/* ====== 设计变量 黑金商务 ====== */
        :root {
            --main: #eab308;
            --accent: #f59e0b;
            --bg-deep: #18181b;
            --text-light: #fafafa;
            --card-bg: #202023;
            --border-line: #3f3f46;
            --radius: 8px;
            --shadow-soft: 0 8px 20px rgba(0,0,0,0.4);
            --font-head: 'Inter', sans-serif;
        }

        body {
            background-color: var(--bg-deep);
            color: var(--text-light);
            font-family: var(--font-head);
            line-height: 1.6;
            overflow-x: hidden;
        }

        /* 细点阵背景装饰 */
        body::before {
            content: "";
            position: fixed;
            inset: 0;
            background-image: radial-gradient(var(--border-line) 1px, transparent 1px);
            background-size: 28px 28px;
            opacity: 0.2;
            pointer-events: none;
            z-index: 0;
        }

        /* 顶部滚动进度条 */
        #progress-bar {
            position: fixed;
            top: 0;
            left: 0;
            height: 3px;
            width: 0%;
            background: linear-gradient(90deg, var(--main), var(--accent));
            z-index: 9999;
            transition: width 0.08s ease-out;
            box-shadow: 0 0 10px var(--accent);
        }

        /* 导航 */
        .navbar {
            background: rgba(24, 24, 27, 0.9);
            backdrop-filter: blur(10px);
            border-bottom: 1px solid var(--border-line);
            z-index: 1050;
            padding: 0.8rem 0;
        }
        .navbar-brand {
            font-weight: 800;
            font-size: 1.5rem;
            color: var(--main) !important;
            letter-spacing: -0.5px;
        }
        .navbar-nav .nav-link {
            color: var(--text-light) !important;
            font-weight: 500;
            padding: 0.5rem 1rem;
            border-radius: 30px;
            transition: all 0.2s;
        }
        .navbar-nav .nav-link:hover {
            color: var(--main) !important;
            background: rgba(234, 179, 8, 0.08);
        }

        /* 布局：左侧固定侧栏 + 右侧内容 */
        .sidebar-layout {
            display: flex;
            align-items: flex-start;
            gap: 2rem;
            margin-top: 2rem;
        }
        .left-sidebar {
            flex: 0 0 240px;
            position: sticky;
            top: 100px;
            border-right: 1px solid var(--border-line);
            padding-right: 1rem;
            display: block;
        }
        .right-content {
            flex: 1;
            min-width: 0;
        }

        /* 卡片瀑布流 */
        .masonry-grid {
            column-count: 3;
            column-gap: 1.5rem;
        }
        .masonry-card {
            break-inside: avoid;
            margin-bottom: 1.5rem;
            background: var(--card-bg);
            border: 1px solid var(--border-line);
            border-radius: var(--radius);
            box-shadow: var(--shadow-soft);
            transition: transform 0.2s ease, border-color 0.2s ease;
            overflow: hidden;
        }
        .masonry-card:hover {
            transform: scale(1.02);
            border-color: var(--main);
        }
        .masonry-card img {
            width: 100%;
            height: auto;
            display: block;
            border-bottom: 1px solid var(--border-line);
        }
        .card-body {
            padding: 1rem;
        }
        .badge-hot {
            background: var(--accent);
            color: #18181b;
            font-weight: 700;
            font-size: 0.7rem;
            padding: 0.3rem 0.8rem;
            border-radius: 30px;
        }

        /* 标题风格 */
        h1, h2, h3, .display-title {
            font-weight: 900;
            letter-spacing: -0.02em;
            color: var(--text-light);
        }
        h2 {
            font-size: 2.2rem;
            margin-bottom: 1.2rem;
            border-left: 6px solid var(--main);
            padding-left: 1rem;
        }

        /* 大数字等宽 */
        .mono-stats {
            font-family: 'Courier New', monospace;
            font-weight: 700;
            color: var(--main);
            font-size: 3.2rem;
            line-height: 1;
        }

        /* Hero 背景视差 */
        .hero-section {
            position: relative;
            background: linear-gradient(145deg, #1d1d20, #0f0f10);
            padding: 4rem 0;
            background-attachment: fixed;
            background-size: cover;
            border-bottom: 1px solid var(--border-line);
        }
        .hero-section::after {
            content: "";
            position: absolute;
            inset: 0;
            background: radial-gradient(circle at 20% 50%, rgba(234,179,8,0.15), transparent 60%);
            pointer-events: none;
        }

        /* 对比表格 */
        .compare-table {
            width: 100%;
            border-collapse: separate;
            border-spacing: 0 12px;
        }
        .compare-table th, .compare-table td {
            background: var(--card-bg);
            border: 1px solid var(--border-line);
            padding: 1rem 1.2rem;
        }
        .compare-table th {
            background: #2a2a2e;
            font-weight: 700;
            color: var(--main);
            width: 30%;
        }

        /* 编号清单 */
        .steps-list {
            list-style: none;
            counter-reset: step-counter;
            padding: 0;
        }
        .steps-list li {
            counter-increment: step-counter;
            position: relative;
            padding: 0.8rem 0 0.8rem 3.5rem;
            border-bottom: 1px dashed var(--border-line);
        }
        .steps-list li::before {
            content: counter(step-counter);
            background: var(--main);
            color: #18181b;
            font-weight: 800;
            width: 2.2rem;
            height: 2.2rem;
            border-radius: var(--radius);
            display: inline-flex;
            align-items: center;
            justify-content: center;
            position: absolute;
            left: 0;
            top: 0.8rem;
        }

        /* 页脚 */
        footer {
            border-top: 1px solid var(--border-line);
            background: #121214;
            padding: 2rem 0 1rem;
            margin-top: 3rem;
        }

        .footer-links a {
            color: var(--text-light);
            opacity: 0.7;
            margin-right: 1.5rem;
            text-decoration: none;
        }
        .footer-links a:hover {
            opacity: 1;
            color: var(--main);
        }

        /* 按钮/CTA */
        .btn-gold {
            background: var(--main);
            color: #18181b;
            font-weight: 800;
            padding: 0.7rem 1.8rem;
            border-radius: 50px;
            border: none;
            transition: 0.2s;
        }
        .btn-gold:hover {
            background: var(--accent);
            transform: translateY(-2px);
            box-shadow: 0 10px 20px rgba(234,179,8,0.3);
        }

        /* 移动端折叠侧栏 */
        @media (max-width: 992px) {
            .sidebar-layout {
                flex-direction: column;
            }
            .left-sidebar {
                position: static;
                flex: none;
                width: 100%;
                border-right: none;
                border-bottom: 1px solid var(--border-line);
                padding-bottom: 1rem;
            }
            .masonry-grid {
                column-count: 2;
            }
        }
        @media (max-width: 600px) {
            .masonry-grid {
                column-count: 1;
            }
        }

        /* 友情链接区 */
        .friend-links {
            background: #1c1c1e;
            padding: 1.5rem 0;
            border-bottom: 1px solid var(--border-line);
        }
        .friend-links h5 {
            color: var(--main);
            font-weight: 700;
        }

/* --- Bootstrap 组件配色适配(程序自动补,避免白底黑字) --- */
.accordion-item { background:rgba(255,255,255,.04) !important; color:#fafafa !important; border-color:rgba(255,255,255,.12) !important; }
.accordion-button { background:rgba(255,255,255,.04) !important; color:#fafafa !important; }
.accordion-body { background:transparent !important; color:#fafafa !important; }
.accordion-header { background:transparent !important; }
.accordion-button::after { filter: invert(1) grayscale(1) brightness(2); }