:root {
  color-scheme: dark;
  --bg: #070a12;
  --bg-deep: #04060b;
  --surface: #0b101d;
  --surface-strong: #10172a;
  --text: #f2f5f7;
  --muted: #8e99ad;
  --dim: #78849a;
  --border: rgba(159, 178, 215, 0.17);
  --border-strong: rgba(159, 209, 255, 0.3);
  --cyan: #63e6ff;
  --blue: #7c8cff;
  --violet: #ad6cff;
  --amber: #ffbd69;
  --danger: #ff7f8f;
  --green: #72f0ba;
  --max: 1140px;
  --mono: "IBM Plex Mono", ui-monospace, monospace;
  --sans: "Manrope", "Hiragino Sans", sans-serif;
}

* {
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
  background: var(--bg);
}
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  line-height: 1.6;
  overflow-x: hidden;
}
a {
  color: inherit;
  text-decoration: none;
}
button {
  font: inherit;
}
::selection {
  background: rgba(99, 230, 255, 0.24);
  color: #fff;
}

[data-lang="ja"] {
  display: none;
}
html[data-language="ja"] [data-lang="en"] {
  display: none;
}
html[data-language="ja"] [data-lang="ja"] {
  display: inline;
}
html[data-language="ja"] h1 [data-lang="ja"],
html[data-language="ja"] h2[data-lang="ja"],
html[data-language="ja"] p[data-lang="ja"] {
  display: block;
}

.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 200;
  padding: 10px 14px;
  background: var(--text);
  color: var(--bg);
  transform: translateY(-160%);
  transition: transform 160ms ease;
}
.skip-link:focus {
  transform: translateY(0);
}

.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 100;
  height: 72px;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  padding: 0 max(24px, calc((100vw - var(--max)) / 2));
  border-bottom: 1px solid transparent;
  transition:
    background 180ms ease,
    border-color 180ms ease,
    backdrop-filter 180ms ease;
}
.site-header.is-scrolled {
  background: rgba(7, 10, 18, 0.82);
  border-color: var(--border);
  backdrop-filter: blur(18px);
}
.wordmark {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  width: max-content;
  font-weight: 800;
  letter-spacing: -0.03em;
}
.mark {
  width: 32px;
  height: 32px;
}
.main-nav {
  display: flex;
  align-items: center;
  gap: 30px;
  font: 500 12px/1 var(--mono);
  color: var(--muted);
}
.main-nav a,
.site-footer a,
.text-link {
  transition: color 150ms ease;
}
.main-nav a:hover,
.main-nav a:focus-visible,
.site-footer a:hover,
.site-footer a:focus-visible,
.text-link:hover,
.text-link:focus-visible {
  color: var(--cyan);
}
.header-actions {
  justify-self: end;
  display: flex;
  align-items: center;
  gap: 12px;
}
.language-switch {
  display: flex;
  padding: 3px;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.025);
}
.language-switch button {
  border: 0;
  padding: 6px 8px;
  color: var(--dim);
  background: transparent;
  font: 600 10px/1 var(--mono);
  cursor: pointer;
}
.language-switch button[aria-pressed="true"] {
  color: var(--text);
  background: var(--surface-strong);
}

.button {
  min-height: 46px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 20px;
  border: 1px solid var(--border-strong);
  background: rgba(255, 255, 255, 0.025);
  color: var(--text);
  font: 600 12px/1 var(--mono);
  letter-spacing: 0.01em;
  transition:
    transform 150ms ease,
    border-color 150ms ease,
    background 150ms ease;
}
.button:hover,
.button:focus-visible {
  transform: translateY(-2px);
  border-color: var(--cyan);
  background: rgba(99, 230, 255, 0.06);
}
.button-primary {
  background: var(--text);
  border-color: var(--text);
  color: var(--bg);
}
.button-primary:hover,
.button-primary:focus-visible {
  background: var(--cyan);
  border-color: var(--cyan);
  color: #031014;
}
.button-small {
  min-height: 34px;
  padding: 0 14px;
  font-size: 11px;
}

