/* Quoridor Online — design system. Tokens follow docs/architecture-spec.md §6. */

:root {
  --color-bg: #0b1220;
  --color-surface: #111c30;
  --color-text: #ffffff;
  --color-text-muted: #91a4bf;
  --color-accent: #42d9f5;
  --color-accent-2: #5267f2;
  --color-player-2: #ff9f43;
  --color-border: #26364f;
  --color-danger: #ff8a96;
  --color-success: #5eead4;
  --control-border: #91a4bf; /* >= 3:1 against bg and surface; --color-border is decorative only */

  --gradient-cta: linear-gradient(135deg, #42d9f5 0%, #5aa6f5 100%);
  --gradient-selected: linear-gradient(135deg, rgba(66, 217, 245, 0.14), rgba(82, 103, 242, 0.26));

  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 24px;
  --space-6: 32px;
  --space-7: 48px;
  --space-8: 64px;
  --space-9: 96px;

  --radius-control: 8px;
  --radius-card: 12px;
  --radius-panel: 16px;

  --font: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --container: 1120px;
  --prose: 720px;
  --gutter: 16px;
  --header-h: 60px;
  color-scheme: dark;
}

@media (min-width: 768px) {
  :root { --gutter: 24px; }
}
@media (min-width: 1024px) {
  :root { --gutter: 32px; }
}

*, *::before, *::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-padding-top: calc(var(--header-h) + var(--space-4));
}

body {
  margin: 0;
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font);
  font-size: 1rem;
  line-height: 1.65;
  overflow-wrap: break-word;
}

@media (min-width: 1024px) {
  body { font-size: 1.0625rem; }
}

main { flex: 1 0 auto; }

img, svg { max-width: 100%; height: auto; }

h1, h2, h3, h4 {
  margin: 0 0 var(--space-4);
  font-weight: 600;
  text-wrap: balance;
}
h1 { font-size: clamp(2rem, 1.4rem + 3vw, 3.5rem); line-height: 1.1; letter-spacing: -0.02em; font-weight: 700; }
h2 { font-size: clamp(1.5rem, 1.2rem + 1.5vw, 2.25rem); line-height: 1.2; letter-spacing: -0.01em; }
h3 { font-size: clamp(1.125rem, 1.05rem + 0.4vw, 1.375rem); line-height: 1.3; }
h4 { font-size: 1.0625rem; line-height: 1.35; }
p { margin: 0 0 var(--space-4); }
ul, ol { margin: 0 0 var(--space-4); padding-left: 1.25em; }
li + li { margin-top: var(--space-2); }

a { color: var(--color-accent); text-decoration: underline; text-underline-offset: 0.2em; }
a:hover { color: #8fe9fa; }

:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 2px;
  border-radius: 4px;
}

.skip-link {
  position: absolute;
  left: var(--space-4);
  top: -100px;
  z-index: 100;
  padding: var(--space-3) var(--space-4);
  background: var(--color-accent);
  color: var(--color-bg);
  font-weight: 600;
  border-radius: var(--radius-control);
}
.skip-link:focus { top: var(--space-2); }

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

.container { width: 100%; max-width: calc(var(--container) + 2 * var(--gutter)); margin-inline: auto; padding-inline: var(--gutter); }
.prose { max-width: var(--prose); }
.text-muted { color: var(--color-text-muted); }
.small { font-size: 0.875rem; line-height: 1.5; }
.lead { font-size: clamp(1.0625rem, 1rem + 0.5vw, 1.25rem); line-height: 1.55; color: var(--color-text-muted); }
.eyebrow { font-size: 0.875rem; font-weight: 600; letter-spacing: 0.08em; text-transform: uppercase; color: var(--color-accent); margin-bottom: var(--space-3); }

.section { padding-block: var(--space-7); }
@media (min-width: 768px) { .section { padding-block: var(--space-9); } }
.section--tight { padding-block: var(--space-6); }
.section-head { margin-bottom: var(--space-6); max-width: var(--prose); }
.section-head p:last-child { margin-bottom: 0; }

