styles.css

:root {
  color-scheme: light dark;
  --color-primary: #1e3a5f;
  --color-on-primary: #ffffff;
  --color-secondary: #2563eb;
  --color-on-secondary: #ffffff;
  --color-accent: #a16207;
  --color-on-accent: #ffffff;
  --color-background: #f8fafc;
  --color-foreground: #0f172a;
  --color-card: #ffffff;
  --color-card-foreground: #0f172a;
  --color-muted: #e9eef5;
  --color-muted-foreground: #475569;
  --color-border: #cbd5e1;
  --color-ring: #2563eb;
  --color-error: #b42318;
  --color-on-error: #ffffff;
  --color-dark-surface: #1e3a5f;
  --color-on-dark-surface: #ffffff;
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --space-7: 3rem;
  --space-8: 4rem;
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --shadow-card: 0 1rem 3rem rgb(15 23 42 / 0.08);
  --font-heading: Georgia, "Times New Roman", "Yu Mincho", "Songti SC", serif;
  --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans", Arial, sans-serif;
  --content-width: 76rem;
  --motion-fast: 180ms ease;
}

* {
  box-sizing: border-box;
}

html {
  min-width: 20rem;
  background: var(--color-background);
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  min-height: 100dvh;
  margin: 0;
  background:
    linear-gradient(90deg, transparent calc(50% - 0.5px), rgb(203 213 225 / 0.28) 50%, transparent calc(50% + 0.5px)),
    var(--color-background);
  color: var(--color-foreground);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.65;
  text-rendering: optimizeLegibility;
}

button,
select {
  font: inherit;
}

button,
select,
a {
  touch-action: manipulation;
}

button,
select {
  cursor: pointer;
}

a {
  color: var(--color-secondary);
  text-underline-offset: 0.2em;
}

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

:focus-visible {
  outline: 3px solid var(--color-ring);
  outline-offset: 3px;
}

::selection {
  background: var(--color-secondary);
  color: var(--color-on-secondary);
}

h1,
h2,
h3,
h4,
p {
  margin-block-start: 0;
}

h1,
h2,
h3,
h4 {
  color: var(--color-primary);
  font-family: var(--font-heading);
  font-weight: 600;
  line-height: 1.08;
  text-wrap: balance;
}

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

.visually-hidden {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  margin: -1px !important;
  overflow: hidden !important;
  clip: rect(0, 0, 0, 0) !important;
  white-space: nowrap !important;
  border: 0 !important;
}

[hidden] {
  display: none !important;
}

.noscript-notice {
  margin: 0;
  padding: var(--space-4);
  border-block-end: 1px solid var(--color-border);
  background: var(--color-muted);
  color: var(--color-foreground);
  text-align: center;
}

.skip-link {
  position: fixed;
  inset-block-start: var(--space-3);
  inset-inline-start: var(--space-3);
  z-index: 100;
  min-height: 44px;
  padding: 0.65rem 1rem;
  translate: 0 -200%;
  background: var(--color-card);
  border: 2px solid var(--color-primary);
  color: var(--color-primary);
  font-weight: 700;
}

.skip-link:focus {
  translate: 0;
}

.site-header {
  border-block-end: 1px solid var(--color-border);
  background: rgb(248 250 252 / 0.94);
}

.header-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: var(--space-4);
  align-items: center;
  min-height: 5rem;
  padding-block: var(--space-3);
}

.brand {
  display: flex;
  min-width: 0;
  align-items: center;
  gap: var(--space-3);
  color: var(--color-primary);
  font-weight: 750;
  letter-spacing: -0.01em;
}

.brand-mark {
  display: grid;
  width: 2.75rem;
  height: 2.75rem;
  flex: 0 0 auto;
  place-items: center;
  background: var(--color-primary);
  color: var(--color-on-primary);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
}

.brand-name {
  overflow-wrap: anywhere;
}

.interface-language {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.interface-language label {
  color: var(--color-muted-foreground);
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

select {
  min-height: 44px;
  max-width: 100%;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-card);
  color: var(--color-card-foreground);
}

