:root {
  --page: #292c2e;
  --surface: #222527;
  --surface-soft: #333739;
  --ink: #f3f5f2;
  --ink-soft: #c5cac6;
  --ink-muted: #929a95;
  --line: #454a47;
  --line-strong: #626965;
  --green: #2abd55;
  --green-dark: #68df88;
  --green-soft: #203d2a;
  --danger: #ff8176;
  --success: #68df88;
  --radius-sm: 4px;
  --radius-md: 7px;
  --transition-fast: 140ms ease;
}

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

html {
  color-scheme: dark;
}

body {
  min-height: 100vh;
  padding-bottom: 28px;
  background: var(--page);
  color: var(--ink);
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  font-size: 15px;
  line-height: 1.5;
}

button,
input,
select {
  font: inherit;
}

button:focus-visible,
input:focus-visible,
select:focus-visible,
summary:focus-visible {
  outline: 3px solid rgba(7, 149, 47, 0.24);
  outline-offset: 2px;
}

[hidden] {
  display: none !important;
}

.app-header {
  background: #202325;
  border-bottom: 1px solid var(--line);
}

.header-inner,
.app-container,
.footer-inner {
  width: min(100% - 40px, 1080px);
  margin-inline: auto;
}

.header-inner {
  min-height: 76px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  min-width: 0;
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: inherit;
  text-decoration: none;
}

.brand img {
  width: 52px;
  height: 52px;
  flex: 0 0 auto;
  object-fit: contain;
}

.brand-copy {
  min-width: 0;
  display: grid;
  line-height: 1.15;
}

.brand-copy strong {
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.emhx-help-button {
  width: 19px;
  height: 19px;
  display: inline-grid;
  place-items: center;
  padding: 0;
  border: 1px solid var(--line-strong);
  border-radius: 50%;
  background: transparent;
  color: var(--ink-muted);
  cursor: pointer;
  font-size: 0.68rem;
  font-weight: 700;
  line-height: 1;
}

.emhx-help-button:hover {
  border-color: var(--ink-soft);
  color: var(--ink);
}

.brand-copy small {
  margin-top: 4px;
  color: var(--ink-muted);
  font-size: 0.72rem;
}

.header-tools {
  display: flex;
  align-items: center;
  gap: 20px;
}

.local-note {
  color: var(--ink-muted);
  font-size: 0.72rem;
}

.lang-switcher {
  display: flex;
  gap: 4px;
  padding-left: 16px;
  border-left: 1px solid var(--line);
}

.lang-btn {
  min-width: 34px;
  padding: 5px;
  border: 0;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--ink-muted);
  cursor: pointer;
  font-size: 0.72rem;
  font-weight: 600;
}

.lang-btn:hover {
  background: var(--surface-soft);
  color: var(--ink);
}

.emhx-help-dialog {
  width: min(100% - 32px, 680px);
  max-height: min(82vh, 720px);
  margin: auto;
  padding: 0;
  overflow: auto;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-md);
  background: var(--surface);
  color: var(--ink);
}

.emhx-help-dialog::backdrop {
  background: rgba(0, 0, 0, 0.68);
}

.help-dialog-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 24px;
  padding: 24px 26px 18px;
  border-bottom: 1px solid var(--line);
}

.help-dialog-kicker {
  display: block;
  margin-bottom: 4px;
  color: var(--green-dark);
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.66rem;
  font-weight: 600;
  letter-spacing: 0.12em;
}

.help-dialog-header h2 {
  font-size: 1.35rem;
  letter-spacing: -0.03em;
}

.help-dialog-close {
  width: 30px;
  height: 30px;
  flex: 0 0 auto;
  padding: 0;
  border: 0;
  background: transparent;
  color: var(--ink-muted);
  cursor: pointer;
  font-size: 1.35rem;
  line-height: 1;
}

.help-dialog-close:hover {
  color: var(--ink);
}

.help-dialog-intro,
.help-dialog-flow {
  margin-inline: 26px;
  color: var(--ink-soft);
}

.help-dialog-intro {
  margin-top: 20px;
}

.help-dialog-flow {
  margin-top: 10px;
  font-weight: 600;
}

.help-difficulty-list {
  margin: 18px 26px 26px;
  border-top: 1px solid var(--line);
}

.help-difficulty-list > div {
  display: grid;
  grid-template-columns: 112px 1fr;
  gap: 18px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
}

.help-difficulty-list dt {
  color: var(--ink);
  font-weight: 650;
}

.help-difficulty-list dt span {
  width: 22px;
  display: inline-block;
  color: var(--green-dark);
  font-family: 'IBM Plex Mono', monospace;
}

