/* Tema oscuro por defecto: fondos azul noche, sin negro ni blanco puros, para cansar menos la vista.
   El tema claro se activa con data-theme="light" (interruptor de la barra superior). */
:root {
  color-scheme: dark;
  --page: #0a0e15;
  --surface-1: #131a26;
  --surface-2: #1a2231;
  --surface-3: #232d40;
  --text-primary: #e5e9f0;
  --text-secondary: #a4adbd;
  --text-muted: #6e7a8f;
  --grid: #202a3b;
  --axis: #2f3a4f;
  --border: rgba(148, 163, 184, 0.13);
  --shadow: 0 1px 0 rgba(255, 255, 255, .03) inset, 0 12px 32px rgba(0, 0, 0, .35);
  --topbar: rgba(12, 17, 26, .82);
  --accent: #4f8cff;
  --accent-2: #7a5cff;
  --accent-soft: rgba(79, 140, 255, .14);
  --focus: rgba(79, 140, 255, .45);

  --series-1: #3987e5;
  --series-2: #d95926;
  --series-3: #199e70;

  --good: #22c55e;
  --warning: #f5b83d;
  --critical: #ef4f4f;
  --good-text: #4ade80;
  --bad-text: #f87171;
}

:root[data-theme="light"] {
  color-scheme: light;
  --page: #f3f5f9;
  --surface-1: #ffffff;
  --surface-2: #eef1f6;
  --surface-3: #e3e8f0;
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #8a94a6;
  --grid: #e3e7ee;
  --axis: #cbd2dc;
  --border: rgba(15, 23, 42, 0.09);
  --shadow: 0 1px 2px rgba(15, 23, 42, .04), 0 8px 24px rgba(15, 23, 42, .06);
  --topbar: rgba(255, 255, 255, .85);
  --accent: #2a78d6;
  --accent-2: #5b5bd6;
  --accent-soft: rgba(42, 120, 214, .10);
  --focus: rgba(42, 120, 214, .35);
  --series-1: #2a78d6;
  --series-2: #eb6834;
  --series-3: #1baf7a;
  --good: #0ca30c;
  --warning: #e6a100;
  --critical: #d03b3b;
  --good-text: #006300;
  --bad-text: #c02f2f;
}

* { box-sizing: border-box; }
html, body {
  margin: 0;
  background: var(--page);
  color: var(--text-primary);
  font: 14px/1.5 "Segoe UI Variable Text", "Segoe UI", system-ui, -apple-system, sans-serif;
  -webkit-font-smoothing: antialiased;
}
body { transition: background-color .2s ease, color .2s ease; }
::selection { background: var(--accent-soft); }
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--axis); border: 2px solid var(--page); border-radius: 8px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }
[hidden] { display: none !important; }
h1 { font-size: 22px; font-weight: 600; margin: 0 0 2px; }
h2 { font-size: 15px; font-weight: 600; margin: 0; }
p { margin: 4px 0; }
code { background: var(--surface-2); padding: 1px 5px; border-radius: 4px; }
.muted { color: var(--text-secondary); }
.small { font-size: 12px; }
.up { color: var(--good-text); }
.down { color: var(--bad-text); }

/* ---------- barra superior ---------- */
.topbar {
  position: sticky; top: 0; z-index: 10;
  display: flex; align-items: center; gap: 24px;
  padding: 10px 24px;
  background: var(--topbar);
  backdrop-filter: saturate(160%) blur(14px);
  border-bottom: 1px solid var(--border);
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 650; font-size: 15px; letter-spacing: -.01em; white-space: nowrap; }
.logo {
  width: 30px; height: 30px; padding: 6px; border-radius: 9px; color: #fff;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  box-shadow: 0 6px 16px rgba(79, 140, 255, .28);
}
.tabs { display: flex; gap: 2px; padding: 4px; border-radius: 12px; background: var(--surface-2); border: 1px solid var(--border); }
.tabs button {
  border: 0; background: transparent; color: var(--text-secondary);
  padding: 6px 14px; border-radius: 9px; font: inherit; font-weight: 500; cursor: pointer;
  transition: background-color .15s ease, color .15s ease;
}
.tabs button:hover { color: var(--text-primary); background: var(--surface-3); }
.tabs button.active {
  color: #fff; font-weight: 600;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  box-shadow: 0 4px 14px rgba(79, 140, 255, .25);
}
.tabs button:focus-visible { outline: none; box-shadow: 0 0 0 3px var(--focus); }
.topbar-right { margin-left: auto; display: flex; align-items: center; gap: 12px; white-space: nowrap; }
.mode-badge {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 11px; font-weight: 700; letter-spacing: .06em;
  padding: 5px 11px; border-radius: 999px; border: 1px solid var(--border);
  background: var(--surface-2); color: var(--text-secondary);
}
.mode-badge::before { content: ""; width: 7px; height: 7px; border-radius: 50%; background: var(--good); }
.mode-badge.live { background: rgba(239, 79, 79, .16); border-color: rgba(239, 79, 79, .5); color: var(--bad-text); }
.mode-badge.live::before { background: var(--critical); box-shadow: 0 0 0 3px rgba(239, 79, 79, .25); }
.theme-toggle {
  display: grid; place-items: center; width: 34px; height: 34px; padding: 0;
  border-radius: 10px; border: 1px solid var(--border); background: var(--surface-2); color: var(--text-secondary);
  cursor: pointer; transition: background-color .15s ease, color .15s ease;
}
.theme-toggle:hover { background: var(--surface-3); color: var(--text-primary); }
.theme-toggle svg { width: 17px; height: 17px; }
.banner { background: var(--critical); color: #fff; padding: 8px 24px; text-align: center; }

