:root {
            --color-primary: #0D2B45;
            --color-primary-hover: #163D61;
            --color-secondary: #C0C0C0;
            --color-secondary-hover: #E0E0E0;
            --color-accent: #00F2FF;
            --color-bg-main: #050B14;
            --color-bg-surface: #0B1624;
            --color-bg-elevated: #132135;
            --color-text-primary: #E6F1FF;
            --color-text-secondary: #B0C4DE;
            --color-text-muted: #647B9A;
            --color-btn-bg: #00F2FF;
            --color-btn-text: #050B14;
            --color-btn-hover-bg: #70F9FF;
            --color-border: #1C2F45;
            --color-border-strong: #2A4261;
            --color-border-brand: #00F2FF;
            --font-heading: 'Exo 2', sans-serif;
            --font-body: 'Be Vietnam Pro', sans-serif;
            --radius-sm: 4px;
            --radius-md: 8px;
            --radius-lg: 16px;
            --radius-pill: 9999px;
            --shadow-card: 0 4px 20px rgba(0, 0, 0, 0.4);
            --glow-cyan: 0 0 15px rgba(0, 242, 255, 0.5);
            --grad-brand: linear-gradient(135deg, #0D2B45 0%, #00F2FF 100%);
            --grad-hero: radial-gradient(circle at center, #132135 0%, #050B14 100%);
            --grad-btn: linear-gradient(180deg, #00F2FF 0%, #00C2D1 100%);
        }

        html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
        body {
            margin: 0;
            font-family: var(--font-body);
            background-color: var(--color-bg-main);
            color: var(--color-text-primary);
            font-size: clamp(15px, 3.9vw, 16px);
            line-height: 1.65;
            padding-inline: 14px;
            padding-bottom: calc(72px + env(safe-area-inset-bottom, 0px));
            overflow-x: hidden;
        }

        header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 12px 0;
            max-width: 1200px;
            margin: 0 auto;
        }

        .header-brand {
            display: flex;
            align-items: center;
            gap: 8px;
            text-decoration: none;
            color: inherit;
        }

        .header-brand-name {
            font-size: 16px;
            font-weight: normal;
        }

        .header-actions {
            display: flex;
            gap: 10px;
        }

        .btn-nav {
            text-decoration: none;
            font-family: var(--font-heading);
            font-weight: 600;
            padding: 8px 16px;
            border-radius: var(--radius-md);
            font-size: 14px;
            transition: transform 0.2s, background-color 0.2s;
        }

        .btn-login {
            background-color: var(--color-bg-elevated);
            color: var(--color-text-primary);
            border: 1px solid var(--color-border-strong);
        }

        .btn-register {
            background: var(--grad-btn);
            color: var(--color-btn-text);
        }

        main {
            max-width: 1200px;
            margin: 0 auto;
        }

        .hero-section {
            padding: 40px 0;
            text-align: center;
            background: var(--grad-hero);
            border-radius: var(--radius-lg);
            margin-bottom: 20px;
        }

        h1 {
            font-family: var(--font-heading);
            font-size: clamp(1.6rem, 6.5vw, 2.4rem);
            line-height: 1.2;
            margin-bottom: 20px;
            color: var(--color-accent);
            text-shadow: var(--glow-cyan);
        }

        .hero-text {
            max-width: 800px;
            margin: 0 auto 30px;
            color: var(--color-text-secondary);
        }

        .hero-cta {
            display: block;
            width: 100%;
            max-width: 400px;
            margin: 0 auto 25px;
            padding: 16px;
            background: var(--grad-btn);
            color: var(--color-btn-text);
            text-decoration: none;
            font-weight: 700;
            font-family: var(--font-heading);
            border-radius: var(--radius-pill);
            font-size: 1.2rem;
            box-shadow: var(--glow-cyan);
        }

        .hero-tags {
            display: flex;
            justify-content: center;
            gap: 10px;
            flex-wrap: wrap;
        }