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(11, 18, 32, 0.96);
  border-bottom: 1px solid var(--color-border);
}
.header-bar {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  min-height: var(--header-h);
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  margin-right: auto;
  color: var(--color-text);
  font-weight: 600;
  font-size: 1.125rem;
  text-decoration: none;
  min-height: 44px;
}
.brand:hover { color: var(--color-text); }
.brand img { width: 32px; height: 32px; flex: none; }
.brand .tld { color: var(--color-accent); }
.brand-name { display: none; }
@media (min-width: 400px) { .brand-name { display: inline; } }

.header-actions { display: flex; align-items: center; gap: var(--space-2); }

.menu-toggle { display: none; }
.js .menu-toggle { display: inline-flex; }

.site-nav ul { list-style: none; margin: 0; padding: 0; }
.site-nav li + li { margin-top: 0; }
.site-nav a {
  display: flex;
  align-items: center;
  min-height: 48px;
  padding: 0 var(--space-4);
  color: var(--color-text);
  text-decoration: none;
  font-weight: 500;
  border-radius: var(--radius-control);
}
.site-nav a:hover { color: var(--color-accent); }
.site-nav a[aria-current="page"] {
  color: var(--color-accent);
  box-shadow: inset 3px 0 0 var(--color-accent);
}

/* Mobile layout: panel drops below the header. Without JS the links simply stack in the page flow. */
@media (max-width: 1023px) {
  .header-bar { flex-wrap: wrap; }
  .site-nav { flex-basis: 100%; order: 10; }
  .js .site-nav {
    display: none;
    position: absolute;
    left: 0; right: 0; top: 100%;
    padding: var(--space-3) var(--gutter) var(--space-4);
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.35);
    max-height: calc(100dvh - var(--header-h));
    overflow-y: auto;
  }
  .js .site-nav.is-open { display: block; }
}
@media (min-width: 1024px) {
  .header-bar { gap: var(--space-5); }
  .brand { margin-right: 0; }
  .site-nav { margin-inline: auto; }
  .site-nav ul { display: flex; gap: var(--space-1); }
  .site-nav a { min-height: 44px; padding: 0 var(--space-3); }
  .site-nav a[aria-current="page"] { box-shadow: inset 0 -3px 0 var(--color-accent); border-radius: var(--radius-control) var(--radius-control) 0 0; }
  .js .menu-toggle { display: none; }
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  min-height: 44px;
  padding: 0 var(--space-5);
  border: 2px solid transparent;
  border-radius: var(--radius-control);
  font: inherit;
  font-weight: 600;
  line-height: 1.2;
  text-decoration: none;
  text-align: center;
  cursor: pointer;
  transition: background-color 0.15s, border-color 0.15s, color 0.15s;
}
.btn--lg { min-height: 52px; padding: 0 var(--space-6); font-size: 1.0625rem; }
.btn--primary { background: var(--gradient-cta); color: var(--color-bg); }
.btn--primary:hover { color: var(--color-bg); filter: brightness(1.08); }
.btn--secondary { background: transparent; color: var(--color-text); border-color: var(--control-border); }
.btn--secondary:hover { color: var(--color-accent); border-color: var(--color-accent); }
.btn--block { width: 100%; }
.btn[disabled], .btn[aria-disabled="true"] { opacity: 0.6; cursor: not-allowed; }
.btn svg { width: 20px; height: 20px; flex: none; }
.btn-row { display: flex; flex-wrap: wrap; gap: var(--space-3); }
@media (max-width: 479px) { .btn-row .btn { flex: 1 1 100%; } }
.header-actions .btn { min-height: 40px; padding: 0 var(--space-4); }
.header-actions .menu-toggle { min-height: 40px; padding: 0 var(--space-3); }

/* ---------- Cards ---------- */
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: var(--space-5);
}
.card > :last-child { margin-bottom: 0; }

.grid { display: grid; gap: var(--space-4); grid-template-columns: minmax(0, 1fr); }
@media (min-width: 768px) {
  .grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .grid { gap: var(--space-5); }
}
@media (min-width: 768px) and (max-width: 1023px) {
  .grid--3.grid--modes { grid-template-columns: minmax(0, 1fr); }
}

