/* 幻境智能官网样式表
   1. 设计变量  2. 基础排版  3. 通用组件  4. 页头页脚  5. 首页  6. 内页  7. 响应式 */

/* ---------- 1. 设计变量 ---------- */
:root {
  --brand: #1358e0;
  --brand-strong: #0b3fae;
  --brand-light: #4b8bff;
  --brand-tint: #ecf3ff;
  --navy: #061229;
  --ink: #0c1424;
  --text: #46536a;
  --muted: #778296;
  --line: #e4e9f1;
  --line-soft: #eef1f7;
  --soft: #f6f8fc;
  --white: #fff;

  --content: 1200px;
  --gutter: 24px;
  --radius-sm: 10px;
  --radius: 14px;
  --radius-lg: 18px;

  --mono: ui-monospace, "SFMono-Regular", Menlo, Consolas, "PingFang SC", "Microsoft YaHei", monospace;

  --shadow-sm: 0 2px 6px rgba(9, 30, 77, .04), 0 12px 28px -18px rgba(9, 30, 77, .22);
  --shadow-md: 0 4px 12px rgba(9, 30, 77, .06), 0 24px 48px -24px rgba(9, 30, 77, .28);
  --shadow-lg: 0 12px 32px -16px rgba(9, 30, 77, .2), 0 44px 84px -36px rgba(9, 30, 77, .42);

  --ease: cubic-bezier(.2, .7, .3, 1);
}

/* ---------- 2. 基础排版 ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: 92px;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--white);
  font-family: "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei", "Noto Sans SC", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 17px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body.nav-open { overflow: hidden; }

h1, h2, h3, h4 {
  margin: 0;
  color: var(--ink);
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: -.02em;
}

p { margin: 0; color: var(--text); }
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; height: auto; }
ul, ol, dl, dd { margin: 0; padding: 0; }
li { list-style: none; }
button { font: inherit; color: inherit; }
em { font-style: normal; }

.mono { font-family: var(--mono); letter-spacing: .01em; }

::selection { background: rgba(19, 88, 224, .16); }

:focus-visible {
  outline: 2px solid var(--brand);
  outline-offset: 3px;
  border-radius: 4px;
}

.skip-link {
  position: fixed;
  top: -60px;
  left: 16px;
  z-index: 200;
  padding: 10px 18px;
  border-radius: 0 0 var(--radius-sm) var(--radius-sm);
  color: var(--white);
  background: var(--brand);
  font-size: 15px;
  transition: top .2s var(--ease);
}
.skip-link:focus { top: 0; }

.container {
  width: 100%;
  max-width: calc(var(--content) + var(--gutter) * 2);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.icon-sprite { display: none; }

.ico {
  width: 21px;
  height: 21px;
  flex: none;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.6;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.ico-sm { width: 17px; height: 17px; stroke-width: 1.8; }

/* ---------- 3. 通用组件 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  height: 50px;
  padding: 0 24px;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  font-size: 16px;
  font-weight: 600;
  white-space: nowrap;
  cursor: pointer;
  transition: transform .2s var(--ease), box-shadow .2s var(--ease), background .2s var(--ease), border-color .2s var(--ease), color .2s var(--ease);
}
.btn-sm { height: 40px; padding: 0 17px; font-size: 15px; border-radius: 9px; }

.btn-primary {
  color: var(--white);
  background: linear-gradient(180deg, #2c70f2, var(--brand));
  box-shadow: 0 10px 22px -12px rgba(19, 88, 224, .85);
}
.btn-primary:hover {
  background: linear-gradient(180deg, #1f63e8, var(--brand-strong));
  box-shadow: 0 16px 30px -14px rgba(19, 88, 224, .9);
  transform: translateY(-1px);
}

.btn-ghost {
  color: var(--ink);
  background: rgba(255, 255, 255, .75);
  border-color: var(--line);
  backdrop-filter: blur(8px);
}
.btn-ghost:hover {
  color: var(--brand);
  border-color: rgba(19, 88, 224, .4);
  background: var(--white);
  transform: translateY(-1px);
}
.btn-ghost--dark { background: var(--white); }

.btn-light {
  color: #0b1a35;
  background: var(--white);
  box-shadow: 0 12px 26px -16px rgba(0, 0, 0, .8);
}
.btn-light:hover { transform: translateY(-1px); background: #eef4ff; }

