/* =========================================================================
   La Radiothèque — feuille de style moderne et responsive
   ========================================================================= */

:root {
  /* Thème « laboratoire Curie » : parchemin, encre profonde, radium & cuivre. */
  --bg:            #ece6d9;
  --bg-grad-a:     #e9e2d3;
  --bg-grad-b:     #f3eee3;
  --surface:       #fbf8f1;
  --surface-2:     #f1ebdd;
  --ink:           #20201c;
  --ink-soft:      #423f36;
  --muted:         #756f60;
  --line:          #e0d8c5;
  --line-strong:   #cabfa6;

  --primary:       #1c6b5a;   /* vert radium profond */
  --primary-600:   #14503f;
  --primary-050:   #e4efe8;
  --accent:        #a8632f;   /* cuivre / minerai d'uranium */

  --rbsr: #2c5d72;
  --smnd: #6a4d72;
  --upb:  #a9742e;
  --kar:  #3f7d5f;
  --c14:  #a8473d;

  --ok:    #1c6b5a;
  --warn:  #a8632f;
  --danger:#a8473d;

  --radius:    12px;
  --radius-sm: 8px;
  --shadow:    0 1px 2px rgba(40,34,20,.06), 0 6px 20px rgba(40,34,20,.07);
  --shadow-lg: 0 12px 34px rgba(40,34,20,.16);
  --ring:      0 0 0 3px rgba(28,107,90,.22);

  --maxw: 1120px;
  --font: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-serif: "Iowan Old Style", "Palatino Linotype", Palatino, "Georgia", "Times New Roman", serif;
  --mono: "SFMono-Regular", ui-monospace, Menlo, Consolas, "Liberation Mono", monospace;
}

html[data-theme="dark"] {
  /* Chambre noire : charbon, lueur de radium. */
  --bg:          #121614;
  --bg-grad-a:   #10140f;
  --bg-grad-b:   #161c19;
  --surface:     #1a2120;
  --surface-2:   #212a28;
  --ink:         #ecf1ee;
  --ink-soft:    #c3cdc8;
  --muted:       #8a948e;
  --line:        #2b3633;
  --line-strong: #3a4742;
  --primary:     #4cbf9e;   /* lueur radium */
  --primary-600: #62d0b0;
  --primary-050: #15302a;
  --accent:      #cc8a4e;
  --rbsr: #5b97b3;
  --smnd: #a487b3;
  --upb:  #d2a45c;
  --kar:  #5fb98c;
  --c14:  #d3786e;
  --shadow:      0 1px 2px rgba(0,0,0,.45), 0 10px 30px rgba(0,0,0,.4);
  --shadow-lg:   0 14px 46px rgba(0,0,0,.55);
  --ring:        0 0 0 3px rgba(76,191,158,.32);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font);
  color: var(--ink);
  background:
    radial-gradient(1100px 560px at 82% -10%, rgba(28,107,90,.10), transparent 60%),
    linear-gradient(180deg, var(--bg-grad-a), var(--bg-grad-b));
  background-attachment: fixed;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
}

a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }

h1, h2, h3, h4 { line-height: 1.25; color: var(--ink); }
h1, h2 { font-family: var(--font-serif); font-weight: 600; }
h1 { font-size: clamp(1.9rem, 4vw, 2.7rem); letter-spacing: -.01em; }
h2 { font-size: clamp(1.4rem, 2.6vw, 1.9rem); letter-spacing: -.005em; }

/* ---------- Barre supérieure ---------- */
.topbar {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--surface) 86%, transparent);
  backdrop-filter: saturate(160%) blur(12px);
  border-bottom: 1px solid var(--line);
}
.topbar__inner {
  max-width: var(--maxw); margin: 0 auto;
  display: flex; align-items: center; gap: 1rem;
  padding: .65rem 1.1rem;
}
.brand { display: flex; align-items: center; gap: .7rem; color: var(--ink); }
.brand:hover { text-decoration: none; }
.brand__mark {
  display: grid; place-items: center;
  width: 42px; height: 42px; border-radius: 12px;
  color: #fff;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  box-shadow: var(--shadow);
}
.brand__text { display: flex; flex-direction: column; line-height: 1.1; }
.brand__text strong { font-family: var(--font-serif); font-size: 1.12rem; letter-spacing: 0; }
.brand__text em { font-style: normal; font-size: .76rem; color: var(--muted); }