.mode-card { display: flex; flex-direction: column; gap: var(--space-3); position: relative; }
.mode-card h3 { margin: 0; }
.mode-card p { margin: 0; color: var(--color-text-muted); }
.mode-card .btn { margin-top: auto; }
.mode-card .mode-body { flex: 1; display: flex; flex-direction: column; gap: var(--space-3); }
.icon-badge {
  display: inline-grid; place-items: center;
  width: 48px; height: 48px;
  border-radius: var(--radius-card);
  background: var(--gradient-selected);
  border: 1px solid var(--color-border);
  color: var(--color-accent);
}
.icon-badge svg { width: 26px; height: 26px; }
.mode-card--online .icon-badge { color: var(--color-accent); }
.mode-card--robot .icon-badge { color: #aab6ff; }
.mode-card--local .icon-badge { color: var(--color-text); }

.badge {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 2px 10px;
  border: 1px solid var(--control-border);
  border-radius: 999px;
  font-size: 0.8125rem; font-weight: 600;
  color: var(--color-text-muted);
  white-space: nowrap;
}
.mode-card .badge { align-self: flex-start; }

.private-strip {
  position: relative;
  display: flex; flex-direction: column; gap: var(--space-4);
  padding: var(--space-5);
  border: 1px solid rgba(66, 217, 245, 0.45);
  border-radius: var(--radius-panel);
  background:
    radial-gradient(70% 140% at 0% 0%, rgba(66, 217, 245, 0.14), transparent 60%),
    radial-gradient(60% 140% at 100% 100%, rgba(82, 103, 242, 0.22), transparent 65%),
    var(--color-surface);
  box-shadow: 0 10px 40px rgba(82, 103, 242, 0.18), inset 0 1px 0 rgba(255, 255, 255, 0.06);
  overflow: hidden;
}
.private-strip::before {
  content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 4px;
  background: var(--gradient-cta);
}
.private-strip .private-strip__icon { width: 56px; height: 56px; flex: none; border-color: rgba(66, 217, 245, 0.45); }
.private-strip .private-strip__icon svg { width: 30px; height: 30px; }
.private-strip .eyebrow { margin: 0 0 var(--space-1); font-size: 0.8125rem; }
.private-strip h2, .private-strip h3 { font-size: clamp(1.5rem, 1.2rem + 1.4vw, 2rem); margin-bottom: var(--space-2); }
.private-strip p { margin: 0; color: var(--color-text-muted); }
.private-strip .private-strip__text { color: #b4c3da; max-width: 40em; }
.chip-list { display: flex; flex-wrap: wrap; gap: var(--space-2); list-style: none; margin: var(--space-4) 0 0; padding: 0; }
.chip-list li {
  display: inline-flex; align-items: center; gap: 6px; margin: 0;
  padding: 4px 12px; border-radius: 999px;
  background: rgba(66, 217, 245, 0.1); border: 1px solid rgba(66, 217, 245, 0.35);
  color: var(--color-text); font-size: 0.875rem; font-weight: 500;
}
.chip-list svg { width: 16px; height: 16px; color: var(--color-accent); }
.private-strip__actions .btn { box-shadow: 0 6px 20px rgba(0, 0, 0, 0.25); }
.private-strip__actions .btn--primary { box-shadow: 0 6px 24px rgba(66, 217, 245, 0.35); }
.private-strip__actions .btn--secondary { background: rgba(11, 18, 32, 0.6); }
.private-strip__actions .btn:hover { transform: translateY(-1px); }
.private-strip__actions .btn { transition: background-color 0.15s, border-color 0.15s, color 0.15s, transform 0.15s; }
@media (prefers-reduced-motion: reduce) { .private-strip__actions .btn:hover { transform: none; } }
@media (min-width: 768px) {
  .private-strip { flex-direction: row; align-items: center; gap: var(--space-5); padding: var(--space-6) var(--space-6) var(--space-6) calc(var(--space-6) + 4px); }
  .private-strip__body { flex: 1; min-width: 0; }
  .private-strip__actions { flex: none; flex-direction: column; flex-wrap: nowrap; min-width: 220px; }
  .private-strip__actions .btn { width: 100%; }
}

