/* ===================================
   CSS Variables & Reset
   =================================== */

:root {
    /* Colors */
    --primary: #26005a;
    --secondary: #b650ff;
    --accent: #ff58ac;
    --bg-light: #e4c7ff;
    --dark-accent: #4f0230;
    --highlight-light: #ffc5f9;
    
    /* Light mode colors */
    --bg-color: #ffffff;
    --text-color: #26005a;
    --text-secondary: #4f0230;
    --card-bg: #ffffff;
    --border-color: #e4c7ff;
    --shadow: rgba(38, 0, 90, 0.1);
    
    /* Typography */
    --font-main: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-mono: 'Monaco', 'Courier New', monospace;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;
    
    /* Border radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 16px;
    
    /* Transitions */
    --transition: all 0.3s ease;
}

[data-theme="dark"] {
    --bg-color: #0f0a1a;
    --text-color: #ffffff;
    --text-secondary: #e4c7ff;
    --card-bg: #1a0f2e;
    --border-color: #4f0230;
    --shadow: rgba(182, 80, 255, 0.2);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-main);
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    transition: background-color 0.3s ease, color 0.3s ease;
}

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

/* ===================================
   Navigation
   =================================== */

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: var(--primary);
    padding: var(--spacing-sm) 0;
    z-index: 1000;
    box-shadow: 0 2px 10px var(--shadow);
}

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

.nav-brand {
    font-family: var(--font-mono);
    font-size: 1.5rem;
    font-weight: bold;
    color: #ffffff;
}

.logo-bracket {
    color: var(--accent);
}

.logo-text {
    color: #ffffff;
    margin: 0 0.25rem;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.nav-links a {
    color: #ffffff;
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 500;
    transition: var(--transition);
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent);
    transition: width 0.3s ease;
}

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

.theme-toggle {
    background: transparent;
    border: 2px solid rgba(255, 255, 255, 0.3);
    padding: 0.5rem;
    border-radius: var(--radius-md);
    cursor: pointer;
    font-size: 1.2rem;
    transition: var(--transition);
    display: flex;
    align-items: center;
}

.theme-toggle:hover {
    border-color: var(--accent);
    transform: scale(1.1);
}

.theme-toggle .icon-moon {
    display: none;
}

[data-theme="dark"] .theme-toggle .icon-sun {
    display: none;
}

[data-theme="dark"] .theme-toggle .icon-moon {
    display: inline;
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    background: transparent;
    border: none;
    cursor: pointer;
}

.mobile-menu-toggle span {
    width: 25px;
    height: 3px;
    background: #ffffff;
    margin: 3px 0;
    transition: var(--transition);
}

/* ===================================
   Hero Section
   =================================== */

.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: calc(80px + var(--spacing-lg)) var(--spacing-md) var(--spacing-lg);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, var(--bg-light) 0%, var(--bg-color) 50%, var(--highlight-light) 100%);
    opacity: 0.3;
    z-index: -1;
}

[data-theme="dark"] .hero::before {
    background: linear-gradient(135deg, var(--primary) 0%, var(--dark-accent) 50%, var(--primary) 100%);
    opacity: 0.2;
}

.hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
    align-items: center;
}

.hero-content {
    text-align: left;
}

.glitch-wrapper {
    margin-bottom: var(--spacing-sm);
}

.hero-title {
    font-size: clamp(2.5rem, 6vw, 4rem);
    font-weight: 900;
    color: var(--primary);
    margin-bottom: var(--spacing-sm);
    position: relative;
}

[data-theme="dark"] .hero-title {
    color: var(--secondary);
}

.hero-date {
    font-size: clamp(1.5rem, 3vw, 2rem);
    margin-bottom: var(--spacing-md);
}

.date-highlight {
    background: linear-gradient(90deg, var(--secondary), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-weight: 700;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
    opacity: 0.9;
}

.cta-buttons {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.875rem 1.75rem;
    border-radius: var(--radius-md);
    text-decoration: none;
    font-weight: 600;
    font-size: 1rem;
    transition: var(--transition);
    border: none;
    cursor: pointer;
}

.btn-primary {
    background: var(--secondary);
    color: #ffffff;
}

.btn-primary:hover {
    background: var(--accent);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(182, 80, 255, 0.4);
}

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

[data-theme="dark"] .btn-secondary {
    color: var(--secondary);
    border-color: var(--secondary);
}

.btn-secondary:hover {
    background: var(--primary);
    color: #ffffff;
}

[data-theme="dark"] .btn-secondary:hover {
    background: var(--secondary);
    color: #ffffff;
}

.btn-large {
    padding: 1.125rem 2.5rem;
    font-size: 1.125rem;
}

.arrow {
    transition: transform 0.3s ease;
}

.btn:hover .arrow {
    transform: translateX(5px);
}

.deadline-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: var(--highlight-light);
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-lg);
    font-size: 0.95rem;
    border: 2px solid var(--accent);
}

