/* The annual design layer. Data rules stay in interactive/core.js.
 * Each visual role is a CSS variable calculated by style_math.js.
 * Year selectors add a few deliberate composition changes; local font stacks
 * approximate a direction without downloading historical brand assets.
 */
:root {
  --surface: #fffdf7;
  --accent: #e7b084;
  --heading-font: Georgia, serif;
  --heading-weight: 500;
  --heading-tracking: -0.055em;
  --heading-scale: 4.6rem;
  --panel-radius: 16px;
  --control-radius: 10px;
  --shadow-size: 10px;
  --panel-border: 1px;
  --ornament: 1;
  --selected: color-mix(in srgb, var(--series) 12%, var(--surface));
}
html {
  scroll-behavior: auto;
}
body {
  background: var(--paper);
}
main {
  max-width: 1280px;
  padding: 28px 40px 52px;
}
.masthead {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
  border-bottom: 1px solid var(--rule);
  padding-bottom: 20px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--ink);
  text-decoration: none;
  font-weight: 650;
  letter-spacing: -0.025em;
}
.brand small {
  display: block;
  color: var(--quiet);
  font-weight: 400;
  font-size: 0.75rem;
  letter-spacing: 0.015em;
  margin-top: 2px;
}
.brand-mark {
  display: grid;
  place-items: center;
  height: 44px;
  width: 44px;
  flex: 0 0 44px;
  background: var(--ink);
  color: var(--paper);
  border-radius: var(--control-radius);
  font:
    500 1.9rem/0.8 Georgia,
    serif;
  letter-spacing: -0.14em;
  padding-right: 6px;
}
.method-link {
  font-size: 0.8rem;
  color: var(--ink);
  text-align: right;
}
header.page-hero {
  max-width: none;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 240px;
  gap: 40px;
  align-items: center;
  padding: 54px 0 38px;
  position: relative;
  isolation: isolate;
}
.hero-copy {
  min-width: 0;
}
h1 {
  font-family: var(--heading-font);
  font-weight: var(--heading-weight);
  font-size: clamp(2rem, 5.4vw, var(--heading-scale));
  letter-spacing: var(--heading-tracking);
  line-height: 1.04;
  margin: 12px 0 22px;
}
h1 em {
  color: var(--series);
  font-style: normal;
}
[data-typography="editorial"] h1 em {
  font-style: italic;
}
.hero-description {
  font-size: 1.03rem;
  max-width: 650px;
  line-height: 1.55;
}
.eyebrow {
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.12em;
}
.era-signature {
  align-self: stretch;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 25px;
  border-left: 1px solid var(--rule);
  gap: 10px;
  position: relative;
}
.era-signature strong {
  font: var(--heading-weight) clamp(3.3rem, 7vw, 5.4rem) / 1 var(--heading-font);
  letter-spacing: -0.075em;
}
#design-name {
  font-size: 0.95rem;
  line-height: 1.35;
}
.evidence-kind {
  color: var(--quiet);
  font-size: 0.72rem;
}
.design-studio {
  background: var(--surface);
  border: var(--panel-border) solid var(--rule);
  border-radius: var(--panel-radius);
  padding: 24px;
  margin: 4px 0 30px;
}
.studio-heading {
  display: flex;
  justify-content: space-between;
  align-items: start;
  gap: 24px;
}
.studio-heading .eyebrow {
  margin-top: 0;
}
.studio-heading h2 {
  font-size: 1.25rem;
  letter-spacing: -0.035em;
  margin-bottom: 20px;
}
.studio-heading button {
  flex-shrink: 0;
}
.year-controller {
  display: grid;
  grid-template-columns: minmax(160px, 1fr) minmax(220px, 1.1fr) auto;
  gap: 24px;
  align-items: center;
}
.year-range-label {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 9px;
}
.year-range-label input,
.range-endpoints {
  grid-column: 1 / -1;
}
.year-range-label output {
  font-variant-numeric: tabular-nums;
  font-weight: 650;
}
.range-endpoints {
  display: flex;
  justify-content: space-between;
  color: var(--quiet);
