/* styles.css — Falling Sand Game.
 *
 * The canvas draws empty cells as fully transparent, so `--sky` below is
 * literally the colour of empty space inside the simulation. That is why the
 * box reads as a lit room in light mode and a night sky in dark mode without
 * the renderer knowing a theme exists.
 */

:root {
  --bg: #0e1014;
  --panel: #161a21;
  --panel2: #1c212a;
  --line: #2a313d;
  --ink: #e7ecf3;
  --ink2: #9aa6b6;
  --accent: #e0a24a;
  --accent-ink: #17130c;
  --sky: #090b0f;
  --danger: #e2686a;
  --ok: #6fc48a;
  --radius: 10px;
  --shadow: 0 1px 2px rgba(0,0,0,.4), 0 8px 24px rgba(0,0,0,.28);
}

:root[data-theme="light"] {
  --bg: #f4f2ee;
  --panel: #ffffff;
  --panel2: #faf8f5;
  --line: #e0dcd4;
  --ink: #21252b;
  --ink2: #6b7280;
  --accent: #b4762a;
  --accent-ink: #ffffff;
  --sky: #e9e5dd;
  --danger: #b33a3c;
  --ok: #2f7d4f;
  --shadow: 0 1px 2px rgba(0,0,0,.06), 0 8px 24px rgba(0,0,0,.06);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--ink);
  font: 15px/1.55 ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

a { color: var(--accent); }
a:hover { text-decoration: none; }

.hidden { display: none !important; }
.muted { color: var(--ink2); }
.small { font-size: 13px; }

/* ---- header ------------------------------------------------------------ */

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  padding: 10px 18px;
  background: var(--panel);
  border-bottom: 1px solid var(--line);
}

.brand { display: flex; align-items: center; gap: 9px; flex-wrap: wrap; }
.brand strong { letter-spacing: .2px; }
.backlink { text-decoration: none; color: var(--ink2); font-size: 13px; }
.backlink:hover { color: var(--ink); }
.sep { color: var(--line); }

/* The badge that replaces a metered app's credit readout. It is a statement of
 * fact about this app, not decoration: there is no model and nothing to bill. */
.freechip {
  font-size: 11.5px;
  padding: 2.5px 9px;
  border-radius: 999px;
  background: color-mix(in srgb, var(--ok) 16%, transparent);
  color: var(--ok);
  border: 1px solid color-mix(in srgb, var(--ok) 34%, transparent);
  white-space: nowrap;
}

.topactions { display: flex; align-items: center; gap: 8px; }
.who { font-size: 12.5px; color: var(--ink2); white-space: nowrap; }

button {
  font: inherit;
  cursor: pointer;
  border-radius: 8px;
  border: 1px solid var(--line);
  padding: 7px 13px;
  background: var(--panel2);
  color: var(--ink);
  transition: background .12s ease, border-color .12s ease;
}
button:hover { border-color: var(--ink2); }
button:disabled { opacity: .5; cursor: not-allowed; }
button.ghost { background: transparent; }
button.primary {
  background: var(--accent);
  color: var(--accent-ink);
  border-color: transparent;
  font-weight: 600;
}
button.primary:hover { filter: brightness(1.07); }
button:focus-visible, input:focus-visible, select:focus-visible, [tabindex]:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* ---- layout ------------------------------------------------------------ */

main { max-width: 1180px; margin: 0 auto; padding: 22px 18px 40px; }

.hero { margin-bottom: 18px; }
.hero h1 { font-size: 27px; margin: 0 0 8px; letter-spacing: -.2px; }
.lede { margin: 0; color: var(--ink2); max-width: 78ch; }

.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 16px 18px;
  margin-bottom: 16px;
}
.panel h2 { font-size: 16px; margin: 0 0 6px; }
.panels { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; align-items: start; }
.panels > .panel { margin-bottom: 0; }

.prose p { max-width: 76ch; color: var(--ink2); }
.prose em { color: var(--ink); font-style: normal; font-weight: 600; }

/* ---- the box ----------------------------------------------------------- */

.stage {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 14px;
  margin-bottom: 16px;
  box-shadow: var(--shadow);
}

.boxwrap { position: relative; line-height: 0; }

/* One canvas pixel per cell, scaled up by the layout. `pixelated` is the whole
 * look — with smoothing on, a 400-wide grid blown up to 1100px turns into a
 * blur and every grain of sand disappears. */
#box {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  background: var(--sky);
  border-radius: 6px;
  border: 1px solid var(--line);
  image-rendering: pixelated;
  image-rendering: crisp-edges;
  touch-action: none;      /* or dragging to paint scrolls the page on a tablet */
  cursor: crosshair;
}