.interface-language select {
  padding: 0.5rem 2.25rem 0.5rem 0.75rem;
}

.hero {
  padding-block: clamp(3rem, 8vw, 7.5rem) clamp(3rem, 6vw, 6rem);
}

.eyebrow,
.activity-context {
  color: var(--color-secondary);
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.hero-grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: var(--space-4);
  align-items: end;
}

.hero-copy {
  grid-column: 1 / span 8;
}

h1 {
  max-width: 15ch;
  margin-block-end: var(--space-5);
  font-size: clamp(2.7rem, 7vw, 6.5rem);
  letter-spacing: -0.05em;
}

.hero-intro {
  max-width: 59ch;
  margin: 0;
  color: var(--color-muted-foreground);
  font-size: clamp(1.05rem, 2vw, 1.3rem);
}

.draft-notice {
  grid-column: 9 / -1;
  margin: 0;
  padding: var(--space-5);
  border-block-start: 5px solid var(--color-accent);
  background: var(--color-muted);
}

.draft-notice h2 {
  margin-block-end: var(--space-3);
  font-size: 1.45rem;
}

.draft-notice p:last-child {
  margin: 0;
  color: var(--color-foreground);
}

.notice-index,
.section-number,
.record-position {
  color: var(--color-muted-foreground);
  font-size: 0.75rem;
  font-variant-numeric: tabular-nums;
  font-weight: 750;
  letter-spacing: 0.08em;
}

.explorer,
.results {
  padding-block: var(--space-7);
  border-block-start: 1px solid var(--color-border);
}

.section-heading {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: var(--space-4);
  margin-block-end: var(--space-6);
}

.section-number {
  grid-column: 1 / span 1;
  padding-block-start: 0.4rem;
}

.section-heading > div {
  grid-column: 3 / span 8;
}

.section-heading h2 {
  margin-block-end: var(--space-2);
  font-size: clamp(2rem, 4vw, 3.5rem);
  letter-spacing: -0.035em;
}

.section-heading p:last-child {
  max-width: 65ch;
  margin: 0;
  color: var(--color-muted-foreground);
}

.controls {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: var(--space-4);
  align-items: end;
  padding: var(--space-5);
  background: var(--color-dark-surface);
  color: var(--color-on-dark-surface);
}

.control-field {
  grid-column: span 3;
  min-width: 0;
}

.control-topic {
  grid-column: span 3;
}

.control-field label {
  display: block;
  margin-block-end: var(--space-2);
  font-size: 0.8125rem;
  font-weight: 750;
}

.control-field select {
  width: 100%;
  min-height: 48px;
  padding: 0.65rem 2.25rem 0.65rem 0.75rem;
  border-color: rgb(255 255 255 / 0.55);
}

.control-field select:disabled {
  cursor: wait;
  opacity: 0.68;
}

.primary-button,
.secondary-button {
  min-height: 48px;
  border-radius: var(--radius-sm);
  font-weight: 800;
  transition:
    background-color var(--motion-fast),
    color var(--motion-fast),
    box-shadow var(--motion-fast),
    border-color var(--motion-fast);
}

.primary-button {
  display: flex;
  grid-column: span 3;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  padding: 0.65rem 1rem;
  border: 2px solid var(--color-accent);
  background: var(--color-accent);
  color: var(--color-on-accent);
  text-align: start;
}

.primary-button:hover:not(:disabled) {
  border-color: var(--color-on-dark-surface);
  box-shadow: inset 0 0 0 1px var(--color-on-dark-surface);
}

.primary-button:disabled {
  cursor: wait;
  opacity: 0.6;
}

.button-rule {
  width: 2.5rem;
  height: 2px;
  flex: 0 0 auto;
  background: currentColor;
}

.results {
  padding-block-end: clamp(4rem, 9vw, 8rem);
}

#result-region {
  min-height: 24rem;
}

.state-panel {
  display: grid;
  min-height: 24rem;
  place-content: center;
  padding: var(--space-6);
  border: 1px solid var(--color-border);
  background: var(--color-card);
  text-align: center;
}

.state-panel h3 {
  margin-block: var(--space-5) var(--space-3);
  font-size: clamp(1.65rem, 3vw, 2.4rem);
}

