/* ============================================================================
   91233 EXCELLENCE ATLAS
   Rebuilt on the Mr Hart design system: scholarly editorialism with an
   electronic pulse.

   The rules of the system, in short:
     • one warm paper surface, cool ink text — no alternating colour bands;
     • hairline rules and an 8-point rhythm do the structural work;
     • near-square corners (2px). No shadows, no gradients, no rounded cards;
     • two accents used sparingly — a vermilion Signal for emphasis and
       argument, a cool Pulse for interaction and progression;
     • Newsreader for reading, Space Grotesk for interface, IBM Plex Mono for
       metadata;
     • motion is quick, eased, and only ever a response to an action.

   TO CHANGE COLOURS OR TYPE: edit the custom properties in :root.
   Everything below inherits from them.
   ========================================================================== */

/* --------------------------------------------------------------- fallback
   Local fonts, kept so the site still reads correctly with no internet.
   The design system faces are requested from Google Fonts in each page head
   and take precedence when they load. */

@font-face {
  font-family: "Fraunces";
  src: url("./assets/fonts/Fraunces-600.ttf") format("truetype");
  font-style: normal;
  font-weight: 600;
  font-display: swap;
}

@font-face {
  font-family: "Fraunces";
  src: url("./assets/fonts/Fraunces-700.ttf") format("truetype");
  font-style: normal;
  font-weight: 700;
  font-display: swap;
}

@font-face {
  font-family: "Source Sans 3";
  src: url("./assets/fonts/SourceSans3-400.ttf") format("truetype");
  font-style: normal;
  font-weight: 400;
  font-display: swap;
}

@font-face {
  font-family: "Source Sans 3";
  src: url("./assets/fonts/SourceSans3-600.ttf") format("truetype");
  font-style: normal;
  font-weight: 600;
  font-display: swap;
}

@font-face {
  font-family: "Source Sans 3";
  src: url("./assets/fonts/SourceSans3-700.ttf") format("truetype");
  font-style: normal;
  font-weight: 700;
  font-display: swap;
}

/* --------------------------------------------------------------- tokens */

:root {
  /* Surfaces */
  --paper: oklch(0.987 0.004 85);
  --paper-2: oklch(0.968 0.006 85);
  --paper-3: oklch(0.945 0.007 85);

  /* Text */
  --ink: oklch(0.24 0.014 265);
  --ink-2: oklch(0.44 0.012 265);
  /* Muted ink is set to clear AA on every surface, not just on paper —
     a lot of the mono metadata sits on paper-2 cards. */
  --ink-3: oklch(0.525 0.01 265);

  /* Rules */
  --rule: oklch(0.87 0.007 265);
  --rule-2: oklch(0.8 0.01 265);

  /* Accents — swatches, used for fills, borders and rules */
  --signal: oklch(0.585 0.185 32);
  --signal-soft: oklch(0.945 0.038 40);
  --pulse: oklch(0.585 0.135 250);
  --pulse-soft: oklch(0.945 0.032 250);

  /* Text-safe accent variants, a shade darker so accent-coloured *text*
     clears WCAG AA on paper. Use these whenever an accent colours type. */
  --signal-ink: oklch(0.545 0.185 32);
  --pulse-ink: oklch(0.53 0.135 250);

  --on-accent: oklch(0.99 0 0);

  /* Semantic accents: the two argument sides, plus event and debate. */
  --band-cause: var(--signal-ink);
  --band-consequence: var(--pulse-ink);
  --band-event: oklch(0.48 0.09 150);
  --band-debate: oklch(0.48 0.13 300);

  /* Type */
  --serif: "Newsreader", "Fraunces", Georgia, "Times New Roman", serif;
  --sans: "Space Grotesk", "Source Sans 3", -apple-system, BlinkMacSystemFont,
    "Segoe UI", sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas,
    monospace;

  /* 8-point rhythm */
  --s1: 8px;
  --s2: 16px;
  --s3: 24px;
  --s4: 32px;
  --s5: 40px;
  --s6: 48px;
  --s8: 64px;
  --s10: 80px;

  --radius: 2px;
  --measure: 1240px;
}

/* ---------------------------------------------------------------- reset */

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

::selection {
  background: var(--signal);
  color: var(--paper);
}

:focus-visible {
  outline: 2px solid var(--pulse);
  outline-offset: 3px;
}

a {
  color: var(--signal-ink);
  text-decoration: none;
  transition: color 0.18s;
}

a:hover {
  color: var(--pulse-ink);
}

h1,
h2,
h3,
h4 {
  font-family: var(--serif);
  font-weight: 500;
  letter-spacing: -0.02em;
  margin: 0;
}

p {
  margin: 0;
}

code {
  font-family: var(--mono);
  font-size: 0.9em;
  background: var(--paper-2);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  padding: 1px 5px;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* ========================================================================
   SHELL
   ======================================================================== */

