/* Aurum Chess — dark premium gold. Mobile-first, OKLCH palette. */
:root{
  --bg:oklch(0.16 0.012 70);
  --bg2:oklch(0.13 0.010 70);
  --surface:oklch(0.21 0.018 70);
  --gold:oklch(0.80 0.13 78);
  --gold-deep:oklch(0.68 0.12 70);
  --amber:oklch(0.85 0.15 75);
  --text:oklch(0.94 0.01 80);
  --muted:oklch(0.70 0.02 80);
  --danger:oklch(0.65 0.18 25);
  --win:oklch(0.80 0.14 150);
  --radius:16px;
  --safe-t:env(safe-area-inset-top,0px);
  --safe-b:env(safe-area-inset-bottom,0px);
  --font-d:"Fraunces",Georgia,serif;
  --font-u:"Hanken Grotesk",system-ui,sans-serif;
}
*{margin:0;padding:0;box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html,body{height:100%;overflow:hidden;background:var(--bg);color:var(--text);font-family:var(--font-u)}
body{position:fixed;inset:0;width:100%;height:100%;overscroll-behavior:none}
button{font-family:inherit;color:inherit;cursor:pointer;border:none;background:none}
.muted{color:var(--muted)}
.panel{
  background:color-mix(in oklch,var(--surface) 55%,transparent);
  backdrop-filter:blur(18px) saturate(1.1);-webkit-backdrop-filter:blur(18px) saturate(1.1);
  border:1px solid color-mix(in oklch,var(--gold) 18%,transparent);
  box-shadow:inset 0 1px 0 color-mix(in oklch,white 6%,transparent),0 24px 60px rgba(0,0,0,.5);
  border-radius:var(--radius);
}

/* ---------- POSTER (LCP) ---------- */
#poster{position:fixed;inset:0;z-index:100;display:grid;place-items:center;background:
  radial-gradient(120% 90% at 50% 0%,var(--bg2),var(--bg) 60%);transition:opacity .6s ease,visibility .6s}
#poster.hide{opacity:0;visibility:hidden;pointer-events:none}
.poster-glow{position:absolute;inset:0;background:
  radial-gradient(50% 40% at 50% 38%,color-mix(in oklch,var(--amber) 22%,transparent),transparent 70%);
  filter:blur(20px)}
.poster-inner{position:relative;text-align:center;padding:24px}
.logo-mark{font-size:clamp(56px,18vw,90px);color:var(--gold);line-height:1;filter:drop-shadow(0 0 24px color-mix(in oklch,var(--amber) 60%,transparent));animation:floaty 3.2s ease-in-out infinite}
.logo{font-family:var(--font-d);font-weight:700;font-size:clamp(44px,14vw,76px);letter-spacing:.14em;
  background:linear-gradient(180deg,var(--amber),var(--gold-deep));-webkit-background-clip:text;background-clip:text;color:transparent;margin-top:6px}
.tagline{font-size:11px;letter-spacing:.32em;color:var(--muted);margin-top:8px}
.loader{display:flex;gap:7px;justify-content:center;margin:26px 0 12px}
.loader span{width:9px;height:9px;border-radius:50%;background:var(--gold);animation:pulse 1.1s ease-in-out infinite}
.loader span:nth-child(2){animation-delay:.18s}.loader span:nth-child(3){animation-delay:.36s}
.load-status{font-size:12px;color:var(--muted);letter-spacing:.04em}
@keyframes pulse{0%,100%{opacity:.25;transform:scale(.8)}50%{opacity:1;transform:scale(1)}}
@keyframes floaty{0%,100%{transform:translateY(0)}50%{transform:translateY(-8px)}}

/* ---------- SCREENS ---------- */
.screen{position:fixed;inset:0;z-index:10}
[hidden]{display:none!important}

