/* ============================================================
   mdo 墨斗官网 · 墨韵主题
   家族设计语言（xrt/xs/xge）+ 墨色/宣纸白/朱砂识别
   ============================================================ */

:root {
  /* 墨底 */
  --bg0: #131311;
  --bg1: #1a1a18;
  --bg2: #22221f;
  --bg3: #2b2b27;
  --line:      rgba(236,231,219,.12);
  --line-soft: rgba(236,231,219,.07);
  --ink:       #ece7db;
  --ink-dim:   #b3ac9d;
  --ink-faint: #7c776b;

  --cinnabar:      #d4553a;
  --cinnabar-deep: #b23a2a;
  --cinnabar-soft: #e07a5f;
  --indigo:        #6b7fb3;
  --indigo-soft:   #93a3cd;
  --gold:          #c9a86a;
  --green:         #7fb069;

  --grad-brand: linear-gradient(120deg,#e8b98f 0%,#d4553a 52%,#b23a2a 100%);
  --glow-cinnabar: rgba(212,85,58,.12);
  --glow-indigo:   rgba(107,127,179,.10);

  --font-ui: "Inter","Segoe UI","PingFang SC","HarmonyOS Sans SC",
             "Microsoft YaHei",system-ui,sans-serif;
  --font-display: "Noto Serif SC","Source Han Serif SC","STSong","SimSun",
             "PingFang SC","Microsoft YaHei",serif;
  --font-mono: "JetBrains Mono","Cascadia Code","SF Mono",Consolas,
             "Courier New",monospace;

  --radius: 12px;
  --radius-lg: 18px;
  --max-w: 1180px;
  --nav-h: 64px;
  --ease: cubic-bezier(.22,.7,.25,1);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-h) + 16px);
}

body {
  background: var(--bg0);
  color: var(--ink);
  font-family: var(--font-ui);
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

::selection { background: rgba(212,85,58,.32); color: #fff; }

a { color: var(--indigo-soft); text-decoration: none; }
a:hover { color: var(--cinnabar-soft); }

h1,h2,h3,h4 { font-family: var(--font-display); font-weight: 700; line-height: 1.28; }

:focus-visible {
  outline: 2px solid var(--cinnabar);
  outline-offset: 2px;
  border-radius: 4px;
}

code { font-family: var(--font-mono); font-size: .86em; }

.container { max-width: var(--max-w); margin: 0 auto; padding: 0 28px; }

/* ---------- 背景场景：宣纸微光 + 朱砂/黛青晕 ---------- */
.bg-scene {
  position: fixed; inset: 0; z-index: -1; pointer-events: none;
  background:
    radial-gradient(900px 520px at 12% -6%, var(--glow-cinnabar), transparent 62%),
    radial-gradient(820px 540px at 96% 14%, var(--glow-indigo), transparent 60%),
    repeating-linear-gradient(0deg, rgba(236,231,219,.012) 0 1px, transparent 1px 3px),
    var(--bg0);
}

/* ---------- 无障碍 ---------- */
.skip-link {
  position: absolute; left: 16px; top: -48px; z-index: 200;
  padding: 8px 16px; border-radius: 8px;
  background: var(--cinnabar); color: #fff; font-size: 14px;
  transition: top .2s var(--ease);
}
.skip-link:focus { top: 12px; }

