/* =========================================
   Mars Academy LMS - Landing Page Styles
   Professional Design - Mars Academy Colors
   ========================================= */

:root[data-theme="light"] {
    --bg-primary: #f8f9fc;
    --bg-secondary: #ffffff;
    --text-primary: #1a0a3e;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    --accent: #6c3ce0;
    --accent-hover: #5a2dcf;
    --accent-light: rgba(108, 60, 224, 0.06);
    --gradient-start: #8b5cf6;
    --gradient-end: #f97316;
    --border: #e2e8f0;
    --card-bg: #ffffff;
    --nav-solid: rgba(255, 255, 255, 0.95);
    --hero-bg: #1a0a3e;
    --footer-bg: #0f0824;
}

:root[data-theme="dark"] {
    --bg-primary: #0f0a1e;
    --bg-secondary: #1a1230;
    --text-primary: #e2e8f0;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --accent: #8b5cf6;
    --accent-hover: #7c3aed;
    --accent-light: rgba(139, 92, 246, 0.08);
    --gradient-start: #8b5cf6;
    --gradient-end: #f97316;
    --border: #2d2548;
    --card-bg: #1a1230;
    --nav-solid: rgba(15, 10, 30, 0.95);
    --hero-bg: #0a0618;
    --footer-bg: #050310;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    transition: background-color 0.3s ease, color 0.3s ease;
}

a { text-decoration: none; color: inherit; }
img { max-width: 100%; height: auto; }

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

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 28px;
    border-radius: 12px;
    font-size: 14px;
    font-weight: 600;
    font-family: inherit;
    border: none;
    cursor: pointer;
    transition: all 0.25s ease;
    white-space: nowrap;
}

.btn-primary {
    background: linear-gradient(135deg, var(--gradient-start), var(--accent));
    color: #fff;
    box-shadow: 0 4px 14px rgba(108, 60, 224, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(108, 60, 224, 0.4);
}

.btn-outline {
    background: transparent;
    color: #fff;
    border: 2px solid rgba(255, 255, 255, 0.25);
}

.btn-outline:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.5);
}

.btn-lg { padding: 14px 32px; font-size: 15px; }

/* =========================================
   Navigation
   ========================================= */
.main-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 16px 0;
    transition: all 0.3s ease;
}

.main-nav.scrolled {
    background: var(--nav-solid);
    backdrop-filter: blur(20px);
    padding: 10px 0;
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.08);
}

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

.nav-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 800;
    font-size: 18px;
    color: #fff;
}

.main-nav.scrolled .nav-brand { color: var(--text-primary); }

.nav-brand img {
    width: 36px;
    height: 36px;
    border-radius: 8px;
}

.nav-logo-icon {
    width: 36px;
    height: 36px;
    border-radius: 8px;
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-weight: 800;
    font-size: 13px;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 8px;
}

.nav-item {
    padding: 8px 16px;
    border-radius: 8px;
    font-size: 13.5px;
    font-weight: 500;
    color: rgba(255, 255, 255, 0.75);
    transition: all 0.2s ease;
}

.nav-item:hover, .nav-item.active {
    color: #fff;
    background: rgba(255, 255, 255, 0.1);
}

.main-nav.scrolled .nav-item { color: var(--text-secondary); }
.main-nav.scrolled .nav-item:hover,
.main-nav.scrolled .nav-item.active { color: var(--accent); background: var(--accent-light); }

.nav-cta {
    background: linear-gradient(135deg, var(--gradient-start), var(--accent)) !important;
    color: #fff !important;
    padding: 8px 20px;
}

.nav-cta:hover { transform: translateY(-1px); }

.nav-toggle {
    display: none;
    background: none;
    border: none;
    color: #fff;
    font-size: 20px;
    cursor: pointer;
}

.main-nav.scrolled .nav-toggle { color: var(--text-primary); }

/* =========================================
   Hero Section
   ========================================= */
.hero {
    background: var(--hero-bg);
    padding: 140px 0 80px;
    position: relative;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse at 20% 50%, rgba(139, 92, 246, 0.15), transparent 60%),
        radial-gradient(ellipse at 80% 20%, rgba(249, 115, 22, 0.1), transparent 50%),
        radial-gradient(ellipse at 60% 90%, rgba(108, 60, 224, 0.1), transparent 40%);
    animation: heroPulse 8s ease-in-out infinite alternate;
}

