/* 智选 · 官网样式（深色科技风）
 * 只服务 web/index.html；App 端在 css/ask.css，经典端在 css/app.css。
 */

:root {
  --bg: #04060D;
  --bg-2: #070C18;
  --panel: rgba(140, 190, 255, .045);
  --panel-2: rgba(140, 190, 255, .075);
  --ink: #E9EFF8;
  --muted: #9AA8BD;
  --faint: #6B7A92;
  --line: rgba(140, 190, 255, .16);
  --line-2: rgba(140, 190, 255, .08);
  --cyan: #6FE7FF;
  --cyan-hi: #A9F4FF;
  --blue: #2E7BFF;
  --deep: #08235F;
  --glow: rgba(46, 123, 255, .38);
  --acc-grad: linear-gradient(118deg, var(--cyan-hi), var(--cyan) 42%, var(--blue));
  --radius: 16px;
  --wrap: 1160px;
  --ease: cubic-bezier(.22, .61, .36, 1);
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei", -apple-system, "Segoe UI", Roboto, sans-serif;
  font-size: 15px;
  line-height: 1.8;
  letter-spacing: .01em;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* 背景层：极淡网格 + 顶部两道冷光 */
body::before,
body::after {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
}
body::before {
  background-image:
    linear-gradient(rgba(140, 190, 255, .038) 1px, transparent 1px),
    linear-gradient(90deg, rgba(140, 190, 255, .038) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(120% 80% at 50% 0%, #000 12%, transparent 72%);
  -webkit-mask-image: radial-gradient(120% 80% at 50% 0%, #000 12%, transparent 72%);
}
body::after {
  background:
    radial-gradient(52% 34% at 18% -6%, rgba(46, 123, 255, .26), transparent 70%),
    radial-gradient(46% 30% at 84% 2%, rgba(111, 231, 255, .16), transparent 72%),
    radial-gradient(70% 40% at 50% 108%, rgba(8, 35, 95, .5), transparent 70%);
}

main, .nav, .foot { position: relative; z-index: 1; }

a { color: inherit; text-decoration: none; }
h1, h2, h3, h4, p, dl, ul, ol, figure { margin: 0; }
ul, ol { list-style: none; padding: 0; }

::selection { background: rgba(46, 123, 255, .45); color: #F2FAFF; }

:focus-visible {
  outline: 1px solid var(--cyan);
  outline-offset: 3px;
  border-radius: 6px;
}

.wrap { width: 100%; max-width: var(--wrap); margin: 0 auto; padding: 0 26px; }
.wrap--narrow { max-width: 880px; }
.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}

/* ── 文案元素 ───────────────────────────────── */
.eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 11px; letter-spacing: .22em; text-transform: uppercase;
  color: var(--cyan);
}
.eyebrow--mono { font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace; letter-spacing: .16em; }

.mark {
  background: var(--acc-grad);
  -webkit-background-clip: text; background-clip: text;
  color: transparent;
}

.lede { margin-top: 22px; max-width: 620px; font-size: 16.5px; line-height: 1.95; color: var(--muted); }
.lede strong { color: var(--ink); font-weight: 600; }

.note {
  margin-top: 34px; padding: 14px 18px; border: 1px solid var(--line-2);
  border-left: 2px solid var(--cyan);
  border-radius: 0 var(--radius) var(--radius) 0;
  background: var(--panel);
  font-size: 13px; color: var(--muted);
}