  font-size: 0.72rem;
}
input[type="range"] {
  min-width: 0;
  width: 100%;
  margin: 0;
  accent-color: var(--series);
  min-height: 28px;
}
input[type="checkbox"] {
  accent-color: var(--series);
}
.year-preset-label select {
  width: 100%;
  min-width: 0;
}
.year-step-buttons {
  display: flex;
  gap: 8px;
}
.design-context {
  display: grid;
  grid-template-columns: minmax(180px, 0.8fr) minmax(0, 1.4fr);
  column-gap: 26px;
  margin: 20px 0 12px;
  border-top: 1px solid var(--rule);
  padding-top: 18px;
}
.design-context strong {
  font-weight: 650;
  font-size: 0.9rem;
}
.design-context p {
  font-size: 0.86rem;
  margin: 0 0 7px;
}
.design-context .secondary {
  grid-column: 2;
  font-size: 0.77rem;
}
.design-tuning {
  margin-top: 12px;
}
.design-tuning summary {
  font-size: 0.86rem;
  font-weight: 550;
  cursor: pointer;
  width: fit-content;
}
.tuning-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
  margin: 20px 0;
}
.tuning-grid select {
  min-width: 0;
  width: 100%;
}
.design-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
  margin: 15px 0;
}
.design-status {
  font-size: 0.77rem;
  color: var(--quiet);
  margin: 14px 0 6px;
}
.design-studio > .secondary {
  margin: 0;
  font-size: 0.77rem;
}
button,
select,
input[type="number"] {
  min-height: 44px;
  border-color: var(--rule);
  border-radius: var(--control-radius);
  background: var(--surface);
}
button:hover {
  background: var(--selected);
}
.view-nav {
  gap: 6px;
  margin-top: 26px;
  padding: 0 0 14px;
}
.view-nav button {
  border: 1px solid transparent;
  background: transparent;
  padding: 10px 16px;
}
.view-nav button[aria-pressed="true"] {
  background: var(--ink);
  color: var(--paper);
}
.controls {
  background: var(--surface);
  border: 1px solid var(--rule);
  border-radius: var(--panel-radius);
  padding: 20px;
  margin: 20px 0;
  gap: 18px;
}
.controls label {
  flex: 1 1 180px;
}
.controls select {
  width: 100%;
  min-width: 0;
  max-width: 100% !important;
}
.controls > button {
  align-self: end;
}
h2,
h3 {
  letter-spacing: -0.025em;
}
.table-scroll {
  border-radius: var(--panel-radius);
}
.heatmap {
  min-width: 640px;
}
.heatmap th:first-child {
  min-width: 140px;
}
.heatmap th button {
  border-radius: 4px;
}
.heatmap .heat-cell {
  border-radius: min(var(--control-radius), 10px);
  background: color-mix(
    in srgb,
    var(--series) calc(var(--intensity) * 0.62),
    var(--surface)
  );
}
.heatmap td {
  padding: 4px;
}
.post-list li {
  padding: 14px 0;
}
.bar-list {
  margin-bottom: 24px;
}
.bar-row {
  margin: 10px 0;
}
.bar-label {
  border-radius: 3px;
  background: transparent;
}
.bar-track,
.bar-fill,
.stack-track {
  border-radius: min(var(--control-radius), 8px);
}
.bar-track,
.stack-track {
  background: color-mix(in srgb, var(--series) 8%, var(--surface));
}
.selection {
  background: var(--surface);
  border-radius: 0 var(--control-radius) var(--control-radius) 0;
  padding: 10px 14px;
}
.style-evidence h3 {
  margin: 20px 0 12px;
}
.design-source-list {
  padding-left: 22px;
}
.design-source-list li {
  padding: 10px 0;
}
.design-source-list p {
  margin: 4px 0;
}
.reading-note {
  padding: 20px;
  background: var(--surface);
  border: 1px solid var(--rule);
  border-radius: var(--panel-radius);
}
.reading-note p {
  max-width: 900px;
}

/* Composition changes affect grouping, never reading order or chart values. */
[data-layout="panels"] .two-column > section,
[data-layout="panels"] .subsection,
[data-layout="bento"] .two-column > section,
[data-layout="bento"] .subsection {
  background: var(--surface);
  border: var(--panel-border) solid var(--rule);
  padding: 24px;
