--text-secondary); }

.modal {
    display: none; position: fixed; top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(0,0,0,0.5); z-index: 1000;
    justify-content: center; align-items: center;
}

.modal.active { display: flex; }

.modal-content {
    background: var(--bg-secondary); border-radius: 20px; padding: 30px;
    max-width: 500px; width: 90%; text-align: center; animation: scaleIn 0.3s ease;
}

@keyframes scaleIn {
    from { transform: scale(0.8); opacity: 0; }
    to { transform: scale(1); opacity: 1; }
}

.alert { padding: 15px 20px; border-radius: 12px; margin-bottom: 15px; display: none; }
.alert-success { background: #f6ffed; border: 2px solid var(--success); color: var(--success); }
.alert-error { background: #fff2f0; border: 2px solid var(--error); color: var(--error); }
.alert.show { display: block; animation: fadeIn 0.3s; }

@media print {
    * { -webkit-print-color-adjust: exact !important; print-color-adjust: exact !important; }
    body { background: white !important; padding: 10px !important; margin: 0 !important; font-size: 14px !important; }
    .app-header, .nav-buttons, .btn-group, .dictation-setup, .no-print, .screen-only { display: none !important; }
    .view:not(#dictation-view):not(#texts-view) { display: none !important; }
    #dictation-view { display: block !important; }
    #dictation-view > .card { box-shadow: none !important; border: none !important; padding: 0 !important; margin: 0 !important; }
    #texts-view { display: block !important; }
    #texts-view > .card { box-shadow: none !important; border: none !important; padding: 0 !important; margin: 0 !important; }
    #texts-view #texts-list-container,
    #texts-view #text-editor,
    #texts-view #text-reader,
    #texts-view #text-follow,
    #texts-view #text-practice,
    #texts-view #text-print-preview { display: none !important; }
    /* 完形填空打印样式 - 只在可见时生效 */
    #texts-view #text-practice[style*="block"] { display: block !important; }
    #texts-view #text-practice[style*="block"] > p { display: none !important; }
    #texts-view #text-practice[style*="block"] .btn-group { display: none !important; }
    #texts-view #text-practice[style*="block"] #practice-result { display: none !important; }
    #texts-view #text-practice[style*="block"] .text-practice-content { font-size: 16px !important; line-height: 2.2 !important; }
    #texts-view #text-practice[style*="block"] .text-practice-content .blank-input {
        border: none !important;
        border-bottom: 1px solid #999 !important;
        border-radius: 0 !important;
        background: transparent !important;
        width: 80px !important;
    }
    /* 默写打印预览样式 - 只在可见时生效 */
    #texts-view #text-print-preview[style*="block"] { display: block !important; }
    #texts-view #text-print-preview[style*="block"] .btn-group { display: none !important; }
    #texts-view #text-print-preview[style*="block"] .dictation-mode-btn { display: none !important; }
    .card h2, .card h3, .card > p { display: none !important; }
    .dictation-list { margin: 0 !important; }
    .dictation-list.two-columns { grid-template-columns: 1fr 1fr !important; }
    .dictation-item {
        page-break-inside: avoid; border-bottom: 1px dashed #999;
        padding: 6px 5px !important; margin-bottom: 3px !important;
        border-left: none !important; border-radius: 0 !important;
        background: white !important; grid-template-columns: 25px 1fr 1fr !important; gap: 5px !important;
    }
    .dictation-item .number {
        background: none !important; color: #333; width: auto !important; height: auto !important;
        line-height: normal !important; border-radius: 0 !important; font-size: 13px !important; font-weight: bold;
    }
    .dictation-item .prompt { font-size: 14px !important; color: #333 !important; }
    .dictation-item .answer { display: none !important; }
    .print-title { display: block !important; text-align: center; font-size: 18px; margin-bottom: 10px; font-weight: bold; }
    .print-unit { display: block !important; text-align: center; font-size: 14px; margin-bottom: 8px; color: var(--primary); }
    .text-print-item {
        page-break-inside: avoid;
        border: 1px solid #ddd !important;
        grid-template-columns: 25px 1fr 1fr !important;
    }
    .text-print-item .print-number {
        background: none !important;
        color: #333 !important;
        font-size: 13px !important;
    }
    .text-print-item .print-prompt { font-size: 14px !important; color: #333 !important; }
    .text-print-item .print-answer { display: none !important; }
    .text-print-item .print-blank { display: block !important; border-bottom: 2px dashed #999; }
    /* 段落分组打印样式（汉译英） */
    .text-print-paragraph {
        page-break-inside: avoid;
        border: 1px solid #ddd !important;
    }
    .text-print-paragraph .print-number {
        background: none !important;
        color: #333 !important;
        font-size: 13px !important;
    }
    .text-print-paragraph .paragraph-prompt { font-size: 14px !important; color: #333 !important; }
    .text-print-paragraph .paragraph-answer { display: none !important; }
    .text-print-paragraph .paragraph-blanks { display: flex !important; }
    .text-print-paragraph .blank-line { border-bottom: 2px dashed #999 !important; }
}

