@import url('https://fonts.googleapis.com/css2?family=Syne:wght@400;500;600;700;800&display=swap');
@import url('https://fonts.googleapis.com/css2?family=DM+Sans:wght@300;400;500&display=swap');

:root {
    --bg-main: #0A0F1E;
    --bg-surface: #111827;
    --bg-card: #161D2F;
    --primary: #00C896;
    --primary-dark: #00A87D;
    --accent: #FFD166;
    --accent2: #FF6B6B;
    --text-primary: #F0F4FF;
    --text-muted: #8892A4;
    --border: rgba(255,255,255,0.07);
    --border-bright: rgba(0,200,150,0.25);
}

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

body {
    background-color: var(--bg-main);
    color: var(--text-primary);
    font-family: 'DM Sans', sans-serif;
    line-height: 1.6;
    overflow-x: hidden;
}

h1, h2, h3, h4 {
    font-family: 'Syne', sans-serif;
    line-height: 1.1;
}

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

/* ─── Navbar ─── */
.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 80px;
    background-color: rgba(10, 15, 30, 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo-icon {
    width: 40px;
    height: 40px;
    background: rgba(0,200,150,0.1);
    border: 1px solid var(--border-bright);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.logo-icon--sm {
    width: 32px;
    height: 32px;
    border-radius: 8px;
}

.logo-text {
    font-family: 'Syne', sans-serif;
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--text-primary);
    letter-spacing: -0.02em;
}

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

.nav-links a {
    text-decoration: none;
    color: var(--text-muted);
    font-weight: 500;
    font-size: 0.9rem;
    transition: color 0.2s;
}

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

.btn-pill {
    background: var(--primary);
    color: #0A0F1E;
    padding: 10px 24px;
    border-radius: 100px;
    text-decoration: none;
    font-weight: 700;
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    gap: 6px;
    transition: background 0.2s, transform 0.2s;
}

.btn-pill:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
}

/* ─── Hero ─── */
.hero {
    min-height: 92vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 120px 40px 80px;
    position: relative;
    overflow: hidden;
}

.hero-grid-bg {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(0,200,150,0.04) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0,200,150,0.04) 1px, transparent 1px);
    background-size: 50px 50px;
    z-index: 0;
    mask-image: radial-gradient(ellipse 80% 60% at 50% 40%, black 30%, transparent 100%);
}

.hero > * {
    position: relative;
    z-index: 1;
}

.badge {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    background: rgba(0,200,150,0.08);
    border: 1px solid var(--border-bright);
    padding: 8px 20px;
    border-radius: 100px;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--primary);
    margin-bottom: 36px;
    letter-spacing: 0.04em;
    text-transform: uppercase;
}

.badge-dot {
    width: 7px;
    height: 7px;
    background: var(--primary);
    border-radius: 50%;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.5; transform: scale(0.85); }
}

.hero h1 {
    font-family: 'Syne', sans-serif;
    font-size: 5.5rem;
    font-weight: 800;
    color: var(--text-primary);
    max-width: 900px;
    margin-bottom: 28px;
    line-height: 1.0;
    letter-spacing: -0.03em;
}

.hero p {
    font-size: 1.15rem;
    color: var(--text-muted);
    max-width: 580px;
    margin-bottom: 52px;
    font-weight: 400;
    line-height: 1.7;
}

.hero-actions {
    display: flex;
    align-items: center;
    gap: 24px;
    margin-bottom: 72px;
}

.btn-cta {
    background: var(--primary);
    color: #0A0F1E;
    padding: 16px 40px;
    border-radius: 100px;
    text-decoration: none;
    font-family: 'Syne', sans-serif;
    font-weight: 700;
    font-size: 1rem;
    display: flex;
    align-items: center;
    gap: 10px;
    transition: background 0.2s, transform 0.2s;
}

.btn-cta:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
}

.btn-cta--light {
    background: white;
    color: #0A0F1E;
    font-size: 1.1rem;
    padding: 18px 48px;
}

.btn-cta--light:hover {
    background: #e8f5f1;
    transform: translateY(-2px);
}

.link-action {
    color: var(--text-muted);
    text-decoration: none;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 6px;
    transition: color 0.2s;
}

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

/* Hero Stats */
.hero-stats {
    display: flex;
    align-items: center;
    gap: 48px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    padding: 24px 48px;
    border-radius: 24px;
    margin-bottom: 60px;
}

.stat {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
}

.stat-num {
    font-family: 'Syne', sans-serif;
    font-size: 2rem;
    font-weight: 800;
    color: var(--primary);
    letter-spacing: -0.03em;
}

.stat-label {
    font-size: 0.8rem;
    color: var(--text-muted);
    font-weight: 500;
}

