:root {
  --bg: #f6f7f8;
  --surface: #ffffff;
  --surface-2: #eef0f2;
  --ink: #1d2125;
  --ink-soft: #5c646c;
  --line: #e1e4e8;
  --green: #2b7a3d;
  --green-soft: #e3f1e6;
  --past: #8a939c;
  --up: #c0392b;
  --up-bg: #fbe9e7;
  --down: #1c6fb8;
  --down-bg: #e5f0fa;
  --flat-bg: #eef0f2;
  --radius: 14px;
  --shadow: 0 1px 2px rgba(20, 24, 28, .05), 0 4px 16px rgba(20, 24, 28, .04);
  --serif: "Fraunces", Georgia, serif;
  --sans: "Inter", system-ui, -apple-system, "Segoe UI", sans-serif;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111315;
    --surface: #1a1d20;
    --surface-2: #23272b;
    --ink: #e9ecef;
    --ink-soft: #9aa2aa;
    --line: #2e3338;
    --green: #69c67e;
    --green-soft: #1d3324;
    --past: #6c757d;
    --up: #ff8a80;
    --up-bg: #3a1f1e;
    --down: #74b9f5;
    --down-bg: #1a2c3d;
    --flat-bg: #2a2e33;
    --shadow: none;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: 80px; }

/* Pied de page toujours en bas de l'écran, même quand la page est courte */
body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  min-height: 100dvh;
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.55 var(--sans);
  -webkit-font-smoothing: antialiased;
}

a { color: var(--green); }

h1, h2, h3 { font-family: var(--serif); line-height: 1.15; margin: 0; font-weight: 700; }
h1 { font-size: clamp(1.7rem, 4vw, 2.6rem); }
h2 { font-size: clamp(1.4rem, 3vw, 1.9rem); }
h3 { font-size: 1.1rem; font-weight: 600; }

.wrap { max-width: 1160px; margin: 0 auto; padding: 0 16px; }
.section { padding: 48px 16px 8px; }
.section-head { margin-bottom: 24px; max-width: 760px; }
.lead { color: var(--ink-soft); margin: 10px 0 0; font-size: 1.05rem; }
.muted { color: var(--ink-soft); }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }

/* En-tête ---------------------------------------------------------------- */
.site-header {
  position: sticky; top: 0; z-index: 10;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding-top: 10px; padding-bottom: 10px; }
.brand { display: flex; align-items: center; gap: 12px; text-decoration: none; color: inherit; }
.brand img { border-radius: 10px; }
.brand-name { display: block; font-family: var(--serif); font-weight: 700; font-size: 1.25rem; line-height: 1.1; }
.brand-tag { display: block; font-size: .8rem; color: var(--ink-soft); }
.nav { display: flex; gap: 4px; flex-wrap: wrap; }
.nav a { text-decoration: none; color: var(--ink-soft); font-size: .92rem; padding: 6px 10px; border-radius: 8px; }
.nav a:hover { background: var(--surface-2); color: var(--ink); }
.nav a[aria-current="page"] { background: var(--green-soft); color: var(--green); font-weight: 600; }
@media (max-width: 820px) {
  .header-inner { flex-wrap: wrap; gap: 8px; }
  .nav { width: 100%; flex-wrap: nowrap; overflow-x: auto; scrollbar-width: none; margin: 0 -4px; }
  .nav a { white-space: nowrap; padding: 6px 7px; font-size: .84rem; }
  .brand-tag { display: none; }
}

/* Cartes de la semaine ----------------------------------------------------- */
.cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 14px; }
.card {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
  box-shadow: var(--shadow); padding: 18px 18px 14px; text-align: left; font: inherit; color: inherit;
  cursor: pointer; display: flex; flex-direction: column; gap: 6px; text-decoration: none;
  transition: border-color .15s, transform .15s;
}
.card:hover { border-color: var(--green); transform: translateY(-2px); }
.card:focus-visible { outline: 3px solid var(--green); outline-offset: 2px; }
.card-top { display: flex; justify-content: space-between; align-items: center; gap: 8px; }
.tag {
  font-size: .72rem; font-weight: 600; letter-spacing: .04em; text-transform: uppercase;
  color: var(--green); background: var(--green-soft); padding: 3px 8px; border-radius: 99px;
}
.card-period { font-size: .78rem; color: var(--ink-soft); }
.card-title { font-weight: 600; font-size: .98rem; line-height: 1.3; }
@media (min-width: 560px) { .card-title { min-height: 2.6em; } }
.card-price { font-family: var(--serif); font-size: 2.1rem; font-weight: 700; line-height: 1; margin-top: 4px; }
.card-price small { font-family: var(--sans); font-size: .82rem; font-weight: 500; color: var(--ink-soft); margin-left: 4px; }
.card-foot { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; }
.card.stale { opacity: .78; }
.card-note { font-size: .78rem; color: var(--ink-soft); }
.spark { display: block; width: 100%; height: 38px; margin: 6px 0 4px; overflow: visible; }

.delta { display: inline-flex; align-items: center; gap: 4px; font-size: .85rem; font-weight: 600; padding: 2px 8px; border-radius: 99px; white-space: nowrap; }
.delta.up { color: var(--up); background: var(--up-bg); }
.delta.down { color: var(--down); background: var(--down-bg); }
.delta.flat { color: var(--ink-soft); background: var(--flat-bg); }

