/* roulang page: index */
:root {
            --brand: #2563eb;
            --brand-dark: #1e40af;
            --energy: #ea580c;
            --energy-light: #fb923c;
            --bg-light: #f8fafc;
            --bg-card: #ffffff;
            --text-dark: #0f172a;
            --text-muted: #64748b;
            --border-light: #e2e8f0;
            --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
            --shadow-md: 0 4px 20px rgba(0,0,0,0.08);
            --shadow-lg: 0 12px 40px rgba(0,0,0,0.12);
            --radius: 16px;
            --radius-sm: 10px;
            --radius-xs: 6px;
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }
        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
            line-height: 1.6;
            color: var(--text-dark);
            background: #ffffff;
            -webkit-font-smoothing: antialiased;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        a {
            color: inherit;
            text-decoration: none;
            transition: var(--transition);
        }
        button {
            cursor: pointer;
            font-family: inherit;
            transition: var(--transition);
        }
        input, textarea {
            font-family: inherit;
            transition: var(--transition);
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }
        @media (max-width: 768px) {
            .container {
                padding: 0 16px;
            }
        }

        /* Header & Nav */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 50;
            background: rgba(255,255,255,0.96);
            backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--border-light);
            box-shadow: 0 1px 4px rgba(0,0,0,0.04);
        }
        .nav-link {
            position: relative;
            font-weight: 500;
            font-size: 0.95rem;
            padding: 0.5rem 0.25rem;
            color: var(--text-muted);
            transition: var(--transition);
        }
        .nav-link::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--brand);
            border-radius: 2px;
            transition: var(--transition);
        }
        .nav-link:hover {
            color: var(--brand);
        }
        .nav-link:hover::after {
            width: 100%;
        }
        .nav-link.active {
            color: var(--brand);
        }
        .nav-link.active::after {
            width: 100%;
        }

        /* Hero */
        .hero-section {
            background: linear-gradient(135deg, #0f172a 0%, #1e3a8a 40%, #1e40af 70%, #0f172a 100%);
            position: relative;
            overflow: hidden;
            min-height: 92vh;
            display: flex;
            align-items: center;
        }
        .hero-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
            opacity: 0.25;
            mix-blend-mode: overlay;
            animation: heroZoom 20s ease-in-out infinite alternate;
        }
        @keyframes heroZoom {
            0% { transform: scale(1); }
            100% { transform: scale(1.08); }
        }
        .hero-overlay {
            position: absolute;
            inset: 0;
            background: radial-gradient(ellipse at 30% 50%, rgba(37,99,235,0.25) 0%, transparent 70%),
                        radial-gradient(ellipse at 70% 50%, rgba(234,88,12,0.15) 0%, transparent 60%);
        }
        .hero-content {
            position: relative;
            z-index: 2;
        }
        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(255,255,255,0.12);
            backdrop-filter: blur(8px);
            border: 1px solid rgba(255,255,255,0.18);
            border-radius: 9999px;
            padding: 6px 18px 6px 10px;
            font-size: 0.85rem;
            color: rgba(255,255,255,0.9);
            letter-spacing: 0.3px;
        }
        .hero-badge i {
            color: var(--energy-light);
        }

        /* Buttons */
        .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: var(--brand);
            color: #fff;
            font-weight: 600;
            padding: 14px 32px;
            border-radius: 9999px;
            border: none;
            box-shadow: 0 4px 16px rgba(37,99,235,0.35);
            transition: var(--transition);
        }
        .btn-primary:hover {
            background: var(--brand-dark);
            box-shadow: 0 8px 28px rgba(37,99,235,0.45);
            transform: translateY(-2px);
        }
        .btn-primary:active {
            transform: translateY(0);
            box-shadow: 0 2px 8px rgba(37,99,235,0.3);
        }
        .btn-outline-light {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: transparent;
            color: #fff;
            font-weight: 600;
            padding: 13px 30px;
            border-radius: 9999px;
            border: 2px solid rgba(255,255,255,0.35);
            transition: var(--transition);
        }
        .btn-outline-light:hover {
            background: rgba(255,255,255,0.12);
            border-color: rgba(255,255,255,0.6);
            transform: translateY(-2px);
        }
        .btn-outline-light:active {
            transform: translateY(0);
        }
        .btn-secondary {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: var(--energy);
            color: #fff;
            font-weight: 600;
            padding: 14px 32px;
            border-radius: 9999px;
            border: none;
            box-shadow: 0 4px 16px rgba(234,88,12,0.3);
            transition: var(--transition);
        }
        .btn-secondary:hover {
            background: #c2410c;
            box-shadow: 0 8px 28px rgba(234,88,12,0.4);
            transform: translateY(-2px);
        }
        .btn-secondary:active {
            transform: translateY(0);
        }