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

/* Floating Cards */
.floating-card {
    position: absolute;
    width: 280px;
    background: var(--bg-card);
    padding: 12px;
    border-radius: 28px;
    border: 1px solid var(--border);
    overflow: hidden;
    z-index: 1;
}

.floating-card img {
    width: 100%;
    height: auto;
    aspect-ratio: 1 / 1;
    object-fit: cover;
    border-radius: 18px;
    background: var(--bg-surface);
}

.card-left {
    left: 40px;
    top: 50%;
    transform: translateY(-50%) rotate(-3deg);
}

.card-right {
    right: 40px;
    bottom: 18%;
    transform: rotate(3deg);
}

/* ─── Section Labels ─── */
.section-label {
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.12em;
    color: var(--primary);
    text-transform: uppercase;
    margin-bottom: 16px;
}

/* ─── Features ─── */
.features {
    padding: 120px 80px;
    background: var(--bg-surface);
}

.features h2 {
    font-family: 'Syne', sans-serif;
    font-size: 3.8rem;
    font-weight: 800;
    letter-spacing: -0.03em;
    margin-bottom: 60px;
    max-width: 600px;
}

.feature-grid {
    display: grid;
    grid-template-columns: 1.3fr 1fr 1fr;
    gap: 20px;
    max-width: 1200px;
}

.feature-card {
    padding: 48px 36px;
    border-radius: 28px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    transition: border-color 0.3s, transform 0.3s;
}

.feature-card:hover {
    border-color: var(--border-bright);
    transform: translateY(-4px);
}

.feature-card--large {
    grid-row: span 1;
}

.f-icon-box {
    width: 64px;
    height: 64px;
    background: rgba(0,200,150,0.08);
    border: 1px solid var(--border-bright);
    border-radius: 18px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 28px;
}

.feature-card h3 {
    font-family: 'Syne', sans-serif;
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 14px;
    letter-spacing: -0.02em;
}

.feature-card p {
    color: var(--text-muted);
    font-size: 0.95rem;
    line-height: 1.7;
    margin-bottom: 24px;
}

.feature-tag {
    display: inline-block;
    background: rgba(0,200,150,0.1);
    color: var(--primary);
    border: 1px solid var(--border-bright);
    padding: 4px 14px;
    border-radius: 100px;
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.04em;
    text-transform: uppercase;
}

/* ─── Teacher Flow ─── */
.teacher-flow {
    padding: 120px 80px;
    background: var(--bg-main);
}

.student-section {
    background: var(--bg-surface);
}

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

.flow-step {
    display: flex;
    align-items: center;
    gap: 80px;
    margin-bottom: 100px;
}

.flow-step--reverse {
    flex-direction: row-reverse;
}

.flow-content {
    flex: 1;
}

.step-badge {
    color: var(--primary);
    font-weight: 700;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: 16px;
    display: block;
    font-family: 'DM Sans', sans-serif;
}

.flow-content h3 {
    font-family: 'Syne', sans-serif;
    font-size: 2.8rem;
    font-weight: 800;
    margin-bottom: 20px;
    letter-spacing: -0.03em;
}

.flow-content p {
    font-size: 1.05rem;
    color: var(--text-muted);
    line-height: 1.8;
}

.flow-image {
    flex: 1.4;
    border-radius: 32px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    overflow: hidden;
    transition: border-color 0.3s;
}

.flow-image:hover {
    border-color: var(--border-bright);
}

.flow-image img {
    width: 100%;
    height: auto;
    display: block;
    transition: transform 0.4s ease;
}

.flow-image:hover img {
    transform: scale(1.02);
}

/* ─── Tech Stack ─── */
.tech-stack {
    padding: 80px 40px;
    background: var(--primary);
    border-radius: 48px;
    margin: 0 40px 40px;
    text-align: center;
}

.tech-stack .section-label {
    color: rgba(10,15,30,0.6);
    margin-bottom: 16px;
}

.tech-stack h2 {
    font-family: 'Syne', sans-serif;
    font-size: 3rem;
    font-weight: 800;
    color: #0A0F1E;
    margin-bottom: 12px;
    letter-spacing: -0.03em;
}

.tech-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
    max-width: 1200px;
    margin: 48px auto 0;
}

.tech-card {
    background: rgba(10,15,30,0.15);
    padding: 32px 24px;
    border-radius: 24px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 14px;
    transition: background 0.2s;
}

.tech-card:hover {
    background: rgba(10,15,30,0.25);
}

.t-icon {
    width: 56px;
    height: 56px;
    background: white;
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.6rem;
}

.tech-info h4 {
    font-family: 'Syne', sans-serif;
    font-size: 1rem;
    font-weight: 700;
    color: #0A0F1E;
    margin-bottom: 6px;
}