/* ── 按钮 ───────────────────────────────────── */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  height: 42px; padding: 0 20px; border-radius: 999px;
  font-size: 14px; font-weight: 600; letter-spacing: .02em;
  border: 1px solid transparent;
  transition: transform .22s var(--ease), box-shadow .22s var(--ease), border-color .22s, background .22s;
  cursor: pointer;
}
.btn--pri {
  background: var(--acc-grad);
  color: #021024;
  box-shadow: 0 10px 34px -14px var(--glow), inset 0 1px 0 rgba(255, 255, 255, .4);
}
.btn--pri:hover { transform: translateY(-2px); box-shadow: 0 16px 44px -14px rgba(76, 200, 255, .55), inset 0 1px 0 rgba(255, 255, 255, .5); }
.btn--ghost { border-color: var(--line); color: var(--ink); background: rgba(140, 190, 255, .04); }
.btn--ghost:hover { border-color: rgba(111, 231, 255, .5); background: rgba(140, 190, 255, .09); transform: translateY(-2px); }
.btn--light { background: #EAF6FF; color: #05162E; }
.btn--light:hover { transform: translateY(-2px); box-shadow: 0 14px 40px -16px rgba(200, 235, 255, .5); }
.btn--lg { height: 50px; padding: 0 26px; font-size: 15px; }

/* ── 顶栏 ───────────────────────────────────── */
.nav {
  position: sticky; top: 0; z-index: 40;
  background: rgba(4, 6, 13, .68);
  backdrop-filter: blur(16px) saturate(140%);
  -webkit-backdrop-filter: blur(16px) saturate(140%);
  border-bottom: 1px solid var(--line-2);
}
.nav__in { display: flex; align-items: center; gap: 26px; height: 66px; }
.brand { display: inline-flex; align-items: center; gap: 10px; }
.brand__mark { width: 30px; height: 30px; filter: drop-shadow(0 3px 12px rgba(46, 123, 255, .5)); }
.brand__t { display: flex; flex-direction: column; line-height: 1.05; font-size: 18px; font-weight: 700; letter-spacing: .06em; }
.brand__t i {
  font-style: normal; font-size: 8px; letter-spacing: .26em;
  color: var(--faint); font-family: ui-monospace, Menlo, Consolas, monospace;
}
.nav__links { display: flex; gap: 26px; margin-left: auto; font-size: 13.5px; color: var(--muted); }
.nav__links a { position: relative; padding: 4px 0; transition: color .2s; }
.nav__links a::after {
  content: ""; position: absolute; left: 0; right: 100%; bottom: 0;
  height: 1px; background: var(--cyan); transition: right .28s var(--ease);
}
.nav__links a:hover { color: var(--ink); }
.nav__links a:hover::after { right: 0; }
.nav__cta { flex: none; }

/* ── 首屏 ───────────────────────────────────── */
.hero { position: relative; padding: 96px 0 92px; overflow: hidden; }
.hero__glow {
  position: absolute; left: 50%; top: -18%; width: 1180px; height: 620px;
  transform: translateX(-50%);
  background: radial-gradient(50% 50% at 50% 50%, rgba(46, 123, 255, .22), transparent 68%);
  pointer-events: none;
}
.hero__in { position: relative; text-align: center; display: flex; flex-direction: column; align-items: center; }

h1 {
  margin-top: 22px;
  font-size: clamp(40px, 7.4vw, 78px);
  line-height: 1.08;
  font-weight: 700;
  letter-spacing: -.015em;
  text-shadow: 0 0 60px rgba(46, 123, 255, .22);
}
.hero .lede { text-align: left; }
.hero__cta { display: flex; flex-wrap: wrap; gap: 14px; justify-content: center; margin-top: 34px; }
.hero__fine { margin-top: 20px; font-size: 12px; letter-spacing: .06em; color: var(--faint); }

