/* reset & 全局样式 响应式基础 */
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body {
            font-family: 'Segoe UI', 'PingFang SC', Roboto, 'Helvetica Neue', system-ui, -apple-system, 'BlinkMacSystemFont', 'Noto Sans', sans-serif;
            background: #f5f2ea;  /* 星巴克暖色基调 */
            color: #2c2a29;
            line-height: 1.5;
            scroll-behavior: smooth;
        }

        /* 主容器 */
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 1.5rem;
        }

        /* 头部区域：品牌logo + 导航（简洁SEO内链） */
        .header {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 2rem;
            padding-bottom: 1rem;
            border-bottom: 1px solid #e0d6cc;
        }

        .logo-area h1 {
            font-size: 1.8rem;
            font-weight: 600;
            letter-spacing: 1px;
            background: linear-gradient(135deg, #00704a, #2c5e3f);
            background-clip: text;
            -webkit-background-clip: text;
            color: transparent;
        }

        .logo-area p {
            font-size: 0.85rem;
            color: #5e5b56;
            margin-top: 0.25rem;
        }

        .nav-links a {
            text-decoration: none;
            color: #2c5e3f;
            margin-left: 1.5rem;
            font-weight: 500;
            transition: color 0.2s;
        }

        .nav-links a:hover {
            color: #00704a;
            text-decoration: underline;
        }

        /* 主查询卡片区 */
        .query-card {
            background: #ffffff;
            border-radius: 28px;
            box-shadow: 0 20px 35px -12px rgba(0,0,0,0.1);
            padding: 2rem 2rem 2.5rem;
            margin-bottom: 2.5rem;
            transition: all 0.2s;
            border: 1px solid #efe4d8;
        }

        .query-title {
            font-size: 2rem;
            font-weight: 700;
            margin-bottom: 0.5rem;
            color: #00704a;
            display: flex;
            align-items: center;
            gap: 12px;
            flex-wrap: wrap;
        }

        .query-sub {
            font-size: 1rem;
            color: #6f6a63;
            margin-bottom: 1.8rem;
            border-left: 4px solid #00a862;
            padding-left: 1rem;
        }

        .form-group {
            margin-bottom: 1.5rem;
        }

        label {
            display: block;
            font-weight: 600;
            margin-bottom: 0.5rem;
            color: #2c2a29;
        }

        .input-wrapper {
            position: relative;
        }

        input {
            width: 100%;
            padding: 0.9rem 1rem;
            font-size: 1rem;
            border: 1.5px solid #e0d4c8;
            border-radius: 20px;
            background: #fefcf9;
            transition: 0.2s;
            font-family: inherit;
        }

        input:focus {
            outline: none;
            border-color: #00704a;
            box-shadow: 0 0 0 3px rgba(0,112,74,0.2);
        }

        .hint {
            font-size: 0.75rem;
            color: #8e8a84;
            margin-top: 0.4rem;
        }

        .btn-query {
            background: #00704a;
            color: white;
            border: none;
            padding: 0.9rem 2rem;
            font-size: 1.1rem;
            font-weight: 600;
            border-radius: 40px;
            cursor: pointer;
            transition: all 0.2s;
            width: 100%;
            max-width: 260px;
            display: inline-block;
            text-align: center;
            box-shadow: 0 4px 6px rgba(0,0,0,0.05);
        }

        .btn-query:hover {
            background: #1e5a3e;
            transform: translateY(-2px);
            box-shadow: 0 8px 20px rgba(0,112,74,0.3);
        }

        /* 余额结果展示区域 */
        .result-area {
            margin-top: 2rem;
            background: #f8f6f2;
            border-radius: 24px;
            padding: 1.2rem 1.5rem;
            border-left: 6px solid #00a862;
            transition: 0.2s;
        }

        .result-card {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
        }

        .balance-info h3 {
            font-size: 1.2rem;
            font-weight: 500;
            color: #3b3a37;
        }

        .balance-amount {
            font-size: 2.4rem;
            font-weight: 800;
            color: #00704a;
            letter-spacing: 1px;
        }

        .card-mask {
            font-family: monospace;
            background: #ece4da;
            padding: 0.3rem 1rem;
            border-radius: 40px;
            font-size: 0.85rem;
        }

        .error-message {
            color: #c7362b;
            background: #fff0ee;
            padding: 1rem;
            border-radius: 20px;
        }

        /* 说明与安全区域：SEO 相关性内容 */
        .info-section {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 1.8rem;
            margin: 2.5rem 0;
        }

        .info-box {
            background: #fffdf9;
            padding: 1.5rem;
            border-radius: 24px;
            box-shadow: 0 5px 12px rgba(0,0,0,0.03);
            border: 1px solid #ece1d4;
        }

        .info-box h3 {
            font-size: 1.35rem;
            margin-bottom: 0.8rem;
            color: #2c5e3f;
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .info-box p, .info-box ul {
            color: #4b4742;
            font-size: 0.95rem;
        }

        .info-box ul {
            padding-left: 1.2rem;
            margin-top: 0.5rem;
        }

        .info-box li {
            margin: 0.4rem 0;
        }

        /* 常见问题SEO板块 (FAQ 结构化提高百度排名) */
        .faq-section {
            background: #ffffffea;
            border-radius: 28px;
            padding: 1.8rem;
            margin-top: 1rem;
            border: 1px solid #e6dbcf;
        }

        .faq-section h2 {
            font-size: 1.8rem;
            margin-bottom: 1.5rem;
            color: #2c2a29;
            border-left: 5px solid #00704a;
            padding-left: 1rem;
        }

        .faq-item {
            margin-bottom: 1.4rem;
            border-bottom: 1px dashed #e0cfc0;
            padding-bottom: 1rem;
        }

        .faq-question {
            font-weight: 700;
            font-size: 1.1rem;
            color: #1e5631;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .faq-answer {
            margin-top: 0.6rem;
            color: #56524b;
            line-height: 1.5;
            display: block;
        }

        /* 页脚 footer */
        .footer {
            margin-top: 3rem;
            text-align: center;
            padding: 1.8rem 0;
            border-top: 1px solid #e0d4c8;
            font-size: 0.85rem;
            color: #6f6a63;
        }

        .footer a {
            color: #00704a;
            text-decoration: none;
        }

        /* 响应式辅助 */
        @media (max-width: 680px) {
            .container {
                padding: 1rem;
            }
            .header {
                flex-direction: column;
                align-items: flex-start;
                gap: 0.8rem;
            }
            .nav-links a {
                margin-left: 0;
                margin-right: 1.2rem;
            }
            .query-card {
                padding: 1.5rem;
            }
            .query-title {
                font-size: 1.6rem;
            }
            .balance-amount {
                font-size: 1.8rem;
            }
            .btn-query {
                max-width: 100%;
            }
        }

        /* 星巴克风格点缀 */
        .badge-safe {
            background: #eef4f0;
            border-radius: 40px;
            padding: 0.2rem 0.8rem;
            font-size: 0.7rem;
            font-weight: 500;
            color: #00704a;
        }