.nav { margin-left: auto; display: flex; align-items: center; gap: .25rem; }
.nav a[data-nav] {
  color: var(--ink-soft); font-weight: 600; font-size: .94rem;
  padding: .5rem .8rem; border-radius: 999px;
}
.nav a[data-nav]:hover { background: var(--surface-2); text-decoration: none; }
.nav a[data-nav].is-active { color: var(--primary); background: var(--primary-050); }

.theme-toggle {
  margin-left: .4rem; width: 38px; height: 38px; border-radius: 50%;
  display: grid; place-items: center; cursor: pointer;
  border: 1px solid var(--line); background: var(--surface); color: var(--ink-soft);
}
.theme-toggle:hover { border-color: var(--line-strong); }
.theme-toggle .icon-moon { display: none; }
html[data-theme="dark"] .theme-toggle .icon-sun { display: none; }
html[data-theme="dark"] .theme-toggle .icon-moon { display: block; }

.nav-toggle { display: none; }

/* ---------- Layout ---------- */
.app { max-width: var(--maxw); margin: 0 auto; padding: 1.5rem 1.1rem 3rem; }

/* Pied de page : aligné sur le même conteneur que .app */
.site-footer { border-top: 1px solid var(--line); margin-top: 1rem; background: color-mix(in srgb, var(--surface) 55%, transparent); }
.site-footer__inner { max-width: var(--maxw); margin: 0 auto; padding: 1.4rem 1.1rem; color: var(--muted); font-size: .88rem; }
.site-footer__inner p { margin: .2rem 0; }
.site-footer__note { font-size: .82rem; }
.section { margin-top: 2.2rem; }
.muted { color: var(--muted); }
.center { text-align: center; }

.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}
.card__body { padding: 1.2rem 1.3rem; }

/* ---------- Hero ---------- */
.hero {
  position: relative; overflow: hidden;
  border-radius: var(--radius);
  background:
    radial-gradient(820px 360px at 86% -25%, rgba(76,191,158,.32), transparent 55%),
    radial-gradient(600px 300px at 8% 120%, rgba(168,99,47,.22), transparent 55%),
    linear-gradient(135deg, #15433a, #0f2a26);
  color: #fff;
  padding: clamp(1.8rem, 4vw, 3rem);
  box-shadow: var(--shadow-lg);
}
.hero h1 { color: #fff; margin: 0 0 .5rem; }
.hero p { color: rgba(255,255,255,.9); max-width: 60ch; margin: 0; font-size: 1.05rem; }
.hero__chips { margin-top: 1.3rem; display: flex; flex-wrap: wrap; gap: .5rem; }
.hero__chips .badge { background: rgba(255,255,255,.16); color: #fff; border-color: rgba(255,255,255,.28); }

/* ---------- Badges méthodes ---------- */
.badge {
  display: inline-flex; align-items: center; gap: .35rem;
  font-size: .78rem; font-weight: 700; letter-spacing: .01em;
  padding: .25rem .6rem; border-radius: 999px;
  border: 1px solid var(--line-strong); color: var(--ink-soft);
  background: var(--surface-2);
  white-space: nowrap;
}
.badge .dot { width: .55rem; height: .55rem; border-radius: 50%; background: currentColor; }
.badge--rbsr { color: var(--rbsr); border-color: color-mix(in srgb, var(--rbsr) 35%, var(--line)); background: color-mix(in srgb, var(--rbsr) 9%, var(--surface)); }
.badge--smnd { color: var(--smnd); border-color: color-mix(in srgb, var(--smnd) 35%, var(--line)); background: color-mix(in srgb, var(--smnd) 9%, var(--surface)); }
.badge--upb  { color: var(--upb);  border-color: color-mix(in srgb, var(--upb) 35%, var(--line));  background: color-mix(in srgb, var(--upb) 9%, var(--surface)); }
.badge--kar  { color: var(--kar);  border-color: color-mix(in srgb, var(--kar) 35%, var(--line));  background: color-mix(in srgb, var(--kar) 9%, var(--surface)); }
.badge--c14  { color: var(--c14);  border-color: color-mix(in srgb, var(--c14) 35%, var(--line));  background: color-mix(in srgb, var(--c14) 9%, var(--surface)); }

