/* Zen String — calm chrome around a canvas maze. Every colour arrives as a
   custom property from themes.js; the defaults below are the sand garden. */

:root {
  --bg-a: #ebdfc8;
  --bg-b: #d3c5a8;
  --blob-1: rgba(255, 250, 238, 0.95);
  --blob-2: rgba(214, 120, 90, 0.28);
  --blob-3: rgba(150, 130, 90, 0.3);
  --ink: #3b3128;
  --ink-soft: #7a6b5b;
  --paper: #f9f3e7;
  --paper-2: #efe6d5;
  --line: rgba(70, 50, 30, 0.12);
  --accent: #b8462e;
  --accent-2: #d8654a;
  --accent-ink: #fff6ee;
  --glow: #ff9a7a;
  --card: rgba(255, 252, 245, 0.42);
  --card-border: rgba(255, 255, 255, 0.55);
  --btn-bg: rgba(255, 252, 245, 0.58);
  --btn-hover: rgba(255, 252, 245, 0.85);
  --btn-border: rgba(70, 50, 30, 0.14);
  --hover: rgba(70, 50, 30, 0.08);
  --track: #cdbfa6;
  --shadow: 60, 40, 20;
  --backdrop: rgba(50, 35, 20, 0.4);
  --toast-bg: rgba(59, 49, 40, 0.92);
  --toast-ink: #fff;
  --radius: 18px;
  --ease: cubic-bezier(0.4, 0.1, 0.2, 1);
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, "Book Antiqua", Georgia, serif;
  --sans: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }

html, body {
  height: 100%;
  margin: 0;
  overflow: hidden;
  overscroll-behavior: none;
}

body {
  font-family: var(--sans);
  color: var(--ink);
  background: linear-gradient(165deg, var(--bg-a), var(--bg-b));
  -webkit-user-select: none;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
  -webkit-text-size-adjust: 100%;
  transition: background 0.8s, color 0.8s;
}

/* ---------------------------------------------------------- background */
.bg {
  position: fixed;
  inset: 0;
  overflow: hidden;
  z-index: 0;
  pointer-events: none;
}
.bg .blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(60px);
  opacity: 0.6;
  will-change: transform;
  transition: background 0.8s;
}
.bg .b1 { width: 60vmax; height: 60vmax; left: -20vmax; top: -25vmax; background: var(--blob-1); animation: drift 52s ease-in-out infinite alternate; }
.bg .b2 { width: 50vmax; height: 50vmax; right: -20vmax; bottom: -20vmax; background: var(--blob-2); animation: drift 66s ease-in-out infinite alternate-reverse; }
.bg .b3 { width: 40vmax; height: 40vmax; left: 30vw; bottom: -25vmax; background: var(--blob-3); animation: drift 78s ease-in-out infinite alternate; }
@keyframes drift {
  from { transform: translate(0, 0) scale(1); }
  to { transform: translate(8vmax, 6vmax) scale(1.12); }
}

/* -------------------------------------------------------------- layout */
.app {
  position: fixed;
  inset: 0;
  z-index: 1;
  display: flex;
  flex-direction: column;
  max-width: 920px;
  margin: 0 auto;
  padding: env(safe-area-inset-top) env(safe-area-inset-right) env(safe-area-inset-bottom) env(safe-area-inset-left);
}

.top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 16px 4px;
}
.brand { display: flex; align-items: center; gap: 10px; }
.brand img { width: 40px; height: 40px; border-radius: 11px; filter: drop-shadow(0 2px 3px rgba(var(--shadow), 0.3)); }
.brand span { display: flex; flex-direction: column; line-height: 1.1; }
.brand b { font-family: var(--serif); font-weight: 600; font-size: 22px; letter-spacing: 0.02em; }
.brand small { font-size: 11.5px; color: var(--ink-soft); letter-spacing: 0.08em; text-transform: uppercase; margin-top: 2px; }
.menu { display: flex; gap: 4px; }

