/* CSS Variables for Theme Colors */
:root {
    /* 🌑 Dark Mode (The Cyberpunk Grid) - Default Theme */
    --primary-bg: #0D0D0F;
    --secondary-bg: #1a1b1e81;
    --tertiary-bg: #2A2B30;
    --accent-bg: #2A2B30;
    --highlight: #00FFFF;
    --highlight-glow: rgba(35, 85, 85, 0.3);
    --highlight-secondary: #FF3CAC;
    --highlight-secondary-glow: rgba(255, 60, 172, 0.3);
    --interactive-glow: #8B5CF6;
    --interactive-glow-rgba: rgba(139, 92, 246, 0.3);

    /* Text Colors - WCAG AA Compliant */
    --text-primary: #EDEDED;
    --text-secondary: #A5A5A8;
    --text-muted: #A5A5A8;

    /* Accent Colors */
    --success: #2EE6A8;
    --error: #FF3355;
    --warning: #FF3355;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;

    /* Typography */
    --font-primary: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    --font-size-base: 16px;
    --font-size-sm: 0.875rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.5rem;
    --font-size-2xl: 2rem;
    --font-size-3xl: 3rem;

    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* ☀️ Light Mode (The Digital Blueprint) */
[data-theme="light"] {
    --primary-bg: #F7F8FA;
    --secondary-bg: #ffffff61;
    --tertiary-bg: #DADCE0;
    --accent-bg: #DADCE0;
    --highlight: #0066FF;
    --highlight-glow: rgba(0, 102, 255, 0.3);
    --highlight-secondary: #FF4F9E;
    --highlight-secondary-glow: rgba(255, 79, 158, 0.3);
    --interactive-glow: #00E0FF;
    --interactive-glow-rgba: rgba(0, 224, 255, 0.3);

    /* Text Colors */
    --text-primary: #1C1E22;
    --text-secondary: #5A5D60;
    --text-muted: #5A5D60;

    /* Accent Colors */
    --success: #10B981;
    --error: #E63946;
    --warning: #E63946;
}

/* ============================================
   RESET & BASE STYLES
   ============================================ */

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

html {
    scroll-behavior: smooth;
    font-size: var(--font-size-base);
}

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

/* Screen Reader Only Content */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Skip Link for Keyboard Navigation */
.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--highlight);
    color: var(--primary-bg);
    padding: var(--spacing-sm);
    text-decoration: none;
    font-weight: bold;
    z-index: 10000;
}

.skip-link:focus {
    top: 0;
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* Focus Styles for Accessibility */
a:focus,
button:focus,
input:focus,
select:focus,
textarea:focus {
    outline: 3px solid var(--highlight);
    outline-offset: 2px;
}

/* ============================================
   NAVIGATION
   ============================================ */

.navbar {
    background: rgba(13, 13, 15, 0.8);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    position: sticky;
    top: 0;
    z-index: 9999;
    border-bottom: 1px solid rgba(0, 255, 255, 0.2);
    transition: all var(--transition-normal);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3), inset 0 1px 0 rgba(255, 255, 255, 0.05);
}

[data-theme="light"] .navbar {
    background: rgba(247, 248, 250, 0.8);
    border-bottom: 1px solid rgba(0, 102, 255, 0.2);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1), inset 0 1px 0 rgba(255, 255, 255, 0.8);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: var(--spacing-sm);
    padding-bottom: var(--spacing-sm);
}

.nav-brand .logo {
    font-size: var(--font-size-xl);
    font-weight: bold;
    background: linear-gradient(135deg, var(--highlight), var(--highlight-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    flex-direction: column;
    gap: 4px;
    padding: var(--spacing-xs);
    z-index: 10001;
    position: relative;
}

.nav-toggle .hamburger {
    width: 25px;
    height: 3px;
    background: var(--highlight);
    transition: var(--transition-fast);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-md);
    align-items: center;
}

.nav-menu a {
    color: var(--text-secondary);
    text-decoration: none;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: 4px;
    transition: var(--transition-fast);
    font-weight: 500;
}

.nav-menu a:hover,
.nav-menu a:focus {
    color: var(--highlight);
    background: var(--accent-bg);
}

.nav-menu .btn-primary {
    background: var(--highlight);
    color: var(--primary-bg);
}

.nav-menu .btn-primary:hover,
.nav-menu .btn-primary:focus {
    background: var(--highlight-secondary);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px var(--highlight-glow);
}

/* Theme Toggle Button */
.theme-toggle {
    background: var(--tertiary-bg);
    border: 2px solid var(--interactive-glow);
    border-radius: 50%;
    width: 45px;
    height: 45px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
    margin-left: var(--spacing-md);
}

