/* iot.天线.公司 —— 原创深空信号风样式（iot- 前缀，零复用） */
:root {
  --iot-bg: #0B1320;
  --iot-bg-2: #0E1828;
  --iot-surface: #121D2E;
  --iot-surface-2: #16263B;
  --iot-line: #22364F;
  --iot-cyan: #18E0C8;
  --iot-indigo: #4A6CF7;
  --iot-amber: #FFB020;
  --iot-text: #E6EEF8;
  --iot-text-dim: #9DB2CC;
  --iot-text-mute: #6B82A0;
  --h2-inset: 16px;            /* 面包屑/H2 左缘对齐基线（文章/列表/产品=16px） */
  --nav-h: 64px;
  --radius: 14px;
  --maxw: 1200px;
  --font: "Segoe UI", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --mono: "SFMono-Regular", Consolas, "Roboto Mono", monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: calc(var(--nav-h) + 16px); }
body {
  margin: 0;
  font-family: var(--font);
  color: var(--iot-text);
  background:
    radial-gradient(1200px 600px at 80% -10%, rgba(24,224,200,.10), transparent 60%),
    radial-gradient(900px 500px at -10% 10%, rgba(74,108,247,.10), transparent 55%),
    var(--iot-bg);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--iot-cyan); text-decoration: none; }
a:hover { color: var(--iot-amber); }
img { max-width: 100%; }

/* ===== 顶部固定导航 ===== */
.iot-nav {
  position: fixed; top: 0; left: 0; right: 0; height: var(--nav-h);
  display: flex; align-items: center; gap: 18px;
  padding: 0 24px; z-index: 1000;
  background: rgba(11,19,32,.82);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--iot-line);
}
.iot-nav .iot-logo {
  font-weight: 800; font-size: 19px; letter-spacing: .5px;
  color: var(--iot-text); display: flex; align-items: center; gap: 10px;
}
.iot-nav .iot-logo .iot-dot {
  width: 12px; height: 12px; border-radius: 50%;
  background: radial-gradient(circle at 30% 30%, var(--iot-cyan), var(--iot-indigo));
  box-shadow: 0 0 14px rgba(24,224,200,.7);
}
.iot-nav .iot-nav-links { display: flex; gap: 4px; margin: 0 auto; align-items: center; }
.iot-nav .iot-nav-links > a, .iot-nav .iot-nav-item > span {
  color: var(--iot-text-dim); padding: 10px 14px; border-radius: 10px;
  font-size: 14.5px; cursor: pointer; display: inline-block;
}
.iot-nav .iot-nav-links > a:hover, .iot-nav .iot-nav-item:hover > span { color: var(--iot-text); background: var(--iot-surface-2); }
.iot-nav .iot-nav-item { position: relative; }
.iot-nav .iot-nav-item > span::after { content: "▾"; font-size: 10px; margin-left: 5px; color: var(--iot-text-mute); }
.iot-nav .iot-nav-sub {
  position: absolute; top: 100%; left: 0; min-width: 200px;
  background: var(--iot-surface); border: 1px solid var(--iot-line);
  border-radius: 12px; padding: 8px; display: none; flex-direction: column;
  box-shadow: 0 18px 40px rgba(0,0,0,.4);
}
.iot-nav .iot-nav-item:hover .iot-nav-sub,
.iot-nav .iot-nav-item:focus-within .iot-nav-sub { display: flex; }
.iot-nav .iot-nav-sub a { padding: 9px 12px; border-radius: 8px; color: var(--iot-text-dim); font-size: 14px; }
.iot-nav .iot-nav-sub a:hover { background: var(--iot-surface-2); color: var(--iot-cyan); }
.iot-nav .iot-burger { display: none; margin-left: auto; background: none; border: 0; color: var(--iot-text); font-size: 24px; cursor: pointer; }

/* ===== 容器 ===== */
.iot-container { max-width: var(--maxw); margin: 0 auto; padding: calc(var(--nav-h) + 22px) 24px 0; }