.icon-btn {
  appearance: none;
  border: 0;
  background: transparent;
  color: var(--ink);
  width: 42px;
  height: 42px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  cursor: pointer;
  transition: background 0.2s, transform 0.2s;
}
.icon-btn:hover { background: var(--hover); }
.icon-btn:active { transform: scale(0.92); }
.icon-btn svg, .btn svg { width: 22px; height: 22px; fill: none; stroke: currentColor; stroke-width: 1.7; stroke-linecap: round; stroke-linejoin: round; }

.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
  padding: 4px 16px 6px;
}
.stat {
  background: var(--card);
  border: 1px solid var(--card-border);
  box-shadow: 0 1px 2px rgba(var(--shadow), 0.06);
  border-radius: 12px;
  padding: 6px 8px;
  display: flex;
  flex-direction: column;
  align-items: center;
  line-height: 1.15;
  transition: background 0.8s, border-color 0.8s;
}
.stat span { font-size: 10.5px; letter-spacing: 0.08em; text-transform: uppercase; color: var(--ink-soft); white-space: nowrap; }
.stat b { font-family: var(--serif); font-size: 20px; font-weight: 600; font-variant-numeric: tabular-nums; }

.stage {
  flex: 1;
  min-height: 0;
  position: relative;
  margin: 8px 16px;
}
.maze-canvas {
  position: absolute;
  inset: 0;
  display: block;
  touch-action: none;
  cursor: crosshair;
}

.actions {
  display: flex;
  gap: 10px;
  padding: 6px 16px 14px;
}
.btn {
  appearance: none;
  flex: 1;
  border: 1px solid var(--btn-border);
  background: var(--btn-bg);
  color: var(--ink);
  font: 500 15px var(--sans);
  padding: 11px 12px;
  border-radius: 14px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  cursor: pointer;
  box-shadow: 0 1px 2px rgba(var(--shadow), 0.08);
  transition: transform 0.15s, background 0.2s, opacity 0.2s, box-shadow 0.2s;
}
.btn svg { width: 19px; height: 19px; }
.btn:hover { background: var(--btn-hover); }
.btn:active { transform: scale(0.97); }
.btn:disabled { opacity: 0.4; cursor: default; transform: none; }
.btn.primary {
  background: linear-gradient(180deg, var(--accent-2), var(--accent));
  color: var(--accent-ink);
  border-color: transparent;
  box-shadow: 0 4px 12px -4px rgba(var(--shadow), 0.6), inset 0 1px 0 rgba(255, 255, 255, 0.25);
  text-shadow: 0 1px 1px rgba(0, 0, 0, 0.15);
}
.btn.primary:hover { filter: brightness(1.06); background: linear-gradient(180deg, var(--accent-2), var(--accent)); }
.btn.subtle { flex: 0 0 auto; background: transparent; box-shadow: none; color: var(--ink-soft); font-size: 13.5px; margin: 18px auto 0; display: flex; border-color: transparent; }

/* -------------------------------------------------------- sheets, dialogs */
.backdrop {
  position: fixed;
  inset: 0;
  z-index: 20;
  background: var(--backdrop);
  backdrop-filter: blur(3px);
  -webkit-backdrop-filter: blur(3px);
  animation: fade 0.25s;
}
@keyframes fade { from { opacity: 0; } }

.sheet {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  margin: 0 auto;
  z-index: 21;
  max-width: 560px;
  max-height: 86dvh;
  display: flex;
  flex-direction: column;
  background: var(--paper);
  color: var(--ink);
  border-radius: 24px 24px 0 0;
  box-shadow: 0 -10px 40px rgba(var(--shadow), 0.25);
  padding-bottom: env(safe-area-inset-bottom);
  animation: rise 0.32s var(--ease);
}
@keyframes rise { from { transform: translateY(40px); opacity: 0; } }
.sheet header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 12px 6px 22px;
  flex: 0 0 auto;
}
.sheet h2, .dialog h2 { font-family: var(--serif); font-weight: 600; font-size: 24px; margin: 0; letter-spacing: 0.01em; }
.sheet-body {
  overflow: auto;
  overscroll-behavior: contain;
  -webkit-overflow-scrolling: touch;
  padding: 2px 22px 26px;
  font-size: 15px;
  line-height: 1.55;
}
.sheet-body h3 { font-family: var(--serif); font-weight: 600; font-size: 17px; margin: 20px 0 8px; color: var(--ink); }
.prose p { margin: 0 0 12px; }
.prose ul { margin: 0; padding-left: 20px; }
.prose li { margin: 4px 0; }
.muted { color: var(--ink-soft); }
.about { font-size: 13px; margin-top: 22px; text-align: center; }

