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

        body {
            font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
            color: #1a1a2e;
            background: #ffffff;
            line-height: 1.6;
            overflow-x: hidden;
        }

        a {
            text-decoration: none;
            color: inherit;
        }

        ul {
            list-style: none;
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ===== 主色 ===== */
        :root {
            --primary: #65B530;
            --primary-dark: #4d8a24;
            --primary-light: #8ace5a;
            --primary-bg: #f0f8ea;
            --primary-gradient: linear-gradient(135deg, #65B530 0%, #4d8a24 100%);
            --dark: #0f172a;
            --gray: #64748b;
            --light-gray: #f8fafc;
            --border: #e2e8f0;
            --shadow: 0 4px 24px rgba(0, 0, 0, 0.06);
            --shadow-hover: 0 16px 48px rgba(0, 0, 0, 0.10);
            --radius: 16px;
            --transition: 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
            /* 文章页专用变量 */
            --gray-bg: #f5f7fa;
            --border-light: #eef2f6;
            --text-muted: #5e6f7e;
            --primary-soft: #f0f9e9;
            /* 案例页专用变量 */
            --card-radius: 16px;
            --shadow-sm: 0 2px 12px rgba(0, 0, 0, 0.04);
            --shadow-md: 0 8px 32px rgba(0, 0, 0, 0.07);
            --content-width: 1000px;
        }

        /* ============================================================
                   导航 — 字号加大加粗
                   ============================================================ */
        .navbar {
            background: #ffffff;
            padding: 14px 0;
            position: sticky;
            top: 0;
            z-index: 1000;
            transition: box-shadow 0.4s, background 0.4s;
            box-shadow: 0 1px 0 rgba(0, 0, 0, 0.04);
        }
        .navbar.scrolled {
            box-shadow: 0 4px 30px rgba(0, 0, 0, 0.08);
            background: rgba(255, 255, 255, 0.96);
            backdrop-filter: blur(10px);
        }
        .navbar .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
        }
        .navbar .logo {
            font-size: 1.7rem;
            font-weight: 800;
            color: var(--dark);
            display: flex;
            align-items: center;
            gap: 8px;
            letter-spacing: -0.5px;
        }
        .navbar .logo i {
            color: var(--primary);
            font-size: 1.6rem;
        }
        .navbar .logo span {
            color: var(--primary);
        }

        /* 导航链接 — 字号大、加粗 */
        .navbar .nav-links {
            display: flex;
            align-items: center;
            gap: 36px;
        }
        .navbar .nav-links a {
            color: #334155;
            font-size: 1.1rem;
            font-weight: 700;
            transition: color 0.3s;
            position: relative;
            padding: 4px 0;
            letter-spacing: 0.2px;
        }
        .navbar .nav-links a::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 0;
            width: 0;
            height: 3px;
            background: var(--primary);
            transition: width 0.35s ease;
            border-radius: 4px;
        }
        .navbar .nav-links a:hover {
            color: var(--primary);
        }
        .navbar .nav-links a:hover::after {
            width: 100%;
        }
        .navbar .nav-links .btn-nav {
            background: var(--primary-gradient);
            color: #fff;
            padding: 12px 32px;
            border-radius: 50px;
            font-weight: 700;
            font-size: 1rem;
            box-shadow: 0 4px 16px rgba(101, 181, 48, 0.30);
            transition: transform 0.3s, box-shadow 0.3s;
            letter-spacing: 0.3px;
        }
        .navbar .nav-links .btn-nav:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 28px rgba(101, 181, 48, 0.40);
            color: #fff;
        }
        .navbar .nav-links .btn-nav::after {
            display: none;
        }

        .nav-toggle {
            display: none;
            flex-direction: column;
            gap: 5px;
            cursor: pointer;
            padding: 4px;
        }
        .nav-toggle span {
            display: block;
            width: 28px;
            height: 3px;
            background: var(--dark);
            border-radius: 4px;
            transition: all 0.3s;
        }
        .nav-toggle.active span:nth-child(1) {
            transform: rotate(45deg) translate(5px, 5px);
        }
        .nav-toggle.active span:nth-child(2) {
            opacity: 0;
        }
        .nav-toggle.active span:nth-child(3) {
            transform: rotate(-45deg) translate(5px, -5px);
        }

     

