/* ============================================================
   快连 kuailiannap.com.cn — 「脉冲引擎 / Pulse Engine」
   设计语言:光脉冲 / 雷达波 / 速度波形
   暖白底 + 品红玫红主色 + 靛紫辅助 + 深紫黑页脚
   ============================================================ */

:root {
  --bg: #faf6f3;
  --ink: #241327;
  --muted: #6d5974;
  --faint: #a995ad;
  --volt: #e1287a;          /* 品红玫红 · 主色 */
  --volt-d: #c51f68;
  --volt-ink: #ffffff;
  --volt-12: rgba(225, 40, 122, .10);
  --volt-18: rgba(225, 40, 122, .18);
  --violet: #7c4dff;        /* 靛紫 · 辅助 */
  --violet-12: rgba(124, 77, 255, .12);
  --ice: #7c4dff;
  --amber: #f5a623;
  --amber-12: rgba(245, 166, 35, .14);
  --panel: #ffffff;
  --panel2: #f6edf4;
  --line: #eee1ea;
  --line2: #dfc9de;
  --grad: linear-gradient(135deg, #e1287a 0%, #b23bff 62%, #7c4dff 100%);
  --grad-soft: linear-gradient(135deg, rgba(225,40,122,.14), rgba(124,77,255,.14));
  --mono: ui-monospace, "SFMono-Regular", "JetBrains Mono", Consolas, "Courier New", monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --wrap: 1120px;
  --rad: 16px;
  --shadow: 0 18px 44px -18px rgba(36, 19, 39, .28);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  font-family: var(--sans);
  background: var(--bg);
  color: var(--ink);
  line-height: 1.7;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
ul, ol { list-style: none; }

h1, h2, h3, h4 { line-height: 1.22; font-weight: 800; letter-spacing: -.01em; }
h1 { font-size: clamp(30px, 4.4vw, 52px); }
h2 { font-size: clamp(24px, 3vw, 34px); }
h3 { font-size: 18px; }
h4 { font-size: 16px; }

::selection { background: var(--volt); color: #fff; }

.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 24px; }

.volt { color: var(--volt); }
.mono { font-family: var(--mono); }
.grad {
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* ---------- 顶栏 ---------- */
.topbar { background: #180f22; color: #e9dceb; }
.topbar .wrap { display: flex; align-items: center; gap: 10px; padding-top: 8px; padding-bottom: 8px; flex-wrap: wrap; }
.topbar .tb-dot { width: 7px; height: 7px; border-radius: 50%; background: var(--volt); box-shadow: 0 0 10px var(--volt); flex: none; animation: pulse 2.4s infinite; }
.topbar .tb-txt { color: #cbb6d1; font-size: 13.5px; }
.topbar .tb-link { color: #ffd3e6; font-weight: 600; margin-left: auto; font-size: 13.5px; }
.topbar .tb-link:hover { color: #fff; }

@keyframes pulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(225, 40, 122, .55); }
  50% { box-shadow: 0 0 0 6px rgba(225, 40, 122, 0); }
}

/* ---------- 页头 ---------- */
.masthead {
  position: sticky; top: 0; z-index: 50;
  background: rgba(250, 246, 243, .82);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
}
.masthead .wrap { display: flex; align-items: center; justify-content: space-between; gap: 24px; padding-top: 14px; padding-bottom: 14px; }

.wordmark { display: inline-flex; align-items: center; gap: 11px; color: var(--ink); }
.wm-mark { width: 34px; height: 34px; border-radius: 9px; border: 1px solid var(--line2); flex: none; display: block; box-shadow: 0 4px 12px -4px rgba(225,40,122,.35); }
.mastfoot .wm-mark { width: 28px; height: 28px; border-radius: 8px; border-color: rgba(255,255,255,.16); }
.wm-text { display: flex; flex-direction: column; line-height: 1.05; }
.wm-name { font-size: 19px; font-weight: 800; letter-spacing: .02em; color: var(--ink); }
.wm-sub { font-family: var(--mono); font-size: 9.5px; letter-spacing: .18em; color: var(--faint); text-transform: uppercase; }