@keyframes heroPulse {
    0% { opacity: 0.7; }
    100% { opacity: 1; }
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero-badge {
    display: inline-block;
    padding: 6px 16px;
    border-radius: 20px;
    background: rgba(139, 92, 246, 0.15);
    color: #c4b5fd;
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 0.5px;
    margin-bottom: 20px;
}

.hero h1 {
    font-size: 52px;
    font-weight: 900;
    color: #fff;
    line-height: 1.1;
    letter-spacing: -1.5px;
    margin-bottom: 12px;
}

.hero-tagline {
    font-size: 20px;
    color: #c4b5fd;
    font-weight: 500;
    margin-bottom: 16px;
}

.hero-desc {
    color: #94a3b8;
    font-size: 15px;
    line-height: 1.7;
    margin-bottom: 32px;
    max-width: 480px;
}

.hero-buttons {
    display: flex;
    gap: 14px;
    flex-wrap: wrap;
}

.hero-image {
    position: relative;
}

.hero-image img {
    border-radius: 20px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    width: 100%;
    object-fit: cover;
    aspect-ratio: 6/5;
}

/* =========================================
   Stats Section
   ========================================= */
.stats-section {
    padding: 60px 0;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
}

.stats-container {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 32px;
    text-align: center;
}

.stat-box {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.stat-number {
    font-size: 48px;
    font-weight: 900;
    letter-spacing: -2px;
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
    display: inline;
}

.stat-suffix {
    font-size: 28px;
    font-weight: 800;
    color: var(--accent);
    margin-top: -8px;
}

.stat-text {
    font-size: 14px;
    color: var(--text-secondary);
    font-weight: 500;
    margin-top: 4px;
}

/* =========================================
   Section Headers
   ========================================= */
.section-header {
    text-align: center;
    margin-bottom: 48px;
}

.section-badge {
    display: inline-block;
    padding: 6px 16px;
    border-radius: 20px;
    background: var(--accent-light);
    color: var(--accent);
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.5px;
    margin-bottom: 14px;
    text-transform: uppercase;
}

.section-header h2 {
    font-size: 36px;
    font-weight: 800;
    letter-spacing: -1px;
    margin-bottom: 12px;
}

.section-header p {
    color: var(--text-secondary);
    font-size: 16px;
    max-width: 540px;
    margin: 0 auto;
}

/* =========================================
   Features
   ========================================= */
.features-section {
    padding: 80px 0;
    background: var(--bg-primary);
}

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

.feature-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 32px;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.08);
}

.feature-icon {
    width: 52px;
    height: 52px;
    border-radius: 14px;
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    color: #fff;
    margin-bottom: 18px;
}

.feature-card h3 {
    font-size: 17px;
    font-weight: 700;
    margin-bottom: 8px;
    letter-spacing: -0.3px;
}

.feature-card p {
    color: var(--text-secondary);
    font-size: 13.5px;
    line-height: 1.6;
}

/* =========================================
   Courses / Boards
   ========================================= */
.courses-section {
    padding: 80px 0;
    background: var(--bg-secondary);
}

.boards-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 28px;
}

.board-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 16px;
    overflow: hidden;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.board-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.08);
}

.board-card img {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

.board-content {
    padding: 24px;
}

.board-content h3 {
    font-size: 20px;
    font-weight: 800;
    margin-bottom: 4px;
}

.board-content p {
    color: var(--text-secondary);
    font-size: 14px;
    margin-bottom: 14px;
}

.board-subjects {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.board-subjects span {
    padding: 4px 12px;
    border-radius: 6px;
    background: var(--accent-light);
    color: var(--accent);
    font-size: 11.5px;
    font-weight: 600;
}

/* =========================================
   CTA Section
   ========================================= */
.cta-section {
    padding: 80px 0;
    background: var(--hero-bg);
    text-align: center;
    position: relative;
    overflow: hidden;
}

.cta-section::before {
    content: '';
    position: absolute;
    inset: 0;
    background:
        radial-gradient(circle at 30% 50%, rgba(139, 92, 246, 0.2), transparent 50%),
        radial-gradient(circle at 70% 50%, rgba(249, 115, 22, 0.1), transparent 50%);
}

