/* ===== CSS Custom Properties ===== */
:root {
  /* Typography (adjustable via JS) */
  --font-size-base: 24px;
  --line-height: 1.8;
  --letter-spacing: 0.12em;
  --word-spacing: 0.16em;
  --margin-left: 48px;
  --margin-right: 48px;

  /* Light theme (default) */
  --bg-color: #FFFFFF;
  --text-color: #000000;
  --surface-color: #F5F5F5;
  --border-color: #CCCCCC;
  --focus-color: #005A9C;
  --tab-active-color: #005A9C;
  --tab-hover-bg: #F0F0F0;
  --blockquote-border: #005A9C;
  --commentary-bg: #F9F9F9;
  --alt-line-color: #EDEDF0;
  --toggle-track-bg: #CCCCCC;
  --toggle-track-active: #005A9C;
  --slider-track: #CCCCCC;
  --slider-thumb: #005A9C;
}

/* Dark theme */
[data-theme="dark"] {
  --bg-color: #121212;
  --text-color: #F0F0F0;
  --surface-color: #1E1E1E;
  --border-color: #444444;
  --focus-color: #6CB4EE;
  --tab-active-color: #6CB4EE;
  --tab-hover-bg: #2A2A2A;
  --blockquote-border: #6CB4EE;
  --commentary-bg: #1A1A1A;
  --alt-line-color: #1E1E2A;
  --toggle-track-bg: #444444;
  --toggle-track-active: #6CB4EE;
  --slider-track: #444444;
  --slider-thumb: #6CB4EE;
}

/* Warm theme */
[data-theme="warm"] {
  --bg-color: #FFFACD;
  --text-color: #1A1A1A;
  --surface-color: #FFF8DC;
  --border-color: #D4AF37;
  --focus-color: #8B6914;
  --tab-active-color: #8B6914;
  --tab-hover-bg: #FFF0B3;
  --blockquote-border: #D4AF37;
  --commentary-bg: #FFF5D6;
  --alt-line-color: #FFF0B3;
  --toggle-track-bg: #D4AF37;
  --toggle-track-active: #8B6914;
  --slider-track: #D4AF37;
  --slider-thumb: #8B6914;
}

/* ===== Reset & Base ===== */
*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  font-family: "Atkinson Hyperlegible", "Courier New", Courier, monospace;
  font-size: var(--font-size-base);
  font-weight: 500;
  line-height: var(--line-height);
  letter-spacing: var(--letter-spacing);
  word-spacing: var(--word-spacing);
  color: var(--text-color);
  background-color: var(--bg-color);
  margin: 0;
  padding: 0;
  transition: background-color 0.3s ease, color 0.3s ease;
}

/* ===== UI Chrome — fixed sizes, not affected by reading controls ===== */
header[role="banner"],
#controls-panel,
#speech-tabs,
footer[role="contentinfo"] {
  font-size: 16px;
  letter-spacing: 0.02em;
  word-spacing: normal;
  line-height: 1.4;
}

/* ===== Screen Reader Only ===== */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ===== Skip Link ===== */
.skip-link {
  position: absolute;
  top: -100px;
  left: 1rem;
  padding: 0.75rem 1.5rem;
  background: var(--focus-color);
  color: #FFFFFF;
  font-size: 1rem;
  font-weight: 700;
  text-decoration: none;
  border-radius: 0 0 6px 6px;
  z-index: 1000;
  transition: top 0.2s ease;
}

.skip-link:focus {
  top: 0;
  outline: 3px solid var(--text-color);
  outline-offset: 2px;
}

/* ===== Focus Indicators ===== */
*:focus-visible {
  outline: 3px solid var(--focus-color);
  outline-offset: 2px;
}

/* ===== Header ===== */
header[role="banner"] {
  padding: 1rem var(--margin-right) 1rem var(--margin-left);
  text-align: left;
  position: sticky;
  top: 0;
  z-index: 200;
  background: var(--bg-color);
  border-bottom: 2px solid var(--border-color);
  transition: background-color 0.3s ease;
}

