/* ============================================================
   日语学习系统 v2 - 样式表
   移动端优先响应式设计
   ============================================================ */

/* --- Reset & Base --- */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    --primary: #4F46E5;
    --primary-hover: #4338CA;
    --primary-light: #EEF2FF;
    --success: #059669;
    --success-light: #ECFDF5;
    --danger: #DC2626;
    --danger-light: #FEF2F2;
    --warning: #D97706;
    --warning-light: #FFFBEB;
    --bg: #F8FAFC;
    --card-bg: #FFFFFF;
    --text: #1E293B;
    --text-secondary: #64748B;
    --border: #E2E8F0;
    --radius: 12px;
    --radius-sm: 8px;
    --shadow: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
    --shadow-lg: 0 4px 24px rgba(0,0,0,0.08);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    min-height: 100vh;
}

/* --- Navbar --- */
.navbar {
    background: var(--card-bg);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow);
}

.nav-inner {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 16px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 52px;
}

.nav-brand {
    font-size: 16px;
    font-weight: 700;
    color: var(--primary);
    text-decoration: none;
}

.nav-links {
    display: flex;
    gap: 2px;
    align-items: center;
    flex-wrap: nowrap;
    overflow-x: auto;
}

.nav-link {
    padding: 6px 10px;
    border-radius: var(--radius-sm);
    font-size: 13px;
    color: var(--text-secondary);
    text-decoration: none;
    transition: all 0.15s;
    white-space: nowrap;
}

.nav-link:hover, .nav-link.active {
    background: var(--primary-light);
    color: var(--primary);
}

.nav-user {
    padding: 4px 8px;
    background: var(--primary-light);
    border-radius: var(--radius-sm);
    font-size: 12px;
    font-weight: 600;
    color: var(--primary);
    white-space: nowrap;
}

/* --- Container --- */
.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px 16px 40px;
}

/* --- Buttons --- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 24px;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.15s;
    text-decoration: none;
    width: 100%;
}

.btn:active { transform: scale(0.97); }

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

.btn-secondary {
    background: var(--bg);
    color: var(--text);
    border: 1px solid var(--border);
    margin-top: 12px;
}

.btn-lg { padding: 14px 32px; font-size: 17px; }

.btn-sm {
    padding: 6px 14px;
    border: none;
    border-radius: 6px;
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.15s;
}

.btn-learn { background: var(--success-light); color: var(--success); }
.btn-learn:hover { background: #D1FAE5; }
.btn-hard { background: var(--warning-light); color: var(--warning); }
.btn-hard:hover { background: #FEF3C7; }

.skip-btn {
    padding: 8px 16px;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 14px;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.15s;
}

.skip-btn:hover {
    border-color: var(--primary);
    color: var(--primary);
    background: var(--primary-light);
}

/* --- Hero / Dashboard --- */
.hero {
    text-align: center;
    padding: 32px 0;
}

.hero h1 { font-size: 28px; margin-bottom: 8px; }

.hero-desc {
    color: var(--text-secondary);
    font-size: 15px;
    line-height: 1.8;
    margin-bottom: 32px;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 12px;
    margin-bottom: 32px;
}

.feature-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px 16px;
    text-align: center;
    box-shadow: var(--shadow);
}

.feature-card .feature-icon { font-size: 32px; margin-bottom: 8px; }
.feature-card h3 { font-size: 15px; margin-bottom: 4px; }
.feature-card p { font-size: 13px; color: var(--text-secondary); line-height: 1.5; }

.cta-section { text-align: center; padding: 20px 0; }
.cta-section .btn { display: inline-block; width: auto; }

/* --- Dashboard v2 --- */
.dash-header { text-align: center; margin-bottom: 20px; }

.dash-level {
    display: inline-block;
    background: var(--primary);
    color: white;
    padding: 4px 16px;
    border-radius: 16px;
    font-size: 14px;
    font-weight: 700;
    margin-bottom: 8px;
}

.dash-sub { color: var(--text-secondary); font-size: 14px; margin-top: 4px; }

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 12px;
    margin: 20px 0;
}

.stat-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 16px;
    text-align: center;
    box-shadow: var(--shadow);
}

