:root {
    --bg-color: #0d0d0f;
    --bg-darker: #080809;
    --surface-color: #1a1a1d;
    --surface-light: #2d2d33;
    --text-primary: #f3f4f6;
    --text-secondary: #9ca3af;
    --accent-yellow: #facc15;
    --accent-yellow-glow: rgba(250, 204, 21, 0.3);
    --accent-red: #ef4444;
    --accent-red-glow: rgba(239, 68, 68, 0.3);
    --font-heading: 'Oswald', sans-serif;
    --font-body: 'Inter', sans-serif;
    --transition: all 0.3s ease;
}

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

html {
    scroll-behavior: smooth;
}

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

a {
    text-decoration: none;
    color: inherit;
    transition: var(--transition);
}

ul {
    list-style: none;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Utilities */
.text-yellow { color: var(--accent-yellow); }
.text-red { color: var(--accent-red); }
.bg-yellow { background-color: var(--accent-yellow); color: #000; }
.bg-red { background-color: var(--accent-red); color: #fff; }
.bg-darker { background-color: var(--bg-darker); }
.text-center { text-align: center; }

/* Buttons */
.btn {
    display: inline-block;
    padding: 14px 32px;
    font-family: var(--font-heading);
    font-size: 1.1rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    border-radius: 4px;
    cursor: pointer;
    transition: var(--transition);
    border: none;
}

.btn-primary {
    background-color: var(--accent-yellow);
    color: #000;
    box-shadow: 0 4px 15px var(--accent-yellow-glow);
}

.btn-primary:hover {
    background-color: #eab308;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px var(--accent-yellow-glow);
}

.btn-outline {
    background-color: transparent;
    color: var(--text-primary);
    border: 2px solid var(--accent-red);
}

.btn-outline:hover {
    background-color: var(--accent-red);
    box-shadow: 0 4px 15px var(--accent-red-glow);
    transform: translateY(-2px);
}

/* Navbar */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    padding: 20px 0;
    transition: var(--transition);
    background: rgba(13, 13, 15, 0.8);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(255,255,255,0.05);
}

.navbar.scrolled {
    padding: 15px 0;
    background: rgba(8, 8, 9, 0.95);
    box-shadow: 0 4px 20px rgba(0,0,0,0.5);
}

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

.logo {
    font-family: var(--font-heading);
    font-size: 1.8rem;
    font-weight: 700;
    letter-spacing: 2px;
}

.logo-img {
    height: 60px;
    width: auto;
    display: block;
    transition: var(--transition);
    filter: drop-shadow(0 2px 5px rgba(0,0,0,0.5));
}

.logo-img:hover {
    transform: scale(1.05);
}

.nav-links {
    display: flex;
    gap: 30px;
}

.nav-links a {
    font-family: var(--font-heading);
    font-size: 1.1rem;
    text-transform: uppercase;
    font-weight: 500;
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--accent-red);
    transition: var(--transition);
}

.nav-links a:hover::after {
    width: 100%;
}

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

.hamburger {
    display: none;
    font-size: 1.5rem;
    cursor: pointer;
}

/* Hero Section */
.hero {
    height: 100vh;
    min-height: 600px;
    display: flex;
    align-items: center;
    position: relative;
    /* Use a gradient as placeholder until the image is loaded */
    background: linear-gradient(rgba(0,0,0,0.7), rgba(0,0,0,0.8)), url('images/hero.jpg') center/cover no-repeat;
}

/* Add a grid overlay effect */
.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: radial-gradient(rgba(255, 255, 255, 0.1) 1px, transparent 1px);
    background-size: 30px 30px;
    opacity: 0.3;
}

.hero-content {
    position: relative;
    z-index: 10;
    max-width: 800px;
}

.hero-title {
    font-family: var(--font-heading);
    font-size: 4rem;
    line-height: 1.1;
    margin-bottom: 20px;
    text-transform: uppercase;
    text-shadow: 2px 2px 10px rgba(0,0,0,0.8);
}

.hero-subtitle {
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-bottom: 40px;
    font-weight: 300;
}

.hero-buttons {
    display: flex;
    gap: 20px;
}

/* Sections */
.section {
    padding: 100px 0;
}

.section-title {
    font-family: var(--font-heading);
    font-size: 2.5rem;
    text-transform: uppercase;
    margin-bottom: 40px;
    position: relative;
    display: inline-block;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 0;
    width: 50%;
    height: 4px;
    background-color: var(--accent-red);
}

.text-center.section-title::after {
    left: 25%;
}

/* About Section & Professors */
.about-container {
    display: flex;
    align-items: center;
    gap: 60px;
}

.about-container.reverse-layout {
    flex-direction: row-reverse;
}

.about-text {
    flex: 1;
}

.about-text p {
    margin-bottom: 20px;
    font-size: 1.1rem;
    color: var(--text-secondary);
}

.features {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin-top: 40px;
}

.feature {
    background-color: var(--surface-color);
    padding: 20px;
    border-radius: 8px;
    text-align: center;
    transition: var(--transition);
    border: 1px solid rgba(255,255,255,0.05);
}

.feature:hover {
    transform: translateY(-5px);
    border-color: rgba(255,255,255,0.1);
    box-shadow: 0 10px 30px rgba(0,0,0,0.5);
}