/* ===== 面包屑（与 H2 左缘严格对齐） ===== */
.iot-breadcrumb {
  font-size: 13.5px; color: var(--iot-text-mute);
  padding: 18px 0 14px var(--h2-inset);
}
.iot-breadcrumb a { color: var(--iot-text-dim); }
.iot-breadcrumb a:hover { color: var(--iot-cyan); }
.iot-breadcrumb .iot-sep { margin: 0 8px; color: var(--iot-text-mute); }
.iot-breadcrumb .iot-cur { color: var(--iot-text); }

/* ===== 详情页布局：左目录 + 右内容 ===== */
.iot-article-layout, .iot-product-layout {
  display: grid; grid-template-columns: 240px minmax(0,1fr); gap: 36px;
  align-items: start; padding-bottom: 60px;
}
.iot-article-layout .iot-toc-aside,
.iot-product-layout .iot-toc-aside { order: -1; }
.iot-content-main {
  padding-left: var(--h2-inset);
  min-width: 0;
}
.iot-content-main h1 {
  font-size: 30px; line-height: 1.35; margin: 6px 0 18px;
  color: #fff; letter-spacing: .3px;
}
.iot-content-main h2 {
  font-size: 22px; margin: 38px 0 14px; padding-top: 14px;
  border-top: 1px solid var(--iot-line); color: #fff;
}
.iot-content-main h2 .iot-anchor { color: var(--iot-cyan); font-weight: 400; margin-right: 8px; font-size: 16px; }
.iot-content-main h3 { font-size: 18px; margin: 26px 0 10px; color: var(--iot-cyan); }
.iot-content-main p { margin: 0 0 14px; color: var(--iot-text); }
.iot-content-main ul, .iot-content-main ol { margin: 0 0 16px; padding-left: 22px; color: var(--iot-text-dim); }
.iot-content-main li { margin: 6px 0; }
.iot-content-main blockquote {
  margin: 18px 0; padding: 14px 18px;
  background: linear-gradient(90deg, rgba(24,224,200,.10), rgba(74,108,247,.06));
  border-left: 3px solid var(--iot-cyan); border-radius: 0 10px 10px 0;
  color: var(--iot-text); font-size: 15px;
}
.iot-content-main strong { color: var(--iot-amber); font-weight: 600; }

/* 摘要块 / 关键词行 / 更新时间 */
.iot-summary-block {
  background: var(--iot-surface); border: 1px solid var(--iot-line);
  border-radius: var(--radius); padding: 18px 20px; margin: 0 0 18px;
  color: var(--iot-text); font-size: 15.5px; line-height: 1.8;
}
.iot-keywords { margin: 0 0 14px; font-size: 13.5px; color: var(--iot-text-mute); }
.iot-keywords b { color: var(--iot-cyan); font-weight: 600; margin-right: 6px; }
.iot-keywords .iot-kw { display: inline-block; margin: 0 8px 0 0; padding: 2px 10px; border: 1px solid var(--iot-line); border-radius: 999px; color: var(--iot-text-dim); }
.iot-update-time { font-size: 13px; color: var(--iot-text-mute); margin: 0 0 18px; }
.iot-update-time time { color: var(--iot-text-dim); }

/* 结论块 */
.iot-conclusion { background: rgba(255,176,32,.07); border: 1px solid rgba(255,176,32,.35); border-radius: var(--radius); padding: 16px 20px; margin: 18px 0; }
.iot-conclusion .iot-concl-title { color: var(--iot-amber); font-weight: 700; margin-bottom: 8px; }
.iot-conclusion ol { margin: 0; padding-left: 22px; }
.iot-conclusion li { color: var(--iot-text); margin: 6px 0; }

/* 实践经验 callout */
.iot-case { background: rgba(74,108,247,.08); border: 1px solid rgba(74,108,247,.4); border-radius: var(--radius); padding: 14px 18px; margin: 18px 0; }
.iot-case .iot-case-title { color: var(--iot-indigo); font-weight: 700; margin-bottom: 6px; }

