:root {
  --void: #0a0815;
  --bg-1: #110d22;
  --bg-2: #1a1535;
  --surface: #221a40;
  --surface-2: #2c2350;
  --text: #f0ecfb;
  --muted: #b9b0d4;
  --dim: #7d7499;
  --crys: #b794f6;       /* amethyst */
  --crys-deep: #8b5cf6;
  --ice: #a5f3fc;        /* icy cyan */
  --ice-deep: #67e8f9;
  --glow: #d8c7ff;
  --danger: #fca5a5;
  --line: rgba(240, 236, 251, 0.08);
  --line-2: rgba(240, 236, 251, 0.16);
  --display: 'Cormorant Garamond', Georgia, serif;
  --mono: 'JetBrains Mono', ui-monospace, monospace;
  --ease: cubic-bezier(0.16, 1, 0.3, 1);
  --spring: cubic-bezier(0.34, 1.56, 0.64, 1);
}

* { box-sizing: border-box; margin: 0; padding: 0; -webkit-tap-highlight-color: transparent; }

html { scroll-behavior: smooth; }
body {
  background:
    radial-gradient(ellipse 70% 55% at 25% 5%, rgba(139, 92, 246, 0.12), transparent 55%),
    radial-gradient(ellipse 60% 50% at 85% 95%, rgba(103, 232, 249, 0.08), transparent 55%),
    linear-gradient(180deg, var(--void) 0%, var(--bg-1) 55%, var(--void) 100%);
  background-attachment: fixed;
  color: var(--text);
  font-family: var(--display);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  position: relative;
  overflow-x: hidden;
}

/* drifting background shards */
#bg-shards { position: fixed; inset: 0; z-index: 0; pointer-events: none; }
#bg-shards .shard {
  position: absolute;
  width: 2px; height: 2px;
  background: var(--glow);
  border-radius: 50%;
  opacity: 0.4;
  animation: twk var(--dur, 5s) ease-in-out infinite;
  animation-delay: var(--delay, 0s);
}
@keyframes twk { 0%, 100% { opacity: 0.1; transform: scale(0.7); } 50% { opacity: 0.8; transform: scale(1.2); } }

.grain {
  position: fixed; inset: 0; z-index: 1; pointer-events: none;
  opacity: 0.035; mix-blend-mode: overlay;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='3'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

#root { position: relative; z-index: 2; min-height: 100vh; display: flex; flex-direction: column; }

/* ============ TOPBAR ============ */
.topbar {
  display: flex; justify-content: space-between; align-items: center;
  padding: 18px 24px; border-bottom: 1px solid var(--line);
  position: sticky; top: 0; z-index: 10;
  background: rgba(10, 8, 21, 0.82); backdrop-filter: blur(12px);
}
.brand { font-family: var(--display); font-style: italic; font-size: 22px; letter-spacing: 0.04em; color: var(--muted); }
.brand b { color: var(--crys); font-weight: 600; font-style: normal; }
.top-meta { display: flex; gap: 10px; align-items: center; font-family: var(--mono); font-size: 12px; color: var(--dim); letter-spacing: 0.1em; text-transform: uppercase; }
.top-meta .dot { width: 4px; height: 4px; background: var(--crys); border-radius: 50%; }

/* ============ STAGE ============ */
.stage { flex: 1; display: flex; flex-direction: column; align-items: center; padding: 32px 20px 60px; max-width: 720px; width: 100%; margin: 0 auto; }

/* ============ HERO / INTRO ============ */
.hero { text-align: center; padding: 36px 0 28px; }
.hero .eyebrow { font-family: var(--mono); font-size: 11px; letter-spacing: 0.3em; color: var(--crys); text-transform: uppercase; margin-bottom: 18px; }
.hero h1 { font-family: var(--display); font-weight: 500; font-size: clamp(48px, 9vw, 82px); line-height: 0.95; letter-spacing: -0.02em; margin-bottom: 8px; }
.hero h1 .italic { font-style: italic; color: var(--ice); }
.hero .sub { font-style: italic; color: var(--muted); font-size: 17px; max-width: 440px; margin: 8px auto 0; line-height: 1.5; }

