@font-face {
  font-family: "KORVEN Sans";
  src: local("IBM Plex Sans TC"), local("IBM Plex Sans TC Text");
  font-weight: 400 600;
  font-style: normal;
  font-display: swap;
}

:root {
  color-scheme: light;
  --navy-950: #03122a;
  --navy-900: #05164c;
  --navy-800: #0b2856;
  --teal-700: #006d77;
  --teal-600: #087e83;
  --teal-500: #0cada5;
  --cyan-400: #37cdcb;
  --cyan-200: #a9e5e3;
  --surface-page: #edf5f4;
  --surface: #ffffff;
  --surface-muted: #e6f1ef;
  --surface-deep: #071b37;
  --text: #071b37;
  --text-muted: #4d666c;
  --text-on-dark: #f4fbfa;
  --line: #b7cbc7;
  --line-soft: #d8e5e2;
  --success: #167552;
  --warning: #8c5100;
  --danger: #b12f4b;
  --shadow-sm: 0 10px 30px rgba(7, 27, 55, 0.08);
  --shadow-lg: 0 28px 72px rgba(5, 22, 76, 0.16);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 24px;
  --content: 1180px;
  --reading: 720px;
  --header-height: 72px;
  --transition: 180ms ease;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + 24px);
}

body {
  margin: 0;
  min-width: 320px;
  background: var(--surface-page);
  color: var(--text);
  font-family: "KORVEN Sans", "Noto Sans TC", "Microsoft JhengHei UI", sans-serif;
  font-size: 16px;
  line-height: 1.65;
  text-rendering: optimizeLegibility;
}

body::before {
  position: fixed;
  inset: 0;
  z-index: -1;
  content: "";
  background:
    linear-gradient(rgba(7, 27, 55, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(7, 27, 55, 0.035) 1px, transparent 1px);
  background-size: 32px 32px;
  mask-image: linear-gradient(to bottom, black, transparent 78%);
}

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

a {
  color: inherit;
}

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

button {
  font: inherit;
}

:focus-visible {
  outline: 3px solid var(--cyan-400);
  outline-offset: 3px;
}

.skip-link {
  position: fixed;
  top: 8px;
  left: 8px;
  z-index: 100;
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  background: var(--navy-950);
  color: white;
  transform: translateY(-160%);
  transition: transform var(--transition);
}

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

.container {
  width: min(calc(100% - 32px), var(--content));
  margin-inline: auto;
}

.reading-width {
  max-width: var(--reading);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  height: var(--header-height);
  border-bottom: 1px solid rgba(183, 203, 199, 0.78);
  background: rgba(237, 245, 244, 0.92);
  backdrop-filter: blur(16px);
}

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

.brand-link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  flex: 0 0 auto;
}

.brand-link img {
  width: 146px;
  height: auto;
}

.nav-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  min-width: 88px;
  min-height: 44px;
  gap: 8px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
}

.nav-toggle svg {
  width: 20px;
  height: 20px;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 4px;
}

.site-nav a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  font-weight: 600;
  text-decoration: none;
  transition: background var(--transition), color var(--transition);
}

.site-nav a:hover {
  background: var(--surface-muted);
  color: var(--navy-900);
}

.site-nav a[aria-current="page"] {
  background: var(--navy-900);
  color: white;
}

.hero {
  position: relative;
  overflow: hidden;
  padding: clamp(56px, 8vw, 104px) 0 72px;
}

.hero::after {
  position: absolute;
  top: -180px;
  right: -180px;
  width: 520px;
  height: 520px;
  border: 1px solid rgba(12, 173, 165, 0.25);
  border-radius: 50%;
  content: "";
  box-shadow: 0 0 0 80px rgba(12, 173, 165, 0.035), 0 0 0 160px rgba(5, 22, 76, 0.025);
  pointer-events: none;
}

.hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1.02fr) minmax(420px, 0.98fr);
  align-items: center;
  gap: clamp(40px, 7vw, 88px);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 20px;
  color: var(--teal-700);
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.eyebrow::before {
  width: 28px;
  height: 2px;
  background: var(--teal-500);
  content: "";
}

h1,
h2,
h3 {
  margin-top: 0;
  line-height: 1.18;
  letter-spacing: -0.025em;
}

h1 {
  max-width: 760px;
  margin-bottom: 24px;
  font-size: clamp(2.55rem, 5.3vw, 4.65rem);
  font-weight: 600;
}

.hero-title span {
  display: block;
}

h2 {
  margin-bottom: 18px;
  font-size: clamp(2rem, 3.3vw, 3.2rem);
  font-weight: 600;
}

h3 {
  margin-bottom: 10px;
  font-size: 1.25rem;
}

.hero-copy {
  max-width: 660px;
  margin: 0 0 32px;
  color: var(--text-muted);
  font-size: clamp(1.08rem, 1.5vw, 1.24rem);
}

.actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 12px 20px;
  gap: 10px;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  font-weight: 700;
  text-decoration: none;
  transition: background var(--transition), border-color var(--transition), color var(--transition), box-shadow var(--transition);
}

.button svg {
  width: 20px;
  height: 20px;
}

.button-primary {
  background: var(--navy-900);
  color: white;
  box-shadow: 0 8px 22px rgba(5, 22, 76, 0.18);
}

.button-primary:hover {
  background: var(--navy-800);
  box-shadow: 0 12px 28px rgba(5, 22, 76, 0.24);
}

.button-secondary {
  border-color: var(--line);
  background: rgba(255, 255, 255, 0.72);
  color: var(--navy-900);
}

.button-secondary:hover {
  border-color: var(--teal-500);
  background: white;
}

.trust-list {
  display: flex;
  flex-wrap: wrap;
  margin: 28px 0 0;
  padding: 0;
  gap: 10px;
  list-style: none;
}

.trust-list li {
  display: inline-flex;
  align-items: center;
  min-height: 36px;
  padding: 6px 12px;
  gap: 8px;
  border: 1px solid var(--line-soft);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.6);
  color: var(--text-muted);
  font-size: 0.9rem;
  font-weight: 600;
}

.trust-list span {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--teal-500);
  box-shadow: 0 0 0 4px rgba(12, 173, 165, 0.12);
}

.instrument {
  position: relative;
  overflow: hidden;
  min-height: 500px;
  border: 1px solid rgba(55, 205, 203, 0.2);
  border-radius: var(--radius-lg);
  background: var(--surface-deep);
  color: var(--text-on-dark);
  box-shadow: var(--shadow-lg);
}

.instrument::before {
  position: absolute;
  inset: 0;
  content: "";
  background:
    radial-gradient(circle at 68% 46%, rgba(55, 205, 203, 0.16), transparent 25%),
    linear-gradient(rgba(169, 229, 227, 0.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(169, 229, 227, 0.07) 1px, transparent 1px);
  background-size: auto, 28px 28px, 28px 28px;
}

.instrument-top,
.instrument-bottom {
  position: absolute;
  z-index: 2;
  left: 0;
  right: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 20px;
  background: rgba(3, 18, 42, 0.86);
  backdrop-filter: blur(10px);
}

.instrument-top {
  top: 0;
  border-bottom: 1px solid rgba(169, 229, 227, 0.14);
}

.instrument-bottom {
  bottom: 0;
  border-top: 1px solid rgba(169, 229, 227, 0.14);
}

.instrument-label {
  display: flex;
  align-items: center;
  gap: 9px;
  color: var(--cyan-200);
  font-size: 0.85rem;
  font-weight: 600;
}

.instrument-label::before {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--cyan-400);
  content: "";
}

.instrument-state {
  color: white;
  font-size: 0.85rem;
  font-weight: 600;
}

.route-canvas {
  position: absolute;
  inset: 58px 0 62px;
}

.route-canvas svg {
  width: 100%;
  height: 100%;
}

.route-path-shadow {
  fill: none;
  stroke: rgba(55, 205, 203, 0.16);
  stroke-width: 14;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.route-path {
  fill: none;
  stroke: var(--cyan-400);
  stroke-width: 4;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-dasharray: 8 10;
}

