/*
 * The coal design system — shared by index.html and speaking.html.
 *
 * Set in the same language as assets/css/f1.css: one continuous coal ground, hairline
 * rules instead of panels, and a wide gap in size between a figure and its label. The
 * constraints that file states are the constraints here too, and they are deliberate —
 * there is no card, no rounded corner (bar the nav toggle), no box-shadow and no
 * alternating light/dark band anywhere. Those were exactly what made five different
 * sections read as five copies of the same one.
 *
 * Three type roles, strictly separated. Chivo Mono is the UI voice and carries every
 * eyebrow, label, index, figure and readout — plus the opening title, set at 700
 * uppercase on tight tracking. Fraunces is reserved for two things only: chapter
 * titles and figure-size names. Inter sets prose and nothing else.
 *
 * The accent is Spa-Francorchamps' Ardennes mist, borrowed from CIRCUIT_COLOURS in
 * f1-circuit.js. It is fixed here rather than derived at runtime, because unlike /f1
 * there is only ever one circuit — see the three tones under :root.
 *
 * This file holds only what more than one page uses: the tokens, the motion
 * primitives, the header, the opening type, and the four row grids that hang off the
 * margin spine. Anything a single page owns lives beside it — home-coal.css has the
 * homepage's opening frame, shimmer and intro overlay; speaking.css has the talk map
 * and the filter rail; dashboard-coal.css has the X-ray trace behind the opening, the
 * panel rows the widgets sit in and the Leaflet overrides. Load this file first; all
 * three depend on its tokens.
 *
 * Not loaded on the rest of the site. cv.html still runs on home.css and is still
 * gold; eclipse and f1 are off-palette by their own design.
 */

:root {
  --coal: #111214;
  --line: rgba(236, 238, 240, 0.14);
  --line-strong: rgba(236, 238, 240, 0.28);
  --ink: #eceef0;
  --ink-soft: #9aa0a6;
  --ink-faint: #6b7178;
  --chalk: #f6f7f8;

  /*
   * Spa's colour in three tones, the same contract f1.css:31-37 sets out. Ratios are
   * measured against the coal ground (relative luminance 0.00602):
   *   --accent-deep  #5A7566  3.7:1  large fills, the intro glyph
   *   --accent       #6E8A78  5.0:1  rules, borders, hover
   *   --accent-soft  #7E9C89  6.2:1  accent text — figures, the brand dot, numbers
   * Anything that carries words uses --accent-soft. Anything that is a line uses
   * --accent. Nothing on these pages is large enough to need --accent-deep except the
   * overlay glyph, which is one stroke on an otherwise empty screen.
   */
  --accent-deep: #5a7566;
  --accent: #6e8a78;
  --accent-soft: #7e9c89;
  --accent-rgb: 110, 138, 120;

  --font-display: "Fraunces", Georgia, "Times New Roman", serif;
  --font-body: "Inter", "Helvetica Neue", Arial, sans-serif;
  --font-mono: "Chivo Mono", "Courier New", monospace;
  --maxw: 1180px;

  --fs-chapter: clamp(2.6rem, 7vw, 5.5rem);
  --fs-figure: clamp(2.4rem, 6vw, 4.6rem);
  --fs-micro: 0.58rem;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);

  /* Width of the left margin column that carries chapter numbers and hanging labels. */
  --margin-col: 13rem;
}

* {
  box-sizing: border-box;
}

/*
 * Safe to set globally: unlike /f1 there is no scroll library on these pages to fight
 * with, so the nav anchors can use the browser's own smooth scroll.
 */
html {
  scroll-behavior: smooth;
}

html,
body {
  margin: 0;
  padding: 0;
  background: var(--coal);
  color: var(--ink);
  font-family: var(--font-body);
  letter-spacing: -0.006em;
  -webkit-font-smoothing: antialiased;
}

body {
  min-height: 100%;
  overflow-x: hidden;
}

a {
  color: inherit;
}

.wrap {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 1.4rem;
}

/*
 * Full-bleed escape from .wrap. body already has overflow-x: hidden, so the 100vw
 * cannot open a horizontal scrollbar of its own.
 */
.bleed {
  width: 100vw;
  margin-left: calc(50% - 50vw);
}

