:root {
  --bg: #ffffff;
  --bg-elev: #ffffff;
  --text: #18181b;
  --muted: #52525b;
  --faint: #71717a;
  --line: #e4e4e7;
  --line-strong: #d4d4d8;
  --card: rgba(255, 255, 255, 0.86);
  --soft: #fafafa;
  --chip: #f4f4f5;
  --bubble: #f4f4f5;
  --bubble-ai: #ecfdf5;
  --bubble-ai-line: #a7f3d0;
  --header: rgba(255, 255, 255, 0.9);
  --emerald: #10b981;
  --emerald-deep: #059669;
  --emerald-text: #047857;
  --teal: #2dd4bf;
  --shadow: 0 20px 50px rgba(24, 24, 27, 0.06);
  --orb: rgba(16, 185, 129, 0.08);
  --danger: #dc2626;
  --ok: #047857;
  --radius: 16px;
  --header-h: 72px;
  --font: "PingFang SC", "Hiragino Sans GB", "Noto Sans SC", "Microsoft YaHei", "Source Han Sans SC", system-ui, sans-serif;
  --mono: "SFMono-Regular", "SF Mono", ui-monospace, "Cascadia Mono", Menlo, Consolas, monospace;
  color-scheme: light;
}

html.dark {
  --bg: #09090b;
  --bg-elev: #0c0c0f;
  --text: #fafafa;
  --muted: rgba(255, 255, 255, 0.62);
  --faint: rgba(255, 255, 255, 0.4);
  --line: rgba(255, 255, 255, 0.08);
  --line-strong: rgba(255, 255, 255, 0.16);
  --card: rgba(255, 255, 255, 0.04);
  --soft: rgba(255, 255, 255, 0.015);
  --chip: rgba(255, 255, 255, 0.06);
  --bubble: rgba(255, 255, 255, 0.08);
  --bubble-ai: rgba(16, 185, 129, 0.1);
  --bubble-ai-line: rgba(16, 185, 129, 0.22);
  --header: rgba(9, 9, 11, 0.8);
  --emerald-text: #34d399;
  --shadow: none;
  --orb: rgba(16, 185, 129, 0.1);
  --danger: #fca5a5;
  --ok: #6ee7b7;
  color-scheme: dark;
}

*,
*::before,
*::after { box-sizing: border-box; }

/* hidden 会把 html 变成滚动层，滚到底后吸顶栏会被顶出屏幕，再往上滑回不来。clip 只裁掉横向溢出。 */
html { overflow-x: clip; }
section[id], article[id] { scroll-margin-top: 92px; }

body {
  margin: 0;
  min-height: 100vh;
  padding-top: calc(var(--header-h) + 1px);
  overflow-x: clip;
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  font-size: 16px;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

img, svg { display: block; max-width: 100%; }
button, input, select, textarea { font: inherit; color: inherit; }
a { color: inherit; text-decoration: none; }
button { cursor: pointer; }
p { margin: 0; }
h1, h2, h3, h4 { margin: 0; letter-spacing: -0.03em; line-height: 1.2; }

::selection { background: rgba(16, 185, 129, 0.28); }

.skip {
  position: fixed;
  left: 16px;
  top: 12px;
  z-index: 80;
  background: var(--emerald);
  color: #fff;
  padding: 8px 12px;
  border-radius: 8px;
  transform: translateY(-200%);
}
.skip:focus { transform: none; }

.orbs {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  contain: paint;
  background:
    radial-gradient(520px 420px at 10% 0%, rgba(16, 185, 129, 0.16), transparent 70%),
    radial-gradient(380px 320px at 100% 22%, rgba(45, 212, 191, 0.1), transparent 72%);
}
.orbs span { display: none; }

.container {
  width: min(1152px, calc(100% - 48px));
  margin-inline: auto;
}

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 40;
  border-bottom: 1px solid var(--line);
  background: var(--header);
  -webkit-backdrop-filter: blur(20px);
  backdrop-filter: blur(20px);
}
.header-inner {
  height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 750;
  letter-spacing: -0.03em;
  flex: none;
}
.brand-mark {
  width: 36px;
  height: 36px;
  border-radius: 12px;
  background: var(--emerald);
  display: grid;
  place-items: center;
  box-shadow: 0 8px 20px rgba(16, 185, 129, 0.25);
}
.brand small {
  display: block;
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.08em;
  color: var(--faint);
  line-height: 1.2;
}
.icon-sun, .icon-moon { display: none; }
html.dark .icon-sun { display: block; }
html:not(.dark) .icon-moon { display: block; }
.nav-desktop {
  display: flex;
  align-items: center;
  gap: 26px;
  color: var(--faint);
  font-size: 14px;
}
.nav-desktop a:hover,
.nav-desktop a[aria-current="page"] { color: var(--text); }
.header-actions { display: flex; align-items: center; gap: 8px; }
.nav-toggle, .icon-btn {
  width: 36px;
  height: 36px;
  border-radius: 999px;
  border: 1px solid var(--line-strong);
  background: transparent;
  color: var(--muted);
  display: inline-grid;
  place-items: center;
}
.nav-toggle { display: none; }
.icon-btn:hover, .nav-toggle:hover { color: var(--text); border-color: var(--text); }