.section-frame {
  max-width: var(--measure);
  margin: 0 auto;
  padding: 0 28px;
}

/* --------------------------------------------------------------- topbar */

.topbar {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in oklch, var(--paper) 88%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--rule);
}

.topbar__inner {
  max-width: var(--measure);
  margin: 0 auto;
  padding: 0 28px;
  height: 66px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--s3);
}

.topbar__brand {
  display: flex;
  align-items: center;
  gap: 14px;
  min-width: 0;
  color: inherit;
  flex: none;
}

.topbar__brand:hover {
  color: inherit;
}

/* The mark: a Signal square with a Pulse square escaping its corner. */
.topbar__glyph {
  width: 26px;
  height: 26px;
  background: var(--signal);
  position: relative;
  flex: none;
}

.topbar__glyph::after {
  content: "";
  position: absolute;
  right: -5px;
  bottom: -5px;
  width: 12px;
  height: 12px;
  background: var(--pulse);
}

.topbar__name {
  font-family: var(--sans);
  font-weight: 700;
  font-size: 15px;
  letter-spacing: 0.02em;
  line-height: 1;
  white-space: nowrap;
}

.topbar__sub {
  font-family: var(--mono);
  font-size: 9.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin-top: 3px;
  white-space: nowrap;
}

.topbar__links {
  display: flex;
  gap: var(--s3);
  overflow-x: auto;
  scrollbar-width: thin;
  min-width: 0;
}

.topbar__links::-webkit-scrollbar {
  height: 5px;
}

.topbar__links::-webkit-scrollbar-thumb {
  background: var(--rule-2);
  border-radius: 3px;
}

.topbar__links a {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-3);
  border-bottom: 2px solid transparent;
  padding: 22px 1px;
  white-space: nowrap;
  transition: color 0.18s, border-color 0.18s;
}

.topbar__links a:hover {
  color: var(--ink);
  border-color: var(--signal);
}

/* ----------------------------------------------------------------- hero */

.hero {
  border-bottom: 1px solid var(--rule);
}

.hero__body {
  max-width: var(--measure);
  margin: 0 auto;
  padding: var(--s10) 28px var(--s8);
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: var(--s6);
  align-items: start;
}

.hero h1 {
  font-size: clamp(38px, 6vw, 82px);
  line-height: 0.98;
  letter-spacing: -0.028em;
  margin: 0 0 var(--s3);
  max-width: 16ch;
}

.hero__lede {
  font-family: var(--serif);
  font-size: clamp(18px, 2vw, 22px);
  line-height: 1.5;
  color: var(--ink-2);
  max-width: 56ch;
  margin: 0 0 var(--s4);
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: var(--s4);
}

.hero__signal {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--rule);
}

.hero__signal li {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--ink-2);
  padding: 10px 0;
  border-bottom: 1px solid var(--rule);
  display: flex;
  gap: 12px;
  align-items: baseline;
}

.hero__signal li::before {
  content: "·";
  color: var(--signal-ink);
  flex: none;
}

.hero__panel {
  display: grid;
  gap: var(--s3);
  align-content: start;
}

.signal-card {
  border: 1px solid var(--rule);
  border-left: 3px solid var(--signal);
  background: var(--signal-soft);
  border-radius: var(--radius);
  padding: var(--s3);
}

.signal-card__label {
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--signal-ink);
  margin-bottom: var(--s1);
}

.signal-card__text {
  font-family: var(--serif);
  font-size: 18px;
  line-height: 1.45;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 1px;
  background: var(--rule);
  border: 1px solid var(--rule);
}

.hero-stat {
  background: var(--paper);
  padding: var(--s3) var(--s2);
}

.hero-stat__value {
  font-family: var(--serif);
  font-size: 32px;
  line-height: 1;
  margin-bottom: 6px;
}

.hero-stat__label {
  font-family: var(--sans);
  font-weight: 600;
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--signal-ink);
  margin-bottom: 6px;
}

.hero-stat__note {
  font-size: 13px;
  line-height: 1.45;
  color: var(--ink-2);
}

/* A hairline route across the key dates. */
.hero__timeline {
  display: flex;
  flex-wrap: wrap;
  gap: var(--s2);
  border-top: 1px solid var(--rule);
  padding-top: var(--s2);
}