.print-title { display: none; }
.print-unit { display: none; }

@media (max-width: 768px) {
    body { padding: 10px; font-size: 16px; }
    .app-header h1 { font-size: 22px; }
    .options { grid-template-columns: 1fr; }
    .mode-cards { grid-template-columns: 1fr; }
    .question-word { font-size: 36px; }
    .btn-lg { padding: 15px 20px; font-size: 18px; }
}

.highlight { background: var(--warning); padding: 2px 6px; border-radius: 4px; }

.word-number {
    display: inline-block; background: linear-gradient(135deg, var(--rainbow-1), var(--rainbow-2));
    color: white; width: 32px; height: 32px; line-height: 32px; text-align: center;
    border-radius: 50%; font-size: 14px; font-weight: bold; flex-shrink: 0;
}

.quiz-word-number {
    display: inline-block; background: linear-gradient(135deg, var(--rainbow-3), var(--rainbow-4));
    color: white; padding: 8px 16px; border-radius: 20px; font-size: 16px; margin-bottom: 15px;
}

.group-name-input {
    padding: 10px 16px; border: 2px solid var(--primary-light); border-radius: 12px;
    font-size: 16px; font-family: inherit; width: 200px;
}

.group-name-input:focus { outline: none; border-color: var(--primary); }

.group-list-container {
    background: var(--bg-secondary); border-radius: 14px; padding: 16px;
    margin-bottom: 15px; box-shadow: var(--shadow);
}

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

.group-list-header h2 {
    font-size: 18px; margin: 0; color: var(--primary);
    display: flex; align-items: center; gap: 8px;
}

.group-controls {
    display: flex; align-items: center; gap: 8px; flex-wrap: wrap; font-size: 14px; color: var(--text-secondary);
}

.group-controls select {
    padding: 6px 10px; border: 2px solid var(--primary-light); border-radius: 8px;
    font-size: 13px; font-family: inherit; background: var(--bg-primary); cursor: pointer;
}

.group-controls select:focus { outline: none; border-color: var(--primary); }

.group-controls .group-btn {
    padding: 6px 12px; border-radius: 8px; font-size: 12px;
}

.group-grid {
    display: grid; grid-template-columns: repeat(auto-fill, minmax(82px, 1fr));
    gap: 8px;
}

.group-folder {
    background: linear-gradient(135deg, #FAFAFA, #F5F5F5);
    border: 2px solid #E8E8E8; border-radius: 8px;
    padding: 10px 6px; text-align: center; cursor: pointer;
    transition: all 0.3s ease; position: relative;
}

.group-folder:hover {
    transform: translateY(-2px); box-shadow: 0 4px 12px rgba(0,0,0,0.1);
    border-color: var(--primary-light); background: linear-gradient(135deg, #F0F8FF, #E6F3FF);
}

.group-folder.active {
    background: linear-gradient(135deg, #E6F7FF, #BAE7FF);
    border-color: var(--primary); box-shadow: 0 3px 10px rgba(74, 144, 226, 0.2);
}

.group-folder .folder-icon { font-size: 22px; margin-bottom: 4px; }

.group-folder .folder-name {
    font-size: 12px; font-weight: 600; color: var(--text-primary);
    margin-bottom: 2px; word-break: break-word; line-height: 1.2;
}