.state-panel p {
  max-width: 48ch;
  margin: 0 auto;
  color: var(--color-muted-foreground);
}

.state-panel[data-state="error"] {
  border-block-start: 5px solid var(--color-error);
}

.state-lines {
  display: grid;
  width: min(18rem, 70vw);
  gap: var(--space-2);
  margin-inline: auto;
}

.state-lines span {
  display: block;
  height: 3px;
  background: var(--color-border);
  transform-origin: left;
  animation: loading-line 1.3s ease-in-out infinite alternate;
}

.state-lines span:nth-child(2) {
  width: 72%;
  animation-delay: 130ms;
}

.state-lines span:nth-child(3) {
  width: 43%;
  animation-delay: 260ms;
}

.state-panel:not([data-state="loading"]) .state-lines span {
  animation: none;
}

.secondary-button {
  margin-block-start: var(--space-5);
  padding: 0.65rem 1.25rem;
  border: 2px solid var(--color-primary);
  background: transparent;
  color: var(--color-primary);
}

.secondary-button:hover {
  background: var(--color-primary);
  color: var(--color-on-primary);
}

.activity-card {
  overflow: hidden;
  border: 1px solid var(--color-border);
  background: var(--color-card);
  box-shadow: var(--shadow-card);
  color: var(--color-card-foreground);
}

.activity-header {
  padding: clamp(1.5rem, 5vw, 4rem);
  border-block-end: 1px solid var(--color-border);
}

.activity-kicker-row {
  display: flex;
  justify-content: space-between;
  gap: var(--space-4);
}

.activity-card h3 {
  max-width: 22ch;
  margin-block: var(--space-4) var(--space-5);
  font-size: clamp(2.15rem, 5vw, 4.75rem);
  letter-spacing: -0.04em;
  overflow-wrap: anywhere;
}

.status-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.status-badge {
  display: inline-flex;
  min-height: 2rem;
  align-items: center;
  padding: 0.25rem 0.65rem;
  border: 1px solid var(--color-accent);
  color: var(--color-accent);
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.status-badge-review {
  background: var(--color-accent);
  color: var(--color-on-accent);
}

.activity-body {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: 0 var(--space-4);
  padding: clamp(1.5rem, 5vw, 4rem);
}

.activity-section {
  grid-column: 3 / span 8;
  padding-block: var(--space-6);
  border-block-start: 1px solid var(--color-border);
}

.activity-section:first-child {
  padding-block-start: 0;
  border-block-start: 0;
}

.activity-section h4 {
  margin-block-end: var(--space-4);
  font-size: clamp(1.4rem, 3vw, 2rem);
}

.activity-section p,
.activity-section li {
  max-width: 70ch;
  overflow-wrap: anywhere;
}

.activity-section p:last-child,
.activity-section ul:last-child,
.activity-section ol:last-child {
  margin-block-end: 0;
}

.activity-section ul,
.activity-section ol {
  padding-inline-start: 1.35rem;
}

.activity-section li + li {
  margin-block-start: var(--space-2);
}

.prompt-block,
.question-block {
  padding-inline-start: var(--space-5);
  border-inline-start: 5px solid var(--color-secondary);
  font-size: clamp(1.05rem, 2vw, 1.2rem);
}

.question-block {
  border-color: var(--color-accent);
  font-family: var(--font-heading);
  font-size: clamp(1.25rem, 2.8vw, 1.75rem);
  line-height: 1.35;
}

.perspectives-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-4);
}

.perspective-card {
  padding: var(--space-5);
  border: 1px solid var(--color-border);
  background: var(--color-muted);
}

.perspective-label {
  margin-block-end: var(--space-3);
  color: var(--color-secondary);
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.perspective-card h5 {
  margin-block: 0 var(--space-3);
  color: var(--color-primary);
  font-family: var(--font-heading);
  font-size: 1.35rem;
  line-height: 1.2;
}

.perspective-card h6 {
  margin-block: var(--space-5) var(--space-2);
  color: var(--color-foreground);
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  padding: 0 !important;
  list-style: none;
}

.tag-list li {
  margin: 0 !important;
  padding: 0.35rem 0.65rem;
  border: 1px solid var(--color-border);
  background: var(--color-muted);
  font-size: 0.875rem;
}