/* ---------- Motion primitives ---------- */

/*
 * The same 40px/900ms reveal /f1 uses, rather than the site's older 28px/700ms: with
 * no photograph and no canvas on the homepage, these are the only motion on it and a
 * shorter throw reads as a twitch. --d is a stagger index written per direct child by
 * the observer in home-coal.js and speaking.js; unset it reads as 0 and the element
 * moves on its own.
 */
.reveal {
  opacity: 0;
  transform: translateY(40px);
}

.reveal.is-in {
  opacity: 1;
  transform: none;
  transition: opacity 900ms var(--ease), transform 900ms var(--ease);
  transition-delay: calc(var(--d, 0) * 70ms);
}

/*
 * Masked line reveal: the outer span clips, the inner one rises into it. Needs the
 * inner to be a block so the transform has a box to move.
 */
.line-mask {
  display: block;
  overflow: hidden;
  /* Descenders in Fraunces sit below the line box and would be clipped otherwise. */
  padding-bottom: 0.12em;
  margin-bottom: -0.12em;
}

.line-mask > span {
  display: block;
  transform: translateY(105%);
  transition: transform 1000ms var(--ease);
  transition-delay: calc(var(--d, 0) * 70ms);
}

.reveal.is-in .line-mask > span,
.line-mask.is-in > span {
  transform: none;
}

.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;
}

@media (prefers-reduced-motion: reduce) {
  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .line-mask > span {
    transform: none;
    transition: none;
  }
}

/* ---------- Header ---------- */

.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 30;
  height: 3.9rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0 1.4rem;
  background: rgba(17, 18, 20, 0.82);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
  transition: transform 420ms var(--ease), opacity 420ms ease;
}

/*
 * Held off the screen over the homepage's opening frame, so the title page has it to
 * itself. /speaking never sets this — it is entered from a link, not as the front
 * door, and a header that has to be scrolled for is friction on an internal page.
 */
.site-header.is-hidden {
  transform: translateY(-100%);
  opacity: 0;
  pointer-events: none;
}

@media (prefers-reduced-motion: reduce) {
  .site-header {
    transition: none;
  }
}

.brand {
  display: flex;
  align-items: baseline;
  gap: 0.6rem;
  min-width: 0;
}

.masthead {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.02rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--chalk);
  text-decoration: none;
}

.masthead-dot {
  color: var(--accent-soft);
}

.header-meta {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-faint);
}

.site-nav {
  display: flex;
  gap: 1.3rem;
}

.site-nav a {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--ink-soft);
  text-decoration: none;
  padding: 0.3rem 0;
  border-bottom: 1px solid transparent;
}

.site-nav a:hover,
.site-nav a:focus-visible {
  color: var(--chalk);
  border-bottom-color: var(--accent);
}

/* The page you are on. A held rule, not a fill — the same grammar as hover. */
.site-nav a[aria-current="page"] {
  color: var(--chalk);
  border-bottom-color: var(--accent);
}

.nav-toggle {
  display: none;
  width: 2.4rem;
  height: 2.4rem;
  padding: 0;
  background: none;
  border: 1px solid var(--line);
  border-radius: 8px;
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  width: 1.05rem;
  height: 1.5px;
  margin: 0.22rem auto;
  background: var(--ink);
}

@media (max-width: 860px) {
  .header-meta {
    display: none;
  }

  .nav-toggle {
    display: block;
  }

  .site-nav {
    position: fixed;
    inset: 3.9rem 0 auto 0;
    flex-direction: column;
    gap: 0;
    padding: 0.6rem 1.4rem 1.2rem;
    background: rgba(17, 18, 20, 0.97);
    border-bottom: 1px solid var(--line);
    transform: translateY(-8px);
    opacity: 0;
    pointer-events: none;
    transition: opacity 220ms ease, transform 220ms ease;
  }

  .site-nav.is-open {
    transform: none;
    opacity: 1;
    pointer-events: auto;
  }

  .site-nav a {
    padding: 0.68rem 0;
    border-bottom: 1px solid var(--line);
  }
}

