:root {
  color-scheme: light;
  --background: hsl(40 33% 98%);
  --surface: hsl(36 30% 96%);
  --brand: hsl(24 80% 55%);
  --brand-soft: hsl(30 60% 95%);
  --foreground: hsl(220 20% 20%);
  --muted-ink: hsl(220 10% 40%);
  --brand-ink: hsl(24 80% 35%);
  --border: hsl(36 20% 90%);
  --ink-panel: hsl(220 20% 16%);
  --ink-panel-text: hsl(36 30% 92%);
  --radius-card: 1.25rem;
  --radius-pill: 9999px;
  --shadow-warm: 0 8px 32px -8px #b48c641f;
  --container: 64rem;
  --font-body: "Nunito", "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", system-ui, sans-serif;
  --font-mono: ui-monospace, "Cascadia Mono", "SF Mono", Menlo, Consolas, monospace;
}

:lang(ja) {
  --font-body: "Nunito", "Noto Sans JP", "Hiragino Sans", "Yu Gothic UI", "Meiryo", system-ui, sans-serif;
}

:lang(en) {
  --font-body: "Nunito", "Segoe UI", system-ui, -apple-system, "Helvetica Neue", Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 1rem;
}

body {
  margin: 0;
  color: var(--foreground);
  background: var(--background);
  font-family: var(--font-body);
  font-size: 1.0625rem;
  line-height: 1.75;
  overflow-wrap: anywhere;
}

a {
  color: var(--brand-ink);
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.18em;
}

a:hover {
  text-decoration-thickness: 0.14em;
}

a:focus-visible,
button:focus-visible {
  outline: 3px solid var(--brand-ink);
  outline-offset: 4px;
  border-radius: 0.25rem;
}

.skip-link {
  position: absolute;
  z-index: 10;
  top: 0.5rem;
  left: 0.5rem;
  transform: translateY(-160%);
  padding: 0.7rem 1rem;
  color: #fff;
  background: var(--brand-ink);
  border-radius: var(--radius-pill);
  font-weight: 700;
}

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

.container {
  width: min(100% - 2rem, var(--container));
  margin-inline: auto;
}

.narrow,
.container.narrow > * {
  max-width: 44rem;
}

.container.narrow {
  max-width: none;
}

/* Header */

.site-header {
  border-bottom: 1px solid var(--border);
}

.header-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.25rem 1.25rem;
  padding-block: 0.6rem;
}

.brand {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  color: var(--foreground);
  font-size: 1.25rem;
  font-weight: 800;
  text-decoration: none;
  white-space: nowrap;
}

.brand-dot {
  color: var(--brand-ink);
}

.site-nav,
.lang-nav {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0 1rem;
}

.site-nav {
  flex: 1 1 100%;
  order: 3;
}

.site-nav a,
.lang-nav a {
  display: inline-flex;
  min-width: 44px;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  color: var(--foreground);
  font-size: 0.9375rem;
  font-weight: 700;
  text-decoration: underline;
  text-decoration-color: transparent;
  text-underline-offset: 0.25em;
}

.lang-nav {
  gap: 0 0.25rem;
}

.lang-nav a {
  padding-inline: 0.5rem;
  color: var(--muted-ink);
  font-size: 0.875rem;
}

.lang-nav a[aria-current] {
  color: var(--foreground);
  text-decoration-color: var(--brand);
  text-decoration-thickness: 0.14em;
}

.site-nav a:hover,
.lang-nav a:hover {
  color: var(--brand-ink);
  text-decoration-color: currentColor;
}

/* Sections and type */

.section {
  padding-block: 3.5rem;
}

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

h1,
h2,
h3 {
  margin: 0;
  line-height: 1.35;
  text-wrap: balance;
}

h1 {
  max-width: 22ch;
  font-size: 2rem;
  font-weight: 800;
  line-height: 1.25;
}

:lang(ja) h1 {
  max-width: 20em;
  word-break: auto-phrase;
}

:lang(en) h1 {
  max-width: 19ch;
  letter-spacing: -0.01em;
}

h2 {
  margin-bottom: 1.25rem;
  font-size: 1.5rem;
  font-weight: 800;
}

h3 {
  font-size: 1.125rem;
  font-weight: 700;
}

p {
  margin: 0 0 1rem;
}

.eyebrow {
  margin-bottom: 0.9rem;
  color: var(--brand-ink);
  font-size: 0.875rem;
  font-weight: 800;
  letter-spacing: 0.04em;
}

.lead {
  max-width: 40rem;
  margin-top: 1.25rem;
  font-size: 1.125rem;
}

.note {
  color: var(--muted-ink);
  font-size: 0.9375rem;
}

/* Hero */

.hero {
  padding-block: 3.5rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-block: 1.75rem 1rem;
}

.button {
  display: inline-flex;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.7rem 1.3rem;
  border: 2px solid transparent;
  border-radius: var(--radius-pill);
  font-weight: 800;
  line-height: 1.4;
  text-align: center;
  text-decoration: none;
}

.button-primary {
  color: #fff;
  background: var(--brand-ink);
}

.button-primary:hover {
  background: hsl(24 80% 29%);
}

.button-secondary {
  color: var(--brand-ink);
  border-color: var(--brand-ink);
}

.button-secondary:hover {
  background: var(--brand-soft);
}

/* Signs list and version table */

.signs {
  display: grid;
  gap: 0.6rem;
  margin: 0 0 2rem;
  padding: 0;
  list-style: none;
}

.signs li {
  padding: 0.85rem 1rem 0.85rem 1.1rem;
  background: var(--background);
  border: 1px solid var(--border);
  border-left: 4px solid var(--brand);
  border-radius: 0.75rem;
}