.cta-content {
    position: relative;
    z-index: 1;
}

.cta-content h2 {
    font-size: 36px;
    font-weight: 800;
    color: #fff;
    margin-bottom: 12px;
    letter-spacing: -1px;
}

.cta-content p {
    color: #c4b5fd;
    font-size: 16px;
    margin-bottom: 28px;
    max-width: 520px;
    margin-left: auto;
    margin-right: auto;
}

.cta-content .hero-buttons { justify-content: center; }

/* =========================================
   Footer
   ========================================= */
.main-footer {
    background: var(--footer-bg);
    color: #94a3b8;
    padding: 60px 0 0;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1.5fr;
    gap: 40px;
}

.footer-brand h3 {
    color: #fff;
    font-size: 20px;
    font-weight: 800;
    margin-top: 12px;
    margin-bottom: 8px;
}

.footer-brand p { font-size: 13.5px; }

.footer-social {
    display: flex;
    gap: 10px;
    margin-top: 16px;
}

.footer-social a {
    width: 36px;
    height: 36px;
    border-radius: 10px;
    background: rgba(255, 255, 255, 0.06);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #94a3b8;
    font-size: 14px;
    transition: all 0.2s ease;
}

.footer-social a:hover {
    background: var(--accent);
    color: #fff;
}

.footer-links h4, .footer-contact h4 {
    color: #fff;
    font-size: 14px;
    font-weight: 700;
    margin-bottom: 16px;
}

.footer-links a {
    display: block;
    font-size: 13.5px;
    padding: 4px 0;
    transition: color 0.2s;
}

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

.footer-contact p {
    font-size: 13px;
    margin-bottom: 10px;
    display: flex;
    align-items: flex-start;
    gap: 10px;
}

.footer-contact i {
    color: var(--accent);
    margin-top: 4px;
}

.footer-bottom {
    margin-top: 40px;
    padding: 18px 0;
    border-top: 1px solid rgba(255, 255, 255, 0.06);
    text-align: center;
    font-size: 12.5px;
}

/* =========================================
   Theme FAB
   ========================================= */
.theme-fab {
    position: fixed;
    bottom: 24px;
    right: 24px;
    width: 48px;
    height: 48px;
    border-radius: 14px;
    background: var(--card-bg);
    border: 1px solid var(--border);
    color: var(--text-primary);
    font-size: 18px;
    cursor: pointer;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.12);
    z-index: 999;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
}

.theme-fab:hover {
    transform: scale(1.1);
    box-shadow: 0 6px 28px rgba(0, 0, 0, 0.18);
}

/* =========================================
   Animations
   ========================================= */
[data-animate] {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

[data-animate="fade-left"] {
    transform: translateX(40px);
}

[data-animate].visible {
    opacity: 1;
    transform: translate(0, 0);
}

/* =========================================
   Responsive
   ========================================= */
@media (max-width: 1024px) {
    .hero-content { grid-template-columns: 1fr; gap: 40px; }
    .hero h1 { font-size: 40px; }
    .hero-image { max-width: 500px; margin: 0 auto; }
    .features-grid { grid-template-columns: repeat(2, 1fr); }
    .footer-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--nav-solid);
        flex-direction: column;
        padding: 16px;
        border-bottom: 1px solid var(--border);
        box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    }
    .nav-links.open { display: flex; }
    .nav-toggle { display: block; }
    .nav-item { width: 100%; color: var(--text-primary); }
    .hero { padding: 120px 0 60px; }
    .hero h1 { font-size: 32px; }
    .hero-tagline { font-size: 16px; }
    .hero-desc { font-size: 14px; }
    .stats-container { grid-template-columns: repeat(2, 1fr); gap: 24px; }
    .stat-number { font-size: 36px; }
    .features-grid { grid-template-columns: 1fr; }
    .boards-grid { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: 1fr; }
    .section-header h2 { font-size: 28px; }
    .cta-content h2 { font-size: 28px; }
}

@media (max-width: 480px) {
    .hero h1 { font-size: 28px; }
    .hero-buttons { flex-direction: column; }
    .btn-lg { width: 100%; justify-content: center; }
}