/* ---------- 导航 ---------- */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  height: var(--nav-h);
  background: rgba(19,19,17,.78);
  -webkit-backdrop-filter: blur(14px); backdrop-filter: blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color .3s var(--ease), background .3s var(--ease);
}
.nav.scrolled { border-bottom-color: var(--line-soft); background: rgba(19,19,17,.92); }
.nav-inner {
  max-width: var(--max-w); margin: 0 auto; padding: 0 28px;
  height: 100%; display: flex; align-items: center; gap: 26px;
}
.nav-logo {
  display: flex; align-items: center; gap: 10px;
  color: var(--ink); font-family: var(--font-display); font-size: 19px;
  letter-spacing: .02em;
}
.nav-logo svg { width: 28px; height: 28px; display: block; }
.nav-logo em {
  font-style: normal; font-family: var(--font-mono); font-size: 11px;
  color: var(--ink-faint); border: 1px solid var(--line);
  padding: 1px 7px; border-radius: 999px; margin-left: 2px;
}
.nav-links {
  display: flex; align-items: center; gap: 4px;
  list-style: none; margin-left: auto;
}
.nav-links > li > a, .nav-dropdown > summary {
  display: block; padding: 8px 13px; border-radius: 8px;
  color: var(--ink-dim); font-size: 14.5px; cursor: pointer;
  transition: color .2s, background .2s;
  user-select: none; white-space: nowrap;
}
.nav-links > li > a:hover, .nav-dropdown > summary:hover {
  color: var(--ink); background: rgba(236,231,219,.06);
}
.nav-dropdown { position: relative; }
.nav-dropdown > summary { list-style: none; }
.nav-dropdown > summary::-webkit-details-marker { display: none; }
.nav-dropdown > summary::after { content: " ▾"; font-size: 10px; color: var(--ink-faint); }
.nav-dropdown[open] > summary { color: var(--ink); }
.nav-dropdown > div {
  position: absolute; top: calc(100% + 6px); left: 0; min-width: 168px;
  background: var(--bg2); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 6px;
  box-shadow: 0 16px 42px rgba(0,0,0,.45);
  display: flex; flex-direction: column;
}
.nav-dropdown > div > a, .nav-dropdown > div > span {
  padding: 8px 12px; border-radius: 8px; font-size: 14px;
  color: var(--ink-dim);
}
.nav-dropdown > div > a:hover { color: var(--ink); background: rgba(236,231,219,.06); }
.nav-dropdown .lang-cur { color: var(--cinnabar-soft); cursor: default; }
.nav-cta {
  margin-left: 8px; padding: 8px 18px; border-radius: 10px;
  background: var(--cinnabar); color: #fff; font-size: 14px; font-weight: 600;
  transition: background .2s, transform .2s;
}
.nav-cta:hover { background: var(--cinnabar-deep); color: #fff; transform: translateY(-1px); }

.nav-toggle {
  display: none; margin-left: auto;
  width: 42px; height: 42px; border: 1px solid var(--line);
  border-radius: 10px; background: transparent; cursor: pointer;
  position: relative;
}
.nav-toggle span {
  position: absolute; left: 11px; right: 11px; height: 2px;
  background: var(--ink); border-radius: 2px;
  transition: transform .25s var(--ease), opacity .2s, top .25s var(--ease);
}
.nav-toggle span:nth-child(1) { top: 14px; }
.nav-toggle span:nth-child(2) { top: 20px; }
.nav-toggle span:nth-child(3) { top: 26px; }
.nav-toggle[aria-expanded="true"] span:nth-child(1) { top: 20px; transform: rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { top: 20px; transform: rotate(-45deg); }

.nav-drawer {
  display: none; position: fixed; top: var(--nav-h); left: 0; right: 0; z-index: 99;
  background: var(--bg1); border-bottom: 1px solid var(--line);
  padding: 14px 28px 22px; flex-direction: column; gap: 2px;
}
.nav-drawer.open { display: flex; }
.nav-drawer > a, .nav-drawer > details > summary {
  padding: 11px 6px; color: var(--ink-dim); font-size: 16px;
  border-bottom: 1px solid var(--line-soft); cursor: pointer;
}
.nav-drawer > a:hover, .nav-drawer > details > summary:hover { color: var(--ink); }
.nav-drawer details > summary { list-style: none; }
.nav-drawer details > summary::-webkit-details-marker { display: none; }
.nav-drawer details > div { display: flex; flex-direction: column; padding-left: 12px; }
.nav-drawer details > div > a { padding: 9px 6px; font-size: 15px; color: var(--ink-dim); }
.nav-drawer .drawer-cta {
  margin-top: 14px; text-align: center; padding: 12px;
  background: var(--cinnabar); color: #fff; border-radius: 10px; font-weight: 600;
}

/* ---------- Hero ---------- */
.hero {
  position: relative; padding: calc(var(--nav-h) + 64px) 0 40px;
}
.hero-inner {
  max-width: var(--max-w); margin: 0 auto; padding: 0 28px;
  display: grid; grid-template-columns: 1.04fr .96fr;
  gap: 56px; align-items: center;
}
.hero-badge {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 6px 14px 6px 7px; border: 1px solid var(--line);
  border-radius: 999px; background: rgba(236,231,219,.04);
  font-size: 13px; color: var(--ink-dim); margin-bottom: 26px;
}
.seal {
  display: inline-flex; align-items: center; justify-content: center;
  width: 22px; height: 22px; border-radius: 5px;
  background: var(--cinnabar); color: #fff;
  font-family: var(--font-mono); font-size: 9px; font-weight: 700;
  letter-spacing: .04em;
  box-shadow: inset 0 0 0 1px rgba(255,255,255,.22);
}
.hero h1 {
  font-size: clamp(34px, 4.6vw, 54px); letter-spacing: .01em; margin-bottom: 4px;
}
.grad {
  background: var(--grad-brand);
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent; color: transparent;
}
.ink-line {
  position: relative; height: 2px; margin: 22px 0 20px;
  background: var(--line-soft); border-radius: 2px; overflow: visible;
}
.ink-line i {
  position: absolute; inset: 0; transform-origin: left center;
  transform: scaleX(0); border-radius: 2px;
  background: linear-gradient(90deg, var(--cinnabar-deep), var(--cinnabar) 70%, var(--cinnabar-soft));
}
.ink-line i::after {
  content: ""; position: absolute; right: -3px; top: 50%;
  width: 8px; height: 8px; border-radius: 50%;
  transform: translateY(-50%) scale(0); background: var(--cinnabar);
  transition: transform .3s var(--ease) .5s;
}
.ink-line.snapped i { animation: snap .6s var(--ease) forwards; }
.ink-line.snapped i::after { transform: translateY(-50%) scale(1); }
@keyframes snap { to { transform: scaleX(1); } }

