/* ==========================================
   CA1 Study Roadmap - Premium Design System
   ========================================== */

/* --- CSS Variables & Reset --- */
:root {
    --bg-primary: #0a0e1a;
    --bg-secondary: #111827;
    --bg-card: #1a2035;
    --bg-card-hover: #1f2847;
    --bg-glass: rgba(26, 32, 53, 0.8);

    --text-primary: #f0f4ff;
    --text-secondary: #94a3c8;
    --text-muted: #6b7fa3;

    --accent-blue: #3b82f6;
    --accent-purple: #8b5cf6;
    --accent-cyan: #06b6d4;
    --accent-emerald: #10b981;
    --accent-amber: #f59e0b;
    --accent-rose: #f43f5e;
    --accent-orange: #f97316;

    --gradient-primary: linear-gradient(135deg, #3b82f6, #8b5cf6);
    --gradient-essay: linear-gradient(135deg, #f59e0b, #f97316);
    --gradient-math: linear-gradient(135deg, #06b6d4, #3b82f6);
    --gradient-combo: linear-gradient(135deg, #10b981, #06b6d4);

    --shadow-sm: 0 2px 8px rgba(0,0,0,0.3);
    --shadow-md: 0 4px 20px rgba(0,0,0,0.4);
    --shadow-lg: 0 8px 40px rgba(0,0,0,0.5);
    --shadow-glow-blue: 0 0 30px rgba(59,130,246,0.2);
    --shadow-glow-purple: 0 0 30px rgba(139,92,246,0.2);

    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;

    --font-main: 'Inter', -apple-system, sans-serif;
    --font-mono: 'JetBrains Mono', monospace;

    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-main);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.7;
    overflow-x: hidden;
    min-height: 100vh;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* --- Particles Background --- */
.particles {
    position: fixed;
    inset: 0;
    z-index: 0;
    pointer-events: none;
    overflow: hidden;
}

.particle {
    position: absolute;
    width: 4px;
    height: 4px;
    background: rgba(59, 130, 246, 0.3);
    border-radius: 50%;
    animation: float-particle linear infinite;
}

@keyframes float-particle {
    0% {
        transform: translateY(100vh) rotate(0deg);
        opacity: 0;
    }
    10% { opacity: 1; }
    90% { opacity: 1; }
    100% {
        transform: translateY(-10vh) rotate(720deg);
        opacity: 0;
    }
}

/* --- Header --- */
.header {
    position: relative;
    z-index: 1;
    padding: 60px 0 40px;
    text-align: center;
    background: linear-gradient(180deg, rgba(59,130,246,0.08) 0%, transparent 100%);
}

.header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(139,92,246,0.1) 0%, transparent 70%);
    pointer-events: none;
}

.header-badge {
    display: inline-block;
    padding: 6px 20px;
    background: var(--gradient-primary);
    border-radius: 50px;
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 2px;
    text-transform: uppercase;
    margin-bottom: 20px;
    animation: fadeInDown 0.6s ease;
}

.header-title {
    font-size: clamp(2.2rem, 5vw, 3.8rem);
    font-weight: 900;
    margin-bottom: 12px;
    animation: fadeInDown 0.8s ease;
}

.title-accent {
    display: block;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.title-code {
    display: inline-block;
    font-size: clamp(3rem, 7vw, 5rem);
    background: linear-gradient(135deg, #f59e0b, #f43f5e, #8b5cf6);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: gradientShift 3s ease infinite;
}

@keyframes gradientShift {
    0%, 100% { filter: hue-rotate(0deg); }
    50% { filter: hue-rotate(30deg); }
}

.header-desc {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 36px;
    animation: fadeInUp 0.8s ease;
}

.header-stats {
    display: flex;
    justify-content: center;
    gap: 20px;
    flex-wrap: wrap;
    animation: fadeInUp 1s ease;
}

.stat-card {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px 24px;
    background: var(--bg-glass);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255,255,255,0.08);
    border-radius: var(--radius-md);
    transition: var(--transition);
}

.stat-card:hover {
    border-color: rgba(59,130,246,0.3);
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow-blue);
}

.stat-icon {
    font-size: 1.8rem;
}

.stat-info {
    display: flex;
    flex-direction: column;
    text-align: left;
}

.stat-label {
    font-size: 0.72rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 1px;
    font-weight: 600;
}

.stat-value {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-primary);
}

/* --- Navigation Tabs --- */
.nav-tabs {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(10, 14, 26, 0.95);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(255,255,255,0.06);
    padding: 12px 0;
}

