:root {
    --bg-primary: #04040a;
    --text-primary: #ffffff;
    --text-secondary: #94a3b8;
    --accent-blue: #3b82f6;
    --accent-purple: #8b5cf6;
    --accent-pink: #ec4899;
    --glass-bg: rgba(255, 255, 255, 0.02);
    --glass-border: rgba(255, 255, 255, 0.08);
    --math-color: #3b82f6;
    --physics-color: #8b5cf6;
    --chem-color: #10b981;
}

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

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

/* Background Animations */
.background-animation {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: -1;
    overflow: hidden;
    background: radial-gradient(circle at center, #0a0a1a 0%, #020205 100%);
}

.blob {
    position: absolute;
    border-radius: 50%;
    filter: blur(90px);
    opacity: 0.4;
    animation: float 20s infinite alternate cubic-bezier(0.4, 0, 0.2, 1);
}

.blob-1 {
    width: 500px;
    height: 500px;
    background: var(--accent-blue);
    top: -100px;
    left: -100px;
    animation-delay: 0s;
}

.blob-2 {
    width: 400px;
    height: 400px;
    background: var(--accent-purple);
    bottom: -100px;
    right: -100px;
    animation-delay: -5s;
}

.blob-3 {
    width: 600px;
    height: 600px;
    background: var(--accent-pink);
    top: 40%;
    left: 40%;
    transform: translate(-50%, -50%);
    opacity: 0.15;
    animation-delay: -10s;
}

@keyframes float {
    0% { transform: translate(0, 0) scale(1); }
    33% { transform: translate(40px, -60px) scale(1.1); }
    66% { transform: translate(-30px, 30px) scale(0.9); }
    100% { transform: translate(0, 0) scale(1); }
}

/* Glassmorphism Classes */
.glass-header {
    position: fixed;
    top: 0;
    width: 100%;
    padding: 1.2rem 5%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: rgba(4, 4, 10, 0.6);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    border-bottom: 1px solid var(--glass-border);
    z-index: 1000;
}

.glass-card {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: 24px;
    box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.3);
}

/* Header */
.logo {
    font-family: 'Outfit', sans-serif;
    font-size: 1.6rem;
    font-weight: 900;
    display: flex;
    align-items: center;
    gap: 0.8rem;
    letter-spacing: -0.5px;
}

.logo span {
    background: linear-gradient(135deg, var(--accent-blue), var(--accent-pink));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

nav {
    display: flex;
    gap: 2.5rem;
}

nav a {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    font-size: 1.05rem;
    transition: color 0.3s ease;
    position: relative;
    padding-bottom: 5px;
}

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

nav a::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: 0;
    left: 0;
    background: linear-gradient(90deg, var(--accent-blue), var(--accent-purple));
    transition: width 0.3s ease;
    border-radius: 2px;
}

nav a:hover::after {
    width: 100%;
}

/* Main Content */
main {
    padding-top: 140px;
    max-width: 1200px;
    margin: 0 auto;
    padding-left: 5%;
    padding-right: 5%;
}

/* Hero Section */
#hero {
    text-align: center;
    padding: 2rem 0 5rem 0;
}

.glitch-text {
    font-family: 'Outfit', sans-serif;
    font-size: 5rem;
    font-weight: 900;
    letter-spacing: -1px;
    margin-bottom: 1.5rem;
    background: linear-gradient(135deg, #ffffff 0%, #a5b4fc 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    filter: drop-shadow(0 0 40px rgba(59, 130, 246, 0.4));
}

.subtitle {
    font-size: 1.3rem;
    color: var(--text-secondary);
    margin-bottom: 4rem;
    font-weight: 300;
}

/* Countdown */
.countdown-container {
    padding: 3.5rem;
    max-width: 850px;
    margin: 0 auto;
    position: relative;
    overflow: hidden;
}

.countdown-container::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0; height: 2px;
    background: linear-gradient(90deg, transparent, var(--accent-blue), transparent);
    opacity: 0.5;
}

.countdown-container h2 {
    font-family: 'Outfit', sans-serif;
    font-weight: 600;
    font-size: 1.4rem;
    margin-bottom: 2.5rem;
    color: #e2e8f0;
    letter-spacing: 0.5px;
}

.timer {
    display: flex;
    justify-content: center;
    gap: 3rem;
}

.time-box {
    display: flex;
    flex-direction: column;
    align-items: center;
    min-width: 100px;
}

.time-box span {
    font-family: 'Outfit', sans-serif;
    font-size: 4.5rem;
    font-weight: 700;
    line-height: 1;
    background: linear-gradient(180deg, #ffffff 0%, #94a3b8 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    filter: drop-shadow(0 0 15px rgba(255,255,255,0.15));
}

