*, *::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 {
  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;
  overflow: hidden;
}

.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);
}

html, body {
  overflow: auto;
}

#app {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
  min-height: 100dvh;
  padding: 4rem 1.25rem 2rem;
  width: 100%;
  max-width: 480px;
  margin: 0 auto;
}

#app h1 {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--muted);
  align-self: flex-start;
}

.output-wrap {
  width: 100%;
  display: flex;
  gap: 0.625rem;
  align-items: stretch;
}

#password {
  flex: 1;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 0.625rem;
  padding: 1rem 1.125rem;
  font-family: 'Courier New', Courier, monospace;
  font-size: clamp(0.85rem, 2.5vw, 1.1rem);
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--text);
  word-break: break-all;
  line-height: 1.5;
  min-height: 3.75rem;
  display: flex;
  align-items: center;
  user-select: text;
  cursor: text;
}

#copy-btn {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 0.625rem;
  color: var(--muted);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 0 1rem;
  cursor: pointer;
  transition: color 0.15s, border-color 0.15s;
  white-space: nowrap;
  flex-shrink: 0;
}

#copy-btn:hover,
#copy-btn.copied {
  color: var(--accent);
  border-color: var(--accent);
}

.strength-bar-wrap {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

#strength-bar {
  flex: 1;
  height: 4px;
  background: var(--border);
  border-radius: 2px;
  overflow: hidden;
}

#strength-fill {
  height: 100%;
  width: 0%;
  border-radius: 2px;
  transition: width 0.25s ease, background 0.25s ease;
}

#strength-label {
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--muted);
  min-width: 5.5rem;
  text-align: right;
  transition: color 0.25s ease;
}

.controls {
  width: 100%;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 0.625rem;
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.length-row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.length-row label {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  flex-shrink: 0;
}

#length-slider {
  flex: 1;
  -webkit-appearance: none;
  appearance: none;
  height: 4px;
  background: var(--border);
  border-radius: 2px;
  outline: none;
  cursor: pointer;
}

#length-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
  transition: transform 0.1s;
}

#length-slider::-moz-range-thumb {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--accent);
  border: none;
  cursor: pointer;
}

#length-slider:active::-webkit-slider-thumb {
  transform: scale(1.2);
}

#length-val {
  font-size: 0.85rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: var(--text);
  min-width: 1.75rem;
  text-align: right;
}

.toggles {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.toggle {
  display: flex;
  align-items: center;
  cursor: pointer;
  user-select: none;
}

.toggle input {
  display: none;
}

.toggle span {
  display: inline-block;
  padding: 0.375rem 0.75rem;
  border-radius: 0.375rem;
  border: 1px solid var(--border);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  transition: color 0.15s, border-color 0.15s, background 0.15s;
}

.toggle input:checked + span {
  color: var(--accent);
  border-color: var(--accent);
  background: rgba(244, 63, 94, 0.08);
}

#gen-btn {
  width: 100%;
  padding: 1rem;
  background: var(--accent);
  border: none;
  border-radius: 0.625rem;
  color: #fff;
  font-size: 0.8rem;
  font-weight: 800;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  cursor: pointer;
  transition: opacity 0.15s;
}

#gen-btn:hover {
  opacity: 0.88;
}

#gen-btn:active {
  opacity: 0.75;
}