@import url("https://fonts.googleapis.com/css2?family=Noto+Sans+Symbols+2&display=swap");
:root{
  --primary:#0f766e;
  --primary-dark:#0d5c56;
  --primary-light:#14b8a6;
  --accent:#dc2626;
  --navy:#0f172a;
  --bg:#f1f5f9;
  --card:#ffffff;
  --text:#0f172a;
  --muted:#64748b;
  --border:#e2e8f0;
  --ok:#10b981;
  --err:#b91c1c;
  --ink:#0f172a;
  --gold:#0f766e;
}
*{box-sizing:border-box}
body{margin:0;font-family:Inter,system-ui,sans-serif;background:var(--bg);color:var(--text)}
a{color:var(--primary)}
header{display:flex;justify-content:space-between;align-items:center;gap:.6rem;padding:.65rem 1rem;background:#fff;border-bottom:1px solid var(--border)}
.brand{display:flex;align-items:center;gap:.45rem;text-decoration:none;color:var(--navy);font-weight:800}
.brand img{height:36px;width:auto}
.brand-name{font-size:.95rem}
.header-right{display:flex;align-items:center;gap:.4rem;flex-wrap:wrap}
.btn{display:inline-flex;align-items:center;justify-content:center;min-height:40px;padding:.4rem .8rem;border-radius:8px;border:1px solid var(--border);background:#fff;color:var(--navy);text-decoration:none;cursor:pointer;font-weight:700}
.btn:hover{border-color:var(--primary);color:var(--primary)}
.btn-gold,.btn-primary{background:var(--primary);color:#fff;border:none}
.btn-gold:hover,.btn-primary:hover{background:var(--primary-dark);color:#fff}
.card{background:var(--card);border:1px solid var(--border);border-radius:12px;padding:1rem;margin:.75rem 0}
h1{font-size:1.4rem;margin:1rem 0 .25rem}
h2{font-size:1.05rem;margin:.2rem 0 .4rem}
.sub,.muted{color:var(--muted)}
label{display:block;margin:.55rem 0 .2rem;font-size:.85rem;color:#334155}
input,select,textarea{width:100%;padding:.55rem .65rem;border-radius:8px;border:1px solid var(--border);background:#fff;color:var(--text)}
.coin-pill{display:inline-flex;align-items:center;gap:.35rem;background:#f8fafc;border:1px solid var(--border);border-radius:999px;padding:.25rem .6rem;font-weight:700;color:var(--navy)}
.coin-pill img{height:16px}
.msg{padding:.55rem .7rem;border-radius:8px;margin:.4rem 0}
.msg.ok{background:#d1fae5;color:#065f46}
.msg.err{background:#fee2e2;color:#991b1b}
table{width:100%;border-collapse:collapse}
th,td{text-align:left;padding:.45rem .3rem;border-bottom:1px solid var(--border);font-size:.9rem}
.board-wrap{overflow-x:auto;-webkit-overflow-scrolling:touch}
.board{display:grid;grid-template-columns:repeat(8,1fr);border:2px solid var(--primary-dark);border-radius:6px;overflow:hidden;width:100%;max-width:520px;min-width:0;aspect-ratio:1;height:auto}
.sq{aspect-ratio:1;display:flex;align-items:center;justify-content:center;cursor:pointer;user-select:none}
.sq.light{background:#f8fafc}
.sq.dark{background:#0f766e}
.sq.highlight{outline:3px solid var(--primary-light);outline-offset:-3px}
.sq.valid{box-shadow:inset 0 0 0 4px rgba(16,185,129,.7)}
.piece{font-size:clamp(1.5rem,8vw,3rem);line-height:1;display:flex;align-items:center;justify-content:center;width:1em;height:1em;font-variant-emoji:text;font-family:"Noto Sans Symbols 2","Segoe UI Symbol","DejaVu Sans",sans-serif;-webkit-text-size-adjust:100%}
.piece.white{color:#f5f0e1;text-shadow:0 1px 1px #000,0 0 2px #000;filter:drop-shadow(0 1px 1px #000)}
.piece.black{color:#1c1917;text-shadow:0 0 1px #fff,0 1px 1px #fff;filter:drop-shadow(0 0 1px #fff)}
.promo-pop{position:fixed;inset:0;background:rgba(15,23,42,.45);display:flex;align-items:center;justify-content:center;z-index:40}
.promo-pop[hidden]{display:none}
.promo-card{background:#fff;border-radius:12px;padding:1rem;display:flex;gap:.5rem;box-shadow:0 10px 30px rgba(0,0,0,.2)}
.promo-card button{font-size:2.2rem;width:64px;height:64px;border:1px solid #e2e8f0;border-radius:10px;background:#fff;cursor:pointer}
.promo-card button:hover{border-color:#0f766e}
.piece.checker.red{width:70%;height:70%;border-radius:50%;background:radial-gradient(circle at 35% 35%,#f87171,#991b1b);box-shadow:inset 0 0 0 3px #fecaca}
.piece.checker.black-piece{width:70%;height:70%;border-radius:50%;background:radial-gradient(circle at 35% 35%,#475569,#0f172a);box-shadow:inset 0 0 0 3px #94a3b8}
.piece.checker{display:flex;align-items:center;justify-content:center;color:#fff;font-size:1.1rem}
.clock{flex:1;min-width:140px;background:#fff;border-radius:10px;padding:.6rem .8rem;border:1px solid var(--border)}
.clock.active{border-color:var(--primary);box-shadow:0 0 0 2px rgba(15,118,110,.15)}
.pkg{border:1px solid var(--border);border-radius:10px;padding:.75rem;cursor:pointer;background:#fff}
.pkg.on{outline:2px solid var(--primary)}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:1rem}
main{max-width:1100px;margin:0 auto;padding:0 1rem 3rem}
.badge{display:inline-flex;min-width:18px;height:18px;padding:0 5px;border-radius:999px;background:var(--accent);color:#fff;font-size:.7rem;font-weight:800;align-items:center;justify-content:center;margin-left:.25rem}
@media (max-width:700px){
  header{flex-wrap:wrap}
  .header-right{width:100%;justify-content:flex-start}
  .brand-name{font-size:.85rem}
}

.top-badge{display:inline-block;margin-left:.4rem;background:#fef3c7;color:#92400e;border:1px solid #c9a227;border-radius:999px;font-size:.7rem;font-weight:800;padding:.1rem .45rem;letter-spacing:.04em}
.top-row{background:#fffbeb}

.turn-banner{
  display:block;
  width:100%;
  text-align:center;
  font-size:1.6rem;
  font-weight:800;
  letter-spacing:.06em;
  padding:.6rem 0;
  border-radius:8px;
  margin-top:.5rem;
}
.turn-banner.mine{background:var(--primary);color:#fff}
.turn-banner.theirs{background:#e2e8f0;color:var(--navy)}
.turn-banner.flash{animation:bannerFlash .4s ease}
@keyframes bannerFlash{0%{transform:scale(1.08)}100%{transform:scale(1)}}

.turn-banner.check{background:#dc2626;color:#fff}
.turn-banner.checkmate{background:#b91c1c;color:#fff;font-size:1.4rem}