/* ==========================================================================
   lu : page "Liste des unités" (Converticious)
   Hero + recherche, navigation par catégories collante, cartes par catégorie,
   grille d'unités, conversions populaires, raccourci avec boutons "copier".
   Tout est préfixé .lu-* ; accent modifiable via les variables ci-dessous.
   ========================================================================== */

body.lu-page { background: #f6f6f8; }

.lu {
  --lu-accent: #2488a8;
  --lu-accent-ink: #17617a;
  --lu-accent-soft: #eaf6f8;
  --lu-tag: #d5eef6;
  --lu-tag-ink: #14566e;
  --lu-ink: #1c1c21;
  --lu-muted: #6a6a75;
  --lu-line: #e3e3ea;
  --lu-field: #f8f8fb;
  max-width: 1100px;
  margin: 0 auto;
  padding: 16px 14px 56px;
  color: var(--lu-ink);
}
.lu, .lu *, .lu *::before, .lu *::after { box-sizing: border-box; }
.lu a { text-decoration: none; }
@media (prefers-reduced-motion: no-preference) { html { scroll-behavior: smooth; } }

/* ---------- Hero + recherche ---------- */
.lu-hero {
  padding: 26px 18px 20px;
  border-radius: 20px;
  background: linear-gradient(135deg, #eaf6f8 0%, #ffffff 70%);
  border: 1px solid var(--lu-line);
}
.lu .lu-h1 {
  margin: 0 0 8px;
  font-size: clamp(26px, 4.4vw, 38px);
  line-height: 1.15;
  font-weight: 800;
  letter-spacing: -.01em;
  color: #12313b;
}
.lu .lu-lead { margin: 0 0 18px; font-size: 16px; line-height: 1.5; color: var(--lu-muted); max-width: 62ch; }

.lu-search { position: relative; }
.lu-search svg { position: absolute; left: 16px; top: 50%; width: 20px; height: 20px; margin-top: -10px; pointer-events: none; color: var(--lu-muted); }
.lu .lu-q {
  display: block;
  width: 100%;
  height: 56px;
  margin: 0;
  padding: 0 16px 0 48px;
  border: 1.5px solid var(--lu-line);
  border-radius: 16px;
  background: #fff;
  box-shadow: 0 1px 2px rgba(20, 20, 40, .04);
  font-family: inherit;
  font-size: 17px;              /* >= 16px : pas de zoom auto sur iOS */
  font-weight: 600;
  color: var(--lu-ink);
  -webkit-appearance: none;
  appearance: none;
}
.lu .lu-q::placeholder { font-weight: 500; color: #9a9aa6; }
.lu .lu-q:focus { outline: 0; border-color: var(--lu-accent); box-shadow: 0 0 0 4px var(--lu-accent-soft); }
.lu-status { min-height: 20px; margin: 10px 4px 0; font-size: 13.5px; color: var(--lu-muted); }

/* ---------- Navigation par catégories (collante) ---------- */
.lu-nav {
  position: sticky;
  top: 0;
  z-index: 30;
  margin: 12px -14px 0;
  padding: 10px 14px;
  background: rgba(246, 246, 248, .9);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  backdrop-filter: saturate(180%) blur(12px);
}
.lu-nav-in { position: relative; display: flex; gap: 8px; padding: 2px; overflow-x: auto; scrollbar-width: none; -webkit-overflow-scrolling: touch; }
.lu-nav-in::-webkit-scrollbar { display: none; }
.lu-chip {
  flex: none;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  height: 40px;
  padding: 0 14px 0 10px;
  border: 1.5px solid var(--lu-line);
  border-radius: 999px;
  background: #fff;
  font-size: 14px;
  font-weight: 600;
  white-space: nowrap;
  color: var(--lu-ink);
  transition: background .15s, border-color .15s, color .15s, opacity .15s;
}
.lu-chip img { width: 20px; height: 20px; }
.lu-chip:hover { border-color: #c9c9d3; }
.lu-chip.is-active { background: var(--lu-accent-soft); border-color: var(--lu-accent); color: var(--lu-accent-ink); }
.lu-chip.is-off { opacity: .35; }
.lu-chip:focus-visible { outline: 2px solid var(--lu-accent); outline-offset: 2px; }