.nav-wrap { display: flex; align-items: center; gap: 10px; }
.nav { display: flex; gap: 4px; list-style: none; align-items: center; }
.nav a {
  display: block; padding: 8px 15px; border-radius: 999px;
  font-size: 14.5px; font-weight: 600; color: var(--muted);
  transition: color .2s ease, background .2s ease;
}
.nav a:hover { color: var(--ink); background: var(--panel2); }
.nav a.active { color: var(--volt); background: var(--volt-12); }

.nav-toggle { display: none; background: none; border: 1px solid var(--line2); color: var(--ink); font-size: 20px; border-radius: 10px; width: 40px; height: 40px; cursor: pointer; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  font-weight: 700; font-size: 14.5px; line-height: 1;
  border: 1px solid transparent; border-radius: 12px; cursor: pointer;
  transition: transform .18s ease, box-shadow .18s ease, background .18s ease, border-color .18s ease;
  white-space: nowrap;
}
.btn-primary { background: var(--grad); color: #fff; box-shadow: 0 10px 24px -10px rgba(225, 40, 122, .6); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 16px 32px -10px rgba(178, 59, 255, .62); filter: brightness(1.04); }
.btn-outline { background: transparent; color: var(--volt); border-color: var(--line2); }
.btn-outline:hover { border-color: var(--volt); background: var(--volt-12); transform: translateY(-2px); }
.btn-lg { padding: 15px 30px; font-size: 15px; border-radius: 14px; }
.btn-sm { padding: 9px 18px; font-size: 13px; }
.nav-cta { flex: none; }

/* ---------- 区块 ---------- */
.section { padding: 74px 0; }
.section.alt { background: linear-gradient(180deg, #f7eef6, #f6edf5); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.sec-head { max-width: 720px; margin: 0 auto 42px; text-align: center; }
.sec-head h2 { margin-bottom: 10px; }
.sec-head p { color: var(--muted); font-size: 16px; }
.kicker {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--mono); font-size: 12px; letter-spacing: .16em;
  text-transform: uppercase; color: var(--volt); margin-bottom: 16px;
}
.kicker::before { content: ""; width: 8px; height: 8px; border-radius: 50%; background: var(--volt); box-shadow: 0 0 10px var(--volt); }

/* ---------- 首页 hero(脉冲) ---------- */
.pulse-hero { position: relative; padding: 92px 0 78px; overflow: hidden; }
.ph-bg {
  position: absolute; inset: 0; z-index: 0;
  background:
    radial-gradient(58% 70% at 82% 12%, rgba(225,40,122,.16), transparent 62%),
    radial-gradient(48% 60% at 12% 88%, rgba(124,77,255,.14), transparent 60%),
    url("../images/earth-network.jpg") center / cover;
  filter: blur(2px) saturate(1.05);
  opacity: .5;
  transform: scale(1.02);
}
.ph-bg::after {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(180deg, rgba(250,246,243,.62), rgba(250,246,243,.9) 88%);
}
.pulse-hero .wrap { position: relative; z-index: 1; }
.ph-grid { display: grid; grid-template-columns: 1.05fr .95fr; gap: 48px; align-items: center; }
.ph-left { max-width: 620px; }

.eyebrow { display: inline-flex; align-items: center; gap: 9px; font-family: var(--mono); font-size: 12.5px; letter-spacing: .14em; text-transform: uppercase; color: var(--muted); margin-bottom: 22px; }
.eyebrow .ey-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--volt); box-shadow: 0 0 10px var(--volt); animation: pulse 2.2s infinite; }

.pulse-hero h1 { margin-bottom: 18px; }
.pulse-hero .lead { color: var(--muted); font-size: 17px; max-width: 540px; margin-bottom: 30px; }

