:root {
  color-scheme: dark;
  --ink: #eef8ff;
  --muted: #9fb5c6;
  --surface: rgba(9, 27, 43, 0.9);
  --line: rgba(152, 207, 229, 0.24);
  --aqua: #62e6cf;
  --yellow: #ffe889;
  --danger: #ffabab;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }
html { min-width: 320px; background: #06101b; }
body {
  min-height: 100vh;
  margin: 0;
  color: var(--ink);
  background: radial-gradient(circle at 12% 0%, #143952 0, transparent 36rem), linear-gradient(145deg, #07111f, #081a2a 52%, #050d17);
}
button, input, select { font: inherit; }
a { color: #a9e8df; }
p { color: var(--muted); }
.skip-link { position: fixed; z-index: 20; top: 0.5rem; left: 0.5rem; padding: 0.7rem; color: #06101b; background: white; transform: translateY(-150%); }
.skip-link:focus { transform: none; }
.page-shell { width: min(100% - 2rem, 1420px); margin: 0 auto; }

.site-header {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: 1rem;
  align-items: center;
  min-height: 6rem;
  border-bottom: 1px solid var(--line);
}
.site-header h1 { margin: 0.1rem 0; font-size: clamp(1.4rem, 3vw, 2.2rem); }
.tagline, .eyebrow { margin: 0; }
.eyebrow, .section-kicker, .status-strip > span, .player-board > div:first-child > span {
  color: var(--aqua);
  font-size: 0.68rem;
  font-weight: 850;
  letter-spacing: 0.11em;
  text-transform: uppercase;
}
.brand-mark { position: relative; width: 3.2rem; height: 3.2rem; border: 1px solid var(--line); border-radius: 1rem; background: #0c2940; }
.brand-mark span { position: absolute; width: 0.8rem; height: 0.8rem; background: var(--aqua); border-radius: 0.25rem; }
.brand-mark span:nth-child(1) { left: 0.55rem; top: 1.25rem; }
.brand-mark span:nth-child(2) { left: 1.25rem; top: 0.55rem; background: var(--yellow); }
.brand-mark span:nth-child(3) { right: 0.45rem; bottom: 0.5rem; background: #73d7ff; }
.offline-badge { margin: 0; padding: 0.48rem 0.7rem; color: #c8eadf; background: rgba(98,230,207,.08); border: 1px solid rgba(98,230,207,.22); border-radius: 999px; font-size: .7rem; }
.studio-link { grid-column: 3; font-size: .72rem; text-decoration: none; }

.setup-panel { display: grid; grid-template-columns: minmax(0, 1.2fr) minmax(310px, .8fr); gap: clamp(2rem, 8vw, 7rem); align-items: center; min-height: calc(100vh - 8rem); padding: 4rem 0; }
.setup-copy h2 { max-width: 14ch; margin: .35rem 0 1rem; font-size: clamp(2.2rem, 6vw, 5rem); line-height: .98; }
.setup-copy > p:last-child { max-width: 62ch; line-height: 1.7; }
.how-list { display: grid; gap: .8rem; max-width: 64ch; padding-left: 1.25rem; color: #dbe9f1; line-height: 1.55; }
.setup-card { padding: 1.35rem; background: linear-gradient(155deg, rgba(18,45,67,.96), rgba(6,19,31,.98)); border: 1px solid var(--line); border-radius: 1.3rem; box-shadow: 0 24px 70px rgba(0,0,0,.38); }
fieldset { margin: 0 0 1.2rem; padding: 0; border: 0; }
legend, .field-label { display: block; margin-bottom: .55rem; color: #dceaf2; font-size: .75rem; font-weight: 800; letter-spacing: .06em; text-transform: uppercase; }
.segmented { display: grid; grid-template-columns: 1fr 1fr; gap: .5rem; }
.segmented label { position: relative; }
.segmented input { position: absolute; opacity: 0; }
.segmented span { display: block; padding: .75rem; text-align: center; background: #071726; border: 1px solid var(--line); border-radius: .7rem; cursor: pointer; }
.segmented input:checked + span { color: #061714; background: var(--aqua); border-color: var(--aqua); font-weight: 850; }
.segmented input:focus-visible + span { outline: 3px solid var(--yellow); outline-offset: 3px; }
select, input[type="number"] { width: 100%; min-height: 2.85rem; padding: .65rem .8rem; color: var(--ink); background: #071522; border: 1px solid rgba(147,196,219,.35); border-radius: .7rem; }
select { margin-bottom: 1.1rem; }
.seed-row { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: .55rem; }
.field-help, .privacy-note { font-size: .74rem; line-height: 1.45; }
.field-help { margin: .45rem 0 1rem; }
.privacy-note { margin: .8rem 0 0; text-align: center; }

