/* ==========================================================================
   CSS Variables & Design System
   ========================================================================== */
   :root {
    /* Colors */
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --primary-light: #eff6ff;
    
    --accent-color: #f97316;
    --accent-hover: #ea580c;
    
    --bg-main: #f8fafc;
    --bg-surface: #ffffff;
    
    --text-main: #0f172a;
    --text-muted: #64748b;
    --slate-200: #e2e8f0;
    --slate-300: #cbd5e1;
    
    /* Typography */
    --font-family: 'Inter', system-ui, -apple-system, sans-serif;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-hover: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    
    /* Radii */
    --radius-md: 12px;
    --radius-lg: 18px;
    --radius-full: 9999px;
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
}

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

a {
    text-decoration: none;
    color: inherit;
}

ul {
    list-style: none;
}

/* Typography Utilities */
h1, h2, h3, h4 {
    font-weight: 700;
    line-height: 1.2;
    color: var(--text-main);
}

p {
    color: var(--text-muted);
}

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

.bg-white {
    background-color: var(--bg-surface);
}

/* ==========================================================================
   Layout & Grid System
   ========================================================================== */
.container {
    width: 100%;
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 24px;
}

.section {
    padding: 80px 0;
}

.section-header {
    text-align: center;
    max-width: 600px;
    margin: 0 auto 48px;
}

.section-header h2 {
    font-size: 2.5rem;
    margin-bottom: 16px;
}

.grid {
    display: grid;
    gap: 32px;
}

.grid-3 { grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); }
.grid-5 { grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); }

/* ==========================================================================
   Components (Buttons, Cards, Badges)
   ========================================================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 20px;
    border-radius: var(--radius-full);
    font-weight: 500;
    transition: var(--transition-normal);
    cursor: pointer;
    border: none;
    font-size: 1rem;
}

.btn-lg {
    padding: 14px 28px;
    font-size: 1.1rem;
}

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

.btn-primary:hover {
    background-color: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background-color: white;
    color: var(--text-main);
    box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
    background-color: var(--bg-main);
    transform: translateY(-2px);
}

.btn-outline {
    background-color: transparent;
    border: 1px solid var(--slate-300);
}

.btn-outline:hover {
    border-color: var(--text-main);
}

.btn-text {
    color: var(--primary-color);
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

.btn-text:hover {
    gap: 8px; /* Slight move right animation */
}

.icon-btn {
    background: none;
    border: none;
    font-size: 1.25rem;
    color: var(--text-main);
    cursor: pointer;
    padding: 8px;
    border-radius: 50%;
    transition: var(--transition-fast);
}

.icon-btn:hover {
    background-color: var(--slate-200);
}

.badge {
    display: inline-block;
    padding: 6px 12px;
    background-color: var(--primary-light);
    color: var(--primary-color);
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 16px;
}

.card {
    background: var(--bg-surface);
    border-radius: var(--radius-lg);
    padding: 32px;
    box-shadow: var(--shadow-md);
    transition: var(--transition-normal);
    border: 1px solid var(--slate-200);
}

.card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-hover);
    border-color: var(--primary-light);
}

/* ==========================================================================
   Navbar
   ========================================================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    z-index: 1000;
    transition: var(--transition-normal);
    border-bottom: 1px solid transparent;
}

.navbar.scrolled {
    padding: 8px 0;
    border-bottom-color: var(--slate-200);
    box-shadow: var(--shadow-sm);
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 80px;
    transition: height var(--transition-normal);
}

.navbar.scrolled .nav-container {
    height: 64px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-main);
}

.logo i {
    font-size: 1.75rem;
}

.nav-links {
    display: flex;
    gap: 32px;
}

.nav-links a {
    font-weight: 500;
    color: var(--text-muted);
    transition: var(--transition-fast);
}

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

.nav-actions {
    display: flex;
    align-items: center;
    gap: 16px;
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
}

/* ==========================================================================
   Hero Section
   ========================================================================== */
.hero {
    position: relative;
    padding: 160px 0 80px;
    overflow: hidden;
}

.hero-bg-shapes {
    position: absolute;
    top: -10%;
    right: -5%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, var(--primary-light) 0%, transparent 70%);
    z-index: -1;
    border-radius: 50%;
}

.hero-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    align-items: center;
}

.hero-content h1 {
    font-size: 4rem;
    margin-bottom: 24px;
    letter-spacing: -0.02em;
}

.hero-content p {
    font-size: 1.25rem;
    margin-bottom: 32px;
    max-width: 90%;
}

.hero-buttons {
    display: flex;
    gap: 16px;
}

.floating-svg {
    width: 100%;
    height: auto;
    animation: float 6s ease-in-out infinite;
}

/* ==========================================================================
   Stats Section
   ========================================================================== */
.stats-section {
    padding: 48px 0;
    border-top: 1px solid var(--slate-200);
    border-bottom: 1px solid var(--slate-200);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    text-align: center;
    gap: 24px;
}

.stat-card h3 {
    display: inline-block;
    font-size: 2.5rem;
    color: var(--primary-color);
}

.stat-card .plus {
    font-size: 2.5rem;
    color: var(--primary-color);
    font-weight: 700;
}