/* ---------- Cartes catégorie ---------- */
.lu-cat {
  margin: 16px 0 0;
  padding: 16px;
  background: #fff;
  border: 1px solid var(--lu-line);
  border-radius: 20px;
  box-shadow: 0 1px 2px rgba(20, 20, 40, .04), 0 8px 24px rgba(20, 20, 40, .05);
  scroll-margin-top: 72px;
}
.lu-cat[hidden], .lu-u[hidden], .lu-empty[hidden] { display: none; }

.lu-cat-head { display: flex; align-items: center; gap: 12px; }
.lu-ico {
  flex: none;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: 14px;
  background: var(--lu-accent-soft);
}
.lu-ico img { width: 28px; height: 28px; }
.lu .lu-h2 { margin: 0; font-size: 22px; line-height: 1.2; font-weight: 800; color: #12313b; }
.lu-count {
  margin-left: auto;
  flex: none;
  padding: 4px 10px;
  border-radius: 999px;
  background: #eef0f4;
  font-size: 12px;
  font-weight: 700;
  color: var(--lu-muted);
  white-space: nowrap;
}

/* boutons d'action */
.lu-act { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; margin: 14px 0 0; }
.lu-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 42px;
  padding: 0 16px;
  border: 1.5px solid var(--lu-line);
  border-radius: 999px;
  background: #fff;
  font-size: 14.5px;
  font-weight: 600;
  color: var(--lu-ink);
  transition: background .15s, border-color .15s, color .15s, box-shadow .15s;
}
.lu-btn svg { width: 16px; height: 16px; flex: none; }
.lu-btn:hover { border-color: var(--lu-accent); color: var(--lu-accent-ink); background: var(--lu-accent-soft); }
.lu-btn--main { background: var(--lu-accent); border-color: var(--lu-accent); color: #fff; box-shadow: 0 4px 12px rgba(36, 136, 168, .28); }
.lu-btn--main:hover { background: var(--lu-accent-ink); border-color: var(--lu-accent-ink); color: #fff; }
.lu-btn:focus-visible { outline: 2px solid var(--lu-accent); outline-offset: 2px; }
.lu-note { font-size: 13px; color: var(--lu-muted); }

/* conversions populaires */
.lu-pop { margin: 14px 0 0; }
.lu-pop-t { display: block; margin: 0 0 8px 2px; font-size: 11.5px; font-weight: 700; letter-spacing: .05em; text-transform: uppercase; color: var(--lu-muted); }
.lu-pop-l { display: flex; flex-wrap: wrap; gap: 6px; }
.lu-pill {
  display: inline-flex;
  align-items: center;
  min-height: 34px;
  padding: 0 12px;
  border: 1px solid var(--lu-tag);
  border-radius: 999px;
  background: #f3fafc;
  font-size: 13.5px;
  font-weight: 600;
  color: var(--lu-accent-ink);
  transition: background .15s, border-color .15s;
}
.lu-pill:hover { background: var(--lu-accent-soft); border-color: var(--lu-accent); }
.lu-pill:focus-visible { outline: 2px solid var(--lu-accent); outline-offset: 2px; }

/* grille d'unités */
.lu-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(230px, 1fr)); gap: 8px; margin: 16px 0 0; padding: 0; list-style: none; }
.lu-u { display: flex; flex-wrap: wrap; align-items: center; gap: 6px 10px; margin: 0; padding: 9px 12px; border-radius: 12px; background: var(--lu-field); }
.lu-ab {
  flex: none;
  max-width: 100%;
  min-width: 2.4em;
  padding: 3px 9px;
  border-radius: 8px;
  background: var(--lu-tag);
  font-size: 13.5px;
  font-weight: 700;
  line-height: 1.3;
  text-align: center;
  color: var(--lu-tag-ink);
}
.lu-nm { min-width: 0; font-size: 14.5px; line-height: 1.3; color: var(--lu-ink); }
.lu-ab--long { text-align: left; }