/* 相关阅读 / 相关产品 */
.iot-related { margin-top: 34px; padding-top: 18px; border-top: 1px solid var(--iot-line); }
.iot-related h2 { border: 0; padding: 0; margin: 0 0 14px; font-size: 20px; }
.iot-related ul { list-style: none; padding: 0; display: grid; gap: 10px; }
.iot-related li { background: var(--iot-surface); border: 1px solid var(--iot-line); border-radius: 12px; padding: 12px 16px; }
.iot-related li a { font-weight: 600; }
.iot-related li .iot-rel-desc { display: block; color: var(--iot-text-mute); font-size: 13.5px; margin-top: 4px; }

/* ===== 表格（覆盖全部正文 table + .iot-spec） ===== */
.iot-content-main table, table.iot-spec {
  width: 100%; border-collapse: collapse; margin: 16px 0 20px;
  font-size: 14.5px; border: 1px solid #cbd5e1; background: var(--iot-surface);
}
.iot-content-main table th, table.iot-spec th {
  background: var(--iot-indigo); color: #fff; text-align: left;
  padding: 10px 12px; border: 1px solid #cbd5e1; font-weight: 600;
}
.iot-content-main table td, table.iot-spec td {
  padding: 9px 12px; border: 1px solid #cbd5e1; color: var(--iot-text);
}
.iot-content-main table tr:nth-child(even) td, table.iot-spec tr:nth-child(even) td { background: rgba(255,255,255,.03); }

/* ===== 右侧 TOC ===== */
.iot-toc-aside { position: sticky; top: calc(var(--nav-h) + 16px); max-height: calc(100vh - var(--nav-h) - 32px); overflow-y: auto; }
.iot-toc-panel { border: 1px solid var(--iot-line); border-radius: var(--radius); background: var(--iot-surface); padding: 12px 14px; }
.iot-toc-panel > summary { cursor: pointer; font-weight: 700; color: var(--iot-text); list-style: none; padding: 4px 2px 8px; }
.iot-toc-panel > summary::-webkit-details-marker { display: none; }
.iot-toc-panel > summary::after { content: "▾"; float: right; color: var(--iot-text-mute); transition: transform .2s; }
.iot-toc-panel[open] > summary::after { transform: rotate(180deg); }
.iot-toc-panel ol { list-style: none; margin: 0; padding: 0; counter-reset: toc; }
.iot-toc-panel ol li { margin: 2px 0; }
.iot-toc-panel ol a { display: block; padding: 6px 10px; border-radius: 8px; color: var(--iot-text-dim); font-size: 13.5px; line-height: 1.5; }
.iot-toc-panel ol a:hover { background: var(--iot-surface-2); color: var(--iot-cyan); }

/* ===== 列表/分类页：左分类 + 右内容 ===== */
.iot-list-layout { padding-bottom: 60px; }
.iot-list-layout .iot-layout-grid { display: grid; grid-template-columns: 240px minmax(0,1fr); gap: 32px; align-items: start; }
.iot-cat-side { position: sticky; top: calc(var(--nav-h) + 16px); }
.iot-cat-panel { border: 1px solid var(--iot-line); border-radius: var(--radius); background: var(--iot-surface); padding: 12px 14px; }
.iot-cat-panel > summary { cursor: pointer; font-weight: 700; color: var(--iot-text); list-style: none; padding: 4px 2px 8px; }
.iot-cat-panel > summary::-webkit-details-marker { display: none; }
.iot-cat-panel > summary::after { content: "▾"; float: right; color: var(--iot-text-mute); transition: transform .2s; }
.iot-cat-panel[open] > summary::after { transform: rotate(180deg); }
.iot-category-list { list-style: none; margin: 6px 0 0; padding: 0; }
.iot-category-list li { margin: 2px 0; }
.iot-category-list a { display: block; padding: 8px 12px; border-radius: 8px; color: var(--iot-text-dim); font-size: 14.5px; }
.iot-category-list a:hover, .iot-category-list a.iot-active { background: var(--iot-surface-2); color: var(--iot-cyan); }
.iot-cat-content { padding-left: var(--h2-inset); min-width: 0; }
.iot-cat-content h1 { font-size: 28px; margin: 6px 0 6px; }
.iot-cat-content .iot-cat-desc { color: var(--iot-text-dim); margin: 0 0 22px; }

