:root {
            --color-primary: #c41e3a;
            --color-primary-dark: #a01830;
            --color-gold: #ffd700;
            --color-text: #333333;
            --color-text-secondary: #666666;
            --color-text-light: #999999;
            --color-bg: #f5f6f8;
            --color-bg-card: #ffffff;
            --color-border: #e8e8e8;
            --color-accent: #fef6f0;
            --color-accent-blue: #f0f6ff;
            --shadow-card: 0 2px 12px rgba(0,0,0,0.06);
            --shadow-hover: 0 6px 24px rgba(0,0,0,0.10);
            --radius: 8px;
            --max-width: 1100px;
            --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
        }
        * { margin: 0; padding: 0; box-sizing: border-box; }
        html { font-size: 16px; -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
        body {
            font-family: var(--font-family);
            font-size: 15px; line-height: 1.8; color: var(--color-text);
            background: var(--color-bg); min-width: 320px;
            -webkit-font-smoothing: antialiased;
        }
        a { color: var(--color-primary); text-decoration: none; transition: color 0.2s; }
        a:hover { color: var(--color-primary-dark); }
        img { max-width: 100%; height: auto; display: block; }
        ul, ol { list-style: none; }

        /* ====== Header ====== */
        .header {
            background: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
            color: #fff; padding: 56px 0 44px; text-align: center;
            position: relative; overflow: hidden;
        }
        .header::before {
            content: ''; position: absolute; top: -50%; left: -50%;
            width: 200%; height: 200%;
            background: radial-gradient(circle at 30% 50%, rgba(196,30,58,0.18) 0%, transparent 60%),
                        radial-gradient(circle at 70% 50%, rgba(255,215,0,0.08) 0%, transparent 60%);
        }
        .header-inner { position: relative; z-index: 1; max-width: var(--max-width); margin: 0 auto; padding: 0 20px; }
        .header .badge {
            display: inline-block; background: var(--color-primary); color: #fff;
            font-size: 12px; padding: 4px 14px; border-radius: 20px; margin-bottom: 16px;
            letter-spacing: 2px; font-weight: 500;
        }
        .header h1 {
            font-size: 34px; font-weight: 700; letter-spacing: 1px;
            margin-bottom: 14px; line-height: 1.3;
        }
        .header h1 .hl { color: var(--color-gold); }
        .header .subtitle {
            font-size: 16px; opacity: 0.85; font-weight: 300;
            max-width: 680px; margin: 0 auto 28px; line-height: 1.7;
        }
        .header .quick-answer {
            display: inline-block; background: rgba(255,255,255,0.1);
            border: 1px solid rgba(255,255,255,0.2); border-radius: 40px;
            padding: 10px 28px; font-size: 15px;
        }
        .header .quick-answer strong {
            color: var(--color-gold); font-size: 22px; margin: 0 4px;
        }

        /* ====== Breadcrumb ====== */
        .breadcrumb-wrap { background: #fff; border-bottom: 1px solid var(--color-border); }
        .breadcrumb {
            max-width: var(--max-width); margin: 0 auto; padding: 12px 20px;
            font-size: 13px; color: var(--color-text-light);
            display: flex; align-items: center; flex-wrap: wrap; gap: 6px;
        }
        .breadcrumb a { color: var(--color-text-secondary); }
        .breadcrumb .separator { color: #ccc; user-select: none; }
        .breadcrumb .current { color: var(--color-text); font-weight: 500; }

        /* ====== Main Layout ====== */
        .main-container { max-width: var(--max-width); margin: 0 auto; padding: 24px 20px; display: flex; gap: 24px; }
        .content-area { flex: 1; min-width: 0; }
        .sidebar { width: 320px; flex-shrink: 0; }

        /* ====== Cards ====== */
        .card {
            background: var(--color-bg-card); border-radius: var(--radius);
            box-shadow: var(--shadow-card); padding: 30px 32px; margin-bottom: 20px;
        }

