:root {
            --bg: #041214;
            --surface: #0a2226;
            --accent: #ffd166;
            --accent2: #14b8a6;
            --text: #effcff;
            --muted: #8fb0b3;
            --font-display: 'Russo One', sans-serif;
            --font-body: 'Open Sans', sans-serif;
            --container-width: 1200px;
            --radius: 8px;
            --transition: all 0.3s ease;
        }

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

        body {
            font-family: var(--font-body);
            background-color: var(--bg);
            color: var(--text);
            line-height: 1.6;
            overflow-x: hidden;
            -webkit-font-smoothing: antialiased;
        }

        h1, h2, h3, h4, h5, h6 {
            font-family: var(--font-display);
            line-height: 1.2;
            text-transform: uppercase;
            letter-spacing: 0.5px;
        }

        a {
            color: var(--accent2);
            text-decoration: none;
            transition: var(--transition);
        }

        a:hover {
            color: var(--accent);
        }

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

        /* --- BUTTONS --- */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 0.75rem 1.5rem;
            font-family: var(--font-display);
            font-size: 0.9rem;
            text-transform: uppercase;
            text-decoration: none;
            cursor: pointer;
            border: none;
            clip-path: polygon(10px 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%, 0 10px);
            transition: var(--transition);
            min-height: 44px;
        }

        .btn-primary {
            background-color: var(--accent);
            color: #000;
        }

        .btn-primary:hover {
            background-color: #ffde8a;
            box-shadow: 0 0 15px rgba(255, 209, 102, 0.4);
            color: #000;
        }

        .btn-secondary {
            background-color: transparent;
            color: var(--accent2);
            border: 2px solid var(--accent2);
            /* Reset clip-path for bordered button to avoid border issues, use standard border-radius or box-shadow trick */
            clip-path: none;
            border-radius: 4px;
        }

        .btn-secondary:hover {
            background-color: rgba(20, 184, 166, 0.1);
            box-shadow: 0 0 15px rgba(20, 184, 166, 0.3);
        }

        .btn-lg {
            padding: 1rem 2rem;
            font-size: 1.1rem;
        }

        /* --- HEADER (As per constraint) --- */
        header {
            background-color: rgba(4, 18, 20, 0.95);
            backdrop-filter: blur(10px);
            border-bottom: 1px solid rgba(20, 184, 166, 0.2);
            position: sticky;
            top: 0;
            z-index: 100;
        }

        .header-inner {
            display: flex;
            justify-content: space-between;
            align-items: center;
            height: 70px;
        }

        .brand {
            font-family: var(--font-display);
            font-size: 1.5rem;
            color: var(--text);
            text-decoration: none;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }

        .brand span {
            color: var(--accent);
        }

        .nav-links {
            display: flex;
            gap: 1.5rem;
        }

        .nav-links a {
            color: var(--text);
            font-weight: 600;
            font-size: 0.95rem;
            padding: 0.5rem 0;
        }

        .nav-links a:hover {
            color: var(--accent2);
        }

        .header-actions {
            display: flex;
            align-items: center;
            gap: 1rem;
        }

        .mobile-toggle {
            display: none;
            background: none;
            border: none;
            color: var(--text);
            font-size: 1.5rem;
            cursor: pointer;
            min-width: 44px;
            min-height: 44px;
        }

        /* --- HERO ARENA (PAGE BANNER) --- */
        .hero-arena {
            position: relative;
            padding: 4rem 0 3rem;
            background: radial-gradient(circle at 50% 0%, rgba(20, 184, 166, 0.15) 0%, transparent 60%);
            border-bottom: 1px solid rgba(20, 184, 166, 0.1);
        }

        .hero-arena::before {
            content: '';
            position: absolute;
            top: 0; left: 0; right: 0; bottom: 0;
            background-image: linear-gradient(rgba(20, 184, 166, 0.05) 1px, transparent 1px),
                              linear-gradient(90deg, rgba(20, 184, 166, 0.05) 1px, transparent 1px);
            background-size: 30px 30px;
            z-index: -1;
            opacity: 0.5;
        }

        .breadcrumb {
            font-size: 0.85rem;
            color: var(--muted);
            margin-bottom: 1.5rem;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }

        .hero-arena h1 {
            font-size: clamp(2rem, 5vw, 3.5rem);
            color: var(--text);
            margin-bottom: 1rem;
            text-shadow: 0 0 20px rgba(20, 184, 166, 0.3);
        }

        .meta-chips {
            display: flex;
            gap: 1rem;
            margin-bottom: 2rem;
            flex-wrap: wrap;
        }

        .chip {
            background: rgba(20, 184, 166, 0.1);
            border: 1px solid rgba(20, 184, 166, 0.3);
            color: var(--accent2);
            padding: 0.4rem 1rem;
            border-radius: 20px;
            font-size: 0.85rem;
            font-weight: 600;
        }

        .hero-intro {
            font-size: 1.1rem;
            color: var(--text);
            max-width: 800px;
            line-height: 1.8;
            border-left: 4px solid var(--accent);
            padding-left: 1.5rem;
            background: linear-gradient(90deg, rgba(255, 209, 102, 0.05) 0%, transparent 100%);
        }

