:root {
  --fondo: #f6f3ee;
  --superficie: #ffffff;
  --texto: #1f1b16;
  --suave: #6b6359;
  --borde: #e2dbd0;
  --acento: #8a4b14;      /* ocre / bastnäsita */
  --acento2: #2f6f6a;     /* verde mineral */
  --lree: #c0703a;
  --hree: #3c6e9e;
  --ok: #2f7d4a;
  --mal: #b03a2e;
  --pend: #b58a12;
  --radio: 12px;
  --sombra: 0 1px 3px rgba(0,0,0,.08), 0 4px 16px rgba(0,0,0,.04);
}
@media (prefers-color-scheme: dark) {
  :root {
    --fondo: #16130f; --superficie: #211d18; --texto: #efe8dd; --suave: #a89e90;
    --borde: #3a332b; --acento: #e0a066; --acento2: #6fbdb5; --lree: #e09a66; --hree: #7fa9d6;
  }
}
* { box-sizing: border-box; }
body { margin: 0; font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; background: var(--fondo); color: var(--texto); line-height: 1.55; }
a { color: var(--acento); }
h1, h2, h3 { line-height: 1.2; }
h1 { font-size: clamp(1.8rem, 4vw, 2.6rem); margin: .2em 0; }
h2 { margin-top: 1.6em; }

/* Barra superior */
.topbar { position: sticky; top: 0; z-index: 10; display: flex; align-items: center; gap: 1rem; padding: .6rem 1rem;
  background: var(--superficie); border-bottom: 1px solid var(--borde); flex-wrap: wrap; }
.marca { font-weight: 700; text-decoration: none; color: var(--texto); display: flex; align-items: center; gap: .5rem; }
.logo { display: inline-grid; place-items: center; width: 34px; height: 34px; border-radius: 8px; background: var(--acento); color: #fff; font-weight: 800; }
nav { display: flex; gap: .2rem; flex-wrap: wrap; align-items: center; margin-left: auto; }
nav a { text-decoration: none; color: var(--suave); padding: .35rem .6rem; border-radius: 8px; font-size: .93rem; }
nav a:hover, nav a.activo { background: var(--fondo); color: var(--texto); }
.menu-btn { display: none; margin-left: auto; background: none; border: 1px solid var(--borde); border-radius: 8px; font-size: 1.2rem; padding: .2rem .6rem; color: var(--texto); }
@media (max-width: 860px) {
  .menu-btn { display: block; }
  nav { display: none; width: 100%; flex-direction: column; align-items: stretch; }
  nav.abierto { display: flex; }
}
body:not(.login) .solo-login, body:not(.esp) .solo-esp, body:not(.admin) .solo-admin { display: none !important; }

main { max-width: 1180px; margin: 0 auto; padding: 1.2rem 16px 3rem; min-height: 70vh; }
.pie { border-top: 1px solid var(--borde); color: var(--suave); font-size: .85rem; padding: 1rem 16px; text-align: center; }

/* Componentes */
.tarjeta { background: var(--superficie); border: 1px solid var(--borde); border-radius: var(--radio); padding: 1rem 1.2rem; box-shadow: var(--sombra); }
.rejilla { display: grid; gap: 1rem; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); }
.rejilla.chica { grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); }
.btn { background: var(--acento); color: #fff; border: 0; border-radius: 8px; padding: .55rem 1rem; font: inherit; cursor: pointer; }
.btn.sec { background: transparent; color: var(--texto); border: 1px solid var(--borde); }
.btn.ok { background: var(--ok); } .btn.mal { background: var(--mal); }
.btn:disabled { opacity: .5; cursor: default; }
.fila { display: flex; gap: .6rem; flex-wrap: wrap; align-items: center; }
.pequeno { font-size: .85rem; color: var(--suave); }
.error { color: var(--mal); min-height: 1.2em; margin: .3rem 0; }
.aviso { padding: .7rem 1rem; border-radius: 8px; background: color-mix(in srgb, var(--acento2) 14%, transparent); border: 1px solid color-mix(in srgb, var(--acento2) 40%, transparent); }
.chip { display: inline-block; font-size: .75rem; padding: .1rem .5rem; border-radius: 99px; border: 1px solid var(--borde); color: var(--suave); }
.chip.lree { color: var(--lree); border-color: var(--lree); } .chip.hree { color: var(--hree); border-color: var(--hree); }
.chip.pendiente { color: var(--pend); border-color: var(--pend); } .chip.aprobado { color: var(--ok); border-color: var(--ok); } .chip.rechazado { color: var(--mal); border-color: var(--mal); }

/* Formularios */
.form { display: grid; gap: .7rem; }
.form label { display: grid; gap: .25rem; font-size: .9rem; color: var(--suave); }
input, select, textarea { font: inherit; padding: .5rem .6rem; border-radius: 8px; border: 1px solid var(--borde); background: var(--fondo); color: var(--texto); width: 100%; }
textarea { min-height: 80px; resize: vertical; }
.dos-col { display: grid; gap: .7rem; grid-template-columns: 1fr 1fr; }
@media (max-width: 640px) { .dos-col { grid-template-columns: 1fr; } }
.preview { max-width: 100%; max-height: 260px; border-radius: 8px; display: block; }

/* Hero */
.hero { display: grid; gap: 1.5rem; grid-template-columns: 1.3fr 1fr; align-items: center; padding: 1rem 0 1.5rem; }
.hero p { font-size: 1.08rem; color: var(--suave); }
@media (max-width: 760px) { .hero { grid-template-columns: 1fr; } }
.cifras { display: grid; grid-template-columns: repeat(3, 1fr); gap: .8rem; }
.cifra { text-align: center; } .cifra b { display: block; font-size: 1.8rem; color: var(--acento); }

