:root {
  color-scheme: dark;
  --bg: #060a0f;
  --bg-soft: #0a1018;
  --surface: #0d151f;
  --surface-2: #111d29;
  --surface-3: #162534;
  --line: rgba(164, 190, 211, 0.16);
  --line-strong: rgba(91, 221, 235, 0.34);
  --text: #f4f8fb;
  --muted: #9fb0bf;
  --muted-2: #7f93a4;
  --accent: #5bddeb;
  --accent-2: #69a8ff;
  --accent-soft: rgba(91, 221, 235, 0.11);
  --success: #6de0a8;
  --warning: #f2c66d;
  --danger: #ff8793;
  --max: 1200px;
  --header-h: 76px;
  --radius-sm: 10px;
  --radius-md: 18px;
  --radius-lg: 28px;
  --shadow: 0 24px 80px rgba(0, 0, 0, 0.32);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 34px);
}

body {
  margin: 0;
  min-width: 320px;
  background:
    radial-gradient(circle at 80% -10%, rgba(68, 169, 199, 0.13), transparent 34rem),
    radial-gradient(circle at 0% 35%, rgba(72, 103, 180, 0.08), transparent 28rem),
    var(--bg);
  color: var(--text);
  font-family: Inter, "Noto Sans SC", "Microsoft YaHei", system-ui, sans-serif;
  line-height: 1.65;
  text-rendering: optimizeLegibility;
}

body::before {
  position: fixed;
  inset: 0;
  z-index: -2;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.018) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.018) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: linear-gradient(to bottom, #000, transparent 76%);
  content: "";
  pointer-events: none;
}

a {
  color: inherit;
  text-decoration: none;
}

button,
a {
  -webkit-tap-highlight-color: transparent;
}

button,
input,
textarea,
select {
  font: inherit;
}

img,
svg {
  display: block;
  max-width: 100%;
}

:focus-visible {
  outline: 3px solid rgba(91, 221, 235, 0.86);
  outline-offset: 4px;
}

.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 100;
  padding: 10px 14px;
  border-radius: 8px;
  background: var(--text);
  color: var(--bg);
  transform: translateY(-150%);
}

.skip-link:focus {
  transform: translateY(0);
}

.shell {
  width: min(calc(100% - 40px), var(--max));
  margin-inline: auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  height: var(--header-h);
  border-bottom: 1px solid transparent;
  background: rgba(6, 10, 15, 0.76);
  backdrop-filter: blur(18px);
  transition: border-color 180ms ease, background 180ms ease;
}

.site-header.is-scrolled {
  border-color: var(--line);
  background: rgba(6, 10, 15, 0.94);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  flex: 0 0 auto;
  font-weight: 740;
  letter-spacing: -0.03em;
}

.brand-mark {
  width: 34px;
  height: 34px;
}

.brand-word {
  font-size: 1.2rem;
}

.brand-word small {
  margin-left: 8px;
  color: var(--muted);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.08em;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-left: auto;
}

.main-nav a {
  padding: 10px 11px;
  border-radius: 9px;
  color: var(--muted);
  font-size: 0.9rem;
  transition: color 160ms ease, background 160ms ease;
}

.main-nav a:hover,
.main-nav a[aria-current="page"] {
  background: rgba(255, 255, 255, 0.045);
  color: var(--text);
}

.header-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: 0 17px;
  border: 1px solid var(--line-strong);
  border-radius: 10px;
  background: var(--accent-soft);
  color: #dcfbff;
  font-size: 0.9rem;
  font-weight: 700;
  white-space: nowrap;
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--surface);
  color: var(--text);
}

.nav-toggle span,
.nav-toggle::before,
.nav-toggle::after {
  display: block;
  width: 18px;
  height: 1.5px;
  margin: 4px auto;
  background: currentColor;
  content: "";
}

