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

:root {
  --bg: #1a1a2e;
  --surface: #16213e;
  --text: #e0e0e0;
  --text-dim: #8892a4;
  --accent: #7c3aed;
  --accent-hover: #6d28d9;
  --radius: 12px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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

header {
  padding: 16px 24px;
  background: var(--surface);
  border-bottom: 1px solid rgba(255,255,255,0.06);
  z-index: 10;
}

header h1 { font-size: 1.2rem; margin-bottom: 12px; font-weight: 600; }

.controls {
  display: flex; align-items: center; gap: 12px; flex-wrap: wrap;
}

.mode-tabs {
  display: flex; background: rgba(255,255,255,0.05); border-radius: 8px; overflow: hidden;
}

.tab {
  padding: 8px 16px; border: none; background: none; color: var(--text-dim);
  cursor: pointer; font-size: 0.85rem; transition: all 0.2s;
}
.tab.active { background: var(--accent); color: #fff; }
.tab:hover:not(.active) { color: var(--text); }

.control-group { display: flex; gap: 8px; align-items: center; }
.hidden { display: none !important; }

select {
  padding: 8px 12px; border-radius: 8px; border: 1px solid rgba(255,255,255,0.1);
  background: rgba(255,255,255,0.05); color: var(--text); font-size: 0.85rem;
  cursor: pointer;
}

.primary-btn {
  padding: 8px 18px; border-radius: 8px; border: none;
  background: var(--accent); color: #fff; font-size: 0.85rem;
  cursor: pointer; transition: background 0.2s; display: flex; align-items: center; gap: 6px;
}
.primary-btn:hover { background: var(--accent-hover); }

kbd {
  background: rgba(255,255,255,0.15); padding: 2px 6px; border-radius: 4px;
  font-size: 0.7rem; font-family: inherit;
}

.icon-btn {
  padding: 8px 14px; border-radius: 8px; border: 1px solid rgba(255,255,255,0.1);
  background: rgba(255,255,255,0.05); color: var(--text); cursor: pointer;
  font-size: 0.85rem; position: relative; transition: all 0.2s;
}
.icon-btn:hover { background: rgba(255,255,255,0.1); }

.export-group { position: relative; margin-left: auto; }

.dropdown {
  position: absolute; top: 100%; right: 0; margin-top: 6px;
  background: var(--surface); border: 1px solid rgba(255,255,255,0.1);
  border-radius: 8px; overflow: hidden; min-width: 160px; z-index: 20;
  box-shadow: 0 8px 30px rgba(0,0,0,0.4);
}
.dropdown button {
  display: block; width: 100%; padding: 10px 16px; border: none;
  background: none; color: var(--text); text-align: left; cursor: pointer;
  font-size: 0.85rem; transition: background 0.15s;
}
.dropdown button:hover { background: rgba(255,255,255,0.08); }

/* Palette */
main#palette-container {
  flex: 1; display: flex; overflow: hidden;
}

.color-col {
  flex: 1; display: flex; flex-direction: column; align-items: center;
  justify-content: center; position: relative; transition: flex 0.3s;
  cursor: pointer; min-width: 0;
}
.color-col:hover { flex: 1.15; }

.color-info {
  opacity: 0; transition: opacity 0.25s; text-align: center;
  pointer-events: none;
}
.color-col:hover .color-info { opacity: 1; pointer-events: auto; }

.color-value {
  display: block; padding: 6px 14px; margin: 3px 0; border-radius: 6px;
  font-family: 'SF Mono', 'Fira Code', monospace; font-size: 0.82rem;
  cursor: pointer; transition: background 0.15s; white-space: nowrap;
}
.color-value:hover { background: rgba(0,0,0,0.25); }
.color-value.light { color: #1a1a2e; }
.color-value.light:hover { background: rgba(255,255,255,0.25); }

.lock-btn {
  position: absolute; bottom: 16px; width: 40px; height: 40px;
  border-radius: 50%; border: 2px solid rgba(255,255,255,0.3);
  background: rgba(0,0,0,0.2); cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.1rem; transition: all 0.2s; opacity: 0;
}
.color-col:hover .lock-btn { opacity: 1; }
.lock-btn.locked { opacity: 1; border-color: rgba(255,255,255,0.7); background: rgba(0,0,0,0.4); }
.lock-btn.light { border-color: rgba(0,0,0,0.3); background: rgba(255,255,255,0.2); }
.lock-btn.light.locked { border-color: rgba(0,0,0,0.6); background: rgba(255,255,255,0.4); }

.hex-label {
  font-size: 1.4rem; font-weight: 700; margin-bottom: 8px;
  font-family: 'SF Mono', 'Fira Code', monospace; letter-spacing: 1px;
}

/* Toast */
.toast {
  position: fixed; bottom: 24px; left: 50%; transform: translateX(-50%);
  background: var(--surface); color: var(--text); padding: 10px 24px;
  border-radius: 8px; font-size: 0.85rem; box-shadow: 0 4px 20px rgba(0,0,0,0.4);
  border: 1px solid rgba(255,255,255,0.1); z-index: 100;
  transition: opacity 0.3s; opacity: 1;
}
.toast.hidden { opacity: 0; pointer-events: none; }

/* Responsive */
@media (max-width: 700px) {
  main#palette-container { flex-direction: column; }
  .color-col { min-height: 120px; }
  .color-col:hover { flex: 1.3; }
  .color-info { opacity: 1; pointer-events: auto; }
  .lock-btn { opacity: 1; }
  .controls { gap: 8px; }
}