.hero {
  position: relative;
  min-height: 100svh;
  padding: 150px 24px 0;
  text-align: center;
  overflow: hidden;
  border-bottom: 1px solid var(--border);
}
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0.13;
  background-image:
    linear-gradient(rgba(145, 174, 220, 0.12) 1px, transparent 1px),
    linear-gradient(90deg, rgba(145, 174, 220, 0.12) 1px, transparent 1px);
  background-size: 56px 56px;
}
.hero-glow {
  position: absolute;
  top: -340px;
  left: 50%;
  width: 1000px;
  height: 760px;
  transform: translateX(-50%);
  border-radius: 50%;
  background: radial-gradient(
    circle,
    rgba(99, 230, 255, 0.12),
    rgba(124, 140, 255, 0.08) 34%,
    transparent 68%
  );
  filter: blur(20px);
  pointer-events: none;
}
.eyebrow {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 7px 10px;
  border: 1px solid var(--border);
  color: var(--muted);
  font: 500 11px/1 var(--mono);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}
.status-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 13px var(--green);
}
.hero h1 {
  position: relative;
  max-width: 980px;
  margin: 34px auto 22px;
  font-size: clamp(46px, 7.2vw, 94px);
  line-height: 0.98;
  letter-spacing: -0.068em;
  font-weight: 800;
}
.hero h1 em {
  font-style: normal;
  color: transparent;
  background: linear-gradient(90deg, var(--cyan), #95adff 48%, var(--violet));
  background-clip: text;
  -webkit-background-clip: text;
}
.hero-lead {
  position: relative;
  max-width: 700px;
  margin: 0 auto;
  color: var(--muted);
  font-size: clamp(16px, 2vw, 19px);
}
.hero-actions {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: stretch;
  gap: 10px;
  margin: 34px auto 0;
}
.install-command {
  min-height: 46px;
  display: flex;
  align-items: center;
  gap: 10px;
  padding-left: 14px;
  border: 1px solid var(--border-strong);
  background: rgba(4, 8, 15, 0.72);
  text-align: left;
}
.install-command .prompt {
  color: var(--cyan);
  font: 600 13px/1 var(--mono);
}
.install-command code {
  white-space: nowrap;
  font: 500 12px/1 var(--mono);
}
.copy-button {
  align-self: stretch;
  min-width: 68px;
  border: 0;
  border-left: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.035);
  color: var(--muted);
  font: 500 10px/1 var(--mono);
  cursor: pointer;
}
.copy-button:hover,
.copy-button:focus-visible,
.copy-button.copied {
  color: var(--cyan);
  background: rgba(99, 230, 255, 0.08);
}

