:root {
  --bg: #ffffff;
  --soft: #f5f5f7;
  --soft-2: #ececee;
  --line: #e6e6eb;
  --text: #1d1d1f;
  --muted: #6e6e73;
  --muted-2: #86868b;
  --blue: #0071e3;
  --r-card: 26px;
  --r-pill: 980px;
  --ease: cubic-bezier(.22, .8, .28, 1);
  --wrap: 1080px;
}

* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro SC", "SF Pro Text", "PingFang SC",
    "Helvetica Neue", "Microsoft YaHei", sans-serif;
  font-size: 16px;
  line-height: 1.55;
  letter-spacing: -0.01em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a { color: inherit; text-decoration: none; }
h1, h2, h3 { margin: 0; font-weight: 600; letter-spacing: -0.028em; text-wrap: balance; }
code {
  padding: 1px 6px;
  border-radius: 6px;
  background: var(--soft-2);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: .9em;
}
section[id] { scroll-margin-top: 72px; }

/* ------------------------------ 顶栏 ------------------------------ */
.bar {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(255, 255, 255, .72);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid rgba(0, 0, 0, .06);
}
.bar-in {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 11px 24px;
}
.brand { display: inline-flex; align-items: center; gap: 9px; }
.mark { display: inline-flex; border-radius: 8px; overflow: hidden; }
.brand-name { font-size: 15px; font-weight: 600; letter-spacing: -0.02em; }
.nav { display: flex; gap: 2px; }
.nav a {
  padding: 7px 14px;
  border-radius: var(--r-pill);
  font-size: 13.5px;
  color: var(--muted);
  transition: color .25s var(--ease), background .25s var(--ease);
}
.nav a:hover { color: var(--text); background: rgba(0, 0, 0, .05); }

/* ------------------------------ 首屏 ------------------------------ */
.hero {
  position: relative;
  isolation: isolate;
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 132px 24px 96px;
  text-align: center;
}
.hero::before {
  content: "";
  position: absolute;
  left: 50%;
  top: -140px;
  width: min(920px, 92vw);
  height: 540px;
  transform: translateX(-50%);
  background: radial-gradient(closest-side, rgba(0, 113, 227, .075), transparent 72%);
  pointer-events: none;
  z-index: -1;
}
.eyebrow {
  margin: 0 0 14px;
  font-size: 13.5px;
  font-weight: 600;
  letter-spacing: .06em;
  color: var(--blue);
}
.hero h1 {
  font-size: clamp(58px, 12vw, 128px);
  font-weight: 600;
  line-height: 1;
  letter-spacing: -0.045em;
}
.lede {
  max-width: 33ch;
  margin: 22px auto 0;
  font-size: clamp(17px, 2.1vw, 21px);
  line-height: 1.5;
  color: var(--muted);
  letter-spacing: -0.012em;
}
.cta {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  margin-top: 32px;
}
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 13px 26px;
  border: 0;
  border-radius: var(--r-pill);
  background: var(--soft-2);
  color: var(--text);
  font-family: inherit;
  font-size: 15px;
  font-weight: 500;
  letter-spacing: -0.01em;
  cursor: pointer;
  transition: transform .3s var(--ease), background .3s var(--ease), box-shadow .3s var(--ease);
}
.btn:hover { transform: translateY(-1px); }
.btn.primary { background: var(--blue); color: #ffffff; }
.btn.primary:hover { background: #0077ed; box-shadow: 0 8px 22px rgba(0, 113, 227, .28); }
.btn.ghost { background: #ffffff; box-shadow: inset 0 0 0 1px var(--line); }
.btn.ghost:hover { background: var(--soft); }
.btn.wide { width: 100%; }

.facts {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0;
  margin: 56px 0 0;
  padding: 0;
  list-style: none;
}
.facts li {
  padding: 0 30px;
  border-left: 1px solid var(--line);
  font-size: 13px;
  color: var(--muted-2);
  text-align: center;
}
.facts li:first-child { border-left: 0; }
.facts b {
  display: block;
  font-size: 26px;
  font-weight: 600;
  color: var(--text);
  letter-spacing: -0.03em;
  font-variant-numeric: tabular-nums;
}
.hero-art { margin: 62px auto 0; max-width: 560px; color: var(--text); }
.hero-art svg { width: 100%; height: auto; }

/* ------------------------------ 区块 ------------------------------ */
.section { max-width: var(--wrap); margin: 0 auto; padding: 0 24px 104px; }
.section-head { margin-bottom: 26px; }
.section-head h2 { font-size: clamp(26px, 4vw, 40px); letter-spacing: -0.03em; }
.section-head p { margin: 10px 0 0; font-size: 16.5px; color: var(--muted); }

/* 分类导航 chips */
.chips { display: flex; flex-wrap: wrap; gap: 8px; margin: -6px 0 30px; }
.chips a {
  padding: 8px 16px;
  border-radius: var(--r-pill);
  background: var(--soft);
  font-size: 13.5px;
  color: var(--muted);
  transition: background .3s var(--ease), color .3s var(--ease), transform .3s var(--ease);
}
.chips a:hover { background: var(--soft-2); color: var(--text); transform: translateY(-1px); }

/* 分类区块 */
.cat {
  display: grid;
  grid-template-columns: 236px minmax(0, 1fr);
  gap: 40px;
  padding: 40px 0;
  border-top: 1px solid var(--line);
}
.cat-head { position: sticky; top: 86px; align-self: start; }
.cat-label {
  display: block;
  margin-bottom: 9px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .08em;
  color: var(--blue);
}
.cat-head h3 { font-size: 25px; letter-spacing: -0.032em; }
.cat-head p { margin: 11px 0 0; font-size: 14px; line-height: 1.7; color: var(--muted); }
.cat-body { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 340px)); gap: 20px; }
.cat-body.plain { display: block; }

