/* ===== CSS Variables ===== */
:root {
    --bg-primary: #0a0a0f;
    --bg-secondary: #12121a;
    --bg-card: #16161f;
    --text-primary: #ffffff;
    --text-secondary: #a0a0b0;
    --text-muted: #6b6b7b;
    --accent-primary: #6366f1;
    --accent-secondary: #8b5cf6;
    --accent-tertiary: #a855f7;
    --gradient-start: #6366f1;
    --gradient-end: #a855f7;
    --border-color: rgba(255, 255, 255, 0.08);
    --glow-color: rgba(99, 102, 241, 0.4);
    --font-heading: 'Syne', sans-serif;
    --font-mono: 'Space Mono', monospace;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-heading);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

/* ===== Utility Classes ===== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

.gradient-text {
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ===== Navigation ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 20px 0;
    background: rgba(10, 10, 15, 0.8);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: 800;
    text-decoration: none;
    color: var(--text-primary);
    letter-spacing: -0.02em;
}

.logo span {
    color: var(--accent-primary);
}

.nav-links {
    display: flex;
    gap: 40px;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    transition: color 0.3s ease;
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent-primary);
    transition: width 0.3s ease;
}

.nav-links a:hover {
    color: var(--text-primary);
}

.nav-links a:hover::after {
    width: 100%;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
}

.nav-toggle span {
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    transition: all 0.3s ease;
}

/* ===== Hero Section ===== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    padding: 120px 24px 80px;
}

.hero-bg {
    position: absolute;
    inset: 0;
    overflow: hidden;
}

.grid-overlay {
    position: absolute;
    inset: 0;
    background-image: 
        linear-gradient(rgba(99, 102, 241, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(99, 102, 241, 0.03) 1px, transparent 1px);
    background-size: 60px 60px;
    mask-image: radial-gradient(ellipse at center, black 30%, transparent 70%);
}

.gradient-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(100px);
    opacity: 0.6;
}

.orb-1 {
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, var(--accent-primary) 0%, transparent 70%);
    top: -200px;
    right: -200px;
}

.orb-2 {
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, var(--accent-tertiary) 0%, transparent 70%);
    bottom: -100px;
    left: -100px;
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 800px;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background: rgba(99, 102, 241, 0.1);
    border: 1px solid rgba(99, 102, 241, 0.3);
    border-radius: 100px;
    font-size: 0.85rem;
    color: var(--accent-primary);
    margin-bottom: 32px;
    font-family: var(--font-mono);
}

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

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.5; transform: scale(1.2); }
}

.hero h1 {
    font-size: clamp(3rem, 8vw, 5.5rem);
    font-weight: 800;
    line-height: 1.05;
    letter-spacing: -0.03em;
    margin-bottom: 24px;
}

.hero-subtitle {
    font-size: 1.2rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto 48px;
    line-height: 1.7;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 48px;
    margin-bottom: 48px;
}

.stat {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 2.5rem;
    font-weight: 800;
    font-family: var(--font-mono);
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-label {
    font-size: 0.85rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.cta-button {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    padding: 16px 32px;
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    color: white;
    text-decoration: none;
    font-weight: 600;
    font-size: 1rem;
    border-radius: 12px;
    transition: all 0.3s ease;
    box-shadow: 0 4px 30px rgba(99, 102, 241, 0.3);
}

.cta-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 40px rgba(99, 102, 241, 0.4);
}

.cta-button.large {
    padding: 20px 40px;
    font-size: 1.1rem;
}

.scroll-indicator {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    color: var(--text-muted);
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.2em;
}

.scroll-line {
    width: 1px;
    height: 40px;
    background: linear-gradient(to bottom, var(--accent-primary), transparent);
    animation: scrollBounce 2s infinite;
}

@keyframes scrollBounce {
    0%, 100% { transform: scaleY(1); opacity: 1; }
    50% { transform: scaleY(0.5); opacity: 0.5; }
}

/* ===== Value Section ===== */
.value-section {
    padding: 120px 0;
    background: var(--bg-secondary);
}

.value-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 32px;
}

.value-card {
    padding: 40px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    text-align: center;
    transition: all 0.3s ease;
}

.value-card:hover {
    transform: translateY(-8px);
    border-color: rgba(99, 102, 241, 0.3);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

.value-icon {
    font-size: 3rem;
    margin-bottom: 24px;
}

.value-card h3 {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 16px;
}

.value-card p {
    color: var(--text-secondary);
    line-height: 1.7;
}

/* ===== Section Headers ===== */
.section-header {
    text-align: center;
    margin-bottom: 80px;
}

.section-tag {
    display: inline-block;
    padding: 6px 16px;
    background: rgba(99, 102, 241, 0.1);
    border: 1px solid rgba(99, 102, 241, 0.2);
    border-radius: 100px;
    font-size: 0.8rem;
    color: var(--accent-primary);
    font-family: var(--font-mono);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: 24px;
}

.section-header h2 {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 800;
    line-height: 1.1;
    letter-spacing: -0.02em;
    margin-bottom: 20px;
}

.section-header p {
    color: var(--text-secondary);
    font-size: 1.1rem;
    max-width: 500px;
    margin: 0 auto;
}

/* ===== Tutors Section ===== */
.tutors-section {
    padding: 120px 0;
    background: var(--bg-primary);
}

.tutors-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
    align-items: start;
}

.tutor-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 24px;
    padding: 40px;
    text-align: center;
    position: relative;
    transition: all 0.4s ease;
}

.tutor-card:hover {
    transform: translateY(-12px);
    border-color: rgba(99, 102, 241, 0.4);
    box-shadow: 0 30px 80px rgba(0, 0, 0, 0.4);
}

