:root {
  --bg: #0e0f13;
  --panel: #181a21;
  --panel-2: #21242e;
  --text: #eef0f5;
  --muted: #8b90a0;
  --green: #3fbf6f;
  --yellow: #d9b53a;
  --gray: #3a3f4b;
  --r: #ff5a5a;
  --g: #45d67e;
  --b: #5a8bff;
  --radius: 14px;
  --shadow: 0 8px 30px rgba(0, 0, 0, 0.45);
}

* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }
html, body { margin: 0; height: 100%; }
body {
  background: radial-gradient(1200px 600px at 50% -10%, #1a1d27 0%, var(--bg) 60%);
  color: var(--text);
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  display: flex;
  justify-content: center;
  min-height: 100%;
  user-select: none;
}

#app {
  width: 100%;
  max-width: 460px;
  padding: 12px 16px 24px;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 4px 0 0;
}
h1 {
  font-size: 30px;
  letter-spacing: 6px;
  margin: 0;
  font-weight: 800;
  background: linear-gradient(90deg, var(--r), var(--g), var(--b));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.tagline { text-align: center; color: var(--muted); margin: 2px 0 14px; font-size: 14px; }
#day-label { color: var(--text); font-weight: 600; }

.icon-btn {
  background: var(--panel);
  color: var(--text);
  border: 1px solid #2b2f3a;
  width: 38px; height: 38px;
  border-radius: 50%;
  font-size: 17px;
  cursor: pointer;
  transition: transform .12s, background .12s;
}
.icon-btn:active { transform: scale(0.9); }

main { flex: 1; display: flex; flex-direction: column; }

/* target swatch */
.target-wrap { display: flex; flex-direction: column; align-items: center; margin-bottom: 14px; }
.swatch {
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}
.swatch.target {
  width: 130px; height: 80px;
  display: flex; align-items: center; justify-content: center;
  background:
    repeating-conic-gradient(#23262f 0% 25%, #1b1e25 0% 50%) 50% / 22px 22px;
  border: 1px solid #2b2f3a;
  transition: background .6s ease;
}
#target-mark { font-size: 40px; font-weight: 800; color: var(--muted); }
.target-caption { color: var(--muted); font-size: 12px; margin-top: 6px; }

/* board */
.board { display: flex; flex-direction: column; gap: 8px; margin: 4px 0 14px; }
.row { display: grid; grid-template-columns: repeat(3, 1fr) 44px; gap: 8px; }
.cell {
  aspect-ratio: 1 / 1;
  max-height: 64px;
  border-radius: 12px;
  background: var(--panel);
  border: 1px solid #2b2f3a;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  position: relative;
  font-size: 24px;
  font-weight: 700;
}
.cell .dir { font-size: 13px; line-height: 1; opacity: .9; height: 13px; }
.cell.green { background: var(--green); border-color: var(--green); color: #06250f; }
.cell.yellow { background: var(--yellow); border-color: var(--yellow); color: #2a2000; }
.cell.gray { background: var(--gray); border-color: var(--gray); color: #c9cdd8; }
.cell.flip { animation: flip .5s ease both; }
@keyframes flip {
  0% { transform: rotateX(0); }
  50% { transform: rotateX(90deg); }
  100% { transform: rotateX(0); }
}
.row-swatch {
  align-self: center;
  width: 44px; height: 44px;
  border-radius: 10px;
  border: 1px solid #2b2f3a;
}

/* input */
.input-area { margin-top: auto; }
.steppers {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
  margin-bottom: 12px;
}
.stepper, .preview-wrap {
  background: var(--panel);
  border: 1px solid #2b2f3a;
  border-radius: var(--radius);
  padding: 8px 6px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}
.ch-label { font-size: 12px; font-weight: 800; letter-spacing: 1px; color: var(--muted); }
.ch-label.r { color: var(--r); }
.ch-label.g { color: var(--g); }
.ch-label.b { color: var(--b); }
.ch-val { font-size: 30px; font-weight: 800; line-height: 1.1; min-width: 1ch; text-align: center; }
.step {
  background: var(--panel-2);
  border: none;
  color: var(--text);
  width: 100%;
  border-radius: 8px;
  padding: 6px 0;
  font-size: 14px;
  cursor: pointer;
  transition: transform .1s, background .1s;
}
.step:active { transform: scale(0.92); background: #2c303c; }
.preview { width: 100%; flex: 1; min-height: 56px; background: rgb(140,140,140); }

.guess-btn, .share-btn {
  width: 100%;
  padding: 16px;
  border: none;
  border-radius: var(--radius);
  font-size: 18px;
  font-weight: 800;
  letter-spacing: 2px;
  cursor: pointer;
  color: #06250f;
  background: linear-gradient(90deg, var(--g), #6fe3a0);
  box-shadow: var(--shadow);
  transition: transform .1s, filter .1s;
}
.guess-btn:active, .share-btn:active { transform: translateY(1px); filter: brightness(1.05); }
.guess-btn:disabled { opacity: .5; cursor: default; }