.tech-info p {
    font-size: 0.82rem;
    color: rgba(10,15,30,0.65);
    line-height: 1.5;
}

.tech-tag {
    display: inline-block;
    background: #0A0F1E;
    color: var(--primary);
    padding: 3px 12px;
    border-radius: 8px;
    font-size: 0.65rem;
    font-weight: 800;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    margin-top: 6px;
}

/* ─── CTA Section ─── */
.cta-section {
    padding: 40px;
}

.cta-inner {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 48px;
    padding: 100px 80px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.cta-glow {
    position: absolute;
    width: 500px;
    height: 300px;
    background: radial-gradient(ellipse, rgba(0,200,150,0.12) 0%, transparent 70%);
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    pointer-events: none;
}

.cta-inner h2 {
    font-family: 'Syne', sans-serif;
    font-size: 4rem;
    font-weight: 800;
    letter-spacing: -0.03em;
    margin-bottom: 24px;
}

.cta-inner p {
    color: var(--text-muted);
    font-size: 1.1rem;
    max-width: 600px;
    margin: 0 auto 40px;
    line-height: 1.7;
}

/* ─── Footer ─── */
.main-footer {
    padding: 80px 80px 40px;
    background: var(--bg-surface);
    border-top: 1px solid var(--border);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 80px;
    max-width: 1200px;
    margin: 0 auto 60px;
}

.footer-brand p {
    color: var(--text-muted);
    font-size: 0.95rem;
    max-width: 300px;
    line-height: 1.7;
}

.footer-brand .logo-text {
    color: var(--text-primary);
}

.footer-links h4 {
    font-family: 'Syne', sans-serif;
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 28px;
    letter-spacing: 0.02em;
}

.footer-links ul {
    list-style: none;
}

.footer-links li {
    margin-bottom: 14px;
}

.footer-links a {
    text-decoration: none;
    color: var(--text-muted);
    font-size: 0.9rem;
    font-weight: 400;
    transition: color 0.2s;
}

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

.footer-bottom {
    padding-top: 32px;
    border-top: 1px solid var(--border);
    text-align: center;
}

.footer-bottom p {
    color: var(--text-muted);
    font-size: 0.85rem;
}

/* ─── Responsive ─── */
@media (max-width: 1200px) {
    .navbar { padding: 12px 40px; }
    .hero h1 { font-size: 4rem; }
    .floating-card { display: none; }
    .features, .teacher-flow { padding: 80px 40px; }
    .feature-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 1024px) {
    .hero h1 { font-size: 3.2rem; }
    .tech-grid { grid-template-columns: repeat(2, 1fr); }
    .flow-step { gap: 40px; margin-bottom: 60px; }
    .flow-content h3 { font-size: 2rem; }
    .tech-stack { margin: 0 20px 20px; border-radius: 32px; }
    .hero-stats { gap: 24px; padding: 20px 32px; }
    .footer-grid { grid-template-columns: 1fr 1fr; gap: 40px; }
}

@media (max-width: 768px) {
    .navbar { padding: 12px 20px; }
    .nav-links { display: none; }
    .hero { padding: 60px 20px 40px; }
    .hero h1 { font-size: 2.6rem; }
    .hero p { font-size: 1rem; }
    .hero-actions { flex-direction: column; gap: 16px; }
    .btn-cta { width: 100%; justify-content: center; padding: 14px 32px; }
    .hero-stats { flex-direction: column; gap: 20px; padding: 24px; width: 100%; }
    .stat-divider { width: 80px; height: 1px; }
    .features { padding: 60px 20px; }
    .features h2 { font-size: 2.4rem; }
    .feature-grid { grid-template-columns: 1fr; gap: 16px; }
    .feature-card { padding: 32px 24px; }
    .teacher-flow { padding: 60px 20px; }
    .flow-step, .flow-step--reverse { flex-direction: column !important; gap: 24px; margin-bottom: 60px; }
    .flow-content h3 { font-size: 1.8rem; }
    .tech-stack { padding: 60px 20px; margin: 0 16px 16px; }
    .tech-grid { grid-template-columns: 1fr; }
    .cta-section { padding: 20px; }
    .cta-inner { padding: 60px 24px; border-radius: 32px; }
    .cta-inner h2 { font-size: 2.4rem; }
    .main-footer { padding: 60px 20px 30px; }
    .footer-grid { grid-template-columns: 1fr; gap: 32px; text-align: center; }
    .footer-brand p { max-width: 100%; }
}

@media (max-width: 480px) {
    .hero h1 { font-size: 2rem; }
    .logo-text { font-size: 1.2rem; }
}