.group-folder .folder-count {
    font-size: 10px; color: var(--text-secondary);
}

.group-folder .folder-actions {
    position: absolute; top: 4px; right: 4px;
    display: flex; gap: 3px; opacity: 0; transition: opacity 0.3s;
}

.group-folder:hover .folder-actions { opacity: 1; }

.folder-action-btn {
    background: white; border: none; width: 20px; height: 20px;
    border-radius: 50%; cursor: pointer; font-size: 10px;
    display: flex; align-items: center; justify-content: center;
    transition: all 0.2s; box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.folder-action-btn:hover { transform: scale(1.15); }
.folder-action-btn.rename { color: var(--info); }
.folder-action-btn.delete { color: var(--error); }

/* 占位文件夹（预留空位） */
.group-folder.placeholder {
    background: repeating-linear-gradient(
        45deg,
        #FAFAFA,
        #FAFAFA 10px,
        #F0F0F0 10px,
        #F0F0F0 20px
    );
    border: 2px dashed #D9D9D9;
    cursor: default;
    opacity: 0.7;
}
.group-folder.placeholder:hover {
    transform: none;
    box-shadow: none;
    border-color: #D9D9D9;
    background: repeating-linear-gradient(
        45deg,
        #FAFAFA,
        #FAFAFA 10px,
        #F0F0F0 10px,
        #F0F0F0 20px
    );
}
.group-folder.placeholder .folder-icon {
    opacity: 0.4;
}
.group-folder.placeholder .folder-name {
    color: #BFBFBF;
}
.group-folder.placeholder .folder-count {
    color: #D9D9D9;
}

/* 分页控件 */
.pagination {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    margin-top: 20px;
    flex-wrap: wrap;
}
.page-btn {
    background: var(--bg-secondary);
    border: 2px solid var(--primary-light);
    color: var(--primary);
    padding: 8px 14px;
    border-radius: 10px;
    font-size: 14px;
    cursor: pointer;
    transition: all 0.3s;
    font-family: inherit;
    min-width: 40px;
}
.page-btn:hover:not(:disabled) {
    background: var(--primary);
    color: white;
    transform: translateY(-2px);
}
.page-btn.active {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
    font-weight: bold;
}
.page-btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}
.page-info {
    color: var(--text-secondary);
    font-size: 14px;
    padding: 0 10px;
}

/* 必背课文模块样式 */
.mode-card.texts { border-top: 5px solid var(--rainbow-3); }

.texts-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 15px;
}

.text-card {
    background: var(--bg-primary);
    border: 2px solid var(--border, #e8e8e8);
    border-radius: 14px;
    padding: 20px;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
}

.text-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow);
    border-color: var(--primary-light);
}

.text-card .text-card-title {
    font-size: 18px;
    font-weight: bold;
    color: var(--primary);
    margin-bottom: 8px;
}

.text-card .text-card-preview {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.5;
    max-height: 60px;
    overflow: hidden;
    text-overflow: ellipsis;
}

.text-card-builtin {
    position: absolute;
    bottom: 8px;
    right: 10px;
    font-size: 16px;
    background: none;
    padding: 0;
    border: none;
}

.text-card .text-card-actions {
    position: absolute;
    top: 10px;
    right: 10px;
    display: flex;
    gap: 5px;
    opacity: 0;
    transition: opacity 0.3s;
}

.text-card:hover .text-card-actions { opacity: 1; }

.text-card-action-btn {
    background: white;
    border: none;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    cursor: pointer;
    font-size: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 2px 6px rgba(0,0,0,0.1);
    transition: all 0.2s;
}

.text-card-action-btn:hover { transform: scale(1.1); }
.text-card-action-btn.delete { color: var(--error); }

/* 课文浏览样式 */
.text-reader-content {
    background: var(--bg-primary);
    border-radius: 14px;
    padding: 25px;
    line-height: 2;
    font-size: 18px;
}

.text-reader-content .text-en {
    margin-bottom: 20px;
    color: var(--text-primary);
}

.text-reader-content .text-cn {
    color: var(--text-secondary);
    border-top: 2px dashed var(--border, #e8e8e8);
    padding-top: 15px;
    margin-top: 15px;
}

.text-reader-content .text-cn.hidden { display: none; }

.text-reader-content .paragraph {
    margin-bottom: 12px;
    line-height: 1.8;
    text-indent: 4em;
}

.text-reader-content .paragraph:last-child {
    margin-bottom: 0;
}

/* 跟读模式样式 */
.follow-content {
    background: var(--bg-primary);
    border-radius: 14px;
    padding: 25px;
}

.follow-sentence {
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 1px dashed var(--border, #e8e8e8);
}

.follow-sentence:last-child {
    margin-bottom: 0;
    padding-bottom: 0;
    border-bottom: none;
}

.follow-paragraph-divider {
    height: 20px;
    border-top: 2px solid var(--border, #e8e8e8);
    margin: 15px 0;
}

.follow-paragraph-cn {
    background: #f8f9fa;
    padding: 12px 16px;
    border-radius: 8px;
    margin-bottom: 15px;
    color: #333;
    font-size: 16px;
    line-height: 1.8;
    font-weight: 500;
}

.follow-paragraph-cn.hidden {
    display: none;
}

.follow-en {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    font-size: 18px;
    line-height: 1.8;
}

.follow-number {
    color: var(--primary);
    font-weight: bold;
    min-width: 24px;
}

.follow-text {
    flex: 1;
}

.follow-speak-btn {
    display: inline-flex;
    align-items: center;
    gap: 3px;
    cursor: pointer;
    padding: 3px 8px 3px 3px;
    border-radius: 20px;
    border: 2px solid transparent;
    transition: all 0.2s;
    flex-shrink: 0;
}

.follow-speak-btn:hover {
    border-color: var(--primary-light);
    background: #E6F3FF;
    transform: scale(1.05);
}

.follow-speak-btn:active {
    transform: scale(0.95);
}

.follow-speak-btn .icon {
    font-size: 18px;
}

.follow-speak-btn .tag {
    font-size: 11px;
    font-weight: bold;
    padding: 1px 6px;
    border-radius: 10px;
    color: white;
    line-height: 1.4;
}

.follow-speak-btn .tag.us { background: linear-gradient(135deg, #FF6B6B, #ee5a5a); }
.follow-speak-btn .tag.uk { background: linear-gradient(135deg, #4D96FF, #3a7fe0); }

.follow-cn {
    margin-top: 8px;
    padding-left: 34px;
    color: var(--text-secondary);
    font-size: 16px;
    line-height: 1.6;
}

.follow-cn.hidden {
    display: none;
}

/* 课文默写练习样式 */
.text-practice-content {
    background: var(--bg-primary);
    border-radius: 14px;
    padding: 25px;
    line-height: 2.2;
    font-size: 18px;
}

.text-practice-content .practice-paragraph {
    margin-bottom: 16px;
    text-indent: 4em;
}

.text-practice-content .practice-paragraph:last-child {
    margin-bottom: 0;
}

.text-practice-content .practice-line {
    display: block;
    margin-bottom: 10px;
}

.text-practice-content .blank-input {
    display: inline-block;
    width: 100px;
    padding: 4px 8px;
    border: 2px solid var(--primary-light);
    border-radius: 8px;
    font-size: 16px;
    font-family: inherit;
    text-align: center;
    background: white;
    transition: all 0.3s;
}

.text-practice-content .blank-input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(74, 144, 226, 0.2);
}

.text-practice-content .blank-input.correct {
    border-color: var(--success);
    background: #f6ffed;
}

.text-practice-content .blank-input.wrong {
    border-color: var(--error);
    background: #fff2f0;
}

.text-practice-content .hint-text {
    color: var(--text-light);
    font-size: 14px;
    font-style: italic;
}

.practice-score {
    text-align: center;
    font-size: 24px;
    font-weight: bold;
    padding: 15px;
    border-radius: 12px;
    background: var(--bg-primary);
}

.practice-score.high { color: var(--success); }
.practice-score.medium { color: var(--warning); }
.practice-score.low { color: var(--error); }

/* 默写打印预览样式 */
.print-preview-content {
    background: var(--bg-primary);
    border-radius: 14px;
    padding: 20px;
}

