/* ===== IMPORTS ===== */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&family=JetBrains+Mono:wght@400;500;600&display=swap');

/* ===== CSS VARIABLES ===== */
:root {
    --bg-primary: #0a0a1a;
    --bg-secondary: #111128;
    --bg-card: rgba(20, 20, 50, 0.6);
    --bg-card-hover: rgba(30, 30, 70, 0.8);
    --glass: rgba(255, 255, 255, 0.03);
    --glass-border: rgba(255, 255, 255, 0.08);
    --text-primary: #e8e8f0;
    --text-secondary: #9090b0;
    --text-muted: #606080;
    --accent-1: #6c5ce7;
    --accent-2: #00cec9;
    --accent-3: #fd79a8;
    --accent-4: #fdcb6e;
    --gradient-1: linear-gradient(135deg, #6c5ce7, #00cec9);
    --gradient-2: linear-gradient(135deg, #fd79a8, #fdcb6e);
    --gradient-3: linear-gradient(135deg, #00cec9, #6c5ce7);
    --shadow-glow: 0 0 30px rgba(108, 92, 231, 0.15);
    --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.3);
    --radius: 16px;
    --radius-sm: 8px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
    scrollbar-width: thin;
    scrollbar-color: var(--accent-1) var(--bg-primary);
}

::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-primary); }
::-webkit-scrollbar-thumb { background: var(--accent-1); border-radius: 3px; }

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    min-height: 100vh;
}

/* ===== ANIMATED BACKGROUND ===== */
.bg-circuit {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    pointer-events: none;
    overflow: hidden;
}

.bg-circuit::before {
    content: '';
    position: absolute;
    width: 200%;
    height: 200%;
    top: -50%;
    left: -50%;
    background: 
        radial-gradient(circle at 20% 30%, rgba(108, 92, 231, 0.08) 0%, transparent 50%),
        radial-gradient(circle at 80% 70%, rgba(0, 206, 201, 0.06) 0%, transparent 50%),
        radial-gradient(circle at 50% 50%, rgba(253, 121, 168, 0.04) 0%, transparent 50%);
    animation: bgFloat 20s ease-in-out infinite;
}

@keyframes bgFloat {
    0%, 100% { transform: translate(0, 0) rotate(0deg); }
    25% { transform: translate(2%, -2%) rotate(1deg); }
    50% { transform: translate(-1%, 3%) rotate(-1deg); }
    75% { transform: translate(3%, 1%) rotate(0.5deg); }
}

/* Grid lines */
.grid-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    pointer-events: none;
    background-image: 
        linear-gradient(rgba(108, 92, 231, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(108, 92, 231, 0.03) 1px, transparent 1px);
    background-size: 60px 60px;
}

/* ===== NAVIGATION ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 1rem 2rem;
    transition: var(--transition);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    background: rgba(10, 10, 26, 0.8);
    border-bottom: 1px solid var(--glass-border);
}

.navbar.scrolled {
    padding: 0.6rem 2rem;
    background: rgba(10, 10, 26, 0.95);
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    text-decoration: none;
    font-weight: 800;
    font-size: 1.25rem;
    color: var(--text-primary);
}

.nav-logo .logo-icon {
    width: 36px;
    height: 36px;
    background: var(--gradient-1);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    font-weight: 900;
    color: white;
    box-shadow: 0 0 20px rgba(108, 92, 231, 0.4);
}

.nav-logo span {
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 0.5rem;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-secondary);
    padding: 0.6rem 1.2rem;
    border-radius: var(--radius-sm);
    font-weight: 500;
    font-size: 0.9rem;
    transition: var(--transition);
    position: relative;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--text-primary);
    background: rgba(108, 92, 231, 0.1);
}

.nav-links a.active::after {
    content: '';
    position: absolute;
    bottom: 4px;
    left: 50%;
    transform: translateX(-50%);
    width: 20px;
    height: 2px;
    background: var(--gradient-1);
    border-radius: 1px;
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0.5rem;
}