  border-radius: var(--panel-radius);
  min-width: 0;
}
[data-layout="bento"] .two-column {
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  gap: 18px;
}
[data-layout="bento"] .subsection {
  margin: 22px 0;
}
[data-layout="bento"] .table-scroll {
  background: var(--surface);
  padding: 12px;
  border: var(--panel-border) solid var(--rule);
}
[data-layout="open"] .controls {
  background: transparent;
  border-left: 0;
  border-right: 0;
  border-radius: 0;
  padding-left: 0;
  padding-right: 0;
}
[data-depth="quiet"] .design-studio,
[data-depth="quiet"] .subsection {
  box-shadow: 0 3px 0 color-mix(in srgb, var(--ink) 7%, transparent);
}
[data-depth="lifted"] .design-studio,
[data-depth="lifted"] .two-column > section,
[data-depth="lifted"] .subsection {
  box-shadow: 0 var(--shadow-size) calc(var(--shadow-size) * 2.8)
    color-mix(in srgb, var(--ink) 12%, transparent);
}
[data-depth="soft"] .design-studio,
[data-depth="soft"] .controls,
[data-depth="soft"] .two-column > section,
[data-depth="soft"] .subsection {
  box-shadow:
    var(--shadow-size) var(--shadow-size) calc(var(--shadow-size) * 2)
      color-mix(in srgb, var(--ink) 15%, transparent),
    calc(var(--shadow-size) * -1) calc(var(--shadow-size) * -1)
      calc(var(--shadow-size) * 2) color-mix(in srgb, var(--surface) 90%, white);
}
[data-depth="soft"] select {
  box-shadow:
    inset 3px 3px 7px color-mix(in srgb, var(--ink) 9%, transparent),
    inset -3px -3px 7px color-mix(in srgb, var(--surface) 90%, white);
}
[data-depth="glass"] .design-studio,
[data-depth="glass"] .two-column > section,
[data-depth="glass"] .subsection {
  background: color-mix(in srgb, var(--surface) 92%, transparent);
  backdrop-filter: blur(18px);
  box-shadow: 0 var(--shadow-size) 32px
    color-mix(in srgb, var(--series) 9%, transparent);
}
[data-depth="hard"] .design-studio,
[data-depth="hard"] .two-column > section,
[data-depth="hard"] .subsection {
  box-shadow: calc(var(--shadow-size) * 0.55) calc(var(--shadow-size) * 0.55) 0
    var(--ink);
}
[data-depth="hard"] button:not(.bar-label):not(.heat-cell) {
  border-width: 2px;
}
[data-pattern="duotone"] .page-hero {
  padding: 40px 30px;
  margin: 24px 0;
  background: linear-gradient(
    110deg,
    color-mix(in srgb, var(--series) 9%, var(--paper)) 52%,
    color-mix(in srgb, var(--accent) 17%, var(--paper)) 52%
  );
  border-radius: var(--panel-radius);
}
[data-pattern="aurora"] body {
  background:
    radial-gradient(
      ellipse at 6% 0%,
      color-mix(in srgb, var(--series) 12%, transparent),
      transparent 48rem
    ),
    radial-gradient(
      ellipse at 95% 24rem,
      color-mix(in srgb, var(--accent) 14%, transparent),
      transparent 40rem
    ),
    var(--paper);
}
[data-pattern="grid"] .era-signature {
  background-image:
    linear-gradient(
      color-mix(in srgb, var(--rule) 18%, transparent) 1px,
      transparent 1px
    ),
    linear-gradient(
      90deg,
      color-mix(in srgb, var(--rule) 18%, transparent) 1px,
      transparent 1px
    );
  background-size: 22px 22px;
  border: 2px solid var(--ink);
}
[data-pattern="paper"] .era-signature {
  background-color: color-mix(in srgb, var(--accent) 14%, var(--paper));
  background-image: radial-gradient(
    color-mix(in srgb, var(--ink) 18%, transparent) 0.65px,
    transparent 0.65px
  );
  background-size: 5px 5px;
  border: 1px solid var(--rule);
  border-radius: 48% 48% 8px 8px;
}
[data-typography="display"] .page-hero h1 {
  text-transform: uppercase;
}
[data-design-year="2012"]:not([data-reader="true"])
  .view-nav
  button[aria-pressed="true"] {
  background: var(--series);
  color: var(--surface);