/* ---------- Layout accueil ---------- */
.home-grid {
  display: grid; gap: 1.4rem;
  grid-template-columns: 1.7fr 1fr;
  align-items: start;
  margin-top: 1.6rem;
}
@media (max-width: 880px) { .home-grid { grid-template-columns: 1fr; } }

.section-head { display: flex; align-items: baseline; justify-content: space-between; gap: 1rem; margin-bottom: .9rem; }
.section-head h2 { margin: 0; }
.count-pill { font-size: .82rem; color: var(--muted); background: var(--surface-2); border: 1px solid var(--line); border-radius: 999px; padding: .15rem .6rem; }

/* Cartes objets */
.objects { display: grid; gap: .9rem; }
.obj-card {
  display: flex; flex-direction: column; gap: .6rem;
  padding: 1.05rem 1.15rem;
  background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--radius); box-shadow: var(--shadow);
  transition: transform .14s ease, box-shadow .14s ease, border-color .14s ease;
}
.obj-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-lg); border-color: var(--line-strong); }
.obj-card--link { color: inherit; text-decoration: none; cursor: pointer; }
.obj-card--link:hover { text-decoration: none; border-color: var(--primary); }
.obj-card--link:hover .obj-card__cta { gap: .5rem; }
.obj-card__cta { margin-top: .15rem; font-weight: 700; font-size: .86rem; color: var(--primary); display: inline-flex; gap: .3rem; transition: gap .14s ease; }
.obj-card__hint { margin: 0; font-size: .82rem; color: var(--muted); }
.obj-card__title { font-size: 1.12rem; font-weight: 700; margin: 0; }
.obj-card__meta { font-size: .86rem; color: var(--muted); display: flex; align-items: center; gap: .4rem; }
.obj-card__methods { display: flex; flex-wrap: wrap; gap: .5rem; margin-top: .2rem; }
.method-link {
  display: inline-flex; align-items: center; gap: .4rem;
  font-weight: 700; font-size: .82rem; padding: .35rem .7rem;
  border-radius: 999px; border: 1px solid var(--line-strong);
  background: var(--surface-2); color: var(--ink-soft); cursor: pointer;
}
.method-link:hover { text-decoration: none; border-color: currentColor; }
.method-link .dot { width: .5rem; height: .5rem; border-radius: 50%; background: currentColor; }
.method-link[data-m="rbsr"] { color: var(--rbsr); }
.method-link[data-m="smnd"] { color: var(--smnd); }
.method-link[data-m="upb"]  { color: var(--upb); }
.method-link[data-m="kar"]  { color: var(--kar); }
.method-link[data-m="c14"]  { color: var(--c14); }