.route-point-ring {
  fill: rgba(55, 205, 203, 0.14);
  stroke: var(--cyan-400);
  stroke-width: 2;
}

.route-point {
  fill: #f4fbfa;
  stroke: var(--navy-950);
  stroke-width: 3;
}

.route-arrow {
  fill: var(--cyan-400);
  stroke: var(--navy-950);
  stroke-width: 3;
}

.map-note {
  position: absolute;
  z-index: 2;
  max-width: 170px;
  padding: 12px 14px;
  border: 1px solid rgba(169, 229, 227, 0.18);
  border-radius: var(--radius-sm);
  background: rgba(3, 18, 42, 0.82);
  box-shadow: 0 16px 30px rgba(3, 18, 42, 0.25);
}

.map-note strong,
.map-note span {
  display: block;
}

.map-note strong {
  margin-bottom: 2px;
  font-size: 0.9rem;
}

.map-note span {
  color: var(--cyan-200);
  font-size: 0.78rem;
}

.note-a {
  top: 25%;
  left: 7%;
}

.note-b {
  right: 7%;
  bottom: 25%;
}

.section {
  padding: clamp(72px, 9vw, 120px) 0;
}

.section-white {
  background: var(--surface);
}

.section-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  margin-bottom: 40px;
  gap: 32px;
}

.section-heading p {
  max-width: 560px;
  margin: 0;
  color: var(--text-muted);
  font-size: 1.08rem;
}

.flow-grid,
.feature-grid,
.scenario-grid,
.requirements-grid,
.footer-grid {
  display: grid;
  gap: 16px;
}

.flow-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.flow-grid-four {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.feature-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.feature-card-wide {
  grid-column: 1 / -1;
  min-height: 220px;
}

.scenario-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.scenario-more {
  margin-top: 16px;
}

.scenario-more > summary {
  display: none;
}

.scenario-more:not([open]) > .scenario-more-grid {
  display: grid;
}

.scenario-card {
  min-height: 220px;
  padding: 28px;
}

.scenario-card > span {
  display: block;
  margin-bottom: 22px;
  color: var(--teal-700);
  font-family: "Cascadia Mono", Consolas, monospace;
  font-size: 0.88rem;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.scenario-card p {
  margin: 0;
  color: var(--text-muted);
}

.use-notice {
  margin: 24px 0 0;
  padding: 18px 20px;
  border-left: 4px solid var(--teal-500);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  background: rgba(230, 241, 239, 0.82);
  color: var(--text-muted);
}

.requirements-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.card {
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-md);
  background: var(--surface);
  box-shadow: var(--shadow-sm);
}

.flow-card {
  padding: 28px;
}

.step-number {
  display: inline-grid;
  width: 40px;
  height: 40px;
  margin-bottom: 26px;
  place-items: center;
  border-radius: 50%;
  background: var(--surface-muted);
  color: var(--teal-700);
  font-family: "Cascadia Mono", Consolas, monospace;
  font-size: 0.9rem;
  font-weight: 700;
}

.flow-card p,
.feature-card p,
.requirement-card p {
  margin-bottom: 0;
  color: var(--text-muted);
}

.feature-card {
  position: relative;
  overflow: hidden;
  min-height: 260px;
  padding: 32px;
}

.feature-card::after {
  position: absolute;
  right: -42px;
  bottom: -72px;
  width: 180px;
  height: 180px;
  border: 1px solid rgba(12, 173, 165, 0.2);
  border-radius: 50%;
  content: "";
}

.feature-icon,
.requirement-icon {
  display: grid;
  width: 48px;
  height: 48px;
  margin-bottom: 34px;
  place-items: center;
  border-radius: var(--radius-sm);
  background: var(--surface-muted);
  color: var(--teal-700);
}