.help-difficulty-list dd {
  color: var(--ink-muted);
  font-size: 0.82rem;
}

.lang-btn.active {
  background: var(--green-soft);
  color: var(--green-dark);
}

.hero-section {
  padding: 36px 0;
}

.hero-section h1 {
  margin-top: 0;
  font-size: clamp(2.25rem, 4.2vw, 3.4rem);
  font-weight: 700;
  letter-spacing: -0.055em;
  line-height: 1;
}

.hero-emhx {
  display: inline-flex;
  align-items: center;
  white-space: nowrap;
}

.hero-emhx .emhx-help-button {
  margin-left: 8px;
  transform: translateY(-0.08em);
}

.hero-section > p:not(.format-list) {
  margin-top: 18px;
  color: var(--ink-soft);
  font-size: 1.02rem;
}

.format-list {
  margin-top: 14px;
  color: var(--ink-muted);
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.68rem;
}

.page-section {
  padding: 30px 0;
  border-top: 1px solid var(--line);
}

.section-heading {
  display: grid;
  grid-template-columns: 30px minmax(0, 1fr);
  gap: 12px;
  align-items: start;
  margin-bottom: 18px;
}

.section-heading > span:first-child {
  width: 26px;
  height: 26px;
  display: grid;
  place-items: center;
  border: 1px solid var(--line-strong);
  border-radius: 50%;
  color: var(--ink-soft);
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.68rem;
}

.section-heading h2 {
  font-size: 1.1rem;
  font-weight: 650;
  letter-spacing: -0.02em;
}

.section-heading p {
  margin-top: 3px;
  color: var(--ink-muted);
  font-size: 0.8rem;
}

.section-heading-row {
  grid-template-columns: 30px minmax(0, 1fr) auto;
}

.dropzone-container {
  position: relative;
  min-height: 112px;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 16px;
  padding: 22px;
  border: 1px dashed var(--line-strong);
  border-radius: var(--radius-md);
  background: var(--surface);
  cursor: pointer;
  transition: border-color var(--transition-fast), background var(--transition-fast);
}

.dropzone-container.has-file {
  min-height: 152px;
  border-style: solid;
  border-color: var(--green);
}

.dropzone-container:hover,
.dropzone-container.drag-over {
  border-color: var(--green);
  background: var(--surface-soft);
}

.dropzone-icon {
  width: 48px;
  height: 48px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: var(--green-soft);
  color: var(--green-dark);
}

.dropzone-copy {
  min-width: 0;
  display: grid;
  gap: 3px;
}

.dropzone-copy strong {
  font-size: 0.9rem;
  font-weight: 600;
}

.dropzone-copy small {
  color: var(--ink-muted);
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.65rem;
}

.btn-primary,
.btn-secondary,
.btn-text,
.btn-icon {
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-weight: 600;
  transition: background var(--transition-fast), border-color var(--transition-fast), color var(--transition-fast);
}

.btn-primary,
.btn-secondary {
  min-height: 40px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 9px 15px;
  font-size: 0.78rem;
}

.btn-primary {
  border: 1px solid var(--green);
  background: var(--green);
  color: #07140b;
}

.btn-primary:hover {
  border-color: var(--green-dark);
  background: var(--green-dark);
}

.btn-primary:disabled {
  border-color: var(--line);
  background: var(--surface-soft);
  color: var(--ink-muted);
  cursor: not-allowed;
}

.btn-secondary {
  border: 1px solid var(--line-strong);
  background: var(--surface);
  color: var(--ink);
}

.btn-secondary:hover {
  border-color: var(--green);
  color: var(--green-dark);
}

.btn-text {
  min-height: 36px;
  padding: 7px 4px;
  border: 0;
  background: transparent;
  color: var(--ink-soft);
  font-size: 0.75rem;
}

.btn-text:hover:not(:disabled) {
  color: var(--danger);
}

.btn-text:disabled {
  color: var(--line-strong);
  cursor: not-allowed;
}

.file-counter,
.inspecting-title {
  align-self: center;
  max-width: 280px;
  overflow: hidden;
  color: var(--ink-muted);
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.64rem;
  text-overflow: ellipsis;
  text-transform: uppercase;
  white-space: nowrap;
}

.queue-list {
  min-height: 78px;
}

.queue-list:empty {
  min-height: 0;
}

.queue-item {
  min-height: 78px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 13px 0;
}

