:root {
  --bg: #000000;
  --surface: #0b0b0b;
  --surface-strong: #121212;
  --border: rgba(255, 255, 255, 0.12);
  --text: #ffffff;
  --muted: rgba(255, 255, 255, 0.72);
  --accent: #ff8a00;
  --shadow: 0 24px 80px rgba(0, 0, 0, 0.45);
  --radius: 24px;
  --transition: 260ms cubic-bezier(0.22, 1, 0.36, 1);
  --reader-size: clamp(3rem, 10vw, 7rem);
  --anchor-track: min(88vw, 34ch);
}

* {
  box-sizing: border-box;
}

html,
body {
  min-height: 100%;
}

body {
  margin: 0;
  min-height: 100dvh;
  background: var(--bg);
  color: var(--text);
  font-family: Inter, "Noto Sans SC", "Noto Sans TC", "PingFang SC", "PingFang TC", "Microsoft YaHei", "Microsoft JhengHei", system-ui, sans-serif;
  transition: background var(--transition), color var(--transition);
  overflow-x: hidden;
  overflow-y: auto;
  -webkit-tap-highlight-color: transparent;
}

button,
input,
textarea,
select {
  font: inherit;
  color: inherit;
}

button {
  cursor: pointer;
  touch-action: manipulation;
}

input,
textarea,
select,
button {
  border: 1px solid var(--border);
}

input:focus,
textarea:focus,
select:focus,
button:focus {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

body.focus-active {
  overflow: hidden;
}

.app-shell {
  min-height: 100dvh;
  padding:
    max(3rem, env(safe-area-inset-top))
    max(3rem, env(safe-area-inset-right))
    calc(6.5rem + env(safe-area-inset-bottom))
    max(3rem, env(safe-area-inset-left));
  display: flex;
  align-items: center;
  justify-content: center;
  transition: opacity var(--transition), transform var(--transition), filter var(--transition);
}

body.focus-active .app-shell {
  opacity: 0;
  transform: scale(0.985);
  filter: blur(10px);
  pointer-events: none;
}

.panel {
  background: linear-gradient(180deg, var(--surface), var(--surface-strong));
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  backdrop-filter: blur(20px);
}

.app-panel {
  width: min(1100px, 100%);
  padding: 2rem;
}

.hero {
  margin-bottom: 1.75rem;
}

.eyebrow {
  margin: 0 0 0.75rem;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
}

.hero h1 {
  margin: 0;
  font-size: clamp(2rem, 4vw, 3.5rem);
  line-height: 1;
}

.hero-copy {
  margin: 0.9rem 0 0;
  max-width: 60ch;
  line-height: 1.55;
  color: var(--muted);
}

.grid {
  display: grid;
  grid-template-columns: minmax(0, 1.3fr) minmax(320px, 0.85fr);
  gap: 1.5rem;
}

.field-block {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.field-block-large {
  min-height: 100%;
}

.label,
.footnote-label {
  font-size: 0.95rem;
  font-weight: 600;
}

.textarea,
.input,
.footnote-select {
  width: 100%;
  border-radius: 18px;
  background: var(--surface-strong);
  color: var(--text);
  transition: border-color var(--transition), background var(--transition), transform var(--transition);
}

.textarea {
  min-height: 360px;
  resize: vertical;
  padding: 1rem 1.05rem;
  line-height: 1.6;
}

.input,
.footnote-select {
  padding: 0.85rem 0.95rem;
}

.input-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 0.8rem;
  align-items: center;
}

.unit {
  color: var(--muted);
  font-weight: 700;
}

.input-actions {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  flex-wrap: wrap;
}

#fileInput {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
  pointer-events: none;
}

.button {
  border-radius: 999px;
  padding: 0.95rem 1.2rem;
  font-weight: 700;
  transition: transform var(--transition), background var(--transition), border-color var(--transition), color var(--transition);
}

.button:hover {
  transform: translateY(-1px);
}

.primary-button {
  background: var(--accent);
  color: #000000;
  border-color: transparent;
}

.secondary-button {
  background: transparent;
  color: var(--text);
}

.file-name {
  color: var(--muted);
}

.config-grid {
  display: grid;
  gap: 1.2rem;
  align-content: start;
}

.stats-block {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.85rem;
}

.stat-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.stat-label {
  color: var(--muted);
  font-size: 0.85rem;
}

.stat-value {
  font-size: 1.4rem;
}

.action-block {
  margin-top: auto;
}

.footer-control {
  position: fixed;
  bottom: calc(1rem + env(safe-area-inset-bottom));
  z-index: 20;
  display: grid;
  gap: 0.45rem;
  align-items: end;
  transition: opacity var(--transition), transform var(--transition), filter var(--transition);
}

.footer-control-left {
  left: max(1rem, env(safe-area-inset-left));
  justify-items: start;
}

.footer-control-right {
  right: max(1rem, env(safe-area-inset-right));
  justify-items: end;
}

body.focus-active .footer-control {
  opacity: 0;
  transform: translateY(10px);
  filter: blur(8px);
  pointer-events: none;
}

.theme-footnote-main,
.picker-pair {
  display: grid;
  gap: 0.45rem;
}

.footnote-label {
  font-size: 0.76rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