.feature i {
    font-size: 2rem;
    margin-bottom: 15px;
}

.feature h3 {
    font-family: var(--font-heading);
    font-size: 1.1rem;
    text-transform: uppercase;
}

.about-image {
    flex: 1;
    position: relative;
}

.about-image img {
    width: 100%;
    border-radius: 8px;
    box-shadow: 0 20px 50px rgba(0,0,0,0.5);
    border: 1px solid rgba(255,255,255,0.1);
}

.about-image::before {
    content: '';
    position: absolute;
    top: -20px;
    left: -20px;
    width: 100%;
    height: 100%;
    border: 3px solid var(--accent-yellow);
    border-radius: 8px;
    z-index: -1;
}

/* Classes Section */
.classes-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 40px;
    margin-top: 50px;
}

.class-card {
    perspective: 1000px;
}

.class-card-inner {
    background-color: var(--surface-color);
    padding: 40px 30px;
    border-radius: 12px;
    text-align: center;
    transition: var(--transition);
    height: 100%;
    border-top: 4px solid var(--accent-yellow);
    position: relative;
    overflow: hidden;
}

.class-card-inner.border-red {
    border-top-color: var(--accent-red);
}

.class-card-inner::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(180deg, rgba(255,255,255,0.02) 0%, transparent 100%);
    pointer-events: none;
}

.class-card-inner:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 40px rgba(0,0,0,0.6);
}

.class-icon {
    font-size: 3.5rem;
    color: var(--accent-yellow);
    margin-bottom: 20px;
}

.class-card h3 {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    margin-bottom: 15px;
    text-transform: uppercase;
}

.class-card p {
    color: var(--text-secondary);
}

/* Schedule Section */
.schedule-subtitle {
    color: var(--text-secondary);
    font-size: 1.2rem;
    margin-top: -30px;
    margin-bottom: 50px;
}

.schedule-wrapper {
    display: flex;
    flex-direction: column;
    gap: 40px;
}

.schedule-image-container {
    width: 100%;
    max-width: 600px;
    margin: 0 auto;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 20px 40px rgba(0,0,0,0.5);
    border: 2px solid rgba(255,255,255,0.1);
}

.schedule-banner {
    width: 100%;
    height: auto;
    display: block;
}

.schedule-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-top: 20px;
}

.schedule-card {
    background-color: var(--surface-color);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0,0,0,0.3);
    transition: var(--transition);
}

.schedule-card:hover {
    transform: translateY(-5px);
}

.card-header {
    padding: 20px;
    text-align: center;
}

.card-header h3 {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    margin: 0;
    letter-spacing: 1px;
}

.card-body {
    padding: 30px;
    text-align: center;
}

.card-body .days {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 10px;
}

.card-body .lang-alt {
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-weight: 400;
}

.card-body .time {
    font-family: var(--font-heading);
    font-size: 2.5rem;
    color: var(--text-primary);
    margin-top: 15px;
}

.gi .time { color: var(--accent-yellow); }
.nogi .time { color: var(--accent-red); }

/* Contact Section */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 50px;
    margin-top: 50px;
}

.info-item {
    display: flex;
    align-items: flex-start;
    gap: 20px;
    margin-bottom: 30px;
    background-color: var(--surface-color);
    padding: 20px;
    border-radius: 8px;
    transition: var(--transition);
}

.info-item:hover {
    background-color: var(--surface-light);
}

.info-item i {
    font-size: 2rem;
    margin-top: 5px;
}

.info-item h4 {
    font-family: var(--font-heading);
    font-size: 1.2rem;
    margin-bottom: 5px;
    text-transform: uppercase;
}

.info-item p, .info-item a {
    color: var(--text-secondary);
}

.info-item a:hover, .hover-text-yellow:hover {
    color: var(--accent-yellow) !important;
}

.map-placeholder {
    width: 100%;
    height: 100%;
    min-height: 400px;
    background-color: var(--surface-color);
    border-radius: 12px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    border: 1px dashed rgba(255,255,255,0.2);
}

.map-placeholder i {
    font-size: 4rem;
    margin-bottom: 20px;
    color: var(--surface-light);
}

/* Footer */
.footer {
    background-color: #000;
    padding: 40px 0;
    text-align: center;
    border-top: 1px solid rgba(255,255,255,0.05);
}

.footer-logo {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 15px;
}

.footer p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Animations */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

.slide-in-left {
    opacity: 0;
    transform: translateX(-50px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

.slide-in-right {
    opacity: 0;
    transform: translateX(50px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

.visible {
    opacity: 1;
    transform: translate(0);
}

.delay-1 { transition-delay: 0.2s; }
.delay-2 { transition-delay: 0.4s; }

/* Responsive Design */
@media (max-width: 992px) {
    .about-container, .contact-grid {
        flex-direction: column;
        grid-template-columns: 1fr;
    }
    
    .about-container.reverse-layout {
        flex-direction: column;
    }
    
    .hero-title {
        font-size: 3rem;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background-color: var(--surface-color);
        flex-direction: column;
        padding: 20px 0;
        text-align: center;
        gap: 15px;
        box-shadow: 0 10px 20px rgba(0,0,0,0.5);
    }
    
    .nav-links.active {
        display: flex;
    }
    
    .hamburger {
        display: block;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-buttons {
        flex-direction: column;
    }
    
    .section {
        padding: 60px 0;
    }
}