/* ---------- Hero ---------- */
.hero { padding-block: var(--space-7) var(--space-8); background: radial-gradient(60% 60% at 80% 30%, rgba(82, 103, 242, 0.14), transparent 70%); }
.hero-grid { display: grid; gap: var(--space-6); align-items: center; grid-template-columns: minmax(0, 1fr); }
.hero .lead { margin-bottom: var(--space-5); max-width: 36em; }
.hero-board { width: min(100%, 460px); margin-inline: auto; }
@media (min-width: 1024px) {
  .hero { padding-block: var(--space-9); }
  .hero-grid { grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr); gap: var(--space-8); }
}

.board-art { display: block; width: 100%; height: auto; aspect-ratio: 1 / 1; border-radius: var(--radius-panel); }

/* ---------- Steps / features ---------- */
.steps { list-style: none; padding: 0; margin: 0 0 var(--space-5); display: grid; gap: var(--space-4); counter-reset: step; }
.steps li { counter-increment: step; position: relative; padding-left: 52px; margin: 0; }
.steps li::before {
  content: counter(step);
  position: absolute; left: 0; top: 0;
  width: 36px; height: 36px; border-radius: 50%;
  display: grid; place-items: center;
  background: var(--gradient-selected); border: 1px solid var(--control-border);
  font-weight: 700; color: var(--color-accent);
}
.steps strong { display: block; }

.feature-list { list-style: none; padding: 0; margin: 0; display: grid; gap: var(--space-4); grid-template-columns: minmax(0, 1fr); }
@media (min-width: 768px) { .feature-list { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
.feature-list li { margin: 0; display: flex; gap: var(--space-3); align-items: flex-start; }
.feature-list svg { width: 24px; height: 24px; flex: none; color: var(--color-accent); margin-top: 2px; }
.feature-list strong { display: block; }

.planned { margin-top: var(--space-5); }

/* ---------- FAQ ---------- */
.faq details { background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius-card); }
.faq details + details { margin-top: var(--space-3); }
.faq summary {
  list-style: none; cursor: pointer;
  display: flex; align-items: center; justify-content: space-between; gap: var(--space-4);
  min-height: 52px; padding: var(--space-3) var(--space-5);
  font-weight: 600;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; flex: none; font-size: 1.5rem; line-height: 1; color: var(--color-accent); }
.faq details[open] summary::after { content: "\2212"; }
.faq .answer { padding: 0 var(--space-5) var(--space-4); color: var(--color-text-muted); }
.faq .answer p:last-child { margin: 0; }

/* ---------- Articles ---------- */
.page-head { padding-block: var(--space-7) var(--space-5); border-bottom: 1px solid var(--color-border); }
.page-head .lead { margin: 0; max-width: 40em; }
.breadcrumbs { margin-bottom: var(--space-4); font-size: 0.875rem; color: var(--color-text-muted); }
.breadcrumbs ol { list-style: none; display: flex; flex-wrap: wrap; gap: var(--space-2); padding: 0; margin: 0; }
.breadcrumbs li { margin: 0; }
.breadcrumbs li + li::before { content: "/"; margin-right: var(--space-2); color: var(--control-border); }
.breadcrumbs a { color: var(--color-text-muted); }
.breadcrumbs a:hover { color: var(--color-accent); }

.article-layout { display: grid; gap: var(--space-6); padding-block: var(--space-6) var(--space-8); grid-template-columns: minmax(0, 1fr); }
@media (min-width: 1024px) {
  .article-layout { grid-template-columns: 240px minmax(0, var(--prose)); gap: var(--space-8); justify-content: start; }
  .toc { position: sticky; top: calc(var(--header-h) + var(--space-5)); align-self: start; }
}
.toc { background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius-card); }
.toc summary { cursor: pointer; padding: var(--space-3) var(--space-4); font-weight: 600; min-height: 48px; display: flex; align-items: center; }
.toc ol { list-style: none; padding: 0 var(--space-4) var(--space-3); margin: 0; }
.toc a { display: block; padding: var(--space-2) 0; color: var(--color-text-muted); text-decoration: none; }
.toc a:hover { color: var(--color-accent); }
@media (min-width: 1024px) { .toc summary { pointer-events: none; } .toc summary::marker { content: ""; } }