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

.text-print-item {
    display: grid;
    grid-template-columns: 30px 1fr 1fr;
    gap: 15px;
    align-items: center;
    padding: 12px 15px;
    background: white;
    border-radius: 10px;
    border-left: 4px solid var(--primary);
    min-height: 50px;
}

.text-print-item .print-number {
    width: 28px;
    height: 28px;
    line-height: 28px;
    text-align: center;
    background: linear-gradient(135deg, var(--rainbow-4), var(--rainbow-5));
    color: white;
    border-radius: 50%;
    font-size: 14px;
    font-weight: bold;
    justify-self: center;
}

.text-print-item .print-prompt {
    font-size: 15px;
    color: var(--text-primary);
    line-height: 1.6;
    word-break: break-word;
}

.text-print-item .print-answer {
    font-size: 15px;
    color: var(--success);
    font-weight: bold;
    line-height: 1.6;
    padding: 8px 12px;
    background: #f6ffed;
    border-radius: 6px;
    word-break: break-word;
}

.text-print-item .print-answer.hidden {
    display: none;
}

.text-print-item .print-blank {
    height: 36px;
    border-bottom: 2px dashed #ccc;
    min-width: 100%;
}

.text-print-item .print-blank.hidden {
    display: none;
}

/* 段落分组样式（汉译英模式） */
.text-print-paragraph {
    display: flex;
    flex-direction: column;
    gap: 12px;
    padding: 18px;
    background: white;
    border-radius: 10px;
    border-left: 4px solid var(--primary);
    margin-bottom: 15px;
}

.text-print-paragraph .paragraph-header {
    display: flex;
    align-items: flex-start;
    gap: 12px;
}

.text-print-paragraph .print-number {
    width: 28px;
    height: 28px;
    line-height: 28px;
    text-align: center;
    background: linear-gradient(135deg, var(--rainbow-4), var(--rainbow-5));
    color: white;
    border-radius: 50%;
    font-size: 14px;
    font-weight: bold;
    flex-shrink: 0;
}

.text-print-paragraph .paragraph-prompt {
    font-size: 15px;
    color: var(--text-primary);
    line-height: 1.8;
    word-break: break-word;
    flex: 1;
}

.text-print-paragraph .paragraph-answer {
    font-size: 14px;
    color: var(--success);
    font-weight: bold;
    line-height: 1.8;
    padding: 10px 14px;
    background: #f6ffed;
    border-radius: 6px;
    word-break: break-word;
    margin-left: 40px;
}

.text-print-paragraph .paragraph-answer.hidden {
    display: none;
}

.text-print-paragraph .paragraph-blanks {
    display: flex;
    flex-direction: column;
    gap: 20px;
    margin-left: 40px;
    margin-top: 5px;
}

.text-print-paragraph .paragraph-blanks.hidden {
    display: none;
}

.text-print-paragraph .blank-line {
    height: 36px;
    border-bottom: 2px dashed #ccc;
    width: 100%;
}

/* ===== 用户信息区 ===== */
.user-zone {
    display: flex; align-items: center; gap: 12px;
}

.user-avatar {
    width: 48px; height: 48px; border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-light), var(--primary));
    display: flex; align-items: center; justify-content: center;
    font-size: 28px; cursor: pointer; transition: all 0.3s;
    border: 3px solid white; box-shadow: 0 2px 8px rgba(0,0,0,0.15);
    flex-shrink: 0;
}
.user-avatar:hover { transform: scale(1.08); box-shadow: 0 4px 12px rgba(0,0,0,0.2); }

.user-info { display: flex; flex-direction: column; gap: 2px; }
.user-name { font-size: 16px; font-weight: bold; color: var(--text-primary); }
.user-meta { display: flex; gap: 10px; font-size: 12px; color: var(--text-secondary); }
.user-age { background: var(--bg-accent); padding: 1px 8px; border-radius: 10px; }
.user-study-time { white-space: nowrap; }

/* ===== 资料编辑弹窗 ===== */
.profile-modal {
    display: none; position: fixed; top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(0,0,0,0.5); z-index: 2000;
    justify-content: center; align-items: center;
}
.profile-modal.active { display: flex; }