.hero__timeline span {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--ink-3);
  position: relative;
  padding-left: 12px;
}

.hero__timeline span::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 5px;
  height: 5px;
  background: var(--rule-2);
}

.hero__timeline span:last-child {
  color: var(--signal-ink);
}

.hero__timeline span:last-child::before {
  background: var(--signal);
}

/* -------------------------------------------------------------- section */

.section {
  border-bottom: 1px solid var(--rule);
  padding: var(--s10) 0;
}

.section:last-of-type {
  border-bottom: 0;
}

.section-heading {
  margin-bottom: var(--s6);
}

.section-heading h2 {
  font-size: clamp(28px, 4vw, 52px);
  line-height: 1.02;
  margin: 0 0 var(--s2);
  max-width: 22ch;
}

.section-heading p {
  font-family: var(--serif);
  font-size: clamp(17px, 1.7vw, 20px);
  line-height: 1.5;
  color: var(--ink-2);
  max-width: 60ch;
}

.eyebrow {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--signal-ink);
  margin: 0 0 var(--s3);
}

.footer {
  border-top: 1px solid var(--rule);
  padding: var(--s5) 28px;
  max-width: var(--measure);
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  gap: var(--s2);
  justify-content: space-between;
  align-items: center;
}

.footer p {
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.08em;
  color: var(--ink-3);
  max-width: 70ch;
  line-height: 1.7;
}

/* ========================================================================
   CONTROLS AND LABELS
   ======================================================================== */

.button {
  font-family: var(--sans);
  font-weight: 600;
  font-size: 14px;
  border-radius: var(--radius);
  padding: 12px 22px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 9px;
  border: 1px solid transparent;
  text-decoration: none;
  transition: transform 0.16s, border-color 0.16s, background 0.16s,
    color 0.16s;
}

.button--solid {
  background: var(--signal-ink);
  color: var(--on-accent);
  border-color: var(--signal-ink);
}

.button--solid:hover {
  transform: translateY(-1px);
  color: var(--on-accent);
}

.button--ghost {
  background: transparent;
  color: var(--ink);
  border-color: var(--rule-2);
}

.button--ghost:hover {
  border-color: var(--ink);
  color: var(--ink);
}

.button--small {
  font-size: 12.5px;
  padding: 9px 14px;
}

.chip-row,
.mode-switch {
  display: flex;
  flex-wrap: wrap;
  gap: var(--s1);
  margin-bottom: var(--s4);
}

.chip {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-2);
  background: transparent;
  border: 1px solid var(--rule-2);
  border-radius: var(--radius);
  padding: 9px 14px;
  cursor: pointer;
  transition: border-color 0.18s, color 0.18s, background 0.18s;
}

.chip:hover:not(:disabled) {
  border-color: var(--ink-3);
  color: var(--ink);
}

.chip--active {
  background: var(--signal-ink);
  border-color: var(--signal-ink);
  color: var(--on-accent);
}

.chip:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}

/* Small uppercase mono label, used above every output block. */
.output-card__label,
.detail-block__label,
.field__label,
.marker-next__label {
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin: 0 0 var(--s1);
}

.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: var(--s2);
}

.tag-row span {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-3);
  background: var(--paper-2);
  border-radius: var(--radius);
  padding: 4px 8px;
}

.empty-state {
  font-family: var(--serif);
  font-size: 18px;
  line-height: 1.5;
  color: var(--ink-3);
  border: 1px dashed var(--rule-2);
  border-radius: var(--radius);
  padding: var(--s3);
}

/* Form fields */

.field {
  margin-bottom: var(--s3);
}

.field label {
  display: block;
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin-bottom: var(--s1);
}

select,
input[type="search"],
textarea {
  width: 100%;
  font-family: var(--sans);
  font-size: 15px;
  color: var(--ink);
  background: var(--paper);
  border: 1px solid var(--rule-2);
  border-radius: var(--radius);
  padding: 11px 13px;
  transition: border-color 0.18s;
}

textarea {
  font-family: var(--serif);
  font-size: 17px;
  line-height: 1.5;
  resize: vertical;
}

select:hover,
input[type="search"]:hover,
textarea:hover {
  border-color: var(--ink-3);
}

.search {
  display: block;
  min-width: 260px;
  flex: 1;
}

/* ========================================================================
   THE BLOCK — the workhorse container
   Replaces the old rounded, shadowed card: a hairline box on paper.
   ======================================================================== */

.card {
  background: var(--paper-2);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  padding: var(--s3);
}