.hero {
  position: relative;
  padding: 88px 0 76px;
  overflow: hidden;
}

.hero::after {
  position: absolute;
  top: 8%;
  right: -10%;
  z-index: -1;
  width: 560px;
  height: 560px;
  border: 1px solid rgba(91, 221, 235, 0.1);
  border-radius: 50%;
  background: radial-gradient(circle, rgba(91, 221, 235, 0.06), transparent 62%);
  content: "";
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.08fr) minmax(430px, 0.92fr);
  align-items: center;
  gap: clamp(50px, 7vw, 100px);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 18px;
  color: var(--accent);
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.17em;
  text-transform: uppercase;
}

.eyebrow::before {
  width: 26px;
  height: 1px;
  background: currentColor;
  content: "";
}

.hero h1,
.page-hero h1 {
  max-width: 800px;
  margin: 0;
  font-size: clamp(2.7rem, 5.5vw, 5.4rem);
  line-height: 1.06;
  letter-spacing: -0.065em;
}

.hero h1 .accent,
.page-hero h1 .accent {
  color: var(--accent);
}

.lead {
  max-width: 690px;
  margin: 28px 0 0;
  color: #c4d0da;
  font-size: clamp(1.03rem, 1.7vw, 1.2rem);
  line-height: 1.8;
}

.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.tag-row li,
.pill {
  padding: 7px 11px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.025);
  color: var(--muted);
  font-size: 0.8rem;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 34px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 20px;
  border: 1px solid transparent;
  border-radius: 11px;
  font-weight: 720;
  transition: transform 160ms ease, border-color 160ms ease, background 160ms ease;
}

.button:hover {
  transform: translateY(-2px);
}

.button-primary {
  background: var(--accent);
  color: #051014;
}

.button-secondary {
  border-color: var(--line);
  background: rgba(255, 255, 255, 0.035);
  color: var(--text);
}

.button-arrow::after {
  margin-left: 10px;
  content: "↗";
}

.audience-note {
  margin-top: 24px;
  color: var(--muted-2);
  font-size: 0.86rem;
}

.stack-visual {
  position: relative;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background:
    linear-gradient(145deg, rgba(91, 221, 235, 0.07), transparent 35%),
    rgba(9, 16, 24, 0.82);
  box-shadow: var(--shadow);
}

.stack-visual::before {
  position: absolute;
  inset: 12px;
  border: 1px solid rgba(255, 255, 255, 0.035);
  border-radius: 20px;
  content: "";
  pointer-events: none;
}

.stack-topline {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
  color: var(--muted-2);
  font-family: Consolas, monospace;
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.stack-control,
.stack-layer {
  display: grid;
  grid-template-columns: 54px 1fr auto;
  align-items: center;
  gap: 12px;
  min-height: 66px;
  padding: 12px 16px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.022);
  transition: border-color 160ms ease, background 160ms ease, opacity 160ms ease;
}

.stack-control {
  margin-bottom: 12px;
  border-color: var(--line-strong);
  background: var(--accent-soft);
}

.stack-layers {
  display: grid;
  gap: 8px;
}

.stack-layer:hover,
.stack-layer.is-active,
.stack-layer:focus-visible {
  border-color: rgba(91, 221, 235, 0.48);
  background: rgba(91, 221, 235, 0.07);
}

.stack-layer.is-muted {
  opacity: 0.35;
}

.layer-code {
  color: var(--accent);
  font-family: Consolas, monospace;
  font-size: 0.82rem;
}

.stack-layer strong,
.stack-control strong {
  display: block;
  font-size: 0.94rem;
}

.stack-layer small,
.stack-control small {
  display: block;
  margin-top: 2px;
  color: var(--muted-2);
  font-size: 0.72rem;
}

.layer-state {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--muted-2);
  box-shadow: 0 0 0 4px rgba(127, 147, 164, 0.08);
}

.stack-control .layer-state,
.stack-layer.is-active .layer-state {
  background: var(--accent);
  box-shadow: 0 0 0 4px rgba(91, 221, 235, 0.1), 0 0 18px rgba(91, 221, 235, 0.5);
}

.metric-band {
  border-block: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.018);
}