/* ── 品牌立方体 ─────────────────────────────── */
.cube {
  position: relative; width: 210px; height: 210px;
  display: grid; place-items: center;
  margin-bottom: 30px;
  perspective: 760px;
}
.cube__box {
  position: relative; width: 118px; height: 118px;
  transform-style: preserve-3d;
  animation: tumble 22s linear infinite;
}
.cube__f {
  position: absolute; inset: 0;
  border: 1px solid rgba(169, 244, 255, .5);
  background: linear-gradient(150deg, rgba(46, 123, 255, .3), rgba(8, 35, 95, .58));
  box-shadow: inset 0 0 26px rgba(111, 231, 255, .28);
  overflow: hidden;
}
.cube__f--front  { transform: translateZ(59px); }
.cube__f--back   { transform: rotateY(180deg) translateZ(59px); }
.cube__f--right  { transform: rotateY(90deg) translateZ(59px); }
.cube__f--left   { transform: rotateY(-90deg) translateZ(59px); }
.cube__f--top    { transform: rotateX(90deg) translateZ(59px); background: linear-gradient(150deg, rgba(169, 244, 255, .42), rgba(46, 123, 255, .3)); }
.cube__f--bottom { transform: rotateX(-90deg) translateZ(59px); }
.cube__scan {
  position: absolute; left: 0; right: 0; height: 42%;
  background: linear-gradient(180deg, transparent, rgba(169, 244, 255, .5), transparent);
  animation: scan 4.6s ease-in-out infinite;
}
.cube__core { position: absolute; inset: 30px; transform-style: preserve-3d; animation: tumble 14s linear infinite reverse; }
.cube__cf { position: absolute; inset: 0; border: 1px solid rgba(169, 244, 255, .8); background: rgba(111, 231, 255, .12); }
.cube__cf--front  { transform: translateZ(29px); }
.cube__cf--back   { transform: rotateY(180deg) translateZ(29px); }
.cube__cf--right  { transform: rotateY(90deg) translateZ(29px); }
.cube__cf--left   { transform: rotateY(-90deg) translateZ(29px); }
.cube__cf--top    { transform: rotateX(90deg) translateZ(29px); }
.cube__cf--bottom { transform: rotateX(-90deg) translateZ(29px); }
.cube__aura {
  position: absolute; width: 190px; height: 190px; border-radius: 50%;
  background: radial-gradient(50% 50% at 50% 50%, rgba(111, 231, 255, .3), transparent 66%);
  filter: blur(6px);
  animation: breathe 5.4s ease-in-out infinite;
}
.cube__ring {
  position: absolute; width: 208px; height: 208px; border-radius: 50%;
  border: 1px solid rgba(111, 231, 255, .26);
  transform: rotateX(76deg);
  animation: ring 16s linear infinite;
}

@keyframes tumble {
  from { transform: rotateX(-24deg) rotateY(0deg); }
  to   { transform: rotateX(-24deg) rotateY(360deg); }
}
@keyframes scan {
  0%, 100% { top: -42%; opacity: 0; }
  20% { opacity: .9; }
  80% { opacity: .9; }
  100% { top: 100%; }
}
@keyframes breathe {
  0%, 100% { opacity: .55; transform: scale(1); }
  50% { opacity: 1; transform: scale(1.07); }
}
@keyframes ring {
  from { transform: rotateX(76deg) rotateZ(0deg); }
  to   { transform: rotateX(76deg) rotateZ(360deg); }
}

/* ── 关键事实 ───────────────────────────────── */
.facts { position: relative; padding: 0 0 8px; }
.facts__grid {
  display: grid; grid-template-columns: repeat(3, 1fr);
  border-top: 1px solid var(--line-2);
  border-left: 1px solid var(--line-2);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--panel);
}
.fact { padding: 20px 22px; border-right: 1px solid var(--line-2); border-bottom: 1px solid var(--line-2); }
.fact dt {
  font-size: 10px; letter-spacing: .2em; text-transform: uppercase; color: var(--cyan);
  font-family: ui-monospace, Menlo, Consolas, monospace;
}
.fact dd { margin: 8px 0 0; font-size: 14.5px; color: var(--ink); font-variant-numeric: tabular-nums; }