.kicker {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  margin-bottom: 14px;
  color: var(--brand);
  font-size: 13.5px;
  font-weight: 700;
  letter-spacing: .1em;
}
.kicker--light { color: #86b2ff; }
.kicker-num {
  padding: 2px 8px;
  border-radius: 6px;
  color: var(--brand-strong);
  background: var(--brand-tint);
  font-family: var(--mono);
  font-size: 12.5px;
  letter-spacing: .06em;
}

.section-head { max-width: 760px; margin-bottom: 44px; }
.section-head h2 { font-size: clamp(30px, 3.4vw, 42px); }
.section-lead {
  margin-top: 16px;
  font-size: 19px;
  line-height: 1.85;
}

.band { padding: clamp(60px, 6.5vw, 96px) 0; }
.band-soft {
  background: var(--soft);
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
}

.shot {
  position: relative;
  margin: 0;
  overflow: hidden;
  border: 1px solid rgba(12, 20, 36, .08);
  border-radius: var(--radius-lg);
  background: var(--white);
  box-shadow: var(--shadow-md);
}
.shot-hero { box-shadow: var(--shadow-lg); }
.shot-bar {
  display: flex;
  align-items: center;
  gap: 7px;
  height: 34px;
  padding: 0 15px;
  background: linear-gradient(180deg, #fbfcfe, #f3f6fb);
  border-bottom: 1px solid var(--line-soft);
}
.shot-bar i { width: 9px; height: 9px; border-radius: 50%; background: #d9e0ea; }
.shot img { width: 100%; }

.text-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--brand);
  font-size: 16px;
  font-weight: 600;
}
.text-link .ico { transition: transform .2s var(--ease); }
.text-link:hover .ico { transform: translateX(3px); }

.chip {
  display: inline-flex;
  align-items: center;
  padding: 4px 13px;
  border-radius: 999px;
  color: var(--brand-strong);
  background: var(--brand-tint);
  font-size: 14px;
  font-weight: 600;
}

.facts > div {
  padding: 14px 0;
  border-top: 1px solid var(--line);
}
.facts > div:first-child { border-top: 0; padding-top: 0; }
.facts dt {
  color: var(--muted);
  font-size: 14px;
  letter-spacing: .02em;
}
.facts dd {
  margin-top: 3px;
  color: var(--ink);
  font-size: 16.5px;
  line-height: 1.6;
}
.facts dd a { color: var(--brand); }
.facts dd a:hover { text-decoration: underline; }
.facts--tight > div { padding: 10px 0; }
.facts--tight dd { font-size: 15.5px; }

.split {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
  gap: clamp(32px, 4vw, 56px);
  align-items: start;
}

[data-reveal] {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity .65s var(--ease), transform .65s var(--ease);
  transition-delay: var(--delay, 0ms);
}
[data-reveal].is-visible { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; }
  [data-reveal] { opacity: 1; transform: none; }
}

/* ---------- 4. 页头页脚 ---------- */
.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 60;
  background: rgba(255, 255, 255, .78);
  backdrop-filter: blur(16px) saturate(180%);
  -webkit-backdrop-filter: blur(16px) saturate(180%);
  border-bottom: 1px solid transparent;
  transition: border-color .25s var(--ease), box-shadow .25s var(--ease), background .25s var(--ease);
}
.site-header.is-scrolled {
  background: rgba(255, 255, 255, .92);
  border-bottom-color: var(--line);
  box-shadow: 0 10px 30px -24px rgba(9, 30, 77, .7);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  height: 68px;
  max-width: calc(var(--content) + var(--gutter) * 2);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 19px;
  font-weight: 800;
  letter-spacing: -.01em;
}
.brand img { width: 34px; height: 34px; object-fit: contain; }
.brand--light { color: var(--white); }

.site-nav { display: flex; align-items: center; gap: 4px; }
.nav-link {
  display: inline-flex;
  align-items: center;
  padding: 8px 13px;
  border-radius: 9px;
  color: var(--text);
  font-size: 16px;
  font-weight: 600;
  transition: color .2s var(--ease), background .2s var(--ease);
}
.nav-link:hover { color: var(--ink); background: rgba(19, 88, 224, .07); }
.nav-link[aria-current="page"] { color: var(--brand); }
.nav-cta { margin-left: 10px; }

