/* ==========================================================================
   Linux, 1991–2026 — feuille de style unique, sans dépendance externe
   Thème clair. Contrastes vérifiés (voir VERIFICATION.md).
   ========================================================================== */

:root {
  --paper: #faf8f3;
  --surface: #ffffff;
  --surface-2: #f2eee4;
  --ink: #1b1b18;
  --ink-soft: #3a3934;
  --muted: #54534c;
  --line: #d9d3c6;
  --line-strong: #b9b2a2;
  --accent: #8a2338;
  --accent-dark: #6d1a2a;
  --accent-soft: #f4e7e8;
  --focus: #1f5f8b;

  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, "Book Antiqua",
           Georgia, "Times New Roman", serif;
  --sans: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto,
          "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas,
          "Liberation Mono", monospace;

  --measure: 68ch;
  --pad: clamp(1.15rem, 4vw, 2.5rem);
}

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

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 1.0625rem;
  line-height: 1.65;
  font-kerning: normal;
  text-rendering: optimizeLegibility;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
}

.wrap {
  width: 100%;
  max-width: 1080px;
  margin-inline: auto;
  padding-inline: var(--pad);
}

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

.skip {
  position: absolute;
  left: 1rem;
  top: -100px;
  z-index: 100;
  background: var(--ink);
  color: #fff;
  padding: .7rem 1rem;
  border-radius: 2px;
  text-decoration: none;
}
.skip:focus { top: 1rem; }

a {
  color: var(--accent);
  text-decoration-thickness: .06em;
  text-underline-offset: .18em;
}
a:hover { color: var(--accent-dark); text-decoration-thickness: .12em; }
a:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 3px;
  border-radius: 2px;
}

code {
  font-family: var(--mono);
  font-size: .88em;
  background: var(--surface-2);
  padding: .08em .32em;
  border-radius: 3px;
  overflow-wrap: anywhere;
  word-break: break-word;
}

sup { font-size: .68em; line-height: 0; }

/* ---------- Hero ---------- */

.hero {
  padding: clamp(2.6rem, 7vw, 5rem) 0 clamp(2rem, 4vw, 3rem);
  background:
    radial-gradient(1200px 380px at 78% -80px, #f0e7d8 0%, transparent 70%),
    var(--paper);
  border-bottom: 1px solid var(--line);
}

.hero-top {
  display: flex;
  align-items: center;
  gap: .9rem;
  margin-bottom: clamp(1.6rem, 4vw, 2.8rem);
}

.mark {
  display: inline-grid;
  grid-template-rows: repeat(3, 1fr);
  gap: 4px;
  width: 40px; height: 40px;
  padding: 8px;
  border: 2px solid var(--ink);
  border-radius: 2px;
  flex: none;
}
.mark i { display: block; background: var(--ink); }
.mark i:nth-child(1) { width: 55%; }
.mark i:nth-child(2) { width: 100%; }
.mark i:nth-child(3) { width: 78%; background: var(--accent); }

.kicker {
  margin: 0;
  font-size: .78rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--muted);
  font-weight: 600;
}

h1 {
  margin: 0 0 1.2rem;
  font-family: var(--serif);
  font-weight: 600;
  font-size: clamp(2.5rem, 7.2vw, 5rem);
  line-height: .98;
  letter-spacing: -.025em;
  text-wrap: balance;
}

.lede {
  max-width: 54ch;
  margin: 0 0 clamp(2rem, 5vw, 3.2rem);
  font-family: var(--serif);
  font-size: clamp(1.15rem, 2.2vw, 1.45rem);
  line-height: 1.45;
  color: var(--ink-soft);
}

.anniv {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: clamp(1.2rem, 4vw, 2.6rem);
  align-items: center;
  max-width: 860px;
  padding: clamp(1.2rem, 3vw, 1.9rem) clamp(1.2rem, 3vw, 2rem);
  background: var(--surface);
  border: 1px solid var(--line);
  border-left: 6px solid var(--accent);
  border-radius: 3px;
}