.tabs-wrapper {
    display: flex;
    gap: 4px;
    overflow-x: auto;
    scrollbar-width: none;
    -ms-overflow-style: none;
    padding: 4px;
}

.tabs-wrapper::-webkit-scrollbar {
    display: none;
}

.tab-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    background: transparent;
    border: 1px solid transparent;
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-family: var(--font-main);
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    white-space: nowrap;
    transition: var(--transition);
}

.tab-btn:hover {
    color: var(--text-primary);
    background: rgba(255,255,255,0.05);
}

.tab-btn.active {
    color: var(--text-primary);
    background: var(--gradient-primary);
    border-color: transparent;
    box-shadow: 0 2px 12px rgba(59,130,246,0.3);
}

.tab-icon {
    font-size: 1.1rem;
}

/* --- Main Content --- */
.main-content {
    position: relative;
    z-index: 1;
    padding: 40px 0;
    min-height: 60vh;
}

.tab-content {
    display: none;
    animation: fadeIn 0.4s ease;
}

.tab-content.active {
    display: block;
}

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

.section-header {
    text-align: center;
    margin-bottom: 48px;
}

.section-header h2 {
    font-size: 1.8rem;
    font-weight: 800;
    margin-bottom: 8px;
}

.section-header p {
    color: var(--text-secondary);
    font-size: 1rem;
}

/* --- Progress Overview --- */
.progress-overview {
    display: flex;
    align-items: center;
    gap: 48px;
    padding: 36px;
    background: var(--bg-card);
    border: 1px solid rgba(255,255,255,0.06);
    border-radius: var(--radius-xl);
    margin-bottom: 48px;
    flex-wrap: wrap;
    justify-content: center;
}

.progress-ring-container {
    position: relative;
    width: 180px;
    height: 180px;
    flex-shrink: 0;
}

.progress-ring {
    width: 100%;
    height: 100%;
    transform: rotate(-90deg);
}

.progress-ring-bg {
    fill: none;
    stroke: rgba(255,255,255,0.06);
    stroke-width: 8;
}

.progress-ring-fill {
    fill: none;
    stroke: url(#progressGradient);
    stroke-width: 8;
    stroke-linecap: round;
    stroke-dasharray: 534;
    stroke-dashoffset: 534;
    transition: stroke-dashoffset 1s ease;
}

.progress-center {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.progress-percent {
    font-size: 2.2rem;
    font-weight: 900;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.progress-label {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.progress-details {
    flex: 1;
    min-width: 280px;
}

.progress-details h3 {
    font-size: 1.3rem;
    margin-bottom: 4px;
}

.progress-details p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 20px;
}

.pbar {
    margin-bottom: 16px;
}

.pbar-header {
    display: flex;
    justify-content: space-between;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 6px;
}

.pbar-track {
    height: 8px;
    background: rgba(255,255,255,0.06);
    border-radius: 20px;
    overflow: hidden;
}

.pbar-fill {
    height: 100%;
    border-radius: 20px;
    transition: width 0.8s ease;
    width: 0%;
}

.essay-fill {
    background: var(--gradient-essay);
}

.math-fill {
    background: var(--gradient-math);
}

/* --- Timeline --- */
.timeline {
    position: relative;
    padding-left: 60px;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 28px;
    top: 0;
    bottom: 0;
    width: 3px;
    background: linear-gradient(180deg, 
        var(--accent-blue), 
        var(--accent-purple), 
        var(--accent-emerald), 
        var(--accent-amber)
    );
    border-radius: 10px;
}

.timeline-phase {
    position: relative;
    margin-bottom: 32px;
}

.phase-marker {
    position: absolute;
    left: -60px;
    top: 0;
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.phase-number {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    font-weight: 800;
    font-size: 1.2rem;
    z-index: 2;
}

.phase-1 .phase-number {
    background: var(--gradient-math);
    box-shadow: 0 0 20px rgba(59,130,246,0.3);
}

.phase-2 .phase-number {
    background: var(--gradient-primary);
    box-shadow: 0 0 20px rgba(139,92,246,0.3);
}

.phase-3 .phase-number {
    background: var(--gradient-combo);
    box-shadow: 0 0 20px rgba(16,185,129,0.3);
}

.phase-4 .phase-number {
    background: var(--gradient-essay);
    box-shadow: 0 0 20px rgba(245,158,11,0.3);
}

.phase-content {
    padding: 28px;
    background: var(--bg-card);
    border: 1px solid rgba(255,255,255,0.06);
    border-radius: var(--radius-lg);
    transition: var(--transition);
}

.phase-content:hover {
    border-color: rgba(59,130,246,0.2);
    box-shadow: var(--shadow-md);
}

