/* ==========================================================================
   快连官网 · 全站样式表
   主题：深邃靛蓝 × 极光青 × 暖橙行动色
   字体：思源宋体（标题） + 思源黑体（正文） + JetBrains Mono（代码/版本）
   ========================================================================== */

:root {
  --color-ink: #0B1F4A;
  --color-ink-2: #142B66;
  --color-ink-3: #1E3A8A;
  --color-bg: #F7F8FC;
  --color-surface: #FFFFFF;
  --color-line: #E4E8F2;
  --color-text: #1B2240;
  --color-muted: #5A6378;
  --color-soft: #8892A6;
  --color-accent: #22D3EE;
  --color-accent-2: #0EA5E9;
  --color-action: #F97316;
  --color-action-2: #EA580C;
  --color-success: #10B981;
  --color-warning: #F59E0B;

  --shadow-sm: 0 1px 2px rgba(11, 31, 74, .06), 0 1px 3px rgba(11, 31, 74, .08);
  --shadow-md: 0 4px 12px rgba(11, 31, 74, .08), 0 2px 4px rgba(11, 31, 74, .05);
  --shadow-lg: 0 20px 40px -16px rgba(11, 31, 74, .25), 0 8px 16px rgba(11, 31, 74, .08);

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-xl: 28px;

  --font-serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", serif;
  --font-sans: "Noto Sans SC", -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", "SF Mono", Consolas, monospace;

  --container: 1200px;
}

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

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

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

img, svg { max-width: 100%; display: block; }

a { color: inherit; text-decoration: none; transition: color .2s ease; }
a:hover { color: var(--color-accent-2); }

h1, h2, h3, h4 {
  font-family: var(--font-serif);
  color: var(--color-ink);
  line-height: 1.3;
  font-weight: 700;
  letter-spacing: -0.01em;
}

h1 { font-size: clamp(2rem, 4vw, 3rem); }
h2 { font-size: clamp(1.6rem, 2.6vw, 2.2rem); }
h3 { font-size: 1.25rem; }
h4 { font-size: 1.05rem; }

p { color: var(--color-muted); }

ul { list-style: none; }

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

/* ===== 顶部导航 ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid var(--color-line);
}

.site-header .header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-serif);
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--color-ink);
}

.brand-mark {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--color-ink) 0%, var(--color-ink-3) 100%);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--color-accent);
  font-weight: 800;
  letter-spacing: -0.02em;
  box-shadow: var(--shadow-sm);
}

.nav-list {
  display: flex;
  gap: 6px;
  align-items: center;
}

.nav-list a {
  display: inline-block;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  color: var(--color-text);
  font-weight: 500;
}

.nav-list a:hover { background: rgba(34, 211, 238, .08); color: var(--color-ink); }
.nav-list a.active { background: var(--color-ink); color: #fff; }

.burger {
  display: none;
  width: 40px;
  height: 40px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-sm);
  background: #fff;
  cursor: pointer;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 4px;
}
.burger span {
  width: 18px;
  height: 2px;
  background: var(--color-ink);
  transition: .25s;
}

/* ===== 按钮 ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 22px;
  border-radius: var(--radius-md);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  border: 1px solid transparent;
  transition: transform .15s ease, box-shadow .2s ease, background .2s ease;
  white-space: nowrap;
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-action) 0%, var(--color-action-2) 100%);
  color: #fff;
  box-shadow: 0 6px 16px -4px rgba(249, 115, 22, .55);
}
.btn-primary:hover { transform: translateY(-1px); color: #fff; box-shadow: 0 10px 22px -6px rgba(249, 115, 22, .65); }

.btn-accent {
  background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-2) 100%);
  color: var(--color-ink);
  box-shadow: 0 6px 16px -4px rgba(34, 211, 238, .55);
}
.btn-accent:hover { transform: translateY(-1px); color: var(--color-ink); }

.btn-ghost {
  background: transparent;
  border-color: var(--color-line);
  color: var(--color-ink);
}
.btn-ghost:hover { border-color: var(--color-ink); background: rgba(11, 31, 74, .04); }

