:root {
  --font-size: clamp(2.5rem, 8vw, 7rem);
  --icon-button-size: 56px;
  --reader-center-shift: -3ch;
  --pivot-marker-gap-top: 0.08em;
  --flash-duration: 240ms;
}

:root[data-theme="day"] {
  color-scheme: light;
  --bg: #ffffff;
  --fg: #0c0c0c;
  --muted: #5b5b5b;
  --accent: #df3b30;
  --guide: #cecece;
  --guide: color-mix(in srgb, var(--bg) 90%, var(--fg) 10%);
  --line: #d9d9d9;
  --panel-bg: rgba(255, 255, 255, 0.96);
  --panel-overlay: rgba(255, 255, 255, 0.68);
  --panel-border: rgba(0, 0, 0, 0.08);
  --surface-start: #ffffff;
  --surface-end: #f7f7f7;
  --control-bg: rgba(12, 12, 12, 0.03);
  --shadow: 0 24px 50px rgba(0, 0, 0, 0.12);
}

:root[data-theme="night"] {
  color-scheme: dark;
  --bg: #0c0c0c;
  --fg: #ffffff;
  --muted: #b8b8b8;
  --accent: #df3b30;
  --guide: #3d3d3d;
  --guide: color-mix(in srgb, var(--bg) 90%, var(--fg) 10%);
  --line: #383838;
  --panel-bg: rgba(12, 12, 12, 0.96);
  --panel-overlay: rgba(0, 0, 0, 0.7);
  --panel-border: rgba(255, 255, 255, 0.14);
  --surface-start: #161616;
  --surface-end: #101010;
  --control-bg: rgba(255, 255, 255, 0.06);
  --shadow: 0 24px 50px rgba(0, 0, 0, 0.48);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
  background: var(--bg);
  color: var(--fg);
  font-family: "Segoe UI", sans-serif;
}

body {
  min-height: 100vh;
}

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

.hidden {
  display: none !important;
}

.app {
  min-height: 100vh;
}

.setup-screen,
.reader-screen {
  min-height: 100vh;
}

.setup-screen {
  display: grid;
  place-items: center;
  padding: 24px;
}

.setup-card {
  width: min(100%, 560px);
  padding: 32px;
  border: 1px solid var(--line);
  border-radius: 24px;
  box-shadow: var(--shadow);
  background: linear-gradient(180deg, var(--surface-start) 0%, var(--surface-end) 100%);
}

.helper-text {
  margin: 0;
  color: var(--muted);
}

.file-picker {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: center;
  gap: 16px;
  padding: 18px;
  border: 2px dashed var(--line);
  border-radius: 18px;
  cursor: pointer;
  text-align: left;
  background: var(--control-bg);
}

.file-picker input {
  display: block;
  width: 1px;
  height: 1px;
  opacity: 0;
  pointer-events: none;
}

.file-picker-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 72px;
  height: 72px;
  border-radius: 18px;
  border: 1px solid var(--line);
  background: var(--bg);
}

.file-picker-icon .icon {
  width: 28px;
  height: 28px;
}

.file-picker-formats {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  min-width: 0;
}

.file-picker-format {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 32px;
  padding: 6px 10px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--bg);
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.06em;
}

.selected-file {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-height: 52px;
  margin: 16px 0 0;
  padding: 10px 14px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--control-bg);
  color: var(--muted);
  max-width: 100%;
}

.selected-file[data-has-file="false"] .selected-file-name {
  display: none;
}

.selected-file[data-has-file="true"] {
  color: var(--fg);
}

.selected-file-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
}

.selected-file-name {
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.setup-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
  align-items: center;
}

.saved-documents {
  margin-top: 18px;
}

.saved-documents-list {
  display: grid;
  gap: 10px;
}

.saved-document-button {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  width: 100%;
  min-height: 54px;
  padding: 12px 16px;
  text-align: left;
}

.saved-document-name {
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.saved-document-progress {
  flex: 0 0 auto;
  color: var(--muted);
  font-size: 0.9rem;
  font-variant-numeric: tabular-nums;
}

.preset-stories {
  display: grid;
  gap: 12px;
  margin-top: 20px;
}

.feedback-email {
  display: block;
  width: fit-content;
  max-width: 100%;
  margin: 20px auto 0;
  color: var(--muted);
  text-decoration: none;
  font-size: 0.95rem;
  line-height: 1.4;
  text-align: center;
  overflow-wrap: anywhere;
  transition: color 0.16s ease, opacity 0.16s ease;
}

.feedback-email:hover,
.feedback-email:focus-visible {
  color: var(--fg);
}

.preset-story-button {
  width: 100%;
  min-height: 56px;
  padding: 14px 18px;
  text-align: center;
  white-space: normal;
  line-height: 1.3;
}