.phase-badge {
    display: inline-block;
    padding: 4px 14px;
    background: rgba(59,130,246,0.15);
    border: 1px solid rgba(59,130,246,0.3);
    border-radius: 50px;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--accent-blue);
    margin-bottom: 12px;
}

.phase-content h3 {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 6px;
}

.phase-content > p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 20px;
}

.phase-tasks {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 16px;
}

.task-group {
    padding: 16px;
    background: rgba(255,255,255,0.03);
    border-radius: var(--radius-md);
    border: 1px solid rgba(255,255,255,0.04);
}

.task-group h4 {
    font-size: 0.95rem;
    margin-bottom: 10px;
    color: var(--text-primary);
}

.task-group ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.task-group ul li {
    font-size: 0.85rem;
    color: var(--text-secondary);
    padding-left: 16px;
    position: relative;
}

.task-group ul li::before {
    content: '▸';
    position: absolute;
    left: 0;
    color: var(--accent-cyan);
}

/* --- Content Grid (Essay & Math tabs) --- */
.content-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: 24px;
}

.topic-card {
    padding: 28px;
    background: var(--bg-card);
    border: 1px solid rgba(255,255,255,0.06);
    border-radius: var(--radius-lg);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.topic-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-primary);
    opacity: 0;
    transition: var(--transition);
}

.topic-card:hover {
    border-color: rgba(59,130,246,0.2);
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

.topic-card:hover::before {
    opacity: 1;
}

.math-card::before {
    background: var(--gradient-math);
}

.topic-icon {
    font-size: 2.2rem;
    margin-bottom: 12px;
}

.topic-card h3 {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 16px;
}

.difficulty-badge {
    display: inline-block;
    padding: 3px 12px;
    border-radius: 50px;
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 16px;
}

.difficulty-badge.easy {
    background: rgba(16,185,129,0.15);
    color: var(--accent-emerald);
    border: 1px solid rgba(16,185,129,0.3);
}

.difficulty-badge.medium {
    background: rgba(245,158,11,0.15);
    color: var(--accent-amber);
    border: 1px solid rgba(245,158,11,0.3);
}

.difficulty-badge.hard {
    background: rgba(244,63,94,0.15);
    color: var(--accent-rose);
    border: 1px solid rgba(244,63,94,0.3);
}

/* --- Checklist --- */
.topic-checklist {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.check-item {
    display: flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
    padding: 8px 12px;
    border-radius: var(--radius-sm);
    transition: var(--transition);
    font-size: 0.88rem;
    color: var(--text-secondary);
}

.check-item:hover {
    background: rgba(255,255,255,0.04);
    color: var(--text-primary);
}

.check-item input[type="checkbox"] {
    display: none;
}

.checkmark {
    width: 20px;
    height: 20px;
    border: 2px solid rgba(255,255,255,0.2);
    border-radius: 5px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    transition: var(--transition);
}

.checkmark::after {
    content: '✓';
    font-size: 0.75rem;
    font-weight: 700;
    color: white;
    opacity: 0;
    transform: scale(0);
    transition: var(--transition);
}

.check-item input:checked + .checkmark {
    background: var(--gradient-primary);
    border-color: transparent;
    box-shadow: 0 0 10px rgba(59,130,246,0.3);
}

.check-item input:checked + .checkmark::after {
    opacity: 1;
    transform: scale(1);
}

.check-item input:checked ~ span:last-child {
    text-decoration: line-through;
    color: var(--text-muted);
}

/* --- Guide Cards --- */
.guide-card {
    padding: 32px;
    background: var(--bg-card);
    border: 1px solid rgba(255,255,255,0.06);
    border-radius: var(--radius-lg);
}

.guide-card.full-width {
    grid-column: 1 / -1;
}

.guide-header h3,
.guide-card h3 {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 24px;
}

/* Structure Flow */
.structure-flow {
    display: flex;
    align-items: stretch;
    gap: 12px;
    flex-wrap: wrap;
    justify-content: center;
}

.flow-step {
    flex: 1;
    min-width: 200px;
    padding: 20px;
    background: rgba(255,255,255,0.03);
    border-radius: var(--radius-md);
    border: 1px solid rgba(255,255,255,0.06);
    position: relative;
}

.flow-num {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-primary);
    border-radius: 50%;
    font-weight: 800;
    font-size: 0.85rem;
    margin-bottom: 12px;
}

.flow-step h4 {
    font-size: 1rem;
    margin-bottom: 6px;
}

.flow-step p {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

.flow-arrow {
    display: flex;
    align-items: center;
    font-size: 1.5rem;
    color: var(--accent-blue);
    font-weight: 700;
}