/* ---------- Formulaires ---------- */
.field { display: flex; flex-direction: column; gap: .35rem; margin-bottom: 1rem; }
.field label { font-weight: 600; font-size: .88rem; color: var(--ink-soft); }
input[type="text"], input[type="email"], input[type="number"], select, textarea {
  width: 100%; font: inherit; color: var(--ink);
  background: var(--surface-2); border: 1px solid var(--line-strong);
  border-radius: var(--radius-sm); padding: .6rem .7rem; transition: border-color .12s, box-shadow .12s;
}
input:focus, select:focus, textarea:focus { outline: none; border-color: var(--primary); box-shadow: var(--ring); }
textarea { resize: vertical; min-height: 120px; }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: .5rem;
  font: inherit; font-weight: 700; cursor: pointer;
  padding: .62rem 1.1rem; border-radius: var(--radius-sm);
  border: 1px solid transparent; background: var(--primary); color: #fff;
  transition: background .12s, transform .08s, box-shadow .12s;
}
.btn:hover { background: var(--primary-600); text-decoration: none; }
.btn:active { transform: translateY(1px); }
.btn--block { width: 100%; }
.btn--ghost { background: var(--surface); color: var(--ink-soft); border-color: var(--line-strong); }
.btn--ghost:hover { background: var(--surface-2); }
.btn--sm { padding: .4rem .75rem; font-size: .85rem; }
.btn-row { display: flex; flex-wrap: wrap; gap: .5rem; }

/* ---------- Fiche objet ---------- */
.breadcrumb { font-size: .88rem; color: var(--muted); margin-bottom: .9rem; }
.detail-head {
  display: grid; gap: 1.2rem; grid-template-columns: 1.4fr 1fr; align-items: stretch;
}
@media (max-width: 880px) { .detail-head { grid-template-columns: 1fr; } }
.detail-desc p { margin: .4rem 0; }
.kv { color: var(--ink-soft); }
.kv b { color: var(--ink); }

.map-box { align-self: start; padding: 0; overflow: hidden; min-height: 240px; }
.map-box :is(iframe, .folium-map) { width: 100% !important; min-height: 280px; border: 0; border-radius: var(--radius); }
.map-box > div { width: 100%; }

.result-grid { display: grid; gap: 1.2rem; grid-template-columns: 1.3fr 1fr; align-items: stretch; }
.plot-grid { display: grid; gap: 1.2rem; grid-template-columns: 1fr 1fr; align-items: stretch; }
.plot-grid > div { display: flex; }
.plot-grid > div > .plot { flex: 1; }
@media (max-width: 880px) { .result-grid, .plot-grid { grid-template-columns: 1fr; } }

.plot { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: .8rem; text-align: center; box-shadow: var(--shadow); display: flex; flex-direction: column; }
.plot a { flex: 1; display: flex; align-items: center; justify-content: center; }
.plot img { max-width: 100%; height: auto; border-radius: var(--radius-sm); cursor: zoom-in; }
.plot h3 { margin: .2rem 0 .8rem; font-size: 1rem; }

.stat { display: flex; flex-direction: column; gap: .15rem; padding: .9rem 0; border-bottom: 1px dashed var(--line); }
.stat:last-child { border-bottom: 0; }
.stat__label { font-size: .8rem; color: var(--muted); text-transform: uppercase; letter-spacing: .04em; }
.stat__value { font-size: 1.25rem; font-weight: 800; color: var(--ink); }
.stat__value small { font-size: .85rem; font-weight: 600; color: var(--muted); }
.equation { font-family: var(--mono); font-size: .92rem; background: var(--surface-2); border: 1px solid var(--line); border-radius: var(--radius-sm); padding: .5rem .7rem; word-break: break-word; }

.adjust-row { display: flex; flex-wrap: wrap; gap: 1rem; align-items: flex-end; }
.adjust-row .field { margin: 0; min-width: 150px; flex: 1; }

pre.codeblock {
  background: #0c1322; color: #e6edf7; border: 1px solid #1d2942;
  border-radius: var(--radius-sm); padding: 1rem 1.1rem; overflow: auto;
  font-family: var(--mono); font-size: .85rem; line-height: 1.55; max-height: 460px;
  white-space: pre-wrap; word-break: break-word;
}

