:root {
  --font-display: 'Zodiak', Georgia, serif;
  --font-body: 'General Sans', 'Work Sans', system-ui, sans-serif;

  --ink: #f5ecdd;
  --ink-dim: rgba(245, 236, 221, 0.62);
  --accent: #e8a15c;
  --accent-soft: rgba(232, 161, 92, 0.35);
  --cool: #8fb6c9;

  --glass-bg: rgba(24, 16, 26, 0.42);
  --glass-bg-strong: rgba(20, 13, 22, 0.62);
  --glass-border: rgba(255, 255, 255, 0.09);
  --glass-blur: 18px;

  --radius-lg: 22px;
  --radius-md: 14px;
  --radius-full: 999px;

  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
  overscroll-behavior: none;
  background: #1a1120;
  font-family: var(--font-body);
  color: var(--ink);
  -webkit-tap-highlight-color: transparent;
  touch-action: none;
}

#sky {
  position: fixed;
  inset: 0;
  z-index: 0;
  background:
    radial-gradient(120% 70% at 50% 0%, rgba(255, 200, 150, 0.10), transparent 60%),
    linear-gradient(180deg,
      #1c1226 0%,
      #2c1a36 22%,
      #4a2748 42%,
      #7a3d54 58%,
      #b1603f 74%,
      #d9873f 86%,
      #6c3a2c 100%
    );
}

#glow {
  position: fixed;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  opacity: 0;
  transition: opacity 900ms var(--ease);
  background: radial-gradient(closest-side, rgba(255, 214, 165, 0.16), transparent 70%);
}
#glow.on { opacity: 1; }

canvas {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
}
#sandCanvas {
  z-index: 2;
  image-rendering: pixelated;
  image-rendering: crisp-edges;
}
#vesselBack { z-index: 1; }
#vesselFront { z-index: 3; pointer-events: none; }

#brushCursor {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 5;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  border: 1.4px solid rgba(255,255,255,0.55);
  box-shadow: 0 0 14px 2px rgba(255,255,255,0.14);
  pointer-events: none;
  opacity: 0;
  transition: opacity 200ms ease, background 200ms ease;
  will-change: transform, opacity;
}
#brushCursor.erase {
  border-color: rgba(143, 182, 201, 0.75);
  box-shadow: 0 0 14px 2px rgba(143, 182, 201, 0.18);
}

/* Intro */
#intro {
  position: fixed;
  inset: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(16, 10, 18, 0.32);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  transition: opacity 900ms var(--ease), visibility 900ms;
}
#intro.hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}
.intro-inner {
  text-align: center;
  padding: 48px 40px;
  max-width: 420px;
}
.intro-mark { color: var(--accent); margin-bottom: 18px; }
#intro h1 {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(2.2rem, 6vw, 3rem);
  margin: 0 0 10px;
  letter-spacing: 0.01em;
}
#intro p {
  font-size: 0.95rem;
  color: var(--ink-dim);
  margin: 0 0 28px;
  line-height: 1.5;
}
#beginBtn {
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 500;
  color: #241531;
  background: var(--accent);
  border: none;
  padding: 13px 38px;
  border-radius: var(--radius-full);
  cursor: pointer;
  letter-spacing: 0.02em;
  box-shadow: 0 8px 30px -8px rgba(232, 161, 92, 0.55);
  transition: transform 220ms var(--ease), box-shadow 220ms var(--ease);
}
#beginBtn:hover { transform: translateY(-1px) scale(1.02); box-shadow: 0 10px 34px -6px rgba(232, 161, 92, 0.65); }
#beginBtn:active { transform: translateY(0) scale(0.98); }
.intro-hint {
  margin-top: 18px !important;
  font-size: 0.72rem !important;
  opacity: 0.5;
}

