:root {
    --primary-blue: #2b65ec;
    --bg-gray: #f5f7fa;
    --card-shadow: 0 4px 15px rgba(0,0,0,0.03);
    --text-main: #222;
    --text-sub: #666;
}

* { box-sizing: border-box; margin: 0; padding: 0; font-family: "PingFang SC", "Microsoft YaHei", sans-serif; -webkit-tap-highlight-color: transparent; }
body { background-color: var(--bg-gray); color: var(--text-main); line-height: 1.5; min-height: 100vh; }

.container { max-width: 900px; margin: 0 auto; padding: 20px; }

/* 头部 Header */
header { display: flex; justify-content: center; padding: 30px 0 20px; text-align: center; }
.logo-area img { width: 70px; height: 70px; border-radius: 18px; box-shadow: 0 5px 15px rgba(43,101,236,0.15); margin-bottom: 10px; }
.hero h1 { font-size: 26px; font-weight: 800; margin-bottom: 8px; color: #1a1a1a; }
.hero p { color: var(--text-sub); font-size: 14px; max-width: 600px; margin: 0 auto 20px; }

/* 业务亮点 */
.points-grid { display: flex; justify-content: center; gap: 10px; flex-wrap: wrap; margin-bottom: 40px; }
.point-card { background: white; padding: 6px 15px; border-radius: 50px; font-size: 12px; font-weight: 600; color: #444; border: 1px solid #eee; display: flex; align-items: center; gap: 5px; }

/* 节点列表清单 */
.nodes-title { margin-bottom: 15px; font-size: 13px; font-weight: bold; color: #999; letter-spacing: 1px; }
.node-list { display: flex; flex-direction: column; gap: 15px; }

/* PC端卡片布局 */
.node-card { 
    background: white; border-radius: 12px; padding: 20px 25px; 
    display: flex; align-items: center; gap: 20px; 
    text-decoration: none; color: inherit; box-shadow: var(--card-shadow);
    border: 1px solid transparent; transition: all 0.2s ease;
}
.node-card:hover { transform: translateY(-2px); box-shadow: 0 8px 25px rgba(43,101,236,0.1); border-color: #e6f0ff; }

.node-icon { width: 56px; height: 56px; flex-shrink: 0; border-radius: 12px; overflow: hidden; background: #f8f9fa; border: 1px solid #eee; }
.node-icon img { width: 100%; height: 100%; object-fit: cover; }

.node-info { flex: 1; display: flex; flex-direction: column; gap: 6px; min-width: 0; }
.node-header { display: flex; align-items: center; gap: 8px; }
.node-title { font-size: 18px; font-weight: 700; color: #111; }
.badge { font-size: 11px; padding: 2px 6px; border-radius: 4px; color: white; font-weight: bold; transform: translateY(-1px); }
.badge.blue { background: #2b65ec; }
.badge.orange { background: #ff8c00; }
.badge.green { background: #28a745; }
.node-desc { font-size: 14px; color: var(--text-sub); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }

/* ⚡️ 协议标签 (PC端恢复显示) ⚡️ */
.protocol-tags { display: flex; gap: 6px; flex-wrap: wrap; margin-top: 4px; }
.tag { font-size: 12px; background: #f0f7ff; color: #2b65ec; padding: 2px 8px; border-radius: 4px; border: 1px solid #e1eaff; font-weight: 500; }

/* PC端按钮 */
.pc-action-btn { 
    background: var(--primary-blue); color: white; padding: 8px 20px; border-radius: 50px; 
    font-size: 13px; font-weight: 600; display: flex; align-items: center; gap: 5px; transition: 0.2s;
}
.pc-action-btn:hover { background: #1a54d6; }
.pc-action-btn.chat-btn { background: #fff; color: var(--primary-blue); border: 1px solid var(--primary-blue); }

.mobile-action-btn { display: none; background: #2b65ec; color: white; padding: 6px 12px; border-radius: 6px; font-size: 12px; font-weight: bold; min-width: 50px; text-align: center; justify-content: center; }
.mobile-action-btn.chat { background: #eef6ff; color: #2b65ec; }

/* 底部联系区 */
.contact-section { margin-top: 50px; border-top: 1px solid #eee; padding-top: 30px; }
.contact-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 15px; }
.contact-item { background: white; border-radius: 12px; padding: 20px; box-shadow: var(--card-shadow); display: flex; flex-direction: column; align-items: center; justify-content: center; text-align: center; }
.contact-item h4 { font-size: 13px; color: #999; margin-bottom: 10px; }
.contact-val { font-weight: bold; font-size: 16px; color: #333; margin-bottom: 10px; word-break: break-all; }
.contact-qr img { width: 120px; height: 120px; border-radius: 6px; border: 1px solid #eee; padding: 5px; }
.btn-mini { font-size: 12px; color: white; background: var(--primary-blue); padding: 4px 12px; border-radius: 20px; text-decoration: none; opacity: 0.9; }

/* ⚡️ 手机端适配 (Max-width 768px) ⚡️ */
@media (max-width: 768px) {
    .container { padding: 12px; }
    .hero { margin-bottom: 20px; }
    .hero h1 { font-size: 22px; }
    .points-grid { gap: 8px; margin-bottom: 20px; }
    .point-card { padding: 5px 10px; font-size: 11px; }

    .node-card { 
        padding: 15px 12px; 
        display: grid;
        grid-template-columns: auto 1fr auto; 
        gap: 12px;
        align-items: center;
        min-height: 70px;
    }

    .node-icon { width: 48px; height: 48px; border-radius: 10px; }
    .node-title { font-size: 16px; line-height: 1.2; }
    .node-desc { display: none; } /* 手机隐藏描述 */

    /* 手机上标签变小一点 */
    .protocol-tags { margin-top: 2px; }
    .tag { font-size: 10px; padding: 1px 5px; }

    .pc-action-btn { display: none; }
    .mobile-action-btn { display: flex; }

    .contact-grid { grid-template-columns: 1fr; gap: 15px; }
    .contact-item { flex-direction: row; justify-content: space-between; text-align: left; padding: 15px 20px; }
    .contact-item.qr-item { flex-direction: column; text-align: center; }
    .contact-item h4 { margin: 0; }
    .contact-val { margin: 0; font-size: 14px; }
}

/* 弹窗样式 */
.qr-modal { display: none; position: fixed; z-index: 9999; left: 0; top: 0; width: 100%; height: 100%; overflow: auto; background-color: rgba(0,0,0,0.6); backdrop-filter: blur(5px); align-items: center; justify-content: center; }
.qr-modal-content { background-color: #fff; margin: auto; padding: 30px; border-radius: 16px; width: 90%; max-width: 360px; text-align: center; animation: popup 0.3s ease-out; }
@keyframes popup { from {transform: scale(0.9); opacity: 0;} to {transform: scale(1); opacity: 1;} }
.close-btn { position: absolute; right: 15px; top: 10px; font-size: 24px; color: #999; cursor: pointer; }
.qr-img { width: 100%; max-width: 250px; border-radius: 8px; border: 1px solid #f0f0f0; margin-top: 15px; }