/* PDF Talker - vanilla CSS */

:root {
  --color-bg: #fafafa;
  --color-surface: #ffffff;
  --color-surface-alt: #f1f1ef;
  --color-text: #1a1a1a;
  --color-text-secondary: #5a5a55;
  --color-text-tertiary: #8a8a85;
  --color-border: rgba(0, 0, 0, 0.12);
  --color-border-strong: rgba(0, 0, 0, 0.25);
  --color-accent: #c15f3c;
  --color-accent-bg: rgba(193, 95, 60, 0.08);
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 2px 8px rgba(0, 0, 0, 0.08);
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --header-height: 52px;
  --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  --font-display: "Charter", "Iowan Old Style", "Palatino Linotype", Georgia, serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #181816;
    --color-surface: #22221f;
    --color-surface-alt: #2a2a27;
    --color-text: #ebebe8;
    --color-text-secondary: #a8a8a3;
    --color-text-tertiary: #6a6a65;
    --color-border: rgba(255, 255, 255, 0.1);
    --color-border-strong: rgba(255, 255, 255, 0.2);
    --color-accent: #e0825e;
    --color-accent-bg: rgba(224, 130, 94, 0.15);
  }
}

* { box-sizing: border-box; }

[hidden] { display: none !important; }

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  overflow: hidden;
}

body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -webkit-tap-highlight-color: transparent;
}

button {
  font-family: inherit;
  font-size: inherit;
  cursor: pointer;
  border: none;
  background: none;
  color: inherit;
  padding: 0;
}

/* ===== Header ===== */
.app-header {
  height: calc(var(--header-height) + env(safe-area-inset-top));
  padding: env(safe-area-inset-top) 16px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
}

.app-header h1 {
  margin: 0;
  font-size: 17px;
  font-weight: 600;
  font-family: var(--font-display);
  letter-spacing: -0.01em;
}

.header-actions { display: flex; gap: 8px; }

/* ===== Buttons ===== */
.btn-primary {
  background: var(--color-text);
  color: var(--color-bg);
  padding: 7px 16px;
  border-radius: var(--radius-md);
  font-size: 14px;
  font-weight: 500;
  transition: opacity 0.15s;
}
.btn-primary:hover { opacity: 0.85; }
.btn-primary:active { transform: scale(0.97); }

.btn-icon {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  font-size: 18px;
  color: var(--color-text-secondary);
  transition: background 0.15s;
}
.btn-icon:hover { background: var(--color-surface-alt); color: var(--color-text); }

.btn-small {
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  font-size: 13px;
  font-weight: 500;
  background: var(--color-text);
  color: var(--color-bg);
}
.btn-secondary {
  background: transparent;
  color: var(--color-text);
  border: 1px solid var(--color-border-strong);
}

.btn-play {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: var(--color-text);
  color: var(--color-bg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  transition: transform 0.1s, background 0.15s;
}
.btn-play:hover { background: var(--color-accent); }
.btn-play:active { transform: scale(0.94); }
.play-icon, .pause-icon { line-height: 1; }

/* ===== Main layout ===== */
.app-main {
  display: flex;
  height: calc(100vh - var(--header-height) - env(safe-area-inset-top));
  position: relative;
}

.sidebar {
  width: 280px;
  background: var(--color-surface);
  border-right: 1px solid var(--color-border);
  overflow-y: auto;
  flex-shrink: 0;
  transition: transform 0.25s ease;
}

.sidebar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 16px;
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  background: var(--color-surface);
  z-index: 1;
}

.sidebar-header h2 {
  margin: 0;
  font-size: 13px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-secondary);
}

#close-sidebar { display: none; }

.outline-tree { padding: 8px 4px 16px; }

.outline-item {
  padding: 8px 12px;
  margin: 1px 4px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  line-height: 1.4;
  color: var(--color-text);
  cursor: pointer;
  transition: background 0.1s;
  word-wrap: break-word;
}
.outline-item:hover { background: var(--color-surface-alt); }
.outline-item.active {
  background: var(--color-accent-bg);
  color: var(--color-accent);
  font-weight: 500;
}

.outline-children {
  padding-left: 14px;
  border-left: 1px dashed var(--color-border);
  margin-left: 16px;
}

.empty-state {
  text-align: center;
  color: var(--color-text-tertiary);
  font-size: 13px;
  padding: 32px 16px;
  margin: 0;
}

/* ===== Reader ===== */
.reader {
  flex: 1;
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
  min-width: 0;
}

.reader-empty {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 40px 24px;
  max-width: 540px;
  margin: 0 auto;
}

.reader-empty h2 {
  font-family: var(--font-display);
  font-size: 26px;
  font-weight: 600;
  line-height: 1.2;
  margin: 0 0 12px;
  letter-spacing: -0.01em;
}

.reader-empty p {
  color: var(--color-text-secondary);
  font-size: 16px;
  margin: 0 0 24px;
}

.reader-empty .hint {
  font-size: 13px;
  color: var(--color-text-tertiary);
  margin-top: 16px;
}