#gestureHint {
  position: fixed;
  bottom: calc(96px + env(safe-area-inset-bottom, 0px));
  left: 50%;
  transform: translateX(-50%);
  z-index: 20;
  font-size: 0.78rem;
  letter-spacing: 0.02em;
  color: var(--ink-dim);
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border: 1px solid var(--glass-border);
  padding: 8px 16px;
  border-radius: var(--radius-full);
  opacity: 0;
  transition: opacity 1200ms var(--ease);
  pointer-events: none;
  white-space: nowrap;
}
#gestureHint.show { opacity: 1; }

/* Dock */
#dock {
  position: fixed;
  left: 50%;
  bottom: calc(22px + env(safe-area-inset-bottom, 0px));
  transform: translateX(-50%);
  z-index: 30;
  display: flex;
  gap: 4px;
  padding: 6px;
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur)) saturate(140%);
  -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(140%);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-full);
  box-shadow: 0 12px 40px -12px rgba(0,0,0,0.5);
  opacity: 0;
  transform: translateX(-50%) translateY(10px);
  transition: opacity 900ms var(--ease), transform 900ms var(--ease), filter 600ms ease;
}
#dock.visible { opacity: 1; transform: translateX(-50%) translateY(0); }
#dock.idle { opacity: 0.32; }
#dock.zen-hidden {
  opacity: 0 !important;
  transform: translateX(-50%) translateY(16px) !important;
  pointer-events: none;
}

.dock-btn {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  border: none;
  background: transparent;
  color: var(--ink);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: background 200ms ease, color 200ms ease;
}
.dock-btn:hover { background: rgba(255,255,255,0.08); }
.dock-btn.active { background: var(--accent-soft); color: var(--accent); }

.swatch {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  border: 1.5px solid rgba(255,255,255,0.45);
  background: var(--accent);
  display: block;
}

/* Panels */
.panel {
  position: fixed;
  left: 50%;
  bottom: calc(78px + env(safe-area-inset-bottom, 0px));
  transform: translateX(-50%) translateY(8px);
  z-index: 29;
  min-width: 260px;
  max-width: min(88vw, 340px);
  background: var(--glass-bg-strong);
  backdrop-filter: blur(var(--glass-blur)) saturate(140%);
  -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(140%);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: 16px;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity 220ms var(--ease), transform 220ms var(--ease), visibility 220ms;
  box-shadow: 0 20px 50px -18px rgba(0,0,0,0.6);
}
.panel.open {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: translateX(-50%) translateY(0);
}
#dock.zen-hidden ~ .panel { opacity: 0 !important; visibility: hidden !important; pointer-events: none !important; }

.panel-tabs {
  display: flex;
  gap: 2px;
  margin-bottom: 12px;
  background: rgba(0,0,0,0.2);
  border-radius: var(--radius-full);
  padding: 3px;
}
.tab-btn {
  flex: 1;
  border: none;
  background: transparent;
  color: var(--ink-dim);
  font-family: var(--font-body);
  font-size: 0.72rem;
  padding: 7px 0;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: background 200ms ease, color 200ms ease;
}
.tab-btn.active { background: rgba(255,255,255,0.12); color: var(--ink); }

.palette-names {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 12px;
}
.palette-chip {
  font-size: 0.68rem;
  padding: 5px 11px;
  border-radius: var(--radius-full);
  background: rgba(255,255,255,0.06);
  border: 1px solid transparent;
  color: var(--ink-dim);
  cursor: pointer;
  transition: all 180ms ease;
}
.palette-chip.active {
  background: var(--accent-soft);
  border-color: rgba(232,161,92,0.5);
  color: var(--ink);
}
.swatch-row { display: flex; gap: 9px; flex-wrap: wrap; }
.swatch-btn {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  cursor: pointer;
  border: 2px solid transparent;
  transition: transform 150ms ease, border-color 150ms ease;
}
.swatch-btn:hover { transform: scale(1.1); }
.swatch-btn.active { border-color: #fff; transform: scale(1.12); }