.theme-toggle:hover {
    transform: rotate(180deg) scale(1.1);
    box-shadow: 0 0 20px var(--interactive-glow-rgba);
    border-color: var(--highlight);
}

.theme-toggle:focus {
    outline: 3px solid var(--interactive-glow);
    outline-offset: 2px;
}

.theme-icon {
    font-size: 1.5rem;
    position: absolute;
    transition: all var(--transition-normal);
}

.sun-icon {
    opacity: 0;
    transform: rotate(-180deg) scale(0);
}

.moon-icon {
    opacity: 1;
    transform: rotate(0deg) scale(1);
}

[data-theme="light"] .sun-icon {
    opacity: 1;
    transform: rotate(0deg) scale(1);
}

[data-theme="light"] .moon-icon {
    opacity: 0;
    transform: rotate(180deg) scale(0);
}

/* ============================================
   BUTTONS
   ============================================ */

.btn {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-md);
    border: none;
    border-radius: 6px;
    font-size: var(--font-size-base);
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    transition: var(--transition-normal);
    text-align: center;
}

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

.btn-primary:hover,
.btn-primary:focus {
    background: #00bbff;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px var(--highlight-glow);
}

.btn-secondary {
    background: transparent;
    color: var(--highlight);
    border: 2px solid var(--highlight);
}

.btn-secondary:hover,
.btn-secondary:focus {
    background: var(--highlight);
    color: var(--primary-bg);
}

.btn-large {
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: var(--font-size-lg);
}

/* ============================================
   HERO SECTION
   ============================================ */

.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background:
        radial-gradient(circle at 20% 50%, var(--highlight-glow), transparent 50%),
        radial-gradient(circle at 80% 80%, var(--highlight-secondary-glow), transparent 50%),
        linear-gradient(135deg, var(--primary-bg) 0%, var(--secondary-bg) 100%);
    z-index: -1;
    transition: background var(--transition-slow);
}

/* Three.js Canvas */
.hero-canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    pointer-events: none;
    opacity: 0.4;
}

.hero-background::before {
    position: absolute;
    width: 200%;
    height: 200%;
    background-image:
        repeating-linear-gradient(0deg, transparent, transparent 2px, var(--highlight-glow) 2px, var(--highlight-glow) 4px);
    animation: gridMove 20s linear infinite;
}

@keyframes gridMove {
    0% { transform: translateY(0); }
    100% { transform: translateY(50px); }
}

.hero-content {
    text-align: center;
    z-index: 1;
    padding: var(--spacing-xl) 0;
    max-width: 1000px;
}

/* Top Border - Cyan to Magenta Gradient */
.hero-top-border {
    height: 2px;
    background: linear-gradient(90deg, var(--highlight) 0%, var(--highlight-secondary) 100%);
    margin-bottom: var(--spacing-xl);
    border-radius: 2px;
    box-shadow: 0 0 20px var(--highlight-glow), 0 0 40px var(--highlight-secondary-glow);
    animation: borderGlow 3s ease-in-out infinite alternate;
}

@keyframes borderGlow {
    0% { box-shadow: 0 0 20px var(--highlight-glow), 0 0 40px var(--highlight-secondary-glow); }
    100% { box-shadow: 0 0 30px var(--highlight-glow), 0 0 60px var(--highlight-secondary-glow); }
}

/* Subheading */
.hero-subheading {
    font-size: var(--font-size-sm);
    color: var(--highlight);
    letter-spacing: 4px;
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
    text-transform: uppercase;
    text-shadow: 0 0 10px var(--highlight-glow);
    animation: fadeInUp 0.8s ease-out;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Main Headline */
.hero-headline {
    font-size: clamp(1.8rem, 5vw, 3rem);
    font-weight: 800;
    margin-bottom: var(--spacing-xl);
    line-height: 1.2;
    animation: fadeInUp 0.8s ease-out 0.2s both;
}

.hero-headline-text {
    background: linear-gradient(135deg, var(--highlight), var(--highlight-secondary), var(--interactive-glow));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-shadow: none;
    filter: drop-shadow(0 0 30px var(--highlight-glow));
    letter-spacing: 1px;
}

/* Main Content Box - Glassmorphism */
.hero-main-box {
    background: rgba(26, 27, 30, 0.4);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid rgba(0, 255, 255, 0.3);
    border-radius: 24px;
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
    position: relative;
    box-shadow:
        0 8px 32px rgba(0, 0, 0, 0.3),
        inset 0 1px 0 rgba(255, 255, 255, 0.1),
        0 0 40px rgba(0, 255, 255, 0.1);
    animation: fadeInUp 0.8s ease-out 0.4s both;
}