        /* ====== Section Title ====== */
        .section-title {
            font-size: 22px; font-weight: 700; color: #1a1a2e;
            margin-bottom: 22px; padding-bottom: 14px;
            border-bottom: 2px solid var(--color-primary);
            position: relative; display: flex; align-items: center; gap: 10px;
        }
        .section-title::after {
            content: ''; position: absolute; bottom: -2px; left: 0;
            width: 60px; height: 2px; background: var(--color-gold);
        }
        .section-title .icon { font-size: 24px; }

        /* ====== Intro ====== */
        .intro-text { color: var(--color-text-secondary); }
        .intro-text p { margin-bottom: 12px; text-indent: 2em; }
        .intro-text p:last-child { margin-bottom: 0; }
        .highlight-banner {
            background: var(--color-accent);
            border-left: 4px solid var(--color-primary);
            border-radius: 6px; padding: 16px 20px; margin: 18px 0;
            font-size: 15px; color: var(--color-text); font-weight: 500;
        }
        .highlight-banner strong { color: var(--color-primary); }

        /* ====== Price Table ====== */
        .price-table-wrap { overflow-x: auto; margin: 20px 0; }
        .price-table { width: 100%; border-collapse: collapse; font-size: 14px; min-width: 560px; }
        .price-table thead th {
            background: #1a1a2e; color: #fff; padding: 13px 14px;
            text-align: center; font-weight: 600; white-space: nowrap;
        }
        .price-table tbody td {
            padding: 11px 14px; border-bottom: 1px solid var(--color-border);
            text-align: center; color: var(--color-text-secondary);
        }
        .price-table tbody tr:nth-child(even) { background: #fafafa; }
        .price-table tbody tr:hover { background: var(--color-accent); }
        .price-table .city-name { font-weight: 600; color: #1a1a2e; text-align: left; }
        .price-table .price-highlight { color: var(--color-primary); font-weight: 700; font-size: 15px; }

        /* ====== Cost Cards ====== */
        .cost-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 16px; margin: 20px 0; }
        .cost-card {
            background: #fafafa; border-radius: var(--radius); padding: 22px 20px;
            border: 1px solid var(--color-border); transition: all 0.3s;
        }
        .cost-card:hover { box-shadow: var(--shadow-hover); border-color: var(--color-primary); }
        .cost-card .cost-num {
            width: 42px; height: 42px; border-radius: 50%; background: var(--color-primary);
            color: #fff; font-size: 18px; font-weight: 700; line-height: 42px;
            text-align: center; margin-bottom: 14px; display: block;
        }
        .cost-card h4 { font-size: 16px; font-weight: 600; color: #1a1a2e; margin-bottom: 8px; }
        .cost-card p { font-size: 13px; color: var(--color-text-light); line-height: 1.75; margin-bottom: 6px; }
        .cost-tag {
            display: inline-block; background: #fff3f3; color: var(--color-primary);
            font-weight: 700; padding: 2px 8px; border-radius: 4px; margin: 2px 2px; font-size: 12px;
        }

        /* ====== Warning Box ====== */
        .warning-box {
            background: linear-gradient(135deg, #fff5f5 0%, #ffe8e8 100%);
            border: 1px solid #ffcccc; border-left: 5px solid #e53e3e;
            border-radius: var(--radius); padding: 22px 26px; margin: 20px 0;
        }
        .warning-box h4 { color: #c53030; font-size: 17px; font-weight: 700; margin-bottom: 12px; display: flex; align-items: center; gap: 8px; }
        .warning-box ul { list-style: disc; padding-left: 20px; color: var(--color-text-secondary); font-size: 14px; line-height: 2.2; }
        .warning-box ul li strong { color: #c53030; }