.callout {
  padding: var(--space-5);
  border-inline-start: 5px solid var(--color-accent);
  background: var(--color-muted);
}

.activity-footer {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: var(--space-4);
  align-items: center;
  padding: var(--space-5) clamp(1.5rem, 5vw, 4rem);
  border-block-start: 1px solid var(--color-border);
  background: var(--color-muted);
}

.activity-footer p {
  grid-column: 1 / span 7;
  margin: 0;
  color: var(--color-muted-foreground);
  font-size: 0.9rem;
}

.source-link {
  display: inline-flex;
  grid-column: 9 / -1;
  min-height: 44px;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  color: var(--color-primary);
  font-weight: 800;
}

.site-footer {
  padding-block: var(--space-6);
  background: var(--color-dark-surface);
  color: var(--color-on-dark-surface);
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: var(--space-4);
  align-items: center;
}

.footer-grid p {
  display: flex;
  grid-column: 1 / span 7;
  flex-wrap: wrap;
  gap: var(--space-2) var(--space-4);
  margin: 0;
}

.footer-grid p span:first-child {
  font-weight: 800;
}

.footer-grid nav {
  display: flex;
  grid-column: 9 / -1;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: var(--space-2) var(--space-4);
}

.footer-grid a {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  color: var(--color-on-dark-surface);
}

@keyframes loading-line {
  from { transform: scaleX(0.18); }
  to { transform: scaleX(1); }
}

@media (max-width: 64rem) {
  .hero-copy {
    grid-column: 1 / span 7;
  }

  .draft-notice {
    grid-column: 8 / -1;
  }

  .control-field,
  .control-topic,
  .primary-button {
    grid-column: span 6;
  }

  .activity-section {
    grid-column: 2 / span 10;
  }
}

@media (max-width: 48rem) {
  body {
    background: var(--color-background);
  }

  .header-grid,
  .interface-language {
    align-items: stretch;
  }

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

  .interface-language {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-1);
  }

  .hero-grid,
  .section-heading,
  .controls,
  .activity-body,
  .activity-footer,
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .hero-copy,
  .draft-notice,
  .section-number,
  .section-heading > div,
  .control-field,
  .control-topic,
  .primary-button,
  .activity-section,
  .activity-footer p,
  .source-link,
  .footer-grid p,
  .footer-grid nav {
    grid-column: 1;
  }

  .section-heading {
    gap: var(--space-2);
  }

  .controls {
    padding: var(--space-4);
  }

  .activity-kicker-row,
  .perspectives-grid {
    display: grid;
    grid-template-columns: 1fr;
  }

  .activity-footer {
    align-items: start;
  }

  .footer-grid nav {
    justify-content: flex-start;
  }
}

@media (max-width: 23.4375rem) {
  .shell {
    width: min(100% - 1.5rem, var(--content-width));
  }

  h1 {
    font-size: clamp(2.35rem, 13vw, 3.25rem);
  }

  .brand-name {
    font-size: 0.95rem;
  }

  .activity-header,
  .activity-body,
  .activity-footer {
    padding-inline: var(--space-4);
  }
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-primary: #bfdbfe;
    --color-on-primary: #0b1220;
    --color-secondary: #93c5fd;
    --color-on-secondary: #0b1220;
    --color-accent: #fbbf24;
    --color-on-accent: #1f2937;
    --color-background: #0b1220;
    --color-foreground: #f8fafc;
    --color-card: #111c2e;
    --color-card-foreground: #f8fafc;
    --color-muted: #192842;
    --color-muted-foreground: #cbd5e1;
    --color-border: #64748b;
    --color-ring: #fbbf24;
    --color-error: #fda4af;
    --color-on-error: #1f2937;
    --color-dark-surface: #14233a;
    --color-on-dark-surface: #f8fafc;
    --shadow-card: 0 1rem 3rem rgb(0 0 0 / 0.3);
  }

  .site-header {
    background: rgb(11 18 32 / 0.94);
  }

  .brand-mark {
    background: #1e3a5f;
    color: #ffffff;
  }

  .control-field select {
    border-color: var(--color-border);
  }
}

@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;
  }
}