.primary-button,
.secondary-button {
  border-radius: 999px;
  padding: 12px 20px;
  border: 1px solid var(--fg);
  cursor: pointer;
  transition: background-color 0.16s ease, color 0.16s ease, border-color 0.16s ease, opacity 0.16s ease;
}

.primary-button {
  background: var(--fg);
  color: var(--bg);
}

.primary-button:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.secondary-button {
  background: var(--bg);
  color: var(--fg);
}

.setup-button {
  width: 72px;
  min-width: 72px;
  height: 72px;
}

.reader-screen {
  position: relative;
  overflow: hidden;
}

.reader-stage {
  position: relative;
  z-index: 0;
  display: grid;
  place-items: center;
  min-height: 100vh;
  padding: 24px;
  background: var(--bg);
  touch-action: none;
  user-select: none;
}

.word-display {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
  align-items: center;
  width: min(100%, 1200px);
  min-height: 1.2em;
  font-family: "Cascadia Mono", "Consolas", monospace;
  font-size: var(--font-size);
  line-height: 1;
  letter-spacing: 0;
  transform: translateX(var(--reader-center-shift)) scale(var(--word-fit-scale, 1));
  transform-origin: center center;
}

.word-display.flash-active .word-left,
.word-display.flash-active .word-pivot-text,
.word-display.flash-active .word-right {
  animation-name: word-flash;
  animation-duration: var(--flash-duration);
  animation-timing-function: linear;
  animation-fill-mode: both;
}

.word-display.triggered-sentence-fade-active .word-left,
.word-display.triggered-sentence-fade-active .word-pivot-text,
.word-display.triggered-sentence-fade-active .word-right {
  animation-name: triggered-sentence-fade;
  animation-duration: var(--triggered-sentence-fade-duration);
  animation-delay: var(--triggered-sentence-fade-delay);
  animation-timing-function: linear;
  animation-fill-mode: both;
}

.word-left {
  justify-self: end;
  min-width: 0;
  color: var(--fg);
  white-space: pre;
}

.word-pivot {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
  white-space: pre;
}

.word-pivot::before {
  content: "";
  position: absolute;
  left: 50%;
  bottom: calc(100% + var(--pivot-marker-gap-top));
  width: 0.18em;
  height: 0.14em;
  background: currentColor;
  clip-path: polygon(50% 100%, 0 0, 100% 0);
  transform: translateX(-50%);
  z-index: 1;
  pointer-events: none;
}

.word-pivot::after {
  content: "";
  position: absolute;
  left: 50%;
  top: calc(-0.24em - 2px);
  bottom: -0.08em;
  width: 1px;
  background: var(--guide);
  transform: translateX(-50%);
  z-index: -1;
  pointer-events: none;
}

.word-pivot-text {
  position: relative;
  display: inline-block;
  z-index: 1;
}

.word-left.has-gap {
  margin-right: 0.18em;
}

.word-right.has-gap {
  margin-left: 0.18em;
}

.word-right {
  justify-self: start;
  min-width: 0;
  color: var(--fg);
  white-space: pre;
}

.control-panel {
  position: absolute;
  inset: 0;
  z-index: 20;
  display: grid;
  place-items: center;
  padding: 24px;
  background: var(--panel-overlay);
  backdrop-filter: blur(8px);
}

.panel-card {
  width: min(100%, 680px);
  padding: 24px;
  border-radius: 24px;
  background: var(--panel-bg);
  box-shadow: var(--shadow);
  border: 1px solid var(--panel-border);
}

.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.panel-toggles {
  display: inline-flex;
  align-items: center;
  gap: 12px;
}

.panel-actions {
  display: inline-flex;
  align-items: center;
  gap: 12px;
}

.panel-section {
  margin-top: 20px;
}

.panel-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 10px;
}

.panel-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  border-radius: 14px;
  border: 1px solid var(--line);
  background: var(--control-bg);
  color: var(--muted);
}

.panel-value {
  font-size: 1.2rem;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.03em;
}

.panel-section input[type="range"] {
  width: 100%;
  accent-color: var(--fg);
}

.panel-card .primary-button,
.panel-card .secondary-button {
  border-color: var(--line);
}

.panel-card .secondary-button {
  background: var(--control-bg);
}

.panel-card .feedback-email {
  margin-top: 24px;
}

.flash-toggle {
  border-color: var(--line);
  background: var(--control-bg);
}

.flash-toggle[data-flash-mode="on"] {
  border-color: var(--fg);
  background: var(--fg);
  color: var(--bg);
}

