/* ============ CSS Variables & Reset ============ */
        :root {
            --bg-primary: #0A0E1A;
            --bg-secondary: #111827;
            --bg-card: #1A1F35;
            --bg-card-hover: #1E2642;
            --text-primary: #F1F5F9;
            --text-secondary: #94A3B8;
            --text-muted: #8290A8;
            --accent-blue: #4F6EF7;
            --accent-blue-dim: rgba(79, 110, 247, 0.15);
            --accent-purple: #8B5CF6;
            --accent-purple-dim: rgba(139, 92, 246, 0.15);
            --accent-cyan: #22D3EE;
            --accent-cyan-dim: rgba(34, 211, 238, 0.12);
            --accent-amber: #F59E0B;
            --accent-amber-dim: rgba(245, 158, 11, 0.15);
            --success: #10B981;
            --border: #1E293B;
            --border-light: #334155;
            --gradient-brand: linear-gradient(135deg, #3F5BE0 0%, #7C4EEC 100%);
            --radius-sm: 8px;
            --radius: 12px;
            --radius-lg: 16px;
            --radius-xl: 24px;
            --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
            --shadow: 0 4px 6px rgba(0, 0, 0, 0.3), 0 2px 4px rgba(0, 0, 0, 0.2);
            --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.4), 0 4px 10px rgba(0, 0, 0, 0.3);
            --shadow-glow-blue: 0 0 20px rgba(79, 110, 247, 0.25);
            --shadow-glow-purple: 0 0 20px rgba(139, 92, 246, 0.25);
            --transition: 200ms cubic-bezier(0.4, 0, 0.2, 1);
            --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);
            --max-width: 1200px;
            --nav-height: 72px;
        }

        /* ============ Light Theme ============ */
        [data-theme="light"] {
            --bg-primary: #F8FAFC;
            --bg-secondary: #F1F5F9;
            --bg-card: #FFFFFF;
            --bg-card-hover: #F1F5F9;
            --text-primary: #0F172A;
            --text-secondary: #475569;
            --text-muted: #5A6B82;
            --border: #E2E8F0;
            --border-light: #CBD5E1;
            --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
            --shadow: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
            --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.06), 0 4px 6px rgba(0, 0, 0, 0.04);
            --shadow-glow-blue: 0 0 20px rgba(79, 110, 247, 0.18);
            --shadow-glow-purple: 0 0 20px rgba(139, 92, 246, 0.18);
            --accent-blue-dim: rgba(79, 110, 247, 0.08);
            --accent-purple-dim: rgba(139, 92, 246, 0.08);
            --accent-cyan-dim: rgba(34, 211, 238, 0.08);
            --accent-amber-dim: rgba(245, 158, 11, 0.1);
        }

        /* Smooth theme transition */
        body {
            transition: background-color 0.35s ease, color 0.35s ease;
        }

        /* Light mode overrides for hardcoded dark-surface elements */
        [data-theme="light"] .navbar.scrolled {
            background: rgba(248, 250, 252, 0.85);
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
        }
        [data-theme="light"] .mobile-nav {
            background: rgba(248, 250, 252, 0.97);
        }
        [data-theme="light"] .btn-secondary {
            background: rgba(0, 0, 0, 0.03);
            color: var(--text-primary);
        }
        [data-theme="light"] .btn-secondary:hover {
            background: rgba(0, 0, 0, 0.06);
            border-color: rgba(0, 0, 0, 0.15);
        }
        [data-theme="light"] .faq-icon {
            background: rgba(0, 0, 0, 0.04);
        }
        [data-theme="light"] .faq-item.active .faq-icon {
            background: var(--accent-blue-dim);
        }
        [data-theme="light"] .bento-tag {
            background: rgba(0, 0, 0, 0.03);
            border-color: var(--border);
        }
        [data-theme="light"] .footer-social a {
            background: rgba(0, 0, 0, 0.03);
        }
        [data-theme="light"] .footer-social a:hover {
            background: rgba(0, 0, 0, 0.06);
        }
        [data-theme="light"] .modal-close {
            background: rgba(0, 0, 0, 0.03);
        }
        [data-theme="light"] .modal-close:hover {
            background: rgba(0, 0, 0, 0.06);
        }
        [data-theme="light"] .modal-overlay {
            background: rgba(248, 250, 252, 0.85);
        }
        [data-theme="light"] .qr-placeholder {
            background: var(--bg-secondary);
        }
        [data-theme="light"] .event-image {
            background: linear-gradient(135deg, #E2E8F0 0%, #F1F5F9 100%);
        }
        [data-theme="light"] .event-image::after {
            background: linear-gradient(180deg, transparent 50%, var(--bg-card));
        }
        /* Light mode: darken accent-colored micro-labels for contrast */
        [data-theme="light"] .section-tag {
            color: #0E7490;
            background: rgba(14, 116, 144, 0.10);
            border-color: rgba(14, 116, 144, 0.25);
        }
        [data-theme="light"] .hero-badge {
            color: #3B4FD6;
            background: rgba(59, 79, 214, 0.08);
            border-color: rgba(59, 79, 214, 0.25);
        }


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

        html {
            scroll-behavior: smooth;
            scroll-padding-top: var(--nav-height);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        body {
            font-family: 'DM Sans', system-ui, -apple-system, sans-serif;
            background-color: var(--bg-primary);
            color: var(--text-primary);
            line-height: 1.6;
            overflow-x: hidden;
            min-height: 100vh;
        }