        /* Cards */
        .card-base {
            background: var(--bg-card);
            border-radius: var(--radius);
            border: 1px solid var(--border-light);
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
        }
        .card-base:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-4px);
        }
        .card-img-top {
            border-radius: var(--radius) var(--radius) 0 0;
            width: 100%;
            height: 220px;
            object-fit: cover;
        }
        .service-card {
            background: var(--bg-card);
            border-radius: var(--radius);
            border: 1px solid var(--border-light);
            box-shadow: var(--shadow-sm);
            padding: 32px 24px;
            text-align: center;
            transition: var(--transition);
        }
        .service-card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-6px);
            border-color: var(--brand);
        }
        .service-icon {
            width: 64px;
            height: 64px;
            border-radius: 16px;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 18px;
            font-size: 1.8rem;
            color: #fff;
            background: var(--brand);
            transition: var(--transition);
        }
        .service-card:hover .service-icon {
            transform: scale(1.08) rotate(-4deg);
        }

        /* Stat */
        .stat-item {
            text-align: center;
            padding: 24px 16px;
        }
        .stat-number {
            font-size: 2.8rem;
            font-weight: 800;
            line-height: 1.2;
            background: linear-gradient(135deg, var(--brand), var(--energy));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .stat-label {
            font-size: 1rem;
            color: var(--text-muted);
            font-weight: 500;
            margin-top: 6px;
        }

        /* Tags */
        .tag {
            display: inline-flex;
            align-items: center;
            gap: 4px;
            background: var(--bg-light);
            color: var(--text-muted);
            font-size: 0.8rem;
            font-weight: 500;
            padding: 4px 12px;
            border-radius: 9999px;
            border: 1px solid var(--border-light);
            transition: var(--transition);
        }
        .tag-brand {
            background: rgba(37,99,235,0.08);
            color: var(--brand);
            border-color: rgba(37,99,235,0.15);
        }
        .tag-energy {
            background: rgba(234,88,12,0.08);
            color: var(--energy);
            border-color: rgba(234,88,12,0.15);
        }

        /* FAQ */
        .faq-item {
            border-bottom: 1px solid var(--border-light);
            padding: 20px 0;
        }
        .faq-question {
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-weight: 600;
            font-size: 1.05rem;
            cursor: pointer;
            padding: 4px 0;
            transition: var(--transition);
        }
        .faq-question:hover {
            color: var(--brand);
        }
        .faq-question i {
            font-size: 1.1rem;
            color: var(--text-muted);
            transition: var(--transition);
        }
        .faq-question.open i {
            transform: rotate(180deg);
            color: var(--brand);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.3s ease;
            color: var(--text-muted);
            line-height: 1.7;
        }
        .faq-answer.open {
            max-height: 400px;
            padding-top: 12px;
        }

        /* CTA */
        .cta-section {
            background: linear-gradient(135deg, #1e3a8a 0%, #1e40af 50%, #172554 100%);
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-2.png') center center / cover no-repeat;
            opacity: 0.12;
            mix-blend-mode: overlay;
        }