.queue-item-info {
  min-width: 0;
  flex: 1;
}

.queue-item-title {
  overflow: hidden;
  font-size: 0.88rem;
  font-weight: 600;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.queue-item-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 4px;
  color: var(--ink-muted);
  font-size: 0.7rem;
}

.status-badge {
  font-weight: 500;
}

.status-badge.processing { color: #8a6500; }
.status-badge.done { color: var(--success); }
.status-badge.error { color: var(--danger); }

.queue-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.queue-actions .btn-primary {
  min-height: 36px;
  padding-block: 7px;
}

.selected-file-overlay {
  position: absolute;
  inset: 0;
  z-index: 2;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(360px, 0.8fr);
  align-items: center;
  gap: 24px;
  padding: 20px 22px;
  background: var(--surface);
}

.selected-file-info {
  min-width: 0;
  display: flex;
  align-items: center;
  gap: 14px;
}

.selected-file-icon {
  width: 48px;
  height: 48px;
  display: grid;
  place-items: center;
  flex: 0 0 auto;
  border-radius: 50%;
  background: var(--green-soft);
  color: var(--green-dark);
}

.selected-file-info > div:last-child {
  min-width: 0;
  display: grid;
}

.selected-file-info small {
  color: var(--ink-muted);
  font-size: 0.68rem;
}

.selected-file-info strong {
  overflow: hidden;
  margin-top: 2px;
  font-size: 0.9rem;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.btn-link {
  width: max-content;
  margin-top: 5px;
  padding: 0;
  border: 0;
  background: transparent;
  color: var(--green-dark);
  cursor: pointer;
  font-size: 0.7rem;
}

.btn-link:hover {
  text-decoration: underline;
  text-underline-offset: 3px;
}

.selected-file-controls {
  width: min(100%, 320px);
  display: grid;
  justify-self: end;
  gap: 10px;
}

.btn-generate {
  width: 100%;
}

.btn-remove-file {
  min-height: 20px;
  justify-self: end;
  padding: 0;
}

.checkbox-label {
  display: flex;
  align-items: center;
  gap: 9px;
  margin-top: 0;
  color: var(--ink-soft);
  cursor: pointer;
  font-size: 0.76rem;
}

.checkbox-label input {
  width: 16px;
  height: 16px;
  accent-color: var(--green);
}

.conversion-progress {
  display: grid;
  gap: 6px;
  color: var(--ink-muted);
  font-size: 0.7rem;
}

.conversion-progress progress {
  width: 100%;
  height: 6px;
  border: 0;
  accent-color: var(--green);
}

.dropzone-container.is-processing .checkbox-label {
  display: none;
}

.inspector-panel.is-empty .visualizer-top-bar,
.inspector-panel.is-empty .highway-comparison,
.inspector-panel.is-empty .playback-controls,
.inspector-panel.is-empty .stats-row {
  display: none;
}

.visualizer-top-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 10px;
}

.diff-selector-tabs {
  display: flex;
  align-items: center;
  border-bottom: 1px solid var(--line);
}

.diff-tab {
  min-width: 72px;
  padding: 8px 10px;
  border: 0;
  border-bottom: 2px solid transparent;
  background: transparent;
  color: var(--ink-muted);
  cursor: pointer;
  font-size: 0.72rem;
}

.diff-tab:hover:not(:disabled) {
  color: var(--ink);
}

.diff-tab.active {
  border-bottom-color: var(--green);
  color: var(--green-dark);
  font-weight: 600;
}

.diff-tab:disabled,
.instrument-control select:disabled,
.btn-icon:disabled,
.timeline-slider:disabled {
  cursor: not-allowed;
}

.instrument-control {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--ink-muted);
  font-size: 0.7rem;
}

.instrument-control select {
  min-width: 140px;
  padding: 7px 28px 7px 9px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--surface);
  color: var(--ink);
  font-size: 0.72rem;
}

.highway-comparison {
  display: grid;
  gap: 12px;
}

.highway-track {
  min-width: 0;
}

.highway-track-heading {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 5px;
  color: var(--ink-muted);
  font-size: 0.64rem;
  text-transform: uppercase;
}

.highway-track-heading strong {
  color: var(--ink);
  font-size: 0.72rem;
  font-weight: 650;
  letter-spacing: 0.02em;
}

.canvas-wrapper {
  position: relative;
  width: 100%;
  height: 220px;
  overflow: hidden;
  border-radius: var(--radius-sm);
  background: #0b0e14;
}