.hero-desc { color: var(--ink-dim); font-size: 17px; max-width: 34em; }
.hero-desc strong { color: var(--ink); font-weight: 600; }
.hero-actions { display: flex; gap: 14px; margin: 30px 0 18px; flex-wrap: wrap; }
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 26px; border-radius: 12px; font-size: 15.5px; font-weight: 600;
  border: 1px solid transparent; cursor: pointer;
  transition: transform .2s var(--ease), background .2s, border-color .2s, box-shadow .2s;
}
.btn-primary {
  background: var(--cinnabar); color: #fff;
  box-shadow: 0 8px 26px rgba(212,85,58,.28);
}
.btn-primary:hover { background: var(--cinnabar-deep); color: #fff; transform: translateY(-2px); }
.btn-ghost { border-color: var(--line); color: var(--ink); background: rgba(236,231,219,.03); }
.btn-ghost:hover { border-color: rgba(236,231,219,.3); background: rgba(236,231,219,.07); color: var(--ink); }
.hero-assurance { font-size: 13.5px; color: var(--ink-faint); letter-spacing: .02em; }
.hero-assurance span { margin: 0 7px; color: var(--cinnabar); }

.hero-stats {
  max-width: var(--max-w); margin: 56px auto 0; padding: 0 28px;
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px;
  background: var(--line-soft); border: 1px solid var(--line-soft);
  border-radius: var(--radius-lg); overflow: hidden;
}
.stat-cell {
  display: block; padding: 22px 26px; background: var(--bg1);
  color: var(--ink); transition: background .25s;
}
.stat-cell:hover { background: var(--bg2); }
.stat-cell .num {
  font-family: var(--font-mono); font-size: 27px; font-weight: 700;
  color: var(--gold); line-height: 1.2;
}
.stat-cell .num i { font-style: normal; font-size: 15px; margin-left: 3px; color: var(--ink-faint); }
.stat-cell .lbl { font-size: 13px; color: var(--ink-faint); margin-top: 5px; }

/* ---------- 应用界面 mock ---------- */
.mock {
  border: 1px solid var(--line); border-radius: var(--radius-lg);
  background: var(--bg1); overflow: hidden;
  box-shadow: 0 30px 70px rgba(0,0,0,.5), 0 0 0 1px rgba(236,231,219,.02);
}
.mock-bar {
  display: flex; align-items: center; gap: 7px;
  padding: 12px 16px; border-bottom: 1px solid var(--line-soft); background: var(--bg2);
}
.mock-bar i {
  width: 11px; height: 11px; border-radius: 50%;
  background: var(--bg3); border: 1px solid var(--line);
}
.mock-bar i:first-child { background: var(--cinnabar-deep); border-color: transparent; }
.mock-bar span {
  margin-left: 10px; font-family: var(--font-mono);
  font-size: 12px; color: var(--ink-faint);
}
.mock-body { display: grid; grid-template-columns: 148px 1fr; min-height: 340px; }
.mock-side { border-right: 1px solid var(--line-soft); padding: 14px 10px; font-size: 12.5px; }
.ms-proj {
  font-family: var(--font-mono); font-size: 11px; color: var(--gold);
  padding: 3px 8px; margin-bottom: 8px; letter-spacing: .03em;
}
.ms-item { padding: 5px 8px; border-radius: 6px; color: var(--ink-faint); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.ms-item.l1 { padding-left: 18px; }
.ms-item.on { background: rgba(236,231,219,.07); color: var(--ink); }
.ms-pin { color: var(--gold); margin-right: 4px; }
.mock-chat { padding: 16px 18px; display: flex; flex-direction: column; gap: 12px; font-size: 13.5px; }
.mc-role {
  font-family: var(--font-mono); font-size: 10.5px; letter-spacing: .08em;
  color: var(--ink-faint); margin-bottom: 3px;
}
.mc-user, .mc-ai {
  padding: 10px 13px; border-radius: 10px; line-height: 1.6;
}
.mc-user { background: rgba(236,231,219,.06); color: var(--ink); align-self: flex-end; max-width: 88%; }
.mc-ai {
  border: 1px solid var(--line-soft); background: var(--bg2); color: var(--ink-dim);
  max-width: 96%;
}
.mc-ai .cursor {
  display: inline-block; width: 7px; height: 15px; margin-left: 2px;
  background: var(--cinnabar); vertical-align: -2px;
  animation: blink 1.1s steps(1) infinite;
}
@keyframes blink { 50% { opacity: 0; } }
.mc-tool {
  border: 1px solid var(--line-soft); border-left: 2px solid var(--indigo);
  border-radius: 8px; padding: 9px 12px; max-width: 96%;
  font-family: var(--font-mono); font-size: 12px; color: var(--ink-dim);
  display: flex; align-items: center; gap: 9px;
}
.mc-tool .ok { color: var(--green); }
.mc-tool b { color: var(--ink); font-weight: 600; }
.mc-approve {
  border: 1px solid rgba(212,85,58,.45); border-radius: 8px;
  padding: 9px 12px; max-width: 96%;
  display: flex; align-items: center; gap: 10px; flex-wrap: wrap;
  font-size: 12.5px; color: var(--ink-dim); background: rgba(212,85,58,.06);
}
.mc-approve .btns { margin-left: auto; display: flex; gap: 7px; }
.mc-approve .b {
  font-family: var(--font-mono); font-size: 11px; padding: 3px 10px;
  border-radius: 6px; border: 1px solid var(--line); color: var(--ink-dim);
}
.mc-approve .b.yes { background: var(--cinnabar); border-color: transparent; color: #fff; }
.mc-tokens {
  margin-top: auto; padding-top: 4px; text-align: right;
  font-family: var(--font-mono); font-size: 10.5px; color: var(--ink-faint);
}