/* ===== HERO SECTION ===== */
.hero {
    position: relative;
    z-index: 1;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 6rem 2rem 4rem;
    text-align: center;
}

.hero-content {
    max-width: 800px;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1.2rem;
    background: var(--glass);
    border: 1px solid var(--glass-border);
    border-radius: 50px;
    font-size: 0.85rem;
    color: var(--accent-2);
    margin-bottom: 2rem;
    animation: fadeInUp 0.8s ease;
}

.hero-badge .pulse {
    width: 8px;
    height: 8px;
    background: var(--accent-2);
    border-radius: 50%;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.5; transform: scale(1.5); }
}

.hero h1 {
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    font-weight: 900;
    line-height: 1.1;
    margin-bottom: 1.5rem;
    animation: fadeInUp 0.8s ease 0.1s both;
}

.hero h1 .gradient-text {
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero p {
    font-size: 1.2rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto 2.5rem;
    animation: fadeInUp 0.8s ease 0.2s both;
}

.hero-buttons {
    display: flex;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
    animation: fadeInUp 0.8s ease 0.3s both;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 3rem;
    margin-top: 4rem;
    animation: fadeInUp 0.8s ease 0.4s both;
}

.stat {
    text-align: center;
}

.stat-number {
    font-size: 2rem;
    font-weight: 800;
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-label {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-top: 0.25rem;
}

/* ===== BUTTONS ===== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.85rem 2rem;
    border: none;
    border-radius: var(--radius-sm);
    font-family: inherit;
    font-weight: 600;
    font-size: 0.95rem;
    cursor: pointer;
    text-decoration: none;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.btn-primary {
    background: var(--gradient-1);
    color: white;
    box-shadow: 0 4px 20px rgba(108, 92, 231, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(108, 92, 231, 0.5);
}

.btn-secondary {
    background: var(--glass);
    color: var(--text-primary);
    border: 1px solid var(--glass-border);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.08);
    border-color: var(--accent-1);
    transform: translateY(-2px);
}

.btn-accent {
    background: var(--gradient-2);
    color: #1a1a2e;
    font-weight: 700;
    box-shadow: 0 4px 20px rgba(253, 121, 168, 0.3);
}

.btn-accent:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(253, 121, 168, 0.5);
}

/* ===== SECTION LAYOUT ===== */
.section {
    position: relative;
    z-index: 1;
    padding: 5rem 2rem;
}

.section-header {
    text-align: center;
    margin-bottom: 3.5rem;
}

.section-header .tag {
    display: inline-block;
    padding: 0.4rem 1rem;
    background: rgba(108, 92, 231, 0.1);
    color: var(--accent-1);
    border-radius: 50px;
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    margin-bottom: 1rem;
}

.section-header h2 {
    font-size: clamp(1.8rem, 4vw, 2.8rem);
    font-weight: 800;
    margin-bottom: 1rem;
}

.section-header p {
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
    font-size: 1.05rem;
}

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

/* ===== TOPIC CARDS ===== */
.topics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 1.5rem;
    max-width: 1200px;
    margin: 0 auto;
}

.topic-card {
    background: var(--bg-card);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius);
    padding: 2rem;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
    cursor: pointer;
    text-decoration: none;
    color: inherit;
    display: block;
}

.topic-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--card-accent, var(--gradient-1));
    opacity: 0;
    transition: var(--transition);
}

.topic-card:hover {
    background: var(--bg-card-hover);
    border-color: rgba(108, 92, 231, 0.3);
    transform: translateY(-4px);
    box-shadow: var(--shadow-glow);
}

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

.topic-card .card-icon {
    width: 50px;
    height: 50px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    margin-bottom: 1.25rem;
    background: var(--card-accent-bg, rgba(108, 92, 231, 0.15));
}

.topic-card h3 {
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.topic-card .card-desc {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.6;
    margin-bottom: 1rem;
}