        /* ====== Compare Cards ====== */
        .compare-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; margin: 20px 0; }
        .compare-card { border-radius: var(--radius); padding: 26px; border: 2px solid var(--color-border); transition: all 0.3s; }
        .compare-card:hover { transform: translateY(-3px); }
        .compare-card.diy { background: #fafafa; border-color: #e0e0e0; }
        .compare-card.agency { background: linear-gradient(135deg, #f0f6ff 0%, #e8f0fe 100%); border-color: #4a90d9; }
        .compare-card h4 { font-size: 18px; font-weight: 700; margin-bottom: 14px; display: flex; align-items: center; gap: 8px; }
        .compare-card.diy h4 { color: #666; }
        .compare-card.agency h4 { color: #2b6cb0; }
        .compare-list li {
            padding: 9px 0; border-bottom: 1px dashed var(--color-border);
            font-size: 14px; color: var(--color-text-secondary);
            display: flex; align-items: flex-start; gap: 8px;
        }
        .compare-list li:last-child { border-bottom: none; }
        .icon-check { color: #38a169; flex-shrink: 0; font-weight: 700; }
        .icon-cross { color: #e53e3e; flex-shrink: 0; font-weight: 700; }
        .compare-price {
            text-align: center; margin-top: 18px; padding-top: 16px;
            border-top: 1px solid var(--color-border); font-size: 24px; font-weight: 700;
        }
        .compare-card.diy .compare-price { color: #e53e3e; }
        .compare-card.agency .compare-price { color: #2b6cb0; }
        .compare-price small { font-size: 13px; font-weight: 400; color: var(--color-text-light); display: block; margin-top: 4px; }

        /* ====== Category Price Tabs ====== */
        .category-prices { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 12px; margin: 16px 0; }
        .cat-price-item {
            background: #fafafa; border-radius: var(--radius); padding: 16px 18px;
            border: 1px solid var(--color-border); text-align: center; transition: all 0.3s;
        }
        .cat-price-item:hover { border-color: var(--color-primary); box-shadow: var(--shadow-hover); }
        .cat-price-item .cat-name { font-size: 14px; font-weight: 600; color: #1a1a2e; margin-bottom: 6px; }
        .cat-price-item .cat-cost { font-size: 20px; font-weight: 700; color: var(--color-primary); }
        .cat-price-item .cat-note { font-size: 11px; color: var(--color-text-light); margin-top: 4px; }

        /* ====== Steps ====== */
        .steps { display: flex; gap: 0; flex-wrap: wrap; }
        .step-item {
            flex: 1; min-width: 160px; text-align: center;
            padding: 18px 12px; position: relative;
        }
        .step-item::after {
            content: '→'; position: absolute; right: -6px; top: 50%;
            transform: translateY(-50%); font-size: 20px; color: #ccc; font-weight: 700;
        }
        .step-item:last-child::after { display: none; }
        .step-num {
            width: 46px; height: 46px; border-radius: 50%; background: var(--color-primary);
            color: #fff; font-size: 20px; font-weight: 700; line-height: 46px;
            margin: 0 auto 10px; display: block;
        }
        .step-item h5 { font-size: 15px; color: #1a1a2e; margin-bottom: 4px; }
        .step-item p { font-size: 12px; color: var(--color-text-light); line-height: 1.5; }

        /* ====== FAQ ====== */
        .faq-list { display: flex; flex-direction: column; gap: 12px; }
        .faq-item { border: 1px solid var(--color-border); border-radius: var(--radius); overflow: hidden; transition: border-color 0.3s; }
        .faq-item:hover { border-color: var(--color-primary); }
        .faq-item.open { border-color: var(--color-primary); }
        .faq-question {
            padding: 16px 20px; font-weight: 600; font-size: 15px;
            cursor: pointer; display: flex; align-items: center; justify-content: space-between;
            background: #fafafa; color: #1a1a2e; user-select: none;
        }
        .faq-question .q-icon { color: var(--color-primary); margin-right: 10px; font-weight: 700; flex-shrink: 0; }
        .faq-question .arrow { transition: transform 0.3s; font-size: 12px; color: var(--color-text-light); flex-shrink: 0; }
        .faq-answer {
            padding: 0 20px; max-height: 0; overflow: hidden;
            transition: max-height 0.35s ease, padding 0.35s ease;
            color: var(--color-text-secondary); font-size: 14px; line-height: 1.9;
        }
        .faq-item.open .faq-answer { max-height: 400px; padding: 18px 20px; }
        .faq-item.open .arrow { transform: rotate(180deg); }

