:root {
  color-scheme: dark;
  --obsidian: #050609;
  --obsidian-soft: #0c0f15;
  --glass: rgba(11, 14, 20, 0.82);
  --ivory: #eee4cf;
  --ivory-muted: #b9ad96;
  --gold: #b78a3d;
  --gold-bright: #e1bd70;
  --gold-dark: #73501e;
  --blue-focus: #8fc9ff;
  --danger: #e17d73;
  --shadow: 0 24px 80px rgba(0, 0, 0, 0.58);
  font-family: Georgia, "Times New Roman", serif;
}

* { box-sizing: border-box; }

html, body {
  width: 100%;
  min-height: 100%;
  margin: 0;
  overflow: hidden;
  background: var(--obsidian);
  color: var(--ivory);
}

body {
  min-height: 100dvh;
  background:
    radial-gradient(circle at 50% -10%, rgba(80, 102, 145, 0.18), transparent 42%),
    radial-gradient(circle at 15% 110%, rgba(137, 89, 24, 0.11), transparent 36%),
    #050609;
}

button, input { font: inherit; }

button {
  min-height: 44px;
  border: 1px solid rgba(183, 138, 61, 0.48);
  border-radius: 3px;
  padding: 0.72rem 1rem;
  color: var(--ivory);
  background: linear-gradient(180deg, rgba(31, 34, 42, 0.96), rgba(10, 12, 17, 0.96));
  box-shadow: inset 0 1px rgba(255, 255, 255, 0.05), 0 7px 18px rgba(0, 0, 0, 0.28);
  cursor: pointer;
  transition: border-color 160ms ease, color 160ms ease, transform 160ms ease, background 160ms ease;
}

button:hover { border-color: var(--gold-bright); color: #fff5dc; }
button:active { transform: translateY(1px); }
button:focus-visible, [tabindex]:focus-visible {
  outline: 3px solid var(--blue-focus);
  outline-offset: 3px;
}
button:disabled { opacity: 0.42; cursor: not-allowed; }

.game-shell { position: relative; width: 100vw; height: 100dvh; isolation: isolate; }

.board-viewport {
  position: absolute;
  inset: 0;
  min-width: 0;
  touch-action: none;
  transition: filter 350ms ease, transform 350ms ease;
}

.board-viewport canvas { display: block; width: 100%; height: 100%; }
.board-viewport.menu-blur { filter: blur(6px) brightness(0.52); transform: scale(1.025); }

.hud {
  position: fixed;
  z-index: 5;
  inset: max(0.65rem, env(safe-area-inset-top)) 0.7rem auto;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 0.75rem;
  padding: 0.55rem 0.7rem;
  border: 1px solid rgba(183, 138, 61, 0.35);
  background: linear-gradient(135deg, rgba(11, 14, 20, 0.9), rgba(5, 6, 9, 0.77));
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.32);
  backdrop-filter: blur(15px);
}

.brand-mini {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border: 1px solid var(--gold);
  color: var(--gold-bright);
  font-weight: 700;
  letter-spacing: -0.08em;
}
.brand-mini span { color: var(--ivory); }

.stats { display: flex; justify-content: center; gap: clamp(0.7rem, 3vw, 2.7rem); }
.stat { min-width: 5rem; text-align: center; }
.stat span { display: block; color: var(--ivory-muted); font-family: system-ui, sans-serif; font-size: 0.72rem; letter-spacing: 0.09em; text-transform: uppercase; }
.stat strong { display: block; margin-top: 0.08rem; color: var(--gold-bright); font-size: 1.18rem; font-variant-numeric: tabular-nums; }

.actions { display: flex; gap: 0.38rem; }
.icon-button { min-height: 38px; padding: 0.55rem 0.68rem; font-family: system-ui, sans-serif; font-size: 0.82rem; }

.main-menu {
  position: fixed;
  z-index: 10;
  inset: 0;
  display: grid;
  place-items: center;
  padding: 1rem;
  background: radial-gradient(circle, rgba(15, 18, 25, 0.22), rgba(0, 0, 0, 0.68));
}