        /* Footer */
        .site-footer {
            background: #0f172a;
            color: rgba(255,255,255,0.7);
            border-top: 1px solid rgba(255,255,255,0.06);
        }
        .site-footer a {
            color: rgba(255,255,255,0.6);
            transition: var(--transition);
        }
        .site-footer a:hover {
            color: #fff;
        }
        .footer-links li {
            margin-bottom: 8px;
        }

        /* Breadcrumb */
        .breadcrumb {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 8px;
            font-size: 0.9rem;
            color: var(--text-muted);
            padding: 16px 0;
        }
        .breadcrumb a {
            color: var(--text-muted);
        }
        .breadcrumb a:hover {
            color: var(--brand);
        }
        .breadcrumb span {
            color: var(--text-dark);
        }
        .breadcrumb i {
            font-size: 0.7rem;
            color: #94a3b8;
        }

        /* Process */
        .process-step {
            position: relative;
            padding-left: 48px;
            padding-bottom: 40px;
        }
        .process-step::before {
            content: '';
            position: absolute;
            left: 18px;
            top: 40px;
            bottom: 0;
            width: 2px;
            background: var(--border-light);
        }
        .process-step:last-child::before {
            display: none;
        }
        .process-step .step-num {
            position: absolute;
            left: 0;
            top: 0;
            width: 38px;
            height: 38px;
            border-radius: 50%;
            background: var(--brand);
            color: #fff;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 0.95rem;
            box-shadow: 0 4px 12px rgba(37,99,235,0.3);
        }

        /* Section spacing */
        .section-pad {
            padding: 80px 0;
        }
        @media (max-width: 768px) {
            .section-pad {
                padding: 48px 0;
            }
        }
        .section-title {
            font-size: 2.2rem;
            font-weight: 800;
            line-height: 1.25;
            letter-spacing: -0.02em;
            color: var(--text-dark);
        }
        .section-subtitle {
            font-size: 1.1rem;
            color: var(--text-muted);
            max-width: 600px;
            margin: 12px auto 0;
        }
        @media (max-width: 768px) {
            .section-title {
                font-size: 1.7rem;
            }
            .section-subtitle {
                font-size: 1rem;
            }
        }

        /* Responsive nav */
        .mobile-menu {
            display: none;
        }
        @media (max-width: 768px) {
            .desktop-nav {
                display: none !important;
            }
            .mobile-menu {
                display: flex;
            }
            .mobile-drawer {
                position: fixed;
                top: 64px;
                left: 0;
                right: 0;
                background: rgba(255,255,255,0.98);
                backdrop-filter: blur(16px);
                border-bottom: 1px solid var(--border-light);
                padding: 16px 24px 24px;
                box-shadow: var(--shadow-lg);
                transform: translateY(-120%);
                opacity: 0;
                transition: var(--transition);
                z-index: 40;
            }
            .mobile-drawer.open {
                transform: translateY(0);
                opacity: 1;
            }
            .mobile-drawer a {
                display: block;
                padding: 12px 0;
                font-weight: 500;
                border-bottom: 1px solid var(--border-light);
            }
            .mobile-drawer a:last-child {
                border-bottom: none;
            }
        }

        /* Misc */
        .ranking-list li {
            display: flex;
            align-items: center;
            gap: 14px;
            padding: 14px 18px;
            border-bottom: 1px solid var(--border-light);
            transition: var(--transition);
        }
        .ranking-list li:hover {
            background: var(--bg-light);
        }
        .ranking-list .rank {
            width: 32px;
            height: 32px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 0.85rem;
            background: var(--bg-light);
            color: var(--text-muted);
            flex-shrink: 0;
        }
        .ranking-list .rank.top {
            background: var(--energy);
            color: #fff;
        }
        .img-rad {
            border-radius: var(--radius);
        }
        .img-rad-sm {
            border-radius: var(--radius-sm);
        }
        .shadow-card {
            box-shadow: var(--shadow-md);
        }
        .border-section {
            border-top: 1px solid var(--border-light);
        }
        .grid-gap {
            gap: 28px;
        }
        @media (max-width: 768px) {
            .grid-gap {
                gap: 20px;
            }
        }