[data-theme="light"] .hero-main-box {
    background: rgba(247, 248, 250, 0.6);
    border: 1px solid rgba(0, 102, 255, 0.3);
    box-shadow:
        0 8px 32px rgba(0, 0, 0, 0.1),
        inset 0 1px 0 rgba(255, 255, 255, 0.8),
        0 0 40px rgba(0, 102, 255, 0.1);
}

.hero-main-box::before {
    content: '';
    position: absolute;
    top: -2px;
    left: -2px;
    right: -2px;
    bottom: -2px;

    /* 2. USE the custom property for the angle */
    --gradient-angle: 0deg;
    /* background: linear-gradient(var(--gradient-angle), var(--highlight), var(--highlight-secondary), var(--interactive-glow)); */

    border-radius: 24px;
    z-index: -1;
    opacity: 0.3;
    filter: blur(10px);

    /* 3. Apply the animation that changes the variable */
    animation: rotateGradient 1s linear infinite;
}

/* 4. The keyframes now change the value of the CSS variable */
@keyframes rotateGradient {
    from {
        --gradient-angle: 0deg; /* Start angle */
    }
    to {
        --gradient-angle: 360deg; /* End angle */
    }
}

.hero-main-box::after {
    display: none;
}
.hero-details {
    display: flex;
    justify-content: center;
    gap: var(--spacing-lg);
    flex-wrap: wrap;
    margin-bottom: var(--spacing-lg);
}

.hero-info {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    background: rgba(42, 43, 48, 0.5);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid rgba(0, 255, 255, 0.2);
    border-radius: 12px;
    transition: all var(--transition-normal);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

.hero-info:hover {
    border-color: var(--highlight);
    box-shadow: 0 0 20px var(--highlight-glow);
    transform: translateY(-3px);
    background: rgba(42, 43, 48, 0.7);
}

[data-theme="light"] .hero-info {
    background: rgba(233, 235, 238, 0.6);
    border-color: rgba(0, 102, 255, 0.2);
}

[data-theme="light"] .hero-info:hover {
    background: rgba(233, 235, 238, 0.8);
    border-color: var(--highlight);
}

.hero-info .icon {
    font-size: var(--font-size-xl);
}

.hero-cta {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
}

/* Primary CTA - Cyan Gradient Button */
.hero-primary-cta {
    background: linear-gradient(135deg, var(--highlight), var(--interactive-glow));
    color: var(--primary-bg);
    padding: var(--spacing-md) calc(var(--spacing-xl) * 1.5);
    border: none;
    border-radius: 16px;
    font-size: var(--font-size-md);
    font-weight: 700;
    cursor: pointer;
    transition: all var(--transition-normal);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    box-shadow:
        0 8px 25px var(--highlight-glow),
        inset 0 1px 0 rgba(255, 255, 255, 0.3);
    letter-spacing: 1px;
    position: relative;
    overflow: hidden;
}

.hero-primary-cta::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    transition: left 0.5s;
}

.hero-primary-cta:hover::before {
    left: 100%;
}

.hero-primary-cta:hover {
    transform: translateY(-3px);
    box-shadow:
        0 12px 35px var(--highlight-glow),
        inset 0 1px 0 rgba(255, 255, 255, 0.4);
}

.hero-primary-cta:active {
    transform: translateY(-1px);
}

/* Secondary CTA - Magenta Text Link */
.hero-secondary-cta {
    color: var(--highlight-secondary);
    font-size: var(--font-size-md);
    font-weight: 600;
    text-decoration: none;
    position: relative;
    padding: var(--spacing-sm) var(--spacing-md);
    transition: all var(--transition-normal);
    letter-spacing: 0.5px;
    border-radius: 8px;
}

.hero-secondary-cta::before {
    content: '';
    position: absolute;
    inset: 0;
    background: var(--highlight-secondary);
    opacity: 0;
    border-radius: 8px;
    z-index: -1;
    transition: opacity var(--transition-normal);
}

.hero-secondary-cta::after {
    content: '';
    position: absolute;
    bottom: 8px;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 2px;
    background: var(--highlight-secondary);
    transition: width var(--transition-normal);
}

.hero-secondary-cta:hover::before {
    opacity: 0.1;
}

.hero-secondary-cta:hover {
    text-shadow: 0 0 15px var(--highlight-secondary-glow);
}

.hero-secondary-cta:hover::after {
    width: 80%;
}

/* Bottom Border - Cyan to Magenta Gradient */
.hero-bottom-border {
    height: 2px;
    background: linear-gradient(90deg, var(--highlight) 0%, var(--highlight-secondary) 100%);
    margin-top: var(--spacing-xl);
    border-radius: 2px;
    box-shadow: 0 0 20px var(--highlight-glow), 0 0 40px var(--highlight-secondary-glow);
    animation: borderGlow 3s ease-in-out infinite alternate;
}