.router-stage {
  position: relative;
  width: min(940px, calc(100vw - 40px));
  height: 410px;
  margin: 62px auto 0;
  border: 1px solid var(--border);
  background: linear-gradient(
    180deg,
    rgba(12, 18, 34, 0.7),
    rgba(5, 8, 15, 0.95)
  );
  overflow: hidden;
}
.router-stage::before {
  content: "LIVE ROUTE TRACE";
  position: absolute;
  top: 15px;
  left: 18px;
  color: var(--dim);
  font: 500 9px/1 var(--mono);
  letter-spacing: 0.12em;
}
.orbit {
  position: absolute;
  left: 50%;
  top: 49%;
  border: 1px solid rgba(99, 230, 255, 0.11);
  border-radius: 50%;
  transform: translate(-50%, -50%);
}
.orbit-one {
  width: 270px;
  height: 270px;
}
.orbit-two {
  width: 380px;
  height: 380px;
  border-color: rgba(173, 108, 255, 0.08);
}
.route-lines {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}
.route-lines path {
  fill: none;
  stroke: rgba(124, 140, 255, 0.28);
  stroke-width: 1.4;
  stroke-dasharray: 5 8;
}
.route-lines .selected-line {
  stroke: var(--cyan);
  stroke-width: 2;
  stroke-dasharray: 8 8;
  animation: route-dash 5s linear infinite;
  filter: drop-shadow(0 0 5px rgba(99, 230, 255, 0.8));
}
.candidate {
  position: absolute;
  z-index: 2;
  width: 126px;
  display: grid;
  grid-template-columns: auto 1fr;
  column-gap: 9px;
  align-items: center;
  padding: 12px;
  border: 1px solid var(--border);
  background: #0a0f1c;
  text-align: left;
}
.candidate > span {
  grid-row: span 2;
  display: grid;
  place-items: center;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: rgba(99, 230, 255, 0.08);
  color: var(--cyan);
  font: 600 9px/1 var(--mono);
}
.candidate strong {
  font: 600 12px/1.2 var(--mono);
}
.candidate small {
  color: var(--dim);
  font: 400 9px/1.2 var(--mono);
}
.candidate-a {
  left: 8%;
  top: 15%;
}
.candidate-b {
  left: 8%;
  bottom: 15%;
}
.candidate-c {
  right: 8%;
  top: 15%;
}
.gate {
  position: absolute;
  z-index: 2;
  left: 50%;
  top: 49%;
  width: 180px;
  transform: translate(-50%, -50%);
  display: grid;
  justify-items: center;
}
.gate-ring {
  width: 106px;
  height: 106px;
  border: 1px solid rgba(99, 230, 255, 0.4);
  border-radius: 50%;
  box-shadow:
    inset 0 0 32px rgba(99, 230, 255, 0.05),
    0 0 38px rgba(124, 140, 255, 0.08);
  animation: gate-pulse 3.2s ease-in-out infinite;
}
.gate-core {
  position: absolute;
  top: 41px;
  width: 24px;
  height: 24px;
  border: 6px solid var(--cyan);
  border-radius: 50%;
  box-shadow: 0 0 18px rgba(99, 230, 255, 0.5);
}
.gate strong {
  margin-top: 14px;
  font: 600 12px/1 var(--mono);
}
.gate small {
  margin-top: 7px;
  color: var(--dim);
  font: 400 9px/1 var(--mono);
}
.result {
  position: absolute;
  right: 8%;
  bottom: 15%;
  z-index: 2;
  width: 148px;
  display: grid;
  grid-template-columns: auto 1fr;
  column-gap: 9px;
  align-items: center;
  padding: 13px;
  border: 1px solid rgba(114, 240, 186, 0.3);
  background: rgba(10, 22, 23, 0.92);
  text-align: left;
}
.result-check {
  grid-row: span 2;
  display: grid;
  place-items: center;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  color: #04110d;
  background: var(--green);
  font-weight: 800;
}
.result strong {
  font: 600 11px/1.2 var(--mono);
}
.result small {
  color: #71ad94;
  font: 400 8px/1.2 var(--mono);
}
.proof-strip {
  position: relative;
  width: min(var(--max), calc(100vw - 48px));
  margin: 0 auto;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border: 1px solid var(--border);
  border-bottom: 0;
  list-style: none;
  text-align: left;
}
.proof-strip li {
  min-height: 88px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  padding: 18px 24px;
  border-right: 1px solid var(--border);
}
.proof-strip li:last-child {
  border-right: 0;
}
.proof-strip strong {
  font: 600 12px/1 var(--mono);
}
.proof-strip span {
  color: var(--dim);
  font-size: 12px;
}

.section {
  width: min(var(--max), calc(100vw - 48px));
  margin: 0 auto;
  padding: 128px 0;
  border-bottom: 1px solid var(--border);
}
.section-heading {
  max-width: 760px;
  margin-bottom: 56px;
}
.section-index {
  margin: 0 0 22px;
  color: var(--cyan);
  font: 600 10px/1 var(--mono);
  letter-spacing: 0.14em;
}
.section h2,
.cta-section h2 {
  margin: 0;
  font-size: clamp(36px, 5vw, 64px);
  line-height: 1.04;
  letter-spacing: -0.055em;
}
.section-heading > p:last-child,
.calibration-copy > p:not(.section-index),
.safety-section .section-heading > p:last-child {
  max-width: 680px;
  margin: 22px 0 0;
  color: var(--muted);
  font-size: 17px;
}
.flow-list {
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--border);
  list-style: none;
}
.flow-list li {
  display: grid;
  grid-template-columns: 70px minmax(0, 1fr) auto;
  gap: 22px;
  align-items: center;
  min-height: 150px;
  border-bottom: 1px solid var(--border);
}
.flow-number {
  color: var(--dim);
  font: 500 12px/1 var(--mono);
}
.flow-list h3 {
  margin: 0 0 7px;
  font-size: 21px;
  letter-spacing: -0.025em;
}
.flow-list p {
  max-width: 620px;
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}
.flow-list code,
.mode-row code {
  color: var(--cyan);
  font: 500 11px/1 var(--mono);
}