.panel-link {
  display: block;
  width: fit-content;
  max-width: 100%;
  margin: 10px auto 0;
  color: var(--muted);
  opacity: 0.6;
  text-decoration: underline;
  text-underline-offset: 0.18em;
  font-size: 0.75rem;
  line-height: 1.4;
  text-align: center;
  overflow-wrap: anywhere;
  transition: color 0.16s ease, opacity 0.16s ease;
}

.panel-link:hover,
.panel-link:focus-visible {
  color: var(--fg);
  opacity: 1;
}

.icon-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: var(--icon-button-size);
  min-width: var(--icon-button-size);
  height: var(--icon-button-size);
  padding: 0;
}

.icon {
  width: 22px;
  height: 22px;
  stroke: currentColor;
  fill: none;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
  flex: 0 0 auto;
  pointer-events: none;
}

.status-indicator {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  margin-top: 18px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--control-bg);
  color: transparent;
  font-size: 0;
}

.status-indicator::before,
.status-indicator::after {
  content: "";
  position: absolute;
}

.status-indicator[data-state="loading"]::before {
  width: 18px;
  height: 18px;
  border: 2px solid var(--muted);
  border-top-color: var(--fg);
  border-radius: 50%;
  animation: status-spin 0.8s linear infinite;
}

.status-indicator[data-state="ready"]::before,
.status-indicator[data-state="done"]::before {
  width: 14px;
  height: 8px;
  border-left: 2px solid var(--fg);
  border-bottom: 2px solid var(--fg);
  transform: translateY(-1px) rotate(-45deg);
}

.status-indicator[data-state="error"]::before {
  width: 0;
  height: 0;
  border-left: 10px solid transparent;
  border-right: 10px solid transparent;
  border-bottom: 18px solid var(--accent);
  top: 9px;
}

.status-indicator[data-state="error"]::after {
  width: 2px;
  height: 7px;
  background: var(--bg);
  top: 18px;
}

.status-indicator[data-state="error"] {
  box-shadow: inset 0 0 0 1px rgba(201, 29, 29, 0.18);
}

@keyframes status-spin {
  to {
    transform: rotate(360deg);
  }
}

@keyframes word-flash {
  0% {
    opacity: 0.18;
  }

  12% {
    opacity: 1;
  }

  76% {
    opacity: 1;
  }

  100% {
    opacity: 0.16;
  }
}

@keyframes triggered-sentence-fade {
  0% {
    opacity: 1;
  }

  100% {
    opacity: 0;
  }
}

.theme-toggle {
  position: relative;
  display: inline-flex;
  align-items: center;
  width: 118px;
  height: var(--icon-button-size);
  padding: 0;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--control-bg);
  color: var(--fg);
  cursor: pointer;
}

.theme-toggle::after {
  content: "";
  position: absolute;
  top: 5px;
  left: 5px;
  width: calc(50% - 7px);
  height: calc(100% - 10px);
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--bg);
  box-shadow: 0 8px 18px rgba(0, 0, 0, 0.08);
  transform: translateX(0);
  transition: transform 0.18s ease;
}

.theme-toggle[data-theme-mode="night"]::after {
  transform: translateX(calc(100% + 4px));
}

.theme-toggle-icons {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  width: 100%;
  align-items: center;
}

.theme-toggle .icon {
  justify-self: center;
  width: 20px;
  height: 20px;
  opacity: 0.45;
  transition: opacity 0.18s ease;
}

.theme-toggle[data-theme-mode="day"] .icon:first-child,
.theme-toggle[data-theme-mode="night"] .icon:last-child {
  opacity: 1;
}

.setup-welcome {
  text-align: center;
  margin-bottom: 24px;
}

.setup-welcome h1 {
  margin: 0;
  font-size: clamp(1.6rem, 4vw, 2.2rem);
  letter-spacing: -0.01em;
  line-height: 1.15;
}

.setup-welcome p {
  margin: 8px auto 0;
  max-width: 40ch;
  color: var(--muted);
  font-size: 0.95rem;
  line-height: 1.5;
}

.setup-section-tabs {
  display: flex;
  gap: 0;
  margin-top: 18px;
  margin-bottom: 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 3px;
  width: fit-content;
}

.setup-tab {
  border: none;
  background: transparent;
  padding: 7px 16px;
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  color: var(--muted);
  transition: background 0.16s ease, color 0.16s ease;
}

.setup-tab:focus-visible {
  outline: 2px solid var(--fg);
  outline-offset: 2px;
}

.setup-tab.active {
  background: var(--fg);
  color: var(--bg);
}

.saved-documents-wrapper .saved-documents {
  margin-top: 0;
}

.setup-paste-hint {
  margin: 10px 0 0;
  text-align: center;
  color: var(--muted);
  font-size: 0.82rem;
}