/* ── 通用区块 ───────────────────────────────── */
.sec { padding: 100px 0; }
.sec--panel {
  background:
    linear-gradient(180deg, rgba(140, 190, 255, .05), rgba(140, 190, 255, .015)),
    var(--bg-2);
  border-top: 1px solid var(--line-2);
  border-bottom: 1px solid var(--line-2);
}
.sec__h { max-width: 720px; margin: 0 auto 54px; text-align: center; }
.sec__h--left { margin-left: 0; text-align: left; }
.sec__h h2 {
  margin-top: 16px;
  font-size: clamp(28px, 4.2vw, 44px);
  line-height: 1.28; font-weight: 700; letter-spacing: -.01em;
}
.sec__h p { margin-top: 16px; color: var(--muted); font-size: 15px; }

/* ── 三卡 ───────────────────────────────────── */
.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.card, .bound {
  position: relative; padding: 26px 24px 24px;
  border: 1px solid var(--line-2); border-radius: var(--radius);
  background: var(--panel);
  transition: transform .28s var(--ease), border-color .28s, box-shadow .28s;
}
.card::before {
  content: ""; position: absolute; left: 24px; right: 24px; top: -1px; height: 1px;
  background: linear-gradient(90deg, transparent, rgba(111, 231, 255, .55), transparent);
  opacity: 0; transition: opacity .28s;
}
.card:hover, .bound:hover { transform: translateY(-4px); border-color: var(--line); box-shadow: 0 22px 50px -30px rgba(8, 30, 70, .9); }
.card:hover::before { opacity: 1; }
.card__n {
  font-family: ui-monospace, Menlo, Consolas, monospace;
  font-size: 12px; letter-spacing: .18em; color: var(--cyan);
}
.card h3, .bound h3 { margin-top: 10px; font-size: 19px; font-weight: 700; letter-spacing: .01em; }
.card p, .bound p { margin-top: 12px; font-size: 13.5px; line-height: 1.85; color: var(--muted); }
.card--none { background: rgba(140, 190, 255, .025); }

.qa { margin-top: 20px; display: flex; flex-direction: column; gap: 8px; }
.qa__q, .qa__a {
  padding: 11px 14px; border-radius: 10px; font-size: 13.5px; line-height: 1.6;
}
.qa__q { background: rgba(140, 190, 255, .07); color: var(--muted); }
.qa__a {
  align-self: flex-end; background: var(--acc-grad); color: #021024;
  font-weight: 700; letter-spacing: .04em; box-shadow: 0 8px 24px -14px var(--glow);
}
.qa--none .qa__a { background: rgba(140, 190, 255, .14); color: var(--muted); box-shadow: none; font-weight: 600; }

.chips { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 20px; }
.chips li {
  padding: 7px 12px; border-radius: 999px; border: 1px solid var(--line);
  background: rgba(111, 231, 255, .06);
  font-size: 12px; color: var(--ink); font-variant-numeric: tabular-nums; letter-spacing: .02em;
}

/* ── 流程 ───────────────────────────────────── */
.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; counter-reset: s; }
.step {
  position: relative; padding: 24px 22px;
  border: 1px solid var(--line-2); border-radius: var(--radius);
  background: var(--panel);
}
.step b {
  display: block; font-family: ui-monospace, Menlo, Consolas, monospace;
  font-size: 26px; letter-spacing: -.02em; color: var(--cyan);
  text-shadow: 0 0 24px rgba(111, 231, 255, .4);
}
.step h4 { margin-top: 12px; font-size: 16px; font-weight: 700; }
.step p { margin-top: 10px; font-size: 13px; line-height: 1.85; color: var(--muted); }
.step::after {
  content: ""; position: absolute; right: -10px; top: 44px; width: 10px; height: 1px;
  background: linear-gradient(90deg, var(--line), transparent);
}
.step:last-child::after { display: none; }

