:root {
            --bg: #0d0a0c;
            --bg-elevated: #1a1016;
            --bg-card: #1f141a;
            --bg-card-hover: #291a22;
            --border: rgba(255, 180, 200, 0.06);
            --border-strong: rgba(255, 180, 200, 0.12);
            --rose: #e87890;
            --rose-light: #f0a0b8;
            --rose-soft: rgba(232, 120, 144, 0.13);
            --rose-glow: rgba(232, 120, 144, 0.07);
            --warm: #e8a878;
            --warm-soft: rgba(232, 168, 120, 0.12);
            --mauve: #c48eb8;
            --mauve-soft: rgba(196, 142, 184, 0.12);
            --text: #ece4e8;
            --text-secondary: #b8a8b0;
            --text-muted: #7d6e76;
            --font-display: 'Instrument Serif', Georgia, 'Times New Roman', serif;
            --font-body: 'Source Serif 4', Georgia, 'Times New Roman', serif;
            --font-mono: 'DM Mono', 'Courier New', monospace;
            --font-sans: system-ui, -apple-system, 'Segoe UI', sans-serif;
        }

        *,
        *::before,
        *::after {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
            font-size: 16px;
            -webkit-text-size-adjust: 100%;
        }
        body {
            font-family: var(--font-body);
            background: var(--bg);
            color: var(--text);
            line-height: 1.75;
            overflow-x: hidden;
            min-height: 100vh;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        body::before {
            content: '';
            position: fixed;
            inset: 0;
            background:
                radial-gradient(ellipse at 68% 18%, rgba(232, 120, 144, 0.05) 0%, transparent 55%),
                radial-gradient(ellipse at 22% 55%, rgba(196, 142, 184, 0.04) 0%, transparent 50%),
                radial-gradient(ellipse at 58% 82%, rgba(232, 168, 120, 0.035) 0%, transparent 45%);
            pointer-events: none;
            z-index: 0;
        }
        a {
            color: inherit;
            text-decoration: none;
        }
        ul {
            list-style: none;
        }
        .container {
            max-width: 1180px;
            margin: 0 auto;
            padding: 0 2.5rem;
        }
        .skip-link {
            position: absolute;
            top: -100px;
            left: 1rem;
            z-index: 200;
            background: var(--rose);
            color: #fff;
            padding: 0.5rem 1rem;
            border-radius: 0 0 6px 6px;
            font-family: var(--font-sans);
            font-size: 0.85rem;
            transition: top 0.3s;
        }
        .skip-link:focus {
            top: 0;
        }

        header {
            position: sticky;
            top: 0;
            z-index: 100;
            background: rgba(13, 10, 12, 0.9);
            backdrop-filter: blur(22px);
            -webkit-backdrop-filter: blur(22px);
            border-bottom: 1px solid var(--border);
        }
        header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 66px;
            gap: 1rem;
        }
        .logo {
            flex-shrink: 0;
            display: flex;
            align-items: center;
            gap: 0.55rem;
            text-decoration: none;
        }
        .logo-img {
            height: 2.2rem;
            width: auto;
            display: block;
            flex-shrink: 0;
        }
        .logo-text {
            display: flex;
            align-items: baseline;
        }
        .logo-text .brand {
            font-family: var(--font-display);
            font-size: 1.45rem;
            color: var(--text);
            letter-spacing: -0.01em;
            line-height: 1;
        }
        .logo-text .brand::after {
            content: '.';
            color: var(--rose);
            font-style: italic;
            margin-left: 1px;
        }
        .logo:hover .logo-text .brand {
            color: var(--rose-light);
            transition: color 0.25s ease;
        }
        .site-nav ul {
            display: flex;
            gap: 0.2rem;
            flex-wrap: wrap;
        }
        .site-nav a {
            font-family: var(--font-mono);
            font-size: 0.74rem;
            color: var(--text-muted);
            padding: 0.4rem 0.85rem;
            border-radius: 6px;
            transition: all 0.22s ease;
            letter-spacing: 0.02em;
            white-space: nowrap;
        }
        .site-nav a:hover {
            color: var(--text);
            background: rgba(255, 180, 200, 0.04);
        }
        .site-nav a[aria-current="page"] {
            color: var(--rose);
            background: var(--rose-soft);
        }
        main {
            position: relative;
            z-index: 1;
        }