.nav-group { position: relative; }
.chev { width: 13px; height: 13px; margin-left: 5px; transition: transform .2s var(--ease); }
.nav-group:hover .chev, .nav-group:focus-within .chev { transform: rotate(180deg); }

.nav-panel {
  position: absolute;
  top: calc(100% + 10px);
  left: -6px;
  min-width: 330px;
  padding: 8px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--white);
  box-shadow: var(--shadow-md);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-6px);
  transition: opacity .2s var(--ease), transform .2s var(--ease), visibility .2s;
}
.nav-panel::before {
  position: absolute;
  inset: -12px 0 100%;
  content: "";
}
.nav-group:hover .nav-panel,
.nav-group:focus-within .nav-panel {
  opacity: 1;
  visibility: visible;
  transform: none;
}
.nav-panel a {
  display: block;
  padding: 9px 12px;
  border-radius: var(--radius-sm);
  transition: background .18s var(--ease);
}
.nav-panel a:hover { background: var(--brand-tint); }
.nav-panel-name { display: block; color: var(--ink); font-size: 16px; font-weight: 700; }
.nav-panel-desc { display: block; margin-top: 1px; color: var(--muted); font-size: 13.5px; line-height: 1.5; }

.menu-button {
  display: none;
  width: 42px;
  height: 42px;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--white);
  cursor: pointer;
}
.menu-button span {
  display: block;
  width: 18px;
  height: 1.8px;
  margin: 4px auto;
  border-radius: 2px;
  background: var(--ink);
  transition: transform .25s var(--ease), opacity .2s var(--ease);
}
body.nav-open .menu-button span:nth-child(1) { transform: translateY(5.8px) rotate(45deg); }
body.nav-open .menu-button span:nth-child(2) { opacity: 0; }
body.nav-open .menu-button span:nth-child(3) { transform: translateY(-5.8px) rotate(-45deg); }

.site-footer {
  color: rgba(255, 255, 255, .6);
  background: var(--navy);
}
.footer-inner {
  display: grid;
  grid-template-columns: 1.7fr 1fr 1fr 1fr;
  gap: 48px;
  max-width: calc(var(--content) + var(--gutter) * 2);
  margin: 0 auto;
  padding: 60px var(--gutter) 44px;
}
.footer-brand-col .brand { margin-bottom: 16px; }
.footer-legal-name {
  margin-bottom: 10px;
  color: rgba(255, 255, 255, .9);
  font-size: 16px;
  font-weight: 600;
}
.footer-line { color: rgba(255, 255, 255, .55); font-size: 15px; line-height: 1.9; }
.footer-line a { color: rgba(255, 255, 255, .8); }
.footer-line a:hover { color: var(--white); }
.footer-col h2 {
  margin-bottom: 14px;
  color: rgba(255, 255, 255, .95);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: .04em;
}
.footer-col a {
  display: block;
  padding: 5px 0;
  color: rgba(255, 255, 255, .55);
  font-size: 15px;
  transition: color .2s var(--ease);
}
.footer-col a:hover { color: var(--white); }

.legal-bar {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px;
  max-width: calc(var(--content) + var(--gutter) * 2);
  margin: 0 auto;
  padding: 20px var(--gutter) 32px;
  border-top: 1px solid rgba(255, 255, 255, .1);
}
.legal-bar p { color: rgba(255, 255, 255, .45); font-size: 14px; }
.beian { display: flex; flex-wrap: wrap; gap: 18px; }
.beian a { color: rgba(255, 255, 255, .55); }
.beian a:hover { color: var(--white); }

/* ---------- 5. 首页 ---------- */
.hero {
  position: relative;
  padding: 132px 0 clamp(56px, 6vw, 88px);
  overflow: hidden;
}
.hero-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(900px 480px at 22% -8%, rgba(19, 88, 224, .18), transparent 62%),
    radial-gradient(680px 440px at 95% 8%, rgba(94, 76, 235, .13), transparent 62%),
    radial-gradient(600px 400px at 60% 100%, rgba(56, 160, 255, .1), transparent 64%),
    linear-gradient(180deg, #f5f9ff 0%, #fdfeff 70%, var(--white) 100%);
}
.hero-bg::after {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(19, 88, 224, .05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(19, 88, 224, .05) 1px, transparent 1px);
  background-size: 72px 72px;
  -webkit-mask-image: radial-gradient(760px 420px at 25% 20%, #000, transparent 74%);
  mask-image: radial-gradient(760px 420px at 25% 20%, #000, transparent 74%);
  content: "";
}
.hero-inner {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.06fr);
  gap: clamp(40px, 4.5vw, 64px);
  align-items: center;
}

