/* ================= 基础 ================= */
    * { margin: 0; padding: 0; box-sizing: border-box; }
    html { scroll-behavior: smooth; }
    body {
      font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Segoe UI", sans-serif;
      color: #111;
      background: #fff;
    }
    a { text-decoration: none; color: inherit; }
    button { font-family: inherit; cursor: pointer; border: none; background: none; }

    /* ================= 顶部导航 ================= */
    .site-header {
      position: absolute; top: 0; left: 0; right: 0; z-index: 50;
      display: flex; align-items: center; justify-content: space-between;
      padding: 18px 40px;
    }
    .logo { font-size: 22px; font-weight: 800; letter-spacing: 2px; color: #fff; font-style: italic; }
    .main-nav { display: flex; gap: 34px; }
    .main-nav a { color: rgba(255, 255, 255, .92); font-size: 15px; transition: opacity .2s; }
    .main-nav a:hover { opacity: .7; }
    .header-actions { display: flex; gap: 12px; align-items: center; }
    .btn-try { background: #fff; color: #111; font-size: 14px; padding: 8px 18px; border-radius: 999px; border: 1px solid rgba(0, 0, 0, .08); }

    /* 联系客服弹层（点击出现，可复制微信号） */
    .cs-wrap { position: relative; }
    .cs-pop {
      position: absolute; top: calc(100% + 12px); right: 0; z-index: 60;
      width: 250px; padding: 18px 20px; display: none;
      background: #fff; border-radius: 14px; text-align: left;
      box-shadow: 0 12px 36px rgba(2, 10, 40, .28);
    }
    .cs-pop.show { display: block; }
    .cs-pop::before {
      content: ""; position: absolute; top: -6px; right: 34px;
      width: 12px; height: 12px; background: #fff; transform: rotate(45deg);
    }
    .cs-pop .label { font-size: 13px; color: #6b7280; }
    .cs-pop .wx-row { display: flex; align-items: center; gap: 10px; margin-top: 8px; }
    .cs-pop .wx-id {
      flex: 1; font-size: 16px; font-weight: 600; color: #111;
      font-family: "SF Mono", ui-monospace, Menlo, Consolas, monospace;
      user-select: all;
    }
    .cs-pop .btn-copy {
      flex: none; font-size: 13px; color: #fff; background: #1d4ed8;
      padding: 6px 14px; border-radius: 999px; transition: background .2s;
    }
    .cs-pop .btn-copy:hover { background: #1e40af; }
    .cs-pop .btn-copy.copied { background: #16a34a; }

    /* ================= Hero 星空区 ================= */
    .hero {
      position: relative;
      overflow: hidden;
      background: linear-gradient(180deg,
        #02040e 0%, #04102e 14%, #082763 30%, #0f47a8 44%,
        #2b74dd 57%, #63a9ee 70%, #a8d4f6 82%, #e3f2fd 92%, #ffffff 100%);
      padding: 190px 20px 0;
    }
    .hero-stars {
      position: absolute; inset: 0;
      background: url('../images/starfield.png') center top / cover no-repeat;
      pointer-events: none;
    }
    .hero-inner { position: relative; text-align: center; }
    .wb-icon {
      width: 96px; height: 96px; margin: 0 auto 30px; display: block;
      filter: drop-shadow(0 10px 24px rgba(0, 20, 60, .35));
    }
    .hero h1 {
      font-family: "SF Mono", ui-monospace, Menlo, Consolas, "Courier New", monospace;
      font-size: 44px; font-weight: 700; color: #fff; letter-spacing: 1px;
    }
    .hero .subtitle {
      margin: 22px auto 0; max-width: 680px;
      color: rgba(255, 255, 255, .85); font-size: 17px; line-height: 1.8;
    }

    /* ================= 模式切换标签 ================= */
    .mode-tabs {
      margin: 44px auto 0; display: inline-flex;
      background: rgba(255, 255, 255, .35); backdrop-filter: blur(8px);
      border-radius: 999px; padding: 5px; gap: 4px;
    }
    .mode-tabs button { font-size: 15px; color: #1f2937; padding: 9px 22px; border-radius: 999px; transition: all .2s; }
    .mode-tabs button.active { background: #fff; box-shadow: 0 2px 10px rgba(0, 30, 80, .18); font-weight: 600; }

    /* ================= 安装步骤卡片（仅标题+介绍） ================= */
    .steps {
      position: relative; max-width: 740px; margin: 56px auto 0;
      display: flex; flex-direction: column; gap: 16px;
    }
    .step-card {
      background: #fff; border: 1px solid #ececec; border-radius: 16px;
      padding: 24px 26px; text-align: left;
      box-shadow: 0 1px 2px rgba(16, 24, 40, .03);
      display: flex; align-items: center; gap: 16px;
    }
    .step-num {
      flex: none; width: 32px; height: 32px; border-radius: 50%;
      background: #f3f4f6; color: #374151; font-size: 15px; font-weight: 600;
      display: flex; align-items: center; justify-content: center;
    }
    .step-title { font-size: 17px; font-weight: 600; color: #111; }
    .step-sub { font-size: 14px; color: #9ca3af; margin-top: 4px; line-height: 1.6; }