.nav-panel {
  display: none;
  border-top: 1px solid var(--line);
  background: var(--header);
  backdrop-filter: blur(20px);
}
.nav-panel.open { display: block; }
.nav-panel .container {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 12px 0 18px;
}
.nav-panel a {
  padding: 10px 4px;
  color: var(--muted);
  border-radius: 8px;
}
.nav-panel a[aria-current="page"],
.nav-panel a:hover { color: var(--text); }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border-radius: 999px;
  padding: 12px 20px;
  font-size: 14px;
  font-weight: 600;
  border: 1px solid transparent;
  transition: 0.15s ease;
  line-height: 1.2;
}
.btn-brand { background: var(--emerald); color: #fff; }
.btn-brand:hover { background: var(--emerald-deep); }
.btn-ghost { background: transparent; border-color: var(--line-strong); color: var(--muted); }
.btn-ghost:hover { color: var(--text); border-color: var(--text); }
.btn-sm { padding: 8px 14px; font-size: 13.5px; }
.btn:focus-visible, .icon-btn:focus-visible, a:focus-visible, button:focus-visible, input:focus-visible, select:focus-visible, textarea:focus-visible {
  outline: 2px solid var(--emerald);
  outline-offset: 2px;
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border: 1px solid rgba(16, 185, 129, 0.35);
  background: rgba(16, 185, 129, 0.1);
  color: var(--emerald-text);
  border-radius: 999px;
  padding: 4px 12px;
  font-size: 13.5px;
  font-weight: 600;
}
.eyebrow {
  color: var(--emerald-text);
  font-size: 14px;
  font-weight: 700;
  margin-bottom: 12px;
}
.gradient {
  background: linear-gradient(90deg, #10b981, #2dd4bf);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.lede {
  color: var(--muted);
  font-size: 17px;
  line-height: 1.85;
}
.muted { color: var(--muted); }
.faint { color: var(--faint); }
.section { padding: 88px 0; }
.band { background: var(--soft); }
.section-head { max-width: 720px; margin-bottom: 36px; }
.section-head h2, .page-hero h1, .hero h1 { font-size: clamp(34px, 4vw, 52px); }
.section-head.center, .center { text-align: center; margin-inline: auto; }

.hero { padding: 72px 0 36px; }
.hero-grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 64px;
  align-items: center;
}
.hero h1 { font-size: clamp(40px, 5vw, 60px); }
.hero .lede { margin-top: 22px; max-width: 540px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }
.ticks { display: flex; flex-wrap: wrap; gap: 16px 22px; margin: 26px 0 0; padding: 0; list-style: none; color: var(--faint); font-size: 14px; }
.ticks li { display: flex; align-items: center; gap: 6px; }
.ticks svg { color: var(--emerald); flex: none; }

.card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--card);
  backdrop-filter: blur(12px);
  box-shadow: var(--shadow);
}
.glow-wrap { position: relative; }
.glow-wrap::before {
  content: "";
  position: absolute;
  inset: 10% -6%;
  z-index: -1;
  background: radial-gradient(circle, rgba(16, 185, 129, 0.18), transparent 68%);
  filter: blur(10px);
}