/* ---------- Section 骨架 ---------- */
.section { padding: 86px 0; }
.section-alt { background: rgba(236,231,219,.018); border-top: 1px solid var(--line-soft); border-bottom: 1px solid var(--line-soft); }
.section-head { max-width: 720px; margin-bottom: 46px; }
.eyebrow {
  font-family: var(--font-mono); font-size: 12px; letter-spacing: .22em;
  text-transform: uppercase; color: var(--cinnabar-soft); margin-bottom: 12px;
}
.section-title { font-size: clamp(26px, 3vw, 34px); margin-bottom: 14px; }
.section-lead { color: var(--ink-dim); font-size: 16.5px; }

/* ---------- 价值卡 ---------- */
.value-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.value-card {
  position: relative; padding: 26px 24px;
  border: 1px solid var(--line-soft); border-radius: var(--radius-lg);
  background: linear-gradient(180deg, var(--bg1), var(--bg0));
  display: flex; flex-direction: column; gap: 10px;
  transition: border-color .25s, transform .25s var(--ease);
}
.value-card:hover { border-color: rgba(212,85,58,.4); transform: translateY(-3px); }
.value-no {
  font-family: var(--font-mono); font-size: 11.5px; letter-spacing: .14em;
  color: var(--ink-faint);
}
.value-no b { color: var(--cinnabar); font-weight: 700; }
.value-card h3 { font-size: 19px; }
.value-card p { color: var(--ink-dim); font-size: 14.5px; flex: 1; }
.value-card > a { font-size: 14px; color: var(--cinnabar-soft); margin-top: 6px; }
.value-card > a:hover { color: var(--cinnabar); }

/* ---------- Bento ---------- */
.bento { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.b-card {
  padding: 26px 24px; border: 1px solid var(--line-soft); border-radius: var(--radius-lg);
  background: var(--bg1); display: flex; flex-direction: column; gap: 10px;
  transition: border-color .25s, background .25s;
}
.b-card:hover { border-color: rgba(107,127,179,.45); background: var(--bg2); }
.capability-label {
  font-family: var(--font-mono); font-size: 11px; letter-spacing: .2em;
  color: var(--gold);
}
.b-card h3 { font-size: 18.5px; }
.b-card p { color: var(--ink-dim); font-size: 14.5px; flex: 1; }
.b-card > a { font-size: 14px; color: var(--indigo-soft); }
.b-card > a:hover { color: var(--cinnabar-soft); }
.b-card.wide { grid-column: span 2; }
.b-card svg.ic { width: 26px; height: 26px; stroke: var(--ink-dim); }