/* Tips Grid */
.tips-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 16px;
}

.tip {
    display: flex;
    gap: 14px;
    align-items: flex-start;
    padding: 16px;
    background: rgba(255,255,255,0.03);
    border-radius: var(--radius-md);
    border: 1px solid rgba(255,255,255,0.04);
    transition: var(--transition);
}

.tip:hover {
    background: rgba(255,255,255,0.06);
    border-color: rgba(59,130,246,0.2);
}

.tip-num {
    font-family: var(--font-mono);
    font-size: 1.4rem;
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    flex-shrink: 0;
}

.tip p {
    font-size: 0.88rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

/* --- Formula Card --- */
.formula-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
}

.formula-group h4 {
    font-size: 0.9rem;
    color: var(--accent-cyan);
    margin-bottom: 12px;
    font-weight: 600;
}

.formula {
    font-family: var(--font-mono);
    font-size: 0.82rem;
    padding: 8px 12px;
    background: rgba(6,182,212,0.08);
    border-left: 3px solid var(--accent-cyan);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    margin-bottom: 8px;
    color: var(--text-primary);
}

/* --- Schedule Tab --- */
.schedule-container {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.week-card {
    background: var(--bg-card);
    border: 1px solid rgba(255,255,255,0.06);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: var(--transition);
}

.week-card:hover {
    border-color: rgba(59,130,246,0.15);
    box-shadow: var(--shadow-sm);
}

.week-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 24px;
    flex-wrap: wrap;
    gap: 8px;
}

.phase-1-bg { background: linear-gradient(135deg, rgba(59,130,246,0.2), rgba(6,182,212,0.15)); }
.phase-2-bg { background: linear-gradient(135deg, rgba(139,92,246,0.2), rgba(59,130,246,0.15)); }
.phase-3-bg { background: linear-gradient(135deg, rgba(16,185,129,0.2), rgba(6,182,212,0.15)); }
.phase-4-bg { background: linear-gradient(135deg, rgba(245,158,11,0.2), rgba(244,63,94,0.15)); }

.week-num {
    font-weight: 800;
    font-size: 1rem;
}

.week-phase {
    font-size: 0.8rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.week-body {
    padding: 20px 24px;
}

.schedule-table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0 8px;
}

.schedule-table th {
    text-align: left;
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    padding: 8px 12px;
}

.schedule-table td {
    padding: 6px;
    vertical-align: top;
}

.time-cell {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-secondary);
    white-space: nowrap;
    min-width: 100px;
}

.schedule-item {
    padding: 14px 16px;
    border-radius: var(--radius-md);
    font-size: 0.85rem;
    font-weight: 500;
    line-height: 1.5;
    transition: var(--transition);
}

.schedule-item:hover {
    transform: scale(1.02);
}

.schedule-item small {
    display: block;
    margin-top: 4px;
    font-size: 0.75rem;
    opacity: 0.7;
}

.essay-bg {
    background: rgba(245,158,11,0.12);
    border: 1px solid rgba(245,158,11,0.2);
    color: #fbbf24;
}

.math-bg {
    background: rgba(6,182,212,0.12);
    border: 1px solid rgba(6,182,212,0.2);
    color: #22d3ee;
}

.combo-bg {
    background: rgba(16,185,129,0.12);
    border: 1px solid rgba(16,185,129,0.2);
    color: #34d399;
}

/* --- Tips Tab --- */
.tips-container {
    display: flex;
    flex-direction: column;
    gap: 32px;
}

.tip-section {
    background: var(--bg-card);
    border: 1px solid rgba(255,255,255,0.06);
    border-radius: var(--radius-lg);
    padding: 28px;
}

.tip-section-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 20px;
}

.tip-section-icon {
    font-size: 1.8rem;
}

.tip-section-header h3 {
    font-size: 1.2rem;
    font-weight: 700;
}

.tip-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 16px;
}

.tip-detail-card {
    padding: 20px;
    background: rgba(255,255,255,0.03);
    border: 1px solid rgba(255,255,255,0.06);
    border-radius: var(--radius-md);
}

.tip-detail-card h4 {
    font-size: 1rem;
    margin-bottom: 12px;
}

.tip-detail-card ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.tip-detail-card li {
    font-size: 0.88rem;
    color: var(--text-secondary);
    padding-left: 12px;
    position: relative;
    line-height: 1.5;
}

.tip-detail-card li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--accent-cyan);
    font-weight: 700;
}

.tip-detail-card li strong {
    color: var(--text-primary);
}

/* Memory Methods */
.memory-methods {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 16px;
}