        /* Focus styles for accessibility */
        :focus-visible {
            outline: 2px solid var(--accent-cyan);
            outline-offset: 2px;
            border-radius: 4px;
        }

        /* Selection */
        ::selection {
            background: var(--accent-blue);
            color: #fff;
        }

        /* ============ Typography ============ */
        h1, h2, h3, h4, h5, h6 {
            font-family: 'Space Grotesk', system-ui, sans-serif;
            font-weight: 600;
            line-height: 1.2;
            letter-spacing: -0.02em;
        }

        h1 { font-size: clamp(2.5rem, 5vw, 4rem); }
        h2 { font-size: clamp(2rem, 4vw, 3rem); }
        h3 { font-size: clamp(1.25rem, 2.5vw, 1.75rem); }

        p {
            color: var(--text-secondary);
            font-size: 1.0625rem;
            line-height: 1.75;
        }

        a {
            color: inherit;
            text-decoration: none;
        }

        /* ============ Container ============ */
        .container {
            width: 100%;
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 1.5rem;
        }

        /* ============ Section ============ */
        .section {
            padding: 6rem 0;
            position: relative;
        }

        .section-header {
            text-align: center;
            margin-bottom: 4rem;
        }

        .section-tag {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            font-family: 'Space Grotesk', sans-serif;
            font-size: 0.875rem;
            font-weight: 500;
            letter-spacing: 0.05em;
            text-transform: uppercase;
            color: var(--accent-cyan);
            background: var(--accent-cyan-dim);
            padding: 0.375rem 1rem;
            border-radius: 100px;
            margin-bottom: 1rem;
            border: 1px solid rgba(34, 211, 238, 0.2);
        }

        .section-title {
            margin-bottom: 1rem;
            background: linear-gradient(135deg, var(--text-primary) 0%, var(--text-muted) 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .section-desc {
            max-width: 600px;
            margin: 0 auto;
            color: var(--text-secondary);
            font-size: 1.125rem;
        }

        /* ============ Navbar ============ */
        .navbar {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 100;
            height: var(--nav-height);
            transition: var(--transition-slow);
        }

        .navbar.scrolled {
            background: rgba(10, 14, 26, 0.85);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border-bottom: 1px solid var(--border);
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
        }

        .navbar-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 1.5rem;
        }

        .nav-logo {
            display: flex;
            align-items: center;
            gap: 0.625rem;
            font-family: 'Space Grotesk', sans-serif;
            font-weight: 700;
            font-size: 1.25rem;
            letter-spacing: -0.01em;
            color: var(--text-primary);
            cursor: pointer;
            transition: opacity var(--transition);
            text-decoration: none;
        }

        .nav-logo:hover {
            opacity: 0.85;
        }

        .nav-logo-icon {
            width: 36px;
            height: 36px;
            background: rgba(79, 110, 247, 0.08);
            border: 1.5px solid rgba(79, 110, 247, 0.2);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.125rem;
            flex-shrink: 0;
            transition: border-color var(--transition-slow), box-shadow var(--transition-slow);
            overflow: hidden;
        }
        .nav-logo-icon:hover {
            border-color: rgba(79, 110, 247, 0.4);
            box-shadow: var(--shadow-glow-blue);
        }

        .nav-logo-icon svg {
            width: 18px;
            height: 18px;
            color: var(--accent-blue);
            opacity: 0.6;
        }

        /* Nav emblem: hide fallback when image loads; show when image missing */
        .emblem-img {
            width: 100%;
            height: 100%;
            object-fit: contain;
            border-radius: 50%;
        }
        .emblem-fallback { display: none; }
        .nav-logo-icon[data-fallback="show"] .emblem-fallback { display: block; }
        .nav-logo-icon[data-fallback="show"] .emblem-img { display: none; }

        .nav-links {
            display: flex;
            align-items: center;
            gap: 2rem;
            list-style: none;
        }

        .nav-links a {
            font-size: 0.9375rem;
            font-weight: 500;
            color: var(--text-secondary);
            transition: color var(--transition);
            position: relative;
            cursor: pointer;
        }

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

        .nav-links a:hover,
        .nav-links a.active {
            color: var(--text-primary);
        }

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

        .nav-cta {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            padding: 0.875rem 1.5rem;
            background: var(--gradient-brand);
            color: #fff;
            font-family: 'Space Grotesk', sans-serif;
            font-weight: 600;
            font-size: 0.9375rem;
            border-radius: 100px;
            border: none;
            cursor: pointer;
            transition: transform var(--transition), box-shadow var(--transition), opacity var(--transition);
            white-space: nowrap;
        }

        .nav-cta:hover {
            transform: translateY(-2px);
            box-shadow: var(--shadow-glow-blue);
        }

        .nav-cta:active {
            transform: translateY(0);
        }

        /* Theme Toggle */
        .theme-toggle {
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background: none;
            border: none;
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--text-secondary);
            transition: color var(--transition), background var(--transition);
            margin-right: 0.25rem;
        }
        .theme-toggle:hover {
            color: var(--text-primary);
            background: rgba(255, 255, 255, 0.05);
        }
        [data-theme="light"] .theme-toggle:hover {
            background: rgba(0, 0, 0, 0.04);
        }
        /* Show/hide sun/moon based on theme */
        .icon-sun { display: none; }
        .icon-moon { display: block; }
        [data-theme="light"] .icon-sun { display: block; }
        [data-theme="light"] .icon-moon { display: none; }