        .btn {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            padding: 0.7rem 1.5rem;
            border-radius: 6px;
            font-family: var(--font-mono);
            font-size: 0.78rem;
            font-weight: 500;
            cursor: pointer;
            border: none;
            transition: all 0.25s ease;
            letter-spacing: 0.03em;
            white-space: nowrap;
        }
        .btn-primary {
            background: var(--rose);
            color: #fff;
        }
        .btn-primary:hover {
            background: var(--rose-light);
            transform: translateY(-1px);
            box-shadow: 0 8px 28px rgba(232, 120, 144, 0.3);
        }
        .btn-outline {
            background: transparent;
            color: var(--text-secondary);
            border: 1px solid var(--border-strong);
        }
        .btn-outline:hover {
            border-color: var(--rose);
            color: var(--rose);
            transform: translateY(-1px);
        }

        .page-hero {
            padding: 4.5rem 0 3rem;
            text-align: center;
            border-bottom: 1px solid var(--border);
        }
        .page-hero h1 {
            font-family: var(--font-display);
            font-size: clamp(2.6rem, 5vw, 4rem);
            font-weight: 400;
            line-height: 1.1;
            letter-spacing: -0.02em;
            color: var(--text);
            margin-bottom: 1rem;
        }
        .page-hero h1 em {
            font-style: italic;
            color: var(--rose);
        }
        .page-hero .sub {
            font-size: 1rem;
            color: var(--text-secondary);
            max-width: 680px;
            margin: 0 auto;
            line-height: 1.8;
        }

        .content-section {
            padding: 5rem 0;
        }
        .section-intro {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 3rem;
            align-items: start;
            margin-bottom: 4rem;
        }
        .section-intro h2 {
            font-family: var(--font-display);
            font-size: clamp(2rem, 3.5vw, 2.8rem);
            font-weight: 400;
            line-height: 1.2;
            color: var(--text);
            letter-spacing: -0.02em;
        }
        .section-intro h2 em {
            font-style: italic;
            color: var(--rose);
        }
        .section-intro p {
            font-size: 0.95rem;
            color: var(--text-secondary);
            line-height: 1.9;
        }

        .rule-basics-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 1rem;
            margin: 2.5rem 0;
        }
        .rule-basic-item {
            background: var(--bg-elevated);
            border: 1px solid var(--border);
            border-radius: 10px;
            padding: 1.5rem 1.2rem;
            text-align: center;
            transition: border-color 0.3s;
        }
        .rule-basic-item:hover {
            border-color: var(--rose);
        }
        .rule-basic-item .type-label {
            font-family: var(--font-mono);
            font-size: 0.7rem;
            color: var(--rose);
            letter-spacing: 0.06em;
            margin-bottom: 0.5rem;
        }
        .rule-basic-item h4 {
            font-family: var(--font-display);
            font-size: 1.1rem;
            font-weight: 400;
            color: var(--text);
            margin-bottom: 0.4rem;
        }
        .rule-basic-item p {
            font-size: 0.76rem;
            color: var(--text-muted);
            line-height: 1.6;
        }

        .system-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 1rem;
            margin: 2rem 0;
        }
        .system-card {
            background: var(--bg-elevated);
            border: 1px solid var(--border);
            border-radius: 12px;
            padding: 1.8rem;
            transition: all 0.3s ease;
        }
        .system-card:hover {
            border-color: var(--rose);
            background: var(--bg-card-hover);
        }
        .system-card h4 {
            font-family: var(--font-display);
            font-size: 1.3rem;
            font-weight: 400;
            color: var(--text);
            margin-bottom: 0.5rem;
        }
        .system-card .tag {
            font-family: var(--font-mono);
            font-size: 0.6rem;
            padding: 0.15rem 0.55rem;
            border-radius: 4px;
            background: var(--rose-soft);
            color: var(--rose);
            letter-spacing: 0.05em;
            display: inline-block;
            margin-bottom: 0.8rem;
        }
        .system-card p {
            font-size: 0.85rem;
            color: var(--text-secondary);
            line-height: 1.8;
        }