.article section + section { margin-top: var(--space-7); }
.article h3 { margin-top: var(--space-5); }

/* Utilities (no inline styles, so the CSP can stay strict) */
[hidden] { display: none !important; }
.mt-4 { margin-top: var(--space-4); }
.mt-6 { margin-top: var(--space-6); }
.h-sm { font-size: 1.125rem; }
.spacer { height: var(--space-4); }
.pad-page { padding-block: var(--space-6) var(--space-8); }
.pad-room { padding-block: var(--space-7); }
.narrow { max-width: 640px; }
.notice h1 { font-size: 1.25rem; margin-bottom: var(--space-2); }
.article figure { margin: var(--space-5) 0; }
.article figure .board-art { max-width: 360px; }
.article figcaption { margin-top: var(--space-2); font-size: 0.875rem; color: var(--color-text-muted); }
.figure-pair { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: var(--space-4); margin: var(--space-5) 0; }
.article .figure-pair figure { margin: 0; }
.article .figure-pair figure .board-art { max-width: 100%; }
.callout { border-left: 4px solid var(--color-accent-2); background: var(--color-surface); padding: var(--space-4) var(--space-5); border-radius: 0 var(--radius-card) var(--radius-card) 0; margin: var(--space-5) 0; }
.callout > :last-child { margin-bottom: 0; }
.callout--draft { border-left-color: var(--color-danger); }
.article table { width: 100%; border-collapse: collapse; margin-bottom: var(--space-5); }
.article th, .article td { text-align: left; padding: var(--space-3); border-bottom: 1px solid var(--color-border); vertical-align: top; }
.article th { color: var(--color-text-muted); font-size: 0.875rem; font-weight: 600; }
.table-wrap { overflow-x: auto; }
.cta-panel { margin-top: var(--space-7); text-align: left; }
.cta-panel h2 { margin-top: 0; font-size: 1.5rem; }
.related { margin-top: var(--space-6); }
.related ul { list-style: none; padding: 0; display: grid; gap: var(--space-3); }
.related li { margin: 0; }

/* ---------- Forms ---------- */
.field { margin-bottom: var(--space-4); }
.field label, .fieldset legend { display: block; font-weight: 600; margin-bottom: var(--space-2); padding: 0; }
.field .hint { display: block; margin-top: var(--space-2); font-size: 0.875rem; color: var(--color-text-muted); }
.input {
  width: 100%; min-height: 48px; padding: 0 var(--space-4);
  background: var(--color-bg); color: var(--color-text);
  border: 2px solid var(--control-border); border-radius: var(--radius-control);
  font: inherit;
}
.input::placeholder { color: var(--color-text-muted); opacity: 0.8; }
.input:focus-visible { outline-offset: 0; border-color: var(--color-accent); }
.input[aria-invalid="true"] { border-color: var(--color-danger); }
.input--code { letter-spacing: 0.25em; text-transform: uppercase; font-variant-numeric: tabular-nums; font-weight: 600; }
.field-error { margin-top: var(--space-2); font-size: 0.9375rem; color: var(--color-danger); display: flex; gap: var(--space-2); }
.field-error[hidden] { display: none; }
.fieldset { border: 0; padding: 0; margin: 0 0 var(--space-4); min-width: 0; }