.canvas-wrapper canvas {
  width: 100%;
  height: 100%;
  display: block;
}

.playback-controls {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 0;
}

.btn-icon {
  width: 32px;
  height: 32px;
  display: grid;
  place-items: center;
  flex: 0 0 auto;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--ink-soft);
}

.btn-icon:hover:not(:disabled) {
  border-color: var(--green);
  color: var(--green-dark);
}

.timeline-slider {
  flex: 1;
  height: 4px;
  appearance: none;
  border-radius: 0;
  background: var(--line-strong);
  cursor: pointer;
}

.timeline-slider::-webkit-slider-thumb {
  width: 12px;
  height: 16px;
  appearance: none;
  border: 0;
  border-radius: 2px;
  background: var(--green);
}

.timeline-slider::-moz-range-thumb {
  width: 12px;
  height: 16px;
  border: 0;
  border-radius: 2px;
  background: var(--green);
}

.time-display {
  min-width: 80px;
  color: var(--ink-muted);
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.65rem;
  text-align: right;
}

.stats-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  padding-top: 12px;
}

.stat-item {
  padding: 2px 16px;
  border-left: 1px solid var(--line);
}

.stat-item:first-child {
  padding-left: 0;
  border-left: 0;
}

.stat-item dt {
  color: var(--ink-muted);
  font-size: 0.64rem;
  text-transform: uppercase;
}

.stat-item dd {
  margin-top: 2px;
  font-size: 1rem;
  font-weight: 650;
}

.app-footer {
  position: fixed;
  z-index: 20;
  right: 0;
  bottom: 0;
  left: 0;
  border-top: 1px solid var(--line);
  background: var(--surface);
}

.footer-inner {
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--ink-muted);
  font-size: 0.68rem;
}

.footer-repository {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 2px 4px;
  color: var(--ink-muted);
  font-size: 0.68rem;
  font-weight: 600;
  line-height: 1;
  text-decoration: none;
}

.footer-repository svg {
  width: 14px;
  height: 14px;
}

.footer-repository:hover,
.footer-repository:focus-visible {
  color: var(--ink);
}

@media (max-width: 720px) {
  .header-inner,
  .app-container,
  .footer-inner {
    width: min(100% - 28px, 1080px);
  }

  .header-inner {
    min-height: 68px;
  }

  .brand img {
    width: 44px;
    height: 44px;
  }

  .brand-copy small,
  .local-note {
    display: none;
  }

  .header-tools {
    gap: 0;
  }

  .help-dialog-header {
    padding: 20px 20px 16px;
  }

  .help-dialog-intro,
  .help-dialog-flow {
    margin-inline: 20px;
  }

  .help-difficulty-list {
    margin-inline: 20px;
  }

  .help-difficulty-list > div {
    grid-template-columns: 1fr;
    gap: 5px;
  }

  .hero-section {
    padding: 28px 0 26px;
  }

  .hero-section h1 {
    font-size: clamp(2.15rem, 11vw, 3.1rem);
  }

  .dropzone-container.has-file {
    min-height: 210px;
  }

  .selected-file-overlay {
    grid-template-columns: minmax(0, 1fr);
    align-content: center;
    gap: 16px;
    padding: 18px;
  }

  .selected-file-controls {
    width: 100%;
    justify-self: stretch;
  }

  .btn-generate {
    width: 100%;
  }

  .page-section {
    padding: 25px 0;
  }

  .dropzone-container {
    grid-template-columns: auto minmax(0, 1fr);
    padding: 18px;
  }

  .dropzone-container .btn-primary {
    grid-column: 1 / -1;
  }

  .section-heading-row {
    grid-template-columns: 30px minmax(0, 1fr);
  }

  .file-counter,
  .inspecting-title {
    grid-column: 2;
    max-width: 100%;
    justify-self: start;
    margin-top: 4px;
  }

  .queue-item {
    align-items: flex-start;
    flex-direction: column;
  }

  .queue-actions {
    width: 100%;
  }

  .queue-actions .btn-primary {
    flex: 1;
  }

  .visualizer-top-bar {
    align-items: flex-start;
    flex-direction: column;
  }

  .diff-selector-tabs {
    width: 100%;
  }

  .diff-tab {
    min-width: 0;
    flex: 1;
    padding-inline: 5px;
  }

  .canvas-wrapper {
    height: 200px;
  }

  .stats-row {
    grid-template-columns: repeat(2, 1fr);
    row-gap: 12px;
  }

  .stat-item:nth-child(3) {
    padding-left: 0;
    border-left: 0;
  }

  .footer-inner {
    height: 28px;
  }
}