/* ---------- START ---------- */
#start{display:grid;place-items:center;padding:calc(16px + var(--safe-t)) 16px calc(16px + var(--safe-b));
  background:radial-gradient(120% 80% at 50% -10%,var(--bg2),var(--bg) 55%);overflow-y:auto}
.start-card{width:min(440px,100%);padding:26px 22px;display:flex;flex-direction:column;gap:14px}
.brand{display:flex;align-items:center;gap:10px;font-family:var(--font-d);font-weight:600;letter-spacing:.12em;font-size:15px;color:var(--gold)}
.brand-mark{font-size:22px}
.start-card h2{font-family:var(--font-d);font-weight:600;font-size:26px;letter-spacing:.01em}
.start-card .sub{color:var(--muted);font-size:14px;margin-top:-8px}
.level-meta{display:flex;align-items:center;gap:16px;margin-top:6px}
.level-num{font-family:var(--font-d);font-weight:700;font-size:48px;line-height:1;color:var(--gold);min-width:64px;text-align:center;
  text-shadow:0 0 28px color-mix(in oklch,var(--amber) 50%,transparent)}
.level-info{display:flex;flex-direction:column;gap:2px}
.level-info strong{font-size:18px}
.level-info .muted{font-size:13px}
input[type=range]{-webkit-appearance:none;appearance:none;width:100%;height:6px;border-radius:99px;
  background:linear-gradient(90deg,var(--gold),var(--gold-deep));outline:none}
input[type=range]::-webkit-slider-thumb{-webkit-appearance:none;width:28px;height:28px;border-radius:50%;
  background:radial-gradient(circle at 35% 30%,var(--amber),var(--gold-deep));border:2px solid var(--bg);
  box-shadow:0 0 0 4px color-mix(in oklch,var(--gold) 25%,transparent),0 4px 12px rgba(0,0,0,.5);cursor:pointer}
input[type=range]::-moz-range-thumb{width:28px;height:28px;border-radius:50%;background:var(--amber);border:2px solid var(--bg);cursor:pointer}
.pips{display:flex;gap:3px;justify-content:space-between;margin-top:-4px}
.pips i{flex:1;height:4px;border-radius:2px;background:color-mix(in oklch,var(--gold) 16%,transparent)}
.pips i.on{background:var(--gold)}
.row{display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap}
.row .label{font-size:13px;color:var(--muted);letter-spacing:.04em}
.seg{display:flex;gap:4px;background:color-mix(in oklch,var(--bg2) 80%,transparent);padding:4px;border-radius:12px;border:1px solid color-mix(in oklch,var(--gold) 12%,transparent)}
.seg-btn{padding:11px 14px;border-radius:9px;font-size:13px;font-weight:600;color:var(--muted);transition:.2s;min-height:44px}
.seg-btn.active{background:linear-gradient(180deg,var(--gold),var(--gold-deep));color:var(--bg2);box-shadow:0 2px 10px color-mix(in oklch,var(--gold) 35%,transparent)}
.toggles{justify-content:flex-start;gap:22px}
.tog{display:flex;align-items:center;gap:8px;font-size:14px;cursor:pointer}
.tog input{width:18px;height:18px;accent-color:var(--gold)}
.btn-primary{margin-top:8px;padding:16px;border-radius:14px;font-size:16px;font-weight:700;letter-spacing:.02em;
  background:linear-gradient(180deg,var(--amber),var(--gold-deep));color:#241a08;
  box-shadow:0 8px 24px color-mix(in oklch,var(--gold) 30%,transparent),inset 0 1px 0 rgba(255,255,255,.3);
  transition:transform .12s,filter .2s;min-height:54px}
.btn-primary:active{transform:scale(.98);filter:brightness(1.08)}
.btn-ghost{padding:14px;border-radius:12px;font-weight:600;color:var(--text);border:1px solid color-mix(in oklch,var(--gold) 22%,transparent)}

/* ---------- GAME ---------- */
#game{background:var(--bg)}
#scene{position:fixed;inset:0;width:100%;height:100%;display:block;touch-action:none}
.hud{position:fixed;left:0;right:0;z-index:20;display:flex;align-items:center;gap:12px;padding:12px 14px;pointer-events:none}
.hud>*{pointer-events:auto}
#hud-top{top:0;padding-top:calc(12px + var(--safe-t));
  background:linear-gradient(180deg,color-mix(in oklch,var(--bg) 80%,transparent),transparent)}
#hud-bottom{bottom:0;padding-bottom:calc(12px + var(--safe-b));justify-content:space-between;
  background:linear-gradient(0deg,color-mix(in oklch,var(--bg) 85%,transparent),transparent)}
.icon-btn{width:46px;height:46px;border-radius:13px;display:grid;place-items:center;font-size:19px;color:var(--text);
  background:color-mix(in oklch,var(--surface) 55%,transparent);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);
  border:1px solid color-mix(in oklch,var(--gold) 16%,transparent);transition:.15s}
.icon-btn:active{transform:scale(.92);background:color-mix(in oklch,var(--gold) 22%,transparent)}
.player{display:flex;flex-direction:column;gap:2px;font-size:13px}
.player.opp{flex:1}
.player.me{flex-direction:row;align-items:center;gap:8px}
.pname{font-family:var(--font-d);font-weight:600;font-size:15px}
.plevel{font-size:11px;color:var(--gold);letter-spacing:.06em}
.captured{font-size:14px;letter-spacing:-2px;color:var(--muted);min-height:16px}
.turn-ind{display:flex;align-items:center;gap:8px;padding:9px 14px;border-radius:99px;font-size:13px;font-weight:600;
  background:color-mix(in oklch,var(--surface) 55%,transparent);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);
  border:1px solid color-mix(in oklch,var(--gold) 20%,transparent)}
.turn-ind .dot{width:9px;height:9px;border-radius:50%;background:var(--gold);box-shadow:0 0 10px var(--gold)}
.turn-ind.yours{border-color:var(--gold);animation:breathe 2.4s ease-in-out infinite}
.turn-ind.thinking .dot{background:var(--amber);animation:blink .8s ease-in-out infinite}
.turn-ind.check{border-color:var(--danger);color:var(--danger)}
.turn-ind.check .dot{background:var(--danger);box-shadow:0 0 10px var(--danger)}
@keyframes breathe{0%,100%{box-shadow:0 0 0 0 color-mix(in oklch,var(--gold) 30%,transparent)}50%{box-shadow:0 0 0 6px color-mix(in oklch,var(--gold) 8%,transparent)}}
@keyframes blink{0%,100%{opacity:1}50%{opacity:.3}}
.controls{display:flex;gap:8px}