.choice-group { display: grid; gap: var(--space-3); }
.choice { position: relative; }
.choice input { position: absolute; opacity: 0; inset: 0; width: 100%; height: 100%; margin: 0; cursor: pointer; z-index: 1; }
.choice-body {
  display: grid; grid-template-columns: 28px 1fr; column-gap: var(--space-3);
  padding: var(--space-4);
  background: var(--color-surface); border: 2px solid var(--control-border); border-radius: var(--radius-card);
}
.choice-body .check { width: 24px; height: 24px; border-radius: 50%; border: 2px solid var(--control-border); display: grid; place-items: center; margin-top: 2px; }
.choice-body .check svg { width: 14px; height: 14px; opacity: 0; color: var(--color-bg); }
.choice-title { font-weight: 600; }
.choice-desc { color: var(--color-text-muted); font-size: 0.9375rem; line-height: 1.5; }
.choice input:checked + .choice-body { border-color: var(--color-accent); background: var(--gradient-selected); }
.choice input:checked + .choice-body .check { background: var(--color-accent); border-color: var(--color-accent); }
.choice input:checked + .choice-body .check svg { opacity: 1; }
.choice input:focus-visible + .choice-body { outline: 3px solid var(--color-accent); outline-offset: 2px; }
.choice-state { display: none; }
.choice input:checked + .choice-body .choice-state { display: inline; color: var(--color-accent); font-weight: 600; font-size: 0.875rem; margin-left: var(--space-2); }

/* Notices */
.notice { display: flex; gap: var(--space-3); padding: var(--space-4); border: 1px solid var(--control-border); border-radius: var(--radius-card); background: var(--color-surface); margin-bottom: var(--space-4); }
.notice[hidden] { display: none; }
.notice svg { width: 24px; height: 24px; flex: none; color: var(--color-accent); }
.notice--error svg { color: var(--color-danger); }
.notice--error { border-color: var(--color-danger); }
.notice > div > :last-child { margin-bottom: 0; }
.notice h2, .notice h3 { font-size: 1.0625rem; margin-bottom: var(--space-1); }

/* ---------- Play stage ---------- */
.stage { display: grid; gap: var(--space-5); padding-block: var(--space-6) var(--space-8); grid-template-columns: minmax(0, 1fr); }
.stage-panel { max-width: 520px; }
.stage-board { width: min(100%, 560px, calc(100dvh - var(--header-h) - 2 * var(--space-5))); margin-inline: auto; }
.stage-board .board-art { background: var(--color-surface); border: 1px solid var(--color-border); }
@media (min-width: 900px) {
  .stage { grid-template-columns: minmax(0, 420px) minmax(0, 1fr); gap: var(--space-7); align-items: start; }
  .stage-board { margin-inline: 0; }
}
.status-line { display: flex; align-items: center; gap: var(--space-3); padding: var(--space-3) var(--space-4); border: 1px solid var(--color-border); border-radius: var(--radius-control); background: var(--color-surface); margin-bottom: var(--space-4); font-size: 0.9375rem; }
.status-dot { width: 12px; height: 12px; flex: none; border-radius: 50%; border: 2px solid var(--color-text-muted); }
.status-dot--ok { background: var(--color-success); border-color: var(--color-success); }
.status-dot--wait { border-style: dashed; border-color: var(--color-accent); }

.code-box { display: flex; flex-wrap: wrap; gap: var(--space-3); align-items: center; margin-bottom: var(--space-4); }
.code-box .value { flex: 1 1 200px; min-width: 0; padding: var(--space-3) var(--space-4); background: var(--color-bg); border: 2px solid var(--control-border); border-radius: var(--radius-control); font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; overflow-wrap: anywhere; }
.code-box .value--big { font-size: 1.5rem; letter-spacing: 0.25em; font-weight: 700; }
.room-actions { margin-top: var(--space-5); }
.preview-note { margin-top: var(--space-6); }