.metric-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
}

.metric {
  min-height: 148px;
  padding: 28px 30px;
  border-right: 1px solid var(--line);
}

.metric:last-child {
  border-right: 0;
}

.metric strong {
  display: block;
  color: var(--accent);
  font-family: Consolas, monospace;
  font-size: 2.15rem;
  line-height: 1;
}

.metric span {
  display: block;
  margin-top: 12px;
  font-weight: 700;
}

.metric small {
  display: block;
  margin-top: 3px;
  color: var(--muted-2);
  font-size: 0.76rem;
  line-height: 1.5;
}

.section {
  padding: 104px 0;
}

.section-compact {
  padding: 78px 0;
}

.section-alt {
  border-block: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.018), transparent);
}

.section-head {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(300px, 0.62fr);
  gap: 60px;
  align-items: end;
  margin-bottom: 46px;
}

.section-head h2 {
  margin: 0;
  font-size: clamp(2rem, 3.5vw, 3.45rem);
  line-height: 1.13;
  letter-spacing: -0.045em;
}

.section-head p {
  margin: 0;
  color: var(--muted);
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.scenario-card,
.product-card,
.evidence-card,
.mode-card,
.principle-card {
  position: relative;
  padding: 30px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: linear-gradient(145deg, rgba(255, 255, 255, 0.027), rgba(255, 255, 255, 0.012));
  overflow: hidden;
  transition: transform 180ms ease, border-color 180ms ease, background 180ms ease;
}

.scenario-card:hover,
.scenario-card:focus-within,
.product-card:hover,
.evidence-card:hover,
.mode-card:hover {
  border-color: var(--line-strong);
  background: linear-gradient(145deg, rgba(91, 221, 235, 0.055), rgba(255, 255, 255, 0.018));
  transform: translateY(-3px);
}

.card-number {
  position: absolute;
  top: 22px;
  right: 24px;
  color: rgba(255, 255, 255, 0.12);
  font-family: Consolas, monospace;
  font-size: 1.9rem;
}

.card-label {
  margin: 0 0 13px;
  color: var(--accent);
  font-family: Consolas, monospace;
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.scenario-card h3,
.product-card h3,
.evidence-card h3,
.mode-card h3,
.principle-card h3 {
  margin: 0;
  font-size: 1.3rem;
  line-height: 1.35;
}

.scenario-card p,
.product-card p,
.evidence-card p,
.mode-card p,
.principle-card p {
  margin: 14px 0 0;
  color: var(--muted);
}

.card-outcome {
  margin-top: 22px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
  color: #d8e4ec;
  font-weight: 650;
}

.layer-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  margin-top: 16px;
}

.layer-pills span {
  padding: 4px 8px;
  border-radius: 6px;
  background: rgba(91, 221, 235, 0.085);
  color: #a9f4fb;
  font-family: Consolas, monospace;
  font-size: 0.7rem;
}

.text-link {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  margin-top: 22px;
  color: var(--text);
  font-weight: 700;
}

.text-link::after {
  color: var(--accent);
  content: "→";
  transition: transform 160ms ease;
}

.text-link:hover::after {
  transform: translateX(4px);
}

.architecture-intro {
  display: grid;
  grid-template-columns: minmax(0, 0.88fr) minmax(420px, 1.12fr);
  gap: 64px;
  align-items: center;
}

.architecture-copy h2 {
  margin: 0;
  font-size: clamp(2.2rem, 4vw, 4rem);
  line-height: 1.12;
  letter-spacing: -0.052em;
}

.architecture-copy > p {
  margin: 24px 0 0;
  color: var(--muted);
  font-size: 1.04rem;
}

.product-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 12px;
}

.product-card {
  min-height: 310px;
  padding: 24px;
}

.product-card ul,
.evidence-card ul,
.layer-detail ul,
.contract-card ul {
  margin: 17px 0 0;
  padding: 0;
  list-style: none;
}

.product-card li,
.evidence-card li,
.layer-detail li,
.contract-card li {
  position: relative;
  margin-top: 8px;
  padding-left: 16px;
  color: var(--muted);
  font-size: 0.87rem;
}