.method-card {
    padding: 24px;
    background: rgba(255,255,255,0.03);
    border: 1px solid rgba(255,255,255,0.06);
    border-radius: var(--radius-md);
    text-align: center;
    transition: var(--transition);
}

.method-card:hover {
    border-color: rgba(139,92,246,0.3);
    transform: translateY(-3px);
    box-shadow: var(--shadow-glow-purple);
}

.method-icon {
    font-size: 2.2rem;
    margin-bottom: 12px;
}

.method-card h4 {
    font-size: 1rem;
    margin-bottom: 8px;
    font-weight: 700;
}

.method-card p {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

/* Resource List */
.resource-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.resource-item {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 14px 18px;
    background: rgba(255,255,255,0.03);
    border: 1px solid rgba(255,255,255,0.04);
    border-radius: var(--radius-md);
    font-size: 0.9rem;
    color: var(--text-secondary);
    transition: var(--transition);
}

.resource-item:hover {
    background: rgba(255,255,255,0.06);
    border-color: rgba(59,130,246,0.2);
}

.resource-type {
    display: inline-block;
    padding: 3px 10px;
    border-radius: 50px;
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    flex-shrink: 0;
}

.essay-type {
    background: rgba(245,158,11,0.15);
    color: var(--accent-amber);
}

.math-type {
    background: rgba(6,182,212,0.15);
    color: var(--accent-cyan);
}

.yt-type {
    background: rgba(244,63,94,0.15);
    color: var(--accent-rose);
    border: 1px solid rgba(244,63,94,0.25);
}

.book-type {
    background: rgba(139,92,246,0.15);
    color: var(--accent-purple);
    border: 1px solid rgba(139,92,246,0.25);
}

.web-type {
    background: rgba(59,130,246,0.15);
    color: var(--accent-blue);
    border: 1px solid rgba(59,130,246,0.25);
}

.official-type {
    background: rgba(16,185,129,0.15);
    color: var(--accent-emerald);
    border: 1px solid rgba(16,185,129,0.25);
}

.doc-type {
    background: rgba(245,158,11,0.15);
    color: var(--accent-amber);
    border: 1px solid rgba(245,158,11,0.25);
}

/* Resource Links */
a.resource-link {
    text-decoration: none;
    cursor: pointer;
}

a.resource-link:hover {
    background: rgba(59,130,246,0.08);
    border-color: rgba(59,130,246,0.3);
    transform: translateX(4px);
}

.link-arrow {
    margin-left: auto;
    font-size: 1.2rem;
    color: var(--accent-blue);
    opacity: 0;
    transition: var(--transition);
    flex-shrink: 0;
}

a.resource-link:hover .link-arrow {
    opacity: 1;
}

/* Resource Category Headers */
.resource-category {
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--text-primary);
    margin: 20px 0 12px;
    padding-bottom: 6px;
    border-bottom: 1px solid rgba(255,255,255,0.06);
}

.resource-category:first-of-type {
    margin-top: 4px;
}

/* Resource Highlight Section */
.resource-highlight {
    border: 1px solid rgba(59,130,246,0.15);
    background: linear-gradient(180deg, rgba(59,130,246,0.04) 0%, var(--bg-card) 100%);
}

/* Important Note Callout */
.important-note {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    margin-top: 24px;
    padding: 16px 20px;
    background: rgba(245,158,11,0.08);
    border: 1px solid rgba(245,158,11,0.2);
    border-left: 4px solid var(--accent-amber);
    border-radius: var(--radius-md);
}

.note-icon {
    font-size: 1.4rem;
    flex-shrink: 0;
    line-height: 1.5;
}

.important-note p {
    font-size: 0.88rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

.important-note strong {
    color: var(--accent-amber);
}

/* Final Tips */
.final-tips {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 12px;
}

.final-tip {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 16px 20px;
    background: rgba(255,255,255,0.03);
    border: 1px solid rgba(255,255,255,0.06);
    border-radius: var(--radius-md);
    transition: var(--transition);
}

.final-tip:hover {
    background: rgba(16,185,129,0.08);
    border-color: rgba(16,185,129,0.2);
}

.final-tip-icon {
    font-size: 1.6rem;
}

.final-tip p {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* --- Footer --- */
.footer {
    position: relative;
    z-index: 1;
    text-align: center;
    padding: 40px 0;
    border-top: 1px solid rgba(255,255,255,0.06);
    color: var(--text-muted);
    font-size: 0.85rem;
}

.footer-note {
    margin-top: 8px;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* --- Animations --- */
@keyframes fadeInDown {
    from { opacity: 0; transform: translateY(-20px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