.button { min-height: 2.6rem; padding: .58rem .9rem; color: var(--ink); background: #132f47; border: 1px solid rgba(147,196,219,.3); border-radius: .7rem; font-weight: 780; cursor: pointer; }
.button:hover:not(:disabled) { background: #1b405d; border-color: rgba(147,219,226,.58); }
.button:focus-visible { outline: 3px solid var(--yellow); outline-offset: 2px; }
.button.primary { color: #06201e; background: linear-gradient(135deg, #7cf0dd, #45d0bb); border-color: transparent; }
.button.secondary { background: #102b42; }
.button.danger { color: #ffd1d1; border-color: rgba(255,154,154,.28); }
.start-button { width: 100%; }

.game-panel { padding: 1rem 0 1.5rem; scroll-margin-top: .5rem; }
.game-toolbar { display: flex; gap: 1rem; align-items: center; justify-content: space-between; margin-bottom: .7rem; }
.game-toolbar h2 { margin: 0; font-size: clamp(1.5rem, 3vw, 2.2rem); }
.toolbar-actions { display: flex; flex-wrap: wrap; gap: .4rem; justify-content: flex-end; }
.button.compact { min-height: 2.2rem; padding: .4rem .64rem; font-size: .73rem; }
.hud-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: .55rem; margin-bottom: .65rem; }
.hud-card { display: grid; grid-template-columns: 1fr auto; gap: .05rem .7rem; align-items: center; min-width: 0; padding: .72rem .85rem; background: rgba(10,29,46,.82); border: 1px solid var(--line); border-radius: .8rem; }
.hud-card span { color: #c5d7e2; font-size: .68rem; font-weight: 800; text-transform: uppercase; }
.hud-card strong { grid-row: 1 / 3; grid-column: 2; font-size: 1.3rem; }
.hud-card small { color: var(--muted); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.learner-card strong { color: var(--yellow); }

.arena-wrap { position: relative; min-width: 0; padding: .4rem; overflow: hidden; background: #030b13; border: 1px solid rgba(146,205,225,.3); border-radius: 1rem; box-shadow: 0 18px 48px rgba(0,0,0,.3); }
#arena-canvas { display: block; width: 100%; min-height: 390px; max-height: calc(100vh - 290px); aspect-ratio: 48 / 31; background: #071421; border-radius: .72rem; touch-action: none; }
.canvas-instructions { position: absolute; top: .85rem; left: .85rem; display: flex; gap: .35rem; flex-wrap: wrap; pointer-events: none; }
.canvas-instructions span { padding: .3rem .5rem; color: #d4e3ea; background: rgba(2,11,19,.82); border: 1px solid rgba(154,206,226,.22); border-radius: 999px; font-size: .62rem; }
.question-overlay { position: absolute; right: 1rem; bottom: 1rem; left: 1rem; max-width: 720px; margin: auto; padding: .65rem .8rem; text-align: center; background: rgba(5,17,28,.92); border: 1px solid rgba(255,232,137,.55); border-radius: .8rem; box-shadow: 0 12px 30px rgba(0,0,0,.4); pointer-events: none; }
.question-overlay[hidden] { display: none; }
.question-overlay p { margin: 0 0 .2rem; color: var(--yellow); font-size: .65rem; font-weight: 800; text-transform: uppercase; }
.question-overlay strong { display: block; font-size: clamp(.82rem, 2vw, 1.1rem); }
#question-options { display: flex; gap: .5rem; justify-content: center; margin-top: .35rem; color: #cfe0e9; font-size: .73rem; }

.capture-overlay { position: absolute; z-index: 4; inset: auto clamp(.75rem, 4vw, 2rem) clamp(.75rem, 4vw, 2rem); max-width: 760px; margin: auto; padding: clamp(.85rem, 2vw, 1.15rem); background: rgba(4,13,23,.96); border: 2px solid var(--yellow); border-radius: 1rem; box-shadow: 0 18px 50px rgba(0,0,0,.58), 0 0 28px rgba(255,232,137,.13); }
.capture-overlay[hidden] { display: none; }
.capture-heading { display: flex; gap: 1rem; align-items: center; justify-content: space-between; }
.capture-heading p { margin: 0; color: var(--yellow); font-size: .72rem; font-weight: 900; letter-spacing: .1em; text-transform: uppercase; }
.capture-heading strong { min-width: 4.3rem; color: #06101b; background: var(--yellow); border-radius: 999px; padding: .35rem .55rem; text-align: center; font-variant-numeric: tabular-nums; }
.capture-overlay h3 { margin: .55rem 0 .25rem; color: #fff; font-size: clamp(1rem, 3vw, 1.35rem); }
.capture-help { margin: 0 0 .65rem; font-size: .68rem; }
.capture-options { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: .55rem; }
.capture-choice { display: grid; grid-template-columns: auto minmax(0, 1fr); gap: .55rem; align-items: center; min-height: 3.5rem; padding: .55rem .7rem; color: #f5fbff; background: #102b42; border: 1px solid rgba(153,218,235,.42); border-radius: .75rem; text-align: left; cursor: pointer; }
.capture-choice span { display: grid; place-items: center; width: 1.8rem; height: 1.8rem; color: #06101b; background: var(--aqua); border-radius: .45rem; font-weight: 950; }
.capture-choice strong { overflow-wrap: anywhere; font-size: clamp(.82rem, 2vw, 1rem); }
.capture-choice:hover { background: #1a405b; }
.capture-choice:focus-visible { outline: 3px solid white; outline-offset: 2px; border-color: white; }

