@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600&display=swap');

:root {
  --background: hsl(0 0% 96%);
  --foreground: hsl(0 0% 9%);
  --card: hsl(0 0% 100%);
  --border: hsl(0 0% 87%);
  --ring: hsl(0 0% 9%);
  --primary: hsl(0 0% 9%);
  --primary-foreground: hsl(0 0% 98%);
  --muted: hsl(0 0% 93%);
  --muted-foreground: hsl(0 0% 45%);
  --radius: 6px;
  --cell-size: 28px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  font-family: 'Inter', sans-serif;
  background: var(--background);
  color: var(--foreground);
  height: 100vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

/* ─── Header ──────────────────────────────────────────── */

.app-header {
  background: linear-gradient(135deg, hsl(0 0% 8%) 0%, hsl(260 20% 14%) 50%, hsl(330 15% 12%) 100%);
  color: #fff;
  flex-shrink: 0;
  padding: 0 16px;
  overflow: hidden;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 0;
  max-width: 100%;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 12px;
}

.header-logo-wrap {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255, 255, 255, 0.08);
  border-radius: 10px;
  padding: 2px;
  flex-shrink: 0;
}

.header-logo {
  display: block;
  filter: drop-shadow(0 1px 3px rgba(0,0,0,0.3));
}

.header-text {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.header-title {
  font-size: 15px;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.15;
}

.header-subtitle {
  font-size: 11px;
  font-weight: 400;
  opacity: 0.55;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  line-height: 1.2;
}

/* Header right side */
.header-right {
  display: flex;
  align-items: center;
  gap: 16px;
}

/* Decorative bead chain */
.header-deco {
  display: flex;
  align-items: center;
  gap: 0;
  opacity: 0.45;
}

.deco-bead {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--c);
  flex-shrink: 0;
  box-shadow: 0 0 4px rgba(255,255,255,0.15);
}

.deco-wire {
  width: 14px;
  height: 0;
  border-top: 1.5px solid rgba(255, 255, 255, 0.5);
  flex-shrink: 0;
}

/* Credits */
.header-credits {
  display: flex;
  align-items: center;
  gap: 8px;
  padding-left: 16px;
  border-left: 1px solid rgba(255, 255, 255, 0.15);
}

.credit-name {
  font-size: 12px;
  font-weight: 500;
  opacity: 0.7;
}

.credit-links {
  display: flex;
  align-items: center;
  gap: 6px;
}

.credit-link {
  color: rgba(255, 255, 255, 0.5);
  transition: color 0.15s, transform 0.15s;
  display: flex;
  align-items: center;
}
.credit-link:hover {
  color: #fff;
  transform: scale(1.15);
}

@media (max-width: 600px) {
  .header-deco { display: none; }
}

/* ─── Toolbar ──────────────────────────────────────────── */

.toolbar {
  background: var(--card);
  border-bottom: 1px solid var(--border);
  padding: 8px 16px;
  flex-shrink: 0;
}

.toolbar-row {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.toolbar-row + .toolbar-row { margin-top: 8px; }

.toolbar-group {
  display: flex;
  align-items: center;
  gap: 5px;
}

.separator {
  width: 1px;
  height: 22px;
  background: var(--border);
  flex-shrink: 0;
}

.palette-label,
.option-label {
  font-size: 12px;
  font-weight: 500;
  color: var(--muted-foreground);
  white-space: nowrap;
}

/* Buttons */
.tool-btn {
  font-family: inherit;
  font-size: 12px;
  font-weight: 500;
  padding: 5px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--card);
  color: var(--foreground);
  cursor: pointer;
  transition: background 0.12s, border-color 0.12s, color 0.12s;
}
.tool-btn:hover { background: var(--muted); }
.tool-btn.active {
  background: var(--primary);
  color: var(--primary-foreground);
  border-color: var(--primary);
}

.twist-btn {
  font-family: inherit;
  font-size: 12px;
  font-weight: 500;
  padding: 3px 10px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--card);
  color: var(--foreground);
  cursor: pointer;
  transition: background 0.12s;
}
.twist-btn:hover { background: var(--muted); }
.twist-btn.active {
  background: var(--primary);
  color: var(--primary-foreground);
  border-color: var(--primary);
}

.num-input {
  font-family: inherit;
  font-size: 12px;
  width: 48px;
  padding: 3px 6px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--card);
  color: var(--foreground);
  text-align: center;
}

.action-btn,
.export-btn {
  font-family: inherit;
  font-size: 11px;
  font-weight: 500;
  padding: 4px 10px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--card);
  color: var(--muted-foreground);
  cursor: pointer;
  transition: background 0.12s, color 0.12s;
}
.action-btn:hover,
.export-btn:hover {
  background: var(--muted);
  color: var(--foreground);
}
.action-btn.danger { color: hsl(0 60% 50%); border-color: hsl(0 40% 80%); }
.action-btn.danger:hover { background: hsl(0 60% 96%); color: hsl(0 60% 40%); }
.action-btn.toggle-on {
  background: var(--primary);
  color: var(--primary-foreground);
  border-color: var(--primary);
}

/* Swatches */
.swatch {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  border: 1.5px solid var(--border);
  cursor: pointer;
  transition: box-shadow 0.12s, border-color 0.12s;
  padding: 0;
  flex-shrink: 0;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  font-weight: 700;
  line-height: 1;
  color: transparent;
  overflow: hidden;
}
.swatch:hover { box-shadow: 0 0 0 2px var(--muted-foreground); }
.swatch.active { box-shadow: 0 0 0 2px var(--ring); border-color: var(--ring); }

/* Wire swatch dash indicator (colorblind) */
.swatch .wire-dash {
  position: absolute;
  inset: 0;
  display: none;
}
.swatch .wire-dash svg {
  width: 100%;
  height: 100%;
}

input[type="color"] {
  width: 22px;
  height: 22px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  cursor: pointer;
  padding: 1px;
  background: var(--card);
}

.option-group { display: none; }
.option-group.visible { display: flex; align-items: center; gap: 5px; }

/* ─── Editor / Grid ────────────────────────────────────── */

.editor {
  position: relative;
  flex: 1;
  overflow: hidden;
}

.grid {
  display: grid;
  position: relative;
  z-index: 1;
  background: var(--card);
  user-select: none;
  -webkit-user-select: none;
}

.cell {
  width: var(--cell-size);
  height: var(--cell-size);
  border: 1px solid hsl(0 0% 93%);
  display: flex;
  align-items: center;
  justify-content: center;
}
.cell:hover { background: hsl(0 0% 96%); }

/* Bead — flat */
.bead {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  pointer-events: none;
  border: 1.5px solid rgba(0, 0, 0, 0.1);
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}

.bead-symbol {
  font-size: 11px;
  line-height: 1;
  pointer-events: none;
  font-weight: 600;
}

/* Canvas overlay */
#wire-canvas {
  position: absolute;
  top: 0;
  left: 0;
  z-index: 2;
  pointer-events: none;
}