[data-theme="dark"] .deadline-badge {
    background: var(--dark-accent);
    color: var(--text-color);
}

.badge-icon {
    font-size: 1.25rem;
}

/* Hero Graphic - Code Window */

.hero-graphic {
    display: flex;
    justify-content: center;
    align-items: center;
}

.code-window {
    background: var(--card-bg);
    border-radius: var(--radius-lg);
    box-shadow: 0 10px 40px var(--shadow);
    overflow: hidden;
    max-width: 500px;
    width: 100%;
    border: 1px solid var(--border-color);
}

.window-controls {
    background: var(--primary);
    padding: 0.75rem;
    display: flex;
    gap: 0.5rem;
}

.window-controls span {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: #ff5f56;
}

.window-controls span:nth-child(2) {
    background: #ffbd2e;
}

.window-controls span:nth-child(3) {
    background: #27c93f;
}

.code-content {
    padding: var(--spacing-md);
    font-family: var(--font-mono);
    font-size: 0.875rem;
    line-height: 1.8;
}

.code-content pre {
    margin: 0;
}

.code-keyword {
    color: var(--accent);
    font-weight: 600;
}

.code-variable {
    color: var(--secondary);
}

.code-property {
    color: var(--primary);
}

[data-theme="dark"] .code-property {
    color: var(--bg-light);
}

.code-string {
    color: #27c93f;
}

.code-number {
    color: var(--accent);
}

.scroll-indicator {
    position: absolute;
    bottom: var(--spacing-md);
    left: 50%;
    transform: translateX(-50%);
    font-size: 2rem;
    animation: bounce 2s infinite;
    color: var(--secondary);
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {
        transform: translateX(-50%) translateY(0);
    }
    40% {
        transform: translateX(-50%) translateY(-10px);
    }
    60% {
        transform: translateX(-50%) translateY(-5px);
    }
}

/* ===================================
   Sections
   =================================== */

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

.section-title {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 800;
    margin-bottom: var(--spacing-lg);
    color: var(--primary);
}

[data-theme="dark"] .section-title {
    color: var(--secondary);
}

.title-accent {
    color: var(--accent);
    font-family: var(--font-mono);
    margin-right: 0.5rem;
}

/* About Section */

.about-section {
    background: var(--bg-color);
}

.about-content {
    max-width: 800px;
    margin: 0 auto var(--spacing-lg);
    text-align: center;
}

.lead-text {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-sm);
    line-height: 1.8;
}

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

.stat-card {
    background: var(--card-bg);
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
    text-align: center;
    border: 2px solid var(--border-color);
    transition: var(--transition);
}

.stat-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px var(--shadow);
    border-color: var(--secondary);
}

.stat-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-sm);
}

.stat-number {
    font-size: 3rem;
    font-weight: 900;
    background: linear-gradient(90deg, var(--secondary), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-xs);
}

.stat-label {
    font-size: 1.125rem;
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
    color: var(--primary);
}

[data-theme="dark"] .stat-label {
    color: var(--text-color);
}

.stat-description {
    font-size: 0.9rem;
    opacity: 0.8;
}

/* CFP Section */

.cfp-section {
    background: linear-gradient(135deg, var(--bg-light) 0%, var(--highlight-light) 100%);
}

[data-theme="dark"] .cfp-section {
    background: linear-gradient(135deg, var(--primary) 0%, var(--dark-accent) 100%);
}

.cfp-banner {
    text-align: center;
    background: var(--primary);
    color: #ffffff;
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-lg);
}

.cfp-title {
    font-size: clamp(2.5rem, 5vw, 3.5rem);
    font-weight: 900;
    margin-bottom: var(--spacing-sm);
}

.cfp-deadline {
    font-size: 1.5rem;
}

.cfp-content {
    max-width: 900px;
    margin: 0 auto;
}

.cfp-content h3 {
    font-size: 2rem;
    margin-bottom: var(--spacing-md);
    color: var(--primary);
}

[data-theme="dark"] .cfp-content h3 {
    color: var(--text-color);
}

.cfp-cta-box {
    background: var(--card-bg);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    text-align: center;
    margin: var(--spacing-lg) 0;
    border: 3px solid var(--accent);
}

.info-boxes {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.info-box {
    background: var(--card-bg);
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
    border: 2px solid var(--border-color);
}

.info-icon {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-sm);
}

.info-box h4 {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-sm);
    color: var(--primary);
}

[data-theme="dark"] .info-box h4 {
    color: var(--secondary);
}

/* Sessions Section */

.sessions-section {
    background: var(--bg-color);
}

.sessions-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
}

.session-card {
    background: var(--card-bg);
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
    border: 2px solid var(--border-color);
    transition: var(--transition);
}