        /* Focus & accessibility */
        a:focus-visible, button:focus-visible, input:focus-visible {
            outline: 2px solid var(--brand);
            outline-offset: 2px;
            border-radius: var(--radius-xs);
        }

        /* Dark overlay for images */
        .img-overlay-dark {
            position: relative;
        }
        .img-overlay-dark::after {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(to top, rgba(0,0,0,0.5) 0%, transparent 60%);
            border-radius: var(--radius);
        }

        /* Skeleton for empty state */
        .empty-state {
            text-align: center;
            padding: 48px 24px;
            color: var(--text-muted);
        }
        .empty-state i {
            font-size: 3rem;
            color: #cbd5e1;
            margin-bottom: 16px;
        }

/* roulang page: article */
:root {
            --brand-50: #f0f7ff; --brand-100: #e0effe; --brand-200: #b9dffd; --brand-300: #7cc5fb;
            --brand-400: #36a9f6; --brand-500: #0c8ee8; --brand-600: #0070c5; --brand-700: #0159a0;
            --brand-800: #064c84; --brand-900: #0b406d; --brand-950: #07284a;
            --energy-400: #ff9d36; --energy-500: #ff7f0f; --energy-600: #f06406;
            --surface: #f8fafc; --radius: 0.75rem; --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
            --shadow: 0 4px 12px rgba(0,0,0,0.06); --shadow-lg: 0 12px 40px rgba(0,0,0,0.08);
        }
        * { box-sizing: border-box; margin: 0; padding: 0; }
        body { font-family: 'Inter', 'Noto Sans SC', system-ui, -apple-system, sans-serif; background: #ffffff; color: #1e293b; line-height: 1.7; -webkit-font-smoothing: antialiased; }
        .container { max-width: 1200px; margin: 0 auto; padding: 0 1.25rem; }
        .section-pad { padding: 4.5rem 0; }
        @media (max-width: 768px) { .section-pad { padding: 3rem 0; } }
        @media (max-width: 520px) { .section-pad { padding: 2.5rem 0; } }
        a { transition: all 0.2s ease; color: var(--brand-600); text-decoration: none; }
        a:hover { color: var(--brand-700); }
        img { max-width: 100%; height: auto; display: block; }
        .btn-primary { display: inline-flex; align-items: center; gap: 0.5rem; background: linear-gradient(135deg, var(--brand-600), var(--brand-700)); color: #fff; font-weight: 600; padding: 0.75rem 1.75rem; border-radius: 9999px; border: none; cursor: pointer; transition: all 0.3s ease; box-shadow: 0 4px 14px rgba(0,112,197,0.3); }
        .btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 25px rgba(0,112,197,0.4); background: linear-gradient(135deg, var(--brand-500), var(--brand-600)); color: #fff; }
        .btn-primary:active { transform: translateY(0); box-shadow: 0 2px 8px rgba(0,112,197,0.3); }
        .btn-outline { display: inline-flex; align-items: center; gap: 0.5rem; border: 2px solid var(--brand-600); color: var(--brand-600); font-weight: 600; padding: 0.65rem 1.65rem; border-radius: 9999px; background: transparent; transition: all 0.3s ease; }
        .btn-outline:hover { background: var(--brand-600); color: #fff; transform: translateY(-1px); }
        .badge { display: inline-block; padding: 0.2rem 0.85rem; border-radius: 9999px; font-size: 0.75rem; font-weight: 600; letter-spacing: 0.02em; background: var(--brand-100); color: var(--brand-700); }
        .badge-energy { background: #fff3e0; color: #c74a07; }
        .section-title { font-size: 2rem; font-weight: 800; line-height: 1.25; color: #0f172a; letter-spacing: -0.02em; }
        .section-sub { font-size: 1.05rem; color: #64748b; max-width: 640px; line-height: 1.7; }
        @media (max-width: 768px) { .section-title { font-size: 1.6rem; } }
        .glass-card { background: rgba(255,255,255,0.85); backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px); border: 1px solid rgba(255,255,255,0.3); border-radius: var(--radius); box-shadow: var(--shadow); transition: all 0.3s ease; }
        .glass-card:hover { box-shadow: var(--shadow-lg); transform: translateY(-3px); }
        .content-card { background: #fff; border-radius: var(--radius); box-shadow: var(--shadow); border: 1px solid #f1f5f9; transition: all 0.3s ease; overflow: hidden; }