.profile-modal-content {
    background: white; border-radius: 20px; padding: 30px;
    width: 90%; max-width: 380px; text-align: center;
    animation: scaleIn 0.3s ease;
}
.profile-modal-content h3 { font-size: 20px; margin-bottom: 20px; color: var(--primary); }

.avatar-picker {
    display: flex; flex-wrap: wrap; gap: 10px; justify-content: center;
    margin-bottom: 20px;
}
.avatar-option {
    width: 44px; height: 44px; border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    font-size: 24px; cursor: pointer; transition: all 0.2s;
    border: 3px solid transparent; background: var(--bg-primary);
}
.avatar-option:hover { transform: scale(1.1); }
.avatar-option.selected { border-color: var(--primary); background: #E6F3FF; }

.profile-field { margin-bottom: 15px; text-align: left; }
.profile-field label { display: block; font-size: 14px; font-weight: bold; color: var(--text-secondary); margin-bottom: 6px; }
.profile-field input {
    width: 100%; padding: 10px 14px; border: 2px solid var(--primary-light);
    border-radius: 10px; font-size: 16px; font-family: inherit;
}
.profile-field input:focus { outline: none; border-color: var(--primary); }

.profile-actions { display: flex; gap: 12px; margin-top: 20px; }
.profile-actions .btn { flex: 1; }

@media (max-width: 600px) {
    .user-zone { gap: 8px; }
    .user-avatar { width: 40px; height: 40px; font-size: 22px; }
    .user-info { display: none; } /* 手机端隐藏文字，只留头像+退出 */
}

/* ===== 预习模块 ===== */
.yuxi-card {
    background: var(--bg-primary);
    border: 2px solid var(--border, #e8e8e8);
    border-radius: 14px;
    padding: 20px;
    cursor: pointer;
    transition: all 0.3s ease;
    margin-bottom: 14px;
}
.yuxi-card:hover {
    border-color: var(--primary-light);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(74, 144, 226, 0.15);
}
.yuxi-card-head {
    display: flex; align-items: center; gap: 10px; margin-bottom: 8px;
}
.yuxi-unit-num {
    flex-shrink: 0;
    min-width: 52px; text-align: center;
    padding: 3px 8px; border-radius: 8px;
    background: linear-gradient(135deg, var(--primary-light), var(--primary));
    color: white; font-size: 13px; font-weight: bold;
}
.yuxi-card-title {
    flex: 1; font-size: 18px; font-weight: bold; color: var(--primary);
}
.yuxi-card-preview {
    font-size: 14px; color: var(--text-secondary); line-height: 1.5;
}
.yuxi-read-badge {
    flex-shrink: 0; font-size: 13px; color: var(--success); font-weight: bold;
}
.yuxi-tags { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 10px; }
.yuxi-tag {
    font-size: 12px; color: var(--primary);
    background: #E6F3FF; border-radius: 10px; padding: 2px 10px;
}
.yuxi-focus-box {
    background: #FFFBE6; border-left: 4px solid var(--warning, #FAAD14);
    border-radius: 8px; padding: 10px 14px; font-size: 14px; color: var(--text-primary);
    line-height: 1.6;
}
.yuxi-focus-box b { color: var(--text-primary); }
.yuxi-summary-box {
    background: var(--bg-primary); border-radius: 8px;
    padding: 10px 14px; margin-bottom: 15px;
    font-size: 14px; color: var(--text-secondary); line-height: 1.6;
}
.yuxi-follow-sentence.active .follow-text {
    background: #FFF3BF; border-radius: 4px;
}

/* ===== 预习模块 48 课版 ===== */
/* 列表中的两课入口 */
.yuxi-card-lessons { margin-top: 10px; display: flex; flex-direction: column; gap: 8px; }
.yuxi-lesson-row {
    display: flex; align-items: center; gap: 10px;
    padding: 8px 12px; border-radius: 10px;
    background: white; border: 1.5px solid #e8e8e8;
    cursor: pointer; transition: all 0.2s;
}
.yuxi-lesson-row:hover { border-color: var(--primary-light); background: #F5FAFF; }
.yuxi-lesson-badge {
    flex-shrink: 0; font-size: 12px; font-weight: bold;
    padding: 2px 8px; border-radius: 8px; color: white;
}
.yuxi-badge-main { background: var(--primary); }
.yuxi-badge-ext { background: #8E7CC3; }
.yuxi-lesson-name { flex: 1; font-size: 14px; color: var(--text-primary); }
.yuxi-lesson-done { flex-shrink: 0; }