        .hero-tag {
            background: var(--color-bg-surface);
            border: 1px solid var(--color-border-brand);
            color: var(--color-accent);
            padding: 4px 12px;
            border-radius: var(--radius-pill);
            font-size: 12px;
            font-weight: 500;
        }

        .banner-link img {
            width: 100%;
            aspect-ratio: 2/1;
            object-fit: cover;
            border-radius: var(--radius-lg);
            display: block;
        }

        .category-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 15px;
            margin: 30px 0;
        }

        .category-tile {
            background: var(--color-bg-surface);
            border: 1px solid var(--color-border);
            padding: 20px;
            border-radius: var(--radius-lg);
            text-decoration: none;
            color: inherit;
            text-align: center;
            transition: border-color 0.3s, transform 0.3s;
        }

        .category-tile:hover {
            border-color: var(--color-accent);
            transform: translateY(-5px);
        }

        .category-tile i {
            font-size: 2rem;
            color: var(--color-accent);
            margin-bottom: 10px;
        }

        .category-tile-name {
            display: block;
            font-size: 1.1rem;
            font-weight: 700;
            margin-bottom: 5px;
        }

        .category-tile-desc {
            font-size: 13px;
            color: var(--color-text-muted);
        }

        h2 {
            font-family: var(--font-heading);
            font-size: clamp(1.3rem, 5.2vw, 1.8rem);
            line-height: 1.25;
            margin: 40px 0 20px;
            color: var(--color-text-primary);
            border-left: 4px solid var(--color-accent);
            padding-left: 15px;
        }

        .game-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 15px;
        }

        .game-card {
            background: var(--color-bg-surface);
            border-radius: var(--radius-md);
            text-decoration: none;
            color: inherit;
            overflow: hidden;
            border: 1px solid var(--color-border);
            transition: box-shadow 0.3s;
        }

        .game-card:hover {
            box-shadow: var(--shadow-card);
            border-color: var(--color-accent);
        }

        .game-card img {
            width: 100%;
            aspect-ratio: 1/1;
            object-fit: cover;
        }

        .game-card h3 {
            font-size: 1rem;
            padding: 12px;
            margin: 0;
            text-align: center;
            font-family: var(--font-body);
        }

        .facts-container {
            background: var(--color-bg-surface);
            border-radius: var(--radius-lg);
            padding: 20px;
            border: 1px solid var(--color-border-strong);
        }

        .freshness-notice {
            font-style: italic;
            font-size: 13px;
            color: var(--color-text-muted);
            margin-bottom: 20px;
            display: block;
        }

        .facts-table {
            width: 100%;
            border-collapse: collapse;
        }

        .facts-table td {
            padding: 12px;
            border-bottom: 1px solid var(--color-border);
        }

        .facts-label {
            font-weight: 600;
            color: var(--color-text-secondary);
            width: 40%;
        }

        .facts-value {
            color: var(--color-text-primary);
        }

        .facts-footer {
            margin-top: 15px;
            font-size: 13px;
            text-align: center;
        }

        .facts-footer a {
            color: var(--color-accent);
            text-decoration: none;
        }

        .toc-nav {
            display: flex;
            overflow-x: auto;
            gap: 10px;
            padding: 10px 0;
            margin-bottom: 30px;
            scrollbar-width: none;
        }

        .toc-nav::-webkit-scrollbar { display: none; }

        .toc-link {
            background: var(--color-bg-elevated);
            color: var(--color-text-secondary);
            text-decoration: none;
            padding: 8px 16px;
            border-radius: var(--radius-pill);
            white-space: nowrap;
            font-size: 14px;
            border: 1px solid var(--color-border);
        }

        .toc-link:hover {
            color: var(--color-accent);
            border-color: var(--color-accent);
        }

        .promo-grid {
            display: grid;
            grid-template-columns: 1fr;
            gap: 20px;
        }