.stat-card.stat-urgent { border-color: var(--warning); background: var(--warning-light); }

.stat-value { font-size: 24px; font-weight: 700; color: var(--primary); }
.stat-label { font-size: 13px; color: var(--text-secondary); margin-top: 4px; }
.stat-sub { font-size: 11px; color: var(--text-secondary); }

.today-preview {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 16px 20px;
    margin: 16px 0;
}

.today-preview h3 { font-size: 15px; margin-bottom: 10px; }

.preview-vocab, .preview-grammar {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 8px;
}

.preview-word {
    background: var(--primary-light);
    color: var(--primary);
    padding: 4px 12px;
    border-radius: 14px;
    font-size: 14px;
    font-weight: 600;
}

.preview-gram {
    background: #F0FDF4;
    color: var(--success);
    padding: 4px 12px;
    border-radius: 14px;
    font-size: 13px;
}

.preview-more { font-size: 13px; color: var(--text-secondary); align-self: center; }

.action-buttons {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-top: 20px;
}

.action-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
}

.quick-links {
    display: flex;
    gap: 16px;
    justify-content: center;
    margin-top: 20px;
}

.quick-link {
    color: var(--text-secondary);
    font-size: 14px;
    text-decoration: none;
}

.quick-link:hover { color: var(--primary); }

/* --- Daily Page --- */
.daily-container { padding-bottom: 40px; }

.daily-header { text-align: center; margin-bottom: 16px; }

.daily-level-badge {
    display: inline-block;
    background: var(--primary);
    color: white;
    padding: 4px 16px;
    border-radius: 16px;
    font-size: 14px;
    font-weight: 700;
    margin-bottom: 6px;
}

.daily-subtitle { color: var(--text-secondary); font-size: 14px; line-height: 1.7; }

.review-alert { color: var(--warning); font-weight: 600; }
.review-ok { color: var(--success); font-weight: 600; }

.daily-progress { margin: 16px 0; }

.progress-section {
    display: flex;
    align-items: center;
    gap: 10px;
}

.progress-label { font-size: 13px; color: var(--text-secondary); white-space: nowrap; }

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

.progress-fill-lg {
    height: 100%;
    background: var(--primary);
    border-radius: 4px;
    transition: width 0.5s;
}

.progress-text { font-size: 13px; font-weight: 600; color: var(--primary); white-space: nowrap; }

/* Daily Tabs */
.daily-tabs {
    display: flex;
    gap: 0;
    margin: 16px 0;
    background: var(--card-bg);
    border-radius: var(--radius);
    overflow: hidden;
    border: 1px solid var(--border);
    box-shadow: var(--shadow);
}

.daily-tab {
    flex: 1;
    padding: 12px 8px;
    border: none;
    background: none;
    font-size: 14px;
    font-weight: 600;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.15s;
    text-align: center;
}

.daily-tab.active {
    background: var(--primary);
    color: white;
}

.daily-tab:hover:not(.active) {
    background: var(--primary-light);
    color: var(--primary);
}

.tab-count {
    display: inline-block;
    background: rgba(255,255,255,0.3);
    padding: 1px 7px;
    border-radius: 10px;
    font-size: 11px;
    margin-left: 4px;
}

.daily-tab.active .tab-count { background: rgba(255,255,255,0.3); }

/* Learn Sections */
.learn-section {
    margin-bottom: 24px;
}

.section-title {
    font-size: 16px;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--text);
}

/* Vocab Teach Card */
.vocab-teach-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.vocab-teach-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 14px 16px;
    box-shadow: var(--shadow);
    transition: all 0.3s;
}

.vocab-teach-card.learned-ok {
    border-color: var(--success);
    background: var(--success-light);
    opacity: 0.7;
}

.vocab-teach-card.learned-hard {
    border-color: var(--warning);
    background: var(--warning-light);
}

.vocab-teach-card.review-card {
    border-left: 3px solid var(--primary);
}

.vtc-main {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 4px;
}

.vtc-word {
    font-size: 22px;
    font-weight: 700;
    color: var(--text);
}

.tts-btn {
    width: 32px;
    height: 32px;
    border: 1px solid var(--border);
    border-radius: 50%;
    background: var(--bg);
    font-size: 16px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.15s;
}