/* ============================================
   PAGE HEADER (for sub-pages)
   ============================================ */

.page-header {
    padding: 150px 0 80px;
    text-align: center;
    position: relative;
    background: var(--secondary-bg);
    overflow: hidden;
}

.page-header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background:
        radial-gradient(ellipse 80% 50% at 50% -20%, rgba(0, 255, 255, 0.1), transparent),
        radial-gradient(ellipse 60% 50% at 80% 50%, rgba(255, 60, 172, 0.08), transparent),
        radial-gradient(ellipse 60% 50% at 20% 50%, rgba(139, 92, 246, 0.08), transparent);
    opacity: 0.6;
    z-index: 0;
}

[data-theme="light"] .page-header::before {
    background:
        radial-gradient(ellipse 80% 50% at 50% -20%, rgba(0, 102, 255, 0.06), transparent),
        radial-gradient(ellipse 60% 50% at 80% 50%, rgba(255, 79, 158, 0.05), transparent),
        radial-gradient(ellipse 60% 50% at 20% 50%, rgba(0, 224, 255, 0.05), transparent);
}

.page-header > * {
    position: relative;
    z-index: 1;
}

.page-header h1 {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 20px;
    background: linear-gradient(135deg, var(--highlight), var(--highlight-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: fadeInUp 0.8s ease;
}

.page-header p {
    font-size: 1.3rem;
    color: var(--text-secondary);
    max-width: 700px;
    margin: 0 auto;
    animation: fadeInUp 0.8s ease 0.2s both;
}

/* ============================================
   SECTIONS
   ============================================ */

section {
    padding: var(--spacing-xl) 0;
}

.section-title {
    font-size: var(--font-size-2xl);
    text-align: center;
    margin-bottom: var(--spacing-md);
    position: relative;
    display: inline-block;
    width: 100%;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 4px;
    background: linear-gradient(90deg, var(--highlight), var(--highlight-secondary));
    border-radius: 2px;
}

.section-description {
    text-align: center;
    color: var(--text-secondary);
    max-width: 800px;
    margin: 0 auto var(--spacing-xl);
    font-size: var(--font-size-lg);
}

/* ============================================
   ABOUT SECTION
   ============================================ */

.about-section {
    background: var(--secondary-bg);
    transition: background var(--transition-slow);
}

[data-theme="light"] .about-section {
    background: var(--primary-bg);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-xl);
}

.stat-card {
    background: rgba(26, 27, 30, 0.5);
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    padding: var(--spacing-lg);
    border-radius: 16px;
    text-align: center;
    border: 1px solid rgba(0, 255, 255, 0.2);
    transition: var(--transition-normal);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2), inset 0 1px 0 rgba(255, 255, 255, 0.1);
}

[data-theme="light"] .stat-card {
    background: rgba(247, 248, 250, 0.6);
    border-color: rgba(0, 102, 255, 0.2);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1), inset 0 1px 0 rgba(255, 255, 255, 0.8);
}

.stat-card:hover {
    transform: translateY(-8px) scale(1.02);
    border-color: var(--highlight);
    box-shadow: 0 12px 35px var(--highlight-glow), 0 0 30px var(--highlight-glow);
}

.stat-number {
    font-size: var(--font-size-3xl);
    font-weight: bold;
    background: linear-gradient(135deg, var(--highlight), var(--highlight-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-xs);
    filter: drop-shadow(0 0 10px var(--highlight-glow));
}

.stat-label {
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
}

/* ============================================
   EVENTS SECTION
   ============================================ */

.events-section {
    background: var(--secondary-bg);
    transition: background var(--transition-slow);
}

[data-theme="light"] .events-section {
    background: var(--secondary-bg);
}

.events-controls {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
    align-items: center;
    justify-content: center;
}

.search-box {
    flex: 1;
    min-width: 250px;
    max-width: 400px;
}

.search-box input {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--tertiary-bg);
    border: 2px solid var(--tertiary-bg);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: var(--font-size-base);
    transition: var(--transition-fast);
}

.search-box input:focus {
    border-color: var(--interactive-glow);
    box-shadow: 0 0 0 3px var(--interactive-glow-rgba);
}

.filter-group {
    display: flex;
    gap: var(--spacing-xs);
    flex-wrap: wrap;
}

.filter-btn {
    padding: var(--spacing-xs) var(--spacing-md);
    background: var(--tertiary-bg);
    color: var(--text-secondary);
    border: 2px solid var(--tertiary-bg);
    border-radius: 6px;
    cursor: pointer;
    font-size: var(--font-size-sm);
    font-weight: 600;
    transition: var(--transition-fast);
}

