* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
:root {
    --bg-gradient-start: #0b0f2a;
    --bg-gradient-mid: #1a1f3a;
    --bg-gradient-end: #0a0f1f;
    --glass-bg: rgba(255, 255, 255, 0.08);
    --glass-border: rgba(255, 255, 255, 0.25);
    --text-primary: white;
    --text-secondary: #cbd5e1;
    --card-bg: rgba(10, 15, 30, 0.45);
    --input-bg: rgba(255, 255, 255, 0.1);
    --btn-glass: rgba(255, 255, 255, 0.2);
    --btn-hover: rgba(56, 189, 248, 0.5);
    --active-bg: rgba(56, 189, 248, 0.25);
}
body.light {
    --bg-gradient-start: #e0f2fe;
    --bg-gradient-mid: #f0f9ff;
    --bg-gradient-end: #d9eafb;
    --glass-bg: rgba(255, 255, 255, 0.75);
    --glass-border: rgba(0, 0, 0, 0.15);
    --text-primary: #0f172a;
    --text-secondary: #1e293b;
    --card-bg: rgba(255, 255, 255, 0.6);
    --input-bg: rgba(0, 0, 0, 0.05);
    --btn-glass: rgba(0, 0, 0, 0.08);
    --btn-hover: rgba(56, 189, 248, 0.7);
    --active-bg: rgba(0, 0, 0, 0.1);
}
body.dark {
    --bg-gradient-start: #0b0f2a;
    --bg-gradient-mid: #1a1f3a;
    --bg-gradient-end: #0a0f1f;
    --glass-bg: rgba(255, 255, 255, 0.08);
    --glass-border: rgba(255, 255, 255, 0.25);
    --text-primary: white;
    --text-secondary: #cbd5e1;
    --card-bg: rgba(10, 15, 30, 0.45);
    --input-bg: rgba(255, 255, 255, 0.1);
    --btn-glass: rgba(255, 255, 255, 0.2);
    --active-bg: rgba(56, 189, 248, 0.25);
}
body {
    font-family: 'Segoe UI', 'Poppins', sans-serif;
    background: linear-gradient(135deg, var(--bg-gradient-start) 0%, var(--bg-gradient-mid) 40%, var(--bg-gradient-end) 100%);
    min-height: 100vh;
    color: var(--text-primary);
    transition: all 0.3s ease;
    margin: 0;
    padding: 2rem 1.5rem;
}
/* Animated orbs */
.orb {
    position: fixed;
    border-radius: 50%;
    filter: blur(100px);
    opacity: 0.4;
    animation: float 18s infinite alternate;
    pointer-events: none;
    z-index: 0;
}
.orb-1 { width: 60vw; height: 60vw; background: radial-gradient(circle, #6d28d9, #4f46e5); top: -20%; left: -10%; animation-duration: 20s; }
.orb-2 { width: 50vw; height: 50vw; background: radial-gradient(circle, #0ea5e9, #3b82f6); bottom: -15%; right: -5%; animation-duration: 25s; }
.orb-3 { width: 40vw; height: 40vw; background: radial-gradient(circle, #a855f7, #8b5cf6); top: 50%; left: 40%; animation-duration: 22s; }
@keyframes float {
    0% { transform: translate(0,0) scale(1); }
    100% { transform: translate(30px, -20px) scale(1.05); }
}
.glass-home {
    position: relative;
    z-index: 10;
    max-width: 1400px;
    margin: 0 auto;
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    border-radius: 3rem;
    border: 1px solid var(--glass-border);
    padding: 2rem;
    box-shadow: 0 30px 60px rgba(0,0,0,0.3);
}
.logo h1 {
    font-size: 2.5rem;
    background: linear-gradient(135deg, #38bdf8, #818cf8, #c084fc);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    display: inline-flex;
    align-items: center;
    gap: 0.8rem;
}
body.light .logo h1 {
    background: linear-gradient(135deg, #0284c7, #4f46e5, #7e22ce);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}
.class-btn, .tab {
    background: rgba(255,255,255,0.05);
    border: 1px solid var(--glass-border);
    border-radius: 3rem;
    padding: 0.8rem 2rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    color: var(--text-secondary);
}
.class-btn.active, .tab.active {
    background: var(--active-bg);
    border-color: #38bdf8;
    color: var(--text-primary);
    box-shadow: 0 0 20px #38bdf8;
}
.search-container {
    display: flex;
    justify-content: center;
    margin: 1rem 0;
}
.search-box {
    background: var(--input-bg);
    border: 1px solid var(--glass-border);
    border-radius: 3rem;
    padding: 0.7rem 1.5rem 0.7rem 45px;
    width: 100%;
    max-width: 450px;
    color: var(--text-primary);
    font-size: 1rem;
    outline: none;
    transition: 0.2s;
}
.search-box:focus {
    border-color: #38bdf8;
    box-shadow: 0 0 15px #38bdf8;
}
.search-icon {
    position: absolute;
    left: 18px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-secondary);
}
.clear-search {
    position: absolute;
    right: 18px;
    top: 50%;
    transform: translateY(-50%);
    cursor: pointer;
    color: var(--text-secondary);
}
.card-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 1.5rem;
    justify-content: center;
    margin-top: 1.5rem;
}
.info-card {
    background: var(--card-bg);
    border-radius: 2rem;
    padding: 1.5rem;
    flex: 1 1 280px;
    border: 1px solid var(--glass-border);
    transition: transform 0.2s;
}
.info-card:hover { transform: translateY(-5px); }
.video-embed {
    position: relative;
    padding-bottom: 56.25%;
    margin-top: 1rem;
    border-radius: 1rem;
    overflow: hidden;
}
.video-embed iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border-radius: 1rem;
}
.btn-glass {
    background: var(--btn-glass);
    border: 1px solid var(--glass-border);
    padding: 0.7rem 1.8rem;
    border-radius: 3rem;
    color: var(--text-primary);
    font-weight: 600;
    cursor: pointer;
    transition: 0.2s;
    margin-top: 1rem;
}
.btn-glass:hover {
    background: var(--btn-hover);
    box-shadow: 0 0 20px #38bdf8;
}
.footer-links {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 2rem;
    margin-top: 3rem;
    padding-top: 1rem;
    border-top: 1px solid var(--glass-border);
}
.footer-link {
    cursor: pointer;
    padding: 0.5rem 1.2rem;
    border-radius: 2rem;
    background: rgba(255,255,255,0.05);
    transition: 0.2s;
}
.footer-link:hover {
    background: rgba(56,189,248,0.2);
    color: #7dd3fc;
}
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.7);
    backdrop-filter: blur(8px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}
.modal-content {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    border-radius: 2rem;
    max-width: 500px;
    width: 90%;
    padding: 2rem;
    border: 1px solid var(--glass-border);
}
.glass-input, .glass-textarea {
    background: var(--input-bg);
    border: 1px solid var(--glass-border);
    border-radius: 1.5rem;
    padding: 0.8rem;
    width: 100%;
    margin: 0.8rem 0;
    color: var(--text-primary);
}
@media (max-width: 768px) {
    body { padding: 1rem; }
    .glass-home { padding: 1.2rem; }
    .logo h1 { font-size: 1.8rem; }
}