.tts-btn:hover { background: var(--primary-light); border-color: var(--primary); }

.tts-btn-lg {
    display: block;
    width: 100%;
    padding: 16px;
    background: var(--primary-light);
    border: 2px solid var(--primary);
    border-radius: var(--radius-sm);
    font-size: 24px;
    cursor: pointer;
    margin: 12px 0;
    transition: all 0.15s;
}

.tts-btn-lg:hover { background: #C7D2FE; }

.vtc-reading {
    font-size: 14px;
    color: var(--primary);
    margin-bottom: 2px;
    font-weight: 500;
}

.vtc-meaning {
    font-size: 15px;
    color: var(--text);
    margin-bottom: 4px;
}

.vtc-pos {
    font-size: 12px;
    color: var(--text-secondary);
    background: var(--bg);
    display: inline-block;
    padding: 2px 8px;
    border-radius: 4px;
    margin-bottom: 6px;
}

.vtc-example {
    font-size: 13px;
    color: var(--text-secondary);
    margin-top: 4px;
    line-height: 1.6;
}

.vtc-actions {
    display: flex;
    gap: 8px;
    margin-top: 8px;
}

/* Grammar Teach Card */
.grammar-teach-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.grammar-teach-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 14px 16px;
    box-shadow: var(--shadow);
    transition: all 0.3s;
}

.grammar-teach-card.learned-ok {
    border-color: var(--success);
    background: var(--success-light);
    opacity: 0.7;
}

.grammar-teach-card.learned-hard {
    border-color: var(--warning);
    background: var(--warning-light);
}

.gtc-pattern {
    font-size: 20px;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 6px;
}

.gtc-explanation {
    font-size: 15px;
    color: var(--text);
    margin-bottom: 6px;
    line-height: 1.6;
}

.gtc-formation {
    font-size: 13px;
    color: var(--text-secondary);
    background: var(--bg);
    padding: 6px 10px;
    border-radius: 6px;
    margin-bottom: 6px;
}

.gtc-examples { margin-top: 8px; }
.gtc-examples-title { font-size: 13px; color: var(--text-secondary); font-weight: 600; }
.gtc-example-text { font-size: 14px; color: var(--text); line-height: 1.8; margin-top: 4px; }
.gtc-actions { display: flex; gap: 8px; margin-top: 10px; }

/* Mastery Indicator */
.mastery-indicator {
    font-size: 12px;
    color: var(--text-secondary);
    margin-top: 6px;
}

.mastery-dot { color: var(--border); font-size: 10px; }
.mastery-dot.filled { color: var(--primary); }

/* Empty State */
.empty-state {
    text-align: center;
    padding: 40px 20px;
    color: var(--text-secondary);
    font-size: 15px;
}

/* --- Exercise Area --- */
.exercise-start {
    text-align: center;
    padding: 40px 20px;
}

.exercise-info h3 { font-size: 18px; margin-bottom: 8px; }
.exercise-info p { font-size: 14px; color: var(--text-secondary); margin-bottom: 4px; }

.question-type-badge {
    display: inline-block;
    background: var(--primary-light);
    color: var(--primary);
    padding: 3px 10px;
    border-radius: 10px;
    font-size: 12px;
    font-weight: 600;
    margin-bottom: 10px;
}

/* Progress Bar */
.question-progress { margin-bottom: 16px; }

.progress-bar {
    width: 100%;
    height: 6px;
    background: var(--border);
    border-radius: 3px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: var(--primary);
    border-radius: 3px;
    transition: width 0.3s;
}

#pracProgressText, #exProgressText {
    display: block;
    text-align: right;
    font-size: 12px;
    color: var(--text-secondary);
    margin-top: 4px;
}

/* Question Card */
.question-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px;
    box-shadow: var(--shadow);
}

.question-text {
    font-size: 17px;
    font-weight: 600;
    margin-bottom: 16px;
    line-height: 1.7;
    white-space: pre-line;
}

/* Options */
.options-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.option-btn {
    display: block;
    width: 100%;
    padding: 14px 18px;
    background: var(--bg);
    border: 2px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 16px;
    text-align: left;
    cursor: pointer;
    transition: all 0.15s;
    color: var(--text);
}