.under-game { display: grid; grid-template-columns: minmax(0, 1fr) minmax(380px, .8fr); gap: .65rem; margin-top: .65rem; }
.status-strip, .player-board { padding: .75rem .9rem; background: rgba(10,29,46,.76); border: 1px solid var(--line); border-radius: .8rem; }
.status-strip p { margin: .25rem 0 0; color: #dce9ef; font-size: .78rem; line-height: 1.45; }
.player-board { display: grid; grid-template-columns: auto minmax(0, 1fr); gap: .8rem; align-items: center; }
.player-board h3 { margin: .1rem 0 0; font-size: .9rem; }
.player-list { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: .35rem; }
.player-chip { min-width: 0; padding: .38rem .45rem; border: 1px solid var(--player-color); border-radius: .5rem; font-size: .65rem; }
.player-chip strong, .player-chip span { display: block; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.player-chip span { margin-top: .1rem; color: var(--muted); }
.player-chip.eliminated { opacity: .45; filter: grayscale(.8); text-decoration: line-through; }
.map-note { margin: .6rem .2rem 0; font-size: .68rem; line-height: 1.45; }

footer { padding: 1rem 0 1.5rem; border-top: 1px solid var(--line); font-size: .67rem; line-height: 1.5; }
footer p { margin: 0; }
dialog { width: min(620px, calc(100% - 1.5rem)); max-height: calc(100vh - 1.5rem); padding: 0; color: var(--ink); background: transparent; border: 0; }
dialog::backdrop { background: rgba(1,8,15,.82); backdrop-filter: blur(7px); }
.dialog-card { padding: clamp(1.2rem, 4vw, 2rem); background: linear-gradient(155deg, #14314a, #081723 75%); border: 1px solid rgba(151,213,229,.34); border-radius: 1rem; box-shadow: 0 24px 60px rgba(0,0,0,.4); }
.dialog-card h2 { margin: .35rem 0 .8rem; font-size: clamp(1.6rem, 5vw, 2.5rem); }
.dialog-card p, .dialog-card li { font-size: .8rem; line-height: 1.5; }
#result-ranking { display: grid; gap: .35rem; padding-left: 1.4rem; }
.result-limitation { color: var(--muted); }
.result-actions { display: flex; gap: .6rem; justify-content: flex-end; margin-top: 1rem; }

.reduced-motion *, .reduced-motion *::before, .reduced-motion *::after { scroll-behavior: auto !important; transition-duration: .001ms !important; animation-duration: .001ms !important; animation-iteration-count: 1 !important; }
@media (prefers-reduced-motion: reduce) { *, *::before, *::after { scroll-behavior: auto !important; transition-duration: .001ms !important; animation-duration: .001ms !important; animation-iteration-count: 1 !important; } }

@media (max-width: 900px) {
  .setup-panel { grid-template-columns: 1fr; min-height: 0; padding: 2.5rem 0; }
  .setup-copy h2 { max-width: 16ch; }
  .under-game { grid-template-columns: 1fr; }
  #arena-canvas { max-height: none; }
}
@media (max-width: 700px) {
  .page-shell { width: min(100% - 1rem, 1420px); }
  .site-header { grid-template-columns: auto 1fr; }
  .offline-badge { grid-column: 1 / -1; justify-self: start; }
  .studio-link { grid-column: 2; }
  .game-toolbar { align-items: flex-start; flex-direction: column; }
  .toolbar-actions { width: 100%; display: grid; grid-template-columns: repeat(2, minmax(0,1fr)); }
  .hud-grid { grid-template-columns: repeat(2, minmax(0,1fr)); }
  .player-board { grid-template-columns: 1fr; }
  #arena-canvas { min-height: 480px; aspect-ratio: 3 / 4; }
}
@media (max-width: 440px) {
  .hud-card { padding: .6rem; }
  .hud-card strong { font-size: 1.05rem; }
  .player-list { grid-template-columns: repeat(2, minmax(0,1fr)); }
  .result-actions { flex-direction: column; }
  #question-options { flex-direction: column; gap: .1rem; }
  .canvas-instructions { max-width: 135px; align-items: flex-start; flex-direction: column; }
  .canvas-instructions span { max-width: 135px; font-size: .55rem; line-height: 1.3; white-space: normal; }
  .canvas-instructions span:last-child { display: none; }
  .capture-options { grid-template-columns: 1fr; gap: .35rem; }
  .capture-choice { min-height: 3rem; }
  .capture-overlay { right: .55rem; left: .55rem; }
}