.detail-block {
  border-top: 1px solid var(--rule);
  padding-top: var(--s2);
  margin-top: var(--s2);
}

.detail-block p:not(.detail-block__label) {
  font-family: var(--serif);
  font-size: 17px;
  line-height: 1.5;
}

.detail-block ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

.detail-block li {
  font-family: var(--serif);
  font-size: 16.5px;
  line-height: 1.45;
  padding: 5px 0 5px 18px;
  position: relative;
}

.detail-block li::before {
  content: "—";
  position: absolute;
  left: 0;
  color: var(--signal-ink);
}

.detail-block--bound {
  border-left: 3px solid var(--pulse);
  border-top: 0;
  padding: var(--s1) 0 var(--s1) var(--s2);
}

.detail-block--deploy {
  border-left: 3px solid var(--signal);
  border-top: 0;
  background: var(--signal-soft);
  border-radius: var(--radius);
  padding: var(--s2);
}

/* ========================================================================
   SECTION 1 — EXAM PATTERN
   ======================================================================== */

.pattern-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1px;
  background: var(--rule);
  border: 1px solid var(--rule);
}

.pattern-card {
  background: var(--paper);
  padding: var(--s3);
  transition: background 0.18s;
}

.pattern-card:hover {
  background: var(--paper-2);
}

.pattern-card__top {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--s2);
  margin-bottom: var(--s2);
}

.pattern-card__year {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-3);
}

.pattern-card__kind,
.evidence-card__type,
.drill-card__kind {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  border: 1px solid currentColor;
  border-radius: var(--radius);
  padding: 4px 8px;
  flex: none;
  color: var(--ink-3);
}

.pattern-card__kind--cause,
.evidence-card__type--cause,
.drill-card__kind--cause {
  color: var(--band-cause);
}

.pattern-card__kind--consequence,
.evidence-card__type--consequence,
.drill-card__kind--consequence {
  color: var(--band-consequence);
}

.pattern-card__kind--flex,
.evidence-card__type--event {
  color: var(--band-event);
}

.evidence-card__type--debate {
  color: var(--band-debate);
}

.pattern-card__question {
  font-family: var(--serif);
  font-size: 20px;
  line-height: 1.3;
  margin-bottom: var(--s2);
}

.pattern-card__move {
  font-size: 14px;
  line-height: 1.55;
  color: var(--ink-2);
}

/* ========================================================================
   SECTION 2 — EVENT ATLAS (timeline)
   ======================================================================== */

.timeline {
  border-left: 1px solid var(--rule-2);
  margin-left: 6px;
}

.timeline-card {
  position: relative;
  display: grid;
  grid-template-columns: 150px 1fr;
  gap: var(--s3);
  padding: 0 0 var(--s5) var(--s4);
}

/* The marker on the spine. Its colour carries the band. */
.timeline-card::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 6px;
  width: 9px;
  height: 9px;
  background: var(--ink-3);
}

.timeline-card--cause::before {
  background: var(--band-cause);
}

.timeline-card--event::before {
  background: var(--band-event);
}

.timeline-card--consequence::before {
  background: var(--band-consequence);
}

.timeline-card__date {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--pulse-ink);
  padding-top: 2px;
}

.timeline-card__span {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin-bottom: 6px;
}

.timeline-card__body h3 {
  font-size: 23px;
  line-height: 1.2;
  margin-bottom: 6px;
}

.timeline-card__detail {
  font-family: var(--serif);
  font-size: 17px;
  line-height: 1.5;
  color: var(--ink-2);
}

.timeline-card__bound {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--ink-3);
  border-left: 2px solid var(--pulse);
  padding-left: 12px;
  margin-top: var(--s1);
}

.timeline-card__exam {
  font-family: var(--sans);
  font-size: 14px;
  line-height: 1.55;
  color: var(--ink-2);
  border-top: 1px solid var(--rule);
  padding-top: var(--s1);
  margin-top: var(--s2);
}

/* ========================================================================
   SECTION 3 — ARGUMENT LAB
   ======================================================================== */

.argument-layout {
  display: grid;
  grid-template-columns: 340px 1fr;
  gap: var(--s5);
  align-items: start;
}

.argument-list {
  display: grid;
  gap: 1px;
  background: var(--rule);
  border: 1px solid var(--rule);
}

.argument-card {
  display: block;
  width: 100%;
  text-align: left;
  background: var(--paper);
  border: 0;
  border-left: 3px solid transparent;
  padding: var(--s3) var(--s2);
  cursor: pointer;
  font-family: inherit;
  color: inherit;
  transition: background 0.18s, border-color 0.18s;
}

