:root {
  --bg: #1a1a2e;
  --bg-panel: #16213e;
  --bg-bar: #0f3460;
  --text: #e0e0e0;
  --text-muted: #8899aa;
  --accent: #e94560;
  --accent-soft: rgba(233, 69, 96, 0.12);
  --border: #2a2a4a;
  --ok: #3ddc97;
  --highlight: rgba(255, 213, 79, 0.6);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.55;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a {
  color: var(--accent);
}

.hero {
  text-align: center;
  padding: 3rem 1.5rem 1rem;
  max-width: 760px;
  margin: 0 auto;
}
.hero h1 {
  color: var(--accent);
  font-size: 2.6rem;
  letter-spacing: 0.5px;
}
.tagline {
  color: var(--text);
  font-size: 1.15rem;
  margin-top: 0.25rem;
}
.lede {
  color: var(--text-muted);
  margin-top: 1rem;
  font-size: 0.98rem;
}
.beta-pill {
  display: inline-block;
  background: var(--accent-soft);
  color: var(--accent);
  border: 1px solid var(--accent);
  border-radius: 999px;
  font-size: 0.72rem;
  font-weight: 700;
  padding: 0.05rem 0.55rem;
  vertical-align: middle;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

main {
  width: 100%;
  max-width: 760px;
  margin: 0 auto;
  padding: 1rem 1.5rem 3rem;
  flex: 1;
}

.panel {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.6rem;
  margin-top: 1.4rem;
}

.drop-zone {
  position: relative;
  border: 2px dashed var(--border);
  border-radius: 8px;
  padding: 2.5rem 1.5rem;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.25s, background 0.25s;
}
.drop-zone:hover,
.drop-zone.dragover {
  border-color: var(--accent);
  background: var(--accent-soft);
}
.drop-zone input {
  position: absolute;
  inset: 0;
  opacity: 0;
  cursor: pointer;
}
.drop-icon {
  font-size: 2rem;
}
.drop-text {
  color: var(--text-muted);
  margin-top: 0.4rem;
  font-size: 0.92rem;
}
.file-name {
  display: none;
  color: var(--accent);
  margin-top: 0.6rem;
  font-size: 0.9rem;
  word-break: break-all;
}

.controls {
  display: flex;
  align-items: center;
  gap: 0.9rem;
  margin-top: 1.2rem;
}
.btn {
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 6px;
  padding: 0.7rem 1.6rem;
  font-size: 0.98rem;
  font-weight: 600;
  cursor: pointer;
  transition: opacity 0.2s;
}
.btn:hover {
  opacity: 0.9;
}
.btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}
.btn-ghost {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text);
  padding: 0.5rem 1rem;
  font-size: 0.85rem;
}
.device-badge {
  font-size: 0.78rem;
  color: var(--ok);
  border: 1px solid var(--ok);
  border-radius: 999px;
  padding: 0.15rem 0.7rem;
}

.progress-wrap {
  margin-top: 1.4rem;
}
.progress-track {
  height: 12px;
  background: var(--bg-bar);
  border-radius: 999px;
  overflow: hidden;
}
.progress-bar {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--accent), #ff7a90);
  border-radius: 999px;
  transition: width 0.3s ease;
}
.progress-label {
  margin-top: 0.6rem;
  font-size: 0.9rem;
  font-weight: 600;
}
.progress-sub {
  font-size: 0.82rem;
  color: var(--text-muted);
  min-height: 1.1em;
}

.note {
  margin-top: 1.2rem;
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* --- Reader --------------------------------------------------------------- */
.reader-toolbar {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  flex-wrap: wrap;
  padding-bottom: 1rem;
  margin-bottom: 1rem;
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  background: var(--bg-panel);
  z-index: 5;
}
.icon-btn {
  padding: 0.5rem 0.7rem;
  font-size: 0.95rem;
}
.ctl {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.8rem;
  color: var(--text-muted);
}
.ctl input[type='range'] {
  width: 90px;
  accent-color: var(--accent);
}
.ctl select {
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.3rem 0.4rem;
  max-width: 180px;
  font-size: 0.8rem;
}
.reader-pos {
  margin-left: auto;
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* Full-page reader: after conversion the PDF reader takes over the window. */
body.reading .hero,
body.reading .converter,
body.reading .how,
body.reading footer {
  display: none;
}
body.reading main {
  max-width: none;
  margin: 0;
  padding: 0;
  flex: 1;
  min-height: 0;
}
body.reading .result {
  margin: 0;
  border: 0;
  border-radius: 0;
  height: 100vh;
  display: flex;
  flex-direction: column;
  padding: 0;
}
body.reading .reader-toolbar {
  border-radius: 0;
  padding: 0.7rem 1rem;
  margin-bottom: 0;
}
body.reading .voice-note {
  padding: 0 1rem;
  margin: 0.5rem 0;
}
body.reading .pdf-viewport {
  flex: 1;
  max-height: none;
  border-radius: 0;
}
body.reading .raw {
  margin: 0;
  padding: 0.5rem 1rem;
}

/* PDF read-along surface */
.pdf-viewport {
  position: relative;
  max-height: 72vh;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
  padding: 1rem 0.5rem;
  background: #2a2a3e;
  border-radius: 8px;
}
.pdf-page {
  position: relative;
  max-width: 100%;
  background: #fff;
  border-radius: 2px;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.4);
  cursor: pointer;
}
.pdf-page canvas {
  max-width: 100%;
  height: auto;
  display: block;
  border-radius: 2px;
}
/* pdf.js text layer: invisible, just for measuring word boxes */
.textLayer {
  position: absolute;
  inset: 0;
  overflow: hidden;
  opacity: 0;
  line-height: 1;
  pointer-events: none;
}
.textLayer span,
.textLayer br {
  position: absolute;
  white-space: pre;
  transform-origin: 0 0;
}
/* The word being read aloud, highlighted on the page */
.word-highlight {
  position: absolute;
  display: none;
  background: var(--highlight);
  border-radius: 3px;
  mix-blend-mode: multiply;
  pointer-events: none;
  transition: left 0.12s ease, top 0.12s ease, width 0.12s ease, height 0.12s ease;
}

