/* roulang page: index */
:root {
            --bg-base: #0a0e17;
            --bg-surface: rgba(16, 24, 40, 0.72);
            --bg-card: rgba(23, 37, 65, 0.52);
            --border-glass: rgba(56, 189, 248, 0.22);
            --primary-neon: #00f2fe;
            --secondary-glow: #4facfe;
            --accent-cyber: #38bdf8;
            --text-main: #f8fafc;
            --text-muted: #94a3b8;
        }
        * { box-sizing: border-box; }
        body {
            background-color: var(--bg-base);
            color: var(--text-main);
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
            background-image: 
                radial-gradient(circle at 15% 20%, rgba(0, 242, 254, 0.08) 0%, transparent 40%),
                radial-gradient(circle at 85% 65%, rgba(79, 172, 254, 0.06) 0%, transparent 45%),
                linear-gradient(rgba(255, 255, 255, 0.02) 1px, transparent 1px),
                linear-gradient(90deg, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
            background-size: 100% 100%, 100% 100%, 48px 48px, 48px 48px;
            overflow-x: hidden;
        }
        .glass-panel {
            background: var(--bg-card);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border: 1px solid var(--border-glass);
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }
        .glass-panel:hover {
            border-color: rgba(0, 242, 254, 0.45);
            box-shadow: 0 0 25px rgba(0, 242, 254, 0.12);
            transform: translateY(-3px);
        }
        .btn-neon {
            background: linear-gradient(135deg, #00f2fe 0%, #4facfe 100%);
            color: #051329;
            font-weight: 700;
            box-shadow: 0 0 18px rgba(0, 242, 254, 0.35);
            transition: all 0.25s ease;
        }
        .btn-neon:hover {
            box-shadow: 0 0 28px rgba(0, 242, 254, 0.6);
            transform: translateY(-2px);
        }
        .btn-ghost {
            background: rgba(16, 24, 40, 0.6);
            border: 1px solid var(--border-glass);
            color: #e2e8f0;
            transition: all 0.25s ease;
        }
        .btn-ghost:hover {
            border-color: var(--primary-neon);
            color: var(--primary-neon);
            background: rgba(0, 242, 254, 0.05);
        }
        .hud-border {
            position: relative;
        }
        .hud-border::before {
            content: "";
            position: absolute;
            top: 0;
            left: 0;
            width: 8px;
            height: 8px;
            border-top: 2px solid var(--primary-neon);
            border-left: 2px solid var(--primary-neon);
        }
        .hud-border::after {
            content: "";
            position: absolute;
            bottom: 0;
            right: 0;
            width: 8px;
            height: 8px;
            border-bottom: 2px solid var(--primary-neon);
            border-right: 2px solid var(--primary-neon);
        }
        .text-gradient {
            background: linear-gradient(135deg, #ffffff 0%, #38bdf8 60%, #00f2fe 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        .pulse-dot {
            animation: pulse-ring 2s infinite;
        }
        @keyframes pulse-ring {
            0% { transform: scale(0.95); opacity: 0.8; }
            50% { transform: scale(1.15); opacity: 1; box-shadow: 0 0 12px #00f2fe; }
            100% { transform: scale(0.95); opacity: 0.8; }
        }

/* roulang page: article */
:root {
            --bg-base: #0a0e17;
            --bg-surface: rgba(16, 24, 40, 0.72);
            --bg-card: rgba(23, 37, 65, 0.52);
            --border-glass: rgba(56, 189, 248, 0.22);
            --primary-neon: #00f2fe;
            --secondary-glow: #4facfe;
            --accent-cyber: #38bdf8;
            --text-main: #f8fafc;
            --text-muted: #94a3b8;
        }
        body {
            background-color: var(--bg-base);
            color: var(--text-main);
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
            background-image: 
                radial-gradient(circle at 15% 20%, rgba(0, 242, 254, 0.08) 0%, transparent 40%),
                radial-gradient(circle at 85% 65%, rgba(79, 172, 254, 0.06) 0%, transparent 45%),