.divider { display: flex; align-items: center; gap: 12px; margin: 26px 0; width: 100%; max-width: 460px; }
.divider::before, .divider::after { content: ''; flex: 1; height: 1px; background: linear-gradient(90deg, transparent, var(--crys-deep), transparent); }
.divider .mark { font-size: 16px; color: var(--crys); }

.intro-card {
  background: linear-gradient(180deg, var(--surface), var(--bg-2));
  border: 1px solid var(--line-2); border-radius: 6px;
  padding: 28px; width: 100%; max-width: 480px; position: relative;
}
.intro-card h2 { font-family: var(--display); font-weight: 500; font-size: 28px; margin-bottom: 12px; }
.intro-card p { color: var(--muted); line-height: 1.6; font-size: 15px; margin-bottom: 14px; }
.intro-rules { list-style: none; margin: 16px 0 24px; padding: 16px 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.intro-rules li { display: flex; gap: 12px; padding: 6px 0; font-size: 14px; color: var(--muted); }
.intro-rules li .num { font-family: var(--mono); color: var(--crys); font-size: 11px; flex-shrink: 0; width: 18px; }

/* ============ BUTTONS ============ */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 10px;
  padding: 14px 28px; font-family: var(--mono); font-size: 12px; font-weight: 500;
  letter-spacing: 0.2em; text-transform: uppercase; border: none; border-radius: 2px;
  cursor: pointer; transition: all 0.3s var(--ease); width: 100%;
  background: linear-gradient(135deg, var(--crys), var(--crys-deep)); color: #140a26;
}
.btn:hover:not(:disabled) { transform: translateY(-1px); box-shadow: 0 12px 32px rgba(139, 92, 246, 0.3); }
.btn:disabled { opacity: 0.4; cursor: not-allowed; }
.btn.ghost { background: transparent; color: var(--muted); border: 1px solid var(--line-2); }
.btn.ghost:hover:not(:disabled) { background: var(--surface); border-color: var(--crys); color: var(--text); box-shadow: none; }
.btn.ice { background: linear-gradient(135deg, var(--ice), var(--ice-deep)); color: #06222a; }

/* ============ BOARD ============ */
.board-frame { width: 100%; max-width: 480px; margin: 0 auto; }
.board-header { display: flex; justify-content: space-between; align-items: center; padding: 0 4px 16px; font-family: var(--mono); font-size: 11px; letter-spacing: 0.2em; color: var(--dim); text-transform: uppercase; }
.board-header .mode-tag { display: inline-flex; align-items: center; gap: 8px; color: var(--ice); }
.board-header .mode-tag::before { content: ''; width: 6px; height: 6px; background: var(--ice); border-radius: 50%; box-shadow: 0 0 8px var(--ice); }
.board-header .timer { color: var(--text); font-size: 14px; letter-spacing: 0.1em; }

.board-stage { position: relative; }

.board {
  position: relative; width: 100%; aspect-ratio: 1;
  display: grid; gap: 4px; padding: 10px;
  background:
    radial-gradient(ellipse at 50% 50%, rgba(139, 92, 246, 0.06), transparent 70%),
    linear-gradient(160deg, #0d0a1f, #140f2a);
  border: 1px solid var(--line-2); border-radius: 6px;
  touch-action: manipulation;
}
/* symmetry axes overlay */
.axes { position: absolute; inset: 10px; pointer-events: none; z-index: 1; opacity: 0.5; }
.axes line { stroke: rgba(167, 243, 252, 0.16); stroke-width: 1; stroke-dasharray: 4 5; }

