:root {
            --primary: #3b82f6;
            --primary-dark: #2563eb;
            --success: #10b981;
            --bg: #f3f4f6;
            --card: #ffffff;
            --text-main: #1f2937;
            --text-muted: #6b7280;
            --radius: 12px;
        }

        body {
            margin: 0;
            font-family: -apple-system, system-ui, sans-serif;
            background-color: var(--bg);
            color: var(--text-main);
            line-height: 1.6;
            -webkit-font-smoothing: antialiased;
        }

        /* 顶部 Banner */
        .header-banner {
            background: linear-gradient(135deg, #1e3a8a 0%, #3b82f6 100%);
            padding: 45px 20px;
            text-align: center;
            color: white;
            border-bottom-left-radius: 30px;
            border-bottom-right-radius: 30px;
            box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
        }
        .header-banner img { width: 64px; height: 64px; margin-bottom: 12px; filter: drop-shadow(0 4px 6px rgba(0,0,0,0.2)); }
        .header-banner h1 { margin: 0; font-size: 26px; font-weight: 800; letter-spacing: -0.5px; }
        .header-banner p { margin: 8px 0 0; opacity: 0.9; font-size: 15px; }

        .container { max-width: 500px; margin: -25px auto 40px; padding: 0 16px; }

        /* 通用卡片 */
        .card {
            background: var(--card);
            border-radius: var(--radius);
            padding: 20px;
            margin-bottom: 16px;
            box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
            border: 1px solid rgba(0, 0, 0, 0.05);
        }

        /* 导航标签 */
        .nav-tabs {
            display: flex;
            background: white;
            padding: 12px 0;
            border-radius: var(--radius);
            margin-bottom: 16px;
            box-shadow: 0 2px 4px rgba(0,0,0,0.05);
        }
        .nav-tab-item {
            flex: 1;
            text-decoration: none;
            color: var(--text-muted);
            font-size: 12px;
            text-align: center;
            transition: color 0.2s;
        }
        .nav-tab-item i { display: block; font-size: 22px; margin-bottom: 4px; }
        .nav-tab-item.active { color: var(--primary); font-weight: 700; }

        /* 链接项 */
        .link-item {
            display: flex;
            align-items: center;
            text-decoration: none;
            color: var(--text-main);
            padding: 14px 0;
            border-bottom: 1px solid #f3f4f6;
        }
        .link-item:last-child { border-bottom: none; }
        .link-item i.icon-notification { color: #ef4444; margin-right: 12px; font-size: 18px; }
        .link-item span { flex: 1; font-size: 14px; font-weight: 500; }
        .link-item .tg-tag { color: var(--primary); font-weight: 600; }

        /* 表单控件 */
        .form-label { display: block; font-size: 13px; font-weight: 600; color: var(--text-muted); margin-bottom: 6px; }
        .form-control {
            width: 100%;
            height: 48px;
            padding: 0 14px;
            border: 1px solid #d1d5db;
            border-radius: 8px;
            font-size: 15px;
            box-sizing: border-box;
            background-color: #fafafa;
            transition: all 0.2s;
            margin-bottom: 16px;
        }
        .form-control:focus { outline: none; border-color: var(--primary); background-color: #fff; box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1); }
        
        /* 按钮 */
        .btn-charge {
            display: block;
            background: var(--success);
            color: white;
            text-decoration: none;
            text-align: center;
            padding: 14px;
            border-radius: 8px;
            font-weight: 700;
            margin-bottom: 20px;
            transition: opacity 0.2s;
        }
        .btn-group { display: grid; grid-template-columns: 1.5fr 1fr 1fr; gap: 10px; }
        .btn {
            border: none;
            border-radius: 8px;
            padding: 12px 5px;
            font-size: 14px;
            font-weight: 600;
            cursor: pointer;
            transition: 0.2s;
        }
        .btn-primary { background: var(--primary); color: white; }
        .btn-outline { background: #eff6ff; color: var(--primary); border: 1px solid #dbeafe; }

        /* 结果区域 */
        .result-item { position: relative; margin-top: 15px; }
        .copy-btn {
            position: absolute;
            right: 8px;
            top: 32px;
            background: #e5e7eb;
            border: none;
            padding: 5px 12px;
            border-radius: 6px;
            font-size: 12px;
            cursor: pointer;
            color: var(--text-main);
        }
        textarea.form-control { height: 90px; padding-top: 12px; resize: none; }

        /* SEO 内容块 */
        .seo-text { font-size: 13px; color: var(--text-muted); line-height: 1.8; margin-top: 20px; }
        
        .fade-in { animation: fadeIn 0.4s ease-out; }
        @keyframes fadeIn { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }