:root {
  font-family:
    Inter,
    system-ui,
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    sans-serif;

  font-synthesis: none;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;

  --background: #121218;
  --text: #e8e8ed;
  --surface: #1c1c24;
  --border: #30303a;
  --muted: #92929e;
  --accent: #8b7cf6;
  --red: #ff4c55;
  --secondary-background: #292932;
  --secondary-border: #3a3a45;
  --secondary-text: #d0d0da;
  --progress-track: #32323c;

  color: var(--text);
  background: var(--background);
}

:root[data-theme="light"] {
  --background: #f4f4f8;
  --text: #24242d;
  --surface: #ffffff;
  --border: #dedee7;
  --muted: #707080;
  --accent: #6958df;
  --red: #d93645;
  --secondary-background: #ededf3;
  --secondary-border: #d5d5df;
  --secondary-text: #33333e;
  --progress-track: #dedee7;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-width: 600px;
  min-height: 100vh;
  background: var(--background);
  color: var(--text);
}

button,
textarea,
input {
  font: inherit;
}

.layout {
  max-width: 1000px;
  margin: 0 auto;
  padding: 36px 48px;
}

header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 32px;
}

h1 {
  font-size: 28px;
  font-weight: 700;
  letter-spacing: -0.8px;
  margin: 0;
}

.subtitle {
  margin: 6px 0 0;
  color: var(--muted);
  font-size: 14px;
}

.version {
  color: var(--muted);
  font-size: 12px;
  border: 1px solid var(--border);
  padding: 5px 10px;
  border-radius: 20px;
}

.input-section {
  margin-bottom: 24px;
}

.input-section label,
.settings label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 10px;
}

textarea {
  display: block;
  width: 100%;
  height: 130px;
  resize: vertical;
  padding: 14px;
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  outline: none;
  line-height: 1.6;
  font-size: 14px;
}

textarea:focus {
  border-color: var(--accent);
}

.input-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 8px;
}

#word-count {
  font-size: 12px;
  color: var(--muted);
}

button {
  border: 0;
  border-radius: 8px;
  cursor: pointer;
  transition: opacity 0.15s;
}

button:hover {
  opacity: 0.85;
}

.primary {
  background: var(--accent);
  color: white;
  padding: 12px 28px;
  font-weight: 600;
}

.secondary {
  color: var(--secondary-text);
  background: var(--secondary-background);
  border: 1px solid var(--secondary-border);
  padding: 10px 16px;
}

.reader {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 24px;
}

.reader-top {
  display: flex;
  justify-content: space-between;
  color: var(--muted);
  font-size: 12px;
}

.word-display {
  display: flex;
  align-items: baseline;
  justify-content: center;
  min-height: 180px;
  padding: 48px 0;
  font-size: clamp(36px, 6vw, 64px);
  font-weight: 500;
  letter-spacing: 0.5px;
  font-variant-ligatures: none;
}

.word-prefix,
.word-focus,
.word-suffix {
  white-space: pre;
}

.word-focus {
  color: var(--red);
  font-weight: 700;
}

.progress-track {
  height: 4px;
  border-radius: 4px;
  overflow: hidden;
  background: var(--progress-track);
}

#progress-bar {
  height: 100%;
  width: 0;
  background: var(--accent);
  transition: width 0.08s linear;
}

.controls {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 12px;
  margin: 24px 0 32px;
}

.settings {
  max-width: 500px;
  margin: 0 auto;
}

.speed-control {
  display: flex;
  align-items: center;
  gap: 20px;
}

input[type="range"] {
  flex: 1;
  accent-color: var(--accent);
  cursor: pointer;
}

#speed-value {
  min-width: 80px;
  font-size: 13px;
  text-align: right;
}

footer {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 24px;
  margin-top: 24px;
  color: var(--muted);
  font-size: 12px;
}

@media (max-width: 700px) {
  .layout {
    padding: 24px 18px;
  }

  .reader {
    padding: 16px;
  }

  .word-display {
    min-height: 140px;
    padding: 36px 0;
  }
}

.setting-group {
  margin-bottom: 20px;
}

.settings select {
  width: 100%;
  padding: 10px 12px;
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  outline: none;
  color-scheme: light dark;
}

.settings select option {
  color: var(--text);
  background-color: var(--surface);
}

.settings select:focus {
  border-color: var(--accent);
}

.settings-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  margin-top: 24px;
}

#settings-status {
  color: var(--muted);
  font-size: 12px;
}