.cell {
  position: relative; aspect-ratio: 1; border-radius: 5px; cursor: pointer;
  background: rgba(240, 236, 251, 0.025);
  border: 1px solid rgba(240, 236, 251, 0.05);
  transition: background 0.35s var(--ease), box-shadow 0.35s var(--ease), transform 0.3s var(--spring), border-color 0.35s var(--ease);
}
.cell:hover { background: rgba(240, 236, 251, 0.06); border-color: var(--line-2); }
.cell.lit {
  background: radial-gradient(circle at 35% 30%, #fff, var(--glow) 30%, var(--crys) 65%, var(--crys-deep) 100%);
  border-color: rgba(255, 255, 255, 0.5);
  box-shadow: 0 0 14px rgba(183, 148, 246, 0.55), inset 0 0 8px rgba(255, 255, 255, 0.45);
}
.cell.preview {
  background: radial-gradient(circle at 35% 30%, rgba(167,243,252,0.6), rgba(103,232,249,0.25) 60%, transparent 80%);
  border-color: rgba(167, 243, 252, 0.4);
}
.board.win .cell.lit {
  background: radial-gradient(circle at 35% 30%, #fff, #e0f7ff 25%, var(--ice) 55%, var(--ice-deep) 100%);
  box-shadow: 0 0 22px rgba(165, 243, 252, 0.8), inset 0 0 10px rgba(255, 255, 255, 0.6);
  animation: bloom 0.7s var(--spring) backwards;
  animation-delay: var(--bd, 0s);
}
@keyframes bloom {
  0% { transform: scale(0.6); }
  55% { transform: scale(1.22); }
  100% { transform: scale(1); }
}

/* ============ REFERENCE ============ */
.reference { position: relative; margin: 18px auto 0; width: 190px; max-width: 70%; }
.reference-label { text-align: center; font-family: var(--mono); font-size: 10px; letter-spacing: 0.25em; color: var(--dim); text-transform: uppercase; margin-bottom: 8px; }
.medallion {
  aspect-ratio: 1; border-radius: 10px; padding: 12px;
  background: radial-gradient(circle, var(--bg-2), var(--void));
  border: 1px solid var(--crys-deep);
  display: grid; gap: 2px; position: relative; overflow: hidden;
  transition: filter 0.8s var(--ease);
}
.medallion .rcell { border-radius: 2px; background: rgba(240,236,251,0.04); }
.medallion .rcell.on { background: radial-gradient(circle at 35% 30%, #fff, var(--crys) 70%); box-shadow: 0 0 4px var(--crys); }
.reference.hidden .medallion { filter: blur(9px) brightness(0.35); }
.reference.hidden .medallion::after {
  content: 'from memory'; position: absolute; inset: 0; display: flex; align-items: center; justify-content: center;
  font-family: var(--mono); font-size: 10px; letter-spacing: 0.2em; color: var(--ice); text-transform: uppercase; filter: none;
}
.peek-btn {
  display: block; margin: 10px auto 0; font-family: var(--mono); font-size: 10px; letter-spacing: 0.16em;
  text-transform: uppercase; color: var(--dim); background: none; border: 1px solid var(--line); border-radius: 999px;
  padding: 6px 14px; cursor: pointer; transition: all 0.25s;
}
.peek-btn:hover { color: var(--ice); border-color: var(--ice); }

/* ============ CONTROLS ============ */
.controls { display: flex; gap: 12px; margin-top: 20px; }
.controls .count-box {
  flex: 1; display: flex; align-items: center; justify-content: center;
  font-family: var(--mono); font-size: 12px; letter-spacing: 0.15em; color: var(--muted); text-transform: uppercase;
  background: var(--surface); border: 1px solid var(--line-2); border-radius: 2px; padding: 12px 16px;
}
.controls .count-box b { color: var(--ice); margin: 0 4px; }
.controls .btn { width: auto; min-width: 130px; }