.option-btn:hover { border-color: var(--primary); background: var(--primary-light); }
.option-btn:active { transform: scale(0.98); }

/* Ordering */
.ordering-area { margin: 16px 0; }

.ordering-source, .ordering-target {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    min-height: 48px;
    padding: 12px;
    border-radius: var(--radius-sm);
    margin-bottom: 8px;
}

.ordering-source {
    background: var(--bg);
    border: 1px dashed var(--border);
}

.ordering-target {
    background: var(--primary-light);
    border: 2px solid var(--primary);
    min-height: 56px;
}

.order-word {
    padding: 8px 16px;
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 16px;
    cursor: pointer;
    transition: all 0.15s;
    font-weight: 600;
}

.order-word:hover { border-color: var(--primary); background: white; }

.order-word.placed {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
}

/* Fill Input */
.fill-input {
    width: 100%;
    padding: 14px 16px;
    border: 2px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 18px;
    outline: none;
    transition: border-color 0.15s;
    margin-bottom: 12px;
}

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

/* --- Results --- */
.result-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 32px 24px;
    text-align: center;
    box-shadow: var(--shadow-lg);
}

.result-card h2 { margin-bottom: 16px; }

.score-circle {
    width: 100px;
    height: 100px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 16px auto;
    font-size: 28px;
    font-weight: 700;
    border: 4px solid;
}

.score-circle.passed { color: var(--success); border-color: var(--success); background: #ECFDF5; }
.score-circle.failed { color: var(--warning); border-color: var(--warning); background: #FFFBEB; }

/* Error Review */
.error-review { text-align: left; margin-top: 24px; }
.error-review h3 { font-size: 15px; margin-bottom: 12px; color: var(--danger); }

.error-item {
    background: #FEF2F2;
    border: 1px solid #FECACA;
    border-radius: var(--radius-sm);
    padding: 12px 16px;
    margin-bottom: 8px;
    font-size: 14px;
}

.error-q { font-weight: 600; margin-bottom: 6px; }
.wrong-answer { color: var(--danger); font-weight: 600; }
.correct-answer { color: var(--success); font-weight: 600; }
.error-explanation { margin-top: 6px; font-size: 13px; color: var(--text-secondary); }

/* --- Practice Setup --- */
.setup-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px;
    box-shadow: var(--shadow);
}

.setup-card h3 { margin-bottom: 16px; }

.setup-row {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 12px;
    font-size: 14px;
}

.setup-row select {
    padding: 6px 12px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 14px;
    background: var(--card-bg);
}

.type-checks {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 16px;
}

.check-label {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 14px;
    cursor: pointer;
}

.check-label input[type="checkbox"] {
    width: 18px;
    height: 18px;
    accent-color: var(--primary);
}

/* --- Learn Page (full course browse) --- */
.learn-header { text-align: center; margin-bottom: 16px; }

.learn-level-badge {
    display: inline-block;
    background: var(--primary);
    color: white;
    padding: 4px 16px;
    border-radius: 16px;
    font-size: 14px;
    font-weight: 700;
    margin-bottom: 6px;
}

.learn-sub { color: var(--text-secondary); font-size: 14px; }

.unit-nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 16px;
    gap: 8px;
}

.unit-nav-btn {
    padding: 8px 14px;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 13px;
    color: var(--text-secondary);
    text-decoration: none;
    transition: all 0.15s;
}

.unit-nav-btn:hover { border-color: var(--primary); color: var(--primary); }

.unit-nav-current { font-size: 14px; font-weight: 600; color: var(--text); }

.unit-nav-daily {
    background: var(--primary-light);
    color: var(--primary);
    border-color: var(--primary);
}

.tab-switch {
    display: flex;
    gap: 0;
    margin-bottom: 16px;
    border-bottom: 2px solid var(--border);
}

.tab-btn {
    padding: 10px 24px;
    border: none;
    background: none;
    font-size: 15px;
    font-weight: 600;
    color: var(--text-secondary);
    cursor: pointer;
    border-bottom: 2px solid transparent;
    margin-bottom: -2px;
    transition: all 0.15s;
}

.tab-btn.active { color: var(--primary); border-bottom-color: var(--primary); }
.tab-btn:hover { color: var(--primary); }