        /* Hamburger */
        .hamburger {
            display: none;
            width: 44px;
            height: 44px;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            gap: 5px;
            cursor: pointer;
            padding: 4px;
            background: none;
            border: none;
            z-index: 101;
        }

        .hamburger span {
            display: block;
            width: 24px;
            height: 2px;
            background: var(--text-primary);
            border-radius: 2px;
            transition: var(--transition);
        }

        .hamburger.active span:nth-child(1) {
            transform: translateY(7px) rotate(45deg);
        }

        .hamburger.active span:nth-child(2) {
            opacity: 0;
        }

        .hamburger.active span:nth-child(3) {
            transform: translateY(-7px) rotate(-45deg);
        }

        /* ============ Hero Section ============ */
        .hero {
            min-height: 100vh;
            min-height: 100dvh;
            display: flex;
            align-items: center;
            position: relative;
            overflow: hidden;
            padding-top: var(--nav-height);
        }

        .hero-canvas {
            position: absolute;
            inset: 0;
            width: 100%;
            height: 100%;
            z-index: 0;
            pointer-events: none;
        }

        .hero-bg-gradient {
            position: absolute;
            inset: 0;
            z-index: 0;
            background:
                radial-gradient(ellipse 80% 60% at 50% 40%, rgba(79, 110, 247, 0.08) 0%, transparent 60%),
                radial-gradient(ellipse 60% 50% at 80% 20%, rgba(139, 92, 246, 0.06) 0%, transparent 50%),
                radial-gradient(ellipse 50% 40% at 20% 80%, rgba(34, 211, 238, 0.04) 0%, transparent 50%);
        }

        .hero-content {
            position: relative;
            z-index: 1;
            text-align: center;
            max-width: 800px;
            margin: 0 auto;
            padding: 1rem 1.5rem 4rem;
        }

        /* Hero Emblem */
        .hero-emblem {
            width: clamp(100px, 24vw, 220px);
            height: clamp(100px, 24vw, 220px);
            border-radius: 50%;
            margin: 0 auto 1rem;
            background: rgba(79, 110, 247, 0.08);
            border: 2px solid rgba(79, 110, 247, 0.2);
            display: flex;
            align-items: center;
            justify-content: center;
            overflow: hidden;
            animation: fadeInUp 0.6s ease both;
            transition: border-color var(--transition-slow), box-shadow var(--transition-slow);
        }
        .hero-emblem:hover {
            border-color: rgba(79, 110, 247, 0.4);
            box-shadow: var(--shadow-glow-blue);
        }
        .hero-emblem-img {
            width: 100%;
            height: 100%;
            object-fit: contain;
            border-radius: 50%;
        }
        .hero-emblem-placeholder {
            color: rgba(79, 110, 247, 0.35);
            display: flex;
            align-items: center;
            justify-content: center;
        }
        .hero-emblem.no-img .hero-emblem-placeholder { display: flex; }
        .hero-emblem:not(.no-img) .hero-emblem-placeholder { display: none; }

        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            padding: 0.375rem 1rem;
            background: rgba(79, 110, 247, 0.1);
            border: 1px solid rgba(79, 110, 247, 0.25);
            border-radius: 100px;
            font-family: 'Space Grotesk', sans-serif;
            font-size: 0.875rem;
            font-weight: 500;
            color: var(--accent-blue);
            margin-bottom: 1rem;
            animation: fadeInUp 0.6s ease both;
        }

        .hero-badge-dot {
            width: 8px;
            height: 8px;
            background: var(--accent-cyan);
            border-radius: 50%;
            animation: pulse-dot 2s ease-in-out infinite;
        }

        @keyframes pulse-dot {
            0%, 100% { opacity: 1; transform: scale(1); }
            50% { opacity: 0.5; transform: scale(0.7); }
        }

        .hero-title {
            font-size: clamp(2.75rem, 6vw, 4.5rem);
            font-weight: 700;
            letter-spacing: -0.03em;
            margin-bottom: 1.5rem;
            animation: fadeInUp 0.6s 0.1s ease both;
        }

        .hero-title-gradient {
            background: linear-gradient(135deg, var(--accent-blue) 0%, var(--accent-cyan) 40%, var(--accent-purple) 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .hero-subtitle {
            font-size: clamp(1.0625rem, 2vw, 1.25rem);
            color: var(--text-secondary);
            margin-bottom: 2rem;
            max-width: 560px;
            margin-left: auto;
            margin-right: auto;
            animation: fadeInUp 0.6s 0.2s ease both;
        }

        .hero-actions {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 1rem;
            flex-wrap: wrap;
            animation: fadeInUp 0.6s 0.3s ease both;
        }

        .btn {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            padding: 0.875rem 2rem;
            font-family: 'Space Grotesk', sans-serif;
            font-weight: 600;
            font-size: 1rem;
            border-radius: 100px;
            cursor: pointer;
            transition: transform var(--transition), box-shadow var(--transition);
            border: none;
            text-decoration: none;
            white-space: nowrap;
        }