.demo { padding: 18px 18px 14px; }
.demo-top, .row-between { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.demo-top { padding-bottom: 14px; border-bottom: 1px solid var(--line); margin-bottom: 14px; }
.who { display: flex; align-items: center; gap: 8px; font-size: 14px; font-weight: 650; }
.online { display: inline-flex; align-items: center; gap: 6px; color: var(--emerald-text); font-size: 13px; font-weight: 600; }
.dot {
  width: 7px; height: 7px; border-radius: 99px; background: var(--emerald);
  box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7);
  animation: pulse 1.8s infinite;
}
@keyframes pulse {
  70% { box-shadow: 0 0 0 6px rgba(16, 185, 129, 0); }
  100% { box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); }
}
.msgs { display: flex; flex-direction: column; gap: 12px; min-height: 250px; }
.msg { display: flex; gap: 8px; align-items: flex-start; font-size: 14px; line-height: 1.65; }
.msg.user { flex-direction: row; }
.msg.ai { flex-direction: row-reverse; }
.avatar {
  width: 26px; height: 26px; border-radius: 99px; flex: none;
  display: grid; place-items: center; font-size: 11px; font-weight: 700;
}
.avatar.u { background: var(--chip); color: var(--muted); }
.avatar.ai { background: var(--emerald); color: #fff; }
.bubble { max-width: 86%; padding: 10px 12px; }
.msg.user .bubble { background: var(--bubble); border-radius: 16px 16px 16px 4px; }
.msg.ai .bubble {
  background: var(--bubble-ai);
  border: 1px solid var(--bubble-ai-line);
  border-radius: 16px 16px 4px 16px;
}
.bubble strong { color: var(--emerald-text); font-weight: 650; }
.source { display: block; margin-top: 6px; color: var(--faint); font-size: 12px; }
.scene-tabs { display: flex; gap: 8px; margin-top: 14px; }
.scene-tabs button {
  flex: 1;
  border: 1px solid var(--line);
  background: transparent;
  border-radius: 999px;
  padding: 7px 8px;
  font-size: 12.5px;
  color: var(--faint);
}
.scene-tabs button[aria-selected="true"] {
  color: var(--emerald-text);
  border-color: rgba(16, 185, 129, 0.45);
  background: rgba(16, 185, 129, 0.1);
}
.caption { margin-top: 10px; font-size: 12px; color: var(--faint); text-align: center; }

.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  margin: 28px 0 10px;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: var(--card);
}
.stat { padding: 22px 22px 20px; }
.stat + .stat { border-left: 1px solid var(--line); }
.stat b {
  display: block;
  font-size: 34px;
  letter-spacing: -0.04em;
  line-height: 1;
  margin-bottom: 8px;
}
.stat span { display: block; font-size: 14px; color: var(--muted); }

.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }

.module, .cap, .audience, .principle, .price-card, .faq details {
  padding: 22px;
  height: 100%;
}
.module h3, .cap h3, .audience h3, .principle h3 { font-size: 18px; margin: 14px 0 8px; }
.icon-sq {
  width: 40px; height: 40px; border-radius: 12px;
  display: grid; place-items: center;
  background: var(--chip);
  color: var(--emerald-text);
}
.chips { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 16px; }
.chip {
  font-size: 12.5px;
  color: var(--muted);
  background: var(--chip);
  border-radius: 999px;
  padding: 4px 10px;
}
.link-more {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 16px;
  color: var(--emerald-text);
  font-size: 14px;
  font-weight: 650;
}
.link-more:hover { gap: 10px; }

.cap p, .module p, .audience p, .principle p { color: var(--muted); font-size: 14.5px; }
.cap { min-height: 100%; }
.num-watermark {
  position: relative;
  overflow: hidden;
}
.num-watermark .wm {
  position: absolute;
  right: 12px;
  top: -8px;
  font-size: 84px;
  font-weight: 750;
  letter-spacing: -0.06em;
  color: rgba(24, 24, 27, 0.05);
  line-height: 1;
  pointer-events: none;
}
html.dark .num-watermark .wm { color: rgba(255, 255, 255, 0.045); }
.audience p.pain { color: var(--muted); font-size: 14px; margin: 8px 0; }
.audience p.solve { color: var(--text); font-size: 14.5px; }

.layers { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 12px; }
.layers li {
  display: grid;
  grid-template-columns: 72px 1fr;
  gap: 8px;
  padding: 20px 22px;
  align-items: start;
}
.layers .idx {
  font-size: 22px;
  font-weight: 750;
  color: var(--emerald-text);
  letter-spacing: -0.04em;
}
.layers h3 { font-size: 18px; margin-bottom: 6px; }
.layers p { color: var(--muted); font-size: 14.5px; }