.feature-icon svg,
.requirement-icon svg {
  width: 24px;
  height: 24px;
}

.safety-section {
  position: relative;
  overflow: hidden;
  background: var(--surface-deep);
  color: var(--text-on-dark);
}

.safety-section::before {
  position: absolute;
  inset: 0;
  content: "";
  background:
    linear-gradient(120deg, transparent 48%, rgba(55, 205, 203, 0.08) 48.1%, transparent 48.7%),
    radial-gradient(circle at 100% 0%, rgba(12, 173, 165, 0.2), transparent 35%);
}

.safety-grid {
  position: relative;
  display: grid;
  grid-template-columns: 0.85fr 1.15fr;
  gap: clamp(48px, 8vw, 100px);
  align-items: start;
}

.safety-grid .eyebrow {
  color: var(--cyan-200);
}

.safety-copy {
  color: #a8bfbe;
  font-size: 1.08rem;
}

.state-list {
  margin: 0;
  padding: 0;
  border-top: 1px solid rgba(169, 229, 227, 0.2);
  list-style: none;
}

.state-list li {
  display: grid;
  grid-template-columns: 112px 1fr;
  padding: 22px 0;
  gap: 20px;
  border-bottom: 1px solid rgba(169, 229, 227, 0.2);
}

.state-list strong {
  color: white;
}

.state-list span {
  color: #a8bfbe;
}

.requirement-card {
  padding: 28px;
}

.section-actions {
  margin-top: 32px;
}

.status-panel {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  padding: clamp(28px, 5vw, 52px);
  gap: 32px;
  border: 1px solid var(--line);
  border-left: 5px solid var(--teal-500);
  border-radius: var(--radius-md);
  background: var(--surface);
  box-shadow: var(--shadow-sm);
}

.status-panel h2 {
  margin-bottom: 10px;
  font-size: clamp(1.7rem, 3vw, 2.5rem);
}

.status-panel p {
  max-width: 670px;
  margin: 0;
  color: var(--text-muted);
}

.status-badge {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 10px 16px;
  gap: 9px;
  border: 1px solid #e2b366;
  border-radius: 999px;
  background: #fff8e7;
  color: #734300;
  font-weight: 700;
  text-decoration: none;
  white-space: nowrap;
}

.status-badge:hover {
  border-color: var(--warning);
  background: #fff3cf;
}

.status-badge::before {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: #b56d00;
  content: "";
}

.page-hero {
  padding: clamp(56px, 8vw, 96px) 0 64px;
}

.page-hero h1 {
  max-width: 1060px;
  font-size: clamp(2.6rem, 4.6vw, 4.3rem);
}

.page-intro {
  max-width: 720px;
  color: var(--text-muted);
  font-size: 1.15rem;
}

.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  margin: 0 0 28px;
  padding: 0;
  gap: 8px;
  color: var(--text-muted);
  font-size: 0.9rem;
  list-style: none;
}

.breadcrumbs li:not(:last-child)::after {
  margin-left: 8px;
  color: var(--line);
  content: "/";
}

.breadcrumbs a:hover {
  color: var(--teal-700);
}

.content-section {
  padding: 0 0 88px;
}

.content-stack {
  display: grid;
  gap: 24px;
}

.info-block {
  padding: clamp(24px, 5vw, 40px);
}

.info-block ul,
.info-block ol {
  margin-bottom: 0;
  padding-left: 1.3em;
}

.info-block li + li {
  margin-top: 10px;
}

.callout {
  padding: 20px 22px;
  border-left: 4px solid var(--teal-500);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  background: var(--surface-muted);
}

.callout strong {
  display: block;
  margin-bottom: 4px;
}

.guide-nav {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  margin: 0 0 48px;
  padding: 0;
  gap: 12px;
  list-style: none;
}

.guide-nav a {
  display: flex;
  min-height: 72px;
  align-items: center;
  justify-content: center;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--surface);
  color: var(--navy-900);
  font-weight: 700;
  text-align: center;
  text-decoration: none;
}