.product-card li::before,
.evidence-card li::before,
.layer-detail li::before,
.contract-card li::before {
  position: absolute;
  left: 0;
  color: var(--accent);
  content: "·";
}

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

.evidence-card {
  min-height: 360px;
}

.status {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  margin-bottom: 18px;
  padding: 5px 9px;
  border-radius: 999px;
  background: rgba(242, 198, 109, 0.1);
  color: var(--warning);
  font-size: 0.72rem;
  font-weight: 700;
}

.status::before {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: currentColor;
  content: "";
}

.delivery-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  counter-reset: delivery;
}

.delivery-step {
  position: relative;
  padding: 30px 26px 26px;
  border-top: 1px solid var(--line-strong);
  counter-increment: delivery;
}

.delivery-step::before {
  position: absolute;
  top: -6px;
  left: 26px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 6px var(--bg), 0 0 22px rgba(91, 221, 235, 0.5);
  content: "";
}

.delivery-step small {
  color: var(--accent);
  font-family: Consolas, monospace;
}

.delivery-step h3 {
  margin: 12px 0 0;
}

.delivery-step p {
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.mode-grid,
.principle-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
}

.mode-card,
.principle-card {
  padding: 24px;
}

.faq-list {
  max-width: 900px;
  margin-inline: auto;
}

.faq-list details {
  border-bottom: 1px solid var(--line);
}

.faq-list summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  min-height: 78px;
  padding: 20px 2px;
  cursor: pointer;
  font-size: 1.02rem;
  font-weight: 700;
  list-style: none;
}

.faq-list summary::-webkit-details-marker {
  display: none;
}

.faq-list summary::after {
  color: var(--accent);
  font-family: Consolas, monospace;
  font-size: 1.35rem;
  content: "+";
}

.faq-list details[open] summary::after {
  content: "−";
}

.faq-list details p {
  max-width: 760px;
  margin: -3px 0 28px;
  color: var(--muted);
}

.final-cta {
  padding: 0 0 110px;
}

.cta-panel {
  position: relative;
  padding: clamp(40px, 7vw, 78px);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-lg);
  background:
    radial-gradient(circle at 85% 20%, rgba(91, 221, 235, 0.14), transparent 28rem),
    linear-gradient(145deg, #0c1721, #091018);
  overflow: hidden;
}

.cta-panel h2 {
  max-width: 800px;
  margin: 0;
  font-size: clamp(2rem, 4vw, 4.1rem);
  line-height: 1.12;
  letter-spacing: -0.05em;
}

.cta-panel p {
  max-width: 660px;
  margin: 22px 0 0;
  color: var(--muted);
}

.site-footer {
  padding: 52px 0 30px;
  border-top: 1px solid var(--line);
  background: #05080c;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr repeat(3, 1fr);
  gap: 40px;
}

.footer-intro p {
  max-width: 360px;
  margin: 20px 0 0;
  color: var(--muted-2);
  font-size: 0.88rem;
}

.footer-col h3 {
  margin: 0 0 16px;
  color: var(--muted-2);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.footer-col a {
  display: block;
  margin-top: 9px;
  color: var(--muted);
  font-size: 0.88rem;
}

.footer-col a:hover {
  color: var(--text);
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  margin-top: 46px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
  color: var(--muted-2);
  font-size: 0.76rem;
}

/* Architecture page */
.page-hero {
  padding: 90px 0 74px;
}

.page-hero .lead {
  max-width: 850px;
}

.definition-note {
  display: inline-flex;
  margin-top: 28px;
  padding: 10px 13px;
  border: 1px solid var(--line);
  border-radius: 9px;
  background: rgba(255, 255, 255, 0.025);
  color: var(--muted);
  font-size: 0.84rem;
}

.subnav {
  position: sticky;
  top: var(--header-h);
  z-index: 35;
  border-block: 1px solid var(--line);
  background: rgba(6, 10, 15, 0.92);
  backdrop-filter: blur(16px);
}