/* ---------- Game screen ---------- */
.sr-only { position: absolute; width: 1px; height: 1px; margin: -1px; padding: 0; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0; }
.game-wrap { padding-block: var(--space-4) var(--space-7); }
.game-layout { display: grid; gap: var(--space-3); grid-template-columns: minmax(0, 1fr); align-items: start; }
.game-board { order: 3; width: min(100%, calc(100dvh - var(--header-h) - 150px)); min-width: min(100%, 288px); margin-inline: auto; }
.game-side { display: contents; }
.game-side > * { order: 5; margin: 0; }
.game-side > .game-banner { order: 0; }
.game-side > .turn-bar { order: 1; }
.game-side > .turn-timer { order: 1; }
.game-side > .players { order: 2; }
.game-side > .result { order: 4; }
@media (min-width: 900px) {
  .game-layout { grid-template-columns: minmax(0, min(calc(100dvh - var(--header-h) - 40px), 760px)) minmax(280px, 1fr); gap: var(--space-6); }
  .game-board { order: 0; width: 100%; margin: 0; }
  .game-side { display: flex; flex-direction: column; gap: var(--space-4); }
  .game-side > * { order: 0 !important; }
}
.board { display: block; width: 100%; height: auto; aspect-ratio: 1 / 1; border-radius: var(--radius-panel); touch-action: manipulation; user-select: none; -webkit-user-select: none; -webkit-tap-highlight-color: transparent; cursor: pointer; }
.board:focus-visible { outline: 3px solid var(--color-accent); outline-offset: 3px; }
.turn-bar { font-size: 1.25rem; font-weight: 600; padding: var(--space-3) var(--space-4); border: 1px solid var(--color-border); border-radius: var(--radius-card); background: var(--color-surface); }
.turn-timer { display: flex; align-items: center; gap: var(--space-3); font-weight: 600; font-variant-numeric: tabular-nums; }
.turn-timer[hidden] { display: none; }
.turn-timer-text { flex: none; min-width: 9ch; }
.turn-timer-bar { flex: 1; height: 8px; border-radius: 4px; background: var(--color-border); overflow: hidden; }
.turn-timer-fill { display: block; height: 100%; width: 100%; background: var(--color-accent); transition: width 0.25s linear; }
.turn-timer.is-low { color: #ff8a96; }
.turn-timer.is-low .turn-timer-fill { background: #ff8a96; }
.turn-bar:focus-visible { outline: 3px solid var(--color-accent); outline-offset: 2px; }
.players { list-style: none; padding: 0; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--space-3); }
.player-card { display: flex; flex-wrap: wrap; align-items: center; gap: var(--space-2) var(--space-3); margin: 0; padding: var(--space-3); border: 1px solid var(--color-border); border-radius: var(--radius-card); background: var(--color-surface); min-width: 0; }
.player-card.is-active { border: 3px solid var(--color-accent); padding: calc(var(--space-3) - 2px); }
.player-card.is-winner { border: 3px solid var(--color-success); padding: calc(var(--space-3) - 2px); }
.pawn-glyph { flex: none; width: 24px; height: 24px; border-radius: 50%; }
.pawn-glyph--0 { background: var(--color-accent); }
.pawn-glyph--1 { background: var(--color-player-2); }
.player-text { flex: 1 1 5em; min-width: 0; overflow-wrap: anywhere; font-weight: 600; }
.player-tag { color: var(--color-text-muted); font-weight: 400; }
.player-walls { flex: 1 0 100%; font-size: 0.875rem; color: var(--color-text-muted); }
.btn--toggle[aria-pressed="true"] { border-color: var(--color-accent); box-shadow: inset 0 0 0 1px var(--color-accent); background: rgba(66, 217, 245, 0.12); }
.btn--toggle[aria-pressed="true"]::before { content: "\2713"; color: var(--color-accent); font-weight: 700; }
.game-side .btn-row .btn { flex: 1 1 auto; }
.game-hint { min-height: 1.5em; }
.game-keys { display: none; }
@media (hover: hover) and (pointer: fine) { .game-keys { display: block; } }
.move-log-wrap summary { cursor: pointer; font-weight: 600; min-height: 44px; display: flex; align-items: center; }
.move-log { max-height: 220px; overflow: auto; margin: 0; padding-left: 2.25em; font-variant-numeric: tabular-nums; color: var(--color-text-muted); font-size: 0.9375rem; }
.move-log li { margin: 0; }
.move-log li + li { margin-top: 2px; }
.result { border-color: var(--color-accent); }
.result h2 { font-size: 1.5rem; margin-bottom: var(--space-2); }
.result h2:focus-visible { outline: 3px solid var(--color-accent); outline-offset: 2px; }
.game-banner { margin-bottom: 0; border-color: var(--color-danger); }

