/* Sticker Maker — mobile-first dark UI */

:root {
  --bg: #0b0d12;
  --bg-2: #141823;
  --bg-3: #1c2230;
  --fg: #e8ecf3;
  --muted: #8a91a3;
  --accent: #ff6ec7;
  --accent-2: #4fc3ff;
  --line: #232a3a;
  --radius: 14px;
  --safe-top: env(safe-area-inset-top, 0);
  --safe-bottom: env(safe-area-inset-bottom, 0);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--fg);
  font: 15px/1.4 -apple-system, BlinkMacSystemFont, "SF Pro Text",
        system-ui, "Segoe UI", Roboto, sans-serif;
  min-height: 100dvh;
  /* Disable iOS double-tap zoom on buttons & sliders */
  touch-action: manipulation;
  /* Allow controls section to scroll without pulling the whole page */
  overscroll-behavior-y: contain;
  -webkit-text-size-adjust: 100%;
  -webkit-tap-highlight-color: transparent;
}

#app {
  display: flex;
  flex-direction: column;
  min-height: 100dvh;
  padding-top: var(--safe-top);
  padding-bottom: var(--safe-bottom);
}

/* Top bar */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  font-weight: 600;
}
.brand { letter-spacing: .02em; }
.help {
  color: var(--accent-2);
  text-decoration: none;
  padding: 8px 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 13px;
  font-weight: 500;
}
.help:active { background: var(--bg-3); }

/* Sticker stage */
.stage {
  flex: 0 0 auto;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 8px 16px 12px;
}
.canvas-wrap {
  width: 100%;
  max-width: 420px;
  aspect-ratio: 1 / 1;
  border-radius: var(--radius);
  /* Show transparency as a checkered pattern */
  background-color: #1a1f2c;
  background-image:
    linear-gradient(45deg, #232b3d 25%, transparent 25%),
    linear-gradient(-45deg, #232b3d 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, #232b3d 75%),
    linear-gradient(-45deg, transparent 75%, #232b3d 75%);
  background-size: 24px 24px;
  background-position: 0 0, 0 12px, 12px -12px, -12px 0;
  border: 1px solid var(--line);
  overflow: hidden;
}
.canvas-wrap {
  position: relative;
  /* touch-action:none on the wrapper too — iOS Safari otherwise lets a touch
     that lands a hair outside the canvas bounds initiate a page scroll. */
  touch-action: none;
  overscroll-behavior: contain;
}
#photo-canvas {
  display: block;
  width: 100%;
  height: 100%;
  touch-action: none; /* prevent iOS scroll on drag */
}

/* Brush cursor preview — a ring layered over the canvas so you can see
   exactly where the brush will hit before tapping. Pointer-events disabled
   so it never blocks canvas interaction. */
#brush-cursor {
  position: absolute;
  border: 2px solid rgba(255, 255, 255, 0.9);
  box-shadow: 0 0 0 1px rgba(0, 0, 0, 0.6), inset 0 0 0 1px rgba(0, 0, 0, 0.5);
  border-radius: 50%;
  transform: translate(-50%, -50%);
  pointer-events: none;
  opacity: 0;
  transition: opacity .08s;
  z-index: 10;
}
#brush-cursor.show { opacity: 1; }
#brush-cursor.crosshair {
  border-radius: 0;
  background:
    linear-gradient(rgba(255,255,255,.9), rgba(255,255,255,.9)) center/100% 2px no-repeat,
    linear-gradient(rgba(255,255,255,.9), rgba(255,255,255,.9)) center/2px 100% no-repeat;
  border: 0;
  box-shadow: none;
}

/* File-picker label styled like a button */
.btn-file {
  display: block;
  text-align: center;
  cursor: pointer;
  -webkit-user-select: none;
  user-select: none;
}
.btn-file:active { transform: scale(.98); }

.hint {
  margin: 0;
  font-size: 12px;
  color: var(--muted);
  line-height: 1.4;
}
.snaps .snap[disabled] {
  opacity: .4;
  pointer-events: none;
}

/* Controls panel */
.controls {
  flex: 1 1 auto;
  background: var(--bg-2);
  border-top: 1px solid var(--line);
  padding: 14px 16px 12px;
  overflow-y: auto;
}
.row {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 8px 0;
  border-bottom: 1px solid var(--line);
}
.row:last-child { border-bottom: 0; }
.row[hidden] { display: none; }

.lbl {
  display: flex;
  justify-content: space-between;
  font-size: 13px;
  color: var(--muted);
}
.lbl output {
  color: var(--fg);
  font-variant-numeric: tabular-nums;
}

/* Sliders */
input[type=range] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 36px; /* fat thumb target */
  background: transparent;
  margin: 0;
}
input[type=range]::-webkit-slider-runnable-track {
  height: 6px;
  background: var(--bg-3);
  border-radius: 3px;
}
input[type=range]::-webkit-slider-thumb {
  -webkit-appearance: none;
  height: 28px;
  width: 28px;
  border-radius: 50%;
  background: var(--accent);
  border: 3px solid #fff;
  margin-top: -11px;
  box-shadow: 0 2px 10px rgba(255,110,199,.45);
}
input[type=range]::-moz-range-track { height: 6px; background: var(--bg-3); border-radius: 3px; }
input[type=range]::-moz-range-thumb { height: 28px; width: 28px; border-radius: 50%; background: var(--accent); border: 3px solid #fff; }