        .btn:active {
            transform: scale(0.97);
        }

        .btn-primary {
            background: var(--gradient-brand);
            color: #fff;
            box-shadow: 0 4px 15px rgba(79, 110, 247, 0.3);
        }

        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 25px rgba(79, 110, 247, 0.4);
        }

        .btn-secondary {
            background: rgba(255, 255, 255, 0.05);
            color: var(--text-primary);
            border: 1px solid var(--border-light);
            backdrop-filter: blur(10px);
        }

        .btn-secondary:hover {
            background: rgba(255, 255, 255, 0.08);
            border-color: rgba(255, 255, 255, 0.2);
            transform: translateY(-2px);
        }

        .hero-scroll-indicator {
            position: absolute;
            bottom: 2rem;
            left: 50%;
            transform: translateX(-50%);
            z-index: 1;
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 0.5rem;
            color: var(--text-muted);
            font-size: 0.8125rem;
            animation: bounce 2s ease-in-out infinite;
            cursor: pointer;
        }

        @keyframes bounce {
            0%, 100% { transform: translateX(-50%) translateY(0); }
            50% { transform: translateX(-50%) translateY(-8px); }
        }

        @keyframes fadeInUp {
            from { opacity: 0; transform: translateY(24px); }
            to { opacity: 1; transform: translateY(0); }
        }

        /* ============ About Section ============ */
        .about {
            background: var(--bg-secondary);
            position: relative;
        }

        .about::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 1px;
            background: linear-gradient(90deg, transparent, var(--border-light), transparent);
        }

        .about-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 4rem;
            align-items: center;
        }

        .about-visual {
            position: relative;
        }

        .about-highlights {
            display: grid;
            gap: 1rem;
        }

        .about-card {
            display: flex;
            align-items: center;
            gap: 1.25rem;
            background: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            padding: 1.25rem 1.5rem;
            box-shadow: var(--shadow);
            transition: transform var(--transition-slow), border-color var(--transition-slow), box-shadow var(--transition-slow);
            cursor: default;
        }
        .about-card:hover {
            transform: translateX(6px);
            border-color: var(--border-light);
            box-shadow: var(--shadow-lg);
        }
        .about-card:first-child {
            border-left: 3px solid var(--accent-purple);
        }
        .about-card:nth-child(2) {
            border-left: 3px solid var(--accent-cyan);
        }
        .about-card:nth-child(3) {
            border-left: 3px solid var(--accent-blue);
        }

        .about-card-icon {
            width: 44px;
            height: 44px;
            border-radius: var(--radius);
            display: flex;
            align-items: center;
            justify-content: center;
            flex-shrink: 0;
        }

        .about-card-icon.purple { background: var(--accent-purple-dim); color: var(--accent-purple); }
        .about-card-icon.blue { background: var(--accent-blue-dim); color: var(--accent-blue); }
        .about-card-icon.cyan { background: var(--accent-cyan-dim); color: var(--accent-cyan); }

        .about-card h4 {
            font-size: 1rem;
            margin-bottom: 0.25rem;
        }

        .about-card p {
            font-size: 0.875rem;
            color: var(--text-muted);
        }

        .about-text .section-tag { margin-left: 0; margin-right: auto; }
        .about-text .section-title { text-align: left; margin-bottom: 1.5rem; }

        .about-features {
            display: grid;
            gap: 1rem;
            margin-top: 2rem;
        }

        .about-feature {
            display: flex;
            gap: 0.875rem;
            align-items: flex-start;
        }

        .about-feature-icon {
            width: 32px;
            height: 32px;
            border-radius: 50%;
            background: var(--accent-blue-dim);
            display: flex;
            align-items: center;
            justify-content: center;
            flex-shrink: 0;
            color: var(--accent-blue);
        }

        .about-feature-text h4 {
            font-size: 1rem;
            margin-bottom: 0.25rem;
        }

        .about-feature-text p {
            font-size: 0.9375rem;
        }

        /* ============ Departments Bento Grid ============ */
        .departments {
            position: relative;
        }

        .bento-grid {
            display: grid;
            grid-template-columns: repeat(5, 1fr);
            gap: 1.25rem;
        }

        .bento-card {
            background: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            padding: 2rem;
            cursor: default;
            transition: background var(--transition-slow), border-color var(--transition-slow), transform var(--transition-slow), box-shadow var(--transition-slow);
            position: relative;
            overflow: hidden;
        }

        .bento-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 3px;
            background: linear-gradient(90deg, transparent, var(--card-accent, var(--accent-blue)), transparent);
            opacity: 0;
            transition: opacity var(--transition-slow);
        }

        .bento-card:hover {
            background: var(--bg-card-hover);
            border-color: var(--border-light);
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
        }

        .bento-card:hover::before {
            opacity: 1;
        }

        .bento-card.large {
            grid-column: span 2;
            grid-row: span 2;
        }

        .bento-card.wide {
            grid-column: span 2;
        }

        .bento-icon {
            width: 48px;
            height: 48px;
            border-radius: var(--radius);
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 1.25rem;
            font-size: 1.5rem;
        }

        .bento-icon.research { background: var(--accent-blue-dim); color: var(--accent-blue); }
        .bento-icon.publicity { background: var(--accent-purple-dim); color: var(--accent-purple); }
        .bento-icon.office { background: var(--accent-amber-dim); color: var(--accent-amber); }
        .bento-icon.management { background: var(--accent-cyan-dim); color: var(--accent-cyan); }
        .bento-icon.liaison { background: rgba(236, 72, 153, 0.15); color: #EC4899; }

