:root {
            --bg: #140505;
            --surface: #260d0d;
            --accent: #ff6b00;
            --accent2: #ffd700;
            --text: #fff5f0;
            --muted: #c28888;
            --font-body: 'Fira Sans', sans-serif;
            --font-display: 'Oswald', sans-serif;
        }

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

        body {
            font-family: var(--font-body);
            background-color: var(--bg);
            color: var(--text);
            line-height: 1.6;
            font-size: 16px;
            overflow-x: hidden;
        }

        a {
            color: var(--accent);
            text-decoration: none;
            transition: color 0.3s ease;
        }

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

        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }

        /* HEADER (Matches Homepage Family) */
        header {
            background-color: var(--surface);
            border-bottom: 2px solid var(--accent);
            position: sticky;
            top: 0;
            z-index: 100;
        }

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

        .logo-area {
            display: flex;
            align-items: center;
            gap: 10px;
            font-family: var(--font-display);
            font-weight: 700;
            font-size: 1.5rem;
            color: var(--accent);
            text-transform: uppercase;
        }

        .menu-toggle {
            display: none;
            background: none;
            border: none;
            color: var(--text);
            font-size: 1.8rem;
            cursor: pointer;
        }

        nav ul {
            display: flex;
            list-style: none;
            gap: 20px;
        }

        nav a {
            color: var(--text);
            font-family: var(--font-display);
            text-transform: uppercase;
            font-weight: 600;
            letter-spacing: 0.5px;
        }

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

        /* HERO BANNER - Unique for Speed Demon */
        .hero {
            position: relative;
            padding: 60px 0 40px;
            background: linear-gradient(135deg, rgba(20,5,5,0.9) 0%, rgba(38,13,13,0.95) 100%);
            border-bottom: 1px solid rgba(255, 107, 0, 0.2);
            overflow: hidden;
        }

        .hero::before {
            content: '';
            position: absolute;
            top: 0; left: 0; right: 0; bottom: 0;
            background: radial-gradient(circle at 80% 50%, rgba(255, 107, 0, 0.15) 0%, transparent 60%);
            z-index: 0;
        }

        .hero-content {
            position: relative;
            z-index: 1;
        }

        .breadcrumb {
            font-size: 0.875rem;
            color: var(--muted);
            margin-bottom: 20px;
            display: inline-block;
            background: rgba(0,0,0,0.3);
            padding: 5px 15px;
            border-radius: 20px;
            border: 1px solid rgba(194, 136, 136, 0.2);
        }

        h1 {
            font-family: var(--font-display);
            font-size: 2.5rem;
            line-height: 1.1;
            margin-bottom: 15px;
            text-transform: uppercase;
            color: #fff;
            text-shadow: 2px 2px 0px #000, -1px -1px 15px rgba(255, 107, 0, 0.4);
        }

        .meta-chips {
            display: flex;
            gap: 10px;
            flex-wrap: wrap;
        }

        .chip {
            background: var(--surface);
            color: var(--accent2);
            font-size: 0.85rem;
            padding: 4px 12px;
            border-radius: 4px;
            border-left: 3px solid var(--accent);
            font-weight: 500;
        }

        /* CONTENT AREA - Unique structural design */
        .main-content {
            padding: 40px 0;
        }

        h2 {
            font-family: var(--font-display);
            font-size: 1.8rem;
            color: var(--accent);
            margin: 40px 0 20px;
            text-transform: uppercase;
            display: flex;
            align-items: center;
            gap: 15px;
        }

        h2::before {
            content: '';
            display: block;
            width: 30px;
            height: 4px;
            background: var(--accent2);
            transform: skewX(-30deg);
        }

        p {
            margin-bottom: 20px;
            color: var(--text);
        }

        /* Mechanic Intro Blockquote */
        .intro-block {
            background: var(--surface);
            padding: 30px;
            border-left: 5px solid var(--accent);
            position: relative;
            margin-bottom: 40px;
            box-shadow: 5px 5px 0px rgba(0,0,0,0.5);
        }

        .intro-block p {
            font-size: 1.1rem;
            font-style: italic;
            margin-bottom: 0;
            color: #fff;
        }

        /* Highlight Card for Turbo Section */
        .turbo-card {
            background: linear-gradient(to right, var(--surface), #3a1414);
            border: 1px solid rgba(255, 215, 0, 0.2);
            border-radius: 8px;
            padding: 30px;
            margin: 30px 0;
            position: relative;
            overflow: hidden;
        }

        .turbo-card::after {
            content: '⚡';
            position: absolute;
            right: -20px;
            bottom: -30px;
            font-size: 100px;
            opacity: 0.05;
            transform: rotate(-15deg);
        }

        /* Custom Checklist */
        .pitstop-list {
            list-style: none;
            margin: 20px 0 30px;
            counter-reset: gear;
        }

        .pitstop-list li {
            position: relative;
            padding-left: 50px;
            margin-bottom: 15px;
            background: rgba(38, 13, 13, 0.5);
            padding-top: 12px;
            padding-bottom: 12px;
            padding-right: 15px;
            border-radius: 4px;
        }

        .pitstop-list li::before {
            counter-increment: gear;
            content: counter(gear);
            position: absolute;
            left: 10px;
            top: 50%;
            transform: translateY(-50%) skewX(-10deg);
            background: var(--accent);
            color: #000;
            width: 28px;
            height: 28px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-family: var(--font-display);
            font-weight: bold;
            font-size: 1.1rem;
        }