/* Segmented control */
.seg {
  display: flex;
  background: var(--bg-3);
  border-radius: 10px;
  padding: 3px;
  gap: 3px;
}
.seg-btn {
  flex: 1;
  appearance: none;
  border: 0;
  background: transparent;
  color: var(--muted);
  font: inherit;
  font-weight: 500;
  padding: 9px 10px;
  border-radius: 8px;
  cursor: pointer;
}
.seg-btn.active {
  background: var(--bg);
  color: var(--fg);
  box-shadow: 0 1px 2px rgba(0,0,0,.35);
}

/* Paint color palette */
.palette {
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  gap: 8px;
}
.swatch {
  appearance: none;
  border: 2px solid transparent;
  border-radius: 50%;
  aspect-ratio: 1 / 1;
  cursor: pointer;
  padding: 0;
  box-shadow: inset 0 0 0 1px rgba(255,255,255,.12);
}
.swatch.active {
  border-color: #fff;
  box-shadow: 0 0 0 2px rgba(255,255,255,.2);
}

/* Snap chips for rotation */
.snaps {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}
.snap {
  flex: 1;
  min-width: 0;
  background: var(--bg-3);
  border: 1px solid transparent;
  color: var(--fg);
  font: inherit;
  font-size: 12px;
  padding: 6px 8px;
  border-radius: 8px;
  cursor: pointer;
}
.snap:active { background: var(--bg); border-color: var(--line); }

/* Credit line — sits above the sticky action bar and scrolls with content */
.credit {
  margin: 0;
  padding: 4px 16px 16px;
  text-align: center;
  font-size: 12px;
  color: var(--muted);
}
.credit a { color: inherit; }

/* Actions */
.actions {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 10px;
  padding: 12px 16px calc(12px + var(--safe-bottom));
  background: var(--bg-2);
  border-top: 1px solid var(--line);
  position: sticky;
  bottom: 0;
}
.action {
  appearance: none;
  border: 0;
  font: inherit;
  font-weight: 600;
  padding: 14px 16px;
  border-radius: 12px;
  cursor: pointer;
}
.action.primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #11141c;
}
.action.secondary {
  background: var(--bg-3);
  color: var(--fg);
}
.action:active { transform: scale(0.98); }

/* Toast */
.toast {
  position: fixed;
  left: 50%;
  bottom: calc(80px + var(--safe-bottom));
  transform: translateX(-50%) translateY(10px);
  background: rgba(20, 24, 35, 0.95);
  color: var(--fg);
  padding: 10px 16px;
  border-radius: 999px;
  font-size: 14px;
  border: 1px solid var(--line);
  opacity: 0;
  pointer-events: none;
  transition: opacity .2s, transform .2s;
  z-index: 100;
}
.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* Install page (shares this stylesheet) */
.install-page {
  max-width: 640px;
  margin: 0 auto;
  padding: 16px 20px 60px;
  line-height: 1.55;
}
.install-page h1 { margin: 8px 0 4px; font-size: 22px; }
.install-page h2 { margin: 24px 0 8px; font-size: 17px; color: var(--accent-2); }
.install-page p, .install-page li { color: var(--fg); }
.install-page ol { padding-left: 22px; }
.install-page li { margin-bottom: 6px; }
.install-page .back {
  color: var(--accent-2);
  text-decoration: none;
  display: inline-block;
  margin-bottom: 14px;
}
.install-page code {
  background: var(--bg-3);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 13px;
}
.install-page .hero {
  background: linear-gradient(135deg, rgba(255,110,199,.15), rgba(79,195,255,.15));
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 14px 16px;
  margin: 16px 0 8px;
}
.install-page .step {
  border-left: 2px solid var(--accent);
  padding: 4px 0 4px 14px;
  margin: 14px 0;
}
.install-page .note {
  color: var(--muted);
  font-size: 13px;
  margin-top: 8px;
}
.install-page .icn {
  display: inline-block;
  vertical-align: middle;
  width: 18px;
  height: 18px;
  border: 1px solid currentColor;
  border-radius: 4px;
  position: relative;
  margin: 0 2px;
}
.install-page .icn::after {
  content: '';
  position: absolute;
  left: 6px; right: 6px; top: 2px;
  height: 6px;
  border-left: 1.5px solid currentColor;
  border-top: 1.5px solid currentColor;
  border-right: 1.5px solid currentColor;
  border-radius: 1px;
}

@media (min-width: 720px) {
  /* On a desktop, lay out side-by-side: preview left, controls right */
  #app {
    display: grid;
    grid-template-columns: 1fr 380px;
    grid-template-rows: auto 1fr auto;
    grid-template-areas:
      "top    top"
      "stage  controls"
      "actions actions";
    max-height: 100dvh;
  }
  .topbar { grid-area: top; }
  .stage  { grid-area: stage; }
  .controls { grid-area: controls; border-top: 0; border-left: 1px solid var(--line); }
  .actions { grid-area: actions; }
}