.filter-btn:hover,
.filter-btn:focus {
    border-color: var(--interactive-glow);
    color: var(--highlight);
}

.filter-btn.active {
    background: var(--highlight);
    color: var(--primary-bg);
    border-color: var(--highlight);
}

.sort-group {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.sort-group label {
    color: var(--text-secondary);
    font-weight: 600;
}

.sort-group select {
    padding: var(--spacing-xs) var(--spacing-sm);
    background: var(--tertiary-bg);
    color: var(--text-primary);
    border: 2px solid var(--tertiary-bg);
    border-radius: 6px;
    cursor: pointer;
    font-size: var(--font-size-sm);
    transition: var(--transition-fast);
}

.sort-group select:focus {
    border-color: var(--interactive-glow);
}

/* Events Grid */
.events-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: var(--spacing-lg);
}

.event-card {
    background: rgba(26, 27, 30, 0.134);
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    border: 1px solid rgba(0, 255, 255, 0.2);
    border-radius: 16px;
    overflow: hidden;
    transition: all var(--transition-normal);
    cursor: pointer;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2), inset 0 1px 0 rgba(255, 255, 255, 0.1);
}

[data-theme="light"] .event-card {
    background: rgba(247, 248, 250, 0.6);
    border: 1px solid rgba(0, 102, 255, 0.2);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1), inset 0 1px 0 rgba(255, 255, 255, 0.8);
}

.event-card:hover,
.event-card:focus-within {
    transform: translateY(-8px) scale(1.02);
    border-color: var(--highlight);
    box-shadow: 0 12px 35px var(--highlight-glow), 0 0 30px var(--highlight-glow);
}

.event-image {
    width: 100%;
    height: 200px;
    object-fit: cover;
    background: none;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 4rem;
}

.event-content {
    padding: var(--spacing-md);
}

.event-category {
    display: inline-block;
    padding: 4px 12px;
    background: var(--tertiary-bg);
    color: var(--highlight);
    border-radius: 20px;
    font-size: var(--font-size-sm);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.event-title {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.event-description {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
    line-height: 1.5;
}

.event-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: var(--spacing-sm);
    border-top: 1px solid var(--tertiary-bg);
}

.event-date,
.event-prize {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    color: var(--text-muted);
    font-size: var(--font-size-sm);
}

.event-prize {
    color: var(--success);
    font-weight: 700;
}

.event-fee {
    margin-top: var(--spacing-sm);
    padding: var(--spacing-xs) var(--spacing-sm);
    background: linear-gradient(135deg, rgba(0, 255, 255, 0.1), rgba(255, 0, 255, 0.1));
    border-radius: 8px;
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: var(--font-size-sm);
    color: var(--highlight);
    border: 1px solid rgba(0, 255, 255, 0.2);
}

.event-fee strong {
    color: #00FF88;
    font-size: 1rem;
}

.no-results {
    text-align: center;
    padding: var(--spacing-xl);
    color: var(--text-muted);
    font-size: var(--font-size-lg);
}

/* ============================================
   MODAL
   ============================================ */

.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 2000;
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.85);
    backdrop-filter: blur(5px);
}

.modal-content {
    position: relative;
    background: var(--secondary-bg);
    border: 2px solid var(--highlight);
    border-radius: 16px;
    max-width: 800px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    padding: var(--spacing-xl);
    z-index: 1;
    animation: modalSlideIn 0.3s ease;
}

@keyframes modalSlideIn {
    from {
        opacity: 0;
        transform: translateY(-50px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.modal-close {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
    background: var(--error);
    color: white;
    border: none;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    font-size: var(--font-size-xl);
    cursor: pointer;
    transition: var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-close:hover,
.modal-close:focus {
    background: #ff6b7a;
    transform: rotate(90deg);
}

.modal-title {
    font-size: var(--font-size-2xl);
    margin-bottom: var(--spacing-md);
    color: var(--highlight);
}

.modal-meta {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-md);
    border-bottom: 2px solid var(--accent-bg);
}

.modal-meta-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    color: var(--text-secondary);
}

.modal-meta-item.entry-fee-highlight {
    background: linear-gradient(135deg, rgba(0, 255, 136, 0.1), rgba(0, 255, 255, 0.1));
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: 8px;
    border: 1px solid rgba(0, 255, 136, 0.3);
}

.fee-amount {
    color: #00FF88;
    font-weight: 700;
    font-size: 1.1rem;
}

.modal-section {
    margin-bottom: var(--spacing-lg);
}

.modal-section h3 {
    font-size: var(--font-size-xl);
    color: var(--highlight);
    margin-bottom: var(--spacing-sm);
}