.session-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px var(--shadow);
    border-color: var(--secondary);
}

.session-card-highlight {
    background: linear-gradient(135deg, var(--accent), var(--secondary));
    color: #ffffff;
    border: none;
}

.session-card-highlight h3,
.session-card-highlight p {
    color: #ffffff;
}

.session-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-sm);
}

.session-header h3 {
    font-size: 1.375rem;
    color: var(--primary);
}

[data-theme="dark"] .session-header h3 {
    color: var(--secondary);
}

.session-duration {
    background: var(--accent);
    color: #ffffff;
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    font-weight: 600;
}

.session-note {
    margin-top: var(--spacing-lg);
    text-align: center;
    padding: var(--spacing-md);
    background: var(--card-bg);
    border-radius: var(--radius-lg);
    border: 2px solid var(--border-color);
}

.session-note a {
    color: var(--secondary);
    font-weight: 600;
}

.note-disclaimer {
    margin-top: var(--spacing-sm);
    font-size: 0.875rem;
    opacity: 0.8;
}

/* Tracks Section */

.tracks-section {
    background: linear-gradient(135deg, var(--bg-color) 0%, var(--bg-light) 100%);
}

[data-theme="dark"] .tracks-section {
    background: linear-gradient(135deg, var(--bg-color) 0%, var(--primary) 100%);
}

.tracks-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: var(--spacing-md);
}

.track-card {
    background: var(--card-bg);
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
    text-align: center;
    border: 2px solid var(--border-color);
    transition: var(--transition);
}

.track-card:hover {
    transform: translateY(-5px) scale(1.02);
    box-shadow: 0 10px 30px var(--shadow);
    border-color: var(--accent);
}

.track-icon {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-xs);
}

.track-card h3 {
    font-size: 1.125rem;
    margin-bottom: var(--spacing-xs);
    color: var(--primary);
}

[data-theme="dark"] .track-card h3 {
    color: var(--secondary);
}

.track-card p {
    font-size: 0.875rem;
    opacity: 0.8;
}

.track-card-special {
    grid-column: span 2;
    background: linear-gradient(135deg, var(--highlight-light), var(--bg-light));
}

[data-theme="dark"] .track-card-special {
    background: linear-gradient(135deg, var(--dark-accent), var(--primary));
}

/* Contact Section */

.contact-section {
    background: var(--bg-color);
    text-align: center;
}

.contact-content {
    max-width: 600px;
    margin: 0 auto;
}

.contact-text {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-lg);
}

/* Footer */

.footer {
    background: var(--dark-accent);
    color: #ffffff;
    padding: var(--spacing-lg) 0 var(--spacing-md);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.footer-brand {
    font-family: var(--font-mono);
}

.footer-tagline {
    margin-top: var(--spacing-xs);
    opacity: 0.8;
    font-size: 0.9rem;
}

.footer-links {
    display: flex;
    gap: var(--spacing-md);
}

.footer-links a {
    color: #ffffff;
    text-decoration: none;
    transition: var(--transition);
}

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

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-md);
    border-top: 1px solid rgba(255, 255, 255, 0.2);
    font-size: 0.875rem;
    opacity: 0.8;
}

/* ===================================
   Responsive Design
   =================================== */

@media (max-width: 968px) {
    .hero .container {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .hero-content {
        text-align: center;
    }
    
    .cta-buttons {
        justify-content: center;
    }
    
    .hero-graphic {
        order: -1;
        margin-bottom: var(--spacing-md);
    }
    
    .track-card-special {
        grid-column: span 1;
    }
}

@media (max-width: 768px) {
    :root {
        --spacing-lg: 3rem;
        --spacing-xl: 4rem;
    }
    
    .nav-links {
        position: fixed;
        top: 70px;
        left: -100%;
        flex-direction: column;
        background: var(--primary);
        width: 100%;
        padding: var(--spacing-md);
        transition: left 0.3s ease;
        box-shadow: 0 4px 10px var(--shadow);
    }
    
    .nav-links.active {
        left: 0;
    }
    
    .mobile-menu-toggle {
        display: flex;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .sessions-grid,
    .tracks-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        flex-direction: column;
        text-align: center;
    }
    
    .footer-links {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
}

@media (max-width: 480px) {
    .cta-buttons {
        flex-direction: column;
        width: 100%;
    }
    
    .btn {
        width: 100%;
        justify-content: center;
    }
    
    .info-boxes {
        grid-template-columns: 1fr;
    }
}

/* ===================================
   Animations
   =================================== */

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

.stat-card,
.session-card,
.track-card,
.info-box {
    animation: fadeIn 0.6s ease forwards;
}

/* ===================================
   Accessibility
   =================================== */

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

a:focus,
button:focus {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}