.reader-content {
  flex: 1;
  overflow-y: auto;
  padding: 16px 24px 24px;
  max-width: 760px;
  margin: 0 auto;
  width: 100%;
}

.reader-meta {
  display: flex;
  align-items: center;
  gap: 10px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: 16px;
}

#toggle-sidebar { display: none; }

.doc-title {
  flex: 1;
  font-size: 13px;
  color: var(--color-text-secondary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.page-indicator {
  font-size: 12px;
  color: var(--color-text-tertiary);
  font-variant-numeric: tabular-nums;
}

.text-view {
  font-family: var(--font-display);
  font-size: 17px;
  line-height: 1.75;
  color: var(--color-text);
  padding-bottom: 40px;
}

.sentence {
  cursor: pointer;
  padding: 1px 2px;
  border-radius: 3px;
  transition: background 0.1s;
}
.sentence:hover { background: var(--color-surface-alt); }
.sentence.active {
  background: var(--color-accent-bg);
  color: var(--color-accent);
}
.sentence.skipped {
  color: var(--color-text-tertiary);
  font-size: 0.85em;
  opacity: 0.6;
}

/* ===== Reader controls (bottom dock) ===== */
.reader-controls {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding: 10px 16px calc(10px + env(safe-area-inset-bottom));
  flex-shrink: 0;
}

.control-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
}

.primary-controls { margin-bottom: 8px; }

.settings-controls {
  flex-wrap: wrap;
  gap: 14px;
  font-size: 13px;
}

.control-label {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--color-text-secondary);
  white-space: nowrap;
}
.control-label.checkbox-label { cursor: pointer; }

.control-label select,
.control-label input[type="range"] {
  font-family: inherit;
  font-size: 13px;
  color: var(--color-text);
  background: var(--color-surface-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 4px 8px;
}
.control-label select { max-width: 180px; }
.control-label input[type="range"] {
  padding: 0;
  width: 100px;
  background: transparent;
}

#rate-display {
  font-variant-numeric: tabular-nums;
  color: var(--color-text);
  font-weight: 500;
  min-width: 32px;
}

/* ===== Resume banner / toast ===== */
.resume-banner {
  position: fixed;
  bottom: calc(20px + env(safe-area-inset-bottom));
  left: 50%;
  transform: translateX(-50%);
  background: var(--color-text);
  color: var(--color-bg);
  padding: 12px 16px;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  display: flex;
  align-items: center;
  gap: 16px;
  font-size: 14px;
  z-index: 100;
  max-width: calc(100vw - 32px);
}
.resume-banner .resume-actions { display: flex; gap: 8px; }
.resume-banner .btn-small { background: var(--color-bg); color: var(--color-text); }
.resume-banner .btn-secondary {
  background: transparent;
  color: var(--color-bg);
  border-color: var(--color-bg);
}

.toast {
  position: fixed;
  bottom: calc(20px + env(safe-area-inset-bottom));
  left: 50%;
  transform: translateX(-50%);
  background: var(--color-text);
  color: var(--color-bg);
  padding: 10px 16px;
  border-radius: var(--radius-md);
  font-size: 13px;
  box-shadow: var(--shadow-md);
  z-index: 100;
  animation: toast-fade 3s ease forwards;
}

@keyframes toast-fade {
  0% { opacity: 0; transform: translate(-50%, 10px); }
  10% { opacity: 1; transform: translate(-50%, 0); }
  90% { opacity: 1; transform: translate(-50%, 0); }
  100% { opacity: 0; transform: translate(-50%, 10px); }
}

/* ===== Mobile ===== */
@media (max-width: 720px) {
  :root { --header-height: 44px; }

  .app-header { padding: env(safe-area-inset-top) 10px 0; }
  .app-header h1 { font-size: 15px; }
  .btn-primary { padding: 6px 12px; font-size: 13px; }

  .sidebar {
    position: absolute;
    top: 0;
    left: 0;
    height: 100%;
    z-index: 10;
    width: 85%;
    max-width: 320px;
    transform: translateX(-100%);
    box-shadow: var(--shadow-md);
  }
  .sidebar.open { transform: translateX(0); }

  #close-sidebar,
  #toggle-sidebar { display: flex; }

  .reader-empty { padding: 24px 18px; }
  .reader-empty h2 { font-size: 20px; }
  .reader-empty p { font-size: 14px; margin-bottom: 18px; }
  .reader-empty .hint { font-size: 12px; }

  .reader-content { padding: 10px 14px 14px; }
  .text-view { font-size: 16px; line-height: 1.65; }

  .reader-controls { padding: 8px 12px calc(8px + env(safe-area-inset-bottom)); }
  .primary-controls { margin-bottom: 6px; gap: 16px; }
  .btn-play { width: 48px; height: 48px; font-size: 16px; }

  .settings-controls {
    flex-direction: column;
    align-items: stretch;
    gap: 8px;
  }
  .settings-controls .control-label {
    justify-content: space-between;
    font-size: 12px;
  }
  .settings-controls .control-label select { max-width: 60%; min-width: 0; flex: 1; }
  .settings-controls .control-label input[type="range"] { width: 60%; flex: 1; }
}

.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;
}