.tab-content { min-height: 200px; }

/* --- Level Tabs (legacy compat) --- */
.level-tabs {
    display: flex;
    gap: 6px;
    margin-bottom: 20px;
    overflow-x: auto;
}

.level-tab {
    padding: 8px 18px;
    border-radius: 20px;
    font-size: 14px;
    font-weight: 600;
    text-decoration: none;
    background: var(--bg);
    color: var(--text-secondary);
    border: 1px solid var(--border);
    transition: all 0.15s;
}

.level-tab.active, .level-tab:hover {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
}

/* --- Stage Indicator --- */
.stage-indicator {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px 0;
    gap: 0;
}

.stage-dot {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
}

.dot-circle {
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--border);
    transition: all 0.3s;
}

.stage-dot.active .dot-circle { background: var(--primary); box-shadow: 0 0 0 4px var(--primary-light); }
.stage-dot.completed .dot-circle { background: var(--success); }
.stage-dot span { font-size: 11px; color: var(--text-secondary); white-space: nowrap; }
.stage-dot.active span { color: var(--primary); font-weight: 600; }

.stage-line { width: 30px; height: 2px; background: var(--border); margin: 0 4px 20px; }

/* --- Section Card --- */
.section-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px;
    box-shadow: var(--shadow);
}

.section-card h3 { font-size: 16px; margin-bottom: 12px; }

/* --- Score Breakdown --- */
.score-breakdown { text-align: left; margin-top: 24px; }
.score-breakdown h3 { font-size: 15px; margin-bottom: 12px; }

.breakdown-bars { display: flex; flex-direction: column; gap: 10px; }
.breakdown-row { display: flex; align-items: center; gap: 10px; }
.breakdown-label { width: 50px; font-size: 13px; color: var(--text-secondary); text-align: right; flex-shrink: 0; }

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

.breakdown-bar-fill {
    height: 100%;
    background: var(--primary);
    border-radius: 4px;
    transition: width 0.6s ease;
}

.breakdown-score { width: 70px; font-size: 13px; font-weight: 600; color: var(--text); flex-shrink: 0; }

/* --- Trend Bars --- */
.trend-bars {
    display: flex;
    align-items: flex-end;
    gap: 12px;
    height: 120px;
    padding-top: 10px;
}

.trend-bar-col {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-end;
    gap: 4px;
}

.trend-bar {
    width: 100%;
    max-width: 40px;
    background: var(--primary);
    border-radius: 4px 4px 0 0;
    min-height: 4px;
    transition: height 0.5s ease;
}

.trend-date { font-size: 10px; color: var(--text-secondary); }
.trend-count { font-size: 11px; font-weight: 600; color: var(--text); }

.subtitle { color: var(--text-secondary); font-size: 14px; margin-bottom: 20px; }

.pagination {
    display: flex;
    gap: 4px;
    justify-content: center;
    margin-top: 20px;
    flex-wrap: wrap;
}

.page-btn {
    padding: 6px 12px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--card-bg);
    font-size: 13px;
    cursor: pointer;
    color: var(--text);
}

.page-btn.active { background: var(--primary); color: white; border-color: var(--primary); }
.page-btn:hover:not(.active) { border-color: var(--primary); }

/* --- Mobile adjustments --- */
@media (max-width: 480px) {
    .container { padding: 12px 10px 32px; }

    .hero h1 { font-size: 22px; }

    .feature-grid { grid-template-columns: 1fr 1fr; gap: 8px; }
    .feature-card { padding: 14px 10px; }

    .stats-grid { grid-template-columns: 1fr 1fr; gap: 8px; }
    .stat-value { font-size: 20px; }

    .question-card { padding: 16px; }
    .question-text { font-size: 15px; }

    .option-btn { padding: 12px 14px; font-size: 15px; }

    .daily-tabs { flex-direction: column; }
    .daily-tab { border-bottom: 1px solid var(--border); }

    .vtc-word { font-size: 18px; }
    .gtc-pattern { font-size: 18px; }

    .nav-link { padding: 4px 6px; font-size: 12px; }

    .action-buttons { gap: 8px; }

    .order-word { padding: 6px 12px; font-size: 14px; }
}