.sources :is(p) { margin: .4rem 0; font-size: .92rem; color: var(--ink-soft); }

/* ---------- Tables (data examples / principes) ---------- */
.table-wrap { overflow-x: auto; border-radius: var(--radius-sm); border: 1px solid var(--line); }
table.data { border-collapse: collapse; width: 100%; font-size: .9rem; background: var(--surface); }
table.data th, table.data td { border: 1px solid var(--line); padding: .55rem .7rem; text-align: center; }
table.data thead th { background: var(--surface-2); font-weight: 700; }

/* ---------- Article principes ---------- */
.article { max-width: 860px; margin: 0 auto; }
.article h2 { margin-top: 2.2rem; padding-top: .4rem; }
.article h3 { font-family: var(--font-serif); font-weight: 600; margin-top: 1.8rem; color: var(--primary); }
.article h4 { margin-top: 1.3rem; }
.article h5 { margin-top: 1rem; margin-bottom: .2rem; color: var(--ink-soft); }
.article p { margin: .7rem 0; }
.article ul { margin: .6rem 0; padding-left: 1.3rem; }
.article li { margin: .35rem 0; }
.article strong { color: var(--ink); }
.article figure { margin: 1.6rem 0; text-align: center; }
.article figure img { width: 100%; max-width: 480px; height: auto; border-radius: var(--radius-sm); border: 1px solid var(--line); box-shadow: var(--shadow); background: #fff; padding: .4rem; }

/* Étapes Rb-Sr : grille responsive (remplace l'ancien tableau) */
.rbsr-steps { margin: 1.4rem 0; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; background: var(--surface); box-shadow: var(--shadow); }
.rbsr-step { display: grid; grid-template-columns: 1fr 300px; gap: 1.4rem; align-items: center; padding: 1.2rem 1.3rem; }
.rbsr-step + .rbsr-step { border-top: 1px solid var(--line); }
.rbsr-step__text p { margin: 0; }
.rbsr-step__tag { display: inline-block; margin-bottom: .5rem; font-size: .76rem; font-weight: 700; letter-spacing: .02em; text-transform: uppercase; color: var(--primary); background: var(--primary-050); border-radius: 999px; padding: .2rem .6rem; }
.rbsr-step__fig { margin: 0; text-align: center; }
.article .rbsr-step__fig img { width: 100%; max-width: 300px; height: auto; border: 1px solid var(--line); border-radius: var(--radius-sm); background: #fff; padding: .4rem; box-shadow: var(--shadow); }
@media (max-width: 640px) {
  .rbsr-step { grid-template-columns: 1fr; gap: .9rem; }
  .article .rbsr-step__fig img { max-width: 360px; }
}
.article figcaption { font-size: .82rem; color: var(--muted); margin-top: .4rem; }
.article .table-wrap { margin: 1.2rem 0; }
.formula { background: var(--surface-2); border-left: 3px solid var(--primary); border-radius: 8px; padding: .6rem .9rem; margin: .8rem 0; font-family: var(--mono); font-size: .95rem; overflow-x: auto; }
.toc { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 1rem 1.2rem; box-shadow: var(--shadow); }
.toc ul { list-style: none; margin: .4rem 0 0; padding: 0; columns: 2; }
.toc li { margin: .3rem 0; break-inside: avoid; }

/* Simulation isochrone */
.sim { margin: 1.4rem 0; }
.sim__canvas-wrap { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 1rem; box-shadow: var(--shadow); }
.sim canvas { width: 100%; height: auto; display: block; }
.sim__controls { display: flex; align-items: center; gap: 1rem; margin-top: .9rem; }
.sim__controls input[type="range"] { flex: 1; accent-color: var(--primary); }
.sim__value { font-variant-numeric: tabular-nums; font-weight: 800; min-width: 7ch; text-align: right; color: var(--primary); }

/* ---------- États / utilitaires ---------- */
.notice { display: flex; gap: .7rem; align-items: flex-start; padding: 1rem 1.1rem; border-radius: var(--radius-sm); border: 1px solid var(--line); background: var(--surface-2); color: var(--ink-soft); font-size: .92rem; }
.notice--warn { border-color: color-mix(in srgb, var(--warn) 40%, var(--line)); background: color-mix(in srgb, var(--warn) 8%, var(--surface)); }
.notice--error { border-color: color-mix(in srgb, var(--danger) 45%, var(--line)); background: color-mix(in srgb, var(--danger) 8%, var(--surface)); color: var(--danger); }