.modes-section {
  width: 100%;
  max-width: none;
  padding-left: max(24px, calc((100vw - var(--max)) / 2));
  padding-right: max(24px, calc((100vw - var(--max)) / 2));
  background: #090d17;
}
.mode-stack {
  border-top: 1px solid var(--border);
}
.mode-row {
  min-height: 126px;
  display: grid;
  grid-template-columns: 270px minmax(0, 1fr) 190px;
  align-items: center;
  gap: 30px;
  padding: 0 26px;
  border-bottom: 1px solid var(--border);
  transition: background 170ms ease, padding 170ms ease;
}
.mode-row:hover {
  padding-left: 34px;
  background: rgba(255, 255, 255, 0.02);
}
.mode-featured {
  background: linear-gradient(
    90deg,
    rgba(99, 230, 255, 0.055),
    transparent 70%
  );
  box-shadow: inset 3px 0 var(--cyan);
}
.mode-label {
  display: flex;
  align-items: center;
  gap: 20px;
}
.mode-label span {
  color: var(--dim);
  font: 500 10px/1 var(--mono);
}
.mode-label strong {
  font-size: 20px;
}
.mode-row p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}
.mode-row code {
  justify-self: end;
}

.calibration-section {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(420px, 1.1fr);
  gap: 90px;
  align-items: center;
}
.calibration-copy h2 {
  font-size: clamp(36px, 4.4vw, 58px);
}
.text-link {
  display: inline-flex;
  gap: 10px;
  margin-top: 30px;
  color: var(--text);
  font: 500 12px/1 var(--mono);
}
.hierarchy {
  padding: 32px;
  border: 1px solid var(--border);
  background: linear-gradient(
    145deg,
    rgba(16, 23, 42, 0.76),
    rgba(5, 8, 15, 0.96)
  );
}
.hierarchy-row {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 15px;
  align-items: center;
  min-height: 84px;
  padding: 16px 18px;
  border: 1px solid var(--border);
  background: rgba(5, 9, 17, 0.76);
}
.hierarchy-active {
  border-color: rgba(99, 230, 255, 0.42);
  box-shadow: inset 0 0 24px rgba(99, 230, 255, 0.035);
}
.scope-dot {
  width: 9px;
  height: 9px;
  border: 2px solid var(--dim);
  border-radius: 50%;
}
.hierarchy-active .scope-dot {
  border-color: var(--cyan);
  background: var(--cyan);
  box-shadow: 0 0 12px var(--cyan);
}
.hierarchy-row div {
  display: grid;
  gap: 4px;
}
.hierarchy-row strong {
  font: 600 12px/1 var(--mono);
}
.hierarchy-row small,
.sample {
  color: var(--dim);
  font: 400 10px/1.2 var(--mono);
}
.hierarchy-active .sample {
  color: var(--green);
}
.fallback-arrow {
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  color: var(--dim);
  font: 400 9px/1 var(--mono);
}
.fallback-arrow b {
  color: var(--blue);
}
.advisory-note {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  margin-top: 24px;
  padding-top: 22px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font: 400 11px/1.6 var(--mono);
}
.lock {
  color: var(--amber);
}