.guide-nav a:hover {
  border-color: var(--teal-500);
  background: var(--surface-muted);
}

.guide-step {
  scroll-margin-top: calc(var(--header-height) + 24px);
}

.guide-step + .guide-step {
  margin-top: 24px;
}

.guide-step header {
  display: flex;
  align-items: center;
  margin-bottom: 18px;
  gap: 16px;
}

.guide-step header .step-number {
  flex: 0 0 auto;
  margin: 0;
}

.guide-step header h2 {
  margin: 0;
  font-size: clamp(1.5rem, 3vw, 2rem);
}

.faq-list {
  display: grid;
  gap: 12px;
}

.faq-list details {
  overflow: hidden;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-md);
  background: var(--surface);
}

.faq-list summary {
  position: relative;
  display: flex;
  min-height: 64px;
  align-items: center;
  padding: 18px 58px 18px 22px;
  color: var(--navy-900);
  font-size: 1.05rem;
  font-weight: 700;
  cursor: pointer;
  list-style: none;
}

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

.faq-list summary::after {
  position: absolute;
  right: 22px;
  width: 12px;
  height: 12px;
  border-right: 2px solid currentColor;
  border-bottom: 2px solid currentColor;
  content: "";
  transform: rotate(45deg) translateY(-3px);
  transition: transform var(--transition);
}

.faq-list details[open] summary::after {
  transform: rotate(225deg) translate(-2px, -2px);
}

.faq-list details[open] summary {
  background: var(--surface-muted);
}

.faq-answer {
  padding: 18px 22px 24px;
  border-top: 1px solid var(--line-soft);
  color: var(--text-muted);
}

.faq-answer p {
  margin: 0;
}

.not-found {
  display: grid;
  min-height: calc(100vh - var(--header-height));
  padding: 64px 0;
  place-items: center;
  text-align: center;
}

.not-found-code {
  margin: 0;
  color: var(--teal-700);
  font-family: "Cascadia Mono", Consolas, monospace;
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.16em;
}

.site-footer {
  padding: 56px 0 32px;
  border-top: 1px solid var(--line);
  background: var(--surface);
}

.footer-grid {
  grid-template-columns: 1.4fr 0.6fr 0.6fr;
  align-items: start;
}

.footer-brand img {
  width: 140px;
  margin-bottom: 18px;
}

.footer-brand p {
  max-width: 440px;
  margin: 0;
  color: var(--text-muted);
}

.footer-group h2 {
  margin-bottom: 12px;
  color: var(--text-muted);
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.footer-links {
  display: grid;
  margin: 0;
  padding: 0;
  gap: 8px;
  list-style: none;
}

.footer-links a {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  color: var(--navy-900);
  font-weight: 600;
  text-decoration: none;
}

.footer-links a:hover {
  color: var(--teal-700);
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  margin-top: 40px;
  padding-top: 24px;
  gap: 16px;
  border-top: 1px solid var(--line-soft);
  color: var(--text-muted);
  font-size: 0.85rem;
}

@media (max-width: 920px) {
  .hero-grid,
  .safety-grid {
    grid-template-columns: 1fr;
  }

  .hero-grid {
    gap: 48px;
  }

  .instrument {
    min-height: 460px;
  }

  .section-heading {
    display: block;
  }

  .section-heading p {
    margin-top: 16px;
  }

  .flow-grid,
  .requirements-grid {
    grid-template-columns: 1fr;
  }

  .flow-grid-four,
  .scenario-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .footer-brand {
    grid-column: 1 / -1;
    margin-bottom: 20px;
  }

  .guide-nav {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 760px) {
  :root {
    --header-height: 64px;
  }

