:root {
  --bg: #1a1a1e;
  --surface: #25252c;
  --text: #e8e8ed;
  --muted: #8a8a96;
  --accent: #c44536;
  --control-transition: 0.4s ease;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "DM Sans", system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  overflow: hidden;
}

/* ----- Controls panel ----- */
.controls {
  position: fixed;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 2rem;
  background: var(--bg);
  transition: opacity var(--control-transition), visibility var(--control-transition);
  z-index: 10;
  overflow-y: auto;
}

.controls.hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

/* During playback: only show reader controls as a bottom bar; keep word visible */
.controls.playback-overlay {
  inset: auto auto 0 0;
  top: auto;
  left: 0;
  right: 0;
  justify-content: center;
  align-items: center;
  padding: 1rem 2rem;
  background: rgba(26, 26, 30, 0.92);
  backdrop-filter: blur(8px);
}

.controls.playback-overlay .input-section {
  display: none;
}

.input-section {
  width: 100%;
  max-width: 36rem;
  margin-bottom: 2rem;
}

.input-section label {
  display: block;
  margin-bottom: 0.5rem;
  font-size: 0.9rem;
  color: var(--muted);
}

#text-input {
  width: 100%;
  min-height: 12rem;
  padding: 1rem;
  font-size: 1rem;
  line-height: 1.5;
  background: var(--surface);
  border: 1px solid #3a3a42;
  border-radius: 8px;
  color: var(--text);
  resize: vertical;
}

#text-input::placeholder {
  color: var(--muted);
}

.upload-row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-top: 0.75rem;
}

#file-input {
  font-size: 0.9rem;
  color: var(--muted);
}

.upload-hint {
  font-size: 0.85rem;
  color: var(--muted);
}

.reader-controls {
  width: 100%;
  max-width: 28rem;
  padding: 1.5rem;
  background: var(--surface);
  border-radius: 12px;
  border: 1px solid #3a3a42;
}

.control-row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.control-row:last-child {
  margin-bottom: 0;
}

.control-row label:not(.toggle-label) {
  min-width: 7rem;
  font-size: 0.9rem;
  color: var(--muted);
}

.toggle-label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  cursor: pointer;
  font-size: 0.95rem;
}

.toggle-label input[type="checkbox"] {
  width: 1.1rem;
  height: 1.1rem;
  accent-color: var(--accent);
}

input[type="range"] {
  flex: 1;
  min-width: 0;
  height: 6px;
  background: #3a3a42;
  border-radius: 3px;
  accent-color: var(--accent);
}

#wpm-value,
#font-size-value {
  min-width: 2.5rem;
  font-variant-numeric: tabular-nums;
  color: var(--muted);
}

.playback {
  justify-content: center;
  gap: 1rem;
  margin-top: 1.25rem;
  padding-top: 1.25rem;
  border-top: 1px solid #3a3a42;
}

.playback button {
  padding: 0.6rem 1.2rem;
  font-size: 1rem;
  font-weight: 500;
  background: #3a3a42;
  border: none;
  border-radius: 8px;
  color: var(--text);
  cursor: pointer;
  transition: background 0.2s;
}

.playback button:hover {
  background: #4a4a54;
}

#play-pause {
  background: var(--accent);
  color: #fff;
}

#play-pause:hover {
  filter: brightness(1.1);
}

/* ----- Reader view ----- */
.reader {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem;
  z-index: 5;
}

.reader.hidden {
  display: none;
}

#word-display {
  font-size: 48px;
  font-weight: 600;
  line-height: 1.2;
  text-align: center;
  user-select: none;
  transition: font-size 0.15s ease;
  font-family: "JetBrains Mono", "Fira Code", "Consolas", "Liberation Mono", Menlo, monospace;
  display: flex;
  justify-content: center;
  align-items: center;
  flex-wrap: nowrap;
}

#word-display .word-before,
#word-display .word-after {
  flex: 0 0 auto;
}

#word-display .word-center {
  flex: 0 0 1ch;
  display: inline-flex;
  justify-content: center;
  align-items: center;
  min-width: 1ch;
}

#word-display .center-letter {
  color: var(--accent);
}

#word-display .word-pad {
  color: transparent;
  user-select: none;
  pointer-events: none;
}