.btn-ink {
  background: var(--color-ink);
  color: #fff;
}
.btn-ink:hover { background: var(--color-ink-2); color: #fff; }

.btn-lg { padding: 14px 28px; font-size: 1rem; }

/* ===== 通用区块 ===== */
section { padding: 88px 0; }
section.compact { padding: 56px 0; }

.eyebrow {
  display: inline-block;
  padding: 6px 14px;
  background: rgba(34, 211, 238, .12);
  color: var(--color-ink-3);
  font-size: 0.8rem;
  font-weight: 600;
  border-radius: 999px;
  letter-spacing: 0.04em;
}

.section-head { text-align: center; max-width: 720px; margin: 0 auto 56px; }
.section-head .eyebrow { margin-bottom: 14px; }
.section-head p { margin-top: 14px; font-size: 1.05rem; }

.grid { display: grid; gap: 24px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

/* ===== 英雄区 ===== */
.hero {
  position: relative;
  padding: 120px 0 96px;
  background: radial-gradient(1200px 600px at 80% -10%, rgba(34, 211, 238, .18) 0%, transparent 60%),
              radial-gradient(900px 500px at 0% 30%, rgba(249, 115, 22, .12) 0%, transparent 55%),
              linear-gradient(180deg, #0B1F4A 0%, #142B66 100%);
  color: #fff;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, .04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, .04) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(800px 500px at 50% 30%, #000 30%, transparent 70%);
  -webkit-mask-image: radial-gradient(800px 500px at 50% 30%, #000 30%, transparent 70%);
  pointer-events: none;
}

.hero-inner { display: grid; grid-template-columns: 1.15fr .85fr; gap: 56px; align-items: center; position: relative; }

.hero h1 {
  color: #fff;
  font-size: clamp(2.2rem, 4.4vw, 3.4rem);
  line-height: 1.18;
  letter-spacing: -0.02em;
}
.hero h1 .accent { color: var(--color-accent); }

.hero .lede {
  margin-top: 20px;
  font-size: 1.1rem;
  color: rgba(255, 255, 255, .82);
  line-height: 1.75;
  max-width: 560px;
}

.hero .cta-row { margin-top: 32px; display: flex; gap: 14px; flex-wrap: wrap; }

.hero-meta {
  margin-top: 40px;
  display: flex;
  gap: 32px;
  flex-wrap: wrap;
  color: rgba(255, 255, 255, .7);
  font-size: 0.9rem;
}
.hero-meta b { color: #fff; font-size: 1.4rem; display: block; font-family: var(--font-serif); }
.hero-meta span { display: block; }

/* 节点示意卡 */
.node-card {
  background: rgba(255, 255, 255, .06);
  border: 1px solid rgba(255, 255, 255, .14);
  border-radius: var(--radius-xl);
  padding: 28px;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  position: relative;
}
.node-card h4 {
  color: #fff;
  font-family: var(--font-sans);
  font-size: 0.95rem;
  display: flex;
  align-items: center;
  gap: 8px;
}
.node-card .live-dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: #22D3EE;
  box-shadow: 0 0 0 0 rgba(34, 211, 238, .7);
  animation: pulse 1.8s infinite;
}
@keyframes pulse {
  0% { box-shadow: 0 0 0 0 rgba(34, 211, 238, .6); }
  70% { box-shadow: 0 0 0 12px rgba(34, 211, 238, 0); }
  100% { box-shadow: 0 0 0 0 rgba(34, 211, 238, 0); }
}

.node-list { margin-top: 18px; display: flex; flex-direction: column; gap: 10px; }
.node-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 14px;
  background: rgba(255, 255, 255, .04);
  border: 1px solid rgba(255, 255, 255, .08);
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  color: rgba(255, 255, 255, .85);
}
.node-row .latency { font-family: var(--font-mono); color: var(--color-accent); font-size: 0.85rem; }
.node-row .bar { flex: 1; margin: 0 14px; height: 4px; background: rgba(255, 255, 255, .12); border-radius: 99px; overflow: hidden; }
.node-row .bar i { display: block; height: 100%; background: linear-gradient(90deg, var(--color-accent), var(--color-success)); border-radius: 99px; }