.topic-card .card-meta {
    display: flex;
    align-items: center;
    gap: 1rem;
    font-size: 0.8rem;
    color: var(--text-muted);
}

.topic-card .card-meta .source {
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    padding: 0.25rem 0.6rem;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 4px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.75rem;
}

/* Card accent colors */
.topic-card[data-accent="purple"] { --card-accent: linear-gradient(135deg, #6c5ce7, #a29bfe); --card-accent-bg: rgba(108, 92, 231, 0.15); }
.topic-card[data-accent="cyan"] { --card-accent: linear-gradient(135deg, #00cec9, #81ecec); --card-accent-bg: rgba(0, 206, 201, 0.15); }
.topic-card[data-accent="pink"] { --card-accent: linear-gradient(135deg, #fd79a8, #fab1a0); --card-accent-bg: rgba(253, 121, 168, 0.15); }
.topic-card[data-accent="yellow"] { --card-accent: linear-gradient(135deg, #fdcb6e, #ffeaa7); --card-accent-bg: rgba(253, 203, 110, 0.15); }
.topic-card[data-accent="green"] { --card-accent: linear-gradient(135deg, #00b894, #55efc4); --card-accent-bg: rgba(0, 184, 148, 0.15); }
.topic-card[data-accent="orange"] { --card-accent: linear-gradient(135deg, #e17055, #fab1a0); --card-accent-bg: rgba(225, 112, 85, 0.15); }
.topic-card[data-accent="blue"] { --card-accent: linear-gradient(135deg, #0984e3, #74b9ff); --card-accent-bg: rgba(9, 132, 227, 0.15); }

/* ===== ROADMAP / TIMELINE ===== */
.roadmap {
    max-width: 800px;
    margin: 0 auto;
    position: relative;
}

.roadmap::before {
    content: '';
    position: absolute;
    left: 24px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(to bottom, var(--accent-1), var(--accent-2), var(--accent-3));
}

.roadmap-item {
    display: flex;
    gap: 2rem;
    margin-bottom: 2.5rem;
    position: relative;
    opacity: 0;
    transform: translateX(-20px);
    animation: slideInLeft 0.6s ease forwards;
}

.roadmap-item:nth-child(1) { animation-delay: 0.1s; }
.roadmap-item:nth-child(2) { animation-delay: 0.2s; }
.roadmap-item:nth-child(3) { animation-delay: 0.3s; }
.roadmap-item:nth-child(4) { animation-delay: 0.4s; }
.roadmap-item:nth-child(5) { animation-delay: 0.5s; }
.roadmap-item:nth-child(6) { animation-delay: 0.6s; }

@keyframes slideInLeft {
    to { opacity: 1; transform: translateX(0); }
}

.roadmap-dot {
    width: 50px;
    min-width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--bg-secondary);
    border: 3px solid var(--accent-1);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.9rem;
    z-index: 1;
    box-shadow: 0 0 20px rgba(108, 92, 231, 0.3);
}

.roadmap-content {
    background: var(--bg-card);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius);
    padding: 1.5rem;
    flex: 1;
}

.roadmap-content h3 {
    font-size: 1.05rem;
    margin-bottom: 0.5rem;
}

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

.roadmap-content .duration {
    display: inline-block;
    margin-top: 0.75rem;
    padding: 0.25rem 0.75rem;
    background: rgba(108, 92, 231, 0.1);
    color: var(--accent-1);
    border-radius: 50px;
    font-size: 0.75rem;
    font-weight: 600;
}

/* ===== RESUME PAGE ===== */
.resume-hero {
    background: var(--bg-card);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius);
    padding: 3rem;
    max-width: 900px;
    margin: 0 auto 3rem;
    text-align: center;
}

.resume-hero h2 {
    font-size: 1.8rem;
    margin-bottom: 1rem;
}

.resume-hero p {
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

.tips-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 1.5rem;
    max-width: 1200px;
    margin: 0 auto;
}

