/* Bases de datos — estilos propios sobre las variables de /styles.css */
.bd { max-width: 78ch; font-size: 1.05rem; color: var(--ink-soft); }
.bd.wide { max-width: 1040px; }
.bd h2 { color: var(--ink); font-size: 1.5rem; margin: 2.4rem 0 .9rem; scroll-margin-top: 90px; }
.bd h3 { color: var(--ink); font-size: 1.2rem; margin: 1.8rem 0 .5rem; }
.bd h4 { color: var(--ink); font-size: 1.05rem; margin: 1.2rem 0 .4rem; }
.bd h5 { color: var(--ink); font-size: .95rem; margin: 1rem 0 .3rem; }
.bd p { margin-bottom: 1.05rem; }
.bd strong { color: var(--ink); }
.bd a { color: var(--accent); }
.bd ul, .bd ol { margin: 0 0 1.2rem 1.3rem; list-style: revert; }
.bd li { margin-bottom: .4rem; padding-left: .1rem; } .bd li::before { content: none !important; }
.bd :not(pre) > code { background: var(--bg-2); border: 1px solid var(--line); border-radius: 5px; padding: .06em .35em; font-size: .88em; color: var(--ink); }
.bd table { border-collapse: collapse; width: 100%; margin: 1.1rem 0; font-size: .95rem; display: block; overflow-x: auto; }
.bd th, .bd td { border: 1px solid var(--line); padding: .45rem .75rem; text-align: left; vertical-align: top; }
.bd th { background: var(--bg-2); color: var(--ink); }
.bd small { color: var(--mute); font-weight: 400; }
.bd-lbl { font: 600 .74rem Inter, sans-serif; text-transform: uppercase; letter-spacing: .07em; color: var(--mute); margin: .9rem 0 .35rem !important; display: block; }
.bd-note { font-size: .92rem; color: var(--mute); }
.bd-code, .bd pre { background: var(--bg-2); border: 1px solid var(--line); border-radius: 10px; padding: .85rem 1rem; overflow-x: auto; font: 500 .84rem/1.55 "JetBrains Mono", ui-monospace, Consolas, monospace; color: var(--ink); margin: 0 0 1rem; tab-size: 2; }
.bd pre code { background: none !important; border: 0 !important; padding: 0 !important; font: inherit; color: inherit; }
.bd-code code { font: inherit; }

/* botones y controles */
.bd-btn { display: inline-flex; align-items: center; gap: .4rem; font: 600 .95rem Inter, sans-serif; background: var(--accent); color: var(--accent-ink); border: 1px solid var(--accent); border-radius: 10px; padding: .55rem 1.1rem; cursor: pointer; text-decoration: none; }
.bd-btn:hover { filter: brightness(1.08); text-decoration: none; }
.bd-btn.ghost { background: transparent; color: var(--ink); border-color: var(--line); }
.bd-btn.ghost:hover { border-color: var(--accent); color: var(--accent); }
.bd-btn.small { padding: .3rem .75rem; font-size: .85rem; }
.bd-btn:disabled { opacity: .5; cursor: wait; }
.bd-btn.run { margin: -.4rem 0 1rem; }
.bd a.bd-btn { color: var(--accent-ink); } .bd a.bd-btn.ghost { color: var(--ink); }
.bd-sel { font: inherit; color: var(--ink); background: var(--bg-2); border: 1px solid var(--line); border-radius: 8px; padding: .35rem .5rem; max-width: 100%; }
.bd-chipsel { display: flex; flex-wrap: wrap; gap: .4rem; margin-bottom: .6rem; }
.bd-chip { font: 600 .82rem Inter, sans-serif; background: var(--bg-2); color: var(--ink-soft); border: 1px solid var(--line); border-radius: 99px; padding: .25rem .8rem; cursor: pointer; }
.bd-chip.is-on { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }
.bd-x { background: none; border: 1px solid var(--line); border-radius: 6px; color: var(--mute); cursor: pointer; padding: 0 .4rem; }
.bd-x:hover { color: #ef4444; border-color: #ef4444; }
.bd-win { background: rgba(34,197,94,.13); border: 1px solid #22c55e; border-radius: 10px; padding: .7rem 1rem; margin: .6rem 0; }
.bd-err { background: rgba(239,68,68,.12); border: 1px solid #ef4444; border-radius: 10px; padding: .7rem 1rem; margin: .6rem 0; font-size: .95rem; word-break: break-word; }
.bd-hint { background: rgba(250,204,21,.12); border-left: 4px solid #facc15; border-radius: 6px; padding: .5rem .8rem; margin: .5rem 0; font-size: .95rem; }
.bd-meter { height: 7px; background: var(--bg-2); border-radius: 99px; overflow: hidden; flex: 1; min-width: 60px; }
.bd-meter i { display: block; height: 100%; width: 0; background: var(--accent); transition: width .4s; }
.bd-tag { display: inline-block; font: 600 .72rem Inter, sans-serif; text-transform: uppercase; letter-spacing: .04em; background: var(--bg-2); color: var(--accent); border: 1px solid var(--line); border-radius: 6px; padding: 0 .45rem; margin-right: .3rem; }
.bd-tag.lv { color: var(--mute); }