@media (min-width: 700px) and (min-height: 560px) {
  .sheet {
    bottom: auto;
    top: 50%;
    transform: translateY(-50%);
    border-radius: 24px;
    max-height: 80dvh;
    animation: pop 0.28s var(--ease);
  }
}
@keyframes pop { from { opacity: 0; transform: translateY(-50%) scale(0.96); } }

.dialog {
  position: fixed;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  z-index: 22;
  width: min(92vw, 400px);
  background: var(--paper);
  color: var(--ink);
  border-radius: 24px;
  padding: 26px 24px 22px;
  box-shadow: 0 20px 60px rgba(var(--shadow), 0.35);
  text-align: center;
  animation: popc 0.3s var(--ease);
  overflow: hidden;
}
@keyframes popc { from { opacity: 0; transform: translate(-50%, -50%) scale(0.94); } }
.dialog p { margin: 8px 0 18px; color: var(--ink-soft); font-size: 15.5px; line-height: 1.5; }
.dialog .row { display: flex; gap: 10px; }
.result .glow {
  position: absolute;
  inset: -40% -20% auto;
  height: 70%;
  background: radial-gradient(ellipse at 50% 40%, color-mix(in oklab, var(--glow) 45%, transparent), transparent 65%);
  pointer-events: none;
  opacity: 0.8;
}
.result h2 { position: relative; font-size: 28px; }
.result[data-perfect="1"] h2 { animation: shimmer 2.4s ease-in-out infinite; }
@keyframes shimmer { 50% { text-shadow: 0 0 18px color-mix(in oklab, var(--glow) 80%, white); } }
.result-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 6px;
  margin-bottom: 12px;
}
.result-stats div, .summary div { display: flex; flex-direction: column; align-items: center; background: var(--paper-2); border-radius: 12px; padding: 8px 4px; line-height: 1.2; }
.result-stats span, .summary span { font-size: 10px; letter-spacing: 0.08em; text-transform: uppercase; color: var(--ink-soft); }
.result-stats b, .summary b { font-family: var(--serif); font-size: 19px; font-weight: 600; }
.total { display: flex; flex-direction: column; align-items: center; margin: 4px 0 18px; }
.total span { font-size: 11px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--ink-soft); }
.total b { font-family: var(--serif); font-size: 44px; font-weight: 600; line-height: 1.05; }

/* ------------------------------------------------------------- results */
.summary { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; margin-top: 8px; }
.sheet-body table { width: 100%; border-collapse: collapse; font-size: 13.5px; font-variant-numeric: tabular-nums; }
.sheet-body th { text-align: left; vertical-align: bottom; font-weight: 500; color: var(--ink-soft); font-size: 11px; letter-spacing: 0.06em; text-transform: uppercase; padding: 4px 4px; border-bottom: 1px solid var(--line); }
.sheet-body td { padding: 7px 4px; border-bottom: 1px solid var(--line); white-space: nowrap; vertical-align: middle; }
.rs-games, .rs-time, .rs-eff, .rs-hints, .rs-score { text-align: right; }
td.rs-score { font-family: var(--serif); font-weight: 600; font-size: 15px; }
tr[data-perfect="1"] td.rs-eff { color: var(--accent); font-weight: 600; }
@media (max-width: 420px) { .rs-hints { display: none; } .sheet-body td { padding: 7px 3px; } }