    /* ================= 支持多种 Local Agent（logo + 文字，18 个分三行） ================= */
    .agent-support { max-width: 1100px; margin: 40px auto 0; padding-bottom: 80px; text-align: center; }
    .agent-support .cap { font-size: 15px; color: #1f2937; font-weight: 600; margin-bottom: 28px; }
    .agent-grid { display: grid; grid-template-columns: repeat(6, 1fr); gap: 18px 12px; }
    .agent-cell {
      display: flex; flex-direction: column; align-items: center; gap: 10px;
      padding: 18px 8px 16px;
      background: #fff; border: 1px solid #ececec; border-radius: 14px;
      transition: box-shadow .2s, transform .2s;
    }
    .agent-cell:hover { box-shadow: 0 8px 24px rgba(16, 24, 40, .08); transform: translateY(-2px); }
    .agent-icon { width: 38px; height: 38px; object-fit: contain; display: block; }
    .agent-name { font-size: 13.5px; color: #374151; white-space: nowrap; }

    /* ================= 新闻中心 ================= */
    .features { padding: 40px 20px 110px; text-align: center; }
    .features h2 { font-size: 30px; font-weight: 700; }
    .features .sec-sub { margin-top: 12px; font-size: 15px; color: #9ca3af; }
    .news-grid {
      max-width: 1080px; margin: 40px auto 0;
      display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px;
    }
    .news-card {
      background: #fff; border: 1px solid #ececec; border-radius: 16px;
      overflow: hidden; text-align: left; display: flex; flex-direction: column;
      transition: box-shadow .2s, transform .2s;
    }
    .news-card:hover { box-shadow: 0 12px 32px rgba(16, 24, 40, .1); transform: translateY(-3px); }
    .news-thumb { width: 100%; aspect-ratio: 16 / 9; object-fit: cover; display: block; }
    .news-body { padding: 18px 20px 20px; display: flex; flex-direction: column; flex: 1; }
    .news-title { font-size: 16.5px; font-weight: 600; color: #111; line-height: 1.5; }
    .news-excerpt {
      margin-top: 8px; font-size: 13.5px; color: #6b7280; line-height: 1.7;
      display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
    }
    .news-meta {
      margin-top: 14px; display: flex; justify-content: space-between; align-items: center;
      font-size: 12.5px; color: #9ca3af;
    }
    .news-meta .more { color: #2563eb; font-size: 13px; }
    .news-more-btn {
      display: inline-block; margin-top: 34px; font-size: 15px; color: #1f2937;
      padding: 11px 34px; border: 1px solid #e5e7eb; border-radius: 999px;
      background: #fff; transition: all .2s;
    }
    .news-more-btn:hover { background: #f9fafb; box-shadow: 0 4px 14px rgba(16, 24, 40, .08); }

    /* ================= FAQ ================= */
    .faq { max-width: 1080px; margin: 0 auto; padding: 30px 20px 130px; display: flex; gap: 80px; align-items: flex-start; }
    .faq h2 { flex: none; font-size: 30px; font-weight: 700; padding-top: 6px; }
    .faq-list { flex: 1; }
    .faq-item { border-bottom: 1px solid #e5e7eb; }
    .faq-q {
      width: 100%; display: flex; align-items: center; justify-content: space-between;
      padding: 22px 4px; font-size: 16px; color: #111; text-align: left;
    }
    .faq-q svg { flex: none; width: 18px; height: 18px; color: #6b7280; transition: transform .25s; }
    .faq-item.open .faq-q svg { transform: rotate(90deg); }
    .faq-a { max-height: 0; overflow: hidden; transition: max-height .3s ease; }
    .faq-item.open .faq-a { max-height: 420px; }
    .faq-a .inner { padding: 0 4px 24px; color: #4b5563; font-size: 15px; line-height: 1.9; }
    .faq-a a { color: #2563eb; }
    .faq-a a:hover { text-decoration: underline; }
    .faq-qr { margin-top: 14px; width: 120px; border-radius: 8px; border: 1px solid #e5e7eb; }

    /* ================= 底部版权栏（仅保留最下面一块） ================= */
    .footer { background: #0d0d0d; padding: 26px 20px; text-align: center; }
    .footer .copy {
      color: #8a8a8a; font-size: 13px;
      display: flex; flex-wrap: wrap; justify-content: center; align-items: center; gap: 12px;
    }
    .footer .copy a { color: #8a8a8a; }
    .footer .copy a:hover { color: #d4d4d4; }
    .footer .sep { color: #3f3f46; }

    /* ================= 响应式 ================= */
    @media (max-width: 900px) {
      .agent-grid { grid-template-columns: repeat(4, 1fr); }
    }
    @media (max-width: 900px) {
      .news-grid { grid-template-columns: repeat(2, 1fr); }
    }
    @media (max-width: 640px) {
      .agent-grid { grid-template-columns: repeat(3, 1fr); gap: 12px 8px; }
      .agent-cell { padding: 14px 6px 12px; }
      .agent-icon { width: 30px; height: 30px; }
      .agent-name { font-size: 12px; }
      .news-grid { grid-template-columns: 1fr; }
    }
    @media (max-width: 400px) {
      .agent-grid { grid-template-columns: repeat(2, 1fr); }
    }
    @media (max-width: 820px) {
      .main-nav { display: none; }
      .hero h1 { font-size: 32px; }
      .faq { flex-direction: column; gap: 24px; }
      .site-header { padding: 16px 20px; }
    }