/* Panneaux ---------------------------------------------------------------- */
.panel { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); padding: 18px; }
.controls { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; margin-bottom: 16px; }
.select select {
  font: inherit; font-weight: 600; color: var(--ink); background: var(--surface-2);
  border: 1px solid var(--line); border-radius: 10px; padding: 8px 12px; max-width: 100%;
}
.seg { display: inline-flex; background: var(--surface-2); border: 1px solid var(--line); border-radius: 10px; padding: 3px; }
.seg button {
  font: inherit; font-size: .9rem; border: 0; background: transparent; color: var(--ink-soft);
  padding: 6px 12px; border-radius: 8px; cursor: pointer;
}
.seg button.on { background: var(--surface); color: var(--ink); font-weight: 600; box-shadow: var(--shadow); }
.seg button:disabled { opacity: .4; cursor: default; }
.chart-box { position: relative; width: 100%; min-width: 0; height: min(420px, 60vh); }
.chart-box canvas { max-width: 100%; }
.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 12px; margin-top: 16px; }
.stat { background: var(--surface-2); border-radius: 10px; padding: 10px 14px; }
.stat b { display: block; font-family: var(--serif); font-size: 1.3rem; }
.stat span { font-size: .8rem; color: var(--ink-soft); }

/* Tableaux détaillés ------------------------------------------------------- */
.tabs { display: flex; gap: 6px; flex-wrap: wrap; margin-bottom: 12px; }
.tabs button {
  font: inherit; font-size: .9rem; border: 1px solid var(--line); background: var(--surface);
  color: var(--ink-soft); padding: 7px 12px; border-radius: 99px; cursor: pointer;
}
.tabs button[aria-selected="true"] { background: var(--green); border-color: var(--green); color: var(--surface); font-weight: 600; }
.table-panel h3 { margin-bottom: 4px; }
.table-meta { font-size: .88rem; color: var(--ink-soft); margin: 0 0 14px; }
.scroll { overflow-x: auto; -webkit-overflow-scrolling: touch; }
table { border-collapse: collapse; width: 100%; font-size: .92rem; font-variant-numeric: tabular-nums; }
th, td { padding: 8px 10px; border-bottom: 1px solid var(--line); text-align: right; vertical-align: top; }
thead th { font-size: .78rem; font-weight: 600; color: var(--ink-soft); vertical-align: bottom; max-width: 130px; }
thead tr.group th { text-align: center; color: var(--ink); border-bottom: 2px solid var(--green-soft); white-space: nowrap; max-width: none; }
thead tr:not(.group) th { min-width: 72px; }
tbody th { text-align: left; font-weight: 500; white-space: nowrap; position: sticky; left: 0; background: var(--surface); }
td .v { display: block; font-weight: 600; }
td .d { display: block; font-size: .75rem; }
td .d.up { color: var(--up); }
td .d.down { color: var(--down); }
td .d.flat { color: var(--ink-soft); }
td.empty { color: var(--line); }
.table-note { font-size: .82rem; color: var(--ink-soft); margin: 12px 0 0; }

/* Explications et téléchargements ------------------------------------------- */
.explain { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 14px; }
.explain article { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 18px; }
.explain h3 { margin-bottom: 8px; color: var(--green); }
.explain p { margin: 0; color: var(--ink-soft); font-size: .95rem; }
.explain strong { color: var(--ink); }

.downloads { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 10px; }
.downloads a {
  display: flex; justify-content: space-between; gap: 12px; align-items: center; text-decoration: none; color: inherit;
  background: var(--surface); border: 1px solid var(--line); border-radius: 10px; padding: 12px 14px;
}
.downloads a:hover { border-color: var(--green); }
.downloads .file { font-family: ui-monospace, "Cascadia Code", Consolas, monospace; font-size: .82rem; color: var(--green); }
.downloads .desc { font-size: .9rem; }

main { flex: 1 0 auto; width: 100%; }
.site-footer { margin-top: 56px; padding: 28px 0 40px; border-top: 1px solid var(--line); font-size: .9rem; }
.site-footer p { margin: 0 0 6px; }

.error { color: var(--up); }

/* Page « Évolution des prix » : le graphique occupe l'écran ----------------- */
.evolution { padding-top: 28px; }
.evolution-head { display: flex; flex-wrap: wrap; gap: 12px 24px; align-items: center; justify-content: space-between; margin-bottom: 16px; }
.evolution-head .controls { margin: 0; }
.chart-panel { padding: 16px 18px 12px; }
.chart-title { margin: 0 0 8px; font-size: .9rem; color: var(--ink-soft); }
/* Proportions fixes (plus large que haut), sans dépasser la hauteur de l'écran */
/* Hauteur ≈ moitié de la largeur (plafonnée à la largeur max du site), bornée par l'écran */
.page-evolution .chart-box { height: clamp(260px, min(50vw, 100vh - 260px), 560px); }
@media (max-width: 700px) { .page-evolution .chart-box { height: clamp(240px, 75vw, 100vh - 200px); } }
.page-evolution .stats { margin-top: 14px; }