                linear-gradient(rgba(255, 255, 255, 0.02) 1px, transparent 1px),
                linear-gradient(90deg, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
            background-size: 100% 100%, 100% 100%, 48px 48px, 48px 48px;
            overflow-x: hidden;
        }
        .btn-neon {
            background: linear-gradient(135deg, #00f2fe 0%, #4facfe 100%);
            color: #051329;
            font-weight: 700;
            box-shadow: 0 0 18px rgba(0, 242, 254, 0.35);
            transition: all 0.25s ease;
        }
        .btn-neon:hover {
            box-shadow: 0 0 28px rgba(0, 242, 254, 0.6);
            transform: translateY(-2px);
        }
        .btn-ghost {
            background: rgba(16, 24, 40, 0.6);
            border: 1px solid var(--border-glass);
            color: #e2e8f0;
            transition: all 0.25s ease;
        }
        .btn-ghost:hover {
            border-color: var(--primary-neon);
            color: var(--primary-neon);
            background: rgba(0, 242, 254, 0.05);
        }
        .hud-border {
            position: relative;
        }
        .hud-border::before {
            content: "";
            position: absolute;
            top: 0;
            left: 0;
            width: 8px;
            height: 8px;
            border-top: 2px solid var(--primary-neon);
            border-left: 2px solid var(--primary-neon);
        }
        .hud-border::after {
            content: "";
            position: absolute;
            bottom: 0;
            right: 0;
            width: 8px;
            height: 8px;
            border-bottom: 2px solid var(--primary-neon);
            border-right: 2px solid var(--primary-neon);
        }
        .text-gradient {
            background: linear-gradient(135deg, #ffffff 0%, #38bdf8 60%, #00f2fe 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        .pulse-dot {
            animation: pulse-glow 2s infinite;
        }
        @keyframes pulse-glow {
            0%, 100% { opacity: 1; transform: scale(1); }
            50% { opacity: 0.4; transform: scale(0.85); }
        }
        .article-content {
            font-size: 1.05rem;
            line-height: 1.85;
            color: #cbd5e1;
        }
        .article-content p {
            margin-bottom: 1.5rem;
        }
        .article-content h2 {
            font-size: 1.5rem;
            font-weight: 700;
            color: #f8fafc;
            margin-top: 2.5rem;
            margin-bottom: 1.2rem;
            padding-bottom: 0.5rem;
            border-bottom: 1px solid rgba(56, 189, 248, 0.25);
            position: relative;
        }
        .article-content h2::after {
            content: "";
            position: absolute;
            bottom: -1px;
            left: 0;
            width: 40px;
            height: 2px;
            background: var(--primary-neon);
        }
        .article-content h3 {
            font-size: 1.25rem;
            font-weight: 600;
            color: #e2e8f0;
            margin-top: 2rem;
            margin-bottom: 1rem;
        }
        .article-content blockquote {
            margin: 1.5rem 0;
            padding: 1rem 1.25rem;
            border-left: 3px solid var(--primary-neon);
            background: rgba(16, 24, 40, 0.55);
            border-radius: 0 0.5rem 0.5rem 0;
            color: #94a3b8;
            font-style: italic;
        }
        .article-content ul, .article-content ol {
            margin: 1.25rem 0;
            padding-left: 1.5rem;
        }
        .article-content ul li {
            list-style-type: square;
            margin-bottom: 0.5rem;
        }
        .article-content ol li {
            list-style-type: decimal;
            margin-bottom: 0.5rem;
        }
        .article-content code {
            font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
            background: rgba(56, 189, 248, 0.1);
            color: #38bdf8;
            padding: 0.2rem 0.4rem;
            border-radius: 0.25rem;
            font-size: 0.9em;
        }
        .article-content pre {
            background: #080d16;
            border: 1px solid var(--border-glass);
            border-radius: 0.5rem;
            padding: 1rem;