/* endgame */
.endgame { text-align: center; margin-top: 12px; }
.reveal { font-size: 15px; margin-bottom: 12px; line-height: 1.5; }
.reveal b { color: var(--text); }
.share-btn { background: linear-gradient(90deg, var(--b), #8db3ff); color: #04122e; }
.practice-btn {
  width: 100%; padding: 13px; margin-top: 10px;
  border: 1px solid #2b2f3a; border-radius: var(--radius);
  background: var(--panel); color: var(--text);
  font-size: 15px; font-weight: 700; letter-spacing: 1px; cursor: pointer;
  transition: transform .1s, background .1s;
}
.practice-btn:active { transform: translateY(1px); background: var(--panel-2); }
.cross-cta { display: block; margin-top: 10px; padding: 12px; border: 1px solid #2b2f3a; border-radius: var(--radius); background: var(--panel); color: var(--text); text-decoration: none; font-size: 14px; font-weight: 600; transition: transform .1s, background .1s; }
.cross-cta:active { transform: translateY(1px); background: var(--panel-2); }
.cross-cta b { color: var(--b); }
.tip-nudge {
  margin-top: 14px; font-size: 13px; line-height: 1.5; color: var(--muted);
  background: rgba(217,181,58,.08); border: 1px solid rgba(217,181,58,.25);
  border-radius: 12px; padding: 10px 14px;
}
.tip-nudge a { color: var(--yellow); font-weight: 700; text-decoration: none; white-space: nowrap; }
.tip-nudge a:hover { text-decoration: underline; }
.inline-swatch { display: inline-block; width: 16px; height: 16px; border-radius: 4px; vertical-align: middle; border: 1px solid rgba(255,255,255,.15); }
.countdown { color: var(--muted); font-size: 13px; margin-top: 12px; }
.countdown span { color: var(--text); font-variant-numeric: tabular-nums; }

footer { text-align: center; margin-top: 20px; }
.tip {
  display: inline-block;
  color: var(--text);
  text-decoration: none;
  background: var(--panel);
  border: 1px solid #2b2f3a;
  padding: 9px 16px;
  border-radius: 999px;
  font-size: 14px;
  transition: transform .1s, background .1s;
}
.tip:active { transform: scale(0.96); }
.cross { margin-top: 12px; font-size: 13px; color: var(--muted); }
.cross a { color: var(--g); text-decoration: none; }
.cross a:hover { text-decoration: underline; }
.credit { color: var(--muted); font-size: 11px; margin-top: 8px; }

/* SEO / supporting content — quiet, below the game */
.about { margin-top: 40px; padding-top: 24px; border-top: 1px solid #20232c; color: var(--muted); }
.about h2 { color: #c7cbd6; font-size: 16px; margin: 22px 0 8px; }
.about p, .about li { font-size: 13px; line-height: 1.6; color: #9aa0b0; }
.about b { color: #c7cbd6; }
.about ol { padding-left: 18px; margin: 6px 0; }
.about li { margin: 5px 0; }
.about a { color: var(--g); text-decoration: none; }
.about a:hover { text-decoration: underline; }
.more-games { margin-top: 18px; }

/* modals */
.modal {
  position: fixed; inset: 0;
  background: rgba(0,0,0,.6);
  display: flex; align-items: center; justify-content: center;
  padding: 18px; z-index: 50;
}
.modal-card {
  background: var(--panel);
  border: 1px solid #2b2f3a;
  border-radius: 18px;
  padding: 22px;
  max-width: 380px; width: 100%;
  position: relative;
  box-shadow: var(--shadow);
  max-height: 86vh; overflow-y: auto;
}
.modal-card h2 { margin: 0 0 12px; }
.modal-card p { color: #d3d6df; line-height: 1.5; font-size: 14px; }
.close {
  position: absolute; top: 12px; right: 14px;
  background: none; border: none; color: var(--muted);
  font-size: 26px; cursor: pointer; line-height: 1;
}
.legend { list-style: none; padding: 0; }
.legend li { display: flex; align-items: center; gap: 10px; margin: 8px 0; font-size: 14px; color: #d3d6df; }
.chip { width: 22px; height: 22px; border-radius: 6px; display: inline-block; flex: none; }
.chip.sm { width: 16px; height: 16px; }
.chip.green { background: var(--green); }
.chip.yellow { background: var(--yellow); }
.chip.gray { background: var(--gray); }

.stats-row { display: flex; justify-content: space-around; margin-bottom: 18px; }
.stat { text-align: center; }
.stat .num { font-size: 28px; font-weight: 800; }
.stat .lbl { font-size: 11px; color: var(--muted); }
.dist { display: flex; flex-direction: column; gap: 6px; margin-bottom: 16px; }
.dist .bar-row { display: flex; align-items: center; gap: 8px; font-size: 13px; }
.dist .bar-row .n { width: 12px; color: var(--muted); }
.dist .bar {
  background: var(--b); color: #04122e; font-weight: 700;
  padding: 2px 8px; border-radius: 5px; text-align: right; min-width: 24px;
  transition: width .4s ease;
}
.dist .bar.cur { background: var(--green); }

/* toast */
.toast {
  position: fixed; bottom: 28px; left: 50%; transform: translateX(-50%);
  background: var(--text); color: #0c0d11;
  padding: 10px 18px; border-radius: 999px; font-weight: 700; font-size: 14px;
  z-index: 80; box-shadow: var(--shadow);
}
.hidden { display: none !important; }

@media (max-height: 720px) {
  .swatch.target { height: 64px; }
  .cell { max-height: 54px; }
}