.argument-card:hover {
  background: var(--paper-2);
}

.argument-card--active {
  background: var(--paper-2);
  border-left-color: var(--signal);
}

.argument-card__tag {
  display: block;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--signal-ink);
  margin-bottom: 6px;
}

.argument-card__title {
  display: block;
  font-family: var(--serif);
  font-weight: 500;
  font-size: 19px;
  line-height: 1.25;
  margin-bottom: 5px;
}

.argument-card__summary {
  display: block;
  font-size: 13.5px;
  line-height: 1.5;
  color: var(--ink-2);
}

.argument-detail h3 {
  font-size: 30px;
  line-height: 1.1;
  margin-bottom: var(--s1);
}

.argument-detail__tag {
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--signal-ink);
  margin-bottom: var(--s1);
}

.argument-detail__summary {
  font-family: var(--serif);
  font-size: 19px;
  line-height: 1.5;
  color: var(--ink-2);
}

/* ========================================================================
   SECTION 4 — EVIDENCE BANK
   ======================================================================== */

.evidence-controls {
  display: flex;
  flex-wrap: wrap;
  gap: var(--s2);
  align-items: flex-start;
  margin-bottom: var(--s2);
}

.evidence-controls .chip-row {
  margin-bottom: 0;
}

.evidence-meta {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-3);
  border-top: 1px solid var(--rule);
  padding-top: var(--s2);
  margin-bottom: var(--s3);
}

.evidence-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1px;
  background: var(--rule);
  border: 1px solid var(--rule);
}

.evidence-card {
  background: var(--paper);
  padding: var(--s3);
  transition: background 0.18s;
}

.evidence-card:hover {
  background: var(--paper-2);
}

.evidence-card__top {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--s2);
  margin-bottom: var(--s2);
}

.evidence-card__label {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--pulse-ink);
}

.evidence-card h3 {
  font-size: 21px;
  line-height: 1.2;
  margin-bottom: var(--s1);
}

.evidence-card__summary {
  font-family: var(--serif);
  font-size: 16.5px;
  line-height: 1.5;
  color: var(--ink-2);
}

.evidence-card__exam {
  font-family: var(--sans);
  font-size: 13.5px;
  line-height: 1.55;
  color: var(--ink-2);
  border-left: 2px solid var(--signal);
  padding-left: 12px;
  margin-top: var(--s2);
}

/* ========================================================================
   SECTION 5 — HISTORIOGRAPHY ARENA
   ======================================================================== */

.historiography-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(360px, 1fr));
  gap: var(--s3);
}

.debate-card__fits {
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--band-debate);
  margin-bottom: var(--s1);
}

.debate-card h3 {
  font-size: 24px;
  line-height: 1.15;
  margin-bottom: var(--s2);
}

.debate-card__tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: var(--s2);
}

.debate-card__tabs .chip {
  font-size: 10px;
  padding: 7px 11px;
}

.debate-card__holders {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--ink-3);
  margin-bottom: 6px;
}

.debate-card__claim {
  font-family: var(--serif);
  font-size: 18px;
  line-height: 1.5;
}

/* ========================================================================
   SECTION 6 — ESSAY STUDIO
   ======================================================================== */

.studio-layout {
  display: grid;
  grid-template-columns: 380px 1fr;
  gap: var(--s5);
  align-items: start;
}

.studio-panel {
  position: sticky;
  top: 86px;
}

.selector-grid {
  display: grid;
  gap: 6px;
}

.selector-card {
  display: block;
  width: 100%;
  text-align: left;
  background: var(--paper);
  border: 1px solid var(--rule-2);
  border-radius: var(--radius);
  padding: 12px 14px;
  cursor: pointer;
  font-family: inherit;
  color: inherit;
  transition: border-color 0.18s, background 0.18s;
}

.selector-card:hover {
  border-color: var(--pulse);
  background: var(--pulse-soft);
}

.selector-card--active {
  border-color: var(--signal);
  background: var(--signal-soft);
}

.selector-card__tag {
  display: block;
  font-family: var(--mono);
  font-size: 9.5px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--signal-ink);
  margin-bottom: 4px;
}

.selector-card__title {
  font-family: var(--serif);
  font-weight: 500;
  font-size: 17px;
  line-height: 1.25;
}

.timer-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--s1);
  align-items: center;
}

.timer-pill {
  font-family: var(--mono);
  font-size: 15px;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.06em;
  color: var(--ink);
  border: 1px solid var(--rule-2);
  border-radius: var(--radius);
  padding: 9px 14px;
  margin-left: auto;
}