.lu-empty { margin: 20px 0 0; padding: 28px 18px; border: 1.5px dashed var(--lu-line); border-radius: 18px; background: #fff; text-align: center; font-size: 15px; color: var(--lu-muted); }

/* ---------- Raccourci vers un convertisseur ---------- */
.lu-how { margin: 24px 0 0; padding: 20px 16px; background: #fff; border: 1px solid var(--lu-line); border-radius: 20px; box-shadow: 0 1px 2px rgba(20, 20, 40, .04), 0 8px 24px rgba(20, 20, 40, .05); }
.lu-how p { margin: 14px 0; font-size: 15px; line-height: 1.65; color: var(--lu-ink); }
.lu-how .outlined_el_g { padding: 1px 7px; border-radius: 6px; background: #fff3cf; font-weight: 600; color: #6b4e00; }
.lu-copy { display: flex; gap: 8px; }
.lu .lu-copy input {
  flex: 1;
  min-width: 0;
  height: 48px;
  margin: 0;
  padding: 0 14px;
  border: 1.5px solid var(--lu-line);
  border-radius: 12px;
  background: var(--lu-field);
  box-shadow: none;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 14px !important;
  color: var(--lu-ink);
}
.lu .lu-copy input:focus { outline: 0; border-color: var(--lu-accent); box-shadow: 0 0 0 4px var(--lu-accent-soft); background: #fff; }
.lu-copy-btn {
  flex: none;
  min-width: 92px;
  height: 48px;
  padding: 0 16px;
  border: 0;
  border-radius: 12px;
  background: var(--lu-accent);
  font-family: inherit;
  font-size: 14.5px;
  font-weight: 700;
  color: #fff;
  cursor: pointer;
  transition: background .15s;
}
.lu-copy-btn:hover { background: var(--lu-accent-ink); }
.lu-copy-btn.is-done { background: #15803d; }
.lu-copy-btn:focus-visible { outline: 2px solid var(--lu-accent); outline-offset: 2px; }
.lu-disc { display: flex; gap: 10px; align-items: flex-start; margin: 18px 0 0 !important; padding: 12px 14px; border-radius: 12px; background: var(--lu-field); font-size: 13.5px !important; line-height: 1.5 !important; color: var(--lu-muted) !important; }
.lu-disc svg { flex: none; width: 20px; height: 20px; margin-top: 1px; stroke: var(--lu-muted); }

/* ---------- Retour en haut ---------- */
.lu-top {
  position: fixed;
  right: 16px;
  bottom: max(16px, env(safe-area-inset-bottom));
  z-index: 40;
  width: 46px;
  height: 46px;
  border: 0;
  border-radius: 50%;
  background: var(--lu-accent);
  box-shadow: 0 6px 18px rgba(20, 20, 40, .25);
  color: #fff;
  font-size: 20px;
  line-height: 1;
  cursor: pointer;
  opacity: 0;
  transform: translateY(10px);
  pointer-events: none;
  transition: opacity .2s, transform .2s;
}
.lu-top.is-on { opacity: 1; transform: none; pointer-events: auto; }

/* ---------- Desktop ---------- */
@media (min-width: 640px) {
  .lu { padding: 24px 20px 72px; }
  .lu-hero { padding: 36px 32px 28px; }
  .lu-nav { margin: 14px -20px 0; padding: 10px 20px; }
  .lu-cat { padding: 24px 28px; }
  .lu-ico { width: 56px; height: 56px; border-radius: 16px; }
  .lu-ico img { width: 32px; height: 32px; }
  .lu .lu-h2 { font-size: 26px; }
  .lu-how { padding: 26px 28px; }
}

@media (prefers-reduced-motion: reduce) { .lu *, .lu-top { transition: none !important; } }
@media print { .lu-nav, .lu-search, .lu-top, .lu-copy-btn { display: none !important; } .lu-cat { box-shadow: none; break-inside: avoid; } }