.subnav-inner {
  display: flex;
  gap: 7px;
  overflow-x: auto;
  scrollbar-width: none;
}

.subnav-inner::-webkit-scrollbar {
  display: none;
}

.subnav a {
  flex: 0 0 auto;
  padding: 15px 14px;
  color: var(--muted);
  font-size: 0.82rem;
}

.subnav a:hover,
.subnav a.is-active {
  color: var(--accent);
}

.filter-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 24px;
}

.filter-button {
  min-height: 38px;
  padding: 0 13px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
}

.filter-button:hover,
.filter-button[aria-pressed="true"] {
  border-color: var(--line-strong);
  background: var(--accent-soft);
  color: var(--text);
}

.explorer {
  display: grid;
  grid-template-columns: minmax(320px, 0.39fr) minmax(0, 0.61fr);
  min-height: 740px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: rgba(7, 13, 20, 0.74);
  overflow: hidden;
  box-shadow: var(--shadow);
}

.explorer-nav {
  padding: 24px;
  border-right: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.014);
}

.layer-button {
  display: grid;
  grid-template-columns: 46px 1fr;
  gap: 11px;
  width: 100%;
  margin-top: 8px;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 11px;
  background: transparent;
  color: var(--text);
  text-align: left;
  cursor: pointer;
  transition: opacity 160ms ease, border-color 160ms ease, background 160ms ease;
}

.layer-button:first-of-type {
  margin-top: 0;
}

.layer-button[data-role="control-plane"] {
  border-color: rgba(91, 221, 235, 0.28);
}

.layer-button:hover,
.layer-button[aria-selected="true"] {
  border-color: var(--line-strong);
  background: var(--accent-soft);
}

.layer-button.is-muted {
  opacity: 0.35;
}

.layer-button .layer-code {
  padding-top: 1px;
}

.layer-button strong {
  display: block;
  font-size: 0.92rem;
}

.layer-button small {
  display: block;
  margin-top: 3px;
  color: var(--muted-2);
  font-size: 0.72rem;
}

.explorer-content {
  padding: clamp(30px, 5vw, 58px);
}

.layer-detail[hidden] {
  display: none;
}

.detail-topline {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 22px;
}

.detail-topline .layer-code {
  font-size: 0.92rem;
}

.detail-type {
  color: var(--muted-2);
  font-family: Consolas, monospace;
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.layer-detail h3 {
  margin: 0;
  font-size: clamp(1.9rem, 3.2vw, 3rem);
  line-height: 1.16;
  letter-spacing: -0.04em;
}

.detail-summary {
  margin: 18px 0 0;
  color: #c5d1da;
  font-size: 1.05rem;
}

.detail-question {
  margin: 26px 0 0;
  padding: 18px 20px;
  border-left: 2px solid var(--accent);
  background: rgba(91, 221, 235, 0.05);
  color: #d8e8ed;
}

.detail-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 22px;
  margin-top: 32px;
}

.detail-block {
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

.detail-block h4 {
  margin: 0;
  color: var(--muted-2);
  font-family: Consolas, monospace;
  font-size: 0.72rem;
  letter-spacing: 0.11em;
  text-transform: uppercase;
}

.gate-callout {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-top: 30px;
  padding: 18px;
  border: 1px solid var(--line-strong);
  border-radius: 12px;
  background: var(--accent-soft);
}

.gate-callout strong {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  flex: 0 0 auto;
  border-radius: 9px;
  background: var(--accent);
  color: #061014;
  font-family: Consolas, monospace;
}

.gate-callout span {
  color: #d7e9ed;
}

.contract-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 10px;
}

.contract-card {
  min-height: 290px;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.018);
}

.contract-arrow {
  color: var(--accent);
  font-family: Consolas, monospace;
  font-size: 0.78rem;
}

.contract-card h3 {
  margin: 15px 0 0;
  font-size: 1rem;
}

.gate-table-wrap {
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
}

.gate-table {
  width: 100%;
  min-width: 860px;
  border-collapse: collapse;
}

.gate-table th,
.gate-table td {
  padding: 19px 20px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