        .bento-card h3 {
            font-size: 1.25rem;
            margin-bottom: 0.625rem;
        }

        .bento-card p {
            font-size: 0.9375rem;
            color: var(--text-muted);
            margin-bottom: 1.25rem;
        }

        .bento-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 0.5rem;
        }

        .bento-tag {
            font-size: 0.75rem;
            font-weight: 500;
            padding: 0.25rem 0.75rem;
            border-radius: 100px;
            background: rgba(255, 255, 255, 0.04);
            color: var(--text-secondary);
            border: 1px solid var(--border);
        }

        .bento-card.large .bento-icon {
            width: 64px;
            height: 64px;
            font-size: 2rem;
        }

        .bento-card.large h3 {
            font-size: 1.5rem;
        }

        .bento-card.large p {
            font-size: 1rem;
        }

        /* ============ Stats Section ============ */
        .stats {
            background: var(--bg-secondary);
            position: relative;
        }

        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 2rem;
            text-align: center;
        }

        .stat-item {
            padding: 2rem;
        }

        .stat-number {
            font-family: 'Space Grotesk', sans-serif;
            font-size: clamp(2.5rem, 4vw, 3.5rem);
            font-weight: 700;
            letter-spacing: -0.02em;
            background: linear-gradient(135deg, var(--accent-blue), var(--accent-cyan));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            margin-bottom: 0.5rem;
            display: inline-block;
            white-space: nowrap;
        }

        .stat-label {
            color: var(--text-secondary);
            font-size: 1rem;
            font-weight: 500;
        }

        /* ============ Events Section ============ */
        .events-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 1.5rem;
        }

        .event-card {
            background: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            overflow: hidden;
            cursor: default;
            transition: transform var(--transition-slow), border-color var(--transition-slow), box-shadow var(--transition-slow);
        }

        .event-card:hover {
            transform: translateY(-4px);
            border-color: var(--border-light);
            box-shadow: var(--shadow-lg);
        }

        .event-image {
            width: 100%;
            aspect-ratio: 16 / 10;
            background: linear-gradient(135deg, #1E2642 0%, #1A1F35 100%);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 2.5rem;
            position: relative;
            overflow: hidden;
        }

        .event-image::after {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(180deg, transparent 50%, var(--bg-card));
        }

        /* 图片加载成功时的样式 */
        .event-image .event-img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            display: block;
        }

        /* 占位提示层（无图时显示） */
        .event-image .event-img-fallback {
            position: absolute;
            inset: 0;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            gap: 0.5rem;
            color: var(--text-muted);
            opacity: 0.6;
            z-index: 1;
            pointer-events: none;
        }

        .event-image .event-img-fallback svg {
            opacity: 0.5;
        }

        .event-image .event-img-fallback span {
            font-size: 0.75rem;
            font-family: 'Space Grotesk', sans-serif;
            letter-spacing: 0.05em;
        }

        /* 有图片时隐藏占位层 */
        .event-image:not(.no-img) .event-img-fallback {
            display: none;
        }

        /* 有图片时去掉底部渐变遮罩，让照片完整显示 */
        .event-image:not(.no-img)::after {
            display: none;
        }

        .event-body {
            padding: 1.5rem;
        }

        .event-date {
            font-size: 0.8125rem;
            font-weight: 600;
            color: var(--accent-cyan);
            margin-bottom: 0.5rem;
            font-family: 'Space Grotesk', sans-serif;
            letter-spacing: 0.02em;
        }

        .event-body h3 {
            font-size: 1.125rem;
            margin-bottom: 0.5rem;
        }

        .event-body p {
            font-size: 0.875rem;
            color: var(--text-muted);
        }

        .event-tag {
            display: inline-block;
            font-size: 0.75rem;
            padding: 0.25rem 0.75rem;
            border-radius: 100px;
            margin-top: 0.75rem;
            font-weight: 500;
        }

        .event-tag.workshop { background: var(--accent-blue-dim); color: #7E93FF; }
        .event-tag.competition { background: var(--accent-amber-dim); color: var(--accent-amber); }
        .event-tag.talk { background: var(--accent-purple-dim); color: #A78BFA; }
        /* Light mode: darken event tag text for WCAG 4.5:1 contrast on pale tag backgrounds */
        [data-theme="light"] .event-tag.workshop { color: #3B4FD6; }
        [data-theme="light"] .event-tag.competition { color: #92400E; }
        [data-theme="light"] .event-tag.talk { color: #6D28D9; }
        /* Light mode: darken date labels for WCAG 4.5:1 contrast on white cards */
        [data-theme="light"] .event-date { color: #0E7490; }

        /* ============ Join Process ============ */
        .process {
            background: var(--bg-secondary);
            position: relative;
        }

        .process-steps {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 2rem;
            position: relative;
        }

        .process-steps::before {
            content: '';
            position: absolute;
            top: 40px;
            left: 12.5%;
            right: 12.5%;
            height: 2px;
            background: linear-gradient(90deg, var(--accent-blue), var(--accent-purple), var(--accent-cyan), var(--accent-amber));
            z-index: 0;
            opacity: 0.3;
        }