.timer-pill--ending {
  color: var(--signal-ink);
  border-color: var(--signal);
  background: var(--signal-soft);
}

.studio-output {
  display: grid;
  gap: var(--s3);
}

.output-card {
  background: var(--paper);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  padding: var(--s3);
}

.output-card__text {
  font-family: var(--serif);
  font-size: 18px;
  line-height: 1.55;
}

.precision-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.precision-list li {
  padding: 10px 0;
  border-bottom: 1px solid var(--rule);
}

.precision-list li:last-child {
  border-bottom: 0;
}

.precision-list__label {
  display: block;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--pulse-ink);
  margin-bottom: 4px;
}

.precision-list__value {
  font-size: 15px;
  line-height: 1.55;
  color: var(--ink-2);
}

.paragraph-card {
  border-top: 1px solid var(--rule);
  padding-top: var(--s2);
  margin-top: var(--s2);
}

.paragraph-card:first-child {
  border-top: 0;
  padding-top: 0;
  margin-top: 0;
}

.paragraph-card__label {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--pulse-ink);
  margin-bottom: 5px;
}

.paragraph-card h4 {
  font-size: 21px;
  line-height: 1.2;
  margin-bottom: var(--s1);
}

.paragraph-card__link {
  font-family: var(--serif);
  font-size: 17px;
  line-height: 1.5;
}

.paragraph-card ul {
  margin: var(--s1) 0;
  padding: 0;
  list-style: none;
}

.paragraph-card li {
  font-size: 14.5px;
  line-height: 1.5;
  color: var(--ink-2);
  padding: 4px 0 4px 18px;
  position: relative;
}

.paragraph-card li::before {
  content: "—";
  position: absolute;
  left: 0;
  color: var(--rule-2);
}

.paragraph-card__bound {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--ink-3);
  border-left: 2px solid var(--pulse);
  padding-left: 12px;
  margin-top: var(--s1);
}

.paragraph-card__insight {
  font-family: var(--sans);
  font-size: 14.5px;
  line-height: 1.55;
  color: var(--ink-2);
  border-left: 2px solid var(--signal);
  padding-left: 12px;
  margin-top: var(--s1);
}

.paragraph-card__prompt {
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.06em;
  color: var(--ink-3);
  margin-top: var(--s1);
}

/* ========================================================================
   SECTION 7 — CAUSAL GYM
   ======================================================================== */

.drill-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(330px, 1fr));
  gap: var(--s3);
  margin-bottom: var(--s8);
}

.drill-card__top {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--s2);
  margin-bottom: var(--s2);
}

.drill-card__wording {
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-3);
}

.drill-card__label {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin: var(--s2) 0 5px;
}

.drill-card__weak {
  font-family: var(--serif);
  font-size: 17px;
  line-height: 1.45;
  color: var(--ink-2);
  border-left: 2px solid var(--rule-2);
  padding-left: 14px;
}

.drill-card__strong {
  font-family: var(--serif);
  font-size: 17px;
  line-height: 1.45;
  border-left: 2px solid var(--signal);
  padding-left: 14px;
}

.drill-card__moves {
  margin: 0 0 var(--s2);
  padding: 0;
  list-style: none;
}

.drill-card__moves li {
  font-size: 13.5px;
  line-height: 1.5;
  color: var(--ink-2);
  padding: 5px 0 5px 18px;
  position: relative;
}

.drill-card__moves li::before {
  content: "→";
  position: absolute;
  left: 0;
  font-family: var(--mono);
  color: var(--pulse-ink);
}

.pivot-block h3 {
  font-size: 28px;
  margin-bottom: var(--s1);
}

.pivot-block__note {
  font-family: var(--serif);
  font-size: 18px;
  line-height: 1.5;
  color: var(--ink-2);
  max-width: 60ch;
  margin-bottom: var(--s3);
}

.pivot-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: var(--s3);
}

.pivot-card h4 {
  font-size: 20px;
  line-height: 1.2;
}

.pivot-card__list {
  margin: 0;
}

.pivot-card__row {
  border-top: 1px solid var(--rule);
  padding: var(--s2) 0;
}

.pivot-card__row dt {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--pulse-ink);
  margin-bottom: 5px;
}

.pivot-card__row dd {
  margin: 0;
  font-family: var(--serif);
  font-size: 16.5px;
  line-height: 1.45;
}

/* ========================================================================
   SECTION 8 — EXEMPLAR PAGE LINKS
   ======================================================================== */

