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

:root {
  --bg: #0f0f0f;
  --surface: #1a1a1a;
  --border: rgba(255, 255, 255, 0.08);
  --text: #ffffff;
  --muted: rgba(255, 255, 255, 0.45);
  --accent: #ff6b35;
}

html, body {
  min-height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
  user-select: none;
}

.back-link {
  position: fixed;
  top: 1.2rem;
  left: 1.5rem;
  font-size: 0.65rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--muted);
  text-decoration: none;
  transition: color 0.2s ease;
  z-index: 10;
}

.back-link:hover {
  color: var(--text);
}

#install-btn {
  position: fixed;
  top: 1.2rem;
  right: 1.5rem;
  background: transparent;
  border: none;
  cursor: pointer;
  font-size: 0.65rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--muted);
  padding: 0;
  z-index: 10;
  transition: color 0.2s ease;
  -webkit-tap-highlight-color: transparent;
}

#install-btn:hover {
  color: var(--text);
}

#app {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
  padding: 5rem 1.5rem 2.5rem;
  max-width: 480px;
  margin: 0 auto;
}

#swatch {
  width: 100%;
  height: 180px;
  border-radius: 16px;
  background: #ec4899;
  cursor: pointer;
  transition: box-shadow 0.2s ease;
  box-shadow: 0 0 0 1px var(--border);
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}

#swatch::after {
  content: 'click to pick';
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.6);
  mix-blend-mode: overlay;
  pointer-events: none;
  transition: opacity 0.2s ease;
}

#swatch:hover::after {
  opacity: 0;
}

#swatch:hover {
  box-shadow: 0 0 0 2px var(--accent);
}

#color-input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
  width: 0;
  height: 0;
}

.formats {
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.format-row {
  display: grid;
  grid-template-columns: 3.5rem 1fr auto;
  align-items: center;
  gap: 0.75rem;
}

.format-row label {
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--muted);
  text-align: right;
}

.format-row input {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  font-size: 0.9rem;
  font-family: 'SF Mono', 'Fira Code', 'Cascadia Code', monospace;
  padding: 0.6rem 0.75rem;
  outline: none;
  width: 100%;
  transition: border-color 0.15s ease;
  user-select: text;
  -webkit-user-select: text;
}

.format-row input:focus {
  border-color: var(--accent);
}

.format-row input.error {
  border-color: #ef4444;
}

.format-row button {
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--muted);
  font-size: 0.65rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  cursor: pointer;
  padding: 0.6rem 0.75rem;
  white-space: nowrap;
  transition: color 0.15s ease, border-color 0.15s ease;
  -webkit-tap-highlight-color: transparent;
}

.format-row button:hover {
  color: var(--text);
  border-color: rgba(255, 255, 255, 0.2);
}

.format-row button.copied {
  color: var(--accent);
  border-color: var(--accent);
}