.ph-cta { display: flex; gap: 14px; flex-wrap: wrap; margin-bottom: 26px; }
.ph-tags { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 34px; }
.chip {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 13px; color: var(--muted);
  background: var(--panel); border: 1px solid var(--line); border-radius: 999px;
  padding: 7px 15px;
}
.chip b { color: var(--ink); font-weight: 700; }
.chip::before { content: ""; width: 6px; height: 6px; border-radius: 50%; background: var(--volt); }

.ph-stats { display: flex; gap: 14px; flex-wrap: wrap; padding-top: 26px; border-top: 1px solid var(--line2); }
.cs { flex: 1 1 110px; min-width: 96px; }
.cs b { display: block; font-family: var(--mono); font-size: 27px; font-weight: 700; color: var(--ink); line-height: 1.1; }
.cs b small { font-size: 14px; color: var(--volt); margin-left: 3px; font-weight: 700; }
.cs span { display: block; font-family: var(--mono); font-size: 11px; letter-spacing: .12em; color: var(--faint); text-transform: uppercase; margin-top: 6px; }

/* 雷达脉冲图 */
.ph-right { display: flex; justify-content: center; }
.radar { width: 100%; max-width: 430px; height: auto; filter: drop-shadow(0 22px 44px rgba(225,40,122,.18)); }
.radar .ring { fill: none; stroke: var(--line2); stroke-width: 1.2; }
.radar .ring.outer { stroke: #e7d2e8; }
.radar .sweep { fill: url(#pg); opacity: .5; }
.radar .arc { fill: none; stroke: var(--volt); stroke-width: 2; stroke-linecap: round; }
.radar .arc.violet { stroke: var(--violet); }
.radar .node { fill: var(--volt); }
.radar .node.violet { fill: var(--violet); }
.radar .node.amber { fill: var(--amber); }
.radar .core { fill: url(#cg); }
.radar .core-ring { fill: none; stroke: var(--volt); stroke-width: 1.6; opacity: .8; animation: ring 2.8s ease-out infinite; transform-origin: center; transform-box: fill-box; }
.radar .lbl { font-family: var(--mono); font-size: 11px; fill: var(--muted); }
@keyframes ring { 0% { transform: scale(.4); opacity: .9; } 100% { transform: scale(1.7); opacity: 0; } }

/* ---------- 速度波形(招牌区块) ---------- */
.wave-wrap { max-width: 960px; margin: 0 auto; }
.wave { position: relative; }
.wave svg { display: block; width: 100%; height: auto; }
.wave-fill { fill: url(#wff); }
.wave-path { fill: none; stroke: url(#wf); stroke-width: 3; stroke-linecap: round; stroke-linejoin: round; }
.wave-dot { fill: #fff; stroke: var(--volt); stroke-width: 3; }
.wave-dot.violet { stroke: var(--violet); }
.wave-grid { stroke: var(--line); stroke-width: 1; stroke-dasharray: 3 6; }
.wave-lbl { font-family: var(--mono); font-size: 11px; fill: var(--faint); }
.wave-legend { display: flex; gap: 22px; flex-wrap: wrap; justify-content: center; margin-top: 26px; }
.wave-legend span { display: inline-flex; align-items: center; gap: 8px; font-family: var(--mono); font-size: 12.5px; color: var(--muted); }
.wave-legend i { width: 10px; height: 10px; border-radius: 50%; background: var(--volt); flex: none; }
.wave-legend i.violet { background: var(--violet); }

/* ---------- 功能卡(pulse-grid) ---------- */
.pulse-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.pcard {
  position: relative; background: var(--panel); border: 1px solid var(--line); border-radius: var(--rad);
  padding: 26px 24px; transition: transform .2s ease, border-color .2s ease, box-shadow .2s ease;
}
.pcard:hover { border-color: var(--line2); transform: translateY(-4px); box-shadow: var(--shadow); }
.pcard .ic {
  width: 46px; height: 46px; border-radius: 13px; display: grid; place-items: center;
  background: var(--grad-soft); margin-bottom: 16px; font-size: 22px;
}
.pcard .pc-tag { display: inline-block; font-family: var(--mono); font-size: 11px; letter-spacing: .06em; color: var(--volt); margin-bottom: 9px; }
.pcard .pc-tag.violet { color: var(--violet); }
.pcard .pc-tag.amber { color: var(--amber); }
.pcard h3 { margin-bottom: 8px; font-size: 17px; }
.pcard p { color: var(--muted); font-size: 14.5px; line-height: 1.7; }
.pcard::after {
  content: ""; position: absolute; top: 18px; right: 18px; width: 7px; height: 7px;
  border-radius: 50%; background: var(--volt); box-shadow: 0 0 8px var(--volt); opacity: .5;
}