.menu-panel {
  position: relative;
  width: min(92vw, 440px);
  padding: clamp(1.6rem, 5vw, 2.8rem);
  text-align: center;
  border: 1px solid rgba(201, 157, 79, 0.55);
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.035), transparent 35%),
    linear-gradient(155deg, rgba(15, 18, 25, 0.95), rgba(4, 5, 8, 0.97));
  box-shadow: var(--shadow), inset 0 0 0 5px rgba(0, 0, 0, 0.25);
  clip-path: polygon(14px 0, calc(100% - 14px) 0, 100% 14px, 100% calc(100% - 14px), calc(100% - 14px) 100%, 14px 100%, 0 calc(100% - 14px), 0 14px);
}

.menu-panel::before, .menu-panel::after {
  content: "";
  position: absolute;
  width: 44px;
  height: 44px;
  border: solid var(--gold-dark);
  pointer-events: none;
}
.menu-panel::before { inset: 10px auto auto 10px; border-width: 1px 0 0 1px; }
.menu-panel::after { inset: auto 10px 10px auto; border-width: 0 1px 1px 0; }

.monogram { display: grid; grid-template-columns: repeat(3, 11px); grid-template-rows: repeat(3, 11px); gap: 4px; justify-content: center; margin: 0 auto 1rem; transform: rotate(45deg); }
.monogram span { width: 11px; height: 11px; border-radius: 50%; background: linear-gradient(135deg, #fff7df, #b88a3d); box-shadow: 0 0 14px rgba(225, 189, 112, 0.4); }
.monogram span:nth-child(1) { grid-area: 1 / 2; }
.monogram span:nth-child(2) { grid-area: 2 / 1; }
.monogram span:nth-child(3) { grid-area: 2 / 2; }
.monogram span:nth-child(4) { grid-area: 2 / 3; }
.monogram span:nth-child(5) { grid-area: 3 / 2; }

.eyebrow { margin: 0 0 0.55rem; color: var(--gold); font-family: system-ui, sans-serif; font-size: 0.72rem; letter-spacing: 0.24em; }
h1 { margin: 0; font-size: clamp(3rem, 11vw, 5.4rem); font-weight: 400; line-height: 0.94; letter-spacing: -0.05em; text-shadow: 0 7px 25px #000; }
.gold-rule { width: 86px; height: 1px; margin: 1.2rem auto 1.45rem; background: linear-gradient(90deg, transparent, var(--gold-bright), transparent); }
.menu-buttons { display: grid; gap: 0.58rem; }
.primary-button { border-color: var(--gold-bright); color: #171005; background: linear-gradient(180deg, #e3c27d, #9a6c2b); font-weight: 700; text-shadow: 0 1px rgba(255,255,255,.25); }
.primary-button:hover { color: #050300; background: linear-gradient(180deg, #f2d89d, #b9863c); }
.quiet-button { border-color: rgba(183, 138, 61, 0.18); color: var(--ivory-muted); background: transparent; }
.login-note { margin: 1rem 0 0; color: #8d8578; font-family: system-ui, sans-serif; font-size: 0.78rem; }