.pill {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  margin-bottom: 24px;
  padding: 6px 16px 6px 12px;
  border: 1px solid rgba(19, 88, 224, .2);
  border-radius: 999px;
  color: var(--brand-strong);
  background: rgba(255, 255, 255, .78);
  box-shadow: 0 6px 18px -12px rgba(19, 88, 224, .7);
  font-size: 14.5px;
  font-weight: 600;
}
.pill-dot {
  position: relative;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--brand);
}
.pill-dot::after {
  position: absolute;
  inset: -4px;
  border: 1px solid rgba(19, 88, 224, .45);
  border-radius: 50%;
  animation: ping 2.4s var(--ease) infinite;
  content: "";
}
@keyframes ping {
  0% { transform: scale(.6); opacity: 1; }
  80%, 100% { transform: scale(1.4); opacity: 0; }
}

.hero h1 {
  font-size: clamp(38px, 4.6vw, 60px);
  line-height: 1.12;
  letter-spacing: -.035em;
}
.hero h1 em {
  background: linear-gradient(120deg, var(--brand-light), var(--brand) 45%, var(--brand-strong));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero-lead {
  max-width: 560px;
  margin-top: 22px;
  font-size: 19px;
  line-height: 1.85;
}
.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 34px;
}
.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 0;
  margin-top: 34px;
}
.hero-meta li { display: flex; align-items: center; }
.hero-meta li + li::before {
  margin: 0 15px;
  color: #c9d3e2;
  content: "·";
}
.hero-meta a {
  color: var(--muted);
  font-size: 15.5px;
  font-weight: 600;
  transition: color .2s var(--ease);
}
.hero-meta a:hover { color: var(--brand); }

.offer-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.offer-card {
  padding: 28px 26px 30px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--white);
  transition: transform .25s var(--ease), box-shadow .25s var(--ease), border-color .25s var(--ease);
}
.offer-card:hover {
  transform: translateY(-4px);
  border-color: rgba(19, 88, 224, .28);
  box-shadow: var(--shadow-md);
}
.offer-icon {
  display: grid;
  place-content: center;
  width: 46px;
  height: 46px;
  margin-bottom: 20px;
  border-radius: 13px;
  color: var(--brand);
  background: linear-gradient(150deg, #eaf2ff, #dbe8ff);
}
.offer-card h3 { margin-bottom: 10px; font-size: 20px; }
.offer-card p { font-size: 16px; line-height: 1.8; }

.product-layout {
  display: grid;
  grid-template-columns: minmax(0, .95fr) minmax(0, 1.05fr);
  gap: clamp(40px, 4.5vw, 72px);
  align-items: start;
}
.product--flip .product-layout { grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr); }
.product--flip .product-copy { grid-column: 2; grid-row: 1; }
.product--flip .product-media { grid-column: 1; grid-row: 1; }
.product-media { position: sticky; top: 92px; }

.product-tagline {
  margin-top: 14px;
  color: var(--ink);
  font-size: clamp(19px, 2vw, 23px);
  font-weight: 700;
  line-height: 1.5;
  letter-spacing: -.01em;
}
.product-tagline--sm { font-size: 19px; margin-top: 8px; }

.feature-list { margin-top: 30px; }
.feature {
  display: flex;
  gap: 15px;
  padding: 20px 0;
  border-top: 1px solid var(--line);
}
.feature-icon {
  display: grid;
  place-content: center;
  width: 40px;
  height: 40px;
  border-radius: 11px;
  color: var(--brand);
  background: var(--brand-tint);
}
.band-soft .feature-icon { background: #e7effe; }
.feature h3 { margin-bottom: 5px; font-size: 18px; }
.feature p { font-size: 16px; line-height: 1.8; }