        /* --- MAIN CONTENT ARENA --- */
        .content-arena {
            padding: 4rem 0;
        }

        .content-grid {
            display: grid;
            grid-template-columns: 1fr;
            gap: 2rem;
            max-width: 900px;
            margin: 0 auto;
        }

        .stadium-card {
            background-color: var(--surface);
            padding: 2.5rem;
            position: relative;
            clip-path: polygon(0 0, 100% 0, 100% calc(100% - 20px), calc(100% - 20px) 100%, 0 100%);
            border-top: 2px solid rgba(255, 209, 102, 0.1);
            border-left: 2px solid rgba(20, 184, 166, 0.3);
            transition: var(--transition);
        }

        .stadium-card:hover {
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
            border-left-color: var(--accent2);
        }

        .stadium-card::after {
            content: '';
            position: absolute;
            bottom: 0; right: 0;
            width: 20px; height: 20px;
            background-color: var(--accent2);
            opacity: 0.2;
        }

        .stadium-card h2 {
            font-size: 1.5rem;
            color: var(--accent);
            margin-bottom: 1.2rem;
            display: flex;
            align-items: center;
            gap: 0.75rem;
        }

        .stadium-card h2::before {
            content: '>>';
            color: var(--accent2);
            font-size: 1.2rem;
        }

        .stadium-card p {
            margin-bottom: 1rem;
            color: var(--muted);
        }

        .stadium-card p:last-child {
            margin-bottom: 0;
        }

        .stadium-card p a {
            color: var(--accent);
            font-weight: 600;
            text-decoration: underline;
            text-decoration-color: rgba(255, 209, 102, 0.4);
            text-underline-offset: 3px;
        }

        .stadium-card p a:hover {
            color: var(--text);
            text-decoration-color: var(--accent2);
        }

        /* Special styling for the security tips list */
        .checklist-card p:not(:first-child):not(:last-child) {
            position: relative;
            padding-left: 2rem;
            margin-bottom: 1rem;
            color: var(--text);
        }

        .checklist-card p:not(:first-child):not(:last-child)::before {
            content: '⚡';
            position: absolute;
            left: 0;
            color: var(--accent2);
            font-family: var(--font-display);
        }

        .checklist-card p:last-child {
            margin-top: 2rem;
            padding-top: 1.5rem;
            border-top: 1px dashed rgba(143, 176, 179, 0.2);
        }

        /* --- FAQ SECTION --- */
        .faq-arena {
            padding: 4rem 0;
            background-color: rgba(10, 34, 38, 0.5);
        }

        .section-title {
            text-align: center;
            margin-bottom: 3rem;
            font-size: 2rem;
            color: var(--text);
        }

        .section-title span {
            color: var(--accent2);
        }

        .faq-container {
            max-width: 800px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 1rem;
        }

        details {
            background-color: var(--surface);
            border: 1px solid rgba(20, 184, 166, 0.2);
            border-radius: var(--radius);
            overflow: hidden;
            transition: var(--transition);
        }

        details[open] {
            border-color: var(--accent2);
            box-shadow: 0 0 15px rgba(20, 184, 166, 0.1);
        }

        summary {
            padding: 1.2rem 1.5rem;
            font-family: var(--font-display);
            font-size: 1.1rem;
            color: var(--text);
            cursor: pointer;
            list-style: none;
            display: flex;
            justify-content: space-between;
            align-items: center;
            min-height: 44px;
        }

        summary::-webkit-details-marker {
            display: none;
        }

        summary::after {
            content: '+';
            color: var(--accent);
            font-size: 1.5rem;
            transition: transform 0.3s ease;
        }

        details[open] summary::after {
            transform: rotate(45deg);
            color: var(--accent2);
        }

        details p {
            padding: 0 1.5rem 1.5rem;
            color: var(--muted);
            border-top: 1px solid rgba(255,255,255,0.05);
            margin-top: 0.5rem;
            padding-top: 1rem;
        }

        /* --- RELATED PAGES (PORTAL) --- */
        .portal-arena {
            padding: 4rem 0;
            border-top: 1px solid rgba(20, 184, 166, 0.1);
        }

        .portal-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 1.5rem;
            max-width: 1000px;
            margin: 0 auto;
        }

        .portal-link {
            display: flex;
            align-items: center;
            justify-content: center;
            padding: 1.5rem;
            background: linear-gradient(135deg, var(--surface) 0%, rgba(4, 18, 20, 1) 100%);
            border: 1px solid rgba(20, 184, 166, 0.2);
            border-radius: var(--radius);
            font-family: var(--font-display);
            color: var(--text);
            text-transform: uppercase;
            text-align: center;
            position: relative;
            overflow: hidden;
            z-index: 1;
            min-height: 44px;
        }

        .portal-link::before {
            content: '';
            position: absolute;
            top: 0; left: -100%;
            width: 100%; height: 100%;
            background: linear-gradient(90deg, transparent, rgba(20, 184, 166, 0.2), transparent);
            transition: left 0.5s ease;
            z-index: -1;
        }