        .content-card:hover { box-shadow: var(--shadow-lg); transform: translateY(-4px); }
        .nav-link { position: relative; font-size: 0.95rem; font-weight: 500; color: #475569; padding: 0.25rem 0; transition: color 0.2s; }
        .nav-link::after { content: ''; position: absolute; bottom: -2px; left: 0; width: 0; height: 2px; background: var(--brand-600); border-radius: 2px; transition: width 0.3s ease; }
        .nav-link:hover { color: var(--brand-600); }
        .nav-link:hover::after { width: 100%; }
        .nav-link.active { color: var(--brand-600); font-weight: 600; }
        .nav-link.active::after { width: 100%; }
        .mobile-drawer { position: fixed; top: 0; right: -100%; width: 280px; height: 100vh; background: #fff; box-shadow: -8px 0 40px rgba(0,0,0,0.1); padding: 2rem 1.5rem; z-index: 1000; transition: right 0.4s cubic-bezier(0.22, 1, 0.36, 1); overflow-y: auto; }
        .mobile-drawer.open { right: 0; }
        .mobile-drawer a { display: block; padding: 0.75rem 0; font-size: 1rem; font-weight: 500; color: #334155; border-bottom: 1px solid #f1f5f9; }
        .mobile-drawer a:hover { color: var(--brand-600); }
        .mobile-drawer-overlay { position: fixed; inset: 0; background: rgba(0,0,0,0.4); backdrop-filter: blur(4px); z-index: 999; opacity: 0; pointer-events: none; transition: opacity 0.35s ease; }
        .mobile-drawer-overlay.open { opacity: 1; pointer-events: auto; }
        .footer-links a { color: #94a3b8; transition: color 0.2s; }
        .footer-links a:hover { color: #fff; }
        .site-footer { background: #0f172a; color: #cbd5e1; }
        .article-content h2 { font-size: 1.5rem; font-weight: 700; margin-top: 2.5rem; margin-bottom: 1rem; color: #0f172a; }
        .article-content h3 { font-size: 1.2rem; font-weight: 600; margin-top: 1.8rem; margin-bottom: 0.75rem; color: #1e293b; }
        .article-content p { margin-bottom: 1.2rem; color: #334155; line-height: 1.8; }
        .article-content ul, .article-content ol { margin-bottom: 1.2rem; padding-left: 1.5rem; color: #334155; }
        .article-content li { margin-bottom: 0.4rem; }
        .article-content img { border-radius: var(--radius); margin: 1.5rem 0; box-shadow: var(--shadow); }
        .article-content blockquote { border-left: 4px solid var(--brand-600); padding: 0.75rem 1.25rem; margin: 1.5rem 0; background: var(--brand-50); border-radius: 0 var(--radius) var(--radius) 0; color: #334155; font-style: italic; }
        .article-content a { color: var(--brand-600); text-decoration: underline; text-underline-offset: 2px; }
        .article-content a:hover { color: var(--brand-700); }
        @media (max-width: 768px) { .article-content h2 { font-size: 1.3rem; } }
        .tag { display: inline-block; padding: 0.25rem 0.75rem; border-radius: 9999px; font-size: 0.8rem; font-weight: 500; background: #f1f5f9; color: #475569; transition: all 0.2s; }
        .tag:hover { background: var(--brand-100); color: var(--brand-700); }
        .breadcrumb { display: flex; align-items: center; gap: 0.5rem; font-size: 0.9rem; color: #94a3b8; }
        .breadcrumb a { color: #64748b; }
        .breadcrumb a:hover { color: var(--brand-600); }
        .breadcrumb .sep { color: #cbd5e1; }
        .hero-article-bg { background: linear-gradient(135deg, #f0f7ff 0%, #e0effe 50%, #f8fafc 100%); position: relative; overflow: hidden; }
        .hero-article-bg::before { content: ''; position: absolute; top: -50%; right: -20%; width: 60%; height: 120%; background: radial-gradient(ellipse at center, rgba(0,112,197,0.06) 0%, transparent 70%); pointer-events: none; }
        .hero-article-bg::after { content: ''; position: absolute; bottom: -30%; left: -10%; width: 50%; height: 80%; background: radial-gradient(ellipse at center, rgba(255,125,15,0.05) 0%, transparent 70%); pointer-events: none; }
        @media (max-width: 520px) { .container { padding: 0 1rem; } }
        .animate-fade-up { opacity: 0; transform: translateY(20px); animation: fadeUp 0.6s ease forwards; }
        @keyframes fadeUp { to { opacity: 1; transform: translateY(0); } }
        .delay-1 { animation-delay: 0.1s; }
        .delay-2 { animation-delay: 0.2s; }
        .delay-3 { animation-delay: 0.3s; }