/* ===== 协议原理 ===== */
.protocol {
  background: #fff;
}
.protocol .grid { align-items: stretch; }
.proto-card {
  padding: 28px;
  border-radius: var(--radius-lg);
  background: #fff;
  border: 1px solid var(--color-line);
  transition: transform .25s ease, box-shadow .25s ease, border-color .25s ease;
}
.proto-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(34, 211, 238, .5);
}
.proto-icon {
  width: 52px; height: 52px;
  border-radius: 14px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, rgba(34, 211, 238, .15) 0%, rgba(14, 165, 233, .15) 100%);
  color: var(--color-ink-3);
  margin-bottom: 18px;
}
.proto-card h3 { margin-bottom: 10px; }
.proto-card p { font-size: 0.95rem; }
.proto-card .num {
  font-family: var(--font-mono);
  color: var(--color-soft);
  font-size: 0.85rem;
  margin-top: 14px;
  display: inline-block;
}

/* ===== 数据指标 ===== */
.stats {
  background: linear-gradient(135deg, #0B1F4A 0%, #142B66 100%);
  color: #fff;
}
.stats .grid-4 { gap: 18px; }
.stat-card {
  padding: 32px 24px;
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, .05);
  border: 1px solid rgba(255, 255, 255, .12);
  text-align: center;
}
.stat-card .num {
  font-family: var(--font-serif);
  font-size: 2.6rem;
  font-weight: 800;
  color: var(--color-accent);
  letter-spacing: -0.02em;
}
.stat-card .label { color: rgba(255, 255, 255, .85); margin-top: 8px; font-size: 0.95rem; }
.stat-card .hint { color: rgba(255, 255, 255, .55); font-size: 0.82rem; margin-top: 4px; }

/* ===== 产品矩阵 ===== */
.matrix .grid { gap: 28px; }
.matrix-card {
  display: flex;
  flex-direction: column;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: #fff;
  border: 1px solid var(--color-line);
  transition: transform .25s, box-shadow .25s;
}
.matrix-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.matrix-thumb {
  height: 160px;
  background: linear-gradient(135deg, var(--color-ink) 0%, var(--color-ink-3) 100%);
  position: relative;
  overflow: hidden;
}
.matrix-thumb::after {
  content: "";
  position: absolute; inset: 0;
  background: radial-gradient(400px 200px at 80% 20%, rgba(34, 211, 238, .35) 0%, transparent 60%),
              radial-gradient(300px 150px at 20% 80%, rgba(249, 115, 22, .25) 0%, transparent 60%);
}
.matrix-thumb .ico {
  position: absolute; inset: 0;
  display: flex; align-items: center; justify-content: center;
  font-size: 3.2rem; z-index: 1;
}
.matrix-body { padding: 22px 24px 26px; flex: 1; display: flex; flex-direction: column; }
.matrix-body .tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-ink-3);
  background: rgba(34, 211, 238, .14);
  padding: 4px 10px;
  border-radius: 999px;
  margin-bottom: 12px;
  width: max-content;
}
.matrix-body h3 { margin-bottom: 10px; }
.matrix-body p { font-size: 0.95rem; flex: 1; }
.matrix-body .meta { margin-top: 18px; font-size: 0.82rem; color: var(--color-soft); display: flex; justify-content: space-between; font-family: var(--font-mono); }