/* portada y tarjetas */
.bd-hero-stats { display: flex; flex-wrap: wrap; gap: 1rem 2rem; margin: 0 0 1.6rem; }
.bd-cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: .9rem; margin: 0 0 1.6rem; }
.bd-card { display: block; border: 1px solid var(--line); background: var(--bg-card); border-radius: 14px; padding: 1rem 1.15rem; color: var(--ink-soft) !important; text-decoration: none !important; position: relative; }
.bd-card:hover { border-color: var(--accent); }
.bd-card b { display: block; color: var(--ink); margin-bottom: .2rem; }
.bd-card small { display: block; line-height: 1.4; }
.bd-card .ck { position: absolute; top: .7rem; right: .8rem; width: 20px; height: 20px; border-radius: 50%; border: 2px solid var(--line); display: grid; place-items: center; font-size: 12px; color: transparent; }
.bd-card.is-done .ck { background: #22c55e; border-color: #22c55e; color: #fff; }
.bd-card.is-done .ck::after { content: "✓"; }
.bd-prog { display: flex; align-items: center; gap: .6rem; margin: .5rem 0 1rem; font-size: .85rem; color: var(--mute); }
.bd-prog b { min-width: 11ch; color: var(--ink); font-weight: 600; }
.bd-nav { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; margin: 2.2rem 0 1rem; }
.bd-navbtn { display: block; border: 1px solid var(--line); background: var(--bg-card); border-radius: 12px; padding: .85rem 1.05rem; color: var(--ink) !important; text-decoration: none !important; }
.bd-navbtn:hover { border-color: var(--accent); } .bd-navbtn span { display: block; font-size: .8rem; color: var(--mute); }
.bd-navbtn:nth-child(2) { text-align: right; }
.bd-toc { background: var(--bg-2); border: 1px solid var(--line); border-radius: 12px; padding: .9rem 1.2rem; margin: 0 0 1.5rem; }
.bd-toc ul { list-style: none; margin: 0; padding: 0; columns: 2 16rem; } .bd-toc li { margin: 0 0 .3rem; }

/* quiz */
.bd-q { background: var(--bg-card); border: 1px solid var(--line); border-radius: 14px; padding: 1.2rem; }
.bd-q-bar { height: 6px; background: var(--bg-2); border-radius: 99px; overflow: hidden; margin-bottom: 1rem; }
.bd-q-bar i { display: block; height: 100%; background: var(--accent); transition: width .3s; }
.bd-q-t { font-size: 1.15rem; color: var(--ink); font-weight: 600; margin-bottom: .9rem; }
.bd-opt { display: block; width: 100%; text-align: left; font: inherit; color: var(--ink); background: var(--bg-2); border: 2px solid var(--line); border-radius: 10px; padding: .6rem .9rem; margin-bottom: .5rem; cursor: pointer; }
.bd-opt:hover:not(:disabled) { border-color: var(--accent); } .bd-opt:disabled { cursor: default; }
.bd-opt.good { border-color: #22c55e; background: rgba(34,197,94,.12); } .bd-opt.bad { border-color: #ef4444; background: rgba(239,68,68,.12); }
.bd-fb { margin: .6rem 0; padding: .7rem 1rem; background: var(--bg-2); border-radius: 10px; }
.bd-score { text-align: center; } .bd-score b { display: block; font-size: 2.6rem; color: var(--ink); }