/* roulang page: category1 */
:root {
            --brand: #2563eb;
            --brand-dark: #1d4ed8;
            --energy: #f97316;
            --bg-body: #fafbfc;
            --text-body: #1e293b;
            --text-muted: #64748b;
            --border-light: #e2e8f0;
            --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.06);
            --shadow-hover: 0 12px 40px rgba(0, 0, 0, 0.10);
            --radius: 0.75rem;
        }
        *,
        *::before,
        *::after {
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            margin: 0;
            font-family: 'Inter', 'Noto Sans SC', system-ui, -apple-system, sans-serif;
            background: var(--bg-body);
            color: var(--text-body);
            line-height: 1.6;
            -webkit-font-smoothing: antialiased;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        a {
            transition: color 0.2s ease;
        }
        .container {
            max-width: 1200px;
            margin-left: auto;
            margin-right: auto;
            padding-left: 1.25rem;
            padding-right: 1.25rem;
        }
        @media (min-width: 768px) {
            .container {
                padding-left: 2rem;
                padding-right: 2rem;
            }
        }
        .section-pad {
            padding-top: 5rem;
            padding-bottom: 5rem;
        }
        @media (max-width: 767px) {
            .section-pad {
                padding-top: 3rem;
                padding-bottom: 3rem;
            }
        }
        .section-title {
            font-size: 1.875rem;
            font-weight: 800;
            letter-spacing: -0.025em;
            line-height: 1.25;
        }
        @media (min-width: 768px) {
            .section-title {
                font-size: 2.25rem;
            }
        }
        .section-subtitle {
            font-size: 1.05rem;
            color: var(--text-muted);
            max-width: 640px;
            margin-left: auto;
            margin-right: auto;
            line-height: 1.7;
        }
        .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            background: var(--brand);
            color: #fff;
            font-weight: 600;
            padding: 0.75rem 1.75rem;
            border-radius: 9999px;
            border: none;
            cursor: pointer;
            transition: background 0.25s ease, transform 0.2s ease, box-shadow 0.25s ease;
            box-shadow: 0 4px 14px rgba(37, 99, 235, 0.30);
            text-decoration: none;
        }
        .btn-primary:hover {
            background: var(--brand-dark);
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(37, 99, 235, 0.35);
        }
        .btn-primary:active {
            transform: translateY(0);
            box-shadow: 0 2px 8px rgba(37, 99, 235, 0.25);
        }
        .btn-primary:focus-visible {
            outline: 2px solid var(--brand);
            outline-offset: 2px;
        }
        .btn-outline {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            background: transparent;
            color: var(--brand);
            font-weight: 600;
            padding: 0.65rem 1.5rem;
            border-radius: 9999px;
            border: 2px solid var(--brand);
            cursor: pointer;
            transition: background 0.25s ease, color 0.25s ease, transform 0.2s ease;
            text-decoration: none;
        }
        .btn-outline:hover {
            background: var(--brand);
            color: #fff;
            transform: translateY(-2px);
        }
        .btn-outline:active {
            transform: translateY(0);
        }
        .btn-outline:focus-visible {
            outline: 2px solid var(--brand);
            outline-offset: 2px;
        }
        .card {
            background: #fff;
            border-radius: var(--radius);
            box-shadow: var(--shadow-card);
            border: 1px solid var(--border-light);
            transition: box-shadow 0.3s ease, transform 0.3s ease;
        }
        .card:hover {
            box-shadow: var(--shadow-hover);
            transform: translateY(-4px);
        }
        .badge {
            display: inline-block;
            font-size: 0.75rem;
            font-weight: 600;