.gate-table th {
  background: rgba(255, 255, 255, 0.025);
  color: var(--muted-2);
  font-family: Consolas, monospace;
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.gate-table td {
  color: var(--muted);
  font-size: 0.88rem;
}

.gate-table tr:last-child td {
  border-bottom: 0;
}

.gate-id {
  color: var(--accent);
  font-family: Consolas, monospace;
  font-weight: 800;
}

.path-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
}

.path-card {
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.018);
}

.path-card h3 {
  margin: 0;
}

.path-flow {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 20px;
}

.path-flow span {
  padding: 7px 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--muted);
  font-family: Consolas, monospace;
  font-size: 0.78rem;
}

.path-flow i {
  color: var(--accent);
  font-style: normal;
}

.path-card p {
  margin: 16px 0 0;
  color: var(--muted);
}

@media (max-width: 1100px) {
  .main-nav a {
    padding-inline: 8px;
    font-size: 0.82rem;
  }

  .hero-grid,
  .architecture-intro {
    grid-template-columns: 1fr;
  }

  .hero-copy {
    max-width: 800px;
  }

  .stack-visual {
    max-width: 720px;
  }

  .product-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .product-card:nth-child(n + 4) {
    min-height: 250px;
  }

  .contract-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 860px) {
  :root {
    --header-h: 68px;
  }

  .main-nav,
  .header-cta {
    display: none;
  }

  .nav-toggle {
    display: block;
    margin-left: auto;
  }

  .main-nav.is-open {
    position: fixed;
    top: var(--header-h);
    right: 0;
    left: 0;
    display: grid;
    gap: 4px;
    max-height: calc(100vh - var(--header-h));
    padding: 16px 20px 24px;
    border-bottom: 1px solid var(--line);
    background: #080d13;
    overflow-y: auto;
  }

  .main-nav.is-open a {
    min-height: 48px;
    padding: 13px 12px;
    font-size: 0.96rem;
  }

  .main-nav.is-open .mobile-cta {
    margin-top: 8px;
    border: 1px solid var(--line-strong);
    background: var(--accent-soft);
    color: var(--text);
  }

  .hero {
    padding-top: 64px;
  }

  .hero-grid {
    gap: 48px;
  }

  .metric-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .metric:nth-child(2) {
    border-right: 0;
  }

  .metric:nth-child(-n + 2) {
    border-bottom: 1px solid var(--line);
  }

  .section {
    padding: 80px 0;
  }

  .section-head {
    grid-template-columns: 1fr;
    gap: 18px;
  }

  .evidence-grid,
  .mode-grid,
  .principle-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .delivery-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 24px 0;
  }

  .explorer {
    grid-template-columns: 1fr;
  }

  .explorer-nav {
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .layer-button {
    display: inline-grid;
    width: calc(50% - 6px);
    margin-right: 6px;
    vertical-align: top;
  }

  .contract-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 640px) {
  .shell {
    width: min(calc(100% - 28px), var(--max));
  }

  .brand-word small {
    display: none;
  }

  .hero,
  .page-hero {
    padding: 52px 0 58px;
  }

  .hero h1,
  .page-hero h1 {
    font-size: clamp(2.5rem, 13vw, 4rem);
  }

  .lead {
    margin-top: 21px;
    font-size: 1rem;
  }

  .actions {
    display: grid;
  }

  .button {
    width: 100%;
  }

  .stack-visual {
    padding: 14px;
    border-radius: 20px;
  }

  .stack-control,
  .stack-layer {
    grid-template-columns: 38px 1fr auto;
    padding: 11px 12px;
  }

  .metric {
    min-height: 130px;
    padding: 22px 18px;
  }

  .metric strong {
    font-size: 1.75rem;
  }

  .section {
    padding: 68px 0;
  }

  .section-head {
    margin-bottom: 30px;
  }

  .card-grid,
  .product-grid,
  .evidence-grid,
  .mode-grid,
  .principle-grid,
  .path-grid,
  .contract-grid {
    grid-template-columns: 1fr;
  }