/* Tabla periódica de TR */
.tp { display: grid; grid-template-columns: repeat(auto-fill, minmax(92px, 1fr)); gap: .5rem; }
.el { border: 1px solid var(--borde); border-radius: 10px; padding: .5rem; background: var(--superficie); cursor: pointer; text-align: left; font: inherit; color: inherit; }
.el .z { font-size: .7rem; color: var(--suave); } .el .s { font-size: 1.5rem; font-weight: 700; display: block; }
.el .n { font-size: .75rem; color: var(--suave); }
.el.LREE { border-top: 4px solid var(--lree); } .el.HREE { border-top: 4px solid var(--hree); } .el.Sc\/Y { border-top: 4px solid var(--acento2); }
.el.sel { outline: 2px solid var(--acento); }

/* Minerales */
.mineral { cursor: pointer; display: grid; gap: .4rem; transition: transform .15s; }
.mineral:hover { transform: translateY(-2px); }
.mineral svg { width: 100%; height: 150px; }
.formula { font-family: "Cambria Math", Georgia, serif; }
dl.props { display: grid; grid-template-columns: max-content 1fr; gap: .3rem 1rem; margin: 0; }
dl.props dt { color: var(--suave); font-size: .88rem; } dl.props dd { margin: 0; }
.detalle { display: grid; grid-template-columns: 300px 1fr; gap: 1.5rem; }
@media (max-width: 760px) { .detalle { grid-template-columns: 1fr; } }

/* Cristalografía */
.cristal { display: grid; grid-template-columns: 1.1fr 1fr; gap: 1.2rem; }
@media (max-width: 860px) { .cristal { grid-template-columns: 1fr; } }
.visor3d { width: 100%; aspect-ratio: 1; background: radial-gradient(circle at 50% 40%, var(--superficie), var(--fondo)); border-radius: var(--radio); border: 1px solid var(--borde); cursor: grab; touch-action: none; }
.visor3d:active { cursor: grabbing; }
.tabla-wrap { overflow-x: auto; }
table { border-collapse: collapse; width: 100%; font-size: .9rem; }
th, td { padding: .45rem .6rem; border-bottom: 1px solid var(--borde); text-align: left; white-space: nowrap; }
th { color: var(--suave); font-weight: 600; }
.leyenda { display: flex; gap: 1rem; font-size: .85rem; flex-wrap: wrap; }
.leyenda i { display: inline-block; width: 12px; height: 3px; vertical-align: middle; margin-right: 4px; }

/* Galería */
.foto { padding: 0; overflow: hidden; display: flex; flex-direction: column; }
.foto img { width: 100%; aspect-ratio: 4/3; object-fit: cover; cursor: zoom-in; display: block; background: var(--borde); }
.foto .info { padding: .7rem .9rem; display: grid; gap: .25rem; font-size: .88rem; }
.foto .info b { font-size: 1rem; }
dialog { border: 0; padding: 0; background: transparent; max-width: min(960px, 94vw); color: var(--texto); }
dialog::backdrop { background: rgba(0,0,0,.6); }
.visor .tarjeta { display: grid; gap: .8rem; }
.visor img { max-width: 100%; max-height: 70vh; border-radius: 8px; }
#dlgAcceso .tarjeta { width: min(420px, 92vw); }
body:not(.modo-registro) .solo-registro { display: none; }

/* Revisión */
.revision-item { display: grid; grid-template-columns: 260px 1fr; gap: 1rem; }
.revision-item img { width: 100%; border-radius: 8px; }
@media (max-width: 760px) { .revision-item { grid-template-columns: 1fr; } }
[hidden] { display: none !important; }

/* Foto real de mineral */
.foto-min { margin: 0; display: grid; gap: .3rem; }
.foto-min img { width: 100%; aspect-ratio: 4/3; object-fit: cover; border-radius: 8px; background: var(--borde); display: block; }
.foto-min .dibujo svg { width: 100%; height: auto; max-height: 280px; }
.foto-min figcaption:empty { display: none; }
.dibujo-extra { display: none; }
.foto-min:has(img:not([hidden])) + .dibujo-extra { display: block; max-width: 140px; margin: .5rem auto 0; }

/* Edición y animaciones */
.btn-chico { padding: .3rem .7rem; font-size: .85rem; text-decoration: none; display: inline-block; }
.barra-admin { display: flex; justify-content: flex-end; margin-bottom: .5rem; }
.editable { outline: 2px dashed var(--acento); outline-offset: 3px; border-radius: 4px; background: color-mix(in srgb, var(--acento) 8%, transparent); }
.poliedro { display: grid; gap: .35rem; }
.lienzo-pol { cursor: grab; touch-action: none; }
.lienzo-pol svg { width: 100%; height: auto; display: block; }
.lienzo-sus { width: 100%; height: auto; border-radius: var(--radio); border: 1px solid var(--borde); display: block; }
.pestanas { margin-bottom: .6rem; }
details summary { cursor: pointer; margin-top: .5rem; }
.chip-check { gap: .3rem; font-size: .85rem; border: 1px solid var(--borde); border-radius: 99px; padding: .15rem .55rem; }
.chip-check input { width: auto; }
.chip-check i { width: 10px; height: 10px; border-radius: 50%; display: inline-block; }
.form label.chip-check { display: inline-flex; align-items: center; color: var(--texto); }