/* Feuille de style commune à toutes les pages "matière" (Maths/Physique/Chimie/SI)
   du site PCSI de Clarisse — Cours / DS / Exercices — ainsi qu'à l'accueil et aux
   ressources. Toute page qui l'inclut doit rester cohérente : modifier ici plutôt
   que de dupliquer des styles dans un <style> local. */

:root {
  --bg: #f2f2f7;
  --card-bg: #ffffff;
  --text: #1c1c1e;
  --sub: #6e6e73;
  --accent: #0a63d3;
  --accent-2: #0a8a4a;
  --border: #e2e2e7;
  --prio-bg: #fff6df;
  --prio-border: #f0c14b;
  --section-bg: #dfe8f7;
  --section-text: #1F4E78;
  --row-alt: #fafafc;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #000000;
    --card-bg: #1c1c1e;
    --text: #f5f5f7;
    --sub: #9a9a9e;
    --accent: #4da3ff;
    --accent-2: #4fd97a;
    --border: #2c2c2e;
    --prio-bg: #2a2410;
    --prio-border: #b8912e;
    --section-bg: #16344f;
    --section-text: #bcd6f2;
    --row-alt: #232325;
  }
}
* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }
html, body {
  margin: 0; padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, sans-serif;
  -webkit-font-smoothing: antialiased;
}
html { scroll-behavior: smooth; }

header { padding: max(env(safe-area-inset-top, 14px), 14px) 16px 6px 16px; text-align: center; }
.crosslinks { display:flex; justify-content:center; align-items:center; gap:14px; margin-bottom:10px; flex-wrap:wrap; }
.crosslinks a { display:inline-flex; align-items:center; gap:4px; font-size:13px; font-weight:600; color:var(--accent); text-decoration:none; }
.crosslinks img { height:16px; width:auto; border-radius:3px; vertical-align:middle; }
header h1 { font-size: 22px; margin: 4px 0 2px 0; font-weight: 800; }
header p { margin: 0; color: var(--sub); font-size: 14.5px; }

:root { --tabbar-h: 52px; --switch-h: 38px; }

/* Sélecteur de matière : navigation principale, tout en haut, reste
   visible pendant tout le défilement de la page matière. */
nav.subject-switch {
  position: sticky; top: 0; z-index: 21;
  display: flex; gap: 4px; overflow-x: auto; align-items: center;
  height: var(--switch-h); box-sizing: border-box;
  max-width: 760px; margin: 10px auto 0;
  padding: 0 8px; background: var(--bg);
  -webkit-overflow-scrolling: touch;
}

/* Barre d'onglets Cours / Exercices / DS : ancres de défilement dans la même
   page (voir assets/pcsi.js pour la mise en surbrillance de l'onglet visible),
   juste sous le sélecteur de matière, reste sticky elle aussi. */
nav.tab-bar {
  position: sticky; top: var(--switch-h); z-index: 20;
  display: flex; gap: 6px; align-items: center;
  height: var(--tabbar-h); box-sizing: border-box;
  max-width: 760px; margin: 0 auto;
  padding: 6px 8px;
  background: var(--bg);
}
nav.tab-bar a {
  flex: 1 1 0; border-radius: 14px;
  padding: 9px 6px; font-size: 15.5px; font-weight: 700;
  background: var(--card-bg); color: var(--sub);
  text-decoration: none; white-space: nowrap; text-align: center;
  border: 1px solid var(--border);
}
nav.tab-bar a.active { background: var(--accent); color: #fff; border-color: var(--accent); }
nav.subject-switch a {
  flex: 1 1 0; border-radius: 12px;
  padding: 6px 4px; font-size: 13.5px; font-weight: 600;
  background: transparent; color: var(--sub);
  text-decoration: none; white-space: nowrap; text-align: center;
  border: 1px solid transparent;
}
nav.subject-switch a.active { color: var(--accent); border-color: var(--border); background: var(--card-bg); }

main { padding: 10px 8px 40px 8px; max-width: 760px; margin: 0 auto; }

main > section { scroll-margin-top: calc(var(--tabbar-h) + var(--switch-h) + 8px); }
.section-title {
  font-size: 19px; font-weight: 800; margin: 22px 4px 10px 4px;
  padding-top: 14px; border-top: 1px solid var(--border);
}
main > section:first-child .section-title { border-top: none; margin-top: 6px; padding-top: 0; }

.manual-line { display: flex; flex-wrap: wrap; gap: 6px; margin: 2px 4px 12px 4px; }
.manual-chip {
  display: inline-flex; align-items: center; gap: 3px;
  background: rgba(10,138,74,0.10); border: 1px solid var(--border);
  padding: 3px 8px; border-radius: 10px;
  color: var(--accent-2); font-weight: 600; text-decoration: none; font-size: 12.5px;
}
.manual-chip .arrow { opacity: .6; }
.manual-chip.video-chip { background: rgba(214,40,40,0.08); color: #d62828; }