/* 卡片网格（列表页条目，非分类侧栏） */
.iot-card-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 18px; }
.iot-card { background: var(--iot-surface); border: 1px solid var(--iot-line); border-radius: var(--radius); padding: 18px; transition: transform .15s, border-color .15s; display: flex; flex-direction: column; }
.iot-card:hover { transform: translateY(-3px); border-color: var(--iot-cyan); }
.iot-card h3 { margin: 0 0 8px; font-size: 17px; }
.iot-card h3 a { color: #fff; }
.iot-card .iot-card-cat { font-size: 12.5px; color: var(--iot-cyan); margin-bottom: 8px; }
.iot-card p { color: var(--iot-text-dim); font-size: 14px; margin: 0 0 12px; flex: 1; }
.iot-card .iot-card-meta { font-size: 12.5px; color: var(--iot-text-mute); }

/* ===== 页面（about/contact 等） ===== */
.iot-page-wrap { padding-left: var(--h2-inset); padding-bottom: 60px; max-width: 920px; }
.iot-page-wrap { --h2-inset: 48px; }   /* 页面卡片左缘基线 */
.iot-page-wrap h1 { font-size: 30px; margin: 8px 0 18px; color: #fff; }
.iot-page-wrap h2 { font-size: 22px; margin: 34px 0 12px; padding-top: 14px; border-top: 1px solid var(--iot-line); color: #fff; }
.iot-page-wrap h3 { font-size: 18px; margin: 22px 0 8px; color: var(--iot-cyan); }
.iot-page-wrap p { margin: 0 0 14px; }
.iot-page-wrap ul, .iot-page-wrap ol { color: var(--iot-text-dim); padding-left: 22px; }
.iot-page-wrap li { margin: 6px 0; }
.iot-page-wrap table, table.iot-spec { width: 100%; border-collapse: collapse; margin: 16px 0; border: 1px solid #cbd5e1; }
.iot-page-wrap table th, .iot-page-wrap table td { border: 1px solid #cbd5e1; padding: 9px 12px; }
.iot-page-wrap table th { background: var(--iot-indigo); color: #fff; }

/* 联系/名片 */
.iot-contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; margin-top: 18px; }
.iot-contact-card { background: var(--iot-surface); border: 1px solid var(--iot-line); border-radius: var(--radius); padding: 20px; }
.iot-contact-card h3 { margin-top: 0; color: var(--iot-cyan); }
.iot-mail-btn { display: inline-flex; align-items: center; gap: 8px; background: var(--iot-indigo); color: #fff; padding: 10px 18px; border-radius: 10px; font-weight: 600; cursor: pointer; border: 0; }
.iot-mail-btn:hover { background: var(--iot-cyan); color: #06202b; }

/* ===== FAQ（裸 details，bare_details） ===== */
.iot-faq { margin: 26px 0; }
.iot-faq details { border: 1px solid var(--iot-line); border-radius: 12px; background: var(--iot-surface); margin: 10px 0; padding: 0 16px; }
.iot-faq details summary { cursor: pointer; font-weight: 600; color: var(--iot-text); padding: 14px 0; list-style: none; }
.iot-faq details summary::-webkit-details-marker { display: none; }
.iot-faq details summary::before { content: "＋"; color: var(--iot-cyan); margin-right: 10px; font-weight: 700; }
.iot-faq details[open] summary::before { content: "－"; }
.iot-faq details p { padding: 0 0 14px; color: var(--iot-text-dim); margin: 0; }