/* ===== 步骤问答 ===== */
.steps-faq { background: linear-gradient(180deg, #fff 0%, #F7F8FC 100%); }
.steps-faq .grid { gap: 18px; }
.faq-card {
  background: #fff;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  padding: 26px 28px;
}
.faq-card h3 {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
}
.faq-card h3 .num {
  width: 30px; height: 30px;
  border-radius: 50%;
  background: var(--color-ink);
  color: var(--color-accent);
  display: inline-flex; align-items: center; justify-content: center;
  font-size: 0.9rem; font-family: var(--font-mono);
}
.faq-card ol {
  counter-reset: step;
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding-left: 0;
}
.faq-card ol li {
  counter-increment: step;
  position: relative;
  padding: 8px 12px 8px 44px;
  font-size: 0.95rem;
  color: var(--color-text);
  background: rgba(34, 211, 238, .06);
  border-radius: var(--radius-sm);
  line-height: 1.7;
}
.faq-card ol li::before {
  content: "第" counter(step, cjk-ideographic) "步";
  position: absolute;
  left: 10px;
  top: 8px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--color-ink-3);
  background: #fff;
  border: 1px solid rgba(34, 211, 238, .35);
  padding: 2px 6px;
  border-radius: 6px;
}

/* ===== 节点分布 ===== */
.coverage { background: #fff; }
.coverage .grid { gap: 24px; }
.region-card {
  padding: 24px;
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, #F7F8FC 0%, #fff 100%);
  border: 1px solid var(--color-line);
}
.region-card h4 {
  font-family: var(--font-serif);
  display: flex; justify-content: space-between; align-items: center;
  margin-bottom: 12px;
}
.region-card h4 .pill {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--color-success);
  background: rgba(16, 185, 129, .12);
  padding: 3px 8px;
  border-radius: 999px;
}
.region-card ul { display: flex; flex-wrap: wrap; gap: 6px; }
.region-card ul li {
  font-size: 0.85rem;
  padding: 4px 10px;
  background: #fff;
  border: 1px solid var(--color-line);
  border-radius: 999px;
  color: var(--color-muted);
}

/* ===== 公告 ===== */
.notice { background: var(--color-ink); color: #fff; }
.notice .grid { gap: 20px; }
.notice-card {
  padding: 24px;
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, .06);
  border: 1px solid rgba(255, 255, 255, .12);
}
.notice-card .date {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--color-accent);
}
.notice-card h4 { color: #fff; margin: 10px 0 8px; font-family: var(--font-serif); }
.notice-card p { color: rgba(255, 255, 255, .75); font-size: 0.95rem; }
.notice-card .tag-new {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--color-action);
  background: rgba(249, 115, 22, .2);
  padding: 2px 8px;
  border-radius: 4px;
  margin-left: 8px;
  vertical-align: middle;
}

/* ===== CTA大图 ===== */
.cta-banner {
  padding: 96px 0;
  background:
    radial-gradient(800px 400px at 20% 30%, rgba(34, 211, 238, .15) 0%, transparent 60%),
    linear-gradient(135deg, #0B1F4A 0%, #142B66 100%);
  color: #fff;
  text-align: center;
}
.cta-banner h2 { color: #fff; }
.cta-banner p { color: rgba(255, 255, 255, .8); margin: 16px auto 32px; max-width: 600px; }
.cta-banner .row { display: inline-flex; gap: 14px; flex-wrap: wrap; justify-content: center; }

/* ===== 页脚 ===== */
.site-footer {
  background: #07163A;
  color: rgba(255, 255, 255, .72);
  padding: 64px 0 24px;
}
.site-footer .footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr 1fr;
  gap: 32px;
  margin-bottom: 40px;
}
.site-footer h5 {
  color: #fff;
  font-family: var(--font-sans);
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 16px;
}
.site-footer ul li { margin-bottom: 10px; font-size: 0.9rem; }
.site-footer ul li a:hover { color: var(--color-accent); }
.site-footer .brand-line { display: flex; align-items: center; gap: 10px; margin-bottom: 14px; }
.site-footer .brand-line .brand-mark { background: rgba(255, 255, 255, .08); }
.site-footer .desc { font-size: 0.9rem; line-height: 1.7; }
.site-footer .legal {
  border-top: 1px solid rgba(255, 255, 255, .08);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 0.82rem;
  color: rgba(255, 255, 255, .5);
}
.site-footer .legal a { color: rgba(255, 255, 255, .7); }
.site-footer .legal a:hover { color: var(--color-accent); }