        /* ====== Article Source ====== */
        .article-source {
            margin-top: 24px; padding: 14px 18px; background: #f9f9f9;
            border-radius: 6px; font-size: 12px; color: var(--color-text-light);
            display: flex; align-items: center; flex-wrap: wrap; gap: 12px;
        }
        .article-source a { color: var(--color-primary); font-size: 12px; }

        /* ====== Sidebar ====== */
        .sidebar .card { padding: 22px; }
        .sidebar-title {
            font-size: 17px; font-weight: 700; color: #1a1a2e;
            margin-bottom: 14px; padding-bottom: 10px; border-bottom: 2px solid var(--color-primary);
        }
        .sidebar-nav li { border-bottom: 1px dashed var(--color-border); }
        .sidebar-nav li:last-child { border-bottom: none; }
        .sidebar-nav a {
            display: flex; align-items: center; justify-content: space-between;
            padding: 11px 0; font-size: 14px; color: var(--color-text-secondary); transition: color 0.2s;
        }
        .sidebar-nav a:hover { color: var(--color-primary); text-decoration: none; }
        .sidebar-nav .nav-arrow { color: #ccc; font-size: 12px; }

        .sidebar-tags { display: flex; flex-wrap: wrap; gap: 8px; }
        .sidebar-tags .tag {
            display: inline-block; padding: 5px 12px; font-size: 12px;
            background: #f5f6f8; border-radius: 20px; color: var(--color-text-secondary);
            transition: all 0.2s; white-space: nowrap;
        }
        .sidebar-tags .tag:hover { background: var(--color-primary); color: #fff; }

        .cta-card {
            background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
            color: #fff;
        }
        .cta-card .sidebar-title { color: #fff; border-bottom-color: rgba(255,255,255,0.3); }
        .cta-info { font-size: 14px; line-height: 2.2; margin-bottom: 14px; }
        .cta-btn {
            display: block; text-align: center; background: var(--color-gold); color: #1a1a2e;
            font-weight: 700; padding: 12px; border-radius: 6px; font-size: 15px; transition: background 0.3s;
        }
        .cta-btn:hover { background: #ffed4a; text-decoration: none; color: #1a1a2e; }

        /* ====== Footer ====== */
        .footer {
            background: #1a1a2e; color: #999; padding: 32px 20px;
            text-align: center; font-size: 13px; line-height: 2; margin-top: 20px;
        }
        .footer a { color: #ccc; }
        .footer .footer-links { display: flex; justify-content: center; flex-wrap: wrap; gap: 20px; margin-bottom: 12px; }
        .footer .divider { color: #555; }

        /* ====== Responsive ====== */
        @media (max-width: 1024px) {
            .main-container { flex-direction: column; }
            .sidebar { width: 100%; }
        }
        @media (max-width: 768px) {
            .header h1 { font-size: 24px; }
            .card { padding: 18px 16px; }
            .section-title { font-size: 18px; }
            .compare-grid { grid-template-columns: 1fr; }
            .cost-grid { grid-template-columns: 1fr; }
            .category-prices { grid-template-columns: repeat(2, 1fr); }
            .steps { flex-direction: column; }
            .step-item::after { content: '↓'; right: 50%; top: auto; bottom: -6px; transform: translateX(50%); }
        }
        @media (max-width: 480px) {
            .header { padding: 36px 0 28px; }
            .header h1 { font-size: 20px; }
            .header .quick-answer { font-size: 13px; padding: 8px 18px; }
            .header .quick-answer strong { font-size: 18px; }
        }
        @media print {
            .sidebar, .header, .footer, .breadcrumb-wrap { display: none; }
            .card { box-shadow: none; border: 1px solid #ddd; break-inside: avoid; }
        }