/* teoría: autoevaluación */
.bd-resp textarea { width: 100%; background: var(--bg-2); color: var(--ink); border: 1px solid var(--line); border-radius: 10px; padding: .8rem 1rem; font: 1rem/1.55 Inter, sans-serif; resize: vertical; }
.bd-resp-bar { display: flex; align-items: center; gap: .8rem; margin: .5rem 0; font-size: .9rem; color: var(--mute); }
.bd-resp-bar .ok { color: #22c55e; font-weight: 600; }
.bd-chips { list-style: none; margin: 0 0 1rem !important; padding: 0; display: flex; flex-wrap: wrap; gap: .4rem; }
.bd-chips li { font-size: .82rem; border: 1px solid var(--line); border-radius: 99px; padding: .15rem .7rem; color: var(--mute); margin: 0; }
.bd-chips li.ok { color: #22c55e; border-color: #22c55e; background: rgba(34,197,94,.1); }
details.bd-det { background: var(--bg-card); border: 1px solid var(--line); border-radius: 12px; padding: .2rem 1rem; margin: 1rem 0; }
details.bd-det > summary { cursor: pointer; font-weight: 600; color: var(--accent); padding: .6rem 0; }

/* diagramas ER */
.er-diagram { overflow-x: auto; background: var(--bg-2); border: 1px solid var(--line); border-radius: 12px; padding: .6rem; margin: .6rem 0 1rem; }
.er-svg { width: 100%; height: auto; min-width: 560px; display: block; margin: 0 auto; }
.er-line { stroke: var(--ink-soft); stroke-width: 1.4; fill: none; }
.er-ent rect { fill: var(--bg-card); stroke: var(--ink); stroke-width: 1.8; }
.er-rel polygon { fill: var(--bg-card); stroke: var(--accent); stroke-width: 1.8; }
.er-att ellipse { fill: var(--bg-card); stroke: var(--ink-soft); stroke-width: 1.3; }
.er-t { fill: var(--ink); font: 12px Inter, system-ui, sans-serif; text-anchor: middle; dominant-baseline: central; }
.er-name { font-weight: 700; font-size: 14px; } .er-rname { fill: var(--accent); font-size: 11.5px; font-weight: 600; }
.er-card { fill: var(--accent); font: 600 11px "JetBrains Mono", monospace; text-anchor: middle; dominant-baseline: central; }
.er-role { fill: var(--mute); font: italic 11px Inter, sans-serif; text-anchor: middle; }
.er-key text { text-decoration: underline; } .er-part text { text-decoration: underline dashed; }
.er-derived ellipse { stroke-dasharray: 5 3; }
.er-enun { background: var(--bg-2); border-left: 4px solid var(--accent); padding: .8rem 1rem; border-radius: 0 10px 10px 0; font-size: 1rem; }
details.er-card-ex { background: var(--bg-card); border: 1px solid var(--line); border-radius: 14px; margin: .9rem 0; }
details.er-card-ex > summary { cursor: pointer; padding: .9rem 1.1rem; font-weight: 600; color: var(--ink); display: flex; gap: .7rem; align-items: center; list-style: none; }
details.er-card-ex > summary::-webkit-details-marker { display: none; }
details.er-card-ex .st { width: 20px; height: 20px; border-radius: 50%; border: 2px solid var(--line); flex: none; display: grid; place-items: center; font-size: 12px; color: transparent; }
details.er-card-ex.is-done .st { background: #22c55e; border-color: #22c55e; color: #fff; } details.er-card-ex.is-done .st::after { content: "✓"; }
.er-card-body { padding: 0 1.1rem 1.1rem; border-top: 1px solid var(--line); }
.er-step { border: 1px solid var(--line); border-radius: 12px; padding: .8rem 1rem; margin: .9rem 0; background: var(--bg-card); }
.er-step h4 { margin: 0 0 .6rem; } .er-step h4 small { display: block; font-size: .8rem; margin-top: .15rem; }
.er-grid { display: grid; gap: .5rem; }
.er-row { display: flex; flex-wrap: wrap; align-items: center; gap: .6rem; padding: .35rem .6rem; border: 1px solid var(--line); border-radius: 8px; }
.er-row.is-ok { border-color: #22c55e; background: rgba(34,197,94,.08); } .er-row.is-bad { border-color: #ef4444; background: rgba(239,68,68,.08); }
.er-row > span:first-child, .er-row > code { min-width: 9rem; } .er-res { font-size: .85rem; color: var(--mute); }
.er-row.is-ok .er-res { color: #22c55e; } .er-row.is-bad .er-res { color: #ef4444; }
.er-ends { display: flex; flex-wrap: wrap; gap: .6rem 1.2rem; } .er-ends label { display: flex; gap: .4rem; align-items: center; }
.er-sum.ok { color: #22c55e; font-weight: 600; } .er-sum.bad { color: #ef4444; }
.er-notes { margin-top: .8rem; }