.tip-card {
    background: var(--bg-card);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius);
    padding: 1.75rem;
    transition: var(--transition);
}

.tip-card:hover {
    border-color: rgba(108, 92, 231, 0.3);
    transform: translateY(-2px);
}

.tip-card .tip-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    background: var(--gradient-1);
    border-radius: 8px;
    font-weight: 700;
    font-size: 0.85rem;
    color: white;
    margin-bottom: 1rem;
}

.tip-card h3 {
    font-size: 1.05rem;
    margin-bottom: 0.5rem;
}

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

.tip-card ul {
    color: var(--text-secondary);
    font-size: 0.9rem;
    padding-left: 1.2rem;
    margin-top: 0.5rem;
}

.tip-card ul li {
    margin-bottom: 0.3rem;
}

/* ===== QUIZ / FLASHCARD PAGE ===== */
.quiz-container {
    max-width: 700px;
    margin: 0 auto;
}

.quiz-progress {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 2rem;
}

.quiz-progress .progress-bar {
    flex: 1;
    height: 6px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 3px;
    overflow: hidden;
}

.quiz-progress .progress-fill {
    height: 100%;
    background: var(--gradient-1);
    border-radius: 3px;
    transition: width 0.5s ease;
}

.quiz-progress .progress-text {
    font-size: 0.85rem;
    color: var(--text-muted);
    font-family: 'JetBrains Mono', monospace;
    min-width: 60px;
    text-align: right;
}

.flashcard {
    perspective: 1000px;
    height: 380px;
    margin-bottom: 2rem;
    cursor: pointer;
}

.flashcard-inner {
    position: relative;
    width: 100%;
    height: 100%;
    transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
    transform-style: preserve-3d;
}

.flashcard.flipped .flashcard-inner {
    transform: rotateY(180deg);
}

.flashcard-front, .flashcard-back {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    border-radius: var(--radius);
    border: 1px solid var(--glass-border);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 2.5rem;
    text-align: center;
}

.flashcard-front {
    background: var(--bg-card);
}

.flashcard-front .card-label {
    position: absolute;
    top: 1.5rem;
    left: 1.5rem;
    padding: 0.3rem 0.8rem;
    background: rgba(108, 92, 231, 0.15);
    color: var(--accent-1);
    border-radius: 6px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.flashcard-front .flip-hint {
    position: absolute;
    bottom: 1.5rem;
    color: var(--text-muted);
    font-size: 0.8rem;
    display: flex;
    align-items: center;
    gap: 0.4rem;
}

.flashcard-front h3 {
    font-size: 1.3rem;
    font-weight: 600;
    line-height: 1.5;
}

.flashcard-back {
    background: linear-gradient(135deg, rgba(108, 92, 231, 0.1), rgba(0, 206, 201, 0.1));
    border-color: rgba(108, 92, 231, 0.2);
    transform: rotateY(180deg);
}

.flashcard-back .card-label {
    position: absolute;
    top: 1.5rem;
    left: 1.5rem;
    padding: 0.3rem 0.8rem;
    background: rgba(0, 206, 201, 0.15);
    color: var(--accent-2);
    border-radius: 6px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.flashcard-back p {
    font-size: 1.05rem;
    line-height: 1.7;
    color: var(--text-primary);
}

.quiz-controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
}

.quiz-controls .btn {
    min-width: 120px;
    justify-content: center;
}

.confidence-btns {
    display: flex;
    gap: 0.5rem;
}

.confidence-btns .btn {
    padding: 0.6rem 1.2rem;
    font-size: 0.85rem;
    min-width: auto;
}

.btn-know {
    background: rgba(0, 184, 148, 0.15);
    color: #00b894;
    border: 1px solid rgba(0, 184, 148, 0.3);
}

.btn-know:hover {
    background: rgba(0, 184, 148, 0.25);
}

.btn-review {
    background: rgba(253, 203, 110, 0.15);
    color: #fdcb6e;
    border: 1px solid rgba(253, 203, 110, 0.3);
}