.page-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1px;
  background: var(--rule);
  border: 1px solid var(--rule);
}

.exemplar-link-card {
  background: var(--paper);
  border: 0;
  border-radius: 0;
  display: flex;
  flex-direction: column;
  padding: var(--s4) var(--s3);
  transition: background 0.18s;
}

.exemplar-link-card:hover {
  background: var(--paper-2);
}

.exemplar-link-card h3 {
  font-size: 26px;
  line-height: 1.12;
  margin-bottom: var(--s1);
}

.exemplar-link-card > p {
  font-family: var(--serif);
  font-size: 17px;
  line-height: 1.45;
  color: var(--ink-2);
  margin-bottom: var(--s2);
}

.exemplar-link-card ul {
  list-style: none;
  margin: 0 0 var(--s3);
  padding: 0;
  border-top: 1px solid var(--rule);
}

.exemplar-link-card li {
  font-size: 13.5px;
  line-height: 1.5;
  color: var(--ink-2);
  padding: 8px 0;
  border-bottom: 1px solid var(--rule);
}

.exemplar-link-card .button {
  margin-top: auto;
  align-self: flex-start;
}

/* ========================================================================
   SECTION 9 — MARKER MODE
   ======================================================================== */

.marker-layout {
  display: grid;
  grid-template-columns: 1.3fr 1fr;
  gap: var(--s5);
  align-items: start;
}

.marker-form {
  display: grid;
  gap: 0;
  padding: 0;
  background: var(--paper);
}

.marker-form label {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  font-size: 15px;
  line-height: 1.5;
  color: var(--ink-2);
  padding: 13px var(--s2);
  border-bottom: 1px solid var(--rule);
  cursor: pointer;
  transition: background 0.18s;
}

.marker-form label:last-child {
  border-bottom: 0;
}

.marker-form label:hover {
  background: var(--paper-2);
}

.marker-form input {
  margin: 3px 0 0;
  accent-color: var(--signal-ink);
  flex: none;
}

.marker-result {
  position: sticky;
  top: 86px;
  background: var(--paper);
}

.marker-result__grade {
  font-family: var(--serif);
  font-size: 46px;
  line-height: 1;
  margin: var(--s1) 0 var(--s2);
}

.marker-result__grade--excellence {
  color: var(--signal-ink);
}

.marker-result__grade--merit {
  color: var(--pulse-ink);
}

.marker-result__grade--achievement {
  color: var(--band-event);
}

.marker-result__grade--not-achieved {
  color: var(--ink-3);
}

.marker-result__summary {
  font-family: var(--serif);
  font-size: 17px;
  line-height: 1.5;
  color: var(--ink-2);
}

.marker-next {
  border-top: 1px solid var(--rule);
  padding-top: var(--s2);
  margin-top: var(--s2);
}

.marker-next ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

.marker-next li {
  font-size: 14px;
  line-height: 1.55;
  color: var(--ink-2);
  padding: 7px 0 7px 18px;
  position: relative;
}

.marker-next li::before {
  content: "→";
  position: absolute;
  left: 0;
  font-family: var(--mono);
  color: var(--pulse-ink);
}

/* ========================================================================
   SECTION 10 — RESOURCE VAULT
   ======================================================================== */

.resource-groups {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: var(--s3);
}

.resource-group {
  background: var(--paper);
  padding: 0;
  overflow: hidden;
}

.resource-group__head {
  padding: var(--s3);
  border-bottom: 1px solid var(--rule);
}

.resource-group__head h3 {
  font-size: 22px;
  line-height: 1.15;
  margin-bottom: 6px;
}

.resource-group__head p {
  font-size: 13.5px;
  line-height: 1.55;
  color: var(--ink-2);
}

.resource-link {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: var(--s2);
  padding: 12px var(--s3);
  border-bottom: 1px solid var(--rule);
  color: inherit;
  transition: background 0.18s;
}

.resource-link:last-child {
  border-bottom: 0;
}

.resource-link:hover {
  background: var(--paper-2);
  color: inherit;
}

.resource-link__title {
  font-size: 14.5px;
  line-height: 1.4;
}

.resource-link__meta {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-3);
  flex: none;
}

/* ========================================================================
   SECTION 11 — REFERENCES
   ======================================================================== */

.reference-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1px;
  background: var(--rule);
  border: 1px solid var(--rule);
}

.reference-card {
  background: var(--paper);
  padding: var(--s3);
}

.reference-card h3 {
  font-size: 19px;
  line-height: 1.25;
  margin-bottom: var(--s1);
}