/* ---------- estructura ---------- */
main { max-width: 1440px; margin: 0 auto; padding: 20px 24px 48px; }
.view { display: flex; flex-direction: column; gap: 16px; }
.view-head { display: flex; justify-content: space-between; align-items: flex-end; gap: 16px; flex-wrap: wrap; }
.row { display: grid; gap: 16px; }
.row-top { grid-template-columns: 1.1fr 1.35fr 1fr; }
.row-main { grid-template-columns: 1.3fr 1fr; }
.row-2 { grid-template-columns: 1fr 1fr; }
@media (max-width: 1100px) { .row-top, .row-main, .row-2 { grid-template-columns: 1fr; } }

.card {
  background: var(--surface-1);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 18px 20px;
  box-shadow: var(--shadow);
  min-width: 0;
}
.card-head { display: flex; justify-content: space-between; align-items: flex-start; gap: 12px; margin-bottom: 10px; }
.sub-head { margin: 16px 0 4px; }

/* ---------- cifras ---------- */
.label { color: var(--text-secondary); font-size: 12px; }
.hero { display: block; font-size: 48px; font-weight: 600; line-height: 1.1; margin: 4px 0 6px; }
.delta { font-weight: 500; }
.tiles { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; margin-top: 14px; padding-top: 12px; border-top: 1px solid var(--grid); }
.tile .value { display: block; font-size: 20px; font-weight: 600; margin-top: 2px; }
.tiles-row { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
@media (max-width: 900px) { .tiles-row { grid-template-columns: repeat(2, 1fr); } }
.stat .value { display: block; font-size: 28px; font-weight: 600; margin: 4px 0 2px; }

.bot-status, .regime { display: flex; align-items: center; gap: 8px; font-weight: 600; margin: 2px 0 6px; }
.bot-status { font-size: 22px; }
.regime { font-size: 16px; }
.status-icon { font-size: 14px; line-height: 1; }
.status-icon.good { color: var(--good); }
.status-icon.warning { color: var(--warning); }
.status-icon.critical { color: var(--critical); }
.status-icon.off { color: var(--text-muted); }

/* ---------- botones ---------- */
.actions { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 14px; }
.actions.right { justify-content: flex-end; }
.actions.inline { margin-top: 0; align-items: center; }
.select {
  font: inherit; padding: 7px 10px; border-radius: 8px;
  border: 1px solid var(--axis); background: var(--surface-1); color: var(--text-primary);
}
.notice {
  margin: 0; padding: 10px 12px; border-radius: 8px; color: var(--text-primary);
  background: color-mix(in srgb, var(--warning) 14%, transparent);
  border: 1px solid color-mix(in srgb, var(--warning) 45%, transparent);
}
.card .notice { margin-top: 14px; }
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  font: inherit; font-weight: 600; letter-spacing: .01em;
  padding: 9px 16px; border-radius: 10px;
  border: 1px solid var(--border); background: var(--surface-2); color: var(--text-primary);
  cursor: pointer;
  transition: background-color .15s ease, border-color .15s ease, box-shadow .15s ease, transform .1s ease, filter .15s ease;
}
.btn:hover:not(:disabled) { background: var(--surface-3); border-color: color-mix(in srgb, var(--accent) 35%, var(--border)); }
.btn:active:not(:disabled) { transform: translateY(1px) scale(.99); }
.btn:focus-visible { outline: none; box-shadow: 0 0 0 3px var(--focus); }
.btn:disabled { opacity: .4; cursor: not-allowed; box-shadow: none; }
.btn.primary {
  color: #fff; border-color: transparent;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  box-shadow: 0 6px 18px rgba(79, 140, 255, .28);
}
.btn.primary:hover:not(:disabled) { filter: brightness(1.1); box-shadow: 0 8px 24px rgba(79, 140, 255, .38); }
.btn.ghost { background: transparent; border-color: transparent; color: var(--text-secondary); }
.btn.ghost:hover:not(:disabled) { background: var(--surface-2); color: var(--text-primary); border-color: transparent; }
.btn.small { padding: 5px 11px; font-size: 12px; border-radius: 8px; }
.btn.danger { color: var(--bad-text); background: rgba(239, 79, 79, .10); border-color: rgba(239, 79, 79, .35); }
.btn.danger:hover:not(:disabled) { background: rgba(239, 79, 79, .18); border-color: rgba(239, 79, 79, .55); }
.error {
  color: var(--bad-text);
  background: color-mix(in srgb, var(--critical) 9%, transparent);
  padding: 8px 10px; border-radius: 8px;
}