.btn-review:hover {
    background: rgba(253, 203, 110, 0.25);
}

.btn-dunno {
    background: rgba(253, 121, 168, 0.15);
    color: #fd79a8;
    border: 1px solid rgba(253, 121, 168, 0.3);
}

.btn-dunno:hover {
    background: rgba(253, 121, 168, 0.25);
}

/* Category filter */
.filter-bar {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
    justify-content: center;
    margin-bottom: 2rem;
}

.filter-btn {
    padding: 0.5rem 1.2rem;
    background: var(--glass);
    border: 1px solid var(--glass-border);
    border-radius: 50px;
    color: var(--text-secondary);
    font-family: inherit;
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

.filter-btn:hover {
    background: rgba(108, 92, 231, 0.1);
    border-color: rgba(108, 92, 231, 0.3);
    color: var(--text-primary);
}

.filter-btn.active {
    background: rgba(108, 92, 231, 0.2);
    border-color: var(--accent-1);
    color: var(--text-primary);
}

/* Quiz Score */
.quiz-score {
    text-align: center;
    padding: 3rem;
    background: var(--bg-card);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius);
}

.score-circle {
    width: 150px;
    height: 150px;
    border-radius: 50%;
    margin: 0 auto 1.5rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    border: 4px solid var(--accent-1);
    box-shadow: 0 0 30px rgba(108, 92, 231, 0.3);
}

.score-circle .score-value {
    font-size: 2.5rem;
    font-weight: 900;
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.score-circle .score-label {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.score-breakdown {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-top: 1.5rem;
}

.score-stat {
    text-align: center;
}

.score-stat .value {
    font-size: 1.5rem;
    font-weight: 700;
}

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

.score-stat.knew .value { color: #00b894; }
.score-stat.review .value { color: #fdcb6e; }
.score-stat.missed .value { color: #fd79a8; }

/* ===== PAGE HEADER ===== */
.page-header {
    position: relative;
    z-index: 1;
    padding: 8rem 2rem 3rem;
    text-align: center;
}

.page-header h1 {
    font-size: clamp(2rem, 5vw, 3.2rem);
    font-weight: 900;
    margin-bottom: 1rem;
}

.page-header p {
    color: var(--text-secondary);
    font-size: 1.1rem;
    max-width: 600px;
    margin: 0 auto;
}

/* ===== FOOTER ===== */
.footer {
    position: relative;
    z-index: 1;
    padding: 3rem 2rem;
    border-top: 1px solid var(--glass-border);
    text-align: center;
    color: var(--text-muted);
    font-size: 0.85rem;
}

.footer a {
    color: var(--accent-1);
    text-decoration: none;
}

.footer a:hover {
    text-decoration: underline;
}

.footer .footer-links {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-bottom: 1rem;
}

/* ===== ANIMATIONS ===== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.animate-on-scroll {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.animate-on-scroll.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ===== TOPIC DETAILS (Expandable) ===== */
.topic-detail {
    max-width: 900px;
    margin: 0 auto;
}

.topic-section {
    background: var(--bg-card);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius);
    margin-bottom: 1rem;
    overflow: hidden;
}

.topic-section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1.25rem 1.5rem;
    cursor: pointer;
    transition: var(--transition);
}

.topic-section-header:hover {
    background: rgba(255, 255, 255, 0.02);
}

.topic-section-header h3 {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1rem;
    font-weight: 600;
}

.topic-section-header .toggle-icon {
    transition: transform 0.3s ease;
    color: var(--text-muted);
}

.topic-section.open .toggle-icon {
    transform: rotate(180deg);
}

.topic-section-body {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease;
}

.topic-section.open .topic-section-body {
    max-height: 2000px;
}

.topic-section-body .content {
    padding: 0 1.5rem 1.5rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.7;
}

.topic-section-body .content ul {
    padding-left: 1.5rem;
    margin-top: 0.5rem;
}