.footnote-select {
  min-width: 160px;
  width: auto;
  padding: 0.45rem 0.7rem;
  border-radius: 999px;
  font-size: 0.9rem;
  background: transparent;
  border-color: transparent;
  color: var(--muted);
  text-align: inherit;
}

.footer-control-left .footnote-select {
  text-align: left;
}

.footer-control-right .footnote-select {
  text-align: right;
}

.footnote-select:hover,
.footnote-select:focus {
  color: var(--text);
  border-color: var(--border);
  background: color-mix(in srgb, var(--bg) 74%, transparent);
}

.custom-theme-row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 132px));
  gap: 0.65rem;
}

.color-input {
  width: 100%;
  min-height: 42px;
  padding: 0.16rem;
  border-radius: 14px;
  background: transparent;
}

.reader-view {
  position: fixed;
  inset: 0;
  min-height: 100dvh;
  display: grid;
  place-items: center;
  opacity: 0;
  transform: scale(0.96);
  pointer-events: none;
  transition: opacity var(--transition), transform var(--transition);
}

body.focus-active .reader-view {
  opacity: 1;
  transform: scale(1);
  pointer-events: auto;
}

.reader-stage {
  width: 100%;
  min-height: 100dvh;
  padding:
    max(1.25rem, env(safe-area-inset-top))
    max(1rem, env(safe-area-inset-right))
    calc(1.25rem + env(safe-area-inset-bottom))
    max(1rem, env(safe-area-inset-left));
  display: grid;
  gap: 1.25rem;
  place-items: center;
}

.reader-frame {
  display: flex;
  align-items: center;
  justify-content: center;
  width: var(--anchor-track);
  min-height: calc(var(--reader-size) * 1.85);
  font-size: var(--reader-size);
  line-height: 1;
  letter-spacing: 0;
  font-weight: 800;
  font-family: ui-monospace, "SFMono-Regular", "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
  user-select: none;
  touch-action: manipulation;
}

.word-chunk {
  white-space: pre;
  overflow: visible;
}

.word-chunk.left {
  width: calc(var(--anchor-track) / 2 - 0.5ch);
  text-align: right;
  padding-right: 0.02ch;
}

.word-chunk.right {
  width: calc(var(--anchor-track) / 2 - 0.5ch);
  text-align: left;
  padding-left: 0.02ch;
}

.anchor-shell {
  position: relative;
  width: 1ch;
  min-width: 1ch;
  display: inline-flex;
  justify-content: center;
  align-items: center;
}

.word-chunk.anchor {
  color: var(--accent);
}

.anchor-marker::before,
.anchor-marker::after {
  content: "";
  position: absolute;
  left: -0.2ch;
  width: 1.4ch;
  height: 2px;
  border-radius: 999px;
  background: var(--accent);
}

.anchor-marker::before {
  top: -0.46em;
}

.anchor-marker::after {
  bottom: -0.46em;
}

.reader-status {
  min-height: 1.4rem;
  color: var(--muted);
  text-align: center;
  font-size: 0.98rem;
  touch-action: manipulation;
}

.reader-controls {
  display: none;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  width: 100%;
  padding-bottom: max(0.25rem, env(safe-area-inset-bottom));
}

.reader-control-button {
  min-width: 120px;
  padding: 0.9rem 1.1rem;
}

.reader-control-button-secondary {
  background: transparent;
  color: var(--text);
}

@media (max-width: 900px) {
  .app-shell {
    padding:
      max(1.2rem, env(safe-area-inset-top))
      max(1rem, env(safe-area-inset-right))
      calc(6rem + env(safe-area-inset-bottom))
      max(1rem, env(safe-area-inset-left));
    align-items: start;
  }

  .app-panel {
    padding: 1.2rem;
  }

  .grid {
    grid-template-columns: 1fr;
  }

  .textarea {
    min-height: 260px;
  }

  .reader-stage {
    padding:
      max(1rem, env(safe-area-inset-top))
      max(0.8rem, env(safe-area-inset-right))
      calc(1rem + env(safe-area-inset-bottom))
      max(0.8rem, env(safe-area-inset-left));
  }

  .reader-frame {
    width: min(96vw, 30ch);
  }
}

@media (max-width: 640px) {
  .stats-block,
  .custom-theme-row {
    grid-template-columns: 1fr;
  }

  .footer-control {
    bottom: calc(0.7rem + env(safe-area-inset-bottom));
    max-width: calc(50vw - 1rem);
  }

  .footer-control-left {
    left: max(0.7rem, env(safe-area-inset-left));
  }

  .footer-control-right {
    right: max(0.7rem, env(safe-area-inset-right));
  }

  .footnote-select {
    min-width: 0;
    width: 100%;
    max-width: 100%;
    font-size: 0.84rem;
  }

  .custom-theme-row {
    grid-template-columns: 1fr;
    width: min(170px, 42vw);
  }

  .reader-frame {
    font-size: clamp(2rem, 11vw, 4rem);
    width: min(98vw, 18ch);
    min-height: calc(var(--reader-size) * 1.45);
  }

  .reader-status {
    font-size: 0.9rem;
    padding-inline: 0.75rem;
  }

  .textarea,
  .input,
  .footnote-select,
  .button {
    font-size: 16px;
  }

  .reader-controls {
    display: flex;
    flex-wrap: wrap;
  }
}

@media (hover: none), (pointer: coarse) {
  .reader-controls {
    display: flex;
  }
}