/* ---------- 架构 ---------- */
.arch-wrap {
  display: grid; grid-template-columns: 1.1fr .9fr; gap: 16px; align-items: stretch;
}
.arch-panel {
  border: 1px solid var(--line-soft); border-radius: var(--radius-lg);
  background: var(--bg1); padding: 28px;
}
.arch-panel h3 { font-size: 20px; margin-bottom: 6px; }
.arch-panel h3 .tagchip {
  font-family: var(--font-mono); font-size: 11px; color: var(--ink-faint);
  border: 1px solid var(--line); padding: 2px 8px; border-radius: 999px;
  vertical-align: 3px; margin-left: 8px;
}
.arch-sub { color: var(--ink-faint); font-size: 13.5px; margin-bottom: 18px; }
.arch-stack { display: flex; flex-direction: column; gap: 8px; }
.arch-layer {
  border: 1px solid var(--line-soft); border-radius: var(--radius);
  padding: 13px 16px; background: var(--bg2);
  border-left: 3px solid var(--layer-c, var(--indigo));
  display: flex; flex-direction: column; gap: 7px;
  transition: transform .2s var(--ease);
}
.arch-layer:hover { transform: translateX(4px); }
.arch-layer .a-name {
  font-family: var(--font-display); font-size: 15.5px; font-weight: 700; color: var(--ink);
}
.arch-layer .a-name small { font-family: var(--font-ui); font-weight: 400; color: var(--ink-faint); font-size: 12.5px; margin-left: 8px; }
.a-mods { display: flex; flex-wrap: wrap; gap: 6px; }
.a-mods code {
  font-size: 11.5px; color: var(--ink-dim);
  background: rgba(236,231,219,.05); border: 1px solid var(--line-soft);
  padding: 2px 9px; border-radius: 6px;
}
.arch-principles { display: flex; flex-direction: column; gap: 18px; }
.arch-principles article {
  padding: 18px 20px; border: 1px solid var(--line-soft); border-radius: var(--radius);
  background: var(--bg1);
}
.arch-principles h4 { font-size: 16px; margin-bottom: 6px; color: var(--ink); }
.arch-principles p { color: var(--ink-dim); font-size: 14px; }
.arch-principles code { color: var(--gold); font-size: .9em; }

/* ---------- 平台 ---------- */
.platform-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.p-card {
  border: 1px solid var(--line-soft); border-radius: var(--radius-lg);
  background: var(--bg1); padding: 26px 24px;
  display: flex; flex-direction: column; gap: 10px;
}
.p-card .p-os {
  display: flex; align-items: center; gap: 10px;
  font-family: var(--font-display); font-size: 18px; font-weight: 700;
}
.p-card .p-os svg { width: 22px; height: 22px; stroke: var(--cinnabar-soft); }
.p-card p { color: var(--ink-dim); font-size: 14.5px; }
.p-card p small { display: block; margin-top: 6px; color: var(--ink-faint); font-size: 12.5px; }
.p-card .code-block { margin-top: auto; }

/* ---------- 代码块 ---------- */
.code-block {
  border: 1px solid var(--line-soft); border-radius: 10px; overflow: hidden;
  background: var(--bg3);
}
.code-head {
  display: flex; align-items: center; justify-content: space-between;
  padding: 7px 12px; border-bottom: 1px solid var(--line-soft);
  background: rgba(236,231,219,.03);
}
.code-head .fname { font-family: var(--font-mono); font-size: 11.5px; color: var(--ink-faint); }
.copy-btn {
  font-family: var(--font-mono); font-size: 11px; cursor: pointer;
  color: var(--ink-faint); background: transparent;
  border: 1px solid var(--line); border-radius: 6px; padding: 2px 10px;
  transition: color .2s, border-color .2s;
}
.copy-btn:hover { color: var(--ink); border-color: rgba(236,231,219,.3); }
.code-body { padding: 13px 15px; overflow-x: auto; }
.code-body pre { font-family: var(--font-mono); font-size: 12.8px; line-height: 1.75; color: var(--ink-dim); }
.code-body .pp  { color: var(--cinnabar-soft); }
.code-body .kw  { color: var(--indigo-soft); }
.code-body .str { color: var(--green); }
.code-body .fn  { color: var(--gold); }
.code-body .type{ color: var(--indigo-soft); }
.code-body .num { color: var(--gold); }
.code-body .cm  { color: var(--ink-faint); }