/* modelo relacional */
.rel-tables { display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); gap: .9rem; margin: .8rem 0; }
.rel-t { border: 1px solid var(--line); background: var(--bg-card); border-radius: 12px; padding: .7rem .8rem; }
.rel-th { display: flex; gap: .4rem; margin-bottom: .5rem; }
.rel-t input[type=text], .rel-t input:not([type]) { font: 500 .9rem "JetBrains Mono", monospace; color: var(--ink); background: var(--bg-2); border: 1px solid var(--line); border-radius: 6px; padding: .25rem .4rem; width: 100%; min-width: 0; }
.rel-tn { font-weight: 700 !important; text-transform: uppercase; }
.rel-cols { display: table !important; margin: 0 0 .5rem !important; font-size: .85rem; } .rel-cols th, .rel-cols td { padding: .2rem .3rem; border: 0; background: none; }
.rel-cols th { font-size: .72rem; text-transform: uppercase; color: var(--mute); } .rel-cols select { max-width: 9rem; }
.k-pk { text-decoration: underline; } .k-fk { font-style: italic; border-bottom: 1px dotted var(--accent); color: var(--accent); }
.rel-sol { list-style: none !important; margin-left: 0 !important; } .rel-sol li { margin-bottom: .5rem; } .rel-sol code { font-size: .95rem; background: var(--bg-2); padding: .3rem .6rem; border-radius: 8px; display: inline-block; }
.rel-list { list-style: none !important; margin-left: 0 !important; } .rel-list.bad li { color: #f87171; } .rel-list.ok li { color: #22c55e; }
:root[data-theme="light"] .rel-list.bad li { color: #b91c1c; } :root[data-theme="light"] .rel-list.ok li { color: #15803d; }
.rel-score { display: flex; align-items: center; gap: .8rem; margin: .8rem 0; }