/* ===== 首页 ===== */
.iot-home-hero { position: relative; overflow: hidden; padding: 70px 0 50px; text-align: center; }
.iot-home-hero .iot-wave { position: absolute; left: 50%; top: 30%; width: 900px; height: 900px; transform: translateX(-50%); border-radius: 50%; border: 1px solid rgba(24,224,200,.18); animation: iot-pulse 7s ease-out infinite; }
.iot-home-hero .iot-wave:nth-child(2) { animation-delay: 1.4s; border-color: rgba(74,108,247,.16); }
.iot-home-hero .iot-wave:nth-child(3) { animation-delay: 2.8s; border-color: rgba(255,176,32,.12); }
@keyframes iot-pulse { 0% { transform: translateX(-50%) scale(.4); opacity: .8; } 100% { transform: translateX(-50%) scale(1.1); opacity: 0; } }
.iot-home-hero h1 { position: relative; font-size: 42px; margin: 0 0 16px; color: #fff; letter-spacing: .5px; }
.iot-home-hero p { position: relative; font-size: 17px; color: var(--iot-text-dim); max-width: 720px; margin: 0 auto 26px; }
.iot-home-hero .iot-cta { position: relative; display: inline-flex; gap: 12px; }
.iot-btn { display: inline-flex; align-items: center; gap: 8px; padding: 12px 24px; border-radius: 999px; font-weight: 700; cursor: pointer; border: 1px solid transparent; }
.iot-btn-primary { background: linear-gradient(120deg, var(--iot-cyan), var(--iot-indigo)); color: #05131c; }
.iot-btn-ghost { border-color: var(--iot-line); color: var(--iot-text); }
.iot-home-section { padding: 44px 0; }
.iot-home-section h2 { font-size: 26px; color: #fff; margin: 0 0 6px; text-align: center; }
.iot-home-section .iot-sec-sub { text-align: center; color: var(--iot-text-mute); margin: 0 0 28px; }
.iot-prod-cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px,1fr)); gap: 20px; }
.iot-prod-card { background: var(--iot-surface); border: 1px solid var(--iot-line); border-radius: var(--radius); padding: 22px; }
.iot-prod-card .iot-pc-icon { width: 44px; height: 44px; border-radius: 12px; background: linear-gradient(135deg, rgba(24,224,200,.2), rgba(74,108,247,.2)); display: flex; align-items: center; justify-content: center; color: var(--iot-cyan); font-size: 22px; margin-bottom: 14px; }
.iot-prod-card h3 { margin: 0 0 8px; font-size: 18px; color: #fff; }
.iot-prod-card p { color: var(--iot-text-dim); font-size: 14px; margin: 0 0 14px; }
.iot-prod-card a { color: var(--iot-cyan); font-weight: 600; }
.iot-kw-cloud { display: flex; flex-wrap: wrap; gap: 12px; justify-content: center; }
.iot-kw-cloud .iot-kw { padding: 8px 18px; border: 1px solid var(--iot-line); border-radius: 999px; color: var(--iot-text-dim); background: var(--iot-surface); }
.iot-baseline { background: var(--iot-surface); border: 1px solid var(--iot-line); border-radius: var(--radius); padding: 24px; color: var(--iot-text-dim); }
.iot-scenario-caps { display: flex; flex-wrap: wrap; gap: 12px; justify-content: center; }
.iot-scenario-caps .iot-cap { padding: 8px 18px; border-radius: 999px; background: rgba(74,108,247,.12); border: 1px solid rgba(74,108,247,.4); color: var(--iot-text); font-size: 14px; }
.iot-stats { display: grid; grid-template-columns: repeat(4,1fr); gap: 18px; text-align: center; }
.iot-stats .iot-stat .iot-num { font-size: 34px; font-weight: 800; color: var(--iot-cyan); font-family: var(--mono); }
.iot-stats .iot-stat .iot-lbl { color: var(--iot-text-mute); font-size: 14px; }