.modal {
  width: min(92vw, 520px);
  max-height: min(86dvh, 720px);
  padding: clamp(1.3rem, 4vw, 2.2rem);
  overflow: auto;
  color: var(--ivory);
  border: 1px solid var(--gold);
  border-radius: 4px;
  background: linear-gradient(145deg, #11151d, #06070a);
  box-shadow: var(--shadow);
}
.modal::backdrop { background: rgba(0, 0, 0, 0.78); backdrop-filter: blur(5px); }
.modal h2 { margin: 0 0 1rem; color: var(--gold-bright); font-size: clamp(1.7rem, 6vw, 2.5rem); font-weight: 400; }
.modal p, .modal li, .settings-list label { font-family: system-ui, sans-serif; font-size: 1rem; line-height: 1.55; }
.modal-actions { display: grid; grid-template-columns: 1fr 1fr; gap: 0.7rem; margin-top: 1.3rem; }
.fine-print { color: var(--ivory-muted); font-size: 0.82rem !important; }
.result-stats { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0.55rem; margin: 1.15rem 0 0; }
.result-stats div { padding: 0.65rem; border: 1px solid rgba(183,138,61,.25); background: rgba(0,0,0,.22); }
.result-stats dt { color: var(--ivory-muted); font: .7rem/1.2 system-ui, sans-serif; letter-spacing: .08em; text-transform: uppercase; }
.result-stats dd { margin: .25rem 0 0; color: var(--gold-bright); font: 600 .95rem/1.25 system-ui, sans-serif; }
.result-modal.victory h2 { text-shadow: 0 0 22px rgba(225,189,112,.5); animation: victory-glow 1.8s ease-in-out 3; }
.analysis-summary { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: .55rem; margin: 1rem 0; }
.analysis-summary span { padding: .7rem; border: 1px solid rgba(183,138,61,.25); background: rgba(0,0,0,.2); font: .86rem/1.35 system-ui, sans-serif; text-align: center; }
.analysis-summary strong { display: block; color: var(--gold-bright); font-size: 1.15rem; }
.analysis-table-wrap { max-width: 100%; overflow-x: auto; }
.analysis-table { width: 100%; border-collapse: collapse; font: .88rem/1.35 system-ui, sans-serif; }
.analysis-table th, .analysis-table td { padding: .7rem .6rem; border-bottom: 1px solid rgba(183,138,61,.2); text-align: left; vertical-align: top; }
.analysis-table th { color: var(--ivory-muted); font-size: .72rem; letter-spacing: .06em; text-transform: uppercase; }
.assessment { display: inline-block; padding: .25rem .45rem; border: 1px solid currentColor; border-radius: 2px; }
.assessment-winning { color: #9fd9b2; }
.assessment-dead-end { color: #e7a39b; }
.assessment-unknown { color: #e3c27d; }

.demo-controls {
  position: fixed; z-index: 8; left: 50%; bottom: max(1rem, env(safe-area-inset-bottom)); transform: translateX(-50%);
  display: flex; align-items: center; gap: .55rem; padding: .55rem .65rem; border: 1px solid rgba(183,138,61,.55);
  background: var(--glass); box-shadow: var(--shadow); backdrop-filter: blur(14px); font: .82rem system-ui, sans-serif;
}
.demo-controls button { min-height: 38px; padding: .45rem .7rem; }
.game-toast {
  position: fixed; z-index: 20; left: 50%; bottom: max(1rem, env(safe-area-inset-bottom)); width: min(92vw, 620px);
  padding: .75rem 1rem; border: 1px solid rgba(183,138,61,.55); background: rgba(8,10,15,.94); color: var(--ivory);
  box-shadow: var(--shadow); font: .9rem/1.35 system-ui, sans-serif; text-align: center; pointer-events: none;
  opacity: 0; transform: translate(-50%, 12px); transition: opacity 180ms ease, transform 180ms ease;
}
.game-toast.visible { opacity: 1; transform: translate(-50%, 0); }

@keyframes victory-glow { 50% { color: #fff3ce; text-shadow: 0 0 36px rgba(225,189,112,.85); } }
.instructions { padding-left: 1.4rem; }
.settings-list { display: grid; gap: 0.85rem; margin: 1rem 0 1.5rem; }
.settings-list label { display: flex; align-items: center; justify-content: space-between; gap: 0.7rem; min-height: 44px; }
.settings-list input[type="checkbox"] { width: 21px; height: 21px; accent-color: var(--gold); }
.settings-list select, #auth-dialog input { min-height: 44px; border: 1px solid rgba(181,138,70,.45); border-radius: 9px; background: #090a0e; color: var(--ivory); padding: 9px 11px; font: inherit; }
#auth-dialog form { display: grid; gap: 9px; }
#auth-dialog label { margin-top: 5px; color: var(--ivory-dim); }
#auth-dialog input { width: 100%; }
.form-error { color: #ffb5ab; }