/* ---------- Opening type ---------- */

/*
 * The type of a title page, shared by both openings; the frames themselves are not —
 * the homepage's carries the shimmer and is a full viewport, /speaking's carries the
 * talk map and is shorter. Each page defines its own .opening.
 */

/* The announce link — a ruled row, not a pill. */
.announce {
  display: inline-flex;
  flex-wrap: wrap;
  max-width: 100%;
  align-items: baseline;
  gap: 0.4rem 0.9rem;
  padding: 0 0 0.7rem;
  margin-bottom: 2.6rem;
  text-decoration: none;
  border-bottom: 1px solid var(--line-strong);
  transition: border-color 220ms ease;
}

.announce:hover,
.announce:focus-visible {
  border-bottom-color: var(--accent);
}

.announce-tag {
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  font-weight: 500;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--accent-soft);
}

.announce-text {
  font-size: 0.92rem;
  color: var(--ink-soft);
}

.announce:hover .announce-text {
  color: var(--ink);
}

.announce-arrow {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--ink-faint);
  transition: transform 220ms var(--ease), color 220ms ease;
}

.announce:hover .announce-arrow {
  color: var(--accent-soft);
  transform: translateX(6px);
}

.opening-eyebrow {
  margin: 0 0 1.1rem;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--accent-soft);
}

/*
 * Mono 700 uppercase, masked lines. No serif italic on the last two words: a Fraunces
 * swash dropped into a sans headline is the flourish that made the previous two
 * versions of the homepage read as generated. Fraunces still runs both pages — just
 * only where it does real work, on the chapter titles and the index names.
 */
.opening-title {
  margin: 0;
  font-family: var(--font-mono);
  font-weight: 700;
  /*
   * The floor is lower than /f1's 1.9rem because these lines are set, not fitted:
   * "scientific rigour." is 18 monospaced characters and has to clear a 375px
   * viewport without breaking, which at 0.6em advance puts the cap at ~1.6rem.
   */
  font-size: clamp(1.6rem, 6.2vw, 4.1rem);
  line-height: 1.06;
  letter-spacing: 0.01em;
  text-transform: uppercase;
  color: var(--chalk);
}

/*
 * The lines rise in sequence rather than together. --d is inherited from the h1,
 * which the observer has already staggered against its siblings, so overriding it per
 * line reuses the same delay mechanism instead of hardcoding milliseconds.
 */
.opening-title .line-mask:nth-child(2) {
  --d: 2;
}

.opening-title .line-mask:nth-child(3) {
  --d: 3;
}

.opening-sub {
  margin: 1.6rem 0 0;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

.opening-lead {
  margin: 1.9rem 0 0;
  max-width: min(46ch, 100%);
  font-size: 1rem;
  line-height: 1.62;
  color: var(--ink-soft);
}

.opening-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1.1rem 2.2rem;
  margin-top: 2.6rem;
}

/*
 * The pages have no buttons. A call to action is a mono line with a rule under it,
 * the same treatment every other link gets — which is the point: nothing here needs a
 * filled capsule to be found.
 */
.cta {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink);
  text-decoration: none;
  padding-bottom: 0.45rem;
  border-bottom: 1px solid var(--line-strong);
  transition: color 220ms ease, border-color 220ms ease;
}

.cta:hover,
.cta:focus-visible {
  color: var(--chalk);
  border-bottom-color: var(--accent);
}

.cta-lead {
  color: var(--accent-soft);
  border-bottom-color: var(--accent);
}

.cta-lead:hover,
.cta-lead:focus-visible {
  color: var(--chalk);
}

/* ---------- The readout rail ---------- */

/*
 * A row of figures at the foot of an opening frame. On /speaking these count up on
 * arrival, which is why the value is tabular — a proportional figure set would change
 * width on every frame of the count and jitter the whole rail.
 */
.readout-rail {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  gap: 1.6rem 2.4rem;
}

.readout {
  min-width: 0;
}

.readout-value {
  display: block;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(1.15rem, 2.6vw, 1.85rem);
  letter-spacing: -0.01em;
  color: var(--chalk);
  font-variant-numeric: tabular-nums;
}