.time-box p {
    font-size: 0.95rem;
    color: var(--accent-purple);
    text-transform: uppercase;
    letter-spacing: 3px;
    margin-top: 1rem;
    font-weight: 600;
}

/* Section Styling */
.section-title {
    font-family: 'Outfit', sans-serif;
    font-size: 2.8rem;
    font-weight: 800;
    text-align: center;
    margin-bottom: 4rem;
    background: linear-gradient(135deg, #fff, #94a3b8);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

/* Schedule Section */
.schedule-section {
    margin: 8rem 0;
}

.schedule-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2.5rem;
}

.schedule-card {
    padding: 3rem 2.5rem;
    position: relative;
    transition: transform 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275), box-shadow 0.4s ease;
}

.schedule-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 40px 0 rgba(139, 92, 246, 0.15);
    border-color: rgba(255,255,255,0.15);
}

.date-badge {
    position: absolute;
    top: -18px;
    left: 2.5rem;
    background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
    padding: 0.6rem 1.8rem;
    border-radius: 20px;
    font-weight: 700;
    font-family: 'Outfit', sans-serif;
    font-size: 1.1rem;
    box-shadow: 0 4px 20px rgba(59, 130, 246, 0.4);
}

.schedule-card h3 {
    margin-top: 0.5rem;
    margin-bottom: 2rem;
    color: #f8fafc;
    font-size: 1.6rem;
    font-family: 'Outfit', sans-serif;
}

.schedule-list {
    list-style: none;
}

.schedule-list li {
    margin-bottom: 1.2rem;
    display: flex;
    align-items: center;
    gap: 1.2rem;
    color: #e2e8f0;
    font-size: 1.05rem;
}

.schedule-list i {
    color: var(--accent-pink);
    font-size: 1.2rem;
    width: 24px;
    text-align: center;
}

.schedule-list .note {
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-style: italic;
    margin-top: 1rem;
    line-height: 1.5;
}

/* Subjects Section */
.subjects-section {
    margin: 8rem 0;
}

.subjects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
    gap: 2.5rem;
}

.subject-card {
    padding: 3rem;
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    position: relative;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.subject-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: var(--card-color);
    opacity: 0.8;
}

.math-theme { --card-color: var(--math-color); }
.physics-theme { --card-color: var(--physics-color); }
.chem-theme { --card-color: var(--chem-color); }

.subject-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px -10px rgba(0,0,0,0.4), 0 0 25px rgba(var(--card-color), 0.2);
    border-color: rgba(255,255,255,0.15);
}

.icon-wrapper {
    width: 65px;
    height: 65px;
    border-radius: 18px;
    background: linear-gradient(135deg, rgba(255,255,255,0.1), rgba(255,255,255,0.02));
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 2rem;
    color: var(--card-color);
    margin-bottom: 2rem;
    border: 1px solid rgba(255,255,255,0.1);
    box-shadow: 0 8px 16px rgba(0,0,0,0.2);
}

.subject-card h3 {
    font-family: 'Outfit', sans-serif;
    font-size: 2rem;
    margin-bottom: 1.2rem;
    font-weight: 700;
}

.subject-card p {
    color: var(--text-secondary);
    margin-bottom: 2rem;
    flex-grow: 1;
    font-size: 1.05rem;
}

.topics {
    display: flex;
    flex-wrap: wrap;
    gap: 0.6rem;
    margin-bottom: 2.5rem;
}

.topic-tag {
    background: rgba(255,255,255,0.03);
    padding: 0.5rem 1rem;
    border-radius: 10px;
    font-size: 0.9rem;
    border: 1px solid rgba(255,255,255,0.1);
    transition: all 0.3s ease;
    color: #e2e8f0;
}

.topic-tag:hover {
    background: var(--card-color);
    color: #fff;
    border-color: var(--card-color);
}

.btn-explore {
    background: transparent;
    border: 1px solid var(--card-color);
    color: var(--text-primary);
    padding: 1rem;
    border-radius: 14px;
    font-family: 'Inter', sans-serif;
    font-size: 1.05rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 0.8rem;
}

.btn-explore:hover {
    background: var(--card-color);
    color: #fff;
    box-shadow: 0 8px 20px rgba(0,0,0,0.3);
}

/* Quote Section */
.knowledge-base-section {
    margin: 8rem 0;
}

.quote-card {
    padding: 5rem 3rem;
    text-align: center;
    max-width: 900px;
    margin: 0 auto;
}