.reference-card p {
  font-size: 14px;
  line-height: 1.55;
  color: var(--ink-2);
}

/* ========================================================================
   EXEMPLAR PAGES
   ======================================================================== */

.guide-stack {
  display: grid;
  gap: var(--s4);
}

.exemplar-card {
  background: var(--paper);
  border-left: 3px solid var(--signal);
}

.exemplar-card h3 {
  font-size: 28px;
  line-height: 1.1;
  margin-bottom: var(--s1);
}

.exemplar-card__prompt {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--pulse-ink);
  margin-bottom: var(--s2);
}

.exemplar-card__lead {
  font-family: var(--serif);
  font-size: 18px;
  line-height: 1.5;
  color: var(--ink-2);
}

.exemplar-columns {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: var(--s3);
}

.utility-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1px;
  background: var(--rule);
  border: 1px solid var(--rule);
}

.utility-card {
  background: var(--paper);
  border: 0;
  border-radius: 0;
  padding: var(--s3);
}

.utility-card h3 {
  font-size: 21px;
  line-height: 1.2;
  margin-bottom: var(--s1);
}

.utility-card p {
  font-size: 14.5px;
  line-height: 1.55;
  color: var(--ink-2);
}

.utility-card ul {
  list-style: none;
  margin: var(--s1) 0 0;
  padding: 0;
}

.utility-card li {
  font-size: 14px;
  line-height: 1.5;
  color: var(--ink-2);
  padding: 6px 0 6px 18px;
  position: relative;
}

.utility-card li::before {
  content: "—";
  position: absolute;
  left: 0;
  color: var(--signal-ink);
}

.note-strip {
  border-left: 3px solid var(--pulse);
  background: var(--pulse-soft);
  border-radius: var(--radius);
  padding: var(--s3);
  margin-top: var(--s4);
}

.note-strip p {
  font-family: var(--serif);
  font-size: 18px;
  line-height: 1.5;
}

/* ========================================================================
   MOTION — quick, eased, only in response to arriving on screen
   ======================================================================== */

/* The reveal is opt-in: app.js adds .js-reveal to <html> before it starts
   observing. Pages that load no JavaScript — and browsers with JS disabled —
   therefore render everything visible instead of a blank page. */
.js-reveal .reveal {
  opacity: 0;
  transform: translateY(10px);
  transition: opacity 0.4s cubic-bezier(0.2, 0.7, 0.2, 1),
    transform 0.4s cubic-bezier(0.2, 0.7, 0.2, 1);
}

.js-reveal .reveal--visible {
  opacity: 1;
  transform: none;
}

/* ========================================================================
   RESPONSIVE
   ======================================================================== */

@media (max-width: 1100px) {
  .hero__body,
  .argument-layout,
  .studio-layout,
  .marker-layout {
    grid-template-columns: 1fr;
  }

  .studio-panel,
  .marker-result {
    position: static;
  }
}

@media (max-width: 820px) {
  .section {
    padding: var(--s8) 0;
  }

  .section-frame,
  .hero__body,
  .footer {
    padding-left: 20px;
    padding-right: 20px;
  }

  .topbar__inner {
    height: auto;
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    padding: 14px 20px 0;
  }

  .topbar__links a {
    padding: 12px 1px;
  }

  .timeline-card {
    grid-template-columns: 1fr;
    gap: var(--s1);
    padding-left: var(--s3);
  }

  .evidence-controls {
    flex-direction: column;
  }

  .search {
    width: 100%;
  }

  .timer-pill {
    margin-left: 0;
  }
}

/* ========================================================================
   REDUCED MOTION
   ======================================================================== */

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    transition-duration: 0.001ms !important;
  }

  .js-reveal .reveal {
    opacity: 1;
    transform: none;
  }
}

/* ========================================================================
   PRINT
   ======================================================================== */

@media print {
  @page {
    margin: 16mm;
  }

  body {
    background: #fff;
    color: #000;
  }

  .topbar,
  .hero__actions,
  .chip-row,
  .mode-switch,
  .evidence-controls,
  .timer-row,
  .button {
    display: none !important;
  }

  .section {
    padding: 0 0 12mm;
    break-inside: avoid;
  }

  .js-reveal .reveal {
    opacity: 1 !important;
    transform: none !important;
  }

  .studio-panel,
  .marker-result {
    position: static;
  }

  .card,
  .output-card,
  .pattern-card,
  .evidence-card {
    background: none !important;
    border-color: #999 !important;
    break-inside: avoid;
  }
}