            padding: 0.2rem 0.75rem;
            border-radius: 9999px;
            letter-spacing: 0.02em;
        }
        .badge-brand {
            background: #dbeafe;
            color: #1d4ed8;
        }
        .badge-energy {
            background: #ffedd5;
            color: #ea580c;
        }
        .badge-green {
            background: #d1fae5;
            color: #059669;
        }
        .nav-link {
            position: relative;
            font-size: 0.95rem;
            font-weight: 500;
            color: #475569;
            padding: 0.25rem 0;
            text-decoration: none;
            transition: color 0.2s ease;
        }
        .nav-link::after {
            content: '';
            position: absolute;
            left: 0;
            bottom: -2px;
            width: 0;
            height: 2px;
            background: var(--brand);
            border-radius: 2px;
            transition: width 0.3s ease;
        }
        .nav-link:hover {
            color: var(--brand);
        }
        .nav-link:hover::after {
            width: 100%;
        }
        .nav-link.active {
            color: var(--brand);
            font-weight: 600;
        }
        .nav-link.active::after {
            width: 100%;
        }
        .site-header {
            position: sticky;
            top: 0;
            z-index: 50;
            background: rgba(255, 255, 255, 0.96);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-bottom: 1px solid rgba(226, 232, 240, 0.7);
            box-shadow: 0 1px 4px rgba(0, 0, 0, 0.02);
        }
        .mobile-drawer {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(255, 255, 255, 0.98);
            backdrop-filter: blur(8px);
            -webkit-backdrop-filter: blur(8px);
            flex-direction: column;
            padding: 5rem 2rem 2rem;
            z-index: 60;
            gap: 1.25rem;
            font-size: 1.15rem;
            font-weight: 500;
            overflow-y: auto;
        }
        .mobile-drawer.open {
            display: flex;
        }
        .mobile-drawer a {
            text-decoration: none;
            color: #1e293b;
            padding: 0.5rem 0;
            border-bottom: 1px solid #f1f5f9;
        }
        .mobile-drawer a.active {
            color: var(--brand);
            font-weight: 600;
        }
        .mobile-drawer .close-btn {
            position: absolute;
            top: 1.25rem;
            right: 1.5rem;
            font-size: 1.5rem;
            color: #64748b;
            cursor: pointer;
            background: none;
            border: none;
            padding: 0.5rem;
        }
        .footer-links a {
            color: #94a3b8;
            text-decoration: none;
            transition: color 0.2s ease;
        }
        .footer-links a:hover {
            color: #fff;
        }
        .hero-section {
            position: relative;
            min-height: 60vh;
            display: flex;
            align-items: center;
            justify-content: center;
            text-align: center;
            background-size: cover;
            background-position: center;
            background-repeat: no-repeat;
        }
        .hero-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(0, 0, 0, 0.70) 0%, rgba(0, 0, 0, 0.30) 100%);
            z-index: 1;
        }
        .hero-section>* {
            position: relative;
            z-index: 2;
        }
        .stat-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 1.5rem;
        }
        @media (min-width: 768px) {
            .stat-grid {
                grid-template-columns: repeat(4, 1fr);
                gap: 2rem;
            }
        }
        .faq-item {
            border-bottom: 1px solid var(--border-light);
            padding: 1.25rem 0;
        }
        .faq-item summary {
            font-weight: 600;
            font-size: 1.05rem;
            cursor: pointer;
            padding: 0.25rem 0;
            list-style: none;
            display: flex;
            align-items: center;
            justify-content: space-between;
            color: #1e293b;
        }
        .faq-item summary::-webkit-details-marker {
            display: none;
        }
        .faq-item summary::after {