.demo-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}
.demo-card {
  position: relative;
  min-height: 410px;
  display: flex;
  flex-direction: column;
  border: 1px solid var(--border);
  background: var(--surface);
  overflow: hidden;
  transition: transform 180ms ease, border-color 180ms ease;
}
.demo-card:hover,
.demo-card:focus-visible {
  transform: translateY(-5px);
  border-color: var(--border-strong);
}
.demo-visual {
  height: 210px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-bottom: 1px solid var(--border);
  background-color: #070b14;
  background-image:
    radial-gradient(
    circle at 50% 50%,
    rgba(124, 140, 255, 0.13),
    transparent 45%
  ),
    linear-gradient(rgba(150, 180, 220, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(150, 180, 220, 0.06) 1px, transparent 1px);
  background-size: auto, 28px 28px, 28px 28px;
}
.demo-card > div:nth-child(2) {
  padding: 24px;
}
.demo-meta {
  color: var(--cyan);
  font: 500 9px/1 var(--mono);
  letter-spacing: 0.1em;
}
.demo-card h3 {
  margin: 12px 0 8px;
  font-size: 20px;
}
.demo-card p {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
}
.play {
  position: absolute;
  right: 20px;
  bottom: 20px;
  display: grid;
  place-items: center;
  width: 32px;
  height: 32px;
  border: 1px solid var(--border-strong);
  border-radius: 50%;
  color: var(--cyan);
  font-size: 9px;
}
.best-route-visual {
  gap: 8px;
}
.best-route-visual .mini-node {
  width: 22px;
  height: 22px;
  border: 1px solid var(--cyan);
  border-radius: 50%;
  box-shadow: 45px 0 25px rgba(99, 230, 255, 0.08);
}
.best-route-visual b {
  display: grid;
  place-items: center;
  width: 50px;
  height: 50px;
  margin-left: 14px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--cyan), var(--violet));
  color: #061019;
}
.chat-visual {
  gap: 28px;
}
.chat-visual span {
  display: grid;
  place-items: center;
  width: 64px;
  height: 64px;
  border: 1px solid var(--border-strong);
  border-radius: 50%;
  color: var(--cyan);
  font: 600 18px/1 var(--mono);
}
.chat-visual span:last-child {
  color: var(--violet);
}
.chat-visual i {
  color: var(--muted);
  font-style: normal;
}
.hierarchy-visual {
  flex-direction: column;
  gap: 13px;
}
.hierarchy-visual span {
  width: 150px;
  height: 15px;
  border: 1px solid var(--border-strong);
}
.hierarchy-visual span:nth-child(1) {
  width: 82px;
  border-color: var(--cyan);
  box-shadow: 0 0 15px rgba(99, 230, 255, 0.12);
}
.hierarchy-visual span:nth-child(2) {
  width: 116px;
}

.safety-section {
  width: 100%;
  max-width: none;
  padding-left: max(24px, calc((100vw - var(--max)) / 2));
  padding-right: max(24px, calc((100vw - var(--max)) / 2));
  background: #090d17;
}
.safety-layout {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 46px;
  align-items: start;
}
.terminal {
  border: 1px solid var(--border-strong);
  background: #050810;
  box-shadow: 0 28px 80px rgba(0, 0, 0, 0.3);
}
.terminal-bar {
  height: 42px;
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 0 14px;
  border-bottom: 1px solid var(--border);
  background: #0d1220;
}
.terminal-bar span {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--dim);
}
.terminal-bar b {
  margin-left: 8px;
  color: var(--dim);
  font: 400 9px/1 var(--mono);
}
.terminal pre {
  margin: 0;
  padding: 30px;
  overflow-x: auto;
  color: var(--text);
  font: 500 12px/1.95 var(--mono);
}
.terminal .muted {
  color: var(--dim);
  margin-right: 12px;
}
.terminal .ok {
  color: var(--green);
}
.terminal .accent {
  color: var(--cyan);
}
.terminal .danger {
  color: var(--danger);
}
.boundary-list {
  margin: 0;
  padding: 0;
  list-style: none;
}
.boundary-list li {
  display: grid;
  grid-template-columns: 40px 1fr;
  gap: 18px;
  padding: 0 0 26px;
  margin-bottom: 26px;
  border-bottom: 1px solid var(--border);
}
.boundary-list > li > span {
  color: var(--cyan);
  font: 500 10px/1 var(--mono);
}
.boundary-list strong {
  font-size: 16px;
}
.boundary-list p {
  margin: 7px 0 0;
  color: var(--muted);
  font-size: 13px;
}