  .container {
    width: min(calc(100% - 24px), var(--content));
  }

  .brand-link img {
    width: 126px;
  }

  .nav-toggle {
    display: inline-flex;
  }

  .site-nav {
    position: absolute;
    z-index: 2;
    top: calc(100% + 8px);
    left: 12px;
    right: 12px;
    display: none;
    padding: 8px;
    border: 1px solid var(--line);
    border-radius: var(--radius-md);
    background: var(--surface);
    box-shadow: var(--shadow-lg);
  }

  .site-nav[data-open="true"] {
    display: grid;
  }

  body.nav-open {
    overflow: hidden;
  }

  body.nav-open .site-header::after {
    position: fixed;
    z-index: 1;
    inset: var(--header-height) 0 0;
    background: rgba(3, 18, 42, 0.42);
    content: "";
    backdrop-filter: blur(2px);
  }

  .site-nav a {
    justify-content: flex-start;
    min-height: 48px;
  }

  .hero {
    padding-top: 48px;
  }

  .section {
    padding: 56px 0;
  }

  h1 {
    font-size: clamp(2.45rem, 13vw, 4rem);
  }

  .hero-copy,
  .page-intro {
    font-size: 1.05rem;
  }

  .actions {
    align-items: stretch;
    flex-direction: column;
  }

  .button {
    width: 100%;
  }

  .instrument {
    min-height: 420px;
    border-radius: 18px;
  }

  .instrument-top,
  .instrument-bottom {
    padding: 14px 16px;
  }

  .map-note {
    max-width: 142px;
    padding: 10px;
  }

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

  .feature-card-wide {
    grid-column: auto;
  }

  .flow-grid-four,
  .scenario-grid {
    grid-template-columns: 1fr;
  }

  .scenario-more > summary {
    display: flex;
    min-height: 48px;
    align-items: center;
    justify-content: space-between;
    padding: 12px 16px;
    border: 1px solid var(--line);
    border-radius: var(--radius-sm);
    background: var(--surface);
    color: var(--navy-900);
    font-weight: 700;
    cursor: pointer;
    list-style: none;
  }

  .scenario-more > summary::-webkit-details-marker {
    display: none;
  }

  .scenario-more > summary::after {
    content: "+";
    color: var(--teal-700);
    font-size: 1.35rem;
    line-height: 1;
  }

  .scenario-more[open] > summary::after {
    content: "−";
  }

  .scenario-more:not([open]) > .scenario-more-grid {
    display: none;
  }

  .scenario-more-grid {
    margin-top: 12px;
  }

  .feature-card {
    min-height: auto;
    display: grid;
    grid-template-columns: 48px minmax(0, 1fr);
    padding: 24px;
    column-gap: 16px;
  }

  .feature-card .feature-icon {
    grid-row: 1 / 3;
    margin: 0;
  }

  .feature-card h3,
  .feature-card p {
    grid-column: 2;
  }

  .feature-card h3 {
    margin: 0 0 6px;
  }

  .flow-card {
    display: grid;
    grid-template-columns: 40px minmax(0, 1fr);
    padding: 24px;
    column-gap: 16px;
  }

  .flow-card .step-number {
    grid-row: 1 / 3;
    margin: 0;
  }

  .flow-card h3,
  .flow-card p {
    grid-column: 2;
  }

  .flow-card h3 {
    margin: 0 0 6px;
  }

  .status-panel {
    grid-template-columns: 1fr;
  }

  .status-badge {
    justify-self: start;
  }

  .state-list li {
    grid-template-columns: 1fr;
    gap: 4px;
  }

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

  .footer-brand {
    grid-column: auto;
  }

  .footer-bottom {
    flex-direction: column;
  }
}

@media (max-width: 440px) {
  .guide-nav {
    grid-template-columns: 1fr;
  }

  .trust-list {
    display: grid;
  }

  .trust-list li {
    border-radius: var(--radius-sm);
  }

  .instrument-state {
    display: none;
  }
}

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

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}

@media (forced-colors: active) {
  .eyebrow::before,
  .instrument-label::before,
  .status-badge::before,
  .trust-list span {
    border: 1px solid currentColor;
  }
}