/* --- Responsive --- */
@media (max-width: 768px) {
    .header {
        padding: 40px 0 24px;
    }

    .header-stats {
        flex-direction: column;
        align-items: center;
    }

    .stat-card {
        width: 100%;
        max-width: 340px;
    }

    .tab-btn {
        padding: 8px 14px;
        font-size: 0.82rem;
    }

    .progress-overview {
        flex-direction: column;
        padding: 24px;
    }

    .timeline {
        padding-left: 50px;
    }

    .timeline::before {
        left: 18px;
    }

    .phase-marker {
        left: -50px;
    }

    .content-grid {
        grid-template-columns: 1fr;
    }

    .flow-arrow {
        display: none;
    }

    .structure-flow {
        flex-direction: column;
    }

    .phase-tasks {
        grid-template-columns: 1fr;
    }

    .schedule-table {
        font-size: 0.8rem;
    }

    .tip-cards {
        grid-template-columns: 1fr;
    }

    .memory-methods {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }

    .memory-methods {
        grid-template-columns: 1fr;
    }

    .final-tips {
        grid-template-columns: 1fr;
    }

    .schedule-table th:first-child,
    .schedule-table td:first-child {
        display: none;
    }
}

/* ==========================================
   Download Button & Header CTA
   ========================================== */
.header-cta {
    margin-top: 28px;
    animation: fadeInUp 1.2s ease;
}

.download-btn {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    padding: 14px 28px;
    background: linear-gradient(135deg, #f59e0b, #f97316);
    border-radius: var(--radius-md);
    color: #fff;
    font-family: var(--font-main);
    font-size: 0.95rem;
    font-weight: 700;
    text-decoration: none;
    transition: var(--transition);
    box-shadow: 0 4px 20px rgba(245, 158, 11, 0.3);
}

.download-btn:hover {
    transform: translateY(-2px) scale(1.02);
    box-shadow: 0 6px 30px rgba(245, 158, 11, 0.45);
}

.download-icon {
    font-size: 1.3rem;
}

.download-arrow {
    font-size: 1.2rem;
    font-weight: 900;
    animation: bounceDown 1.5s ease infinite;
}

@keyframes bounceDown {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(4px); }
}

/* ==========================================
   Exam Tab Styles
   ========================================== */
.exam-download-hero {
    margin-bottom: 32px;
    padding: 32px;
    background: linear-gradient(135deg, rgba(245,158,11,0.1), rgba(249,115,22,0.08));
    border: 2px solid rgba(245,158,11,0.25);
    border-radius: var(--radius-xl);
    animation: fadeInUp 0.6s ease;
}

.exam-hero-content {
    display: flex;
    align-items: center;
    gap: 20px;
    flex-wrap: wrap;
}

.exam-hero-icon {
    font-size: 3rem;
    flex-shrink: 0;
}

.exam-hero-text {
    flex: 1;
    min-width: 200px;
}

.exam-hero-text h3 {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 4px;
}

.exam-hero-text p {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.download-btn-large {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 16px 32px;
    background: linear-gradient(135deg, #f59e0b, #ef4444);
    border-radius: var(--radius-md);
    color: #fff;
    font-family: var(--font-main);
    font-size: 1rem;
    font-weight: 800;
    text-decoration: none;
    transition: var(--transition);
    box-shadow: 0 4px 20px rgba(245, 158, 11, 0.3);
    white-space: nowrap;
    flex-shrink: 0;
}

.download-btn-large:hover {
    transform: translateY(-3px) scale(1.03);
    box-shadow: 0 8px 35px rgba(245, 158, 11, 0.5);
}

/* Exam Structure */
.exam-structure {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 20px;
}

.exam-part {
    padding: 24px;
    border-radius: var(--radius-md);
    border: 1px solid rgba(255,255,255,0.06);
}

.part-essay {
    background: rgba(245,158,11,0.06);
    border-color: rgba(245,158,11,0.2);
}

.part-math {
    background: rgba(6,182,212,0.06);
    border-color: rgba(6,182,212,0.2);
}

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

.part-badge {
    padding: 4px 14px;
    border-radius: 50px;
    font-size: 0.7rem;
    font-weight: 800;
    letter-spacing: 1px;
}

.essay-badge {
    background: rgba(245,158,11,0.2);
    color: var(--accent-amber);
}

.math-badge {
    background: rgba(6,182,212,0.2);
    color: var(--accent-cyan);
}

.part-score {
    font-size: 1.2rem;
    font-weight: 900;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.exam-part h4 {
    font-size: 1.1rem;
    margin-bottom: 6px;
}

.part-desc {
    font-size: 0.88rem;
    color: var(--text-secondary);
    margin-bottom: 14px;
}