/* ── 内容安全 ───────────────────────────────── */
.folk { display: grid; grid-template-columns: 1.05fr .95fr; gap: 54px; align-items: center; }
.folk__copy h2 {
  margin-top: 16px; font-size: clamp(28px, 4.2vw, 42px);
  line-height: 1.3; font-weight: 700; letter-spacing: -.01em;
}
.folk__copy > p { margin-top: 18px; color: var(--muted); font-size: 14.5px; }
.folk__copy strong { color: var(--ink); font-weight: 600; }
.folk__list { margin-top: 22px; display: flex; flex-direction: column; gap: 12px; }
.folk__list li {
  position: relative; padding-left: 20px; font-size: 13.5px; line-height: 1.75; color: var(--muted);
}
.folk__list li::before {
  content: ""; position: absolute; left: 0; top: 9px; width: 8px; height: 8px;
  border-radius: 2px; background: var(--acc-grad); transform: rotate(45deg);
}
.folk__warn {
  margin-top: 24px; padding: 13px 16px; border-radius: 12px;
  border: 1px solid rgba(111, 231, 255, .22);
  background: rgba(46, 123, 255, .1);
  font-size: 13px; color: var(--ink);
}

.panel {
  border: 1px solid var(--line); border-radius: 18px; overflow: hidden;
  background: linear-gradient(180deg, rgba(140, 190, 255, .09), rgba(4, 6, 13, .5));
  box-shadow: 0 40px 90px -50px rgba(6, 24, 60, 1), inset 0 1px 0 rgba(169, 244, 255, .22);
}
.panel__bar {
  display: flex; align-items: center; gap: 8px; padding: 12px 16px;
  border-bottom: 1px solid var(--line-2);
  font-family: ui-monospace, Menlo, Consolas, monospace;
  font-size: 10.5px; letter-spacing: .16em; color: var(--faint); text-transform: uppercase;
}
.dot { width: 7px; height: 7px; border-radius: 50%; background: var(--faint); }
.dot--on { background: #57F2B3; box-shadow: 0 0 12px rgba(87, 242, 179, .8); }
.panel__id { margin-left: auto; color: var(--cyan); }
.panel__q { padding: 18px 18px 0; font-size: 14.5px; color: var(--muted); }
.panel__a {
  padding: 10px 18px 18px; font-size: 30px; font-weight: 700; letter-spacing: .02em;
  background: var(--acc-grad); -webkit-background-clip: text; background-clip: text; color: transparent;
}
.trace { border-top: 1px solid var(--line-2); }
.trace__row {
  display: grid; grid-template-columns: 1fr auto auto; align-items: center; gap: 14px;
  padding: 11px 18px; border-bottom: 1px solid var(--line-2);
  font-size: 12.5px;
}
.trace__row span { color: var(--muted); }
.trace__row b { color: #57F2B3; font-weight: 600; font-variant-numeric: tabular-nums; }
.trace__row em {
  font-style: normal; color: var(--faint);
  font-family: ui-monospace, Menlo, Consolas, monospace; font-size: 11px;
}
.panel__foot {
  display: flex; align-items: center; gap: 10px; padding: 14px 18px;
  font-size: 11.5px; color: var(--faint);
}
.tag {
  padding: 4px 10px; border-radius: 999px; font-size: 11px; letter-spacing: .06em;
  border: 1px solid var(--line); color: var(--ink);
}
.tag--ai { background: rgba(111, 231, 255, .12); border-color: rgba(111, 231, 255, .4); color: var(--cyan-hi); }
.panel__foot span:last-child { margin-left: auto; color: var(--muted); }

/* ── FAQ ────────────────────────────────────── */
.qa-list { display: flex; flex-direction: column; gap: 10px; }
.qa-item {
  border: 1px solid var(--line-2); border-radius: 14px; background: var(--panel);
  transition: border-color .24s, background .24s;
}
.qa-item:hover { border-color: var(--line); background: var(--panel-2); }
.qa-item dt { padding: 17px 20px 0; font-size: 16px; font-weight: 600; letter-spacing: .01em; }
.qa-item dd { margin: 0; padding: 8px 20px 18px; font-size: 14px; line-height: 1.9; color: var(--muted); }
.qa-item dd a { color: var(--cyan); border-bottom: 1px solid rgba(111, 231, 255, .35); }