/* ---------- 工程品质 evidence ---------- */
.evidence-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.evidence-card {
  border: 1px solid var(--line-soft); border-radius: var(--radius-lg);
  background: linear-gradient(180deg, var(--bg1), var(--bg0));
  padding: 30px 28px; display: flex; flex-direction: column; gap: 12px;
}
.evidence-card .capability-label { color: var(--cinnabar-soft); }
.evidence-number {
  font-family: var(--font-mono); font-size: 44px; font-weight: 700;
  color: var(--ink); line-height: 1.1;
}
.evidence-number small {
  font-family: var(--font-ui); font-size: 15px; font-weight: 400;
  color: var(--ink-faint); margin-left: 10px;
}
.evidence-card h3 { font-size: 18px; }
.evidence-card p { color: var(--ink-dim); font-size: 14.5px; flex: 1; }
.evidence-card > a { font-size: 14px; color: var(--cinnabar-soft); }
.evidence-card > a:hover { color: var(--cinnabar); }
.quality-note { margin-top: 22px; text-align: center; color: var(--ink-faint); font-size: 13.5px; }
.quality-note b { color: var(--gold); font-weight: 600; }

/* ---------- Start banner ---------- */
.start-banner {
  display: flex; align-items: center; justify-content: space-between; gap: 30px;
  border: 1px solid rgba(212,85,58,.35); border-radius: var(--radius-lg);
  background:
    radial-gradient(560px 200px at 12% 0%, rgba(212,85,58,.14), transparent 70%),
    var(--bg1);
  padding: 44px 46px;
}
.start-banner .eyebrow { margin-bottom: 8px; }
.start-banner h2 { font-size: clamp(22px, 2.6vw, 30px); margin-bottom: 10px; }
.start-banner p { color: var(--ink-dim); max-width: 40em; }

/* ---------- 友情链接 ---------- */
.friends { padding: 64px 0 30px; }
.friends-title {
  font-size: 15px; color: var(--ink-faint); letter-spacing: .18em;
  text-align: center; margin-bottom: 26px; font-family: var(--font-ui); font-weight: 400;
}
.friends-main {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px;
}
.friend-card {
  display: flex; align-items: center; gap: 14px;
  border: 1px solid var(--line-soft); border-radius: var(--radius);
  padding: 14px 18px; background: rgba(236,231,219,.02);
  transition: border-color .25s, background .25s;
}
.friend-card:hover { border-color: var(--line); background: rgba(236,231,219,.05); }
.friend-logo {
  flex-shrink: 0; width: 136px; height: 44px;
  display: flex; align-items: center; justify-content: center;
  background: #ffffff; border-radius: 9px; padding: 6px;
}
.friend-logo img { max-width: 100%; max-height: 100%; object-fit: contain; display: block; }
.friend-text { display: flex; flex-direction: column; min-width: 0; }
.friend-name { color: var(--ink); font-size: 14px; font-weight: 600; }
.friend-desc { color: var(--ink-faint); font-size: 12px; line-height: 1.5; }

/* ---------- Footer ---------- */
.footer {
  margin-top: 40px; border-top: 1px solid var(--line-soft);
  background: var(--bg1); padding: 52px 0 34px;
}
.footer-inner {
  display: grid; grid-template-columns: 1.4fr 1fr 1fr 1.2fr; gap: 34px;
}
.footer-brand { display: flex; flex-direction: column; gap: 10px; }
.footer-brand .fb-name {
  display: flex; align-items: center; gap: 10px;
  font-family: var(--font-display); font-size: 20px;
}
.footer-brand .fb-name .seal { width: 26px; height: 26px; font-size: 10px; }
.footer-brand p { color: var(--ink-faint); font-size: 13.5px; }
.footer h4 {
  font-family: var(--font-ui); font-size: 13px; letter-spacing: .1em;
  color: var(--ink-dim); margin-bottom: 14px; font-weight: 600;
}
.footer ul { list-style: none; display: flex; flex-direction: column; gap: 9px; }
.footer ul a { color: var(--ink-faint); font-size: 14px; }
.footer ul a:hover { color: var(--ink); }
.footer-note { color: var(--ink-faint); font-size: 12.5px; line-height: 1.7; }
.footer-bottom {
  max-width: var(--max-w); margin: 40px auto 0; padding: 20px 28px 0;
  border-top: 1px solid var(--line-soft);
  display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap;
  color: var(--ink-faint); font-size: 12.5px;
}

/* ---------- 子页面头部 ---------- */
.page-hero { padding: calc(var(--nav-h) + 58px) 0 34px; }
.page-hero h1 { font-size: clamp(30px, 4vw, 42px); margin-bottom: 12px; }
.page-hero .section-lead { max-width: 46em; }
.breadcrumb {
  font-family: var(--font-mono); font-size: 12px; color: var(--ink-faint);
  margin-bottom: 18px;
}
.breadcrumb a { color: var(--ink-faint); }
.breadcrumb a:hover { color: var(--cinnabar-soft); }