/* ============ RESULT ============ */
.result-card {
  text-align: center; padding: 32px 24px; margin: 24px 0; position: relative;
  background: linear-gradient(180deg, var(--surface), var(--bg-2));
  border: 1px solid var(--crys-deep); border-radius: 6px; width: 100%; max-width: 500px;
}
.result-card .medals-row { font-size: 38px; letter-spacing: 0.15em; margin-bottom: 8px; }
.result-card h3 { font-family: var(--display); font-style: italic; font-size: 34px; color: var(--ice); margin-bottom: 4px; }
.result-card .aka { color: var(--muted); font-style: italic; margin-bottom: 18px; }
.result-stats { display: flex; justify-content: center; gap: 28px; margin: 18px 0 24px; }
.result-stats .s-label { font-family: var(--mono); font-size: 10px; letter-spacing: 0.2em; color: var(--dim); text-transform: uppercase; margin-bottom: 4px; }
.result-stats .s-value { font-family: var(--mono); font-size: 22px; color: var(--text); }
.result-fact { background: var(--void); border-left: 2px solid var(--crys); padding: 14px 16px; margin: 18px 0; text-align: left; font-size: 14px; line-height: 1.6; color: var(--muted); font-style: italic; }
.result-fact b { color: var(--ice); font-style: normal; font-family: var(--mono); font-size: 10px; letter-spacing: 0.2em; text-transform: uppercase; display: block; margin-bottom: 6px; }
.btn-row { display: flex; gap: 10px; }
.btn-row .btn { flex: 1; }

/* ============ LEADERBOARD ============ */
.leaderboard { margin: 32px 0 0; padding: 24px 0 0; border-top: 1px solid var(--line); width: 100%; max-width: 500px; }
.leaderboard h3 { font-family: var(--display); font-style: italic; font-size: 22px; text-align: center; margin-bottom: 4px; }
.leaderboard .lb-sub { text-align: center; font-family: var(--mono); font-size: 10px; letter-spacing: 0.25em; color: var(--dim); text-transform: uppercase; margin-bottom: 18px; }
.lb-list { list-style: none; }
.lb-row { display: grid; grid-template-columns: 32px 1fr auto auto; gap: 12px; align-items: center; padding: 12px 14px; border-bottom: 1px solid var(--line); font-size: 14px; }
.lb-row.self { background: linear-gradient(90deg, rgba(183,148,246,0.08), transparent); border-left: 2px solid var(--crys); padding-left: 12px; }
.lb-rank { font-family: var(--mono); font-size: 11px; color: var(--dim); }
.lb-rank.top1 { color: var(--ice); font-size: 14px; }
.lb-rank.top2 { color: #d4d4d4; }
.lb-rank.top3 { color: #c79a6b; }
.lb-name { font-family: var(--display); color: var(--text); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-size: 16px; }
.lb-medals { font-size: 13px; letter-spacing: 0.1em; }
.lb-time { font-family: var(--mono); font-size: 12px; color: var(--muted); }
.lb-empty { text-align: center; padding: 20px; color: var(--dim); font-style: italic; }
.signin-prompt { text-align: center; padding: 18px; background: var(--surface); border: 1px dashed var(--line-2); border-radius: 6px; margin-bottom: 16px; font-size: 13px; color: var(--muted); }
.signin-prompt button { display: inline-flex; align-items: center; gap: 8px; margin-top: 10px; background: var(--text); color: var(--void); border: none; padding: 10px 16px; font-family: var(--mono); font-size: 11px; letter-spacing: 0.15em; text-transform: uppercase; cursor: pointer; border-radius: 2px; transition: transform 0.25s; }
.signin-prompt button:hover { transform: translateY(-1px); }

/* ============ TOAST ============ */
.toast { position: fixed; bottom: 30px; left: 50%; transform: translateX(-50%); background: var(--surface); border: 1px solid var(--crys); color: var(--text); padding: 12px 20px; border-radius: 2px; font-family: var(--mono); font-size: 12px; letter-spacing: 0.15em; z-index: 100; box-shadow: 0 8px 30px rgba(0,0,0,0.4); opacity: 0; transition: opacity 0.3s; }
.toast.show { opacity: 1; }

.footer-tip { text-align: center; font-style: italic; color: var(--dim); font-size: 12px; margin-top: 28px; padding: 12px; }

.hidden-el { display: none !important; }

@media (max-width: 540px) {
  .stage { padding: 20px 14px 40px; }
  .topbar { padding: 14px 16px; }
  .controls { flex-direction: column; }
  .controls .btn { width: 100%; }
  .result-stats { gap: 20px; }
}

@media (prefers-reduced-motion: reduce) {
  #bg-shards .shard { animation: none !important; }
  .board.win .cell.lit { animation: none !important; }
}