.anniv-num {
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(3.6rem, 9vw, 5.4rem);
  line-height: .8;
  letter-spacing: -.04em;
  color: var(--accent);
  display: flex;
  align-items: baseline;
  gap: .25rem;
}
.anniv-num span {
  font-family: var(--sans);
  font-size: .95rem;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--muted);
}

.anniv h2 {
  margin: 0 0 .35rem;
  font-size: .8rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--muted);
  font-weight: 600;
}
.anniv p { margin: 0; max-width: 58ch; font-size: .97rem; }

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 1.2rem 3rem;
  margin: clamp(1.8rem, 4vw, 2.6rem) 0 0;
  padding-top: 1.3rem;
  border-top: 1px solid var(--line);
  font-size: .85rem;
}
.hero-meta div { display: flex; flex-direction: column; gap: .1rem; }
.hero-meta dt {
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: .1em;
  font-size: .7rem;
  font-weight: 600;
}
.hero-meta dd { margin: 0; font-weight: 600; }
.hero-meta dd span { font-weight: 400; color: var(--muted); }

/* ---------- Navigation des époques ---------- */

.eranav {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(250, 248, 243, .96);
  backdrop-filter: saturate(1.2) blur(6px);
  border-bottom: 1px solid var(--line);
}

.eranav ul {
  display: flex;
  gap: .15rem;
  list-style: none;
  margin: 0;
  padding: 0;
  overflow-x: auto;
  scrollbar-width: thin;
}

.eranav a {
  display: block;
  padding: .85rem .7rem;
  color: var(--ink-soft);
  text-decoration: none;
  font-size: .82rem;
  font-weight: 500;
  white-space: nowrap;
  border-bottom: 2px solid transparent;
}
.eranav a span {
  font-variant-numeric: tabular-nums;
  color: var(--muted);
  font-size: .72rem;
  margin-right: .3rem;
}
.eranav a:hover { color: var(--accent); }
.eranav a[aria-current="true"] {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

/* ---------- Intro ---------- */

.intro { padding-top: clamp(2.2rem, 5vw, 3.4rem); }

.chapeau {
  max-width: var(--measure);
  margin: 0;
  font-size: 1.02rem;
  color: var(--ink-soft);
}

.ref {
  font-size: .74em;
  text-decoration: none;
  color: var(--accent);
  padding: 0 .1em;
}
.ref:hover { text-decoration: underline; }

.flag {
  display: inline-block;
  font-family: var(--sans);
  font-size: .68rem;
  letter-spacing: .06em;
  text-transform: uppercase;
  font-weight: 700;
  color: var(--accent-dark);
  background: var(--accent-soft);
  border: 1px solid #e3c9cb;
  border-radius: 2px;
  padding: .05rem .38rem;
  vertical-align: .08em;
  white-space: nowrap;
}

/* ---------- Époques ---------- */

.era { padding: clamp(2.6rem, 6vw, 4rem) 0 0; }
.era + .era { margin-top: clamp(.5rem, 2vw, 1rem); }

.era-head {
  display: grid;
  grid-template-columns: 4.2rem 1fr;
  gap: 1rem;
  padding-top: 1.1rem;
  border-top: 2px solid var(--ink);
  margin-bottom: clamp(1.6rem, 4vw, 2.4rem);
}

.era-num {
  margin: 0;
  font-family: var(--serif);
  font-size: 2.1rem;
  line-height: 1;
  color: var(--accent);
  font-variant-numeric: tabular-nums;
}

.era-dates {
  margin: 0 0 .25rem;
  font-size: .76rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--muted);
  font-weight: 600;
}

.era-head h2 {
  margin: 0 0 .5rem;
  font-family: var(--serif);
  font-size: clamp(1.6rem, 3.8vw, 2.35rem);
  line-height: 1.12;
  font-weight: 600;
  letter-spacing: -.015em;
  text-wrap: balance;
}

