@import url("https://fonts.googleapis.com/css2?family=Atkinson+Hyperlegible:wght@400;700&display=swap");

:root {
  color-scheme: light;
  --ink: #29251d;
  --muted: #6d675d;
  --paper: #fffdf8;
  --canvas: #f4f0e6;
  --gold: #e3b62f;
  --gold-dark: #8a6a00;
  --gold-soft: #fff4cb;
  --line: #ddd5c5;
  --green: #226548;
  --green-soft: #e4f3e9;
  --red: #a33b2b;
  --red-soft: #fff0ec;
  --code: #211f1a;
  --page-width: 1600px;
  --gutter: clamp(16px, 4vw, 64px);
}

* { box-sizing: border-box; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--canvas);
  font-family: "Atkinson Hyperlegible", "Trebuchet MS", system-ui, sans-serif;
  line-height: 1.5;
}
button, textarea { font: inherit; }
code, kbd, textarea { font-family: ui-monospace, SFMono-Regular, Consolas, "Liberation Mono", monospace; }
code { padding: 0 3px; background: #f3ecd9; border-radius: 4px; font-size: .9em; }
kbd { padding: 1px 5px; background: #f4f0e7; border: 1px solid var(--line); border-radius: 4px; font-size: .8rem; }
a { color: #6c5200; }
a:hover { color: #392900; }

.page-header { padding: 30px 0 24px; color: #fffdf8; background: #302a1d; border-bottom: 6px solid var(--gold); }
.header-inner, main { width: min(var(--page-width), 100%); margin: 0 auto; padding: 0 var(--gutter); }
.eyebrow { margin: 0 0 5px; color: #f1d982; font-size: .8rem; font-weight: 700; letter-spacing: .09em; text-transform: uppercase; }
h1 { margin: 0; font-size: clamp(1.9rem, 4vw, 3rem); line-height: 1.1; }
.intro { max-width: 900px; margin: 12px 0 0; color: #eee7d8; font-size: 1.08rem; }
main { padding-top: 24px; padding-bottom: 52px; }
h2 { margin: 0; font-size: 1.35rem; line-height: 1.2; }
h3 { margin: 0; font-size: 1.02rem; }
p { margin: 10px 0 0; }
ul, ol { margin: 8px 0 0; padding-left: 22px; }
li + li { margin-top: 4px; }
details { margin-top: 14px; }
summary { cursor: pointer; font-weight: 700; }

.panel { min-width: 0; padding: 20px; background: var(--paper); border: 1px solid var(--line); border-radius: 12px; box-shadow: 0 2px 6px #29251d0a; }
.panel + .panel, .workspace + .panel { margin-top: 18px; }
.panel-heading { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 8px 14px; }
.help, .muted, .references { color: var(--muted); font-size: .92rem; }
.references { margin-top: 18px; }

/* Planteamiento */
.problem-grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.15fr); gap: 20px; align-items: start; margin-top: 4px; }
.problem h3 { margin-top: 18px; }
.options { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 10px; padding: 0; list-style: none; }
.options li { margin: 0; padding: 12px 13px; background: #faf5e9; border-left: 4px solid var(--gold); border-radius: 6px; font-size: .95rem; }
.options li:nth-child(3), .options li:nth-child(4) { border-left-color: var(--green); }
.options li:first-child { border-left-color: var(--red); }

/* Tablas: mismo aspecto que la práctica de SQL */
.table-wrap { max-width: 100%; overflow: auto; border: 1px solid var(--line); border-radius: 7px; }
table { width: 100%; border-collapse: collapse; font-size: .91rem; }
caption { padding: 8px 10px; color: var(--muted); font-weight: 700; text-align: left; }
th, td { padding: 7px 10px; text-align: left; vertical-align: top; border-bottom: 1px solid #e9e3d8; }
th { position: sticky; top: 0; color: #3d3526; background: #f1e7c9; font-weight: 800; }
tr:last-child td { border-bottom: 0; }
td { max-width: 560px; overflow-wrap: anywhere; }
td.null { color: #82796a; font-style: italic; }
.plain-table th { position: static; }

/* Datos */
.button-row { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 14px; }
.button { min-height: 40px; padding: 8px 13px; color: var(--ink); background: #f5f0e4; border: 1px solid #cfc4ad; border-radius: 8px; font-weight: 700; cursor: pointer; }
.button:hover:not(:disabled) { background: #eee4ca; }
.button:disabled { opacity: .55; cursor: wait; }
.button.primary { color: #fffdf8; background: #6c5200; border-color: #6c5200; }
.button.primary:hover { background: #523d00; }
.button.subtle { color: #554300; background: #fff8dc; }
.button.small { min-height: 32px; padding: 4px 10px; font-size: .88rem; }
.button:focus-visible, textarea:focus, .CodeMirror-focused { outline: 3px solid #e3b62f80; outline-offset: 2px; }
.status { display: inline-flex; align-items: center; min-height: 30px; padding: 3px 10px; color: #554300; background: var(--gold-soft); border: 1px solid #e8d58f; border-radius: 999px; font-size: .88rem; font-weight: 700; }
.status.ready { color: #174d36; background: var(--green-soft); border-color: #acd4ba; }
.status.error { color: #7e281e; background: var(--red-soft); border-color: #e7b7ac; }
.source-columns { display: grid; grid-template-columns: max-content 1fr; gap: 4px 14px; margin: 10px 0 0; font-size: .92rem; }
.source-columns dt { font-weight: 700; }
.source-columns dd { margin: 0; color: var(--muted); }