        /* ============================================================
                   通用标题
                   ============================================================ */
        .section-header {
            text-align: center;
            margin-bottom: 48px;
        }
        .section-header .tag {
            display: inline-block;
            background: var(--primary-bg);
            color: var(--primary-dark);
            font-size: 0.75rem;
            font-weight: 700;
            padding: 4px 16px;
            border-radius: 50px;
            letter-spacing: 1px;
            text-transform: uppercase;
            margin-bottom: 12px;
        }
        .section-header h2 {
            font-size: 2.6rem;
            font-weight: 800;
            color: var(--dark);
            margin-bottom: 10px;
            letter-spacing: -0.3px;
        }
        .section-header h2 span {
            color: var(--primary);
            position: relative;
        }
        .section-header h2 span::after {
            content: '';
            position: absolute;
            bottom: 2px;
            left: 0;
            width: 100%;
            height: 4px;
            background: var(--primary);
            opacity: 0.15;
            border-radius: 4px;
        }
        .section-header p {
            color: var(--gray);
            font-size: 1.05rem;
            max-width: 560px;
            margin: 0 auto;
        }

     
        /* ============================================================
                   页脚
                   ============================================================ */
        .footer {
            background: var(--dark);
            color: #94a3b8;
            padding: 0 0 20px;
        }
        .footer .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            padding: 50px 0 40px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
        }
        .footer .footer-brand {
            font-size: 1.4rem;
            font-weight: 700;
            color: #ffffff;
            display: flex;
            align-items: center;
            gap: 8px;
            margin-bottom: 12px;
        }
        .footer .footer-brand i {
            color: var(--primary);
            font-size: 1.3rem;
        }
        .footer .footer-brand span {
            color: var(--primary);
        }
        .footer-col p {
            color: #94a3b8;
            line-height: 1.8;
            margin-bottom: 16px;
            font-size: 0.9rem;
        }
        .footer-col h4 {
            color: #ffffff;
            font-size: 0.95rem;
            font-weight: 700;
            margin-bottom: 16px;
            letter-spacing: 0.3px;
        }
        .footer-col ul li {
            margin-bottom: 10px;
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 0.88rem;
            color: #94a3b8;
        }
        .footer-col ul li i {
            width: 20px;
            color: var(--primary);
            font-size: 0.9rem;
        }
        .footer-col ul li a {
            color: #94a3b8;
            transition: color 0.3s;
        }
        .footer-col ul li a:hover {
            color: var(--primary);
        }

        .social-icons {
            display: flex;
            gap: 12px;
            margin-top: 8px;
        }
        .social-icons a {
            background: rgba(255, 255, 255, 0.06);
            width: 38px;
            height: 38px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            color: #94a3b8;
            font-size: 1rem;
            transition: background 0.3s, color 0.3s, transform 0.3s;
        }
        .social-icons a:hover {
            background: var(--primary);
            color: #fff;
            transform: translateY(-3px);
        }

        .qr-code {
            background: #ffffff;
            width: 96px;
            height: 96px;
            border-radius: 12px;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            color: var(--dark);
            font-size: 0.65rem;
            gap: 2px;
            box-shadow: 0 4px 16px rgba(0, 0, 0, 0.20);
            transition: transform 0.3s;
        }
        .qr-code:hover {
            transform: scale(1.04);
        }
        .qr-code i {
            font-size: 2.6rem;
            color: var(--dark);
        }
        .qr-code span {
            font-weight: 600;
            color: #475569;
        }
      .qr-code img{
            width:100%;
           height:100%;
       }
        .footer-bottom {
            text-align: center;
            padding-top: 20px;
            font-size: 0.82rem;
            color: #64748b;
        }
        .footer-bottom i {
            color: var(--primary);
            margin: 0 4px;
        }



        /* ============================================================
                   响应式
                   ============================================================ */
        @media (max-width: 1024px) {
           
            .footer .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 30px;
            }
            /* SEO 新布局：两列变一列 */
            .seo-content .grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }
        }

        @media (max-width: 768px) {
            .navbar .nav-links {
                display: none;
                flex-direction: column;
                width: 100%;
                padding: 16px 0 10px;
                gap: 16px;
                align-items: center;
                border-top: 1px solid var(--border);
                margin-top: 12px;
                background: #fff;
            }
            .navbar .nav-links.open {
                display: flex;
            }
            .navbar .nav-links a {
                font-size: 1rem;
                color: var(--dark);
            }
            .navbar .nav-links a::after {
                display: none;
            }
            .nav-toggle {
                display: flex;
            }

            .footer .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 28px;
            }
            .footer .footer-grid .footer-col:first-child {
                grid-column: 1 / -1;
            }
        }

        @media (max-width: 480px) {
        
            .footer .footer-grid {
                grid-template-columns: 1fr;
                text-align: center;
            }
            .footer .footer-grid .footer-col:first-child {
                grid-column: 1;
            }
            .footer-col ul li {
                justify-content: center;
            }
            .social-icons {
                justify-content: center;
            }
            .qr-code {
                margin: 0 auto;
            }
        }