.raw {
  margin-top: 1.2rem;
  border-top: 1px solid var(--border);
  padding-top: 0.8rem;
}
.raw summary {
  cursor: pointer;
  color: var(--text-muted);
  font-size: 0.88rem;
}
.result-actions {
  display: flex;
  gap: 0.5rem;
  margin: 0.8rem 0;
}
#result-text {
  width: 100%;
  min-height: 240px;
  resize: vertical;
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1rem;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.88rem;
  line-height: 1.5;
}

.how h2 {
  font-size: 1.15rem;
  margin-bottom: 0.7rem;
}
.how ol {
  padding-left: 1.2rem;
  color: var(--text-muted);
}
.how li {
  margin-bottom: 0.4rem;
}
.privacy {
  margin-top: 1rem;
  font-size: 0.85rem;
  color: var(--ok);
}

footer {
  text-align: center;
  padding: 1.5rem;
  color: var(--text-muted);
  font-size: 0.8rem;
  border-top: 1px solid var(--border);
}

/* --- Feedback widget ------------------------------------------------------ */
.fb-fab {
  position: fixed;
  right: 1.2rem;
  bottom: 1.2rem;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 999px;
  padding: 0.7rem 1.2rem;
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.35);
  z-index: 50;
}
.fb-modal {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.55);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  z-index: 60;
}
.fb-modal[hidden] {
  display: none;
}
.fb-card {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.5rem;
  width: 100%;
  max-width: 460px;
}
.fb-card h3 {
  color: var(--accent);
  margin-bottom: 0.4rem;
  font-size: 1.1rem;
}
.fb-hint {
  color: var(--text-muted);
  font-size: 0.85rem;
  margin-bottom: 1rem;
}
.fb-label {
  display: block;
  font-size: 0.8rem;
  color: var(--text-muted);
  margin: 0.6rem 0 0.3rem;
}
.fb-card select,
.fb-card textarea {
  width: 100%;
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.6rem;
  font: inherit;
}
.fb-actions {
  display: flex;
  justify-content: flex-end;
  gap: 0.5rem;
  margin-top: 1rem;
}
.fb-status {
  margin-top: 0.6rem;
  font-size: 0.82rem;
  color: var(--ok);
  min-height: 1em;
}

.hero-links {
  margin-top: 0.8rem;
  font-size: 0.85rem;
}
.hero-links a {
  color: var(--text-muted);
  text-decoration: none;
  border-bottom: 1px dotted var(--text-muted);
}
.hero-links a:hover {
  color: var(--accent);
  border-color: var(--accent);
}

.voice-note {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 0.8rem;
}
.voice-note code {
  background: var(--bg);
  padding: 0 0.25rem;
  border-radius: 3px;
}
/* Conversion-quality note (mmdlint): muted green when clean, amber on trouble. */
#lint-note {
  color: var(--ok);
}
#lint-note.lint-warn {
  color: #ffd54f;
}

/* --- Access gate ---------------------------------------------------------- */
body.gated {
  overflow: hidden;
}
.gate-overlay {
  position: fixed;
  inset: 0;
  background: var(--bg);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  z-index: 200;
}
.gate-card {
  width: 100%;
  max-width: 420px;
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 2rem;
  text-align: center;
}
.gate-logo {
  color: var(--accent);
  font-size: 2.2rem;
}
.gate-sub {
  color: var(--text-muted);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 1.4rem;
}
.gate-h {
  font-size: 1.15rem;
  margin-bottom: 0.4rem;
}
.gate-hint {
  color: var(--text-muted);
  font-size: 0.88rem;
  margin-bottom: 1.2rem;
}
#gate-form {
  display: flex;
  gap: 0.5rem;
}
#gate-input {
  flex: 1;
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.7rem;
  font: inherit;
  text-align: center;
  letter-spacing: 1px;
}
.gate-error {
  color: var(--accent);
  font-size: 0.82rem;
  min-height: 1.1em;
  margin-top: 0.7rem;
}
.gate-foot {
  margin-top: 1rem;
  font-size: 0.82rem;
  color: var(--text-muted);
}

/* --- About modal ---------------------------------------------------------- */
.about-modal {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  z-index: 80;
}
.about-modal[hidden] {
  display: none;
}
.about-card {
  position: relative;
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 2rem;
  max-width: 560px;
  max-height: 85vh;
  overflow-y: auto;
  line-height: 1.65;
}
.about-card h2 {
  color: var(--accent);
  margin-bottom: 1rem;
}
.about-card p {
  margin-bottom: 1rem;
  color: var(--text);
}
.about-close {
  position: absolute;
  top: 0.7rem;
  right: 0.9rem;
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 1.6rem;
  line-height: 1;
  cursor: pointer;
}
.about-close:hover {
  color: var(--accent);
}
.about-tag {
  border-left: 3px solid var(--accent);
  padding-left: 0.9rem;
  color: var(--text-muted) !important;
  font-style: italic;
}
.about-foot {
  font-size: 0.85rem;
  color: var(--text-muted) !important;
  margin-bottom: 0 !important;
}

@media (max-width: 520px) {
  .hero h1 {
    font-size: 2.1rem;
  }
  .panel {
    padding: 1.2rem;
  }
}