.viewer-slide { margin: 0; }
.viewer-slide[hidden] { display: none; }
.viewer-slide .shot img { aspect-ratio: 1024 / 697; object-fit: cover; object-position: top center; }
.viewer-slide figcaption {
  margin-top: 14px;
  color: var(--muted);
  font-size: 14.5px;
  line-height: 1.7;
}
.viewer-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 18px;
}
.viewer-tab {
  padding: 7px 15px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--text);
  background: var(--white);
  font-size: 14.5px;
  font-weight: 600;
  cursor: pointer;
  transition: color .2s var(--ease), background .2s var(--ease), border-color .2s var(--ease);
}
.viewer-tab:hover { color: var(--brand); border-color: rgba(19, 88, 224, .38); }
.viewer-tab.is-active {
  color: var(--white);
  background: var(--brand);
  border-color: var(--brand);
}

.android {
  display: grid;
  grid-template-columns: 300px minmax(0, 1fr);
  gap: clamp(40px, 4.5vw, 72px);
  align-items: center;
  margin-top: clamp(48px, 5vw, 76px);
  padding-top: clamp(40px, 4.5vw, 60px);
  border-top: 1px solid var(--line);
}
.android-copy h3 { font-size: clamp(25px, 2.6vw, 32px); }
.android-copy > p { margin-top: 14px; font-size: 17px; line-height: 1.85; }
.check-list { display: grid; gap: 10px; margin-top: 22px; }
.check-list li {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  font-size: 16.5px;
}
.check-list .ico { color: var(--brand); }
.phone-shot { margin: 0; }
.phone-shot img {
  width: 100%;
  max-width: 300px;
  margin: 0 auto;
  border: 1px solid var(--line);
  border-radius: 26px;
  box-shadow: var(--shadow-lg);
}

.contact {
  position: relative;
  overflow: hidden;
  padding: clamp(60px, 6.5vw, 96px) 0;
  color: var(--white);
  background: var(--navy);
}
.contact-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(760px 420px at 12% 0%, rgba(30, 104, 240, .38), transparent 62%),
    radial-gradient(620px 400px at 88% 100%, rgba(76, 60, 200, .32), transparent 60%);
}
.contact-inner {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: clamp(40px, 5vw, 64px);
  align-items: center;
}
.contact-copy h2 { color: var(--white); font-size: clamp(29px, 3.2vw, 40px); }
.contact-copy > p {
  max-width: 540px;
  margin-top: 16px;
  color: rgba(255, 255, 255, .7);
  font-size: 18px;
  line-height: 1.85;
}
.contact-actions { margin-top: 30px; }
.contact-facts {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px 40px;
  max-width: 640px;
  margin-top: 36px;
  padding-top: 28px;
  border-top: 1px solid rgba(255, 255, 255, .14);
}
.contact-facts dt {
  display: flex;
  align-items: center;
  gap: 7px;
  color: rgba(255, 255, 255, .5);
  font-size: 14px;
}
.contact-facts dd {
  margin-top: 6px;
  color: rgba(255, 255, 255, .92);
  font-size: 16.5px;
  line-height: 1.6;
}

.qr-card {
  padding: 20px;
  border-radius: var(--radius-lg);
  background: var(--white);
  box-shadow: 0 30px 60px -30px rgba(0, 0, 0, .8);
  text-align: center;
}
.qr-frame {
  overflow: hidden;
  border-radius: var(--radius);
  background: var(--white);
}
.qr-frame img {
  width: 100%;
  aspect-ratio: 1;
  object-fit: cover;
  object-position: 50% 56%;
}
.qr-title {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  margin-top: 16px;
  color: var(--ink);
  font-size: 16px;
  font-weight: 700;
}
.qr-title .ico { color: var(--brand); }
.qr-desc { margin-top: 4px; color: var(--muted); font-size: 14.5px; }

/* ---------- 6. 内页 ---------- */
.page-hero {
  position: relative;
  padding: 128px 0 clamp(40px, 4.5vw, 60px);
  overflow: hidden;
  border-bottom: 1px solid var(--line-soft);
}
.page-hero-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(680px 320px at 12% 0%, rgba(19, 88, 224, .14), transparent 64%),
    radial-gradient(520px 300px at 88% 10%, rgba(94, 76, 235, .1), transparent 62%),
    linear-gradient(180deg, #f5f9ff, var(--white));
}
.page-hero .container { position: relative; }
.page-hero h1 { font-size: clamp(33px, 4.4vw, 52px); }
.page-hero-lead { margin-top: 14px; font-size: 18px; }
.crumbs {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 18px;
  color: var(--muted);
  font-size: 14px;
}
.crumbs a:hover { color: var(--brand); }