/* 双课切换标签 */
.yuxi-lesson-tabs { display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; margin-bottom: 18px; }
.yuxi-tab {
    border: 2px solid var(--primary); background: white; color: var(--primary);
    padding: 8px 18px; border-radius: 20px; font-size: 14px; font-family: inherit;
    cursor: pointer; transition: all 0.2s;
}
.yuxi-tab:hover { background: #EAF4FF; }
.yuxi-tab.active { background: var(--primary); color: white; }

/* 居中分区标题 */
.yuxi-section-title {
    text-align: center; color: var(--primary);
    margin: 26px 0 16px; font-size: 19px;
    display: flex; align-items: center; gap: 12px;
}
.yuxi-section-title::before, .yuxi-section-title::after {
    content: ''; flex: 1; height: 1px;
    background: linear-gradient(to right, transparent, #C9DDF5, transparent);
}
.yuxi-title-main { font-size: 22px; margin-top: 6px; }

/* 本课内容说明 */
.yuxi-class-box {
    background: #FFFBE6; border-left: 4px solid var(--warning, #FAAD14);
    border-radius: 8px; padding: 10px 14px;
    font-size: 14px; line-height: 1.7; color: var(--text-primary);
}

/* 课文音频播放器 */
.yuxi-audio-box {
    align-items: center; gap: 12px;
    background: var(--bg-primary); border-radius: 12px;
    padding: 10px 16px; margin-bottom: 18px;
}
.yuxi-audio-label {
    flex-shrink: 0; font-weight: bold; color: var(--primary); font-size: 15px;
}
.yuxi-audio-box audio { flex: 1; min-width: 0; height: 38px; }
@media (max-width: 600px) {
    .yuxi-audio-box { flex-direction: column; align-items: stretch; gap: 6px; }
    .yuxi-audio-label { text-align: center; }
}

/* 中英对照课文 */
.yuxi-bilingual .yx-en {
    font-size: 16px; line-height: 1.9; color: var(--text-primary);
    margin: 0 0 4px;
}
.yuxi-bilingual .yx-zh {
    font-size: 14px; line-height: 1.8; color: var(--text-secondary);
    margin: 0 0 18px; padding-left: 12px;
    border-left: 3px solid #E6F3FF;
}
.yuxi-bilingual .yx-zh-divider {
    text-align: center; color: var(--text-light);
    font-size: 13px; margin: 18px 0; letter-spacing: 2px;
}

/* 生词 / 短语 网格 */
.yuxi-vocab-grid {
    display: grid; grid-template-columns: repeat(2, 1fr); gap: 8px;
}
.yuxi-vocab-item {
    display: flex; align-items: center; justify-content: space-between; gap: 10px;
    background: var(--bg-primary); border-radius: 10px; padding: 8px 14px;
    font-size: 15px;
}
.yx-word-en {
    color: var(--primary); font-weight: bold; cursor: pointer; white-space: nowrap;
}
.yx-word-en:hover { text-decoration: underline; }
.yx-word-en small { font-size: 11px; font-weight: normal; }
.yx-word-zh { color: var(--text-secondary); font-size: 14px; text-align: right; }

/* 知识点 */
.yuxi-points {
    list-style: none; padding: 0; margin: 0;
    display: flex; flex-direction: column; gap: 8px;
}
.yuxi-points li {
    position: relative; padding: 10px 14px 10px 34px;
    background: var(--bg-primary); border-radius: 10px;
    font-size: 14px; line-height: 1.7; color: var(--text-primary);
}
.yuxi-points li::before {
    content: '✓'; position: absolute; left: 12px; top: 9px;
    color: var(--success, #52C41A); font-weight: bold;
}

@media (max-width: 600px) {
    .yuxi-vocab-grid { grid-template-columns: 1fr; }
    .yuxi-tab { padding: 7px 12px; font-size: 13px; }
}