/* Navegación de ejercicios */
.exercise-nav { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 20px; }
.tab[aria-current="step"], .tab[aria-selected="true"] { color: #fffdf8; background: #302a1d; border-color: #302a1d; }

/* Espacio de trabajo */
.workspace { display: grid; grid-template-columns: minmax(0, .9fr) minmax(0, 1.1fr); gap: 18px; align-items: start; margin-top: 14px; }
.exercise-heading { display: flex; align-items: center; gap: 12px; }
.number { display: grid; flex: 0 0 36px; width: 36px; height: 36px; place-items: center; color: #352b0e; background: #f5df91; border-radius: 50%; font-weight: 800; }
.brief { display: grid; gap: 10px; margin-top: 14px; }
.brief-block { padding: 11px 14px; background: #faf7ef; border: 1px solid #ece4d2; border-radius: 9px; }
.brief-block h3 { color: var(--gold-dark); font-size: .8rem; letter-spacing: .06em; text-transform: uppercase; }
.brief-block p, .brief-block ol, .brief-block ul { margin-top: 5px; }
.brief-block.task { background: #fffaf0; border-color: #e8d58f; }
.brief-block.expected { background: var(--green-soft); border-color: #cfe6d6; }
.brief-block.expected h3 { color: var(--green); }
.editor-label { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 4px 12px; margin-top: 16px; color: var(--muted); font-size: .88rem; font-weight: 700; }
textarea { display: block; width: 100%; min-height: 240px; margin-top: 6px; padding: 13px; resize: vertical; color: #f8f4e9; background: var(--code); border: 1px solid #11100d; border-radius: 8px; line-height: 1.45; }
.CodeMirror { min-height: 240px; max-height: 480px; height: auto; margin-top: 6px; border: 1px solid #11100d; border-radius: 8px; font: 14px/1.5 ui-monospace, SFMono-Regular, Consolas, "Liberation Mono", monospace; }
.CodeMirror-scroll { min-height: 240px; max-height: 480px; }
.message { min-height: 1.5em; white-space: pre-wrap; }
.message.error { color: var(--red); font-weight: 700; }
.message.success { color: var(--green); font-weight: 700; }

/* Clúster */
.table-tabs { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 12px; }
.table-schema { font-size: .92rem; font-weight: 700; overflow-wrap: anywhere; }
.nodes { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; margin-top: 12px; }
.node { min-width: 0; padding: 10px 11px; background: #fffefa; border: 2px solid #e6dcc6; border-radius: 12px; transition: opacity .2s, border-color .2s; }
.node.contacted { border-color: var(--gold-dark); box-shadow: 0 0 0 3px #e3b62f55; }
.node.idle { opacity: .5; }
.node-heading { display: flex; align-items: baseline; justify-content: space-between; gap: 8px; }
.node-heading .muted { font-size: .8rem; }
.load { height: 6px; margin-top: 6px; background: #efe8d8; border-radius: 3px; overflow: hidden; }
.load-bar { display: block; height: 100%; background: var(--gold-dark); }
.load-text { margin-top: 4px; color: var(--muted); font-size: .82rem; }
.cells { display: flex; flex-wrap: wrap; align-content: flex-start; gap: 3px; max-height: 300px; margin-top: 8px; overflow: auto; }
.partition { display: inline-flex; flex-wrap: wrap; gap: 1px; padding: 1px; border-radius: 3px; }
.partition .cell { width: 6px; height: 6px; background: var(--partition-color); border-radius: 1px; }
.cells.detailed .partition .cell { width: 12px; height: 12px; border-radius: 2px; }
.partition.read { outline: 2px solid var(--ink); outline-offset: 1px; }
.partition.dim { opacity: .18; }
.legend { margin-top: 14px; }
.legend h3 { font-size: .92rem; }
.legend-list { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 3px 16px; padding: 0; list-style: none; font-size: .88rem; }
.legend-list li { display: flex; align-items: center; gap: 6px; margin: 0; min-width: 0; overflow-wrap: anywhere; }
.swatch { flex: 0 0 12px; width: 12px; height: 12px; border-radius: 2px; }

/* Resultado */
.statement-log { margin: 12px 0 0; padding-left: 20px; color: var(--muted); font-size: .92rem; }
.statement-log:empty { display: none; }
.access { margin-top: 14px; padding: 12px 14px; border-radius: 9px; background: #faf5e9; }
.access.direct { background: var(--green-soft); }
.access.index { background: var(--gold-soft); }
.access.costly { background: var(--red-soft); }
.metrics { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 10px; }
.metric { display: flex; flex-direction: column; }
.metric-value { font-size: 1.45rem; font-weight: 700; line-height: 1.1; }
.metric-label { color: var(--muted); font-size: .82rem; }
.access-reason { margin-top: 8px; }
.result-table { margin-top: 14px; }
.result-table .table-wrap { max-height: 460px; }
.empty { color: var(--muted); }
.pagination { display: flex; align-items: center; justify-content: center; gap: 12px; margin-top: 10px; }
.pagination[hidden] { display: none; }

@media (max-width: 1100px) {
  .problem-grid { grid-template-columns: 1fr; }
  .options { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 900px) { .workspace { grid-template-columns: 1fr; } }
@media (max-width: 560px) {
  .panel { padding: 15px; }
  .options, .nodes, .legend-list { grid-template-columns: 1fr; }
  .metrics { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .button { flex: 1 1 45%; }
}