.fallback-board {
  position: absolute;
  left: 50%;
  top: 53%;
  width: min(86vw, 72dvh, 680px);
  aspect-ratio: 1;
  transform: translate(-50%, -50%);
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: clamp(3px, 0.7vw, 8px);
  padding: clamp(10px, 2vw, 22px);
  border: clamp(5px, 1vw, 10px) solid #6c4b1e;
  background: linear-gradient(145deg, #11151c, #040507 58%, #171b23);
  box-shadow: var(--shadow), inset 0 0 35px #000;
}
.fallback-cell { display: grid; place-items: center; aspect-ratio: 1; }
.fallback-cell.invalid { visibility: hidden; }
.fallback-cell button { position: relative; width: 100%; min-height: 0; aspect-ratio: 1; padding: 0; border-radius: 50%; border: 2px solid #6e5128; background: radial-gradient(circle at 42% 35%, #0d1118, #020304 70%); box-shadow: inset 0 5px 9px #000; }
.fallback-cell button.occupied::after { content: ""; position: absolute; inset: 10%; border-radius: 50%; background: radial-gradient(circle at 36% 28%, #fffaf0, #d7c9aa 55%, #92713c 100%); box-shadow: 0 6px 12px #000, inset 0 -3px 5px rgba(81, 56, 20, .35); }
.fallback-cell button.destination { border-color: var(--gold-bright); box-shadow: 0 0 0 4px rgba(225,189,112,.22), inset 0 5px 9px #000; }
.fallback-cell button.selected::after, .fallback-cell button.hint::after { box-shadow: 0 0 0 4px var(--gold-bright), 0 0 20px #b98234; }
.fallback-cell button.movable:not(.selected)::after { box-shadow: 0 0 0 3px rgba(74,151,211,.75), 0 6px 12px #000; }
.fallback-cell button.keyboard-focus { outline: 3px solid var(--blue-focus); outline-offset: 3px; }

.fatal-error { display: grid; place-content: center; min-height: 100dvh; padding: 2rem; text-align: center; }
.fatal-error h1 { font-size: 2rem; }

[hidden] { display: none !important; }
.hidden { display: none !important; }
.sr-only { 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; }

.high-contrast { --ivory-muted: #e4dbc7; --gold: #e3b85f; --gold-bright: #ffe098; }

@media (max-width: 850px) {
  .hud { grid-template-columns: auto 1fr; }
  .actions { grid-column: 1 / -1; justify-content: center; overflow-x: auto; scrollbar-width: none; }
  .actions::-webkit-scrollbar { display: none; }
  .icon-button { flex: 1 0 auto; }
  .game-toast { bottom: 5.2rem; }
  .fallback-board { top: 58%; }
}

@media (max-width: 520px) {
  .hud { inset-inline: 0.35rem; padding: 0.4rem; gap: 0.35rem; }
  .brand-mini { width: 36px; height: 36px; }
  .stats { justify-content: space-around; gap: 0.25rem; }
  .stat { min-width: auto; }
  .stat span { font-size: 0.64rem; }
  .stat strong { font-size: 1rem; }
  .actions { gap: 0.25rem; }
  .icon-button { padding: 0.5rem 0.52rem; font-size: 0.75rem; }
  .fallback-board { width: min(95vw, 70dvh); padding: 8px; }
  .fallback-cell button { border-width: 1px; }
  .menu-panel { padding: 1.55rem 1.3rem; }
  .modal-actions { grid-template-columns: 1fr; }
  .result-stats { grid-template-columns: 1fr; }
  .analysis-summary { grid-template-columns: 1fr; }
  .demo-controls { width: calc(100vw - .7rem); justify-content: center; }
}

@media (orientation: landscape) and (max-height: 600px) {
  .hud { inset: 0.35rem 0.4rem auto; grid-template-columns: auto minmax(260px, 1fr) auto; padding: 0.3rem 0.45rem; }
  .actions { grid-column: auto; }
  .brand-mini { width: 34px; height: 34px; }
  .icon-button { min-height: 34px; padding-block: 0.35rem; }
  .menu-panel { width: min(84vw, 620px); padding: 1rem 2rem; }
  .monogram { margin-bottom: 0.5rem; }
  h1 { font-size: 3.2rem; }
  .gold-rule { margin: 0.7rem auto; }
  .menu-buttons { grid-template-columns: 1fr 1fr; }
  .login-note { margin-top: 0.55rem; }
  .fallback-board { top: 55%; width: min(76vh, 76vw); }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition-duration: 0.01ms !important; animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; }
}