.panel-note {
  font-size: 0.74rem;
  color: var(--ink-dim);
  margin: 0;
  line-height: 1.4;
}
.rainbow-preview {
  margin-top: 10px;
  height: 14px;
  border-radius: var(--radius-full);
  background: linear-gradient(90deg, red, orange, yellow, lime, cyan, blue, magenta, red);
}
.layer-strip {
  margin-top: 12px;
  display: flex;
  height: 18px;
  border-radius: var(--radius-full);
  overflow: hidden;
  gap: 2px;
}
.layer-seg {
  flex: 1;
  opacity: 0.45;
  transition: opacity 300ms ease, transform 300ms ease;
}
.layer-seg.current {
  opacity: 1;
  transform: scaleY(1.25);
}
#tabPicker { display: flex; align-items: center; gap: 12px; }
#colorPicker {
  width: 44px; height: 44px;
  border: none;
  border-radius: 50%;
  overflow: hidden;
  background: transparent;
  cursor: pointer;
  padding: 0;
}
#colorPicker::-webkit-color-swatch-wrapper { padding: 0; }
#colorPicker::-webkit-color-swatch { border: 2px solid rgba(255,255,255,0.4); border-radius: 50%; }

.shape-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
}
.shape-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 5px;
  background: rgba(255,255,255,0.05);
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  padding: 9px 4px 7px;
  cursor: pointer;
  color: var(--ink-dim);
  transition: all 180ms ease;
}
.shape-btn svg { color: var(--ink); opacity: 0.85; }
.shape-btn span { font-size: 0.6rem; letter-spacing: 0.01em; }
.shape-btn:hover { background: rgba(255,255,255,0.1); }
.shape-btn.active {
  background: var(--accent-soft);
  border-color: rgba(232,161,92,0.5);
  color: var(--ink);
}

.setting-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 6px 0;
  font-size: 0.78rem;
  color: var(--ink-dim);
}
.setting-row + .setting-row { border-top: 1px solid rgba(255,255,255,0.07); }
.setting-row[hidden] { display: none; }
.setting-row input[type="range"] {
  flex: 1;
  accent-color: var(--accent);
}
.mini-btn {
  font-size: 0.68rem;
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.12);
  color: var(--ink);
  padding: 5px 12px;
  border-radius: var(--radius-full);
  cursor: pointer;
}
.toggle-switch {
  width: 38px;
  height: 22px;
  border-radius: var(--radius-full);
  background: rgba(255,255,255,0.14);
  border: none;
  position: relative;
  cursor: pointer;
  transition: background 200ms ease;
  flex-shrink: 0;
}
.toggle-switch[aria-checked="true"] { background: var(--accent); }
.toggle-knob {
  position: absolute;
  top: 2px; left: 2px;
  width: 18px; height: 18px;
  border-radius: 50%;
  background: #fff;
  transition: transform 200ms var(--ease);
}
.toggle-switch[aria-checked="true"] .toggle-knob { transform: translateX(16px); }

/* Zen exit glyph */
#zenExit {
  position: fixed;
  bottom: calc(14px + env(safe-area-inset-bottom, 0px));
  right: calc(14px + env(safe-area-inset-right, 0px));
  z-index: 31;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  border: none;
  background: rgba(255,255,255,0.06);
  opacity: 0;
  pointer-events: none;
  cursor: pointer;
  transition: opacity 400ms ease;
}
#zenExit::before {
  content: '';
  position: absolute;
  inset: 0;
  margin: auto;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: rgba(255,255,255,0.5);
}
#zenExit.show { opacity: 0.4; pointer-events: auto; }
#zenExit.show:hover { opacity: 0.8; }

@media (max-width: 640px) {
  .panel { max-width: 92vw; bottom: calc(76px + env(safe-area-inset-bottom, 0px)); }
  #gestureHint { bottom: calc(88px + env(safe-area-inset-bottom, 0px)); font-size: 0.7rem; }
  .shape-grid { grid-template-columns: repeat(3, 1fr); }
}

@media (prefers-reduced-motion: reduce) {
  * { transition-duration: 60ms !important; }
}