.era-intro {
  margin: 0;
  max-width: 62ch;
  color: var(--ink-soft);
  font-size: .98rem;
}

/* ---------- Frise ---------- */

.timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.timeline::before {
  content: "";
  position: absolute;
  left: 160px;
  top: .55rem;
  bottom: 1.2rem;
  width: 1px;
  background: var(--line-strong);
}

.event {
  display: grid;
  grid-template-columns: 160px minmax(0, 1fr);
  position: relative;
  padding-bottom: 2.1rem;
}
.event:last-child { padding-bottom: .4rem; }

.when {
  padding-right: 1.5rem;
  padding-top: .05rem;
  text-align: right;
  font-size: .8rem;
  line-height: 1.35;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
  font-weight: 600;
}
.when time { display: block; }

.what {
  position: relative;
  padding-left: 1.9rem;
  padding-bottom: .2rem;
}
.what::before {
  content: "";
  position: absolute;
  left: -4px;
  top: .52rem;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--paper);
  border: 2px solid var(--line-strong);
}
.event.is-key .what::before {
  background: var(--accent);
  border-color: var(--accent);
  box-shadow: 0 0 0 4px var(--accent-soft);
}

.what h3 {
  margin: 0 0 .35rem;
  font-family: var(--serif);
  font-size: clamp(1.12rem, 2.4vw, 1.32rem);
  line-height: 1.28;
  font-weight: 600;
  letter-spacing: -.008em;
}

.what p { margin: 0 0 .45rem; max-width: var(--measure); }
.what p:last-child { margin-bottom: 0; }

.src {
  font-size: .8rem;
  color: var(--muted);
}
.src a { color: var(--accent); }

.note {
  font-size: .86rem;
  color: var(--ink-soft);
  background: var(--surface-2);
  border-left: 2px solid var(--line-strong);
  padding: .5rem .7rem;
  margin-top: .55rem !important;
  max-width: 62ch;
}

/* ---------- Aujourd'hui ---------- */

.today {
  margin-top: clamp(3rem, 8vw, 5rem);
  padding: clamp(2.6rem, 6vw, 4rem) 0 clamp(2rem, 5vw, 3rem);
  background: var(--surface);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.stat {
  background: var(--surface);
  padding: clamp(1.2rem, 3vw, 1.7rem);
  display: flex;
  flex-direction: column;
  gap: .25rem;
}

.stat-num {
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(2.4rem, 5vw, 3.1rem);
  line-height: 1;
  letter-spacing: -.03em;
  color: var(--accent);
  font-variant-numeric: tabular-nums;
}
.stat-num span {
  font-size: .5em;
  letter-spacing: 0;
  color: var(--muted);
}

.stat h3 {
  margin: .15rem 0 .4rem;
  font-size: .84rem;
  letter-spacing: .1em;
  text-transform: uppercase;
  font-weight: 700;
  color: var(--ink);
}

.stat p { margin: 0; font-size: .92rem; max-width: 40ch; }

.stat .src {
  margin-top: auto;
  padding-top: .9rem;
  font-size: .76rem;
  color: var(--muted);
}

.stat-quiet .stat-num { color: var(--ink-soft); }

.caveat {
  margin-top: clamp(2rem, 4vw, 2.8rem);
  padding: clamp(1.2rem, 3vw, 1.7rem);
  border: 1px solid var(--line);
  background: var(--paper);
  max-width: 900px;
}
.caveat h3 {
  margin: 0 0 .6rem;
  font-size: .8rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--muted);
}
.caveat ul { margin: 0; padding-left: 1.1rem; }
.caveat li { margin-bottom: .45rem; font-size: .92rem; }
.caveat li:last-child { margin-bottom: 0; }

/* ---------- Points discutés ---------- */

.disputes { padding: clamp(2.8rem, 6vw, 4rem) var(--pad) 0; max-width: 1080px; }

.disputes h2 {
  margin: 0 0 .5rem;
  font-family: var(--serif);
  font-size: clamp(1.7rem, 3.6vw, 2.2rem);
  font-weight: 600;
  letter-spacing: -.015em;
}