.readout-label {
  display: block;
  margin-top: 0.28rem;
  font-family: var(--font-mono);
  font-size: 0.6rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--ink-faint);
}

.readout-lead .readout-value {
  color: var(--accent-soft);
}

@media (max-width: 700px) {
  /*
   * Tracking is what makes this line expensive: 0.16em on 47 monospaced characters
   * adds most of a phone's width on its own. It comes off before the size does.
   */
  .opening-sub {
    font-size: 0.66rem;
    letter-spacing: 0.1em;
  }

  .readout-rail {
    gap: 1rem 1.5rem;
  }
}

/* ---------- Chapters ---------- */

/*
 * Everything below an opening frame is one continuous coal ground. There is no
 * alternating band and no panel fill: sections are separated by a hairline and a lot
 * of vertical space, which is what stops a page reading as a stack of identical cards.
 */
.chapter {
  padding: clamp(6rem, 14vh, 11rem) 0;
  border-top: 1px solid var(--line);
}

.chapter-head {
  display: grid;
  grid-template-columns: minmax(0, var(--margin-col)) minmax(0, 1fr);
  gap: 0 clamp(1.5rem, 4vw, 3.5rem);
  margin-bottom: clamp(3rem, 7vw, 5.5rem);
}

/* The chapter number sits alone in the margin column, aligned to the title's cap. */
.chapter-index {
  margin: 0;
  padding-top: 0.7em;
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--ink-faint);
}

.chapter-index b {
  font-weight: 500;
  color: var(--accent-soft);
}

.chapter-title {
  grid-column: 2;
  margin: 0;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: var(--fs-chapter);
  line-height: 0.98;
  letter-spacing: -0.035em;
  color: var(--chalk);
}

.chapter-lead {
  grid-column: 2;
  margin: 1.6rem 0 0;
  max-width: min(46ch, 100%);
  font-size: 1rem;
  line-height: 1.62;
  color: var(--ink-soft);
}

@media (max-width: 860px) {
  .chapter-head {
    grid-template-columns: 1fr;
  }

  .chapter-index {
    padding-top: 0;
    margin-bottom: 1.1rem;
  }

  .chapter-title,
  .chapter-lead {
    grid-column: 1;
  }
}

/* ---------- Hanging list ---------- */

/*
 * The workhorse: a mono label alone in the margin column, prose beside it, hairline
 * between. It sets the capabilities and contact details on the homepage and the
 * awards on /speaking, and it is the same grid the chapter heads open on — which is
 * what makes the margin column read as a spine running the length of a page rather
 * than as indentation.
 */
.hang-list {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.hang-row {
  display: grid;
  grid-template-columns: minmax(0, var(--margin-col)) minmax(0, 1fr);
  gap: 0 clamp(1.5rem, 4vw, 3.5rem);
  padding: 1.3rem 0;
  border-bottom: 1px solid var(--line);
  font-size: 0.94rem;
  line-height: 1.6;
  color: var(--ink-soft);
}

.hang-label {
  padding-top: 0.25em;
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-faint);
}

/*
 * A single letter at micro size disappears into the ground — a word like "Location"
 * has enough mass to hold the column on its own, one glyph does not. The capability
 * keys get the chapter number's treatment instead, so the spine still reads.
 */
.hang-label-key {
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.2em;
  color: var(--accent-soft);
}

.hang-row p {
  margin: 0;
  max-width: min(62ch, 100%);
}

.hang-row a {
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid var(--line-strong);
  transition: color 220ms ease, border-color 220ms ease;
}

.hang-row a:hover,
.hang-row a:focus-visible {
  color: var(--chalk);
  border-bottom-color: var(--accent);
}

/* A prose block on the same grid, without the rules. */
.hang-prose {
  display: grid;
  grid-template-columns: minmax(0, var(--margin-col)) minmax(0, 1fr);
  gap: 0 clamp(1.5rem, 4vw, 3.5rem);
  margin: 0 0 clamp(3rem, 6vw, 4.5rem);
}