        .portal-link:hover {
            border-color: var(--accent);
            color: var(--accent);
            transform: translateY(-3px);
            box-shadow: 0 10px 20px rgba(0,0,0,0.4);
        }

        .portal-link:hover::before {
            left: 100%;
        }

        /* --- CTA ARENA --- */
        .cta-arena {
            padding: 5rem 0;
            text-align: center;
            background: radial-gradient(ellipse at center, rgba(255, 209, 102, 0.1) 0%, transparent 70%);
            position: relative;
        }

        .cta-arena h2 {
            font-size: 2.5rem;
            margin-bottom: 1rem;
            color: var(--text);
        }

        .cta-arena p {
            color: var(--muted);
            margin-bottom: 2.5rem;
            font-size: 1.1rem;
            max-width: 600px;
            margin-left: auto;
            margin-right: auto;
        }

        .cta-buttons {
            display: flex;
            justify-content: center;
            gap: 1.5rem;
            flex-wrap: wrap;
        }

        /* --- FOOTER (As per constraint) --- */
        footer {
            background-color: #02090a;
            padding: 4rem 0 2rem;
            border-top: 2px solid var(--accent2);
        }

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

        .footer-brand h2 {
            font-size: 2rem;
            color: var(--text);
            margin-bottom: 1rem;
        }

        .footer-brand h2 span {
            color: var(--accent);
        }

        .footer-tagline {
            color: var(--muted);
            max-width: 300px;
        }

        .footer-links-group h4 {
            color: var(--text);
            margin-bottom: 1.5rem;
            font-size: 1.1rem;
        }

        .footer-links-group a {
            display: block;
            color: var(--muted);
            margin-bottom: 0.75rem;
            font-size: 0.95rem;
            min-height: 24px; /* Touch target helper */
        }

        .footer-links-group a:hover {
            color: var(--accent2);
            padding-left: 5px;
        }

        .footer-bottom {
            text-align: center;
            padding-top: 2rem;
            border-top: 1px solid rgba(143, 176, 179, 0.2);
            color: var(--muted);
            font-size: 0.85rem;
        }

        /* --- RESPONSIVE DESIGN --- */
        @media (max-width: 1024px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
            .footer-brand {
                grid-column: 1 / -1;
            }
        }

        @media (max-width: 768px) {
            .header-actions .btn {
                display: none;
            }
            .mobile-toggle {
                display: block;
            }
            .nav-links {
                display: none;
                position: absolute;
                top: 70px;
                left: 0;
                width: 100%;
                background-color: var(--surface);
                flex-direction: column;
                padding: 1rem 0;
                border-bottom: 1px solid var(--accent2);
            }
            .nav-links.active {
                display: flex;
            }
            .nav-links a {
                padding: 1rem 1.5rem;
                border-bottom: 1px solid rgba(255,255,255,0.05);
            }
            .hero-arena {
                padding: 3rem 0 2rem;
            }
            .hero-intro {
                font-size: 1rem;
            }
            .stadium-card {
                padding: 1.5rem;
            }
            .cta-arena h2 {
                font-size: 2rem;
            }
        }

        @media (max-width: 390px) {
            .hero-arena h1 {
                font-size: 1.75rem;
            }
            .meta-chips {
                flex-direction: column;
                gap: 0.5rem;
            }
            .chip {
                width: fit-content;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 2rem;
            }
            .cta-buttons {
                flex-direction: column;
                width: 100%;
            }
            .cta-buttons .btn {
                width: 100%;
            }
        }


/* pipeline image & layout guards */
html, body { overflow-x: clip; }
img { max-width: 100%; height: auto; }
img.site-logo { height: 40px; width: auto; max-width: 240px; object-fit: contain; flex: none; }
header .logo a { display: inline-flex; align-items: center; flex: none; text-decoration: none; }
img.hero-visual { width: 100%; max-width: 560px; height: auto; object-fit: cover; border-radius: 16px; display: block; margin-inline: auto; }
img[class^="strip-"], img[class*=" strip-"] { width: 100%; height: auto; display: block; border-radius: 12px; object-fit: cover; }
/* 合规声明块（zb-disclaimer，全站 footer） */
.zb-disclaimer { margin-top: 18px !important; padding: 14px 0 0 0 !important; border-top: 1px solid rgba(128,128,128,.25) !important; font-size: .72rem !important; line-height: 1.7 !important; opacity: .85 !important; display: block !important; text-align: left !important; width: 100% !important; clear: both !important; }
.zb-disclaimer .zb-18 { display: inline-block !important; padding: 2px 10px !important; border: 1.5px solid currentColor !important; border-radius: 6px !important; font-weight: 800 !important; letter-spacing: 1px !important; margin: 0 0 10px 0 !important; font-size: .78rem !important; }
.zb-disclaimer p { display: block !important; margin: 5px 0 !important; padding: 0 !important; color: inherit !important; font-size: .72rem !important; line-height: 1.7 !important; }
.zb-disclaimer p:last-child { margin-bottom: 0 !important; }