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

        body {
            font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
            background: #f5f7fb;
            color: #1e2a3a;
            line-height: 1.6;
            padding: 20px;
        }

        .page {
            max-width: 1100px;
            margin: 0 auto;
            background: #ffffff;
            border-radius: 16px;
            box-shadow: 0 8px 30px rgba(0, 0, 0, 0.06);
            overflow: hidden;
            padding: 30px 35px;
        }

        /* ===== 头部 ===== */
        .header {
            text-align: center;
            padding-bottom: 25px;
            border-bottom: 3px solid #1a5276;
            margin-bottom: 30px;
        }

        .header h1 {
            font-size: 32px;
            font-weight: 700;
            color: #1a3a5c;
            letter-spacing: 2px;
        }

        .header h1 span {
            color: #c0392b;
        }

        .header .sub {
            font-size: 16px;
            color: #5d6d7e;
            margin-top: 6px;
            letter-spacing: 4px;
        }

        /* ===== 通用标题 ===== */
        .section-title {
            font-size: 22px;
            font-weight: 700;
            color: #1a3a5c;
            padding-left: 16px;
            border-left: 5px solid #1a5276;
            margin: 35px 0 18px 0;
        }

        .section-title.small {
            font-size: 19px;
            margin-top: 28px;
        }

        /* ===== 城市介绍 ===== */
        .city-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 24px;
            margin-bottom: 8px;
        }

        .city-card {
            background: #f8faff;
            border-radius: 12px;
            padding: 20px 22px;
            border: 1px solid #e9edf4;
            transition: box-shadow 0.2s;
        }

        .city-card:hover {
            box-shadow: 0 4px 14px rgba(26, 82, 118, 0.08);
        }

        .city-card h3 {
            font-size: 20px;
            color: #1a3a5c;
            margin-bottom: 8px;
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .city-card h3 .badge {
            font-size: 14px;
            background: #1a5276;
            color: #fff;
            padding: 0 12px;
            border-radius: 20px;
            font-weight: 400;
        }

        .city-card p {
            font-size: 15px;
            color: #2c3e50;
            margin-top: 6px;
        }

        /* ===== 三体系介绍 ===== */
        .cert-intro {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
            margin: 10px 0 5px;
        }

        .cert-item {
            background: #ffffff;
            border-radius: 12px;
            padding: 18px 18px 20px;
            border: 1px solid #e9edf4;
            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.02);
            transition: transform 0.2s, box-shadow 0.2s;
        }

        .cert-item:hover {
            transform: translateY(-3px);
            box-shadow: 0 8px 20px rgba(26, 82, 118, 0.08);
        }

        .cert-item .icon {
            font-size: 32px;
            display: block;
            margin-bottom: 6px;
        }

        .cert-item h4 {
            font-size: 17px;
            color: #1a3a5c;
            margin-bottom: 6px;
        }

        .cert-item .sub-label {
            font-size: 13px;
            color: #5d6d7e;
            background: #eef2f7;
            display: inline-block;
            padding: 0 12px;
            border-radius: 20px;
            margin-bottom: 8px;
        }

        .cert-item p {
            font-size: 14.5px;
            color: #2c3e50;
            margin-top: 6px;
        }

        /* ===== 证书样本展示 ===== */
        .cert-samples {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 22px;
            margin: 10px 0 5px;
        }

        .cert-sample {
            background: #ffffff;
            border-radius: 12px;
            padding: 16px 16px 18px;
            border: 1px solid #e0e6ef;
            text-align: center;
            transition: box-shadow 0.2s;
        }

        .cert-sample:hover {
            box-shadow: 0 6px 18px rgba(0, 0, 0, 0.06);
        }

        .cert-sample .mock-cert {
            background: linear-gradient(145deg, #fafcfd, #eef3f9);
            border: 2px solid #c5d0df;
            border-radius: 10px;
            padding: 16px 10px 14px;
            position: relative;
            min-height: 160px;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
        }