        .process-step {
            text-align: center;
            position: relative;
            z-index: 1;
        }

        .step-number {
            width: 80px;
            height: 80px;
            border-radius: 50%;
            background: var(--bg-card);
            border: 2px solid var(--border);
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 1.5rem;
            font-family: 'Space Grotesk', sans-serif;
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--accent-blue);
            transition: border-color var(--transition-slow), box-shadow var(--transition-slow);
            position: relative;
        }

        .process-step:hover .step-number {
            border-color: var(--accent-blue);
            box-shadow: var(--shadow-glow-blue);
        }

        .process-step h3 {
            font-size: 1.125rem;
            margin-bottom: 0.5rem;
        }

        .process-step p {
            font-size: 0.9375rem;
            color: var(--text-muted);
        }

        /* ============ FAQ Section ============ */
        .faq-list {
            max-width: 720px;
            margin: 0 auto;
            display: grid;
            gap: 1rem;
        }

        .faq-item {
            background: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: var(--radius);
            overflow: hidden;
            transition: border-color var(--transition-slow);
        }

        .faq-item.active {
            border-color: var(--border-light);
        }

        .faq-question {
            width: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 1rem;
            padding: 1.25rem 1.5rem;
            background: none;
            border: none;
            cursor: pointer;
            color: var(--text-primary);
            font-family: 'Space Grotesk', sans-serif;
            font-size: 1rem;
            font-weight: 500;
            text-align: left;
            transition: color var(--transition);
        }

        .faq-question:hover {
            color: var(--accent-blue);
        }

        .faq-icon {
            width: 28px;
            height: 28px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.05);
            display: flex;
            align-items: center;
            justify-content: center;
            flex-shrink: 0;
            transition: transform var(--transition-slow), background var(--transition);
        }

        .faq-item.active .faq-icon {
            transform: rotate(45deg);
            background: var(--accent-blue-dim);
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease, padding 0.35s ease;
        }

        .faq-item.active .faq-answer {
            max-height: var(--answer-height, 500px);
        }

        .faq-answer-inner {
            padding: 0 1.5rem 1.25rem;
            color: var(--text-secondary);
            font-size: 0.9375rem;
            line-height: 1.7;
        }

        /* ============ CTA Banner ============ */
        .cta-banner {
            position: relative;
            overflow: hidden;
        }

        .cta-banner::before {
            content: '';
            position: absolute;
            inset: 0;
            background:
                radial-gradient(ellipse 60% 80% at 30% 50%, rgba(79, 110, 247, 0.1) 0%, transparent 60%),
                radial-gradient(ellipse 60% 80% at 70% 50%, rgba(139, 92, 246, 0.1) 0%, transparent 60%);
        }

        .cta-card {
            position: relative;
            background: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: var(--radius-xl);
            padding: 4rem 2rem;
            text-align: center;
            max-width: 700px;
            margin: 0 auto;
            z-index: 1;
        }

        .cta-card h2 {
            margin-bottom: 1rem;
        }

        .cta-card p {
            margin-bottom: 2rem;
            font-size: 1.125rem;
        }

        /* ============ Footer ============ */
        .footer {
            background: var(--bg-secondary);
            border-top: 1px solid var(--border);
            padding: 3rem 0 1.5rem;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 3rem;
            margin-bottom: 2.5rem;
        }

        .footer-brand p {
            margin-top: 1rem;
            font-size: 0.9375rem;
        }

        .footer h4 {
            font-size: 0.875rem;
            text-transform: uppercase;
            letter-spacing: 0.05em;
            color: var(--text-muted);
            margin-bottom: 1.25rem;
        }

        .footer-links {
            list-style: none;
            display: grid;
            gap: 0.75rem;
        }

        .footer-links a {
            font-size: 0.9375rem;
            color: var(--text-secondary);
            transition: color var(--transition);
            cursor: pointer;
        }

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

        .footer-bottom {
            border-top: 1px solid var(--border);
            padding-top: 1.5rem;
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 1rem;
        }

        .footer-bottom p {
            font-size: 0.875rem;
            color: var(--text-muted);
        }

        .footer-social {
            display: flex;
            gap: 1rem;
        }

        .footer-social a {
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.04);
            border: 1px solid var(--border);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--text-secondary);
            transition: background var(--transition), color var(--transition), border-color var(--transition);
            cursor: pointer;
        }

        .footer-social a:hover {
            background: rgba(255, 255, 255, 0.08);
            color: var(--text-primary);
            border-color: var(--border-light);
        }

        /* ============ Animations ============ */
        /* No-JS fallback: keep reveal content visible when JavaScript is unavailable */
        html.no-js .reveal {
            opacity: 1;
            transform: none;
        }

        .reveal {
            opacity: 0;
            transform: translateY(32px);
            transition: opacity 0.7s ease, transform 0.7s ease;
        }

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

        .reveal-delay-1 { transition-delay: 0.1s; }
        .reveal-delay-2 { transition-delay: 0.2s; }
        .reveal-delay-3 { transition-delay: 0.3s; }
        .reveal-delay-4 { transition-delay: 0.4s; }

        /* ============ Mobile Nav ============ */
        .mobile-nav {
            position: fixed;
            inset: 0;
            z-index: 102;
            background: rgba(10, 14, 26, 0.97);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            gap: 2rem;
            opacity: 0;
            pointer-events: none;
            transition: opacity 0.3s ease;
        }