/* ---------- tablas ---------- */
.table-wrap { overflow-x: auto; }
.table-wrap.tall { max-height: 420px; overflow-y: auto; }
.table-wrap + .table-wrap { margin-top: 18px; }
.table { width: 100%; border-collapse: collapse; }
.table th {
  position: sticky; top: 0; background: var(--surface-1);
  text-align: left; font-weight: 500; font-size: 12px; color: var(--text-secondary);
  padding: 6px 8px; border-bottom: 1px solid var(--axis); white-space: nowrap;
}
.table td { padding: 8px; border-bottom: 1px solid var(--grid); white-space: nowrap; }
.table .num { text-align: right; font-variant-numeric: tabular-nums; }
.table tr.total td { font-weight: 600; border-bottom: 0; }
.table td.empty { text-align: center; color: var(--text-secondary); padding: 24px 8px; }
.coin { font-weight: 600; }

.meter {
  position: relative; display: inline-block; vertical-align: middle;
  width: 110px; height: 8px; margin-right: 8px;
  background: var(--grid); border-radius: 4px;
}
.meter > span { position: absolute; inset: 0 auto 0 0; background: var(--series-1); border-radius: 4px; }
.meter > i { position: absolute; top: -4px; bottom: -4px; width: 2px; margin-left: -1px; background: var(--text-primary); border-radius: 1px; }
.legend-line { display: flex; align-items: center; gap: 6px; margin-top: 10px; }
.key-bar { display: inline-block; width: 16px; height: 8px; border-radius: 4px; background: var(--series-1); }
.key-tick { display: inline-block; width: 2px; height: 14px; margin-left: 12px; background: var(--text-primary); }

/* ---------- gráficos ---------- */
.chart { width: 100%; }
.h240 { height: 240px; }
.h280 { height: 280px; }
.h320 { height: 320px; }
.h420 { height: 420px; }
.empty { color: var(--text-secondary); text-align: center; padding: 48px 12px; }
.notes { margin: 6px 0 0; padding-left: 18px; }
.notes li { margin: 8px 0; }

/* ---------- registro ---------- */
.log {
  margin: 0; padding: 12px; border-radius: 8px;
  background: var(--surface-2); color: var(--text-primary);
  font: 12px/1.5 ui-monospace, Consolas, monospace;
  max-height: 420px; overflow: auto; white-space: pre-wrap;
}
.log.short { max-height: 260px; }

/* ---------- ajustes ---------- */
.form { display: flex; flex-direction: column; gap: 14px; max-width: 440px; }
.form label { display: flex; flex-direction: column; gap: 4px; font-size: 13px; color: var(--text-secondary); }
.form input:not([type=radio]):not([type=checkbox]), .form select, dialog input, .select, .glossary-search {
  font: inherit; padding: 9px 12px; border-radius: 10px;
  border: 1px solid var(--border); background: var(--surface-2); color: var(--text-primary);
  transition: border-color .15s ease, box-shadow .15s ease;
}
.form input:focus, .form select:focus, dialog input:focus, .select:focus, .glossary-search:focus {
  outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px var(--focus);
}
input[type=checkbox], input[type=radio] { accent-color: var(--accent); width: 16px; height: 16px; }
.form fieldset { border: 0; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 6px; }
.form legend { font-size: 13px; color: var(--text-secondary); margin-bottom: 4px; }
.form .radio { flex-direction: row; align-items: center; gap: 8px; color: var(--text-primary); }
.hint { font-size: 12px; color: var(--text-muted); }
hr { border: 0; border-top: 1px solid var(--grid); margin: 18px 0; }
.params { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 0 24px; }
.params div { display: flex; justify-content: space-between; gap: 12px; padding: 7px 0; border-bottom: 1px solid var(--grid); font-size: 13px; }
.params div.wide { grid-column: 1 / -1; }
.params span:first-child { color: var(--text-secondary); }
.params span:last-child { text-align: right; font-variant-numeric: tabular-nums; }