/* ── 更新记录 ───────────────────────────────── */
.log { margin-top: 8px; border-left: 1px solid var(--line); padding-left: 0; }
.log li { position: relative; padding: 0 0 30px 26px; }
.log li::before {
  content: ""; position: absolute; left: -4.5px; top: 9px; width: 8px; height: 8px;
  border-radius: 50%; background: var(--cyan); box-shadow: 0 0 0 4px rgba(111, 231, 255, .14);
}
.log li:last-child { padding-bottom: 0; }
.log time {
  display: flex; align-items: baseline; gap: 10px;
  font-family: ui-monospace, Menlo, Consolas, monospace;
  font-size: 11.5px; letter-spacing: .1em; color: var(--faint);
}
.log time b { font-size: 15px; color: var(--ink); letter-spacing: .02em; font-weight: 700; }
.log li p { margin-top: 8px; font-size: 13.5px; line-height: 1.9; color: var(--muted); max-width: 640px; }

/* ── 收尾横幅 ───────────────────────────────── */
.band {
  position: relative; overflow: hidden;
  background:
    radial-gradient(60% 120% at 20% 0%, rgba(46, 123, 255, .5), transparent 60%),
    radial-gradient(50% 120% at 90% 100%, rgba(111, 231, 255, .3), transparent 62%),
    #050A16;
  border-top: 1px solid var(--line-2);
  padding: 92px 0;
}
.band__in { display: flex; align-items: center; justify-content: space-between; gap: 44px; }
.band h2 {
  margin-top: 16px; font-size: clamp(26px, 3.8vw, 40px);
  line-height: 1.3; font-weight: 700; letter-spacing: -.01em;
}
.band p { margin-top: 14px; color: var(--muted); font-size: 14.5px; max-width: 420px; }
.band__cta { display: flex; flex-wrap: wrap; gap: 14px; }

/* ── 下载（官网只做展示与分发，不在电脑浏览器里跑 App）── */
.dl__grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
.dl__grid--single { grid-template-columns: 1fr; }
.dlcard {
  display: flex; gap: 26px; align-items: flex-start;
  padding: 28px 28px 24px;
  border: 1px solid var(--line); border-radius: var(--radius);
  background: linear-gradient(165deg, rgba(111, 231, 255, .075), rgba(140, 190, 255, .03) 46%, rgba(140, 190, 255, .02));
  box-shadow: 0 30px 70px -50px rgba(8, 30, 70, .95);
}
.dlcard__body { min-width: 0; flex: 1; }
.dlcard h3 { margin-top: 10px; font-size: 20px; font-weight: 700; }
.dlcard > .dlcard__body > p { margin-top: 10px; font-size: 13.5px; line-height: 1.85; color: var(--muted); }
.dlcard__k { font-family: ui-monospace, Menlo, Consolas, monospace; font-size: 11.5px; letter-spacing: .16em; color: var(--cyan); }
.qr { flex: none; width: 156px; text-align: center; }
.qr img {
  display: block; width: 156px; height: 156px;
  background: #F3F8FF; border-radius: 14px; padding: 9px;
  border: 1px solid var(--line);
}
.qr span { display: block; margin-top: 9px; font-size: 11px; line-height: 1.6; color: var(--faint); }
.dl__meta { margin-top: 16px; display: grid; gap: 7px; font-size: 12px; }
.dl__meta div { display: flex; justify-content: space-between; gap: 12px; padding: 7px 11px; border-radius: 9px; background: rgba(4, 8, 18, .5); border: 1px solid var(--line-2); }
.dl__meta dt, .dl__meta b { color: var(--faint); font-weight: 600; flex: none; }
.dl__meta em { font-style: normal; color: var(--ink); font-family: ui-monospace, Menlo, Consolas, monospace; font-size: 11px; letter-spacing: -.01em; }
.dl__acts { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 18px; }
.dl__note {
  margin-top: 20px; padding: 15px 18px; border-radius: 12px;
  border: 1px solid rgba(242, 193, 78, .28); background: rgba(242, 193, 78, .07);
  font-size: 12.5px; line-height: 1.85; color: #E8D9AE;
}
.dl__steps { margin-top: 14px; padding-left: 20px; font-size: 12.5px; line-height: 1.9; color: var(--muted); }
.dl__steps li { margin-top: 4px; }