        .mock-cert .seal {
            font-size: 44px;
            opacity: 0.25;
            position: absolute;
            right: 12px;
            bottom: 12px;
            transform: rotate(-12deg);
        }

        .mock-cert .cert-title {
            font-size: 18px;
            font-weight: 700;
            color: #1a3a5c;
            letter-spacing: 2px;
            border-bottom: 2px solid #b0c4d9;
            padding-bottom: 4px;
            margin-bottom: 6px;
        }

        .mock-cert .cert-body {
            font-size: 13px;
            color: #2c3e50;
            line-height: 1.5;
        }

        .mock-cert .cert-body strong {
            color: #1a5276;
        }

        .mock-cert .cert-footer {
            font-size: 12px;
            color: #5d6d7e;
            margin-top: 6px;
            border-top: 1px dashed #c5d0df;
            padding-top: 6px;
            width: 80%;
        }

        .cert-sample .sample-label {
            font-size: 14px;
            font-weight: 600;
            color: #1a3a5c;
            margin-top: 10px;
        }

        /* ===== 友情链接 ===== */
        .friend-links {
            background: #f8faff;
            border-radius: 12px;
            padding: 16px 22px;
            margin: 15px 0 5px;
            border: 1px solid #e9edf4;
        }

        .friend-links .links-wrap {
            display: flex;
            flex-wrap: wrap;
            gap: 8px 24px;
            align-items: center;
        }

        .friend-links .links-wrap a {
            font-size: 12px;
            color: #2c6b9e;
            text-decoration: none;
            transition: color 0.15s;
        }

        .friend-links .links-wrap a:hover {
            color: #c0392b;
            text-decoration: underline;
        }

        .friend-links .links-wrap .sep {
            font-size: 12px;
            color: #b0c4d9;
        }

        /* ===== 底部 ===== */
        .footer {
            margin-top: 40px;
            padding-top: 22px;
            border-top: 2px solid #e9edf4;
            text-align: center;
            font-size: 14px;
            color: #3d4f62;
        }

        .footer .company {
            font-size: 17px;
            font-weight: 600;
            color: #1a3a5c;
            margin-bottom: 4px;
        }

        .footer .company a {
            color: #1a5276;
            text-decoration: none;
            border-bottom: 1px dotted #b0c4d9;
        }

        .footer .company a:hover {
            color: #c0392b;
            border-bottom-color: #c0392b;
        }

        .footer .contact-info {
            font-size: 14px;
            color: #3d4f62;
            margin-top: 4px;
            letter-spacing: 0.5px;
        }

        .footer .contact-info span {
            margin: 0 10px;
            color: #b0c4d9;
        }

        .footer .copyright {
            font-size: 12px;
            color: #7f8fa3;
            margin-top: 10px;
        }

        /* ===== 响应式 ===== */
        @media (max-width: 860px) {
            .page {
                padding: 20px 18px;
            }

            .city-grid {
                grid-template-columns: 1fr;
            }

            .cert-intro {
                grid-template-columns: 1fr;
            }

            .cert-samples {
                grid-template-columns: 1fr;
                gap: 18px;
            }

            .header h1 {
                font-size: 26px;
            }

            .header .sub {
                font-size: 14px;
                letter-spacing: 2px;
            }

            .section-title {
                font-size: 20px;
            }

            .footer .company {
                font-size: 16px;
            }
        }

        @media (max-width: 480px) {
            body {
                padding: 10px;
            }

            .page {
                padding: 16px 12px;
                border-radius: 10px;
            }

            .header h1 {
                font-size: 22px;
            }

            .header .sub {
                font-size: 13px;
                letter-spacing: 1px;
            }

            .city-card {
                padding: 16px 16px;
            }

            .city-card h3 {
                font-size: 18px;
            }

            .cert-item {
                padding: 14px 14px 16px;
            }

            .mock-cert .cert-title {
                font-size: 16px;
            }

            .footer .contact-info span {
                margin: 0 4px;
            }
        }