:root {
  --primary: #000000;
  --primary-container: #1c1b1b;
  --on-surface: #0b1c30;
  --on-surface-variant: #444748;
  --surface: #f8f9ff;
  --surface-low: #eff4ff;
  --surface-high: #dce9ff;
  --surface-highest: #d3e4fe;
  --surface-lowest: #ffffff;
  --surface-dim: #cbdbf5;
  --success: #006d35;
  --success-container: #8df9a8;
  --warning: #ffb77d;
  --ghost: rgba(196, 199, 199, 0.2);
  --shadow: 0 8px 32px rgba(11, 28, 48, 0.06);
  --font-display: "Manrope", "Inter", system-ui, sans-serif;
  --font-body: "Inter", system-ui, sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  background: var(--surface);
  color: var(--on-surface);
  font-family: var(--font-body);
  line-height: 1.45;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 320px;
}

button,
a {
  font: inherit;
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  border: 0;
  cursor: pointer;
}

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

.site-shell {
  min-height: 100vh;
}

.masthead {
  background: var(--surface);
  padding: 40px 20px 24px;
}

.masthead-inner {
  align-items: start;
  display: grid;
  gap: 24px;
  grid-template-columns: minmax(0, 1fr) auto;
  margin: 0 auto;
  max-width: 1400px;
}

.masthead-copy {
  max-width: 860px;
}

.eyebrow,
.kicker,
.meta-label,
.version-year,
.closed-label,
.url-line,
.format-pill {
  color: var(--on-surface-variant);
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0;
  margin: 0;
  text-transform: uppercase;
}

h1 {
  color: var(--primary);
  font-family: var(--font-display);
  font-size: 3.5rem;
  line-height: 0.98;
  margin: 8px 0 0;
  max-width: 820px;
}

.intro {
  color: var(--on-surface-variant);
  font-size: 1rem;
  margin: 18px 0 0;
  max-width: 680px;
}

.language-switch {
  align-items: center;
  background: var(--surface-low);
  display: inline-grid;
  gap: 4px;
  grid-template-columns: repeat(2, minmax(48px, 1fr));
  min-height: 44px;
  padding: 4px;
}

.lang-button,
.nav-button,
.action-button,
.source-link {
  align-items: center;
  display: inline-flex;
  justify-content: center;
  min-height: 40px;
  padding: 0 14px;
  transition:
    background-color 160ms ease,
    color 160ms ease,
    transform 160ms ease;
}

.lang-button {
  background: transparent;
  color: var(--on-surface-variant);
  font-size: 0.75rem;
  font-weight: 800;
}

.lang-button.is-active {
  background: linear-gradient(135deg, var(--primary), var(--primary-container));
  color: var(--surface-lowest);
}

.comparison-nav {
  background: var(--surface-low);
  display: flex;
  gap: 8px;
  margin: 0;
  overflow-x: auto;
  padding: 12px 20px;
  scrollbar-width: thin;
}

.comparison-nav-inner {
  display: flex;
  gap: 8px;
  margin: 0 auto;
  max-width: 1400px;
  min-width: min-content;
  width: 100%;
}

.nav-button {
  background: transparent;
  color: var(--on-surface);
  flex: 0 0 auto;
  font-weight: 800;
  min-width: 172px;
}

.nav-button:hover,
.nav-button:focus-visible {
  background: var(--surface-high);
}

.nav-button.is-active {
  background: var(--primary);
  color: var(--surface-lowest);
}

.ledger {
  background: var(--surface);
}

.summary-band,
.viewer-band {
  padding: 28px 20px;
}

.summary-band {
  background: var(--surface-lowest);
}

.summary-inner,
.viewer-inner {
  margin: 0 auto;
  max-width: 1400px;
}

.viewer-inner {
  max-width: 1760px;
}

.summary-inner {
  display: grid;
  gap: 24px;
  grid-template-columns: minmax(0, 1fr) auto;
}

.prompt-title {
  font-family: var(--font-display);
  font-size: 2rem;
  line-height: 1.08;
  margin: 6px 0 0;
}

.prompt-text {
  background: var(--surface-low);
  color: var(--primary);
  display: inline-flex;
  font-size: 1rem;
  font-weight: 800;
  margin: 16px 0 0;
  max-width: 100%;
  padding: 8px 10px;
  word-break: break-word;
}

.meta-grid {
  align-content: start;
  display: grid;
  gap: 8px;
  grid-template-columns: repeat(2, minmax(132px, 1fr));
  min-width: 300px;
}

.metric-block {
  background: var(--surface-low);
  padding: 14px;
}

.metric-value {
  color: var(--primary);
  display: block;
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 800;
  line-height: 1;
  margin-top: 6px;
}

.control-row {
  align-items: center;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: space-between;
  margin-bottom: 16px;
}