.tutor-card.featured {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.1), rgba(168, 85, 247, 0.1));
    border-color: rgba(99, 102, 241, 0.3);
    transform: scale(1.05);
}

.tutor-card.featured:hover {
    transform: scale(1.05) translateY(-12px);
}

.featured-badge {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    padding: 6px 16px;
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    border-radius: 100px;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.tutor-image {
    position: relative;
    margin-bottom: 28px;
}

.tutor-placeholder {
    width: 120px;
    height: 120px;
    margin: 0 auto;
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    font-weight: 800;
    letter-spacing: -0.02em;
}

.tutor-glow {
    position: absolute;
    inset: -20px;
    background: radial-gradient(circle, var(--glow-color), transparent 70%);
    border-radius: 50%;
    opacity: 0;
    transition: opacity 0.4s ease;
    z-index: -1;
}

.tutor-card:hover .tutor-glow {
    opacity: 1;
}

.tutor-info h3 {
    font-size: 1.4rem;
    font-weight: 700;
    margin-bottom: 20px;
}

.tutor-scores {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 24px;
    margin-bottom: 20px;
    padding: 16px;
    background: rgba(0, 0, 0, 0.3);
    border-radius: 12px;
}

.score {
    text-align: center;
}

.score-value {
    display: block;
    font-size: 1.8rem;
    font-weight: 800;
    font-family: var(--font-mono);
    color: var(--text-primary);
}

.score-label {
    font-size: 0.7rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.15em;
}

.score-divider {
    width: 1px;
    height: 40px;
    background: var(--border-color);
}

.tutor-bio {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.7;
}

/* ===== Subjects Section ===== */
.subjects-section {
    padding: 120px 0;
    background: var(--bg-secondary);
}

.subjects-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.subject-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 28px;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.subject-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--gradient-start), var(--gradient-end));
    opacity: 0;
    transition: opacity 0.3s ease;
}

.subject-card:hover {
    transform: translateY(-4px);
    border-color: rgba(99, 102, 241, 0.3);
}

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

.subject-level {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 6px;
    font-size: 0.7rem;
    font-weight: 700;
    font-family: var(--font-mono);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 16px;
}

.subject-level.hl {
    background: rgba(239, 68, 68, 0.15);
    color: #ef4444;
}

.subject-level.sl {
    background: rgba(34, 197, 94, 0.15);
    color: #22c55e;
}

.subject-level.sl-hl {
    background: rgba(251, 191, 36, 0.15);
    color: #fbbf24;
}

.subject-level.ab {
    background: rgba(59, 130, 246, 0.15);
    color: #3b82f6;
}

.subject-card h4 {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 10px;
}

.subject-card p {
    color: var(--text-muted);
    font-size: 0.9rem;
    line-height: 1.6;
}

/* ===== CTA Section ===== */
.cta-section {
    padding: 160px 0;
    position: relative;
    overflow: hidden;
}

.cta-bg {
    position: absolute;
    inset: 0;
}

.orb-3 {
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, var(--accent-primary) 0%, transparent 70%);
    top: -150px;
    left: -150px;
}

.orb-4 {
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, var(--accent-tertiary) 0%, transparent 70%);
    bottom: -100px;
    right: -100px;
}

.cta-content {
    position: relative;
    z-index: 1;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.cta-content h2 {
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 24px;
}

.cta-content p {
    color: var(--text-secondary);
    font-size: 1.2rem;
    margin-bottom: 32px;
}

.pricing-box {
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    padding: 24px 48px;
    background: rgba(99, 102, 241, 0.1);
    border: 1px solid rgba(99, 102, 241, 0.3);
    border-radius: 16px;
    margin-bottom: 32px;
    position: relative;
}

.intro-badge {
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    padding: 4px 12px;
    border-radius: 100px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 8px;
}

.price {
    font-size: 3rem;
    font-weight: 800;
    font-family: var(--font-mono);
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.price-unit {
    font-size: 1.2rem;
    font-weight: 600;
}

.price-detail {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-top: 4px;
}

.cta-section .pricing-box {
    margin-bottom: 48px;
}

/* ===== Footer ===== */
.footer {
    padding: 40px 0;
    border-top: 1px solid var(--border-color);
    background: var(--bg-primary);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.footer p {
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* ===== Responsive Design ===== */
@media (max-width: 1024px) {
    .tutors-grid {
        grid-template-columns: 1fr;
        max-width: 400px;
        margin: 0 auto;
    }
    
    .tutor-card.featured {
        transform: none;
    }
    
    .tutor-card.featured:hover {
        transform: translateY(-12px);
    }
    
    .subjects-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        flex-direction: column;
        background: var(--bg-secondary);
        padding: 24px;
        gap: 20px;
        border-bottom: 1px solid var(--border-color);
    }
    
    .nav-links.active {
        display: flex;
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .hero-stats {
        gap: 24px;
    }
    
    .stat-number {
        font-size: 2rem;
    }
    
    .value-grid {
        grid-template-columns: 1fr;
    }
    
    .subjects-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        flex-direction: column;
        gap: 16px;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .hero h1 {
        font-size: 2.5rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .hero-stats {
        flex-direction: column;
        gap: 16px;
    }
    
    .cta-button {
        width: 100%;
        justify-content: center;
    }
}

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

.hero-content > * {
    animation: fadeInUp 0.8s ease forwards;
    opacity: 0;
}

.hero-badge { animation-delay: 0.1s; }
.hero h1 { animation-delay: 0.2s; }
.hero-subtitle { animation-delay: 0.3s; }
.hero-stats { animation-delay: 0.4s; }
.hero .cta-button { animation-delay: 0.5s; }