}
[data-design-year="2012"]:not([data-reader="true"]) .era-signature {
  border: 0;
  background: var(--series);
  color: var(--surface);
}
[data-design-year="2012"]:not([data-reader="true"]) .era-signature .eyebrow,
[data-design-year="2012"]:not([data-reader="true"]) .era-signature .evidence-kind {
  color: inherit;
}
[data-design-year="2025"]:not([data-reader="true"]) .design-studio {
  border-radius: 36px 12px 36px 12px;
}
[data-density="compact"] .design-studio {
  padding: 18px;
}
[data-density="compact"] .controls {
  gap: 12px;
  padding: 14px;
}
[data-density="compact"] .bar-row {
  margin: 6px 0;
}
[data-density="compact"] th,
[data-density="compact"] td {
  padding-top: 6px;
  padding-bottom: 6px;
}
@media (prefers-reduced-motion: no-preference) {
  body,
  .design-studio,
  .view-nav button {
    transition:
      background-color 160ms ease,
      color 160ms ease,
      border-color 160ms ease;
  }
}
@media (max-width: 960px) {
  main {
    padding: 24px;
  }
  header.page-hero {
    grid-template-columns: minmax(0, 1fr) 180px;
    gap: 22px;
    padding: 36px 0;
  }
  .year-controller {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  }
  .year-step-buttons {
    grid-column: 1 / -1;
    justify-content: end;
  }
  .two-column,
  [data-layout="bento"] .two-column {
    grid-template-columns: 1fr;
  }
}
@media (max-width: 620px) {
  main {
    padding: 18px 16px 36px;
  }
  .masthead {
    align-items: start;
  }
  .method-link {
    max-width: 115px;
  }
  header.page-hero {
    grid-template-columns: 1fr;
    gap: 20px;
    padding: 30px 0;
  }
  h1 {
    font-size: clamp(2rem, 8.5vw, 3.3rem);
  }
  .era-signature {
    display: grid;
    grid-template-columns: auto 1fr;
    align-items: center;
    gap: 8px 18px;
    padding: 16px;
    border: 1px solid var(--rule);
  }
  .era-signature strong {
    grid-row: 1 / 4;
    grid-column: 1;
    font-size: 3.1rem;
  }
  .era-signature .eyebrow,
  #design-name,
  .evidence-kind {
    grid-column: 2;
  }
  .studio-heading {
    flex-direction: column;
    gap: 0;
  }
  .design-studio {
    padding: 18px;
  }
  .year-controller,
  .tuning-grid,
  .design-context {
    grid-template-columns: 1fr;
    gap: 14px;
  }
  .design-context .secondary {
    grid-column: 1;
  }
  .year-step-buttons {
    justify-content: start;
  }
  .tuning-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .design-actions {
    flex-direction: column;
    align-items: stretch;
  }
  .controls {
    padding: 14px;
  }
  [data-layout="panels"] .two-column > section,
  [data-layout="panels"] .subsection,
  [data-layout="bento"] .two-column > section,
  [data-layout="bento"] .subsection {
    padding: 16px;
  }
  [data-pattern="duotone"] .page-hero {
    padding: 24px 16px;
  }
}
@media (max-width: 380px) {
  .tuning-grid {
    grid-template-columns: 1fr;
  }
}
@media print {
  .design-studio,
  .era-signature {
    display: none;
  }
  .page-hero {
    display: block !important;
  }
}

/* Whole-application eras retain motion and system-colour accessibility overrides. */
@media (prefers-reduced-motion: reduce) {
  #tower-explorer *,
  #tower-explorer *::before,
  #tower-explorer *::after {
    animation: none !important;
    transition: none !important;
    scroll-behavior: auto !important;
  }
}
@media (forced-colors: active) {
  :root {
    --paper: Canvas !important;
    --ink: CanvasText !important;
    --muted: CanvasText !important;
    --quiet: CanvasText !important;
    --surface: Canvas !important;
    --rule: ButtonText !important;
    --series: LinkText !important;
  }
  #tower-explorer button {
    border: 1px solid ButtonText;
  }
}