/* ---------- 下载页 ---------- */
.dl-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
.dl-card {
  border: 1px solid var(--line-soft); border-radius: var(--radius-lg);
  background: var(--bg1); padding: 30px 28px; min-width: 0;
  display: flex; flex-direction: column; gap: 14px;
  transition: border-color .25s;
}
.dl-card:hover { border-color: rgba(212,85,58,.4); }
/* Download actions remain available before scroll observers or JS run. */
.dl-card.reveal { opacity: 1; transform: none; }
.dl-head { display: flex; align-items: center; gap: 14px; }
.dl-head svg { width: 34px; height: 34px; stroke: var(--cinnabar-soft); flex-shrink: 0; }
.dl-head h2 { font-size: 21px; }
.dl-head .dl-tag {
  font-family: var(--font-mono); font-size: 10.5px; color: var(--gold);
  border: 1px solid rgba(201,168,106,.4); padding: 2px 8px; border-radius: 999px;
  margin-left: auto; white-space: nowrap;
}
.dl-meta {
  display: flex; flex-wrap: wrap; gap: 8px 18px;
  font-family: var(--font-mono); font-size: 12.5px; color: var(--ink-faint);
}
.dl-meta b { color: var(--ink-dim); font-weight: 600; }
.dl-desc { color: var(--ink-dim); font-size: 14.5px; }
.dl-sha {
  display: flex; align-items: center; gap: 10px;
  font-family: var(--font-mono); font-size: 11.5px; color: var(--ink-faint);
  border: 1px dashed var(--line); border-radius: 8px; padding: 8px 12px;
  overflow: hidden;
}
.dl-sha span { flex-shrink: 0; }
.dl-sha code { min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; flex: 1; color: var(--ink-dim); }
.dl-card > .dl-sha, .dl-variant > .dl-sha { margin-top: auto; }
.dl-card .btn { justify-content: center; margin-top: 0; }
.dl-steps { margin: 0; padding-left: 18px; color: var(--ink-dim); font-size: 14px; }
.dl-steps li { margin-bottom: 5px; }
.callout {
  margin-top: 26px; border: 1px solid var(--line-soft); border-radius: var(--radius);
  border-left: 3px solid var(--indigo);
  background: var(--bg1); padding: 18px 22px; color: var(--ink-dim); font-size: 14.5px;
}
.callout b { color: var(--ink); }
.callout a { color: var(--indigo-soft); }
.callout-warn { border-left-color: var(--cinnabar); }

/* ---------- 指南页 ---------- */
.guide-layout { display: grid; grid-template-columns: 218px 1fr; gap: 44px; align-items: start; }
.guide-toc {
  position: sticky; top: calc(var(--nav-h) + 24px);
  border-left: 2px solid var(--line-soft); padding-left: 18px;
  display: flex; flex-direction: column; gap: 4px;
}
.guide-toc a {
  color: var(--ink-faint); font-size: 13.5px; padding: 5px 8px; border-radius: 6px;
}
.guide-toc a:hover, .guide-toc a.on { color: var(--ink); background: rgba(236,231,219,.05); }
.guide-toc a.on { color: var(--cinnabar-soft); }
.guide-body { max-width: 760px; }
.guide-body h2 {
  font-size: 25px; margin: 54px 0 16px; padding-top: 10px;
  scroll-margin-top: calc(var(--nav-h) + 20px);
}
.guide-body h2:first-child { margin-top: 0; }
.guide-body h2 .g-no { color: var(--cinnabar); margin-right: 10px; font-size: .8em; }
.guide-body p { color: var(--ink-dim); margin-bottom: 14px; }
.guide-body ul, .guide-body ol { color: var(--ink-dim); padding-left: 22px; margin-bottom: 14px; }
.guide-body li { margin-bottom: 6px; }
.guide-body b { color: var(--ink); font-weight: 600; }
.guide-body .code-block { margin: 18px 0 22px; }
.guide-body hr { border: none; border-top: 1px solid var(--line-soft); margin: 40px 0; }

/* ---------- 动效 ---------- */
.reveal {
  opacity: 0; transform: translateY(22px);
  transition: opacity .7s var(--ease), transform .7s var(--ease);
  transition-delay: var(--d, 0s);
}
.reveal.in { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .ink-line i { transform: scaleX(1); animation: none !important; }
  .ink-line.snapped i::after { transform: translateY(-50%) scale(1); }
  .mc-ai .cursor { animation: none; }
  .stat-cell .num { font-variant-numeric: tabular-nums; }
}