.header-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

header[role="banner"] h1 {
  font-size: 1.5rem;
  font-weight: 700;
  margin: 0;
  line-height: 1.3;
}

.subtitle {
  font-size: 0.85rem;
  margin: 0.15rem 0 0 0;
  opacity: 0.75;
}

/* ===== Settings Gear Button ===== */
#settings-toggle {
  background: none;
  border: 2px solid var(--border-color);
  border-radius: 50%;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--text-color);
  transition: all 0.2s ease;
  flex-shrink: 0;
}

#settings-toggle:hover {
  background: var(--tab-hover-bg);
}

#settings-toggle[aria-expanded="true"] {
  background: var(--tab-active-color);
  color: #FFFFFF;
  border-color: var(--tab-active-color);
}

/* ===== Controls Panel ===== */
#controls-panel {
  position: sticky;
  top: 0;
  z-index: 150;
  background: var(--surface-color);
  border-bottom: 2px solid var(--border-color);
  padding: 1.25rem 2rem;
  transition: background-color 0.3s ease;
  max-height: 80vh;
  overflow-y: auto;
}

#controls-panel[hidden] {
  display: none;
}

#controls-panel h2 {
  font-size: 1rem;
  font-weight: 700;
  margin: 0 0 1rem 0;
  line-height: 1.3;
}

.controls-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 1.25rem 2rem;
  align-items: end;
}

.control-group {
  min-width: 180px;
  border: 0;
  padding: 0;
  margin: 0;
}

.control-group label,
.control-group legend {
  display: block;
  font-size: 0.85rem;
  font-weight: 700;
  margin-bottom: 0.4rem;
  padding: 0;
}

.control-value {
  font-weight: 400;
  opacity: 0.8;
}

/* ===== Sliders ===== */
input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 8px;
  background: var(--slider-track);
  border-radius: 4px;
  cursor: pointer;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 24px;
  height: 24px;
  background: var(--slider-thumb);
  border-radius: 50%;
  border: 2px solid var(--bg-color);
  cursor: pointer;
}

input[type="range"]::-moz-range-thumb {
  width: 24px;
  height: 24px;
  background: var(--slider-thumb);
  border-radius: 50%;
  border: 2px solid var(--bg-color);
  cursor: pointer;
}

/* ===== Theme Toggle Buttons ===== */
.theme-toggle {
  display: flex;
  gap: 0.5rem;
}

.theme-toggle button {
  padding: 0.5rem 1rem;
  font-family: inherit;
  font-size: 0.85rem;
  font-weight: 600;
  border: 2px solid var(--border-color);
  background: var(--bg-color);
  color: var(--text-color);
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.theme-toggle button.active,
.theme-toggle button[aria-checked="true"] {
  background: var(--tab-active-color);
  color: #FFFFFF;
  border-color: var(--tab-active-color);
}

/* ===== Toggle Switch ===== */
.toggle-label {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  cursor: pointer;
}

button[role="switch"] {
  background: none;
  border: none;
  padding: 0;
  cursor: pointer;
  flex-shrink: 0;
}

.toggle-track {
  display: block;
  width: 48px;
  height: 26px;
  background: var(--toggle-track-bg);
  border-radius: 13px;
  position: relative;
  transition: background-color 0.2s ease;
}

button[role="switch"][aria-checked="true"] .toggle-track {
  background: var(--toggle-track-active);
}

.toggle-thumb {
  display: block;
  width: 20px;
  height: 20px;
  background: #FFFFFF;
  border-radius: 50%;
  position: absolute;
  top: 3px;
  left: 3px;
  transition: transform 0.2s ease;
}

button[role="switch"][aria-checked="true"] .toggle-thumb {
  transform: translateX(22px);
}