/* ---------- diálogo y avisos ---------- */
dialog {
  width: min(460px, 92vw); padding: 22px;
  border: 1px solid var(--border); border-radius: 16px;
  background: var(--surface-1); color: var(--text-primary);
  box-shadow: 0 24px 60px rgba(0, 0, 0, .5);
}
dialog::backdrop { background: rgba(5, 8, 14, .6); backdrop-filter: blur(4px); }
dialog label { display: flex; flex-direction: column; gap: 6px; margin-top: 12px; }
.toast {
  position: fixed; left: 50%; bottom: 24px; transform: translate(-50%, 16px);
  max-width: 80vw; padding: 11px 18px; border-radius: 12px;
  background: var(--surface-3); color: var(--text-primary); border: 1px solid var(--border);
  box-shadow: 0 12px 32px rgba(0, 0, 0, .4);
  opacity: 0; pointer-events: none; transition: opacity .2s, transform .2s;
}
.toast.show { opacity: 1; transform: translate(-50%, 0); }
.toast.error { background: var(--critical); color: #fff; }

/* ---------- curso ---------- */
.eyebrow { margin: 0 0 6px; font-size: 12px; font-weight: 600; letter-spacing: .06em; text-transform: uppercase; color: var(--accent); }
.course-hero { display: grid; grid-template-columns: 1.6fr 1fr; gap: 32px; align-items: center; padding: 28px 30px; }
.course-hero h1 { font-size: 30px; margin-bottom: 8px; }
.hero-progress { display: flex; flex-direction: column; gap: 6px; padding-left: 28px; border-left: 1px solid var(--grid); }
.hero-progress .value { font-size: 44px; font-weight: 600; line-height: 1.1; }
@media (max-width: 900px) { .course-hero { grid-template-columns: 1fr; } .hero-progress { padding-left: 0; border-left: 0; } }
.bar { display: block; height: 6px; margin-top: 8px; overflow: hidden; border-radius: 3px; background: var(--grid); }
.bar > span { display: block; height: 100%; border-radius: 3px; background: var(--accent); transition: width .3s; }
.bar.large { height: 10px; border-radius: 5px; }
.module-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(330px, 1fr)); gap: 16px; }
.module-card {
  display: flex; gap: 16px; padding: 18px; text-align: left; font: inherit; color: inherit; cursor: pointer;
  background: var(--surface-1); border: 1px solid var(--border); border-radius: 12px; box-shadow: var(--shadow);
  transition: border-color .15s, transform .15s;
}
.module-card:hover { border-color: var(--accent); transform: translateY(-1px); }
.module-num {
  flex: none; display: grid; place-items: center; width: 42px; height: 42px; border-radius: 10px;
  font-weight: 600; font-size: 14px; color: var(--accent); background: color-mix(in srgb, var(--accent) 12%, transparent);
}
.module-body { display: flex; flex: 1; min-width: 0; flex-direction: column; gap: 4px; }
.module-body strong { font-size: 15px; }
.module-meta { margin-top: 4px; font-size: 12px; color: var(--text-muted); }

.course-layout { display: grid; grid-template-columns: 300px minmax(0, 1fr); gap: 20px; align-items: start; }
.course-sidebar { position: sticky; top: 72px; max-height: calc(100vh - 92px); overflow-y: auto; padding: 12px; }
@media (max-width: 1000px) { .course-layout { grid-template-columns: 1fr; } .course-sidebar { position: static; max-height: none; } }
.nav-module { padding: 4px 0; border-top: 1px solid var(--grid); }
.nav-module:first-of-type { margin-top: 10px; }
.nav-module-title {
  display: flex; justify-content: space-between; gap: 8px; width: 100%; padding: 8px 6px; text-align: left;
  font: inherit; font-size: 13px; font-weight: 600; color: var(--text-primary); background: none; border: 0; cursor: pointer;
}
.nav-module ol { display: none; margin: 0; padding: 0 0 6px; list-style: none; }
.nav-module.open ol { display: block; }
.nav-module li button {
  display: flex; align-items: flex-start; gap: 8px; width: 100%; padding: 6px; text-align: left; font: inherit; font-size: 13px;
  color: var(--text-secondary); background: none; border: 0; border-radius: 6px; cursor: pointer;
}
.nav-module li button:hover { color: var(--text-primary); background: var(--surface-2); }
.nav-module li button.active { color: var(--text-primary); font-weight: 500; background: color-mix(in srgb, var(--accent) 12%, transparent); }
.check { flex: none; width: 16px; height: 16px; margin-top: 2px; border: 1.5px solid var(--axis); border-radius: 50%; font-size: 10px; line-height: 13px; text-align: center; }
.check.done { color: #fff; background: var(--good); border-color: var(--good); }