.modal-section p,
.modal-section ul {
    color: var(--text-secondary);
    line-height: 1.8;
}

.modal-section ul {
    list-style-position: inside;
    padding-left: var(--spacing-md);
}

.modal-section ul li {
    margin-bottom: var(--spacing-xs);
}

.modal-contact {
    background: var(--accent-bg);
    padding: var(--spacing-md);
    border-radius: 8px;
    margin-top: var(--spacing-md);
}

.modal-actions {
    display: flex;
    gap: var(--spacing-md);
    margin-top: var(--spacing-xl);
}

.modal-actions .btn {
    flex: 1;
}

/* ============================================
   SCHEDULE SECTION
   ============================================ */

.schedule-section {
    background: #1a1b1e81;
    transition: background var(--transition-slow);
}

[data-theme="light"] .schedule-section {
    background: var(--secondary-bg);
}

.schedule-controls {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
    flex-wrap: wrap;
}

.day-btn {
    padding: var(--spacing-sm) var(--spacing-lg);
    background: var(--tertiary-bg);
    color: var(--text-secondary);
    border: 2px solid var(--tertiary-bg);
    border-radius: 8px;
    cursor: pointer;
    font-size: var(--font-size-base);
    font-weight: 600;
    transition: var(--transition-fast);
}

.day-btn:hover,
.day-btn:focus {
    border-color: var(--interactive-glow);
    color: var(--highlight);
}

.day-btn.active {
    background: var(--highlight);
    color: var(--primary-bg);
    border-color: var(--highlight);
}

.schedule-timeline {
    max-width: 1000px;
    margin: 0 auto;
    position: relative;
    padding-left: var(--spacing-lg);
}

.schedule-timeline::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 3px;
    background: linear-gradient(180deg, var(--highlight), var(--highlight-secondary), var(--interactive-glow));
    border-radius: 2px;
    box-shadow: 0 0 15px var(--highlight-glow);
}

.schedule-item {
    display: flex;
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
    background: rgba(26, 27, 30, 0.5);
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    border: 1px solid rgba(0, 255, 255, 0.2);
    border-radius: 16px;
    margin-bottom: var(--spacing-lg);
    transition: all var(--transition-normal);
    position: relative;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2), inset 0 1px 0 rgba(255, 255, 255, 0.1);
}

[data-theme="light"] .schedule-item {
    background: rgba(247, 248, 250, 0.6);
    border: 1px solid rgba(0, 102, 255, 0.2);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1), inset 0 1px 0 rgba(255, 255, 255, 0.8);
}

.schedule-item::before {
    content: '';
    position: absolute;
    left: calc(-1 * var(--spacing-lg) - 8px);
    top: 50%;
    transform: translateY(-50%);
    width: 16px;
    height: 16px;
    background: var(--highlight);
    border: 3px solid var(--primary-bg);
    border-radius: 50%;
    box-shadow: 0 0 15px var(--highlight-glow), 0 0 30px var(--highlight-glow);
    z-index: 1;
}

.schedule-item::after {
    content: '';
    position: absolute;
    left: calc(-1 * var(--spacing-lg) - 5px);
    top: 50%;
    transform: translateY(-50%);
    width: 10px;
    height: 10px;
    background: var(--highlight);
    border-radius: 50%;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% {
        box-shadow: 0 0 0 0 var(--highlight-glow);
        opacity: 1;
    }
    50% {
        box-shadow: 0 0 0 10px transparent;
        opacity: 0.5;
    }
}

.schedule-item:hover {
    transform: translateX(10px) scale(1.02);
    box-shadow: 0 8px 30px var(--highlight-glow), inset 0 1px 0 rgba(255, 255, 255, 0.2);
    border-color: var(--highlight);
}

.schedule-time {
    font-size: var(--font-size-lg);
    font-weight: 700;
    background: linear-gradient(135deg, var(--highlight), var(--highlight-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    min-width: 120px;
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.schedule-details {
    flex: 1;
}

.schedule-event-name {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.schedule-location {
    color: var(--text-muted);
    font-size: var(--font-size-sm);
}

/* ============================================
   CONTACT SECTION
   ============================================ */

.contact-section {
    background: var(--primary-bg);
    transition: background var(--transition-slow);
}

[data-theme="light"] .contact-section {
    background: var(--secondary-bg);
}

.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: var(--spacing-xl);
    margin-top: var(--spacing-xl);
}

.contact-info h3,
.map-container h3 {
    font-size: var(--font-size-xl);
    color: var(--highlight);
    margin-bottom: var(--spacing-md);
}

.contact-item {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.contact-item .icon {
    font-size: var(--font-size-2xl);
    flex-shrink: 0;
}