.split { display: grid; grid-template-columns: 0.9fr 1.1fr; gap: 48px; align-items: center; }
.identity { padding: 18px; }
.id-head { display: flex; align-items: center; gap: 10px; margin-bottom: 14px; }
.id-ava {
  width: 38px; height: 38px; border-radius: 12px;
  background: linear-gradient(135deg, #10b981, #2dd4bf);
  color: #fff; display: grid; place-items: center; font-weight: 750;
}
.id-list { display: flex; flex-direction: column; gap: 8px; }
.id-item {
  width: 100%;
  text-align: left;
  border: 1px solid var(--line);
  background: transparent;
  border-radius: 12px;
  padding: 12px 14px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}
.id-copy { display: flex; flex-direction: column; gap: 2px; }
.id-copy small { color: var(--faint); font-size: 12.5px; font-weight: 500; }
.id-item[aria-pressed="true"] {
  border-color: rgba(16, 185, 129, 0.5);
  background: rgba(16, 185, 129, 0.08);
}
.id-item b { font-size: 14.5px; }
.id-item span, .id-meta { color: var(--faint); font-size: 12.5px; }
.badge {
  font-size: 12px;
  font-weight: 700;
  color: var(--emerald-text);
  background: rgba(16, 185, 129, 0.12);
  border-radius: 999px;
  padding: 2px 8px;
  align-self: center;
}
.badge.wait { color: #b45309; background: rgba(245, 158, 11, 0.15); }
html.dark .badge.wait { color: #fbbf24; }
.id-detail {
  margin-top: 12px;
  border-top: 1px solid var(--line);
  padding-top: 12px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}
.id-detail div { background: var(--chip); border-radius: 12px; padding: 10px 12px; }
.id-detail small { display: block; color: var(--faint); font-size: 12px; }
.id-detail b { font-size: 14px; font-weight: 650; }

.console {
  border-radius: 16px;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.08);
  background: #18181b;
  color: rgba(255, 255, 255, 0.86);
  min-height: 100%;
  display: flex;
  flex-direction: column;
}
.console-bar {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 12px 16px;
  background: rgba(255, 255, 255, 0.04);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  color: rgba(255, 255, 255, 0.4);
  font-size: 12px;
  font-family: var(--mono);
}
.console-bar i { width: 10px; height: 10px; border-radius: 99px; display: block; }
.console-bar i:nth-child(1) { background: #f87171aa; }
.console-bar i:nth-child(2) { background: #fbbf24aa; }
.console-bar i:nth-child(3) { background: #34d399aa; }
.console-body { padding: 8px 8px 16px; }
.step-line {
  display: grid;
  grid-template-columns: 28px 1fr;
  gap: 10px;
  padding: 12px;
  border-radius: 12px;
}
.step-line + .step-line { margin-top: 4px; }
.step-no { color: #34d399; font-family: var(--mono); font-size: 13px; padding-top: 2px; }
.step-line b { display: block; font-size: 15px; }
.step-line span { display: block; color: rgba(255, 255, 255, 0.5); font-size: 13.5px; margin-top: 2px; }

.cta {
  position: relative;
  overflow: hidden;
  border-radius: 28px;
  border: 1px solid rgba(16, 185, 129, 0.2);
  padding: 72px 32px;
  text-align: center;
  background:
    radial-gradient(ellipse 60% 50% at 50% -10%, rgba(16, 185, 129, 0.18), transparent),
    radial-gradient(ellipse 40% 40% at 80% 90%, rgba(45, 212, 191, 0.1), transparent);
}
.cta h2 { font-size: clamp(30px, 4vw, 44px); max-width: 740px; margin: 16px auto 0; }
.cta .lede { max-width: 640px; margin: 14px auto 0; }
.cta .hero-actions { justify-content: center; }

.site-footer { border-top: 1px solid var(--line); padding: 48px 0 28px; }
.foot-grid { display: grid; grid-template-columns: 1.5fr 1fr 1fr; gap: 28px; }
.end-note { padding-top: 12px; }
.end-note h2 { font-size: clamp(28px, 3vw, 40px); max-width: 16em; }
.end-note .lede { margin: 12px 0 22px; max-width: 36em; }
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.steps article { padding: 22px; }
.steps .n { color: var(--emerald-text); font-size: 13px; font-weight: 700; }
.foot-title { font-size: 13px; font-weight: 700; color: var(--faint); margin-bottom: 14px; }
.foot-grid a, .foot-grid p { color: var(--muted); font-size: 14px; }
.foot-grid .col { display: flex; flex-direction: column; gap: 10px; }
.foot-grid a:hover { color: var(--text); }
.legal-line {
  margin-top: 28px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
  display: flex;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  color: var(--faint);
  font-size: 13px;
}

.page-hero { padding: 64px 0 12px; }
.page-hero .lede { max-width: 680px; margin-top: 16px; }
.crumbs { color: var(--faint); font-size: 13px; margin-bottom: 18px; }
.crumbs a:hover { color: var(--text); }

.feature-block { display: block; padding: 28px; margin-bottom: 16px; }
.feature-block .lede { max-width: 760px; }
.feature-block .checks { margin-top: 20px; }
.feature-block h2 { font-size: 28px; margin: 8px 0 10px; }
.checks { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: 1fr 1fr; gap: 10px 16px; }
.checks li { display: flex; gap: 8px; align-items: flex-start; color: var(--muted); font-size: 14.5px; }
.checks svg { margin-top: 3px; color: var(--emerald); flex: none; }