/* ---------- 步骤(log) ---------- */
.log { max-width: 720px; margin: 0 auto; }
.log-head { display: flex; align-items: center; gap: 8px; font-family: var(--mono); font-size: 12px; color: var(--faint); margin-bottom: 16px; }
.log-head .dots { display: flex; gap: 5px; }
.log-head .dots i { width: 9px; height: 9px; border-radius: 50%; background: var(--line2); }
.log-head .dots i:first-child { background: var(--volt); }
.log-line { display: flex; gap: 20px; padding: 20px 4px; border-bottom: 1px solid var(--line); }
.log-line:last-child { border-bottom: none; }
.log-line .ln { font-family: var(--mono); font-size: 14px; color: var(--volt); font-weight: 700; flex: none; padding-top: 3px; }
.log-line h3 { font-size: 16.5px; margin-bottom: 5px; }
.log-line p { color: var(--muted); font-size: 14.5px; }

/* ---------- 下载步骤(steps) ---------- */
.steps { max-width: 720px; margin: 0 auto; }
.step { display: flex; gap: 20px; padding: 18px 4px; border-bottom: 1px solid var(--line); }
.step:last-child { border-bottom: none; }
.step .n { font-family: var(--mono); font-size: 14px; color: var(--volt); font-weight: 700; flex: none; padding-top: 3px; }
.step .b h3 { font-size: 16.5px; margin-bottom: 5px; }
.step .b p { color: var(--muted); font-size: 14.5px; }

/* ---------- 左右图文(split) ---------- */
.split { display: grid; grid-template-columns: 1fr 1fr; gap: 44px; align-items: center; }
.split.rev .img { order: -1; }
.split h2 { margin-bottom: 16px; }
.split .txt p { color: var(--muted); margin-bottom: 14px; }
.split .txt .btn { margin-top: 8px; }
.split .img img { border-radius: var(--rad); aspect-ratio: 4 / 3; object-fit: cover; box-shadow: var(--shadow); }

/* ---------- 表格 ---------- */
.table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: var(--rad); background: var(--panel); }
.table-wrap table { width: 100%; border-collapse: collapse; font-size: 14.5px; min-width: 520px; }
.table-wrap th, .table-wrap td { padding: 14px 18px; text-align: left; border-bottom: 1px solid var(--line); }
.table-wrap thead th { background: var(--panel2); font-family: var(--mono); font-size: 12.5px; letter-spacing: .05em; color: var(--muted); }
.table-wrap tbody tr:last-child td { border-bottom: none; }
.table-wrap td { color: var(--muted); }
.table-wrap td:first-child { color: var(--ink); font-weight: 600; }
.ver-table th:not(:first-child), .ver-table td:not(:first-child) { text-align: center; }
.ver-table tbody td:first-child { color: var(--ink); font-weight: 600; }
.badge-hit { font-family: var(--mono); font-size: 11px; color: var(--volt); background: var(--volt-12); padding: 2px 7px; border-radius: 5px; margin-left: 6px; }

/* ---------- 提示框 ---------- */
.tip, .callout {
  display: flex; gap: 12px; padding: 16px 18px; border-radius: 12px;
  background: var(--panel2); border: 1px solid var(--line); border-left: 3px solid var(--volt);
  margin: 22px 0; color: var(--muted); font-size: 14.5px;
}
.tip .e, .callout .e { flex: none; font-size: 18px; line-height: 1.4; }
.callout { border-left-color: var(--violet); }