.cta-section {
  padding: 150px 24px;
  text-align: center;
  background:
    radial-gradient(
    circle at 50% 120%,
    rgba(124, 140, 255, 0.19),
    transparent 48%
  ),
    var(--bg-deep);
  border-bottom: 1px solid var(--border);
}
.cta-section h2 {
  max-width: 900px;
  margin: 0 auto;
}
.cta-actions {
  display: flex;
  justify-content: center;
  gap: 10px;
  margin-top: 36px;
}
.site-footer {
  width: min(var(--max), calc(100vw - 48px));
  min-height: 250px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr auto;
  align-content: center;
  gap: 30px;
}
.site-footer strong {
  font-size: 18px;
}
.site-footer p {
  margin: 8px 0 0;
  color: var(--muted);
  font-size: 12px;
}
.site-footer nav {
  display: flex;
  gap: 24px;
  align-items: center;
  color: var(--muted);
  font: 500 11px/1 var(--mono);
}
.site-footer .copyright {
  grid-column: 1 / -1;
  padding-top: 20px;
  border-top: 1px solid var(--border);
  font: 400 10px/1 var(--mono);
}

:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 4px;
}

@keyframes route-dash {
  to {
    stroke-dashoffset: -64;
  }
}
@keyframes gate-pulse {
  0%,
  100% {
    transform: scale(0.98);
    opacity: 0.7;
  }
  50% {
    transform: scale(1.04);
    opacity: 1;
  }
}

@media (max-width: 900px) {
  .site-header {
    grid-template-columns: 1fr auto;
    padding: 0 18px;
  }
  .main-nav {
    display: none;
  }
  .hero {
    padding-top: 130px;
  }
  .router-stage {
    height: 440px;
  }
  .candidate-a {
    left: 4%;
  }
  .candidate-b {
    left: 4%;
  }
  .candidate-c {
    right: 4%;
  }
  .result {
    right: 4%;
  }
  .proof-strip {
    grid-template-columns: repeat(2, 1fr);
  }
  .proof-strip li:nth-child(2) {
    border-right: 0;
  }
  .proof-strip li:nth-child(-n+2) {
    border-bottom: 1px solid var(--border);
  }
  .flow-list li {
    grid-template-columns: 44px 1fr;
    padding: 24px 0;
  }
  .flow-list code {
    grid-column: 2;
    justify-self: start;
  }
  .mode-row {
    grid-template-columns: 200px 1fr;
    padding: 22px 18px;
  }
  .mode-row code {
    grid-column: 2;
    justify-self: start;
  }
  .calibration-section,
  .safety-layout {
    grid-template-columns: 1fr;
    gap: 52px;
  }
  .calibration-section {
    padding-top: 100px;
  }
  .demo-grid {
    grid-template-columns: 1fr;
  }
  .demo-card {
    min-height: 0;
    display: grid;
    grid-template-columns: 230px 1fr;
  }
  .demo-visual {
    height: 100%;
    min-height: 240px;
    border-bottom: 0;
    border-right: 1px solid var(--border);
  }
  .site-footer {
    grid-template-columns: 1fr;
    padding: 60px 0;
  }
  .site-footer nav {
    flex-wrap: wrap;
  }
}