.lesson-card { padding: 28px 36px 24px; }
.lesson-card h1 { margin: 0 0 4px; font-size: 28px; }
.lesson-content { max-width: 780px; margin-top: 20px; font-size: 15px; line-height: 1.7; }
.lesson-content h2 { margin: 32px 0 10px; font-size: 19px; }
.lesson-content h3 { margin: 22px 0 6px; font-size: 16px; }
.lesson-content p, .lesson-content ul, .lesson-content ol { margin: 10px 0; }
.lesson-content li { margin: 4px 0; }
.lesson-content .table { margin: 14px 0; font-size: 14px; }
.lesson-content .table td { white-space: normal; }
.lesson-content a { color: var(--accent); }
.callout { margin: 18px 0; padding: 14px 16px 14px 18px; border-left: 4px solid var(--accent); border-radius: 10px; background: color-mix(in srgb, var(--accent) 7%, transparent); }
.callout > strong:first-child { display: block; margin-bottom: 4px; font-size: 12px; letter-spacing: .05em; text-transform: uppercase; }
.callout p { margin: 4px 0; }
.callout.example { border-color: var(--series-3); background: color-mix(in srgb, var(--series-3) 8%, transparent); }
.callout.warning { border-color: var(--warning); background: color-mix(in srgb, var(--warning) 11%, transparent); }
.callout.bot { border-color: var(--series-2); background: color-mix(in srgb, var(--series-2) 8%, transparent); }
.formula { margin: 12px 0; padding: 10px 14px; overflow-x: auto; border-radius: 8px; background: var(--surface-2); font: 14px/1.6 ui-monospace, Consolas, monospace; }
.lesson-content figure { margin: 20px 0; }
.lesson-content figcaption { margin-top: 6px; font-size: 12px; color: var(--text-secondary); }
.lesson-content svg { display: block; max-width: 100%; height: auto; }
.lesson-footer { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 12px; margin-top: 36px; padding-top: 18px; border-top: 1px solid var(--grid); }
.btn.done { color: #fff; background: var(--good); border-color: var(--good); }

.quiz .question { margin: 14px 0; padding: 14px 16px; border: 1px solid var(--grid); border-radius: 10px; }
.quiz .q-text { margin: 0 0 10px; font-weight: 600; }
.quiz .option {
  display: block; width: 100%; margin: 6px 0; padding: 9px 12px; text-align: left; font: inherit; font-size: 14px;
  color: var(--text-primary); background: var(--surface-1); border: 1px solid var(--axis); border-radius: 8px; cursor: pointer;
}
.quiz .option:hover:not(:disabled) { border-color: var(--accent); }
.quiz .option:disabled { cursor: default; }
.quiz .option.correct { border-color: var(--good); background: color-mix(in srgb, var(--good) 12%, transparent); }
.quiz .option.wrong { border-color: var(--critical); background: color-mix(in srgb, var(--critical) 10%, transparent); }
.quiz .why { display: none; margin: 8px 0 0; font-size: 14px; color: var(--text-secondary); }
.quiz .answered .why { display: block; }
.quiz-result { margin-top: 16px; font-weight: 600; }
.glossary-search { width: 100%; margin: 8px 0 16px; padding: 9px 12px; font: inherit; color: var(--text-primary); background: var(--surface-1); border: 1px solid var(--axis); border-radius: 8px; }
.glossary { margin: 0; }
.glossary .letter { margin: 20px 0 4px; font-size: 13px; font-weight: 600; color: var(--accent); }
.glossary .term { padding: 10px 0; border-bottom: 1px solid var(--grid); }
.glossary dt { font-weight: 600; }
.glossary dd { margin: 2px 0 0; color: var(--text-secondary); }

/* ---------- barra superior en ventanas estrechas ---------- */
@media (max-width: 1100px) {
  .topbar { flex-wrap: wrap; gap: 10px 16px; padding: 10px 16px; }
  .tabs { order: 3; width: 100%; overflow-x: auto; }
  .tabs button { flex: none; }
}