/* 产品卡 */
.card {
  position: relative;
  display: flex;
  flex-direction: column;
  padding: 30px 28px 26px;
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: var(--r-card);
  transition: transform .4s var(--ease), box-shadow .4s var(--ease), border-color .4s var(--ease);
}
.card:hover {
  transform: translateY(-4px);
  border-color: transparent;
  box-shadow: 0 18px 40px rgba(0, 0, 0, .09);
}
.idx {
  position: absolute;
  top: 26px;
  right: 28px;
  font-size: 12.5px;
  font-weight: 600;
  color: var(--muted-2);
  font-variant-numeric: tabular-nums;
}
.tile {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 46px;
  height: 46px;
  margin-bottom: 20px;
  border-radius: 14px;
  background: var(--soft);
  color: var(--text);
}
.tile svg { width: 23px; height: 23px; }
.card h3 { font-size: 21px; }
.card-desc { margin: 9px 0 16px; font-size: 15px; color: var(--muted); }
.card-list { margin: 0; padding: 0; list-style: none; font-size: 13.5px; color: var(--muted-2); }
.card-list li { position: relative; padding-left: 15px; margin-bottom: 6px; }
.card-list li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: .62em;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--blue);
  opacity: .7;
}
.card-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-top: auto;
  padding-top: 22px;
}
.host {
  font-size: 12px;
  color: var(--muted-2);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}
.go { font-size: 14px; font-weight: 500; color: var(--blue); white-space: nowrap; }
.go::after { content: " ›"; transition: margin .25s var(--ease); }
.go:hover::after { margin-left: 3px; }

/* 账号横幅 */
.band {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 280px;
  gap: 36px;
  align-items: center;
  padding: 48px;
  background: var(--soft);
  border-radius: var(--r-card);
}
.band-text h2 { font-size: clamp(24px, 3.4vw, 34px); letter-spacing: -0.03em; }
.band-text p { margin: 12px 0 0; font-size: 16px; color: var(--muted); }
.ticks { margin: 20px 0 0; padding: 0; list-style: none; font-size: 14px; color: var(--muted); }
.ticks li { position: relative; padding-left: 24px; margin-bottom: 7px; }
.ticks li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .28em;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: rgba(0, 113, 227, .12);
}
.ticks li::after {
  content: "";
  position: absolute;
  left: 5px;
  top: .48em;
  width: 4px;
  height: 8px;
  border: 1.8px solid var(--blue);
  border-top: 0;
  border-left: 0;
  transform: rotate(42deg);
}
.band-act { display: flex; flex-direction: column; gap: 12px; }
.hint { font-size: 12.5px; color: var(--muted-2); text-align: center; }

/* 联系 */
.mail {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 24px 28px;
  border: 1px solid var(--line);
  border-radius: var(--r-card);
  transition: transform .4s var(--ease), box-shadow .4s var(--ease), border-color .4s var(--ease);
}
.mail:hover { transform: translateY(-3px); border-color: transparent; box-shadow: 0 18px 40px rgba(0, 0, 0, .09); }
.mail-ico {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: 0 0 auto;
  width: 44px;
  height: 44px;
  border-radius: 14px;
  background: var(--soft);
}
.mail-ico svg { width: 21px; height: 21px; }
.mail-body { display: flex; flex-direction: column; min-width: 0; }
.mail-body b { font-size: 16.5px; font-weight: 600; overflow-wrap: anywhere; }
.mail-body span { font-size: 13.5px; color: var(--muted-2); }
.mail-go { margin-left: auto; font-size: 14px; font-weight: 500; color: var(--blue); white-space: nowrap; }
.mail-go::after { content: " ›"; }
.mail:hover .mail-go::after { margin-left: 3px; }

/* ------------------------------ 页脚 ------------------------------ */
.foot {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 28px 24px 44px;
  border-top: 1px solid var(--line);
}
.foot-in {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
}
.foot-brand { display: inline-flex; align-items: center; gap: 8px; font-size: 13.5px; color: var(--muted); }
.mark.small { border-radius: 6px; }
.foot-links { display: flex; flex-wrap: wrap; gap: 18px; font-size: 13px; color: var(--muted-2); }
.foot-links a { transition: color .25s var(--ease); }
.foot-links a:hover { color: var(--text); }
.copy { margin: 16px 0 0; font-size: 12.5px; color: var(--muted-2); }

/* ------------------------------ 响应式 ------------------------------ */
@media (max-width: 940px) {
  .hero { padding: 92px 24px 72px; }
  .cat { grid-template-columns: minmax(0, 1fr); gap: 20px; padding: 32px 0; }
  .cat-head { position: static; }
  .cat-body { grid-template-columns: minmax(0, 1fr); }
  .band { grid-template-columns: minmax(0, 1fr); padding: 32px 26px; }
  .section { padding-bottom: 80px; }
}
@media (max-width: 560px) {
  .bar-in { padding: 10px 16px; }
  .hero, .section, .foot { padding-left: 18px; padding-right: 18px; }
  .facts li { padding: 0 16px; }
  .facts b { font-size: 22px; }
  .lede { max-width: none; }
  .mail { align-items: flex-start; padding: 20px; }
  .mail-go { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; }
}