.source-chip-inline {
  display: inline-flex; align-items: center; gap: 4px;
  background: var(--card-bg); border: 1px solid var(--border);
  padding: 3px 9px; border-radius: 12px; margin-left: 4px;
  color: var(--accent); font-weight: 600; text-decoration: none;
  font-size: 13px; text-transform: none; letter-spacing: normal;
}
.source-chip-inline.source-chip-static { color: var(--section-text); }
.source-chip-inline .arrow { opacity: .6; }
.source-icon { height:13px; width:auto; border-radius:2px; vertical-align:middle; }
.source-pin { opacity: .7; font-weight: 500; }

.source-chip {
  display: inline-flex; align-items: center; gap: 4px;
  background: var(--card-bg); border: 1px solid var(--border);
  padding: 5px 10px; border-radius: 14px;
  color: var(--accent); font-weight: 600; text-decoration: none; font-size: 14px;
}
.source-chip .arrow { opacity: .6; }
.source-chip img { height: 14px; width: 14px; border-radius: 3px; vertical-align: middle; }
.section-row .source-chip { text-transform: none; font-size: 13px; padding: 2px 8px; }
.section-row td { overflow: hidden; overflow-wrap: anywhere; word-break: break-word; }

table {
  width: 100%; table-layout: auto; border-collapse: collapse;
  background: var(--card-bg); border-radius: 12px;
  overflow: hidden; font-size: 14.5px; line-height: 1.24;
  border: 1px solid var(--border);
}
thead th {
  background: #1F4E78; color: #fff;
  font-size: 13px; text-transform: uppercase; letter-spacing: .03em;
  padding: 5px 6px; text-align: left; font-weight: 700;
}
tbody tr:nth-child(even):not(.section-row) { background: var(--row-alt); }
tbody tr:not(.section-row) { border-top: 1px solid var(--border); }
tbody tr.prio { background: var(--prio-bg) !important; }
tbody tr.prio td.col-titre { font-weight: 700; color: #8a5a00; }
td { padding: 4px 6px; vertical-align: middle; }
.section-row td {
  background: var(--section-bg); color: var(--section-text);
  font-weight: 700; font-size: 13.5px; text-transform: uppercase;
  letter-spacing: .02em; padding: 4.5px 8px;
}
.col-n { width: 1%; white-space: nowrap; color: var(--sub); font-size: 10px; letter-spacing: 0; }
td.col-n { font-size: 10px; }
th.col-n { font-size: 10px; letter-spacing: 0; }
th.col-n, td.col-n { padding-left: 4px; padding-right: 0; }
.col-titre { overflow-wrap: anywhere; word-break: break-word; padding-left: 3px; }
/* Colonnes N° et Lien : largeur = contenu (1% + nowrap), tout le reste va à l'intitulé. */
.col-link { width: 1%; white-space: nowrap; text-align: right; padding-right: 6px; }
.empty-cell { color: var(--sub); font-size: 14.5px; font-style: italic; text-align: center; }

.pill { display: inline-block; font-size: 13px; font-weight: 700; text-decoration: none; padding: 3px 7px; border-radius: 8px; white-space: nowrap; margin: 2px; }
.col-link .pill:last-child { margin-right: 0; }
.pill-sujet { background: rgba(10,99,211,0.12); color: var(--accent); }
.pill-corrige { background: rgba(10,138,74,0.12); color: var(--accent-2); }
.pill-pdf { background: rgba(214,40,40,0.12); color:#d62828; }
.pill-off { color: var(--sub); font-size: 14px; }

.empty-sub { color: var(--sub); font-size: 14.5px; line-height: 1.5; }
.empty-sub a { color: var(--accent); font-weight: 600; text-decoration: none; }

.placeholder { text-align: center; padding: 60px 20px; }
.placeholder .placeholder-icon { font-size: 41px; margin-bottom: 10px; }
.placeholder .placeholder-title { font-size: 19px; font-weight: 700; margin-bottom: 6px; }
.placeholder .placeholder-sub { font-size: 15px; color: var(--sub); line-height: 1.5; max-width: 420px; margin: 0 auto; }

footer { text-align: center; padding: 16px; color: var(--sub); font-size: 12.5px; }

@media (max-width: 420px) {
  table { font-size: 13.5px; }
  nav.tab-bar a { font-size: 14px; padding: 8px 4px; }
  nav.subject-switch a { font-size: 12.5px; }
  .manual-chip { font-size: 11.5px; padding: 3px 6px; }
}