  .scenario-card,
  .product-card,
  .evidence-card,
  .mode-card,
  .principle-card {
    min-height: auto;
    padding: 24px;
  }

  .delivery-grid {
    grid-template-columns: 1fr;
  }

  .delivery-step {
    margin-left: 6px;
    padding: 25px 18px 24px 28px;
    border-top: 0;
    border-left: 1px solid var(--line-strong);
  }

  .delivery-step::before {
    top: 30px;
    left: -6px;
  }

  .footer-grid {
    grid-template-columns: 1fr;
  }

  .footer-bottom {
    display: grid;
  }

  .subnav-inner {
    width: calc(100% + 14px);
  }

  .explorer {
    min-height: 0;
    border-radius: 18px;
  }

  .explorer-nav,
  .explorer-content {
    padding: 16px;
  }

  .layer-button {
    width: 100%;
    margin-right: 0;
  }

  .detail-grid {
    grid-template-columns: 1fr;
  }

  .detail-topline {
    align-items: flex-start;
  }
}

/* Secondary pages share the same surfaces as the homepage. */
.page-intro { padding: 72px 0 8px; }
.page-intro h1 { max-width: 16em; margin: 0; font-size: clamp(2.15rem, 4.4vw, 3.6rem); line-height: 1.12; letter-spacing: -0.04em; }
.page-intro .lead { margin-top: 18px; }
.plane-row { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 14px; }
.plane, .sku-item, .mode-item, .gate-item, .contact-box {
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.02);
}
.plane, .contact-box { padding: 22px; }
.plane .tag, .sku-item .id, .mode-item .id, .gate-item .id { color: var(--accent); font-family: Consolas, monospace; font-size: 0.78rem; }
.plane h2, .sku-item h2, .mode-item h2, .gate-item h2 { margin: 8px 0; font-size: 1.25rem; letter-spacing: -0.03em; }
.plane p, .sku-item p, .mode-item p, .gate-item p, .prose p, .prose li { color: var(--muted); }
.sku-list, .mode-list, .gate-list { display: grid; gap: 12px; }
.sku-item, .mode-item, .gate-item { display: grid; grid-template-columns: 4.2rem 1fr; gap: 8px 16px; padding: 22px; }
.flow { margin: 0; padding: 18px 20px; overflow-x: auto; border-left: 2px solid var(--accent); background: rgba(91, 221, 235, 0.05); color: var(--muted); font-family: Consolas, monospace; font-size: 0.82rem; line-height: 1.7; white-space: pre; }
.prose { max-width: 46rem; }
.prose h2 { margin: 2rem 0 0.75rem; font-size: 1.45rem; letter-spacing: -0.03em; }
.table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: var(--radius-md); }
.table-wrap table { width: 100%; min-width: 640px; border-collapse: collapse; }
.table-wrap th, .table-wrap td { padding: 14px 16px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
.table-wrap th { color: var(--muted-2); font-family: Consolas, monospace; font-size: 0.72rem; letter-spacing: 0.08em; text-transform: uppercase; }
.table-wrap td { color: var(--muted); }
.contact-box a.mail { color: var(--accent); font-size: 1.35rem; }
.cta-row, .actions { display: flex; flex-wrap: wrap; gap: 12px; }
.cta-row { margin-top: 28px; }
.btn { display: inline-flex; align-items: center; justify-content: center; min-height: 48px; padding: 0 18px; border: 1px solid transparent; border-radius: 11px; font-weight: 700; }
.btn-primary { background: var(--accent); color: #061014; }
.btn-ghost { border-color: var(--line); background: rgba(255, 255, 255, 0.03); color: var(--text); }
.hash-anchor { position: relative; top: -120px; }
@media (max-width: 800px) {
  .plane-row, .sku-item, .mode-item, .gate-item { grid-template-columns: 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.001ms !important;
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
  }
}