.exam-part ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.exam-part li {
    font-size: 0.85rem;
    color: var(--text-secondary);
    padding-left: 16px;
    position: relative;
    line-height: 1.5;
}

.exam-part li::before {
    content: '▸';
    position: absolute;
    left: 0;
    color: var(--accent-cyan);
}

.part-essay li::before {
    color: var(--accent-amber);
}

.exam-part li strong {
    color: var(--text-primary);
    font-family: var(--font-mono);
    font-size: 0.82rem;
}

/* Score Bars */
.score-bars {
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.score-bar-item {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.score-bar-header {
    display: flex;
    justify-content: space-between;
    font-size: 0.85rem;
    font-weight: 600;
}

.score-bar-track {
    height: 10px;
    background: rgba(255,255,255,0.06);
    border-radius: 20px;
    overflow: hidden;
}

.score-bar-fill {
    height: 100%;
    border-radius: 20px;
    transition: width 1s ease;
}

/* Question Types */
.question-types {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.q-type {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 14px;
    background: rgba(255,255,255,0.03);
    border: 1px solid rgba(255,255,255,0.06);
    border-radius: var(--radius-md);
}

.q-type-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 60px;
    padding: 6px 12px;
    background: var(--gradient-primary);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 800;
    flex-shrink: 0;
}

.q-type strong {
    display: block;
    font-size: 0.9rem;
    margin-bottom: 2px;
}

.q-type p {
    font-size: 0.82rem;
    color: var(--text-muted);
}

/* ==========================================
   Lesson Items (Clickable Topics)
   ========================================== */
.lesson-item {
    display: flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
    padding: 10px 12px;
    border-radius: var(--radius-sm);
    transition: var(--transition);
    font-size: 0.88rem;
    color: var(--text-secondary);
}

.lesson-item:hover {
    background: rgba(6,182,212,0.1);
    color: var(--text-primary);
    transform: translateX(4px);
}

.lesson-item:hover .lesson-arrow {
    opacity: 1;
    transform: scale(1.2);
}

.lesson-link { flex: 1; cursor: pointer; }

.lesson-arrow {
    font-size: 1rem;
    opacity: 0.3;
    transition: var(--transition);
    flex-shrink: 0;
}

.lesson-item input[type="checkbox"] { display: none; }

.lesson-item .checkmark {
    width: 20px; height: 20px;
    border: 2px solid rgba(255,255,255,0.2);
    border-radius: 5px;
    display: flex; align-items: center; justify-content: center;
    flex-shrink: 0;
    transition: var(--transition);
}

.lesson-item .checkmark::after {
    content: '✓'; font-size: 0.75rem; font-weight: 700;
    color: white; opacity: 0; transform: scale(0);
    transition: var(--transition);
}

.lesson-item input:checked + .checkmark {
    background: var(--gradient-primary);
    border-color: transparent;
    box-shadow: 0 0 10px rgba(59,130,246,0.3);
}

.lesson-item input:checked + .checkmark::after {
    opacity: 1; transform: scale(1);
}

/* ==========================================
   Lesson Modal
   ========================================== */
.lesson-modal-overlay {
    position: fixed; inset: 0; z-index: 10000;
    background: rgba(0,0,0,0.85);
    backdrop-filter: blur(8px);
    display: none;
    align-items: flex-start; justify-content: center;
    padding: 24px; overflow-y: auto;
}
.lesson-modal-overlay.active { display: flex; }

.lesson-modal {
    background: var(--bg-secondary);
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: var(--radius-xl);
    width: 100%; max-width: 900px;
    margin: 20px auto;
    box-shadow: 0 20px 80px rgba(0,0,0,0.6);
    animation: modalSlideIn 0.3s ease;
    overflow: hidden;
}

@keyframes modalSlideIn {
    from { opacity: 0; transform: translateY(30px) scale(0.97); }
    to { opacity: 1; transform: translateY(0) scale(1); }
}

.lesson-modal-header {
    display: flex; justify-content: space-between; align-items: flex-start;
    padding: 28px 32px 20px;
    background: linear-gradient(135deg, rgba(6,182,212,0.1), rgba(59,130,246,0.08));
    border-bottom: 1px solid rgba(255,255,255,0.06);
}

.lesson-modal-title h2 { font-size: 1.4rem; font-weight: 800; margin-top: 6px; }

.lesson-modal-category {
    display: inline-block; padding: 3px 12px;
    background: rgba(6,182,212,0.15); border: 1px solid rgba(6,182,212,0.3);
    border-radius: 50px; font-size: 0.72rem; font-weight: 700;
    color: var(--accent-cyan); text-transform: uppercase; letter-spacing: 0.5px;
}