        .mobile-nav.open {
            opacity: 1;
            pointer-events: all;
        }

        .mobile-nav a {
            font-family: 'Space Grotesk', sans-serif;
            font-size: 1.5rem;
            font-weight: 600;
            color: var(--text-secondary);
            transition: color var(--transition);
            cursor: pointer;
        }

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

        .mobile-nav .nav-cta {
            font-size: 1.125rem;
            padding: 0.875rem 2.5rem;
        }

        /* ============ Back to Top ============ */
        .back-to-top {
            position: fixed;
            bottom: 2rem;
            right: 2rem;
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background: var(--bg-card);
            border: 1px solid var(--border);
            color: var(--text-secondary);
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: center;
            z-index: 50;
            opacity: 0;
            pointer-events: none;
            transition: opacity var(--transition-slow), transform var(--transition), background var(--transition);
        }

        .back-to-top.visible {
            opacity: 1;
            pointer-events: all;
        }

        .back-to-top:hover {
            background: var(--bg-card-hover);
            transform: translateY(-3px);
            color: var(--text-primary);
        }

        /* ============ Reduced Motion ============ */
        @media (prefers-reduced-motion: reduce) {
            *,
            *::before,
            *::after {
                animation-duration: 0.01ms !important;
                animation-iteration-count: 1 !important;
                transition-duration: 0.01ms !important;
            }
            html { scroll-behavior: auto; }
        }

        /* ============ Responsive ============ */
        @media (max-width: 1024px) {
            .bento-grid {
                grid-template-columns: repeat(3, 1fr);
            }
            .bento-card.large,
            .bento-card.wide { grid-column: span 1; }

            .events-grid { grid-template-columns: repeat(2, 1fr); }
            .stats-grid { grid-template-columns: repeat(2, 1fr); }
            .process-steps { grid-template-columns: repeat(2, 1fr); }
            .process-steps::before { display: none; }
            .about-grid { grid-template-columns: 1fr; gap: 2rem; }
            .footer-grid { grid-template-columns: 1fr 1fr; }
        }

        @media (max-width: 768px) {
            .nav-links { display: none; }
            .navbar-inner .nav-cta { display: none; } /* duplicate CTA lives in the mobile menu */
            .hamburger { display: flex; }

            .bento-grid {
                grid-template-columns: repeat(2, 1fr);
            }

            .events-grid { grid-template-columns: 1fr; }
            .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 1rem; }
            .process-steps { grid-template-columns: 1fr; }
            .faq-question { font-size: 0.9375rem; padding: 1rem 1.25rem; }
            .footer-grid { grid-template-columns: 1fr; gap: 2rem; }
            .footer-bottom { flex-direction: column; text-align: center; }
            .cta-card { padding: 3rem 1.5rem; }
            .section { padding: 4rem 0; }
        }

        @media (max-width: 480px) {
            .hero-actions { flex-direction: column; width: 100%; }
            .hero-actions .btn { width: 100%; justify-content: center; }
            .bento-grid { grid-template-columns: 1fr; }
            .stats-grid { grid-template-columns: 1fr 1fr; }
            .back-to-top { bottom: 1rem; right: 1rem; }
        }
        /* ============ Skip to Content ============ */
        .skip-link {
            position: fixed;
            top: -100%;
            left: 1rem;
            z-index: 200;
            padding: 0.75rem 1.5rem;
            background: var(--accent-blue);
            color: #fff;
            font-family: 'Space Grotesk', sans-serif;
            font-weight: 600;
            border-radius: 100px;
            text-decoration: none;
            transition: top 0.2s ease;
        }
        .skip-link:focus {
            top: 1rem;
        }

        /* ============ About Text Overrides ============ */
        .about-text .section-tag {
            margin-left: 0;
            margin-right: auto;
        }
        .about-text .section-title {
            text-align: left;
            margin-bottom: 1.5rem;
        }
        .about-lead {
            font-size: 1.125rem;
            margin-bottom: 1rem;
        }

        /* ============ Event Image Variants ============ */
        .event-image.hackathon { background: linear-gradient(135deg, #1a1a3e 0%, #2d1f5e 50%, #1a1f35 100%); }
        .event-image.techtalk { background: linear-gradient(135deg, #0f2b3e 0%, #1a4a5e 50%, #1a1f35 100%); }
        .event-image.bootcamp { background: linear-gradient(135deg, #1e2a1a 0%, #2d4a1f 50%, #1a1f35 100%); }
        [data-theme="light"] .event-image.hackathon { background: linear-gradient(135deg, #EDE9FE 0%, #DDD6FE 50%, #F1F5F9 100%); }
        [data-theme="light"] .event-image.techtalk { background: linear-gradient(135deg, #E0F2FE 0%, #BAE6FD 50%, #F1F5F9 100%); }
        [data-theme="light"] .event-image.bootcamp { background: linear-gradient(135deg, #DCFCE7 0%, #BBF7D0 50%, #F1F5F9 100%); }

        /* ============ Footer Contact Row ============ */
        .footer-contact-row {
            display: flex;
            align-items: center;
            gap: 0.5rem;
            color: var(--text-muted);
        }