/* A ring showing the true brush footprint. Sized in page pixels by app.js from
 * the brush radius in cells, so it stays honest across grid sizes and window
 * widths. */
.cursor {
  position: absolute;
  border: 1.5px solid rgba(255,255,255,.75);
  box-shadow: 0 0 0 1.5px rgba(0,0,0,.45);
  border-radius: 50%;
  pointer-events: none;
  transform: translate(-50%, -50%);
  opacity: 0;
  transition: opacity .12s ease;
}
.boxwrap:hover .cursor { opacity: 1; }

.boxnote {
  position: absolute;
  left: 12px;
  bottom: 12px;
  background: color-mix(in srgb, var(--panel) 88%, transparent);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 7px 11px;
  font-size: 13px;
  line-height: 1.4;
  max-width: 60%;
  backdrop-filter: blur(3px);
}

/* ---- palette ----------------------------------------------------------- */

.palette {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  margin: 12px 0 10px;
}

.swatch {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 6px 11px 6px 7px;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: var(--panel2);
  font-size: 13.5px;
}
.swatch:hover { border-color: var(--ink2); }
.swatch[aria-pressed="true"] {
  border-color: var(--accent);
  background: color-mix(in srgb, var(--accent) 15%, transparent);
  font-weight: 600;
}
.chip {
  width: 15px;
  height: 15px;
  border-radius: 4px;
  border: 1px solid rgba(128,128,128,.45);
  flex: none;
}
.swatch .key {
  font-size: 11px;
  color: var(--ink2);
  font-variant-numeric: tabular-nums;
}

/* ---- controls ---------------------------------------------------------- */

.controls {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  align-items: end;
}
.ctl { display: flex; align-items: center; gap: 8px; }
.ctl.grow { flex-direction: column; align-items: stretch; gap: 4px; flex: 1 1 220px; }
.ctl > span { font-size: 13px; color: var(--ink2); white-space: nowrap; }
.slider { flex-direction: column; align-items: stretch; gap: 2px; min-width: 150px; }
.slider > span { display: flex; justify-content: space-between; gap: 10px; }
.slider output { color: var(--ink); font-variant-numeric: tabular-nums; }

input[type="range"] { width: 100%; accent-color: var(--accent); }
input[type="text"], input[type="search"], select {
  font: inherit;
  padding: 7px 10px;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: var(--panel2);
  color: var(--ink);
  width: 100%;
}

.hint {
  margin: 12px 0 0;
  font-size: 13px;
  color: var(--ink2);
  min-height: 1.5em;
}

/* ---- starters ---------------------------------------------------------- */

.starters { display: grid; gap: 8px; margin-top: 10px; }

.starter {
  text-align: left;
  display: block;
  padding: 10px 13px;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: var(--panel2);
  width: 100%;
}
.starter:hover { border-color: var(--accent); }
.starter b { display: block; font-size: 14px; margin-bottom: 2px; }
.starter span { display: block; font-size: 12.5px; color: var(--ink2); line-height: 1.45; }
.starter .shows {
  margin-top: 5px;
  font-size: 11px;
  color: var(--accent);
  text-transform: lowercase;
  letter-spacing: .3px;
}

/* ---- stats ------------------------------------------------------------- */

.stats {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 3px 14px;
  margin: 10px 0 8px;
  font-size: 13px;
}
.stats dt { color: var(--ink2); }
.stats dd {
  margin: 0;
  font-variant-numeric: tabular-nums;
  text-align: right;
}
.stats dd.warn { color: var(--danger); }

/* ---- saved scenes ------------------------------------------------------ */

.saveform { display: flex; flex-wrap: wrap; gap: 10px; align-items: end; margin: 10px 0 4px; }
.searchrow { margin: 14px 0 6px; }

.scenelist { display: grid; gap: 7px; }

.scene {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 11px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel2);
}
.scene .meta { flex: 1; min-width: 0; }
.scene b { display: block; font-size: 13.5px; }
.scene .sub {
  font-size: 12px;
  color: var(--ink2);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.scene .score {
  font-size: 11px;
  color: var(--accent);
  font-variant-numeric: tabular-nums;
}
.scene button { padding: 5px 10px; font-size: 12.5px; }

.empty {
  padding: 14px;
  text-align: center;
  color: var(--ink2);
  font-size: 13px;
  border: 1px dashed var(--line);
  border-radius: 8px;
}

/* ---- footer ------------------------------------------------------------ */

.foot {
  border-top: 1px solid var(--line);
  padding: 18px;
  text-align: center;
  background: var(--panel);
}
.foot p { margin: 0 0 6px; }
.foot p:last-child { margin: 0; }

/* ---- narrow ------------------------------------------------------------ */

@media (max-width: 880px) {
  .panels { grid-template-columns: 1fr; }
  .hero h1 { font-size: 23px; }
  main { padding: 16px 12px 32px; }
  .controls { gap: 10px; }
  .slider { min-width: 120px; }
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; }
}