.lesson-modal-close {
    background: rgba(255,255,255,0.06); border: 1px solid rgba(255,255,255,0.1);
    border-radius: 50%; width: 40px; height: 40px;
    display: flex; align-items: center; justify-content: center;
    font-size: 1.5rem; color: var(--text-secondary);
    cursor: pointer; transition: var(--transition); flex-shrink: 0;
}
.lesson-modal-close:hover {
    background: rgba(244,63,94,0.2); color: var(--accent-rose);
}

.lesson-modal-tabs {
    display: flex; gap: 2px; padding: 8px 32px;
    background: rgba(0,0,0,0.2); overflow-x: auto; scrollbar-width: none;
}
.lesson-modal-tabs::-webkit-scrollbar { display: none; }

.lm-tab {
    padding: 10px 16px; background: transparent; border: none;
    border-radius: var(--radius-sm); color: var(--text-muted);
    font-family: var(--font-main); font-size: 0.82rem;
    font-weight: 600; cursor: pointer; white-space: nowrap;
    transition: var(--transition);
}
.lm-tab:hover { color: var(--text-primary); background: rgba(255,255,255,0.05); }
.lm-tab.active { color: var(--text-primary); background: var(--gradient-math); }

.lesson-modal-body {
    padding: 28px 32px; max-height: 65vh; overflow-y: auto;
}
.lesson-modal-body::-webkit-scrollbar { width: 6px; }
.lesson-modal-body::-webkit-scrollbar-track { background: rgba(255,255,255,0.03); }
.lesson-modal-body::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.1); border-radius: 10px; }

.lm-content { display: none; animation: fadeIn 0.3s ease; }
.lm-content.active { display: block; }

.lm-content h4 {
    font-size: 1.05rem; font-weight: 700; color: var(--accent-cyan);
    margin: 20px 0 10px; padding-bottom: 6px;
    border-bottom: 1px solid rgba(6,182,212,0.15);
}
.lm-content h4:first-child { margin-top: 0; }

.lm-content p { font-size: 0.9rem; color: var(--text-secondary); line-height: 1.7; margin-bottom: 12px; }
.lm-content ul, .lm-content ol { margin: 8px 0 16px 20px; color: var(--text-secondary); font-size: 0.88rem; line-height: 1.7; }
.lm-content li { margin-bottom: 6px; }
.lm-content strong { color: var(--text-primary); }
.lm-content code { font-family: var(--font-mono); background: rgba(6,182,212,0.1); padding: 2px 6px; border-radius: 4px; font-size: 0.85rem; color: var(--accent-cyan); }

.lm-content .formula {
    font-family: var(--font-mono); font-size: 0.9rem; padding: 12px 16px;
    background: rgba(6,182,212,0.06); border-left: 3px solid var(--accent-cyan);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    margin: 10px 0; color: var(--text-primary); line-height: 1.6;
}

.lm-content .example {
    padding: 16px; background: rgba(16,185,129,0.06);
    border: 1px solid rgba(16,185,129,0.15);
    border-radius: var(--radius-md); margin: 12px 0;
}

.lm-content .example-hard {
    padding: 16px; background: rgba(244,63,94,0.06);
    border: 1px solid rgba(244,63,94,0.15);
    border-radius: var(--radius-md); margin: 12px 0;
}

.lm-content .exam-question {
    padding: 16px; background: rgba(245,158,11,0.06);
    border: 1px solid rgba(245,158,11,0.2);
    border-left: 4px solid var(--accent-amber);
    border-radius: var(--radius-md); margin: 12px 0;
}

.lm-content .warning {
    padding: 12px 16px; background: rgba(244,63,94,0.08);
    border: 1px solid rgba(244,63,94,0.2); border-left: 3px solid var(--accent-rose);
    border-radius: var(--radius-md); margin: 12px 0; font-size: 0.88rem;
}

.lm-content .tip-box {
    padding: 12px 16px; background: rgba(16,185,129,0.08);
    border: 1px solid rgba(16,185,129,0.2); border-left: 3px solid var(--accent-emerald);
    border-radius: var(--radius-md); margin: 12px 0; font-size: 0.88rem;
}

@media (max-width: 768px) {
    .lesson-modal { margin: 10px; border-radius: var(--radius-lg); }
    .lesson-modal-header { padding: 20px; }
    .lesson-modal-body { padding: 20px; max-height: 70vh; }
    .lesson-modal-tabs { padding: 6px 16px; }
    .lm-tab { padding: 8px 12px; font-size: 0.75rem; }
}