/* ===== 内页通用 ===== */
.page-hero {
  padding: 96px 0 56px;
  background:
    radial-gradient(800px 400px at 80% 20%, rgba(34, 211, 238, .12) 0%, transparent 60%),
    linear-gradient(180deg, #0B1F4A 0%, #142B66 100%);
  color: #fff;
  text-align: center;
}
.page-hero h1 { color: #fff; }
.page-hero .bread {
  margin-top: 14px;
  color: rgba(255, 255, 255, .7);
  font-size: 0.9rem;
}
.page-hero .bread a { color: rgba(255, 255, 255, .9); }
.page-hero .bread a:hover { color: var(--color-accent); }
.page-hero .desc { color: rgba(255, 255, 255, .82); margin-top: 14px; max-width: 720px; margin-left: auto; margin-right: auto; }

/* 下载页卡片 */
.dl-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
.dl-card {
  background: #fff;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  padding: 26px;
  display: grid;
  grid-template-columns: 64px 1fr auto;
  gap: 20px;
  align-items: center;
  transition: transform .25s, box-shadow .25s;
}
.dl-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); }
.dl-card .ico {
  width: 64px; height: 64px;
  border-radius: 16px;
  display: inline-flex; align-items: center; justify-content: center;
  background: linear-gradient(135deg, var(--color-ink) 0%, var(--color-ink-3) 100%);
  color: #fff;
}
.dl-card .ico.ios { background: linear-gradient(135deg, #000 0%, #1f1f1f 100%); }
.dl-card .ico.android { background: linear-gradient(135deg, #10B981 0%, #059669 100%); }
.dl-card .ico.mac { background: linear-gradient(135deg, #6366F1 0%, #4338CA 100%); }
.dl-card .ico.win { background: linear-gradient(135deg, #0EA5E9 0%, #0369A1 100%); }
.dl-card h3 { font-family: var(--font-serif); margin-bottom: 6px; }
.dl-card .meta {
  display: flex; gap: 14px; flex-wrap: wrap;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--color-muted);
}
.dl-card .meta .live {
  color: var(--color-success);
  display: inline-flex; align-items: center; gap: 4px;
}
.dl-card .meta .live::before {
  content: ""; width: 6px; height: 6px; border-radius: 50%;
  background: var(--color-success);
  box-shadow: 0 0 0 0 rgba(16, 185, 129, .6);
  animation: pulse 2s infinite;
}
.dl-card .btn { white-space: nowrap; }

/* 时间线（更新日志） */
.timeline { position: relative; padding-left: 32px; }
.timeline::before {
  content: ""; position: absolute; left: 12px; top: 6px; bottom: 6px;
  width: 2px; background: var(--color-line);
}
.timeline-item { position: relative; padding: 18px 0 18px 20px; }
.timeline-item::before {
  content: ""; position: absolute; left: -26px; top: 24px;
  width: 14px; height: 14px;
  border-radius: 50%; background: #fff;
  border: 3px solid var(--color-accent-2);
}
.timeline-item .ver { font-family: var(--font-mono); color: var(--color-ink-3); font-size: 0.85rem; font-weight: 700; }
.timeline-item .date { font-family: var(--font-mono); color: var(--color-soft); font-size: 0.8rem; margin-left: 10px; }
.timeline-item h4 { margin: 6px 0 10px; }
.timeline-item ul { display: flex; flex-direction: column; gap: 6px; }
.timeline-item ul li { font-size: 0.92rem; color: var(--color-muted); padding-left: 22px; position: relative; line-height: 1.7; }
.timeline-item ul li::before {
  content: ""; position: absolute; left: 6px; top: 12px;
  width: 6px; height: 6px; border-radius: 50%; background: var(--color-accent-2);
}

/* 安装步骤 */
.install-steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.install-step {
  background: #fff;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-line);
  padding: 24px;
  position: relative;
}
.install-step .ord {
  position: absolute; top: -14px; left: 24px;
  background: var(--color-ink); color: var(--color-accent);
  width: 32px; height: 32px; border-radius: 50%;
  display: inline-flex; align-items: center; justify-content: center;
  font-family: var(--font-mono); font-weight: 700;
}
.install-step h4 { margin: 8px 0 8px; font-family: var(--font-serif); }
.install-step p { font-size: 0.92rem; }