            content: '\f078';
            font-family: 'Font Awesome 6 Free';
            font-weight: 900;
            font-size: 0.85rem;
            color: #94a3b8;
            transition: transform 0.3s ease;
        }
        .faq-item[open] summary::after {
            transform: rotate(180deg);
        }
        .faq-item .answer {
            margin-top: 0.75rem;
            color: #64748b;
            line-height: 1.7;
            padding-right: 2rem;
        }
        .filter-tag {
            display: inline-block;
            padding: 0.4rem 1.2rem;
            border-radius: 9999px;
            font-size: 0.9rem;
            font-weight: 500;
            background: #fff;
            border: 1.5px solid var(--border-light);
            color: #475569;
            cursor: pointer;
            transition: all 0.25s ease;
            text-decoration: none;
        }
        .filter-tag:hover {
            border-color: var(--brand);
            color: var(--brand);
        }
        .filter-tag.active {
            background: var(--brand);
            border-color: var(--brand);
            color: #fff;
        }
        .event-card {
            display: flex;
            flex-direction: column;
            background: #fff;
            border-radius: var(--radius);
            overflow: hidden;
            box-shadow: var(--shadow-card);
            border: 1px solid var(--border-light);
            transition: box-shadow 0.3s ease, transform 0.3s ease;
        }
        .event-card:hover {
            box-shadow: var(--shadow-hover);
            transform: translateY(-4px);
        }
        .event-card .cover {
            height: 200px;
            background-size: cover;
            background-position: center;
            background-repeat: no-repeat;
            position: relative;
        }
        .event-card .cover .overlay {
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: linear-gradient(0deg, rgba(0, 0, 0, 0.25) 0%, transparent 60%);
        }
        .event-card .body {
            padding: 1.25rem;
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        @media (max-width: 639px) {
            .event-card .cover {
                height: 160px;
            }
            .section-title {
                font-size: 1.5rem;
            }
            .hero-section {
                min-height: 50vh;
            }
        }
        .step-line {
            position: relative;
            padding-left: 2.5rem;
        }
        .step-line::before {
            content: '';
            position: absolute;
            left: 0.75rem;
            top: 0.5rem;
            bottom: -0.5rem;
            width: 2px;
            background: #dbeafe;
        }
        .step-line:last-child::before {
            display: none;
        }
        .step-dot {
            position: absolute;
            left: 0;
            top: 0.25rem;
            width: 1.5rem;
            height: 1.5rem;
            border-radius: 50%;
            background: var(--brand);
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-size: 0.75rem;
            font-weight: 700;
            z-index: 2;
        }
        .glow-brand {
            box-shadow: 0 0 30px rgba(37, 99, 235, 0.15);
        }
        @media (max-width: 1023px) {
            .desktop-nav {
                display: none !important;
            }
            .mobile-menu {
                display: flex !important;
            }
            .site-header .container .flex .mobile-menu {
                display: flex;
            }
        }
        @media (min-width: 1024px) {
            .mobile-menu {
                display: none !important;
            }
            .desktop-nav {
                display: flex !important;
            }
        }
        .desktop-nav {
            display: flex;
            align-items: center;
            gap: 2rem;
        }
        .mobile-menu {
            display: none;
            align-items: center;
            gap: 0.75rem;
        }
        .site-footer {
            background: #0f172a;
            color: #cbd5e1;
        }
        .site-footer a {
            color: #94a3b8;
            text-decoration: none;
        }
        .site-footer a:hover {
            color: #fff;
        }