/* ---------- 响应式 ---------- */
@media (max-width: 1060px) {
  .hero-inner { grid-template-columns: 1fr; gap: 40px; }
  .value-grid { grid-template-columns: 1fr 1fr; }
  .bento { grid-template-columns: 1fr 1fr; }
  .b-card.wide { grid-column: span 2; }
  .arch-wrap { grid-template-columns: 1fr; }
  .evidence-grid { grid-template-columns: 1fr; }
  .friends-main { grid-template-columns: 1fr 1fr; }
  .footer-inner { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 820px) {
  .nav-links, .nav .nav-cta { display: none; }
  .nav-toggle { display: block; }
  .nav-drawer { display: none; }
  .nav-drawer.open { display: flex; }
  .hero { padding-top: calc(var(--nav-h) + 40px); }
  .hero-stats { grid-template-columns: 1fr 1fr; }
  .platform-grid { grid-template-columns: 1fr; }
  .dl-grid { grid-template-columns: 1fr; }
  .start-banner { flex-direction: column; align-items: flex-start; padding: 34px 28px; }
  .guide-layout { grid-template-columns: 1fr; }
  .guide-toc { position: static; flex-direction: row; flex-wrap: wrap; border-left: none; padding-left: 0; border-bottom: 1px solid var(--line-soft); padding-bottom: 12px; }
}

@media (max-width: 560px) {
  .container, .hero-inner, .nav-inner { padding-left: 20px; padding-right: 20px; }
  .value-grid, .bento, .friends-main, .footer-inner { grid-template-columns: 1fr; }
  .b-card.wide { grid-column: span 1; }
  .hero-stats { grid-template-columns: 1fr 1fr; }
  .stat-cell { padding: 16px 18px; }
  .mock-body { grid-template-columns: 1fr; }
  .mock-side { display: none; }
  .hero-actions .btn { flex: 1; justify-content: center; }
  .friend-logo { width: 112px; height: 38px; }
}

/* ---------- v2：设备互联 / 数据安全 / 体积徽标 ---------- */
.mock-devbar {
  display: flex; align-items: center; gap: 10px;
  padding: 8px 14px; border-bottom: 1px solid var(--line-soft); background: var(--bg2);
  font-family: var(--font-mono); font-size: 11.5px; color: var(--ink-dim);
}
.mock-devbar .dev-chip {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 2px 10px; border-radius: 999px;
  border: 1px solid rgba(212,85,58,.45); background: rgba(212,85,58,.08);
  color: var(--cinnabar-soft);
}
.mock-devbar .dev-mode { margin-left: auto; color: var(--green); }
.mock-devbar .dev-relay { color: var(--ink-faint); }

.steps { list-style: none; display: flex; flex-direction: column; gap: 12px; margin: 0; }
.steps li {
  display: flex; gap: 14px; padding: 15px 18px;
  border: 1px solid var(--line-soft); border-radius: var(--radius); background: var(--bg2);
}
.steps .s-no {
  flex-shrink: 0; width: 30px; height: 30px; border-radius: 8px;
  background: rgba(212,85,58,.14); border: 1px solid rgba(212,85,58,.4);
  color: var(--cinnabar-soft); font-family: var(--font-mono); font-size: 13px;
  display: flex; align-items: center; justify-content: center;
}
.steps b { color: var(--ink); font-weight: 600; }
.steps p { margin: 3px 0 0; font-size: 13.5px; color: var(--ink-dim); }

.sec-list { list-style: none; display: flex; flex-direction: column; gap: 11px; }
.sec-list li { position: relative; padding-left: 24px; color: var(--ink-dim); font-size: 14.5px; }
.sec-list li::before {
  content: "✓"; position: absolute; left: 0; top: 0;
  color: var(--green); font-weight: 700;
}
.sec-list b { color: var(--ink); font-weight: 600; }

.p-chip {
  margin-left: auto; font-family: var(--font-mono); font-size: 10.5px;
  color: var(--gold); border: 1px solid rgba(201,168,106,.4);
  padding: 2px 8px; border-radius: 999px; white-space: nowrap;
}
.remote-note { margin-top: 20px; text-align: center; color: var(--ink-faint); font-size: 13px; }

/* ---------- v3：下载页通栏完整版卡 ---------- */
.dl-card-wide { grid-column: 1 / -1; }
.dl-card-wide .a-mods { row-gap: 8px; }

/* Direct Linux downloads: the libc choice stays visible without JavaScript. */
.dl-variants { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
.dl-variant { display: flex; flex-direction: column; gap: 12px; padding: 20px; min-width: 0; border: 1px solid var(--line-soft); border-radius: var(--radius); }
.dl-variant h3 { font-family: var(--font-mono); font-size: 18px; }
.dl-variant p, .dl-run { color: var(--ink-dim); font-size: 13px; }
.dl-variant .btn { width: 100%; }
.dl-run code { overflow-wrap: anywhere; }
@media (max-width: 560px) {
  .dl-variants { grid-template-columns: 1fr; }
  .dl-head { flex-wrap: wrap; }
  .dl-card .btn { overflow-wrap: anywhere; }
}