.section-lede {
  max-width: 64ch;
  margin: 0 0 1.6rem;
  color: var(--ink-soft);
}

.table-scroll {
  overflow-x: auto;
  border: 1px solid var(--line);
  background: var(--surface);
}

table {
  border-collapse: collapse;
  width: 100%;
  min-width: 640px;
  font-size: .9rem;
}
th, td {
  text-align: left;
  vertical-align: top;
  padding: .75rem .9rem;
  border-bottom: 1px solid var(--line);
}
thead th {
  background: var(--surface-2);
  font-size: .74rem;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--muted);
}
tbody tr:last-child td { border-bottom: 0; }
tbody th { font-weight: 600; }

/* ---------- Sources ---------- */

.sources { padding: clamp(3rem, 7vw, 4.5rem) 0 0; }

.srclist {
  list-style: none;
  margin: 0;
  padding: 0;
  max-width: 900px;
  font-size: .9rem;
}

.srclist li {
  position: relative;
  padding: .7rem 0 .7rem 2.6rem;
  border-bottom: 1px solid var(--line);
  color: var(--ink-soft);
  overflow-wrap: anywhere;
  line-height: 1.55;
}

.srclist .n {
  position: absolute;
  left: 0;
  top: .78rem;
  color: var(--accent);
  font-variant-numeric: tabular-nums;
  font-weight: 600;
  font-size: .82rem;
}

.srclist cite { font-style: normal; font-weight: 600; color: var(--ink); }
.srclist a { font-size: .84rem; }

.srclist-note {
  max-width: 760px;
  margin: 1.3rem 0 0;
  font-size: .84rem;
  color: var(--muted);
}

/* ---------- Pied ---------- */

.foot {
  margin-top: clamp(3rem, 7vw, 4.5rem);
  padding: 1.8rem 0 2.6rem;
  border-top: 1px solid var(--line);
  font-size: .84rem;
  color: var(--muted);
}
.foot p { margin: 0 0 .35rem; }

/* ---------- Mobile ---------- */

@media (max-width: 760px) {
  body { font-size: 1rem; }

  .wrap { padding-inline: 1.15rem; }

  .hero { padding-top: 2.2rem; }

  .anniv {
    grid-template-columns: 1fr;
    gap: .8rem;
  }
  .anniv-num { font-size: 3.4rem; }

  .hero-meta { gap: .9rem 1.6rem; }
  .hero-meta div { min-width: 40%; }

  .eranav ul { padding-inline: .35rem; }
  .eranav a { padding: .8rem .55rem; font-size: .78rem; }

  .era-head { grid-template-columns: 2.4rem 1fr; gap: .7rem; }
  .era-num { font-size: 1.5rem; }

  .timeline::before { left: 5px; }

  .event {
    grid-template-columns: minmax(0, 1fr);
    padding-bottom: 1.8rem;
  }

  .what { min-width: 0; }

  .when {
    text-align: left;
    padding: 0 0 .3rem 1.9rem;
    font-size: .75rem;
    letter-spacing: .03em;
    text-transform: uppercase;
    color: var(--accent);
  }

  .what { padding-left: 1.9rem; }
  .what::before { left: 1px; top: .45rem; }

  .what h3 { font-size: 1.12rem; }

  .disputes { padding-inline: 1.15rem; }
}

@media (max-width: 400px) {
  .hero-meta { display: grid; grid-template-columns: 1fr; }
  .stat-num { font-size: 2.5rem; }
}

/* ---------- Impression ---------- */

@media print {
  .eranav, .skip, .foot a { display: none; }
  body { background: #fff; font-size: 10.5pt; }
  .hero { border: 0; }
  .era, .event { break-inside: avoid; }
  a { color: #000; text-decoration: none; }
  .srclist a::after { content: " (" attr(href) ")"; font-size: 8pt; word-break: break-all; }
}