        .promo-card {
            background: var(--color-bg-surface);
            border-left: 5px solid var(--color-accent);
            padding: 25px;
            border-radius: var(--radius-md);
            display: flex;
            flex-direction: column;
            gap: 15px;
        }

        .promo-card h3 {
            margin: 0;
            font-family: var(--font-heading);
            color: var(--color-accent);
        }

        .promo-cta {
            align-self: flex-start;
            padding: 10px 20px;
            background: var(--grad-btn);
            color: var(--color-btn-text);
            text-decoration: none;
            border-radius: var(--radius-md);
            font-weight: 600;
            font-size: 14px;
        }

        .usp-grid {
            display: grid;
            grid-template-columns: 1fr;
            gap: 20px;
            margin: 30px 0;
        }

        .usp-tile {
            display: flex;
            gap: 15px;
            background: var(--color-bg-surface);
            padding: 20px;
            border-radius: var(--radius-lg);
            align-items: center;
        }

        .usp-tile i {
            font-size: 1.5rem;
            color: var(--color-accent);
            flex-shrink: 0;
        }

        .usp-content strong {
            display: block;
            font-size: 1.1rem;
            margin-bottom: 5px;
        }

        .usp-content p {
            margin: 0;
            font-size: 14px;
            color: var(--color-text-secondary);
        }

        .payment-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 15px;
        }

        .payment-card {
            background: var(--color-bg-surface);
            padding: 20px;
            border-radius: var(--radius-lg);
            text-align: center;
            border: 1px solid var(--color-border);
        }

        .payment-card i {
            font-size: 2rem;
            color: var(--color-accent);
            margin-bottom: 10px;
        }

        .payment-card-name {
            display: block;
            font-weight: 700;
            margin-bottom: 8px;
        }

        .payment-card-desc {
            font-size: 12px;
            color: var(--color-text-muted);
        }

        .step-list {
            display: grid;
            grid-template-columns: 1fr;
            gap: 20px;
        }

        .step-item {
            display: flex;
            gap: 20px;
            align-items: flex-start;
        }

        .step-num {
            background: var(--color-accent);
            color: var(--color-btn-text);
            width: 32px;
            height: 32px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            flex-shrink: 0;
        }

        .step-content h3 {
            margin: 0 0 10px;
            font-size: 1.2rem;
        }

        .step-content a {
            color: inherit;
            text-decoration: none;
        }

        .app-section {
            background: var(--color-bg-elevated);
            padding: 30px;
            border-radius: var(--radius-lg);
            text-align: center;
        }

        .app-cta {
            display: inline-block;
            margin-top: 20px;
            padding: 15px 30px;
            background: var(--grad-btn);
            color: var(--color-btn-text);
            text-decoration: none;
            border-radius: var(--radius-pill);
            font-weight: 700;
        }

        .guide-list {
            display: grid;
            grid-template-columns: 1fr;
            gap: 20px;
        }

        .guide-item {
            background: var(--color-bg-surface);
            padding: 20px;
            border-radius: var(--radius-lg);
            border: 1px solid var(--color-border);
        }

        .guide-meta {
            font-size: 12px;
            color: var(--color-text-muted);
            margin-bottom: 10px;
            display: block;
        }

        .announcement-grid {
            display: grid;
            grid-template-columns: 1fr;
            gap: 15px;
        }

        .announcement-card {
            background: var(--color-bg-surface);
            padding: 20px;
            border-radius: var(--radius-md);
            display: flex;
            gap: 15px;
            border-left: 3px solid var(--color-accent);
        }

        .announcement-card i {
            color: var(--color-accent);
            margin-top: 5px;
        }

        .announcement-date {
            display: block;
            font-size: 12px;
            color: var(--color-text-muted);
            margin-top: 10px;
        }