.contact-item strong {
    display: block;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

.contact-item p {
    color: var(--text-secondary);
    line-height: 1.6;
}

.contact-item a {
    color: var(--highlight);
    text-decoration: none;
    transition: var(--transition-fast);
}

.contact-item a:hover,
.contact-item a:focus {
    text-decoration: underline;
}

.organizers {
    margin-top: var(--spacing-xl);
}

.organizers h4 {
    font-size: var(--font-size-lg);
    color: var(--highlight);
    margin-bottom: var(--spacing-md);
}

.organizer-card {
    background: var(--tertiary-bg);
    padding: var(--spacing-md);
    border-radius: 8px;
    border-left: 3px solid var(--interactive-glow);
    margin-bottom: var(--spacing-md);
    transition: var(--transition-fast);
}

.organizer-card:hover {
    border-left-color: var(--highlight);
}

.organizer-card strong {
    display: block;
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-xs);
}

.organizer-card p {
    color: var(--text-secondary);
    margin: 4px 0;
}

.map-container {
    display: flex;
    flex-direction: column;
}

.map-placeholder {
    flex: 1;
    background: var(--tertiary-bg);
    border: 2px solid var(--tertiary-bg);
    border-radius: 12px;
    overflow: hidden;
    min-height: 400px;
}

.map-placeholder img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* ============================================
   REGISTRATION SECTION
   ============================================ */

.register-section {
    background: none;
    transition: background var(--transition-slow);
    position: relative;
    overflow: hidden;
}


@keyframes floatGlow {
    0%, 100% { transform: translate(0, 0); }
    50% { transform: translate(50%, 20%); }
}



.registration-form {
    max-width: 900px;
    margin: 0 auto;
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    padding: calc(var(--spacing-xl) * 1.5);
    border-radius: 24px;
    border: 1px solid rgba(29, 37, 37, 0.3);
    box-shadow:
        0 8px 32px rgba(0, 0, 0, 0.3),
        inset 0 1px 0 rgba(255, 255, 255, 0.1),
        0 0 60px rgba(0, 255, 255, 0.15);
    position: relative;
}

[data-theme="light"] .registration-form {
    background: rgba(247, 248, 250, 0.7);
    border: 1px solid rgba(0, 102, 255, 0.3);
    box-shadow:
        0 8px 32px rgba(0, 0, 0, 0.1),
        inset 0 1px 0 rgba(255, 255, 255, 0.8),
        0 0 60px rgba(0, 102, 255, 0.15);
}



.form-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.form-group {
    display: flex;
    flex-direction: column;
}

.form-group.full-width {
    grid-column: 1 / -1;
}

.form-group label {
    color: var(--text-primary);
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    font-size: var(--font-size-base);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.required {
    color: var(--error);
    text-shadow: 0 0 5px var(--error);
}

.form-group input,
.form-group select {
    padding: var(--spacing-md);
    background: rgba(42, 43, 48, 0.6);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid rgba(0, 255, 255, 0.2);
    border-radius: 12px;
    color: var(--text-primary);
    font-size: var(--font-size-base);
    transition: var(--transition-fast);
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.2);
}

[data-theme="light"] .form-group input,
[data-theme="light"] .form-group select {
    background: rgba(233, 235, 238, 0.6);
    border: 1px solid rgba(0, 102, 255, 0.2);
}

.form-group input:focus,
.form-group select:focus {
    border-color: var(--highlight);
    box-shadow:
        0 0 0 3px var(--highlight-glow),
        inset 0 2px 4px rgba(0, 0, 0, 0.2),
        0 0 20px var(--highlight-glow);
    background: rgba(42, 43, 48, 0.8);
}

[data-theme="light"] .form-group input:focus,
[data-theme="light"] .form-group select:focus {
    background: rgba(233, 235, 238, 0.9);
}

.form-group input.error,
.form-group select.error {
    border-color: var(--error);
    box-shadow: 0 0 10px rgba(255, 51, 85, 0.3);
}

.error-message {
    color: var(--error);
    font-size: var(--font-size-sm);
    margin-top: var(--spacing-xs);
    min-height: 1.2em;
}

.success-message {
    max-width: 600px;
    margin: var(--spacing-xl) auto;
    background: var(--accent-bg);
    padding: var(--spacing-xl);
    border-radius: 12px;
    border: 2px solid var(--success);
    text-align: center;
    animation: modalSlideIn 0.5s ease;
}

.success-icon {
    display: inline-block;
    width: 60px;
    height: 60px;
    background: var(--success);
    color: var(--primary-bg);
    border-radius: 50%;
    font-size: var(--font-size-2xl);
    line-height: 60px;
    margin-bottom: var(--spacing-md);
}

