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

        body {
            font-family: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, Helvetica, sans-serif;
            background: #f7fafd;
            color: #1e293b;
            line-height: 1.5;
        }

        .bg-soft {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            pointer-events: none;
            z-index: -2;
            background: linear-gradient(145deg, #ecf3f9 0%, #f6faff 100%);
        }

        .container {
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 32px;
        }

        .navbar {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 24px 0;
            flex-wrap: wrap;
        }

        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .logo-icon {
            width: 40px;
            height: 40px;
            background: #1e3a6f;
            border-radius: 20px;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: 0 8px 20px rgba(30,58,111,0.15);
        }

        .logo-text {
            font-size: 1.8rem;
            font-weight: 800;
            color: #0a2b4e;
            letter-spacing: -0.3px;
        }

        .nav-links {
            display: flex;
            gap: 36px;
            align-items: center;
            flex-wrap: wrap;
        }

        .nav-links a {
            color: #334155;
            text-decoration: none;
            font-weight: 500;
            transition: color 0.2s;
            font-size: 1rem;
        }

        .nav-links a:hover, .nav-links a.active {
            color: #1e6f5c;
        }

        .page-header {
            text-align: center;
            padding: 56px 0 32px;
        }

        .page-header h1 {
            font-size: 3rem;
            font-weight: 800;
            background: linear-gradient(135deg, #0a2b4e, #1e6f5c);
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
            margin-bottom: 16px;
        }

        .page-header p {
            color: #54708f;
            font-size: 1.1rem;
            max-width: 680px;
            margin: 0 auto;
        }

        /* 两栏布局：侧边目录 + 内容区 */
        .guide-layout {
            display: flex;
            gap: 48px;
            margin: 32px 0 64px;
            flex-wrap: wrap;
        }

        .sidebar {
            flex: 0 0 260px;
            position: sticky;
            top: 32px;
            align-self: flex-start;
            background: white;
            border-radius: 28px;
            padding: 24px 16px;
            box-shadow: 0 8px 20px rgba(0,0,0,0.02);
            border: 1px solid #e2edf5;
        }

        .sidebar h4 {
            font-size: 1rem;
            text-transform: uppercase;
            letter-spacing: 1px;
            color: #7e95b0;
            margin-bottom: 20px;
            padding-left: 12px;
        }

        .sidebar-nav {
            display: flex;
            flex-direction: column;
            gap: 6px;
        }

        .sidebar-nav a {
            display: block;
            padding: 10px 16px;
            color: #3b5a7c;
            text-decoration: none;
            border-radius: 16px;
            font-weight: 500;
            transition: all 0.2s;
        }

        .sidebar-nav a:hover {
            background: #eef4fa;
            color: #1e6f5c;
        }

        .sidebar-nav a.active-guide {
            background: #1e6f5c10;
            color: #1e6f5c;
            border-left: 3px solid #1e6f5c;
        }

        .content-area {
            flex: 1;
            min-width: 260px;
        }

        .guide-block {
            background: white;
            border-radius: 36px;
            padding: 32px 36px;
            margin-bottom: 40px;
            border: 1px solid #eaf0f6;
            box-shadow: 0 4px 14px rgba(0,0,0,0.02);
            scroll-margin-top: 90px;
        }

        .guide-block h2 {
            font-size: 1.8rem;
            margin-bottom: 24px;
            color: #0f2c47;
            display: flex;
            align-items: center;
            gap: 12px;
            border-left: 4px solid #1e6f5c;
            padding-left: 20px;
        }

        .step-list {
            display: flex;
            flex-direction: column;
            gap: 28px;
        }

        .step {
            display: flex;
            gap: 18px;
            align-items: flex-start;
        }

        .step-marker {
            width: 36px;
            height: 36px;
            background: #eef3fa;
            border-radius: 40px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 800;
            color: #1e6f5c;
            flex-shrink: 0;
        }

        .step-content h3 {
            font-size: 1.2rem;
            margin-bottom: 6px;
            color: #1a3857;
        }

        .step-content p {
            color: #5b6f8c;
        }

        .tip-box {
            background: #eef7f4;
            padding: 18px 24px;
            border-radius: 24px;
            margin-top: 28px;
            border-left: 4px solid #1e6f5c;
            color: #2c5a4b;
        }

        .footer {
            border-top: 1px solid #dce5ef;
            padding: 48px 0 32px;
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            gap: 32px;
            margin-top: 20px;
        }

        .footer-copyright {
            font-size: 0.85rem;
            color: #6f8aaa;
        }

        .footer-links a {
            color: #4a6f8f;
            text-decoration: none;
            margin-left: 32px;
            font-size: 0.9rem;
        }

        .footer-links a:hover {
            color: #1e6f5c;
        }

        @media (max-width: 860px) {
            .guide-layout {
                flex-direction: column;
            }
            .sidebar {
                position: static;
                width: 100%;
            }
            .sidebar-nav {
                flex-direction: row;
                flex-wrap: wrap;
            }
            .guide-block {
                padding: 24px;
            }
            .navbar {
                flex-direction: column;
                gap: 16px;
            }
        }

        @media (max-width: 560px) {
            .step {
                flex-direction: column;
            }
        }