/* ── 页脚 ───────────────────────────────────── */
.foot { border-top: 1px solid var(--line-2); background: #03050B; padding: 46px 0 54px; }
.foot__in { display: flex; justify-content: space-between; gap: 50px; }
.foot__brand { max-width: 620px; }
.brand--foot .brand__mark { width: 26px; height: 26px; }
.brand--foot .brand__t { font-size: 16px; }
.foot__disc { margin-top: 16px; font-size: 11.5px; line-height: 1.95; color: var(--faint); }
.foot__meta { display: flex; flex-direction: column; align-items: flex-end; gap: 9px; flex: none; font-size: 12.5px; color: var(--muted); }
.foot__meta a:hover { color: var(--cyan); }
.foot__meta span { margin-top: 8px; font-size: 10.5px; color: var(--faint); font-variant-numeric: tabular-nums; }
.foot__meta .foot__beian { margin-top: 0; font-size: 10.5px; color: var(--faint); }

/* ── 响应式 ─────────────────────────────────── */
@media (max-width: 1000px) {
  .cards, .steps { grid-template-columns: repeat(2, 1fr); }
  .step::after { display: none; }
  .folk { grid-template-columns: 1fr; gap: 34px; }
  .facts__grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 720px) {
  .nav__links { display: none; }
  .nav__in { gap: 12px; }
  .nav__cta { margin-left: auto; height: 38px; padding: 0 16px; font-size: 13px; }
  .hero { padding: 64px 0 70px; }
  .cube { width: 168px; height: 168px; margin-bottom: 22px; }
  .cube__box { width: 94px; height: 94px; }
  .cube__f--front, .cube__f--back, .cube__f--right, .cube__f--left, .cube__f--top, .cube__f--bottom { transform: none; }
  .cube__f--front  { transform: translateZ(47px); }
  .cube__f--back   { transform: rotateY(180deg) translateZ(47px); }
  .cube__f--right  { transform: rotateY(90deg) translateZ(47px); }
  .cube__f--left   { transform: rotateY(-90deg) translateZ(47px); }
  .cube__f--top    { transform: rotateX(90deg) translateZ(47px); }
  .cube__f--bottom { transform: rotateX(-90deg) translateZ(47px); }
  .cube__core { inset: 24px; }
  .cube__cf--front, .cube__cf--back, .cube__cf--right, .cube__cf--left, .cube__cf--top, .cube__cf--bottom { transform: none; }
  .cube__cf--front  { transform: translateZ(23px); }
  .cube__cf--back   { transform: rotateY(180deg) translateZ(23px); }
  .cube__cf--right  { transform: rotateY(90deg) translateZ(23px); }
  .cube__cf--left   { transform: rotateY(-90deg) translateZ(23px); }
  .cube__cf--top    { transform: rotateX(90deg) translateZ(23px); }
  .cube__cf--bottom { transform: rotateX(-90deg) translateZ(23px); }
  .cube__aura { width: 152px; height: 152px; }
  .cube__ring { width: 166px; height: 166px; }
  .sec { padding: 72px 0; }
  .cards, .steps, .facts__grid { grid-template-columns: 1fr; }
  .hero__cta { flex-direction: column; width: 100%; max-width: 320px; }
  .btn--lg { width: 100%; }
  .band { padding: 62px 0; }
  .band__in { flex-direction: column; align-items: flex-start; }
  .foot__in { flex-direction: column; gap: 26px; }
  .foot__meta { align-items: flex-start; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .cube__box, .cube__core, .cube__scan, .cube__aura, .cube__ring { animation: none; }
  .btn, .card, .bound, .qa-item { transition: none; }
}