/* ---------- FAQ ---------- */
.faq { max-width: 820px; margin: 0 auto; }
.faq-group-label { display: flex; align-items: center; gap: 10px; font-family: var(--mono); font-size: 13px; letter-spacing: .1em; color: var(--volt); text-transform: uppercase; margin: 34px 0 10px; }
.faq-group-label:first-child { margin-top: 0; }
.faq-group-label::before { content: ""; width: 8px; height: 8px; border-radius: 50%; background: var(--volt); }
.faq-item { border: 1px solid var(--line); border-radius: 13px; background: var(--panel); margin-bottom: 12px; overflow: hidden; }
.faq-q {
  width: 100%; display: flex; align-items: center; justify-content: space-between; gap: 14px;
  padding: 17px 20px; background: none; border: none; cursor: pointer; text-align: left;
  font-family: var(--sans); font-size: 15.5px; font-weight: 700; color: var(--ink);
}
.faq-q:hover { color: var(--volt); }
.faq-q .x { font-size: 20px; color: var(--faint); font-weight: 400; transition: transform .2s ease; flex: none; }
.faq-item.open .faq-q .x { transform: rotate(45deg); color: var(--volt); }
.faq-a { max-height: 0; overflow: hidden; transition: max-height .3s ease; }
.faq-a p { padding: 0 20px 20px; color: var(--muted); font-size: 14.5px; }
.faq-a a { color: var(--volt); text-decoration: underline; }

/* ---------- 内页 hero / 面包屑 ---------- */
.page-hero { padding: 66px 0 40px; border-bottom: 1px solid var(--line); background: linear-gradient(180deg, #f7eef6, transparent); }
.page-hero h1 { margin-bottom: 14px; }
.page-hero > .wrap > p { color: var(--muted); font-size: 16.5px; max-width: 680px; }
.breadcrumb { display: flex; align-items: center; gap: 8px; font-family: var(--mono); font-size: 13px; color: var(--faint); margin-bottom: 20px; }
.breadcrumb a { color: var(--faint); }
.breadcrumb a:hover { color: var(--volt); }
.breadcrumb .sep { color: var(--line2); }

/* ---------- 文章 ---------- */
.article-hero { padding: 58px 0 40px; border-bottom: 1px solid var(--line); }
.article-hero h1 { max-width: 860px; margin-bottom: 18px; font-size: clamp(26px, 3.6vw, 38px); }
.article-hero .meta { display: flex; gap: 20px; flex-wrap: wrap; font-family: var(--mono); font-size: 13px; color: var(--faint); }
.article-hero .meta b { color: var(--muted); font-weight: 600; }
.article-body { display: grid; grid-template-columns: 220px 1fr; gap: 48px; padding: 48px 24px; align-items: start; max-width: var(--wrap); margin: 0 auto; }

.toc { position: sticky; top: 90px; border: 1px solid var(--line); border-radius: 13px; background: var(--panel); padding: 20px; }
.toc h5 { font-family: var(--mono); font-size: 12px; letter-spacing: .14em; text-transform: uppercase; color: var(--volt); margin-bottom: 14px; }
.toc ol { list-style: none; }
.toc li { margin-bottom: 9px; }
.toc li a { display: flex; gap: 10px; font-size: 13.5px; color: var(--muted); line-height: 1.45; }
.toc li a:hover { color: var(--volt); }
.toc .num { font-family: var(--mono); color: var(--faint); flex: none; }