            overflow-x: auto;
            margin: 1.5rem 0;
        }
        .article-content img {
            border-radius: 0.75rem;
            border: 1px solid var(--border-glass);
            margin: 1.5rem 0;
            max-width: 100%;
            height: auto;
        }

/* roulang page: category1 */
:root {
            --bg-base: #0a0e17;
            --bg-surface: rgba(16, 24, 40, 0.72);
            --bg-card: rgba(23, 37, 65, 0.52);
            --border-glass: rgba(56, 189, 248, 0.22);
            --primary-neon: #00f2fe;
            --secondary-glow: #4facfe;
            --accent-cyber: #38bdf8;
            --text-main: #f8fafc;
            --text-muted: #94a3b8;
        }
        body {
            background-color: var(--bg-base);
            color: var(--text-main);
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
            background-image: 
                radial-gradient(circle at 15% 20%, rgba(0, 242, 254, 0.08) 0%, transparent 40%),
                radial-gradient(circle at 85% 65%, rgba(79, 172, 254, 0.06) 0%, transparent 45%),
                linear-gradient(rgba(255, 255, 255, 0.02) 1px, transparent 1px),
                linear-gradient(90deg, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
            background-size: 100% 100%, 100% 100%, 48px 48px, 48px 48px;
            overflow-x: hidden;
        }
        .btn-neon {
            background: linear-gradient(135deg, #00f2fe 0%, #4facfe 100%);
            color: #051329;
            font-weight: 700;
            box-shadow: 0 0 18px rgba(0, 242, 254, 0.35);
            transition: all 0.25s ease;
        }
        .btn-neon:hover {
            box-shadow: 0 0 28px rgba(0, 242, 254, 0.6);
            transform: translateY(-2px);
        }
        .btn-ghost {
            background: rgba(16, 24, 40, 0.6);
            border: 1px solid var(--border-glass);
            color: #e2e8f0;
            transition: all 0.25s ease;
        }
        .btn-ghost:hover {
            border-color: var(--primary-neon);
            color: var(--primary-neon);
            background: rgba(0, 242, 254, 0.05);
        }
        .hud-border {
            position: relative;
        }
        .hud-border::before {
            content: "";
            position: absolute;
            top: 0;
            left: 0;
            width: 8px;
            height: 8px;
            border-top: 2px solid var(--primary-neon);
            border-left: 2px solid var(--primary-neon);
        }
        .hud-border::after {
            content: "";
            position: absolute;
            bottom: 0;
            right: 0;
            width: 8px;
            height: 8px;
            border-bottom: 2px solid var(--primary-neon);
            border-right: 2px solid var(--primary-neon);
        }
        .text-gradient {
            background: linear-gradient(135deg, #ffffff 0%, #38bdf8 60%, #00f2fe 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        .glass-panel {
            background: var(--bg-surface);
            backdrop-filter: blur(14px);
            border: 1px solid var(--border-glass);
        }
        .glass-card {
            background: var(--bg-card);
            backdrop-filter: blur(12px);
            border: 1px solid var(--border-glass);
            transition: all 0.3s ease;
        }
        .glass-card:hover {
            border-color: rgba(0, 242, 254, 0.45);
            transform: translateY(-4px);
            box-shadow: 0 12px 30px rgba(0, 242, 254, 0.12);
        }
        .filter-btn {
            background: rgba(16, 24, 40, 0.7);
            border: 1px solid rgba(56, 189, 248, 0.2);
            color: var(--text-muted);
            transition: all 0.2s ease;
        }
        .filter-btn.active, .filter-btn:hover {
            background: rgba(0, 242, 254, 0.15);
            border-color: var(--primary-neon);
            color: #ffffff;
        }
        .pulse-dot {
            box-shadow: 0 0 10px #00f2fe;
            animation: pulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
        }
        @keyframes pulse {
            0%, 100% { opacity: 1; transform: scale(1); }
            50% { opacity: 0.4; transform: scale(0.85); }
        }