/* 文章页（产品介绍 / 使用指南 / 关于） */
.prose { max-width: 880px; margin: 0 auto; }
.prose h2 { margin: 48px 0 16px; font-size: 1.6rem; }
.prose h3 { margin: 32px 0 12px; font-size: 1.2rem; }
.prose p { margin-bottom: 16px; font-size: 1rem; line-height: 1.85; color: var(--color-text); }
.prose ul { padding-left: 24px; margin-bottom: 16px; }
.prose ul li { list-style: disc; margin-bottom: 6px; color: var(--color-text); }
.prose blockquote {
  border-left: 4px solid var(--color-accent-2);
  padding: 12px 18px;
  background: rgba(34, 211, 238, .06);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin: 24px 0;
  color: var(--color-text);
}
.prose code {
  font-family: var(--font-mono);
  background: rgba(11, 31, 74, .06);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.92em;
  color: var(--color-ink);
}
.prose .toc {
  background: #fff;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  padding: 22px 26px;
  margin-bottom: 32px;
}
.prose .toc h4 { margin-bottom: 10px; font-family: var(--font-serif); }
.prose .toc ol { padding-left: 22px; }
.prose .toc ol li { list-style: decimal; margin-bottom: 4px; }

/* 联系我们 */
.contact-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
.contact-card {
  background: #fff;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  padding: 26px;
}
.contact-card h4 { font-family: var(--font-serif); margin-bottom: 8px; }
.contact-card .ch {
  font-family: var(--font-mono);
  color: var(--color-ink-3);
  font-size: 0.85rem;
  margin-bottom: 6px;
}
.contact-card p { font-size: 0.95rem; }

.contact-form {
  background: #fff;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  padding: 32px;
  margin-top: 32px;
}
.contact-form .row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-bottom: 16px; }
.contact-form label { display: block; font-size: 0.88rem; color: var(--color-muted); margin-bottom: 6px; }
.contact-form input, .contact-form textarea, .contact-form select {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-sm);
  font-family: inherit;
  font-size: 0.95rem;
  color: var(--color-text);
  background: #fff;
  transition: border-color .2s;
}
.contact-form input:focus, .contact-form textarea:focus, .contact-form select:focus {
  outline: none;
  border-color: var(--color-accent-2);
}
.contact-form textarea { min-height: 140px; resize: vertical; }

/* 通用文字工具 */
.text-center { text-align: center; }
.mb-12 { margin-bottom: 48px; }
.mb-8 { margin-bottom: 32px; }
.mt-4 { margin-top: 16px; }
.mt-8 { margin-top: 32px; }

/* ===== 响应式 ===== */
@media (max-width: 960px) {
  .hero-inner { grid-template-columns: 1fr; }
  .node-card { margin-top: 16px; }
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .install-steps { grid-template-columns: repeat(2, 1fr); }
  .site-footer .footer-grid { grid-template-columns: 1fr 1fr; }
  .dl-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .contact-form .row { grid-template-columns: 1fr; }
  section { padding: 64px 0; }
  .hero { padding: 80px 0 64px; }
}

@media (max-width: 640px) {
  .burger { display: inline-flex; }
  .nav-list {
    position: absolute;
    top: 72px; left: 0; right: 0;
    background: #fff;
    flex-direction: column;
    padding: 12px;
    gap: 4px;
    box-shadow: var(--shadow-md);
    transform: translateY(-12px);
    opacity: 0;
    pointer-events: none;
    transition: .25s ease;
    border-bottom: 1px solid var(--color-line);
  }
  .nav-list.open { transform: translateY(0); opacity: 1; pointer-events: auto; }
  .nav-list a { display: block; padding: 12px 14px; }
  .install-steps { grid-template-columns: 1fr; }
  .site-footer .footer-grid { grid-template-columns: 1fr; }
  .hero-meta { gap: 20px; }
  .dl-card { grid-template-columns: 56px 1fr; }
  .dl-card .btn { grid-column: 1 / -1; justify-self: start; }
}