/* Searching for an online opponent */
.search-state { padding: var(--space-4); border: 1px solid var(--control-border); border-radius: var(--radius-card); background: var(--color-surface); margin-bottom: var(--space-4); }
.search-line { display: flex; align-items: center; gap: var(--space-3); flex-wrap: wrap; }
.spinner { flex: none; width: 20px; height: 20px; border-radius: 50%; border: 3px solid var(--color-border); border-top-color: var(--color-accent); }
.search-elapsed { color: var(--color-text-muted); font-variant-numeric: tabular-nums; }
.search-state .btn-row { margin-top: var(--space-3); }
.is-searching .field, .is-searching .status-line { display: none; }
.is-game .stage-panel { max-width: none; }
.pad-room.is-game { max-width: none; }

@media (prefers-reduced-motion: no-preference) {
  .spinner { animation: spin 0.9s linear infinite; }
  .turn-bar.flash { animation: turn-flash 0.7s ease-out; }
  @keyframes spin { to { transform: rotate(360deg); } }
  @keyframes turn-flash { from { box-shadow: 0 0 0 4px var(--color-accent); } to { box-shadow: 0 0 0 0 transparent; } }
}

/* ---------- 404 ---------- */
.notfound { text-align: center; padding-block: var(--space-8); }
.notfound .board-art { max-width: 280px; margin: 0 auto var(--space-5); }
.notfound .btn-row { justify-content: center; }
.notfound p { max-width: 32em; margin-inline: auto; margin-bottom: var(--space-5); }
.notfound-nav { margin-top: var(--space-7); }
.notfound-nav h2 { margin-bottom: var(--space-4); }
.notfound-nav ul { list-style: none; padding: 0; margin: 0 auto; max-width: 56rem; display: grid; gap: var(--space-3); grid-template-columns: minmax(0, 1fr); }
@media (min-width: 600px) { .notfound-nav ul { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (min-width: 960px) { .notfound-nav ul { grid-template-columns: repeat(4, minmax(0, 1fr)); } }
.notfound-nav li { margin: 0; }
.notfound-link { display: flex; flex-direction: column; gap: var(--space-1); height: 100%; text-align: left; text-decoration: none; color: var(--color-text); }
.notfound-link:hover, .notfound-link:focus-visible { border-color: var(--color-accent); }
.notfound .notfound-link span { font-size: 0.9375rem; }

/* ---------- Footer ---------- */
.site-footer { margin-top: auto; background: var(--color-surface); border-top: 1px solid var(--color-border); padding-block: var(--space-7) var(--space-5); }
.footer-grid { display: grid; gap: var(--space-6); grid-template-columns: minmax(0, 1fr); }
@media (min-width: 768px) { .footer-grid { grid-template-columns: minmax(0, 1.4fr) repeat(3, minmax(0, 1fr)); } }
.site-footer h2 { font-size: 0.875rem; text-transform: uppercase; letter-spacing: 0.08em; color: var(--color-text-muted); margin-bottom: var(--space-3); }
.site-footer ul { list-style: none; padding: 0; margin: 0; }
.site-footer li { margin: 0; }
.site-footer li a { display: inline-flex; align-items: center; min-height: 44px; color: var(--color-text); text-decoration: none; }
.site-footer li a:hover { color: var(--color-accent); text-decoration: underline; }
.footer-brand p { color: var(--color-text-muted); max-width: 22em; }
.footer-legal { margin-top: var(--space-6); padding-top: var(--space-5); border-top: 1px solid var(--color-border); color: var(--color-text-muted); font-size: 0.875rem; }
.footer-legal p { margin: 0 0 var(--space-2); }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition: none !important; animation: none !important; scroll-behavior: auto !important; }
}

.article .cta-panel { margin-top: var(--space-5); }

/* Contact form */
.input--area { min-height: 160px; padding: var(--space-3) var(--space-4); resize: vertical; line-height: 1.5; }
select.input { cursor: pointer; }
.check-line { display: flex; align-items: flex-start; gap: var(--space-3); font-weight: 400; cursor: pointer; }
.check-line input { width: 20px; height: 20px; margin-top: 2px; flex: none; accent-color: var(--color-accent); }
.contact-form { margin: var(--space-5) 0 var(--space-6); }
.contact-form .btn { margin-top: var(--space-2); }
.contact-status { margin-top: var(--space-4); }