/* ===== Reset Button ===== */
.reset-btn {
  padding: 0.5rem 1rem;
  font-family: inherit;
  font-size: 0.85rem;
  font-weight: 600;
  border: 2px solid var(--border-color);
  background: var(--bg-color);
  color: var(--text-color);
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.reset-btn:hover {
  background: var(--tab-hover-bg);
}

/* ===== Tab Navigation ===== */
#speech-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  padding: 0 var(--margin-right) 0 var(--margin-left);
  border-bottom: 3px solid var(--border-color);
  margin: 0;
}

#speech-tabs button {
  padding: 1rem 1.5rem;
  font-family: inherit;
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: var(--letter-spacing);
  background: transparent;
  color: var(--text-color);
  border: none;
  border-bottom: 3px solid transparent;
  margin-bottom: -3px;
  cursor: pointer;
  transition: all 0.2s ease;
  white-space: nowrap;
}

#speech-tabs button:hover {
  background: var(--tab-hover-bg);
}

#speech-tabs button[aria-selected="true"] {
  border-bottom-color: var(--tab-active-color);
  font-weight: 700;
}

/* ===== Tab Panels / Speech Content ===== */
.tab-panels {
  padding: 2rem var(--margin-right) 2rem var(--margin-left);
}

article[role="tabpanel"] header {
  margin-bottom: 2rem;
}

article[role="tabpanel"] h2 {
  font-size: 1.75rem;
  font-weight: 700;
  margin: 0 0 0.5rem 0;
  line-height: 1.3;
}

.speech-meta {
  font-size: 0.9rem;
  opacity: 0.75;
  margin: 0;
}

.speech-meta .speaker {
  font-weight: 700;
}

.meta-separator {
  opacity: 0.5;
}

/* ===== Speech Text (Blockquote) ===== */
.speech-text {
  max-width: 65ch;
  text-align: left;
  margin: 0 0 3rem 0;
  padding: 0 0 0 1.5rem;
  border-left: 4px solid var(--blockquote-border);
}

.speech-text p {
  margin: 0 0 var(--line-height-spacing, 2em) 0;
}

.speech-text p:last-child {
  margin-bottom: 0;
}

/* ===== Commentary ===== */
.commentary {
  max-width: 65ch;
  background: var(--commentary-bg);
  padding: 1.5rem;
  border-radius: 8px;
  margin: 0;
  transition: background-color 0.3s ease;
}

.commentary h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin: 0 0 1rem 0;
  line-height: 1.3;
}

.commentary p {
  margin: 0 0 1.5em 0;
}

.commentary p:last-child {
  margin-bottom: 0;
}

/* ===== Alternating Line Colors ===== */
.alt-lines .alt-line-even {
  background-color: var(--alt-line-color);
  display: inline;
  padding: 0.1em 0;
}

.alt-lines .alt-line-odd {
  background-color: transparent;
  display: inline;
  padding: 0.1em 0;
}

/* ===== Footer ===== */
footer[role="contentinfo"] {
  padding: 2rem var(--margin-right) 2rem var(--margin-left);
  font-size: 0.85rem;
  opacity: 0.6;
  border-top: 1px solid var(--border-color);
  margin-top: 3rem;
}

footer p {
  margin: 0;
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
  :root {
    --margin-left: 16px;
    --margin-right: 16px;
  }

  .controls-grid {
    flex-direction: column;
    gap: 1rem;
  }

  .control-group {
    min-width: 100%;
  }

  #speech-tabs {
    flex-direction: column;
    gap: 0;
  }

  #speech-tabs button {
    border-bottom: none;
    border-left: 3px solid transparent;
    margin-bottom: 0;
    margin-left: -3px;
    text-align: left;
  }

  #speech-tabs button[aria-selected="true"] {
    border-left-color: var(--tab-active-color);
    border-bottom-color: transparent;
  }

  .speech-text,
  .commentary {
    max-width: 100%;
  }
}

@media (max-width: 480px) {
  header[role="banner"] h1 {
    font-size: 1.5rem;
  }

  article[role="tabpanel"] h2 {
    font-size: 1.35rem;
  }
}