.spinner { width: 30px; height: 30px; border-radius: 50%; border: 3px solid var(--line); border-top-color: var(--primary); animation: spin .8s linear infinite; }
.loading { display: flex; flex-direction: column; align-items: center; gap: .8rem; padding: 3rem 1rem; color: var(--muted); }
@keyframes spin { to { transform: rotate(360deg); } }

.skeleton { background: linear-gradient(90deg, var(--surface-2) 25%, var(--line) 37%, var(--surface-2) 63%); background-size: 400% 100%; animation: shimmer 1.3s ease infinite; border-radius: var(--radius-sm); }
@keyframes shimmer { 0% { background-position: 100% 0; } 100% { background-position: -100% 0; } }

.toast {
  position: fixed; left: 50%; bottom: 1.5rem; transform: translate(-50%, 2rem);
  background: var(--ink); color: #fff; padding: .7rem 1.1rem; border-radius: 999px;
  box-shadow: var(--shadow-lg); font-weight: 600; font-size: .9rem;
  opacity: 0; pointer-events: none; transition: opacity .2s, transform .2s; z-index: 100; max-width: 90vw;
}
.toast.show { opacity: 1; transform: translate(-50%, 0); }
.toast.toast--error { background: var(--danger); }

/* Lightbox */
.lightbox { position: fixed; inset: 0; background: rgba(8,12,22,.86); display: none; place-items: center; z-index: 200; padding: 1.5rem; cursor: zoom-out; }
.lightbox.show { display: grid; }
.lightbox img { max-width: 95vw; max-height: 92vh; border-radius: 10px; box-shadow: var(--shadow-lg); }

/* Upload */
.upload-grid { display: grid; gap: 1.2rem; grid-template-columns: 1fr 1fr; align-items: start; }
@media (max-width: 760px) { .upload-grid { grid-template-columns: 1fr; } }
.dropzone { border: 2px dashed var(--line-strong); border-radius: var(--radius); padding: 1.6rem; text-align: center; background: var(--surface-2); transition: border-color .12s, background .12s; }
.dropzone.dragover { border-color: var(--primary); background: var(--primary-050); }
.dropzone input[type="file"] { margin: .8rem auto 0; max-width: 320px; }
.tabs { display: flex; gap: .4rem; flex-wrap: wrap; margin-bottom: 1.1rem; }
.tab { padding: .5rem .95rem; border-radius: 999px; border: 1px solid var(--line-strong); background: var(--surface); color: var(--ink-soft); font-weight: 700; cursor: pointer; }
.tab.is-active { background: var(--primary); color: #fff; border-color: var(--primary); }

/* ---------- Responsive nav ---------- */
@media (max-width: 720px) {
  .nav-toggle {
    display: inline-flex; flex-direction: column; gap: 5px; margin-left: auto;
    width: 42px; height: 42px; align-items: center; justify-content: center;
    border: 1px solid var(--line); border-radius: 10px; background: var(--surface); cursor: pointer;
  }
  .nav-toggle span { width: 20px; height: 2px; background: var(--ink); border-radius: 2px; transition: .2s; }
  .nav {
    position: absolute; top: 100%; left: 0; right: 0;
    flex-direction: column; align-items: stretch; gap: .25rem;
    background: var(--surface); border-bottom: 1px solid var(--line);
    padding: .6rem 1.1rem 1rem; box-shadow: var(--shadow-lg);
    display: none;
  }
  .nav.open { display: flex; }
  .nav a[data-nav] { padding: .7rem .8rem; border-radius: 10px; }
  .theme-toggle { margin: .3rem 0 0; align-self: flex-start; }
}