:root {
  --bg: #FFFFFF;
  --bg-soft: #F7F5F3;
  --ink: #1A1A1A;
  --ink-soft: #767171;
  --accent: #B98795;
  --accent-soft: #F3E6E8;
  --border: #E9E5E1;
  --card-bg: #FFFFFF;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
  overscroll-behavior: none;
  -webkit-font-smoothing: antialiased;
}

.app {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.app-header {
  padding: 30px 20px 14px;
  text-align: center;
}
.app-header .brand {
  font-family: Georgia, "Songti SC", "STSong", serif;
  font-weight: 500;
  font-size: 15px;
  letter-spacing: 5px;
  color: var(--ink);
  margin-bottom: 6px;
}
.app-header h1 {
  margin: 0;
  font-family: Georgia, "Songti SC", "STSong", serif;
  font-weight: 500;
  font-size: 26px;
  letter-spacing: 3px;
  color: var(--ink);
}
.app-header .subtitle {
  margin: 8px 0 0;
  font-size: 12px;
  letter-spacing: 1.5px;
  color: var(--ink-soft);
  text-transform: uppercase;
}

.app-main {
  flex: 1;
  display: grid;
  grid-template-columns: 1fr 190px 320px;
  gap: 20px;
  padding: 12px 32px;
  min-height: 0;
  align-items: start;
}

.stage-panel {
  display: flex;
  flex-direction: column;
  align-items: center;
  min-width: 0;
}

.stage-wrap {
  width: 100%;
  max-width: 560px;
  aspect-ratio: 1 / 1;
  border-radius: 4px;
  overflow: hidden;
  border: 1px solid var(--border);
  touch-action: none;
}

#ringCanvas {
  width: 100%;
  height: 100%;
  display: block;
  touch-action: none;
}

.ring-info {
  margin-top: 16px;
  font-size: 13px;
  letter-spacing: 0.3px;
  color: var(--ink-soft);
  text-align: center;
}

.quick-actions {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: 12px;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 20px 14px;
  min-width: 0;
  align-self: start;
}
.quick-actions.hidden { display: none; }
.quick-actions-label {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.5px;
  color: var(--ink);
  text-align: center;
}

.size-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  justify-content: center;
}
.size-buttons button {
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--ink);
  border-radius: 2px;
  padding: 6px 11px;
  font-size: 12px;
  letter-spacing: 0.3px;
  cursor: pointer;
  transition: border-color 0.15s ease, color 0.15s ease;
}
.size-buttons button:hover {
  border-color: var(--ink);
}
.size-buttons button.active {
  background: var(--ink);
  color: #fff;
  border-color: var(--ink);
}

.danger-btn {
  border: 1px solid var(--border);
  background: #fff;
  color: var(--accent);
  border-radius: 2px;
  padding: 8px 14px;
  font-size: 12px;
  letter-spacing: 0.5px;
  cursor: pointer;
  transition: border-color 0.15s ease;
}
.danger-btn:hover { border-color: var(--accent); }

.palette-panel {
  display: flex;
  flex-direction: column;
  min-width: 0;
  min-height: 0;
}

.palette-select-wrap {
  position: relative;
  margin-bottom: 16px;
}
.palette-select-wrap::after {
  content: '';
  position: absolute;
  right: 4px;
  top: 50%;
  width: 7px;
  height: 7px;
  border-right: 1px solid var(--ink);
  border-bottom: 1px solid var(--ink);
  transform: translateY(-70%) rotate(45deg);
  pointer-events: none;
}

.palette-select {
  appearance: none;
  -webkit-appearance: none;
  width: 100%;
  border: none;
  border-bottom: 1px solid var(--ink);
  background: transparent;
  color: var(--ink);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.5px;
  text-align: center;
  text-align-last: center;
  padding: 6px 22px 10px 22px;
  cursor: pointer;
  font-family: inherit;
}
.palette-select:focus { outline: none; }

.palette-grid {
  flex: 1;
  overflow-y: auto;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  padding: 4px 2px 12px;
  align-content: start;
}

.bead-swatch {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  padding: 12px 4px;
  border-radius: 2px;
  cursor: grab;
  user-select: none;
  -webkit-user-select: none;
  touch-action: none;
  background: var(--card-bg);
  border: 1px solid var(--border);
  transition: border-color 0.15s ease;
}
.bead-swatch:hover { border-color: var(--ink-soft); }
.bead-swatch:active { cursor: grabbing; }
.bead-swatch canvas {
  width: 40px;
  height: 40px;
}
.bead-swatch span {
  font-size: 10.5px;
  letter-spacing: 0.2px;
  color: var(--ink-soft);
}

.app-toolbar {
  position: sticky;
  bottom: 0;
  display: flex;
  gap: 12px;
  justify-content: center;
  padding: 16px 20px calc(18px + env(safe-area-inset-bottom));
  background: linear-gradient(180deg, rgba(255,255,255,0) 0%, var(--bg) 35%);
}
.app-toolbar.hidden { display: none; }

.ghost-btn, .primary-btn {
  border-radius: 2px;
  padding: 13px 30px;
  font-size: 13px;
  letter-spacing: 1px;
  cursor: pointer;
  border: 1px solid var(--ink);
  transition: opacity 0.15s ease;
}
.ghost-btn:hover, .primary-btn:hover { opacity: 0.75; }
.ghost-btn {
  background: var(--bg);
  color: var(--ink);
}
.primary-btn {
  background: var(--ink);
  color: #fff;
  border-color: var(--ink);
}

.drag-ghost {
  position: fixed;
  top: 0;
  left: 0;
  width: 64px;
  height: 64px;
  pointer-events: none;
  display: none;
  z-index: 999;
  filter: drop-shadow(0 4px 10px rgba(0,0,0,0.2));
}

/* ---------- 移动端自适应 ---------- */
@media (max-width: 768px) {
  .app-header { padding: 22px 16px 10px; }
  .app-header h1 { font-size: 21px; letter-spacing: 2px; }
  .app-header .brand { font-size: 12px; letter-spacing: 3px; }

  .app-main {
    grid-template-columns: 1fr;
    padding: 8px 18px;
  }

  .stage-wrap { max-width: 420px; }

  .quick-actions {
    flex-direction: row;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
  }

  .palette-panel {
    min-height: 260px;
  }
  .palette-grid {
    grid-template-columns: repeat(4, 1fr);
    max-height: 40vh;
  }

  .app-toolbar {
    padding: 12px 16px calc(14px + env(safe-area-inset-bottom));
  }
  .ghost-btn, .primary-btn {
    flex: 1;
    text-align: center;
    padding: 13px 0;
  }
}