.prose { max-width: 720px; }
.prose h2 { font-size: 24px; margin: 40px 0 14px; padding-top: 20px; border-top: 1px solid var(--line); }
.prose h2:first-child { margin-top: 0; padding-top: 0; border-top: none; }
.prose p { color: #4a3a4e; margin-bottom: 18px; font-size: 16px; }
.prose strong { color: var(--ink); }
.prose ul, .prose ol { margin: 0 0 20px 4px; padding-left: 24px; }
.prose ul li, .prose ol li { color: #4a3a4e; margin-bottom: 9px; }
.prose ul { list-style: disc; }
.prose ol { list-style: decimal; }
.prose a { color: var(--volt); text-decoration: underline; }
.prose blockquote {
  margin: 26px 0; padding: 18px 22px; border-left: 3px solid var(--volt);
  background: var(--panel2); border-radius: 0 12px 12px 0; color: var(--muted); font-style: italic;
}
.prose figure { margin: 28px 0; }
.prose figure img { border: 1px solid var(--line); border-radius: var(--rad); width: 100%; }
.prose figcaption { font-family: var(--mono); font-size: 12.5px; color: var(--faint); margin-top: 10px; text-align: center; }

.share { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; margin-top: 40px; padding-top: 24px; border-top: 1px solid var(--line); }
.share-lbl { font-family: var(--mono); font-size: 12px; letter-spacing: .12em; text-transform: uppercase; color: var(--faint); margin-right: 4px; }
.share a { font-family: var(--mono); font-size: 13px; color: var(--muted); border: 1px solid var(--line); border-radius: 999px; padding: 7px 15px; }
.share a:hover { color: var(--volt); border-color: var(--volt); }

/* ---------- 相关卡片 ---------- */
.rel-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.rel-card { display: block; background: var(--panel); border: 1px solid var(--line); border-radius: 13px; padding: 20px; transition: border-color .2s ease, transform .2s ease; }
.rel-card:hover { border-color: var(--line2); transform: translateY(-3px); }
.rel-card .tag { display: inline-block; font-family: var(--mono); font-size: 11px; color: var(--volt); background: var(--volt-12); padding: 3px 8px; border-radius: 5px; margin-bottom: 10px; }
.rel-card h4 { font-size: 15.5px; margin-bottom: 7px; color: var(--ink); }
.rel-card p { font-size: 13.5px; color: var(--muted); line-height: 1.6; }

/* ---------- CTA 横幅 ---------- */
.cta-band {
  position: relative; overflow: hidden;
  background: var(--grad); border-radius: 20px;
  padding: 46px 40px; text-align: center; color: #fff;
  box-shadow: 0 26px 60px -24px rgba(178, 59, 255, .6);
}
.cta-band::before {
  content: ""; position: absolute; inset: 0;
  background: radial-gradient(50% 120% at 20% 0%, rgba(255,255,255,.22), transparent 55%),
              radial-gradient(40% 100% at 90% 100%, rgba(255,255,255,.14), transparent 55%);
}
.cta-band h2 { margin-bottom: 12px; position: relative; }
.cta-band p { color: rgba(255,255,255,.9); margin-bottom: 26px; position: relative; }
.cta-band .btn-primary { background: #fff; color: var(--volt); box-shadow: 0 10px 24px -10px rgba(0,0,0,.3); }
.cta-band .btn-primary:hover { transform: translateY(-2px); filter: none; }

/* ---------- 搜索 ---------- */
.searchbox input {
  width: 100%; padding: 16px 20px; font-size: 15.5px; color: var(--ink);
  background: var(--panel); border: 1px solid var(--line2); border-radius: 14px;
  outline: none; transition: border-color .2s ease, box-shadow .2s ease;
}
.searchbox input:focus { border-color: var(--volt); box-shadow: 0 0 0 4px var(--volt-12); }
.search-results { list-style: none; }
.search-results li { border-bottom: 1px solid var(--line); padding: 14px 2px; }
.search-results a { color: var(--ink); font-size: 15.5px; }
.search-results a:hover { color: var(--volt); }

/* ---------- 网站地图 ---------- */
.sitemap-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.sitemap-col { background: var(--panel); border: 1px solid var(--line); border-radius: 14px; padding: 24px; }
.sitemap-col h3 { font-family: var(--mono); font-size: 13px; letter-spacing: .1em; text-transform: uppercase; color: var(--volt); margin-bottom: 16px; }
.sitemap-col ul { list-style: none; }
.sitemap-col li { margin-bottom: 9px; }
.sitemap-col a { color: var(--muted); font-size: 14.5px; }
.sitemap-col a:hover { color: var(--volt); }