.stat-card p {
    font-size: 1rem;
    font-weight: 500;
    margin-top: 8px;
}

/* ==========================================================================
   Classes & Boards
   ========================================================================== */
.class-card {
    text-align: center;
}

.icon-wrapper {
    width: 64px;
    height: 64px;
    background: var(--primary-light);
    color: var(--primary-color);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    margin: 0 auto 24px;
    transition: var(--transition-normal);
}

.class-card:hover .icon-wrapper {
    background: var(--primary-color);
    color: white;
}

.class-card h3 {
    margin-bottom: 12px;
}

.class-card p {
    margin-bottom: 24px;
    font-size: 0.95rem;
}

.feature-list {
    margin-top: 24px;
}

.feature-list li {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 12px;
    color: var(--text-main);
    font-weight: 500;
}

.feature-list i {
    color: var(--primary-color);
    font-size: 1.2rem;
}

/* ==========================================================================
   Timeline Section
   ========================================================================== */
.timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
}

.timeline::before {
    content: '';
    position: absolute;
    top: 0;
    left: 32px;
    height: 100%;
    width: 2px;
    background: var(--slate-200);
}

.timeline-item {
    display: flex;
    gap: 32px;
    margin-bottom: 40px;
    position: relative;
}

.timeline-icon {
    width: 64px;
    height: 64px;
    background: white;
    border: 2px solid var(--primary-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: var(--primary-color);
    z-index: 1;
    flex-shrink: 0;
}

.timeline-content {
    background: white;
    padding: 24px;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    flex-grow: 1;
    border: 1px solid var(--slate-200);
}

.timeline-content h3 { margin-bottom: 8px; }

/* ==========================================================================
   FAQ Section
   ========================================================================== */
.faq-container {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    border: 1px solid var(--slate-200);
    border-radius: var(--radius-md);
    margin-bottom: 16px;
    overflow: hidden;
}

.faq-question {
    width: 100%;
    padding: 20px 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: white;
    border: none;
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-main);
    cursor: pointer;
    text-align: left;
}

.faq-question i {
    transition: transform var(--transition-fast);
}

.faq-item.active .faq-question i {
    transform: rotate(180deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    background: white;
    transition: max-height 0.4s ease;
}

.faq-answer p {
    padding: 0 24px 24px;
}

/* ==========================================================================
   Newsletter & Footer
   ========================================================================== */
.newsletter-card {
    background: var(--primary-color);
    border-radius: var(--radius-lg);
    padding: 64px 32px;
    text-align: center;
    color: white;
    background-image: radial-gradient(circle at top right, var(--primary-hover) 0%, transparent 60%);
}

.newsletter-card h2 { color: white; margin-bottom: 16px; }
.newsletter-card p { color: var(--primary-light); margin-bottom: 32px; font-size: 1.1rem; }

.newsletter-form {
    display: flex;
    max-width: 500px;
    margin: 0 auto;
    gap: 8px;
}

.newsletter-form input {
    flex-grow: 1;
    padding: 14px 24px;
    border-radius: var(--radius-full);
    border: none;
    font-size: 1rem;
    outline: none;
}

.newsletter-form .btn {
    background: var(--accent-color);
}
.newsletter-form .btn:hover { background: var(--accent-hover); }

.footer {
    background: white;
    padding: 80px 0 24px;
    border-top: 1px solid var(--slate-200);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 48px;
    margin-bottom: 64px;
}

.footer-brand p {
    margin: 16px 0 24px;
}

.social-links {
    display: flex;
    gap: 16px;
}

.social-links a {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--slate-200);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-main);
    transition: var(--transition-fast);
}

.social-links a:hover {
    background: var(--primary-color);
    color: white;
}

.footer-links h4 { margin-bottom: 24px; }
.footer-links a {
    display: block;
    color: var(--text-muted);
    margin-bottom: 12px;
    transition: var(--transition-fast);
}
.footer-links a:hover { color: var(--primary-color); }

.footer-bottom {
    text-align: center;
    padding-top: 24px;
    border-top: 1px solid var(--slate-200);
}

/* ==========================================================================
   Animations & Media Queries
   ========================================================================== */
@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-20px); }
}

.reveal-up {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.8s cubic-bezier(0.5, 0, 0, 1);
}

.reveal-up.active {
    opacity: 1;
    transform: translateY(0);
}

/* Mobile Responsive */
@media (max-width: 992px) {
    .hero-container {
        grid-template-columns: 1fr;
        text-align: center;
    }
    .hero-content h1 { font-size: 3rem; }
    .hero-content p { margin: 0 auto 32px; }
    .hero-buttons { justify-content: center; }
    .hero-image { max-width: 80%; margin: 0 auto; }
    
    .stats-grid { grid-template-columns: repeat(2, 1fr); }
    .footer-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
    .nav-links, .nav-actions .btn { display: none; }
    .mobile-menu-btn { display: block; }
    
    .timeline::before { left: 24px; }
    .timeline-icon { width: 48px; height: 48px; font-size: 1.2rem; }
    .timeline-item { gap: 16px; }
    
    .newsletter-form { flex-direction: column; }
    .newsletter-form .btn { width: 100%; }
    
    .footer-grid { grid-template-columns: 1fr; }
}