.table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: 16px; }
table { width: 100%; border-collapse: collapse; min-width: 720px; font-size: 14px; }
th, td { text-align: left; padding: 14px 16px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { color: var(--faint); font-weight: 650; background: var(--soft); }
tr:last-child td { border-bottom: 0; }
td:first-child { font-weight: 650; white-space: nowrap; }

.flow { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 16px; }
.flow span {
  background: var(--chip);
  border-radius: 999px;
  padding: 6px 10px;
  font-size: 13px;
  color: var(--muted);
}
.flow i { color: var(--emerald-text); font-style: normal; align-self: center; }

.form-grid { display: grid; grid-template-columns: 1.15fr 0.85fr; gap: 22px; align-items: start; }
label { display: block; font-size: 13.5px; font-weight: 650; margin-bottom: 6px; }
.field { margin-bottom: 14px; }
input[type="text"], input[type="email"], input[type="tel"], select, textarea {
  width: 100%;
  border: 1px solid var(--line-strong);
  background: var(--bg);
  border-radius: 12px;
  padding: 12px 12px;
  outline: none;
}
html.dark input[type="text"],
html.dark input[type="email"],
html.dark input[type="tel"],
html.dark select,
html.dark textarea { background: #121216; }
textarea { min-height: 120px; resize: vertical; }
.help { min-height: 18px; color: var(--danger); font-size: 12.5px; margin-top: 4px; }
.choices { display: flex; flex-wrap: wrap; gap: 8px; }
.choices label {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-weight: 500;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 6px 10px;
  margin: 0;
  color: var(--muted);
}
.hp {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}
.form-card { padding: 22px; }
.aside-card { padding: 22px; }
.aside-card ol { margin: 10px 0 0; padding-left: 18px; color: var(--muted); }
.aside-card li + li { margin-top: 8px; }
.success {
  display: none;
  border: 1px solid var(--bubble-ai-line);
  background: var(--bubble-ai);
  border-radius: 16px;
  padding: 16px;
}
.success.show { display: block; }
.success pre {
  white-space: pre-wrap;
  font-family: var(--font);
  font-size: 13.5px;
  margin: 10px 0 0;
  color: var(--muted);
}

.faq details { padding: 0; }
.faq summary {
  cursor: pointer;
  padding: 16px 18px;
  font-weight: 650;
  list-style: none;
  display: flex;
  justify-content: space-between;
  gap: 12px;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; color: var(--emerald-text); font-weight: 500; }
.faq details[open] summary::after { content: "–"; }
.faq details p { padding: 0 18px 16px; color: var(--muted); font-size: 14.5px; }
.faq { display: flex; flex-direction: column; gap: 10px; }

.legal { max-width: 800px; }
.legal h2 { font-size: 22px; margin: 32px 0 8px; }
.legal p, .legal li { color: var(--muted); }
.legal ul { padding-left: 18px; }
.legal li + li { margin-top: 6px; }
.note {
  border-left: 3px solid var(--emerald);
  padding: 10px 14px;
  color: var(--muted);
  background: rgba(16, 185, 129, 0.06);
  border-radius: 0 12px 12px 0;
  margin-top: 18px;
}

.empty {
  min-height: 60vh;
  display: grid;
  place-items: center;
  text-align: center;
  padding: 80px 0;
}

@media (max-width: 980px) {
  .hero-grid, .split, .feature-block, .form-grid, .foot-grid, .steps { grid-template-columns: 1fr; }
  .grid-4 { grid-template-columns: 1fr 1fr; }
  .grid-3 { grid-template-columns: 1fr; }
  .stats { grid-template-columns: 1fr 1fr; }
  .stat:nth-child(odd) { border-left: 0; }
  .stat:nth-child(3), .stat:nth-child(4) { border-top: 1px solid var(--line); }
  .stat + .stat { border-left: 0; }
  .stat:nth-child(even) { border-left: 1px solid var(--line); }
  .nav-desktop, .header-actions .btn { display: none; }
  .nav-toggle { display: inline-grid; }
  .checks { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
  .container { width: min(1152px, calc(100% - 32px)); }
  .section { padding: 64px 0; }
  .hero { padding-top: 40px; }
  .grid-2, .grid-4, .stats, .id-detail { grid-template-columns: 1fr; }
  .stat:nth-child(even) { border-left: 0; }
  .stat + .stat { border-top: 1px solid var(--line); }
  .cta { padding: 48px 18px; }
  .layers li { grid-template-columns: 48px 1fr; padding: 16px; }
  .scene-tabs { flex-direction: column; }
}

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