        .scenario-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 1rem;
            margin: 2.5rem 0;
        }
        .scenario-card {
            background: var(--bg-elevated);
            border: 1px solid var(--border);
            border-radius: 10px;
            padding: 1.5rem 1.1rem;
            text-align: center;
            transition: all 0.3s ease;
        }
        .scenario-card:hover {
            border-color: var(--rose);
            transform: translateY(-3px);
        }
        .scenario-card .icon {
            font-size: 2rem;
            margin-bottom: 0.5rem;
        }
        .scenario-card h4 {
            font-family: var(--font-display);
            font-size: 1.05rem;
            font-weight: 400;
            color: var(--text);
            margin-bottom: 0.3rem;
        }
        .scenario-card p {
            font-size: 0.74rem;
            color: var(--text-muted);
            line-height: 1.6;
        }

        .dns-block {
            background: var(--bg-elevated);
            border: 1px solid var(--border);
            border-radius: 14px;
            padding: 2.5rem;
            margin: 3rem 0;
        }
        .dns-block h3 {
            font-family: var(--font-display);
            font-size: 1.9rem;
            font-weight: 400;
            color: var(--text);
            margin-bottom: 1rem;
        }
        .dns-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 1rem;
            margin-top: 1.5rem;
        }
        .dns-card {
            background: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: 8px;
            padding: 1.2rem;
        }
        .dns-card h5 {
            font-family: var(--font-mono);
            font-size: 0.75rem;
            color: var(--rose);
            letter-spacing: 0.04em;
            margin-bottom: 0.4rem;
        }
        .dns-card p {
            font-size: 0.82rem;
            color: var(--text-secondary);
            line-height: 1.7;
        }

        .cta-download-alt {
            text-align: center;
            padding: 3rem;
            margin: 4rem 0 2rem;
            border: 1px solid var(--rose);
            border-radius: 14px;
            position: relative;
            overflow: hidden;
            background: var(--bg-elevated);
        }
        .cta-download-alt::before {
            content: '';
            position: absolute;
            inset: 0;
            background: radial-gradient(ellipse at 50% 50%, rgba(232,120,144,0.05) 0%, transparent 65%);
            pointer-events: none;
        }
        .cta-download-alt h3 {
            font-family: var(--font-display);
            font-size: 1.7rem;
            font-weight: 400;
            color: var(--text);
            margin-bottom: 0.8rem;
            position: relative;
        }
        .cta-download-alt p {
            color: var(--text-secondary);
            margin-bottom: 1.5rem;
            position: relative;
        }
        .cta-download-alt .btn {
            position: relative;
        }

        footer {
            border-top: 1px solid var(--border);
            padding: 3rem 0;
            position: relative;
            z-index: 1;
        }
        footer .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 1.5rem;
        }
        .footer-left {
            display: flex;
            align-items: center;
            gap: 2rem;
            flex-wrap: wrap;
        }
        .footer-logo {
            font-family: var(--font-display);
            font-size: 1.05rem;
            color: var(--text);
        }
        .footer-logo em {
            color: var(--rose);
            font-style: italic;
        }
        .footer-copy {
            font-family: var(--font-mono);
            font-size: 0.68rem;
            color: var(--text-muted);
        }
        .footer-links {
            display: flex;
            gap: 1.6rem;
            flex-wrap: wrap;
        }
        .footer-links a {
            font-family: var(--font-mono);
            font-size: 0.7rem;
            color: var(--text-muted);
            transition: color 0.2s ease;
        }
        .footer-links a:hover {
            color: var(--rose);
        }

        @media (max-width: 900px) {
            .section-intro {
                grid-template-columns: 1fr;
                gap: 1rem;
            }
            .rule-basics-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .system-grid {
                grid-template-columns: 1fr;
            }
            .scenario-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .dns-grid {
                grid-template-columns: 1fr;
            }
        }
        @media (max-width: 600px) {
            .container {
                padding: 0 1rem;
            }
            header .container {
                flex-direction: column;
                height: auto;
                padding-top: 0.6rem;
                padding-bottom: 0.6rem;
                gap: 0.3rem;
            }
            .site-nav a {
                font-size: 0.65rem;
                padding: 0.28rem 0.45rem;
            }
            .page-hero h1 {
                font-size: 1.9rem;
            }
            .rule-basics-grid {
                grid-template-columns: 1fr;
            }
            .scenario-grid {
                grid-template-columns: 1fr;
            }
            footer .container {
                flex-direction: column;
                text-align: center;
            }
            .footer-left {
                flex-direction: column;
                gap: 0.3rem;
            }
            .footer-links {
                justify-content: center;
                gap: 1rem;
            }
        }