/* SQL */
.sql-filter { display: grid; gap: .4rem 2rem; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); }
details.sql-ex { background: var(--bg-card); border: 1px solid var(--line); border-radius: 12px; margin: .55rem 0; }
details.sql-ex > summary { cursor: pointer; padding: .7rem 1rem; color: var(--ink); display: flex; gap: .4rem; align-items: baseline; list-style: none; font-size: .96rem; }
details.sql-ex > summary::-webkit-details-marker { display: none; }
details.sql-ex .st { width: 18px; height: 18px; border-radius: 50%; border: 2px solid var(--line); flex: none; align-self: center; display: grid; place-items: center; font-size: 11px; color: transparent; }
details.sql-ex.is-done .st { background: #22c55e; border-color: #22c55e; color: #fff; } details.sql-ex.is-done .st::after { content: "✓"; }
.sql-body { padding: 0 1rem 1rem; border-top: 1px solid var(--line); } .sql-en { font-size: 1.02rem; color: var(--ink); margin: .8rem 0 .4rem; }
.sql-ta { width: 100%; min-height: 110px; background: var(--bg-2); color: var(--ink); border: 1px solid var(--line); border-radius: 8px; padding: .6rem .8rem; font: 500 .9rem "JetBrains Mono", monospace; }
.sql-btns { display: flex; flex-wrap: wrap; gap: .5rem; align-items: center; margin: .6rem 0 !important; }
.sql-body .CodeMirror, .sql-sand .CodeMirror { height: auto; min-height: 96px; border: 1px solid var(--line); border-radius: 8px; font: 500 .9rem/1.5 "JetBrains Mono", monospace; }
.sql-tbl { overflow-x: auto; margin: .5rem 0; } .sql-tbl table { display: table; width: auto; min-width: 40%; font-size: .85rem; margin: 0; }
.sql-tbl td.null { color: var(--mute); font-style: italic; }
.sql-schema { display: grid; grid-template-columns: repeat(auto-fill, minmax(190px, 1fr)); gap: .6rem; margin: .5rem 0 1rem; }
.sql-t { border: 1px solid var(--line); border-radius: 8px; background: var(--bg-card); overflow: hidden; font-size: .82rem; }
.sql-tn { background: var(--bg-2); color: var(--ink); font-weight: 700; padding: .25rem .6rem; text-transform: uppercase; font-size: .78rem; }
.sql-c { padding: .12rem .6rem; font-family: "JetBrains Mono", monospace; color: var(--ink-soft); } .sql-c small { color: var(--mute); font-size: .72rem; }
.sql-c.pk { text-decoration: underline; color: var(--ink); } .sql-c.fk { font-style: italic; color: var(--accent); }
.sql-aux { margin: .4rem 0; max-height: 420px; overflow: auto; }
.sql-sand .sql-out { margin-top: .5rem; }

/* simulacro */
.sim-bar { position: sticky; top: 64px; z-index: 5; display: flex; justify-content: space-between; align-items: center; gap: 1rem; background: var(--bg-card); border: 1px solid var(--line); border-radius: 12px; padding: .5rem 1rem; margin: 0 0 1rem; }
.sim-sec { border: 1px solid var(--line); border-radius: 14px; padding: .2rem 1.2rem 1rem; margin: 1.2rem 0; background: var(--bg-card); }
.sim-q { margin: 1rem 0; } .sim-q textarea { width: 100%; background: var(--bg-2); color: var(--ink); border: 1px solid var(--line); border-radius: 10px; padding: .7rem .9rem; font: 1rem/1.5 Inter, sans-serif; }
.sim-check { list-style: none !important; margin-left: 0 !important; } .sim-check li { margin-bottom: .35rem; }
.sim-res table { display: table; } .sim-res .big { color: var(--accent); font-size: 1.6em; }
.sim-hist { margin-left: 1.2rem; }

@media print {
  .nav, .nav-mobile, .footer, .skip-link, .scroll-progress, .cursor, .toast-stack, .back-to-top, .bd-nav, .article-header .article-meta, .crumbs, .no-print { display: none !important; }
  body { background: #fff !important; color: #000 !important; } .bd, .bd * { color: #000 !important; background: transparent !important; border-color: #888 !important; }
  .bd { max-width: none; font-size: 10pt; } .bd h2 { font-size: 13pt; margin-top: 1rem; } .article-title { color: #000 !important; font-size: 18pt; }
  .bd pre { white-space: pre-wrap; } .chu-grid { columns: 2; column-gap: 1.2rem; }
}
.chu-grid { columns: 2 330px; column-gap: 1.4rem; } .chu-grid > section { break-inside: avoid; margin-bottom: 1rem; border: 1px solid var(--line); border-radius: 10px; padding: .6rem 1rem; background: var(--bg-card); }
.chu-grid h3 { margin-top: .2rem; font-size: 1.05rem; } .chu-grid ul { margin-bottom: .6rem; }

@media (max-width: 700px) { .bd-nav { grid-template-columns: 1fr; } .bd-navbtn:nth-child(2) { text-align: left; } .sim-bar { top: 56px; } }