.layout-controls {
  align-items: center;
  background: var(--surface-low);
  display: inline-flex;
  flex-wrap: wrap;
  gap: 4px;
  padding: 4px;
}

.layout-label {
  color: var(--on-surface-variant);
  font-size: 0.75rem;
  font-weight: 800;
  padding: 0 8px;
  text-transform: uppercase;
}

.layout-button {
  align-items: center;
  background: transparent;
  color: var(--on-surface);
  display: inline-flex;
  font-size: 0.75rem;
  font-weight: 800;
  justify-content: center;
  min-height: 36px;
  min-width: 108px;
  padding: 0 12px;
}

.layout-button:hover,
.layout-button:focus-visible {
  background: var(--surface-high);
}

.layout-button.is-active {
  background: linear-gradient(135deg, var(--primary), var(--primary-container));
  color: var(--surface-lowest);
}

.format-pill {
  background: var(--surface-high);
  color: var(--on-surface);
  display: inline-flex;
  padding: 8px 10px;
}

.action-button,
.source-link {
  background: var(--surface-high);
  color: var(--on-surface);
  font-size: 0.8125rem;
  font-weight: 800;
  min-width: 96px;
}

.action-button.primary {
  background: linear-gradient(135deg, var(--primary), var(--primary-container));
  color: var(--surface-lowest);
}

.action-button:hover,
.source-link:hover,
.action-button:focus-visible,
.source-link:focus-visible {
  transform: translateY(-1px);
}

.comparison-grid {
  display: grid;
  gap: 18px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.comparison-grid.layout-stack,
.comparison-grid.layout-focus-2025,
.comparison-grid.layout-focus-2026 {
  grid-template-columns: 1fr;
}

.comparison-grid.layout-focus-2025 .comparison-panel:nth-child(2),
.comparison-grid.layout-focus-2026 .comparison-panel:nth-child(1) {
  display: none;
}

.comparison-panel {
  background: var(--surface-lowest);
  box-shadow: var(--shadow);
  display: grid;
  gap: 16px;
  padding: 16px;
}

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

.version-year {
  color: var(--success);
}

.model-chip {
  background: var(--surface-low);
  color: var(--primary);
  flex: 0 0 auto;
  font-size: 0.75rem;
  font-weight: 800;
  padding: 7px 9px;
  text-transform: uppercase;
}

.frame-shell {
  background: var(--surface-dim);
  display: grid;
  height: clamp(560px, 72vh, 920px);
  min-height: 560px;
  overflow: hidden;
  place-items: stretch;
  position: relative;
  width: 100%;
}

.comparison-grid.layout-stack .frame-shell {
  height: clamp(720px, 84vh, 1100px);
}

.comparison-grid.layout-focus-2025 .frame-shell,
.comparison-grid.layout-focus-2026 .frame-shell {
  height: clamp(760px, 88vh, 1180px);
}

.closed-state {
  align-content: center;
  display: grid;
  gap: 14px;
  justify-items: start;
  min-height: inherit;
  padding: 24px;
}

.closed-label {
  color: var(--primary);
}

.closed-copy {
  color: var(--on-surface-variant);
  margin: 0;
  max-width: 360px;
}

.ghost-lines {
  display: grid;
  gap: 8px;
  width: min(100%, 320px);
}

.ghost-lines span {
  background: rgba(11, 28, 48, 0.14);
  display: block;
  height: 10px;
}

.ghost-lines span:nth-child(2) {
  width: 76%;
}

.ghost-lines span:nth-child(3) {
  width: 48%;
}

.result-frame {
  background: var(--primary);
  display: block;
  height: 100%;
  width: 100%;
}

.tool-row {
  align-items: center;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.url-line {
  color: var(--on-surface-variant);
  margin: 0;
  overflow-wrap: anywhere;
  text-transform: none;
}

.same-origin-note {
  background: var(--surface-low);
  color: var(--on-surface-variant);
  margin-top: 20px;
  padding: 14px;
}

*:focus-visible {
  outline: 3px solid var(--warning);
  outline-offset: 3px;
}

@media (max-width: 980px) {
  .comparison-grid {
    grid-template-columns: 1fr;
  }

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

  .meta-grid {
    min-width: 0;
  }
}

@media (max-width: 720px) {
  .masthead {
    padding-top: 28px;
  }

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

  h1 {
    font-size: 2.35rem;
  }

  .prompt-title {
    font-size: 1.55rem;
  }

  .language-switch {
    width: 100%;
  }

  .panel-head,
  .control-row {
    align-items: stretch;
    flex-direction: column;
  }

  .layout-controls {
    width: 100%;
  }

  .layout-label,
  .layout-button {
    width: 100%;
  }

  .model-chip,
  .action-button,
  .source-link {
    width: 100%;
  }

  .frame-shell {
    height: clamp(520px, 70vh, 780px);
    min-height: 520px;
  }

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