@media (max-width: 640px) {
  :root {
    --border: rgba(159, 178, 215, 0.24);
    --border-strong: rgba(159, 209, 255, 0.38);
  }
  .site-header {
    height: 64px;
  }
  .wordmark span {
    font-size: 14px;
  }
  .mark {
    width: 28px;
    height: 28px;
  }
  .button-small {
    display: none;
  }
  .hero {
    min-height: auto;
    padding: 112px 16px 0;
  }
  .hero h1 {
    margin-top: 28px;
    font-size: clamp(42px, 13vw, 62px);
    line-height: 1.01;
    letter-spacing: -0.06em;
  }
  .hero-lead {
    font-size: 15px;
  }
  .hero-actions {
    flex-direction: column;
    width: 100%;
  }
  .install-command {
    width: 100%;
    min-width: 0;
  }
  .install-command code {
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    font-size: 10px;
  }
  .copy-button {
    margin-left: auto;
    flex: 0 0 62px;
  }
  .router-stage {
    width: calc(100vw - 32px);
    height: 510px;
    margin-top: 46px;
  }
  .router-stage::after {
    content: "";
    position: absolute;
    z-index: 0;
    top: 90px;
    bottom: 72px;
    left: 50%;
    width: 1px;
    background: linear-gradient(
      to bottom,
      transparent,
      rgba(99, 230, 255, 0.42) 22%,
      rgba(124, 140, 255, 0.38) 78%,
      transparent
    );
  }
  .route-lines,
  .orbit {
    display: none;
  }
  .candidate {
    z-index: 1;
    width: 176px;
    left: 50%;
    right: auto;
    padding: 10px 12px;
    transform: translateX(-50%);
  }
  .candidate-a {
    top: 54px;
  }
  .candidate-b {
    top: 120px;
    bottom: auto;
  }
  .candidate-c {
    top: 186px;
  }
  .gate {
    z-index: 1;
    top: 61%;
  }
  .result {
    z-index: 1;
    right: 50%;
    bottom: 30px;
    transform: translateX(50%);
  }
  .proof-strip {
    width: calc(100vw - 32px);
    grid-template-columns: 1fr;
  }
  .proof-strip li {
    min-height: 74px;
    border-right: 0;
    border-bottom: 1px solid var(--border);
  }
  .proof-strip li:last-child {
    border-bottom: 0;
  }
  .section {
    width: calc(100vw - 32px);
    padding: 88px 0;
  }
  .section-heading {
    margin-bottom: 38px;
  }
  .section h2,
  .cta-section h2 {
    font-size: clamp(34px, 10vw, 48px);
  }
  .section-heading > p:last-child,
  .calibration-copy > p:not(.section-index),
  .safety-section .section-heading > p:last-child {
    font-size: 15px;
  }
  .flow-list li {
    grid-template-columns: 34px 1fr;
    gap: 12px;
  }
  .flow-list p,
  .mode-row p,
  .demo-card p,
  .boundary-list p {
    font-size: 14px;
    line-height: 1.5;
  }
  .modes-section,
  .safety-section {
    width: 100%;
    padding-left: 16px;
    padding-right: 16px;
  }
  .mode-row {
    grid-template-columns: 1fr;
    gap: 13px;
    min-height: 0;
    padding: 24px 18px;
  }
  .mode-row:hover {
    padding-left: 18px;
  }
  .mode-row code {
    grid-column: 1;
    justify-self: start;
  }
  .calibration-section {
    display: block;
  }
  .hierarchy {
    margin-top: 46px;
    padding: 16px;
  }
  .hierarchy-row {
    grid-template-columns: auto 1fr;
  }
  .hierarchy-row small,
  .sample,
  .fallback-arrow {
    font-size: 11px;
    line-height: 1.35;
  }
  .sample {
    grid-column: 2;
  }
  .demo-card {
    display: flex;
  }
  .demo-visual {
    height: 190px;
    min-height: 190px;
    border-right: 0;
    border-bottom: 1px solid var(--border);
  }
  .terminal pre {
    padding: 22px 16px;
    font-size: 11px;
  }
  .cta-section {
    padding: 100px 16px;
  }
  .cta-actions {
    flex-direction: column;
  }
  .site-footer {
    width: calc(100vw - 32px);
  }
}

@media (max-width: 410px) {
  .candidate {
    width: 176px;
    padding: 10px 12px;
    column-gap: 8px;
  }
  .candidate > span {
    width: 22px;
    height: 22px;
  }
  .candidate strong {
    font-size: 12px;
  }
  .candidate small {
    font-size: 10px;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  .reveal {
    opacity: 1;
    transform: none;
  }
}