        .faq-item {
            margin-bottom: 10px;
            background: var(--color-bg-surface);
            border-radius: var(--radius-md);
            border: 1px solid var(--color-border);
        }

        .faq-item summary {
            padding: 15px;
            cursor: pointer;
            list-style: none;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .faq-item summary h3 {
            margin: 0;
            font-size: 1.1rem;
            color: var(--color-text-primary);
        }

        .faq-answer {
            padding: 0 15px 15px;
            color: var(--color-text-secondary);
            font-size: 14px;
        }

        .about-text {
            color: var(--color-text-secondary);
            margin-bottom: 30px;
        }

        .team-card {
            background: var(--color-bg-elevated);
            padding: 25px;
            border-radius: var(--radius-lg);
            border: 1px solid var(--color-border-strong);
        }

        .team-card h3 {
            margin: 0 0 15px;
            color: var(--color-accent);
        }

        .team-scope {
            font-size: 14px;
            color: var(--color-text-secondary);
            margin-bottom: 15px;
        }

        .security-section {
            background: var(--color-bg-surface);
            padding: 25px;
            border-radius: var(--radius-lg);
            border: 1px solid var(--color-border);
        }

        .security-grid {
            display: grid;
            grid-template-columns: 1fr;
            gap: 20px;
            margin-bottom: 20px;
        }

        .security-item {
            display: flex;
            gap: 15px;
            align-items: center;
        }

        .security-item i {
            color: var(--color-accent);
        }

        footer {
            margin-top: 50px;
            padding: 40px 0;
            border-top: 1px solid var(--color-border);
            text-align: center;
        }

        .footer-sitemap {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 10px;
            margin-bottom: 30px;
            max-width: 800px;
            margin-inline: auto;
        }

        .footer-link {
            color: var(--color-text-secondary);
            text-decoration: none;
            font-size: 14px;
        }

        .footer-contact {
            margin-bottom: 20px;
            font-size: 14px;
        }

        .footer-legal {
            font-size: 12px;
            color: var(--color-text-muted);
            max-width: 600px;
            margin: 0 auto;
        }

        .navigator {
            position: fixed;
            inset-inline: 0;
            bottom: 0;
            background: var(--color-bg-surface);
            display: flex;
            justify-content: space-around;
            padding: 10px 0 calc(10px + env(safe-area-inset-bottom));
            border-top: 1px solid var(--color-border-strong);
            z-index: 100;
        }

        .nav-item {
            text-decoration: none;
            color: var(--color-text-secondary);
            display: flex;
            flex-direction: column;
            align-items: center;
            font-size: 11px;
            gap: 4px;
        }

        .nav-item i {
            font-size: 1.2rem;
        }

        .nav-item:hover {
            color: var(--color-accent);
        }

        .util-link {
            display: inline-block;
            margin-top: 10px;
            color: var(--color-accent);
            text-decoration: none;
            font-weight: 500;
        }

        @media (min-width: 768px) {
            body { padding-inline: 24px; padding-bottom: 24px; }
            .category-grid { grid-template-columns: repeat(3, 1fr); }
            .game-grid { grid-template-columns: repeat(4, 1fr); }
            .payment-grid { grid-template-columns: repeat(4, 1fr); }
            .step-list { grid-template-columns: repeat(2, 1fr); }
            .promo-grid { grid-template-columns: repeat(3, 1fr); }
            .usp-grid { grid-template-columns: repeat(2, 1fr); }
            .announcement-grid { grid-template-columns: repeat(2, 1fr); }
            .guide-list { grid-template-columns: repeat(2, 1fr); }
            .navigator { position: static; display: none; }
            footer { padding-bottom: 24px; }
        }

        @media (min-width: 1200px) {
            body { padding-inline: 32px; max-width: 1200px; margin-inline: auto; }
            .category-grid { grid-template-columns: repeat(4, 1fr); }
        }

        section {
            content-visibility: auto;
            contain-intrinsic-size: 1px 500px;
        }