/* ------------------------------------------------------------- settings */
.opts { display: flex; flex-wrap: wrap; gap: 8px; }
.opt {
  appearance: none;
  border: 1.5px solid var(--line);
  background: var(--paper-2);
  color: var(--ink);
  font: 500 14px var(--sans);
  padding: 8px 14px 8px 10px;
  border-radius: 999px;
  display: inline-flex;
  align-items: center;
  gap: 9px;
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s, transform 0.15s;
}
.opt:active { transform: scale(0.97); }
.opt[aria-checked="true"] { border-color: var(--accent); background: var(--paper); box-shadow: 0 0 0 3px color-mix(in oklab, var(--accent) 22%, transparent); }
.opts.lang .opt, .opts.sizes .opt, .opts.textures .opt { padding-left: 14px; min-width: 92px; justify-content: center; }
.swatch {
  display: inline-block;
  width: 26px;
  height: 26px;
  border-radius: 8px;
  flex: 0 0 auto;
  background:
    linear-gradient(var(--sw-string), var(--sw-string)) 12px 5px / 3px 16px no-repeat,
    linear-gradient(var(--sw-wall), var(--sw-wall)) 5px 5px / 3px 11px no-repeat,
    linear-gradient(var(--sw-wall), var(--sw-wall)) 5px 5px / 14px 3px no-repeat,
    linear-gradient(var(--sw-wall), var(--sw-wall)) 18px 11px / 3px 11px no-repeat,
    var(--sw-floor);
  box-shadow: inset 0 0 0 1px rgba(0, 0, 0, 0.18);
}
.toggle { display: flex; align-items: center; gap: 12px; margin-top: 22px; cursor: pointer; font-size: 15px; line-height: 1.35; }
.toggle input { position: absolute; opacity: 0; width: 0; height: 0; }
.toggle .track { flex: 0 0 auto; width: 46px; height: 28px; border-radius: 999px; background: var(--track); position: relative; transition: background 0.25s; }
.toggle .track::after { content: ""; position: absolute; top: 3px; left: 3px; width: 22px; height: 22px; border-radius: 50%; background: #fff; box-shadow: 0 1px 3px rgba(0, 0, 0, 0.3); transition: transform 0.25s var(--ease); }
.toggle input:checked + .track { background: var(--accent); }
.toggle input:checked + .track::after { transform: translateX(18px); }
.toggle input:focus-visible + .track { outline: 2px solid var(--accent-2); outline-offset: 2px; }

/* ---------------------------------------------------------------- toast */
.toast {
  position: fixed;
  left: 50%;
  bottom: calc(84px + env(safe-area-inset-bottom));
  transform: translateX(-50%) translateY(10px);
  z-index: 15;
  background: var(--toast-bg);
  color: var(--toast-ink);
  padding: 10px 16px;
  border-radius: 999px;
  font-size: 14px;
  max-width: min(88vw, 420px);
  text-align: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s, transform 0.25s;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.25);
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* ------------------------------------------------------- small screens */
@media (max-height: 640px) {
  .top { padding-top: 6px; }
  .brand small { display: none; }
  .brand b { font-size: 19px; }
  .brand img { width: 32px; height: 32px; }
  .stat b { font-size: 17px; }
  .stat { padding: 4px 6px; }
  .stage { margin: 6px 16px; }
  .actions { padding-bottom: 10px; }
  .btn { padding: 9px 10px; }
}
@media (max-width: 520px) {
  .btn { flex-direction: column; gap: 3px; padding: 8px 6px 7px; font-size: 12.5px; }
  .btn span { white-space: nowrap; }
  .btn svg { width: 21px; height: 21px; }
  .dialog .btn { flex-direction: row; }
}
@media (min-width: 900px) and (min-height: 700px) {
  .brand b { font-size: 26px; }
  .stage { margin: 14px 16px; }
}

@media (prefers-reduced-motion: reduce) {
  .bg .blob { animation: none; }
  .sheet, .dialog, .backdrop { animation: none; transition-duration: 0.01s; }
  .result h2 { animation: none; }
}