.about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 380px;
  gap: clamp(40px, 5vw, 64px);
  align-items: start;
}
.about-copy p {
  margin-bottom: 20px;
  font-size: 18.5px;
  line-height: 1.95;
}
.about-copy p:last-child { margin-bottom: 0; }

.info-card {
  padding: 28px 30px 30px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--soft);
}
.band-soft .info-card { background: var(--white); box-shadow: var(--shadow-sm); }
.info-card h2 {
  margin-bottom: 18px;
  font-size: 18px;
  letter-spacing: 0;
}
.info-card--wide .facts {
  display: grid;
  grid-template-columns: 1fr 1fr;
  column-gap: 56px;
}
.info-card--wide .facts > div:nth-child(2) { border-top: 0; padding-top: 0; }

.doc-frame {
  margin: 0;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: linear-gradient(180deg, #f8fbff, #eef3fb);
  box-shadow: var(--shadow-sm);
}
.doc-frame img {
  width: 100%;
  border-radius: 8px;
  box-shadow: var(--shadow-sm);
}

.card-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}
.link-card {
  padding: 30px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--white);
  transition: transform .25s var(--ease), box-shadow .25s var(--ease), border-color .25s var(--ease);
}
.link-card:hover {
  transform: translateY(-3px);
  border-color: rgba(19, 88, 224, .28);
  box-shadow: var(--shadow-md);
}
.card-platform {
  margin-bottom: 10px;
  color: var(--muted);
  font-size: 13.5px;
  font-weight: 600;
  letter-spacing: .06em;
}
.link-card h3 { font-size: 22px; }
.card-tagline { margin: 8px 0 12px; color: var(--brand); font-size: 16px; font-weight: 600; }
.link-card > p { font-size: 16px; line-height: 1.8; }
.link-card .text-link { margin-top: 18px; }

.cert-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
}
.cert-card {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--white);
  box-shadow: var(--shadow-sm);
}
.cert-image {
  padding: 22px;
  background: linear-gradient(180deg, #f7faff, #eef3fb);
  border-bottom: 1px solid var(--line-soft);
}
.cert-image img {
  width: 100%;
  border-radius: 6px;
  box-shadow: var(--shadow-sm);
}
.cert-body { padding: 24px 26px 28px; }
.cert-body h3 { margin-bottom: 16px; font-size: 19px; }

.algo-card {
  padding: clamp(26px, 3vw, 40px);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--white);
  box-shadow: var(--shadow-sm);
}
.algo-head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px 24px;
  padding-bottom: 22px;
  border-bottom: 1px solid var(--line);
}
.algo-head h3 { font-size: 23px; }
.algo-number { margin-top: 6px; color: var(--brand-strong); font-size: 15.5px; }
.algo-links { display: flex; flex-wrap: wrap; align-items: center; gap: 16px; }
.algo-body {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 26px 48px;
  margin-top: 26px;
}
.algo-body dt {
  margin-bottom: 8px;
  color: var(--ink);
  font-size: 16px;
  font-weight: 700;
}
.algo-body dd { color: var(--text); font-size: 16px; line-height: 1.9; }
.algo-foot {
  margin-top: 26px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 15px;
}
.algo-foot a { color: var(--brand); }
.algo-foot a:hover { text-decoration: underline; }

.number-list { border-top: 1px solid var(--line); }
.number-list li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px 24px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
}
.number-list-name { color: var(--ink); font-size: 17.5px; font-weight: 700; }
.number-list-code { color: var(--brand-strong); font-size: 15.5px; }

.cta {
  padding: clamp(52px, 6vw, 76px) 0;
  background: linear-gradient(135deg, #eef4ff, #f7f9fe 55%, #f2f0ff);
  border-top: 1px solid var(--line-soft);
}
.cta-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
}
.cta h2 { font-size: clamp(25px, 2.8vw, 34px); }
.cta p { margin-top: 12px; font-size: 17px; }
.cta-actions { display: flex; flex-wrap: wrap; gap: 12px; }