        /* Comparison Section */
        .comparison-box {
            border-top: 2px dashed var(--muted);
            border-bottom: 2px dashed var(--muted);
            padding: 30px 0;
            margin: 40px 0;
        }

        /* Strategy Section */
        .strategy-alert {
            background: rgba(255, 215, 0, 0.1);
            border-left: 4px solid var(--accent2);
            padding: 20px;
            margin-top: 20px;
        }

        /* FAQ Section */
        .faq-wrapper {
            margin-top: 50px;
        }

        details {
            background: var(--surface);
            margin-bottom: 10px;
            border-radius: 4px;
            overflow: hidden;
            border: 1px solid rgba(255, 255, 255, 0.05);
        }

        summary {
            padding: 18px 20px;
            font-family: var(--font-display);
            font-size: 1.1rem;
            font-weight: 600;
            cursor: pointer;
            list-style: none;
            display: flex;
            justify-content: space-between;
            align-items: center;
            text-transform: uppercase;
        }

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

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

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

        details p {
            padding: 0 20px 20px;
            margin: 0;
            color: var(--muted);
            border-top: 1px solid rgba(255,255,255,0.05);
            padding-top: 15px;
        }

        /* Related Links Grid */
        .related-nav {
            margin: 50px 0;
            padding: 30px;
            background: #0a0202;
            border-radius: 8px;
        }

        .link-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 15px;
            margin-top: 20px;
        }

        .link-grid a {
            display: block;
            background: var(--surface);
            padding: 15px;
            text-align: center;
            font-family: var(--font-display);
            text-transform: uppercase;
            border: 1px solid rgba(255, 107, 0, 0.3);
            border-radius: 4px;
            position: relative;
            overflow: hidden;
            z-index: 1;
        }

        .link-grid a::before {
            content: '';
            position: absolute;
            top: 0; left: -100%; width: 100%; height: 100%;
            background: var(--accent);
            transition: left 0.3s ease;
            z-index: -1;
        }

        .link-grid a:hover::before {
            left: 0;
        }

        .link-grid a:hover {
            color: #000;
            font-weight: bold;
        }

        /* Grand CTA */
        .grand-cta {
            text-align: center;
            padding: 60px 20px;
            background: linear-gradient(45deg, var(--surface) 0%, #3a0d0d 100%);
            border: 2px solid var(--accent);
            border-radius: 12px;
            margin: 60px 0;
            box-shadow: 0 10px 30px rgba(0,0,0,0.5), inset 0 0 20px rgba(255, 107, 0, 0.2);
        }

        .grand-cta h2 {
            justify-content: center;
            font-size: 2.2rem;
            margin-top: 0;
        }

        .grand-cta h2::before { display: none; }

        .cta-buttons {
            display: flex;
            justify-content: center;
            gap: 20px;
            margin-top: 30px;
            flex-wrap: wrap;
        }

        .btn {
            display: inline-block;
            padding: 15px 40px;
            font-family: var(--font-display);
            font-size: 1.2rem;
            text-transform: uppercase;
            font-weight: 700;
            border-radius: 4px;
            text-align: center;
            transform: skewX(-10deg);
            transition: all 0.3s ease;
        }

        .btn span {
            display: inline-block;
            transform: skewX(10deg); /* correct text skew */
        }

        .btn-primary {
            background: var(--accent);
            color: #000;
            box-shadow: 4px 4px 0px var(--accent2);
        }

        .btn-primary:hover {
            background: var(--accent2);
            color: #000;
            transform: skewX(-10deg) translateY(-2px);
            box-shadow: 6px 6px 0px var(--accent);
        }

        .btn-secondary {
            background: transparent;
            color: var(--accent);
            border: 2px solid var(--accent);
        }

        .btn-secondary:hover {
            background: rgba(255, 107, 0, 0.1);
            color: var(--accent2);
            border-color: var(--accent2);
        }

        /* FOOTER (Matches Homepage Family) */
        footer {
            background-color: #0a0202;
            padding: 50px 0 20px;
            border-top: 3px solid var(--surface);
        }

        .footer-top {
            text-align: center;
            margin-bottom: 40px;
        }

        .footer-brand {
            font-family: var(--font-display);
            font-size: 2rem;
            font-weight: 700;
            color: var(--accent);
            text-transform: uppercase;
            margin-bottom: 10px;
        }

        .footer-tagline {
            color: var(--muted);
            max-width: 600px;
            margin: 0 auto;
        }

        .footer-links {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
            gap: 30px;
            margin-bottom: 40px;
            text-align: center;
        }

        .footer-links div {
            display: flex;
            flex-direction: column;
            gap: 10px;
        }

        .footer-links a {
            color: var(--text);
            font-size: 0.95rem;
        }

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

        .footer-bottom {
            text-align: center;
            color: var(--muted);
            font-size: 0.85rem;
            border-top: 1px solid rgba(255,255,255,0.05);
            padding-top: 20px;
        }

        /* Responsive */
        @media (max-width: 768px) {
            .menu-toggle {
                display: block;
            }
            nav ul {
                display: none;
                position: absolute;
                top: 70px;
                left: 0;
                width: 100%;
                background: var(--surface);
                flex-direction: column;
                padding: 20px;
                border-bottom: 2px solid var(--accent);
            }
            nav ul.active {
                display: flex;
            }
            h1 {
                font-size: 1.8rem;
            }
            h2 {
                font-size: 1.4rem;
            }
            .grand-cta h2 {
                font-size: 1.6rem;
            }
            .cta-buttons {
                flex-direction: column;
            }
            .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; }