/* ===== 归档 / 404 ===== */
.iot-archive-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px,1fr)); gap: 18px; padding-bottom: 60px; }
.iot-404 { text-align: center; padding: 100px 0; }
.iot-404 h1 { font-size: 64px; color: var(--iot-cyan); margin: 0; }

/* ===== 页脚 ===== */
.iot-footer { border-top: 1px solid var(--iot-line); background: var(--iot-bg-2); padding: 42px 0 30px; margin-top: 40px; }
.iot-footer .iot-foot-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 28px; }
.iot-footer h4 { color: var(--iot-text); font-size: 15px; margin: 0 0 14px; }
.iot-footer a, .iot-footer p { color: var(--iot-text-mute); font-size: 14px; display: block; margin: 6px 0; }
.iot-footer a:hover { color: var(--iot-cyan); }
.iot-footer .iot-copy { border-top: 1px solid var(--iot-line); margin-top: 28px; padding-top: 18px; color: var(--iot-text-mute); font-size: 13px; text-align: center; }

/* ===== 悬浮工具胶囊 ===== */
.iot-float { position: fixed; right: 18px; top: 50%; transform: translateY(-50%); z-index: 1200; display: flex; flex-direction: column; gap: 12px; }
.iot-float button, .iot-float a.iot-float-btn {
  width: 52px; height: 52px; border-radius: 999px; border: 0; cursor: pointer;
  display: flex; align-items: center; justify-content: center; gap: 6px;
  background: linear-gradient(135deg, var(--iot-indigo), var(--iot-cyan));
  color: #05131c; font-weight: 700; font-size: 13px; box-shadow: 0 8px 22px rgba(24,224,200,.35);
  transition: transform .15s; position: relative;
}
.iot-float button:hover, .iot-float a.iot-float-btn:hover { transform: scale(1.08); color: #05131c; }
.iot-float .iot-float-btn .iot-flabel { display: none; }
.iot-float-card {
  position: fixed; right: 80px; top: 50%; transform: translateY(-50%);
  background: var(--iot-surface); border: 1px solid var(--iot-line); border-radius: 14px;
  padding: 10px; z-index: 1300; display: none; box-shadow: 0 20px 50px rgba(0,0,0,.5);
}
.iot-float-card img { width: auto; max-height: 70vh; border-radius: 8px; display: block; }
.iot-float-card.iot-show { display: block; }

/* ===== 响应式（≤1024 折叠，禁止 display:none 隐藏导航） ===== */
@media (max-width: 1024px) {
  .iot-nav .iot-nav-links { display: none; position: absolute; top: var(--nav-h); left: 0; right: 0; flex-direction: column; background: var(--iot-surface); border-bottom: 1px solid var(--iot-line); padding: 10px; }
  .iot-nav .iot-nav-links.iot-open { display: flex; }
  .iot-nav .iot-burger { display: block; }
  .iot-nav .iot-nav-item { width: 100%; }
  .iot-nav .iot-nav-sub { position: static; display: none; box-shadow: none; border: 0; padding-left: 12px; }
  .iot-nav .iot-nav-item.iot-open .iot-nav-sub { display: flex; }
  .iot-article-layout, .iot-product-layout { grid-template-columns: 1fr; gap: 20px; }
  .iot-toc-aside { position: static; max-height: none; order: 0; }
  .iot-list-layout .iot-layout-grid { grid-template-columns: 1fr; gap: 20px; }
  .iot-cat-side { position: static; }
  .iot-content-main, .iot-cat-content, .iot-page-wrap { padding-left: 14px; }
  .iot-stats { grid-template-columns: repeat(2,1fr); }
  .iot-contact-grid { grid-template-columns: 1fr; }
}
@media (max-width: 600px) {
  .iot-container { padding: 0 16px; }
  .iot-home-hero h1 { font-size: 30px; }
  .iot-content-main h1 { font-size: 24px; }
}