.table-wrap {
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9375rem;
}

caption {
  margin-bottom: 0.5rem;
  font-weight: 700;
  text-align: left;
}

th,
td {
  padding: 0.55rem 0.75rem 0.55rem 0;
  border-bottom: 1px solid var(--border);
  text-align: left;
  vertical-align: top;
}

thead th {
  color: var(--muted-ink);
  font-size: 0.8125rem;
}

tbody th {
  font-family: var(--font-mono);
  font-weight: 700;
  white-space: nowrap;
}

.ended {
  color: var(--brand-ink);
  font-weight: 700;
}

/* Case cards */

.cases {
  display: grid;
  gap: 1.25rem;
  margin-top: 1.5rem;
}

.case {
  padding: 1.25rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
}

.case-head {
  margin-bottom: 1rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border);
}

.case-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin: 0.6rem 0 0;
  padding: 0;
  font-size: 0.8125rem;
  font-weight: 700;
  list-style: none;
}

.case-meta li {
  padding: 0.15rem 0.65rem;
  background: var(--background);
  border: 1px solid var(--border);
  border-radius: var(--radius-pill);
}

.case-meta .version {
  font-family: var(--font-mono);
}

.case-meta .status {
  color: var(--brand-ink);
  background: var(--brand-soft);
  border-color: transparent;
}

.case dl {
  display: grid;
  gap: 0.25rem 1.25rem;
  margin: 0;
}

.case dt {
  margin-top: 0.75rem;
  color: var(--muted-ink);
  font-size: 0.8125rem;
  font-weight: 800;
  letter-spacing: 0.04em;
}

.case dt:first-child {
  margin-top: 0;
}

.case dd {
  margin: 0;
}

.case dd ul {
  margin: 0;
  padding-left: 1.15rem;
}

.case dd li + li {
  margin-top: 0.3rem;
}

.case dd li::marker {
  color: var(--brand);
}

/* Process and log */

.steps {
  display: grid;
  gap: 1.25rem;
  margin: 0 0 2.5rem;
  padding: 0;
  list-style: none;
  counter-reset: step;
}

.steps li {
  position: relative;
  padding-left: 3.25rem;
  counter-increment: step;
}

.steps li::before {
  content: counter(step);
  position: absolute;
  top: 0.1rem;
  left: 0;
  display: grid;
  width: 2.25rem;
  height: 2.25rem;
  place-items: center;
  color: var(--brand-ink);
  background: var(--brand-soft);
  border-radius: 50%;
  font-family: var(--font-mono);
  font-weight: 700;
}

.steps p {
  margin: 0.25rem 0 0;
  color: var(--muted-ink);
}

.log {
  margin: 0;
  padding: 1.25rem;
  color: var(--ink-panel-text);
  background: var(--ink-panel);
  border-radius: var(--radius-card);
}

.log figcaption {
  margin-bottom: 0.9rem;
  color: hsl(30 85% 72%);
  font-size: 0.8125rem;
  font-weight: 800;
  letter-spacing: 0.04em;
}

.log ul {
  display: grid;
  gap: 0.55rem;
  margin: 0;
  padding: 0;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  line-height: 1.6;
  list-style: none;
}

.log li {
  padding-left: 1.1rem;
  text-indent: -1.1rem;
}

.log li::before {
  content: "- ";
  color: hsl(30 85% 72%);
}

/* AI split */

.split {
  display: grid;
  gap: 1rem;
  margin-block: 1.5rem;
}

.split > div {
  padding: 1.25rem;
  background: var(--background);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
}

.split ul {
  margin: 0.6rem 0 0;
  padding-left: 1.15rem;
}

.split li + li {
  margin-top: 0.3rem;
}

.text-link {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  gap: 0.35rem;
  font-weight: 700;
}

/* FAQ */

.faq-list {
  margin-top: 0.5rem;
}

.faq-item {
  padding-block: 1.25rem;
  border-top: 1px solid var(--border);
}

.faq-item p {
  margin: 0.5rem 0 0;
  color: var(--muted-ink);
}

/* Contact */

.contact-card {
  padding: 1.5rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 1.5rem;
  box-shadow: var(--shadow-warm);
}

.contact-card .button {
  margin-top: 0.5rem;
}

.site-footer {
  border-top: 1px solid var(--border);
  color: var(--muted-ink);
  font-size: 0.875rem;
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.25rem 1.5rem;
  padding-block: 1rem;
}

.footer-inner p {
  margin: 0;
}

.footer-inner .brand {
  font-size: 1rem;
}

@media (min-width: 768px) {
  .container {
    width: min(100% - 6rem, var(--container));
  }

  .site-nav {
    flex: 0 1 auto;
    order: 0;
    margin-left: auto;
  }

  .section {
    padding-block: 5rem;
  }

  .hero {
    padding-block: 5.5rem 5rem;
  }

  h1 {
    font-size: 2.625rem;
  }

  h2 {
    font-size: 1.875rem;
  }

  .lead {
    font-size: 1.1875rem;
  }

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

  .case {
    padding: 1.75rem 2rem;
  }

  .case dl {
    grid-template-columns: 7rem minmax(0, 1fr);
    row-gap: 1rem;
  }

  .case dt {
    margin-top: 0.3rem;
  }

  .log,
  .contact-card {
    padding: 2rem;
  }
}

@media (min-width: 1024px) {
  h1 {
    font-size: 3.125rem;
  }

  .hero {
    padding-block: 6.5rem 5.5rem;
  }
}

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

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