.hang-prose-body {
  max-width: min(62ch, 100%);
}

.hang-prose-body p {
  margin: 0 0 1.2rem;
  font-size: 1rem;
  line-height: 1.68;
  color: var(--ink-soft);
}

.hang-prose-body p:last-child {
  margin-bottom: 0;
}

.hang-prose-body strong {
  font-weight: 500;
  color: var(--ink);
}

/* A row of mono wordmarks — the site's links elsewhere, set as text, not as icons. */
.wordmarks {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem 1.6rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.wordmarks a {
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-soft);
  text-decoration: none;
  padding-bottom: 0.3rem;
  border-bottom: 1px solid var(--line-strong);
  transition: color 220ms ease, border-color 220ms ease;
}

.wordmarks a:hover,
.wordmarks a:focus-visible {
  color: var(--chalk);
  border-bottom-color: var(--accent);
}

@media (max-width: 860px) {
  .hang-row,
  .hang-prose {
    grid-template-columns: 1fr;
  }

  .hang-label {
    margin-bottom: 0.5rem;
    padding-top: 0;
  }
}

/* ---------- The index ---------- */

/*
 * Ruled rows, not cards. The number and tag hang in the margin column, the name is
 * set at figure size, and the whole row is the link. Hover is a wash rather than a
 * fill and there is no border-radius on it, so a row never detaches from the page and
 * becomes a tile.
 */
.index-list {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line-strong);
}

.index-row {
  display: grid;
  grid-template-columns: minmax(0, var(--margin-col)) minmax(0, 1fr) auto;
  gap: 0 clamp(1.5rem, 4vw, 3.5rem);
  padding: 2rem 0;
  border-bottom: 1px solid var(--line);
  text-decoration: none;
  transition: background-color 220ms ease;
}

.index-row:hover,
.index-row:focus-visible {
  background: rgba(var(--accent-rgb), 0.07);
}

.index-row:focus-visible {
  outline: 1px solid var(--accent-soft);
  outline-offset: -1px;
}

/*
 * A row is often one anchor, so everything inside it is a span for validity and has
 * to be given its box back here.
 */
.index-meta,
.index-body {
  display: block;
  min-width: 0;
}

.index-meta {
  padding-top: 0.4em;
}

.index-num {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  font-weight: 500;
  letter-spacing: 0.2em;
  color: var(--accent-soft);
  font-variant-numeric: tabular-nums;
}

.index-tag {
  display: block;
  margin-top: 0.6rem;
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-faint);
}

.index-name {
  display: block;
  margin: 0;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(1.9rem, 4.4vw, 3.2rem);
  line-height: 1;
  letter-spacing: -0.035em;
  color: var(--chalk);
  transition: color 220ms ease;
}

.index-row:hover .index-name,
.index-row:focus-visible .index-name {
  color: var(--accent-soft);
}

.index-note {
  display: block;
  margin: 1rem 0 0;
  max-width: min(52ch, 100%);
  font-size: 0.94rem;
  line-height: 1.55;
  color: var(--ink-soft);
}

.index-go {
  align-self: center;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--ink-faint);
  transition: transform 220ms var(--ease), color 220ms ease;
}

.index-row:hover .index-go,
.index-row:focus-visible .index-go {
  color: var(--accent);
  transform: translateX(6px);
}

@media (max-width: 860px) {
  .index-row {
    grid-template-columns: minmax(0, 1fr) auto;
  }

  .index-meta {
    grid-column: 1 / -1;
    display: flex;
    align-items: baseline;
    gap: 1.1rem;
    padding-top: 0;
    margin-bottom: 0.9rem;
  }

  .index-tag {
    margin-top: 0;
  }
}

/* ---------- Footer ---------- */

.site-footer {
  padding: 3rem 0 4rem;
  border-top: 1px solid var(--line);
}

.site-footer p {
  margin: 0 0 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.08em;
  color: var(--ink-faint);
}

.site-footer a {
  color: var(--ink-soft);
  text-decoration: none;
  border-bottom: 1px solid var(--line-strong);
  transition: color 220ms ease, border-color 220ms ease;
}

.site-footer a:hover,
.site-footer a:focus-visible {
  color: var(--chalk);
  border-bottom-color: var(--accent);
}