        /* ============ QR Modal ============ */
        .modal-overlay {
            position: fixed;
            inset: 0;
            z-index: 200;
            background: rgba(10, 14, 26, 0.85);
            backdrop-filter: blur(8px);
            -webkit-backdrop-filter: blur(8px);
            display: flex;
            align-items: center;
            justify-content: center;
            padding: 1.5rem;
            opacity: 0;
            pointer-events: none;
            transition: opacity 0.3s ease;
        }
        .modal-overlay.open {
            opacity: 1;
            pointer-events: all;
        }

        .modal-content {
            position: relative;
            background: var(--bg-card);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-xl);
            padding: 3rem 2rem 2.5rem;
            max-width: 640px;
            width: 100%;
            max-height: 90vh;
            max-height: 90dvh;
            overflow-y: auto;
            text-align: center;
            box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5), var(--shadow-glow-blue);
            transform: translateY(20px);
            transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1);
        }
        .modal-overlay.open .modal-content {
            transform: translateY(0);
        }

        .modal-content .section-tag {
            display: inline-flex;
        }

        .modal-close {
            position: sticky;
            float: right;
            top: 0;
            z-index: 10;
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: var(--bg-card);
            border: 1px solid var(--border);
            color: var(--text-secondary);
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: center;
            transition: background var(--transition), color var(--transition);
        }
        .modal-close:hover {
            background: rgba(255, 255, 255, 0.08);
            color: var(--text-primary);
        }

        /* ============ QR Zoom Lightbox ============ */
        .qr-zoom-overlay {
            position: fixed;
            inset: 0;
            z-index: 300; /* 位于报名弹窗(200)之上 */
            background: rgba(10, 14, 26, 0.92);
            backdrop-filter: blur(8px);
            -webkit-backdrop-filter: blur(8px);
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            gap: 1rem;
            padding: 1.5rem;
            opacity: 0;
            pointer-events: none;
            transition: opacity 0.3s ease;
        }
        .qr-zoom-overlay.open {
            opacity: 1;
            pointer-events: all;
        }

        .qr-zoom-img {
            width: auto;
            height: auto;
            max-width: min(85vw, 78vh);
            max-height: min(85vw, 78vh);
            object-fit: contain;
            background: #fff; /* 白底保证扫码静区 */
            padding: 1rem;
            border-radius: var(--radius);
            box-shadow: var(--shadow-lg);
        }

        .qr-zoom-close {
            position: absolute;
            top: 1.5rem;
            right: 1.5rem;
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.08);
            border: 1px solid rgba(255, 255, 255, 0.2);
            color: #fff;
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            transition: background 0.2s ease, transform 0.2s ease;
        }
        .qr-zoom-close:hover {
            background: rgba(255, 255, 255, 0.16);
            transform: scale(1.05);
        }

        .qr-zoom-hint {
            font-size: 0.8125rem;
            color: rgba(255, 255, 255, 0.55);
            letter-spacing: 0.03em;
        }

        /* 可放大的二维码图片提示 */
        .qr-placeholder.has-image img {
            cursor: zoom-in;
            user-select: none;
            -webkit-user-select: none;
        }

        .modal-title {
            margin: 0.75rem 0 0.5rem;
            font-size: 1.75rem;
        }

        .modal-desc {
            color: var(--text-secondary);
            margin-bottom: 2rem;
        }

        .qr-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 1.5rem;
            margin-bottom: 2rem;
        }

        .qr-card {
            background: var(--bg-secondary);
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            padding: 1.5rem;
            text-align: center;
            transition: border-color var(--transition-slow);
        }
        .qr-card:hover {
            border-color: var(--border-light);
        }

        .qr-placeholder {
            aspect-ratio: 1;
            max-width: 200px;
            margin: 0 auto 1rem;
            background: var(--bg-card);
            border: 2px dashed var(--border-light);
            border-radius: var(--radius);
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            gap: 0.5rem;
            color: var(--text-muted);
            font-family: 'Space Grotesk', sans-serif;
            font-size: 0.8125rem;
            font-weight: 500;
            transition: border-color var(--transition);
        }
        .qr-card:hover .qr-placeholder {
            border-color: var(--accent-blue);
        }
        .qr-placeholder small {
            font-size: 0.6875rem;
            opacity: 0.5;
        }
        /* 已加载图片的占位框：虚线变实线，填充图片 */
        .qr-placeholder.has-image {
            border-style: solid;
            border-color: var(--border-light);
            padding: 8px;
            background: #fff;
        }
        .qr-placeholder.has-image img {
            width: 100%;
            height: 100%;
            object-fit: contain;
            display: block;
        }
        .qr-placeholder.has-image > :not(img) {
            display: none;
        }

        .qr-card h4 {
            font-size: 1.0625rem;
            margin-bottom: 0.375rem;
        }
        .qr-card p {
            font-size: 0.8125rem;
            color: var(--text-muted);
        }

        .modal-footer-text {
            font-size: 0.8125rem;
            color: var(--text-muted);
            margin: 0;
        }

        @media (max-width: 600px) {
            .qr-grid {
                grid-template-columns: 1fr;
            }
            .modal-content {
                padding: 1.25rem 1rem 1.5rem;
                max-height: 85vh;
                max-height: 85dvh;
            }
            .modal-close {
                width: 44px;
                height: 44px;
                top: -0.5rem;
            }
        }