.quote-card i {
    font-size: 3.5rem;
    background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 2rem;
}

.quote-card blockquote {
    font-family: 'Outfit', sans-serif;
    font-size: 1.8rem;
    font-style: italic;
    margin-bottom: 2rem;
    line-height: 1.6;
    color: #f8fafc;
}

.quote-card p {
    color: var(--accent-pink);
    font-weight: 600;
    font-size: 1.2rem;
    letter-spacing: 0.5px;
}

/* Footer */
footer {
    text-align: center;
    padding: 4rem 0;
    border-top: 1px solid var(--glass-border);
    color: var(--text-secondary);
    margin-top: 6rem;
    background: rgba(4, 4, 10, 0.8);
    backdrop-filter: blur(10px);
}

/* Modal Styling */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(4, 4, 10, 0.7);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    z-index: 2000;
    display: flex;
    justify-content: center;
    align-items: center;
    opacity: 0;
    visibility: hidden;
    transition: all 0.4s ease;
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.modal-content {
    width: 90%;
    max-width: 850px;
    max-height: 85vh;
    overflow-y: auto;
    position: relative;
    padding: 3.5rem;
    transform: translateY(30px) scale(0.95);
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.modal-overlay.active .modal-content {
    transform: translateY(0) scale(1);
}

.modal-content::-webkit-scrollbar {
    width: 8px;
}
.modal-content::-webkit-scrollbar-track {
    background: rgba(255,255,255,0.05);
    border-radius: 4px;
}
.modal-content::-webkit-scrollbar-thumb {
    background: var(--card-color);
    border-radius: 4px;
}

.close-modal {
    position: absolute;
    top: 1.5rem;
    right: 1.5rem;
    background: rgba(255, 255, 255, 0.1);
    border: none;
    color: #fff;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    font-size: 1.2rem;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 10;
}

.close-modal:hover {
    background: #ef4444;
    transform: rotate(90deg);
}

.modal-header {
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    padding-bottom: 1.5rem;
    margin-bottom: 2.5rem;
}

.modal-header h2 {
    font-family: 'Outfit', sans-serif;
    font-size: 2.5rem;
    color: var(--card-color);
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 0.5rem;
}

.modal-header p {
    color: var(--text-secondary);
    font-size: 1.15rem;
}

.modal-body {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.knowledge-block {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: 16px;
    padding: 2.5rem;
    transition: transform 0.3s ease, border-color 0.3s ease;
}

.knowledge-block:hover {
    transform: translateX(5px);
    border-color: rgba(255, 255, 255, 0.15);
}

.knowledge-block h3 {
    font-family: 'Outfit', sans-serif;
    color: #f8fafc;
    font-size: 1.5rem;
    margin-bottom: 1.2rem;
    border-left: 4px solid var(--card-color);
    padding-left: 1rem;
}

.knowledge-block p {
    color: #cbd5e1;
    margin-bottom: 1.5rem;
    line-height: 1.7;
    font-size: 1.05rem;
}

.knowledge-block strong {
    color: var(--card-color);
}

.knowledge-block ul {
    list-style: none;
}

.knowledge-block li {
    margin-bottom: 1rem;
    color: #94a3b8;
    display: flex;
    align-items: flex-start;
    gap: 0.8rem;
    line-height: 1.7;
}

.knowledge-block li i {
    color: var(--card-color);
    margin-top: 6px;
    font-size: 0.9rem;
}

/* MathJax custom color */
.MathJax {
    color: #e2e8f0 !important;
}

/* Responsive */
@media (max-width: 992px) {
    .glitch-text { font-size: 3.5rem; }
    .timer { gap: 1.5rem; }
    .time-box span { font-size: 3.5rem; }
}

@media (max-width: 768px) {
    .glass-header { flex-direction: column; gap: 1.5rem; padding: 1.2rem; }
    nav { gap: 1.5rem; flex-wrap: wrap; justify-content: center; }
    
    main { padding-top: 180px; }
    
    .countdown-container { padding: 2.5rem 1.5rem; }
    .timer { flex-wrap: wrap; justify-content: space-around; gap: 2rem; }
    .time-box { min-width: 40%; }
    
    .schedule-grid, .subjects-grid { grid-template-columns: 1fr; }
    
    .quote-card { padding: 3rem 1.5rem; }
    .quote-card blockquote { font-size: 1.3rem; }
}

@media (max-width: 480px) {
    .glitch-text { font-size: 2.5rem; }
    .time-box span { font-size: 2.8rem; }
    .time-box p { font-size: 0.8rem; }
}