/* ---------- 下载平台卡 ---------- */
.platform-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.platform { display: flex; flex-direction: column; background: var(--panel); border: 1px solid var(--line); border-radius: var(--rad); padding: 26px 24px; transition: border-color .2s ease, transform .2s ease; }
.platform:hover { border-color: var(--volt); transform: translateY(-3px); }
.platform .pf-os { font-size: 30px; line-height: 1; margin-bottom: 14px; }
.platform h3 { font-size: 17px; margin-bottom: 6px; color: var(--ink); }
.platform p { color: var(--muted); font-size: 14px; flex: 1; margin-bottom: 6px; }
.platform .pf-meta { font-family: var(--mono); font-size: 12px; color: var(--faint); margin-bottom: 16px; }
.platform .btn { width: 100%; }

/* ---------- 页脚 ---------- */
.mastfoot { border-top: 1px solid #2c1a34; background: #180f22; color: #d9c9de; padding: 52px 0 34px; }
.mf-top { display: flex; align-items: center; justify-content: space-between; gap: 24px; flex-wrap: wrap; padding-bottom: 24px; border-bottom: 1px solid #2c1a34; }
.mastfoot .wordmark { color: #fff; }
.mastfoot .wm-name { color: #fff; }
.mastfoot .wm-sub { color: #9d86a6; }
.mf-nav { display: flex; gap: 18px; flex-wrap: wrap; }
.mf-nav a { font-family: var(--mono); font-size: 13.5px; color: #b79fc0; }
.mf-nav a:hover { color: #ffd3e6; }
.mf-links { display: flex; gap: 8px 18px; flex-wrap: wrap; align-items: center; padding: 22px 0; font-family: var(--mono); font-size: 12.5px; }
.mf-links a { color: #9d86a6; }
.mf-links a:hover { color: #ffd3e6; }
.mf-links .mf-g { color: var(--volt); letter-spacing: .08em; margin-right: 4px; }
.mf-bot { display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap; border-top: 1px solid #2c1a34; padding-top: 22px; font-family: var(--mono); font-size: 12.5px; color: #9d86a6; }

/* ---------- 返回顶部 ---------- */
.backtop {
  position: fixed; right: 26px; bottom: 26px; z-index: 60;
  width: 46px; height: 46px; border-radius: 14px; border: none; cursor: pointer;
  background: var(--grad); color: #fff; font-size: 20px;
  opacity: 0; pointer-events: none; transform: translateY(10px);
  transition: opacity .25s ease, transform .25s ease; box-shadow: 0 12px 28px -10px rgba(178,59,255,.6);
}
.backtop.show { opacity: 1; pointer-events: auto; transform: translateY(0); }

/* ---------- 响应式 ---------- */
@media (max-width: 960px) {
  .ph-grid { grid-template-columns: 1fr; gap: 36px; }
  .ph-right { order: -1; }
  .radar { max-width: 360px; }
  .pulse-grid, .platform-grid, .rel-grid, .sitemap-grid { grid-template-columns: repeat(2, 1fr); }
  .split { grid-template-columns: 1fr; gap: 28px; }
  .split.rev .img { order: 0; }
  .article-body { grid-template-columns: 1fr; }
  .toc { position: static; }
}

@media (max-width: 680px) {
  .nav { display: none; position: absolute; top: 100%; left: 0; right: 0; flex-direction: column; align-items: stretch; background: var(--bg); border-bottom: 1px solid var(--line); padding: 12px 24px 20px; }
  .nav.open { display: flex; }
  .nav a { padding: 12px 14px; border-radius: 10px; }
  .nav-toggle { display: block; }
  .pulse-grid, .platform-grid, .rel-grid, .sitemap-grid { grid-template-columns: 1fr; }
  .section { padding: 54px 0; }
  .pulse-hero { padding: 64px 0 56px; }
  .cs { flex: 1 1 40%; }
}