.topic-section-body .content li {
    margin-bottom: 0.4rem;
}

.topic-section-body .content a {
    color: var(--accent-2);
    text-decoration: none;
}

.topic-section-body .content a:hover {
    text-decoration: underline;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
    .nav-links {
        display: none;
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: rgba(10, 10, 26, 0.98);
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 1rem;
        z-index: 999;
    }

    .nav-links.open {
        display: flex;
    }

    .nav-links a {
        font-size: 1.2rem;
        padding: 1rem 2rem;
    }

    .mobile-menu-btn {
        display: block;
        z-index: 1001;
    }

    .hero-stats {
        gap: 1.5rem;
    }

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

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

    .quiz-controls {
        flex-direction: column;
    }

    .confidence-btns {
        width: 100%;
        justify-content: center;
    }

    .roadmap::before {
        left: 20px;
    }

    .roadmap-dot {
        width: 40px;
        min-width: 40px;
        height: 40px;
        font-size: 0.8rem;
    }

    .roadmap-item {
        gap: 1.25rem;
    }

    .filter-bar {
        overflow-x: auto;
        flex-wrap: nowrap;
        justify-content: flex-start;
        padding-bottom: 0.5rem;
        -webkit-overflow-scrolling: touch;
    }

    .filter-btn {
        white-space: nowrap;
        flex-shrink: 0;
    }

    .flashcard {
        height: 320px;
    }
}

@media (max-width: 480px) {
    .hero h1 {
        font-size: 2rem;
    }

    .hero-stats {
        flex-direction: column;
        gap: 1rem;
    }

    .score-breakdown {
        flex-direction: column;
        gap: 1rem;
    }
}

/* ===== MISC ===== */
.mono {
    font-family: 'JetBrains Mono', monospace;
}

.text-gradient {
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.divider {
    width: 60px;
    height: 3px;
    background: var(--gradient-1);
    border-radius: 2px;
    margin: 1.5rem auto;
}

/* ===== HOW TO USE STEPS ===== */
.steps-container {
    display: flex;
    align-items: stretch;
    justify-content: center;
    gap: 0;
    max-width: 1200px;
    margin: 0 auto;
    flex-wrap: wrap;
}

.step-card {
    background: var(--bg-card);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius);
    padding: 2rem 1.5rem;
    text-align: center;
    flex: 1;
    min-width: 220px;
    max-width: 260px;
    position: relative;
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    align-items: center;
}

.step-card:hover {
    border-color: rgba(108, 92, 231, 0.4);
    transform: translateY(-4px);
    box-shadow: var(--shadow-glow);
}

.step-number {
    position: absolute;
    top: -14px;
    left: 50%;
    transform: translateX(-50%);
    width: 28px;
    height: 28px;
    background: var(--gradient-1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    font-size: 0.8rem;
    color: white;
    box-shadow: 0 0 15px rgba(108, 92, 231, 0.4);
}

.step-icon {
    font-size: 2.5rem;
    margin: 0.75rem 0 1rem;
}

.step-card h3 {
    font-size: 1.05rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.step-card p {
    color: var(--text-secondary);
    font-size: 0.85rem;
    line-height: 1.6;
    flex: 1;
}

.step-connector {
    display: flex;
    align-items: center;
    font-size: 1.5rem;
    color: var(--accent-1);
    padding: 0 0.75rem;
    font-weight: 700;
    opacity: 0.5;
}

@media (max-width: 768px) {
    .steps-container {
        flex-direction: column;
        align-items: center;
        gap: 1rem;
    }
    .step-card {
        max-width: 100%;
        width: 100%;
    }
    .step-connector {
        transform: rotate(90deg);
        padding: 0;
    }
}

/* ===== STUDY PLAN PAGE ===== */
.plan-selector {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 3rem;
}