.success-message h3 {
    color: var(--success);
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-sm);
}

.success-message p {
    color: var(--text-secondary);
}

/* ============================================
   FOOTER
   ============================================ */

.footer {
    background: var(--secondary-bg);
    padding: var(--spacing-xl) 0 var(--spacing-md);
    border-top: 2px solid var(--accent-bg);
    transition: background var(--transition-slow);
}

[data-theme="light"] .footer {
    background: var(--primary-bg);
    border-top-color: var(--text-secondary);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-lg);
}

.footer-section h3,
.footer-section h4 {
    color: var(--highlight);
    margin-bottom: var(--spacing-md);
}

.footer-section p {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: var(--spacing-md);
}

/* Social Links */
.social-links {
    display: flex;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-md);
    flex-wrap: wrap;
}

.social-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    background: rgba(42, 43, 48, 0.6);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid rgba(0, 255, 255, 0.2);
    border-radius: 12px;
    color: var(--highlight);
    transition: all var(--transition-normal);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
}

[data-theme="light"] .social-icon {
    background: rgba(233, 235, 238, 0.6);
    border: 1px solid rgba(0, 102, 255, 0.2);
}

.social-icon:hover {
    background: var(--primary-bg);
    color: black;
    border-color: var(--highlight);
    transform: translateY(-5px) rotate(5deg);
    box-shadow: 0 8px 25px var(--highlight-glow);
}

.social-icon:active {
    transform: translateY(-2px) rotate(5deg);
}

.social-icon svg {
    width: 20px;
    height: 20px;
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: var(--spacing-xs);
}

.footer-section a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: var(--transition-fast);
}

.footer-section a:hover,
.footer-section a:focus {
    color: var(--highlight);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--accent-bg);
    color: var(--text-muted);
}

/* ============================================
   RESPONSIVE DESIGN
   ============================================ */

@media (max-width: 768px) {
    :root {
        --font-size-3xl: 2rem;
        --font-size-2xl: 1.5rem;
    }

    .nav-toggle {
        display: flex;
    }

    .nav-menu {
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background: rgba(26, 26, 46, 0.98);
        backdrop-filter: blur(10px);
        flex-direction: column;
        align-items: stretch;
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.3s ease;
        z-index: 10000;
        pointer-events: none;
    }

    [data-theme="light"] .nav-menu {
        background: rgba(255, 255, 255, 0.98);
    }

    .nav-menu.active {
        max-height: 500px;
        overflow-y: auto;
        border-bottom: 2px solid var(--accent-bg);
        box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
        pointer-events: auto;
    }

    .theme-toggle {
        position: absolute;
        right: 60px;
        top: 10px;
        z-index: 10002;
    }

    .nav-toggle {
        z-index: 10001;
        position: relative;
    }

    .nav-menu li {
        text-align: center;
        border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    }

    .nav-menu li:last-child {
        border-bottom: none;
    }

    .nav-menu a {
        display: block;
        padding: var(--spacing-md);
        position: relative;
        z-index: 10001;
        cursor: pointer;
        -webkit-tap-highlight-color: transparent;
        touch-action: manipulation;
        -webkit-user-select: none;
        user-select: none;
    }

    .nav-menu a:active {
        background: rgba(0, 255, 255, 0.1);
    }

    .hero-details {
        flex-direction: column;
        align-items: center;
    }

    .hero-canvas {
        opacity: 0.5;
    }

    .hero-cta {
        flex-direction: column;
    }

    .hero-cta .btn {
        width: 100%;
    }

    .events-controls {
        flex-direction: column;
    }

    .search-box {
        max-width: 100%;
    }

    .filter-group {
        justify-content: center;
    }

    .events-grid {
        grid-template-columns: 1fr;
    }

    .contact-grid {
        grid-template-columns: 1fr;
    }

    .modal-content {
        width: 95%;
        padding: var(--spacing-md);
    }

    .modal-actions {
        flex-direction: column;
    }

    .form-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-sm);
    }

    .schedule-controls {
        flex-direction: column;
    }

    .day-btn {
        width: 100%;
    }

    .schedule-item {
        flex-direction: column;
    }

    .schedule-time {
        min-width: auto;
    }
}

/* ============================================
   PRINT STYLES
   ============================================ */

@media print {
    .navbar,
    .nav-toggle,
    .hero-background,
    .filter-btn,
    .sort-group,
    .btn,
    .footer {
        display: none;
    }

    body {
        background: white;
        color: black;
    }

    .event-card {
        break-inside: avoid;
        border: 1px solid #333;
    }
}

/* ============================================
   REDUCED MOTION
   ============================================ */

@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }

    html {
        scroll-behavior: auto;
    }
}