.coach-bubble{position:fixed;left:14px;right:14px;top:calc(76px + var(--safe-t));z-index:25;display:flex;gap:10px;align-items:flex-start;
  padding:13px 15px;border-radius:14px;
  background:color-mix(in oklch,var(--surface) 70%,transparent);backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);
  border:1px solid color-mix(in oklch,var(--gold) 22%,transparent);box-shadow:0 12px 30px rgba(0,0,0,.4);
  animation:slidein .35s ease;max-width:520px;margin:0 auto}
.coach-bubble .coach-ico{font-size:20px;color:var(--gold);flex-shrink:0}
.coach-bubble p{font-size:14px;line-height:1.4}
.coach-bubble.grade-blunder{border-color:var(--danger)}
.coach-bubble.grade-brilliant{border-color:var(--win)}
@keyframes slidein{from{opacity:0;transform:translateY(-10px)}to{opacity:1;transform:translateY(0)}}

/* History sheet */
.sheet{position:fixed;left:0;right:0;bottom:0;z-index:40;max-height:60vh;
  border-radius:20px 20px 0 0;padding:16px 16px calc(20px + var(--safe-b));
  background:color-mix(in oklch,var(--surface) 92%,transparent);backdrop-filter:blur(24px);-webkit-backdrop-filter:blur(24px);
  border-top:1px solid color-mix(in oklch,var(--gold) 22%,transparent);box-shadow:0 -20px 50px rgba(0,0,0,.6);
  animation:sheetup .3s ease;display:flex;flex-direction:column}
@keyframes sheetup{from{transform:translateY(100%)}to{transform:translateY(0)}}
.sheet-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:10px}
.sheet-head strong{font-family:var(--font-d);font-size:17px}
.history-list{overflow-y:auto;display:grid;grid-template-columns:auto 1fr 1fr;gap:2px 12px;font-variant-numeric:tabular-nums;font-size:14px;padding-right:4px}
.history-list .hno{color:var(--muted);text-align:right;padding:5px 0}
.history-list .hmv{padding:5px 8px;border-radius:6px;font-weight:500}
.history-list .hmv.cur{background:color-mix(in oklch,var(--gold) 18%,transparent);border-left:2px solid var(--gold)}

/* ---------- MODALS ---------- */
.modal{position:fixed;inset:0;z-index:60;display:grid;place-items:center;padding:20px;
  background:color-mix(in oklch,var(--bg) 70%,transparent);backdrop-filter:blur(6px);-webkit-backdrop-filter:blur(6px);animation:fade .25s}
@keyframes fade{from{opacity:0}to{opacity:1}}
.modal-card{width:min(380px,100%);padding:26px 22px;text-align:center;display:flex;flex-direction:column;gap:14px}
.modal-card h3{font-family:var(--font-d);font-weight:600;font-size:24px}
.promo-row{display:grid;grid-template-columns:repeat(4,1fr);gap:10px}
.promo-btn{display:flex;flex-direction:column;align-items:center;gap:4px;padding:14px 6px;border-radius:12px;font-size:30px;color:var(--gold);
  background:color-mix(in oklch,var(--bg2) 70%,transparent);border:1px solid color-mix(in oklch,var(--gold) 16%,transparent);transition:.15s;min-height:64px}
.promo-btn span{font-size:11px;color:var(--muted)}
.promo-btn:active{background:color-mix(in oklch,var(--gold) 25%,transparent);transform:scale(.95)}
.over-ico{font-size:54px;animation:floaty 3s ease-in-out infinite}
.over-actions{display:flex;flex-direction:column;gap:10px;margin-top:4px}

/* ---------- RESPONSIVE ---------- */
@media(min-width:740px){
  .hud{padding-left:24px;padding-right:24px}
  .level-num{font-size:56px}
}
@media(prefers-reduced-motion:reduce){
  *{animation-duration:.001ms!important;animation-iteration-count:1!important;transition-duration:.001ms!important}
}