.setup-card {
  position: relative;
}

.setup-card.drag-over {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(223, 59, 48, 0.12);
}

.setup-card.drag-over::after {
  content: "Отпустите файл для загрузки";
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  background: var(--panel-overlay);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  border-radius: inherit;
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--fg);
  z-index: 10;
  pointer-events: none;
}

.stats-panel {
  margin-top: 0;
}

.stats-today {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--control-bg);
  margin-bottom: 14px;
}

.stats-today-label {
  font-weight: 700;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
}

.stats-today-value {
  font-size: 1.3rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.stats-today-time {
  margin-left: auto;
  color: var(--muted);
  font-size: 0.9rem;
  font-variant-numeric: tabular-nums;
}

.stats-streak {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 14px;
}

.stats-streak-icon {
  font-size: 1.1rem;
}

.stats-streak-value {
  font-variant-numeric: tabular-nums;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin-bottom: 16px;
}

.stat-card {
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--bg);
}

.stat-label {
  display: block;
  font-size: 0.75rem;
  color: var(--muted);
  margin-bottom: 4px;
}

.stat-value {
  font-size: 1.15rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.stats-week {
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 14px 12px 10px;
  background: var(--control-bg);
}

.stats-week-chart {
  display: flex;
  align-items: flex-end;
  gap: 5px;
  height: 64px;
}

.stats-bar {
  flex: 1;
  min-width: 0;
  border-radius: 4px 4px 0 0;
  background: var(--fg);
  opacity: 0.12;
  transition: height 0.2s ease, opacity 0.16s ease;
}

.stats-bar.filled {
  opacity: 0.6;
}

.stats-bar.today {
  opacity: 1;
}

.stats-week-labels {
  display: flex;
  gap: 5px;
  margin-top: 6px;
}

.stats-bar-label {
  flex: 1;
  min-width: 0;
  font-size: 0.62rem;
  color: var(--muted);
  text-align: center;
  white-space: nowrap;
  overflow: hidden;
}

.onboarding-overlay {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: grid;
  place-items: center;
  padding: 24px;
  background: var(--panel-overlay);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.onboarding-card {
  width: min(100%, 460px);
  padding: 28px;
  border-radius: 24px;
  background: var(--panel-bg);
  box-shadow: var(--shadow);
  border: 1px solid var(--panel-border);
}

.onboarding-steps {
  position: relative;
  min-height: 140px;
}

.onboarding-step {
  display: none;
}

.onboarding-step.active {
  display: block;
}

.onboarding-step-icon {
  width: 52px;
  height: 52px;
  border-radius: 16px;
  border: 1px solid var(--line);
  background: var(--control-bg);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 14px;
}

.onboarding-step h2 {
  margin: 0 0 8px;
  font-size: 1.2rem;
}

.onboarding-step p {
  margin: 0;
  color: var(--muted);
  line-height: 1.55;
}

.onboarding-dots {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-top: 20px;
}

.onboarding-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  border: none;
  background: var(--line);
  padding: 0;
  cursor: pointer;
  transition: background 0.16s ease, transform 0.16s ease;
}

.onboarding-dot:focus-visible {
  outline: 2px solid var(--fg);
  outline-offset: 2px;
}

.onboarding-dot.active {
  background: var(--fg);
  transform: scale(1.2);
}

.onboarding-actions {
  display: flex;
  justify-content: flex-end;
  gap: 12px;
  margin-top: 20px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
}

@media (max-width: 640px) {
  .setup-card,
  .panel-card {
    padding: 20px;
    border-radius: 20px;
  }

  .file-picker {
    gap: 14px;
  }

  .file-picker-icon {
    width: 64px;
    height: 64px;
  }

  .file-picker-format {
    min-height: 30px;
    padding: 5px 9px;
    font-size: 0.76rem;
  }

  .saved-document-button {
    padding: 11px 14px;
  }

  .saved-document-progress {
    font-size: 0.84rem;
  }

  .panel-header {
    gap: 12px;
  }

  .stats-today {
    flex-wrap: wrap;
    gap: 8px;
  }

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

  .onboarding-card {
    padding: 22px;
  }
}

/* Optional menu-only display ad. Disabled configuration reserves no space. */
.setup-ad {
  width: 100%;
  margin-top: 24px;
  min-width: 0;
}

.setup-ad[hidden] {
  display: none;
}

.setup-ad-label {
  display: block;
  margin-bottom: 6px;
  color: var(--muted);
  font-size: 0.72rem;
}

.setup-ad-content {
  width: 100%;
  min-height: 50px;
}