.plan-tab {
    padding: 0.75rem 2rem;
    background: var(--glass);
    border: 2px solid var(--glass-border);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-family: inherit;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.plan-tab:hover {
    border-color: rgba(108, 92, 231, 0.3);
    color: var(--text-primary);
}

.plan-tab.active {
    background: rgba(108, 92, 231, 0.15);
    border-color: var(--accent-1);
    color: var(--text-primary);
    box-shadow: 0 0 20px rgba(108, 92, 231, 0.2);
}

.plan-content {
    display: none;
    max-width: 900px;
    margin: 0 auto;
}

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

.plan-week {
    background: var(--bg-card);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius);
    margin-bottom: 1.5rem;
    overflow: hidden;
}

.plan-week-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1.25rem 1.5rem;
    cursor: pointer;
    transition: var(--transition);
}

.plan-week-header:hover {
    background: rgba(255, 255, 255, 0.02);
}

.plan-week-header h3 {
    font-size: 1.05rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.plan-week-header .week-progress {
    font-size: 0.8rem;
    color: var(--text-muted);
    font-family: 'JetBrains Mono', monospace;
}

.plan-week-header .toggle-icon {
    transition: transform 0.3s ease;
    color: var(--text-muted);
}

.plan-week.open .toggle-icon {
    transform: rotate(180deg);
}

.plan-week-body {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease;
}

.plan-week.open .plan-week-body {
    max-height: 3000px;
}

.plan-day {
    padding: 1rem 1.5rem;
    border-top: 1px solid rgba(255, 255, 255, 0.04);
}

.plan-day-header {
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--accent-2);
    margin-bottom: 0.5rem;
}

.plan-task {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    padding: 0.5rem 0;
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

.plan-task input[type="checkbox"] {
    appearance: none;
    -webkit-appearance: none;
    width: 20px;
    height: 20px;
    min-width: 20px;
    border: 2px solid rgba(108, 92, 231, 0.4);
    border-radius: 4px;
    background: transparent;
    cursor: pointer;
    margin-top: 1px;
    transition: var(--transition);
    position: relative;
}

.plan-task input[type="checkbox"]:checked {
    background: var(--accent-1);
    border-color: var(--accent-1);
}

.plan-task input[type="checkbox"]:checked::after {
    content: '✓';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: white;
    font-size: 0.7rem;
    font-weight: 700;
}

.plan-task.completed label {
    text-decoration: line-through;
    color: var(--text-muted);
}

.plan-overall-progress {
    background: var(--bg-card);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius);
    padding: 1.5rem 2rem;
    max-width: 900px;
    margin: 0 auto 2rem;
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.plan-overall-progress .progress-bar {
    flex: 1;
    height: 10px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 5px;
    overflow: hidden;
}

.plan-overall-progress .progress-fill {
    height: 100%;
    background: var(--gradient-1);
    border-radius: 5px;
    transition: width 0.5s ease;
}

.plan-overall-progress .progress-label {
    font-weight: 700;
    font-size: 0.9rem;
    min-width: 80px;
    text-align: right;
    font-family: 'JetBrains Mono', monospace;
}

.plan-reset-btn {
    padding: 0.5rem 1.2rem;
    background: rgba(253, 121, 168, 0.1);
    border: 1px solid rgba(253, 121, 168, 0.3);
    border-radius: var(--radius-sm);
    color: #fd79a8;
    font-family: inherit;
    font-size: 0.8rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.plan-reset-btn:hover {
    background: rgba(253, 121, 168, 0.2);
}

/* Floating particles */
.particle {
    position: fixed;
    width: 4px;
    height: 4px;
    background: var(--accent-1);
    border-radius: 50%;
    pointer-events: none;
    z-index: 0;
    opacity: 0;
    animation: floatParticle 15s linear infinite;
}

@keyframes floatParticle {
    0% { opacity: 0; transform: translateY(100vh) scale(0); }
    10% { opacity: 0.6; }
    90% { opacity: 0.6; }
    100% { opacity: 0; transform: translateY(-10vh) scale(1); }
}