/* ---------- 7. 响应式 ---------- */
@media (max-width: 1080px) {
  .offer-grid { grid-template-columns: 1fr 1fr; }
  .footer-inner { grid-template-columns: 1.4fr 1fr 1fr; }
  .footer-brand-col { grid-column: 1 / -1; }
  .about-body { grid-template-columns: minmax(0, 1fr) 320px; }
  .android { grid-template-columns: 260px minmax(0, 1fr); }
}

@media (max-width: 900px) {
  .menu-button { display: block; }
  .site-nav {
    position: fixed;
    inset: 68px 0 auto;
    display: none;
    max-height: calc(100vh - 68px);
    padding: 14px var(--gutter) 26px;
    overflow-y: auto;
    background: var(--white);
    border-bottom: 1px solid var(--line);
    box-shadow: 0 24px 40px -28px rgba(9, 30, 77, .8);
  }
  .site-nav.is-open { display: block; }
  .nav-link {
    display: flex;
    justify-content: space-between;
    padding: 12px 4px;
    font-size: 17px;
  }
  .nav-link--parent { pointer-events: none; color: var(--muted); font-size: 13.5px; letter-spacing: .08em; }
  .chev, .nav-group:hover .chev { display: none; }
  .nav-panel {
    position: static;
    min-width: 0;
    padding: 0 0 8px;
    border: 0;
    border-radius: 0;
    box-shadow: none;
    opacity: 1;
    visibility: visible;
    transform: none;
  }
  .nav-panel::before { display: none; }
  .nav-panel a { padding: 11px 4px; border-radius: 0; border-bottom: 1px solid var(--line-soft); }
  .nav-panel a:hover { background: transparent; }
  .nav-cta { width: 100%; height: 48px; margin: 16px 0 0; font-size: 16px; }
  .nav-group + .nav-link { border-top: 1px solid var(--line-soft); }

  .hero { padding-top: 108px; }
  .hero-inner { grid-template-columns: 1fr; gap: 40px; }
  .hero-lead { max-width: none; }

  .product-layout { grid-template-columns: 1fr; }
  .product--flip .product-copy,
  .product--flip .product-media { grid-column: auto; grid-row: auto; }
  .product-media { position: static; }

  .android { grid-template-columns: 1fr; gap: 32px; }
  .android-copy { order: 1; }
  .phone-shot { order: 2; }
  .phone-shot img { max-width: 270px; }

  .contact-inner { grid-template-columns: 1fr; }
  .qr-card { max-width: 320px; }
  .about-body { grid-template-columns: 1fr; }
  .split { grid-template-columns: 1fr; }
  .card-grid, .cert-grid { grid-template-columns: 1fr; }
  .algo-body { grid-template-columns: 1fr; gap: 22px; }
  .info-card--wide .facts { grid-template-columns: 1fr; }
  .info-card--wide .facts > div:nth-child(2) { border-top: 1px solid var(--line); padding-top: 14px; }
}

@media (max-width: 620px) {
  :root { --gutter: 18px; }
  body { font-size: 16.5px; }
  .hero { padding-top: 100px; }
  .hero-lead { font-size: 17.5px; }
  .hero-actions .btn { flex: 1 1 auto; }
  .hero-meta { gap: 8px; }
  .hero-meta li + li::before { display: none; }
  .hero-meta a {
    display: block;
    padding: 6px 13px;
    border: 1px solid var(--line);
    border-radius: 999px;
    background: rgba(255, 255, 255, .7);
    font-size: 14.5px;
  }
  .hero-bg::after { background-size: 56px 56px; }
  .shot-bar { height: 28px; }
  .offer-grid { grid-template-columns: 1fr; }
  .section-lead, .about-copy p { font-size: 17.5px; }
  .viewer-tabs { gap: 7px; }
  .viewer-tab { padding: 6px 13px; font-size: 14px; }
  .contact-facts { grid-template-columns: 1fr; gap: 18px; }
  .footer-inner { grid-template-columns: 1fr 1fr; gap: 32px; padding-top: 46px; }
  .legal-bar { flex-direction: column; gap: 8px; }
  .cta-inner { flex-direction: column; align-items: flex-start; }
  .cta-actions .btn { flex: 1 1 auto; }
  .algo-head h3 { font-size: 20px; }
}