/* ============================================================
   TOKENS
   ============================================================ */
:root {
  --glow-input:  #38BDF8;
  --glow-aux:    #34D399;
  --glow-geq:    #FBBF24;
  --glow-fx:     #C084FC;
  --glow-master: #FB7185;

  --font-display: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-body: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, "SF Mono", "Cascadia Code", "Segoe UI Mono", Menlo, Consolas, "Liberation Mono", monospace;

  --maxw: 1180px;
  --radius: 14px;
  --radius-sm: 9px;
  --rail-w: 264px;
  --header-h: 60px;
  --ease: cubic-bezier(.22,.61,.36,1);
}

[data-theme="dark"] {
  --bg: #0D1117;
  --bg-grad: radial-gradient(1200px 600px at 78% -10%, #15202c 0%, #0d1117 55%);
  --surface: #161C24;
  --surface-2: #1B232D;
  --surface-hi: #222C38;
  --border: #28323E;
  --border-hi: #38465680;
  --text: #E7ECF3;
  --text-dim: #93A0B0;
  --text-faint: #616E7E;
  --shadow: 0 10px 30px -12px #00000099;
}

[data-theme="light"] {
  --bg: #F2F5F9;
  --bg-grad: radial-gradient(1100px 560px at 80% -12%, #e3ecf7 0%, #f2f5f9 55%);
  --surface: #FFFFFF;
  --surface-2: #EEF3F8;
  --surface-hi: #E4ECF4;
  --border: #DCE3EC;
  --border-hi: #C3CFDC;
  --text: #131922;
  --text-dim: #54616F;
  --text-faint: #8593A2;
  --shadow: 0 12px 28px -16px #1f2a3a40;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .001ms !important; transition-duration: .001ms !important; }
}

body {
  font-family: var(--font-body);
  background: var(--bg);
  background-image: var(--bg-grad);
  background-attachment: fixed;
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
a { color: inherit; }

:focus-visible { outline: 2px solid var(--glow-input); outline-offset: 3px; border-radius: 4px; }

.skip-link {
  position: absolute; left: 12px; top: -60px;
  background: var(--glow-input); color: #04121d;
  padding: 10px 16px; border-radius: 8px; font-weight: 600;
  z-index: 200; transition: top .2s var(--ease);
}
.skip-link:focus { top: 12px; }

/* ============================================================ HEADER */
.app-header {
  position: sticky; top: 0; z-index: 60; height: var(--header-h);
  display: flex; align-items: center; gap: 12px; padding: 0 16px;
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: blur(14px); border-bottom: 1px solid var(--border);
}
.brand {
  display: flex; align-items: center; gap: 10px; text-decoration: none;
  margin-right: auto; font-family: var(--font-display);
  font-weight: 700; letter-spacing: .14em; font-size: 1.02rem;
}
.brand .dot {
  width: 11px; height: 11px; border-radius: 50%;
  background: var(--glow-input); box-shadow: 0 0 10px 1px var(--glow-input);
  animation: pulse 2.6s ease-in-out infinite;
}
@keyframes pulse { 0%,100%{opacity:1} 50%{opacity:.35} }
.brand small {
  font-family: var(--font-mono); font-weight: 500; font-size: .58rem;
  letter-spacing: .18em; color: var(--text-faint); align-self: center;
  padding: 2px 6px; border: 1px solid var(--border); border-radius: 5px;
}
.icon-btn {
  display: grid; place-items: center; width: 40px; height: 40px; flex: 0 0 auto;
  background: var(--surface); border: 1px solid var(--border); border-radius: 10px;
  color: var(--text); cursor: pointer; transition: border-color .18s, background .18s, transform .12s;
}
.icon-btn:hover { border-color: var(--border-hi); background: var(--surface-hi); }
.icon-btn:active { transform: scale(.94); }
.icon-btn svg { width: 19px; height: 19px; }
.theme-btn .sun { display: none; }
[data-theme="light"] .theme-btn .sun { display: block; }
[data-theme="light"] .theme-btn .moon { display: none; }
#navToggle { display: inline-grid; }

/* ============================================================ LAYOUT */
.shell { display: flex; max-width: var(--maxw); margin: 0 auto; }

.rail {
  position: fixed; inset: var(--header-h) 0 0 0; z-index: 55;
  background: var(--surface); border-right: 1px solid var(--border);
  padding: 18px 14px 28px; overflow-y: auto;
  transform: translateX(-100%); transition: transform .32s var(--ease);
  width: min(86vw, var(--rail-w));
}
.rail.open { transform: translateX(0); }
.rail::-webkit-scrollbar { width: 8px; }
.rail::-webkit-scrollbar-thumb { background: var(--border); border-radius: 8px; }
.rail-label {
  font-family: var(--font-mono); font-size: .62rem; letter-spacing: .22em;
  color: var(--text-faint); text-transform: uppercase; padding: 4px 10px 12px;
}
.nav-list { list-style: none; display: flex; flex-direction: column; gap: 4px; }
.nav-link {
  --c: var(--glow-input);
  display: grid; grid-template-columns: 4px 1fr auto; align-items: center;
  gap: 12px; padding: 11px 12px 11px 8px; text-decoration: none;
  border-radius: 10px; color: var(--text-dim); transition: background .16s, color .16s;
}
.nav-link .bar { width: 4px; height: 26px; border-radius: 4px; background: var(--c); opacity: .42; transition: opacity .18s, box-shadow .18s; }
.nav-link .nav-name { font-weight: 600; font-size: .95rem; }
.nav-link .nav-idx { font-family: var(--font-mono); font-size: .68rem; color: var(--text-faint); letter-spacing: .05em; }
.nav-link:hover { background: var(--surface-2); color: var(--text); }
.nav-link:hover .bar { opacity: .8; }
.nav-link.active { background: var(--surface-2); color: var(--text); }
.nav-link.active .bar { opacity: 1; box-shadow: 0 0 12px 0 var(--c); }
.nav-link.active .nav-name { color: var(--c); }
.rail-foot {
  margin-top: 22px; padding: 12px 10px 0; border-top: 1px solid var(--border);
  font-family: var(--font-mono); font-size: .64rem; color: var(--text-faint); line-height: 1.7;
}
.backdrop {
  position: fixed; inset: var(--header-h) 0 0 0; z-index: 54;
  background: #00000066; opacity: 0; pointer-events: none; transition: opacity .3s var(--ease);
}
.backdrop.show { opacity: 1; pointer-events: auto; }

.content { flex: 1; min-width: 0; padding: 24px 18px 80px; width: 100%; }

/* ============================================================ VISTAS */
.view { animation: fade .35s var(--ease); }
@keyframes fade { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: none; } }

.eyebrow {
  display: inline-flex; align-items: center; gap: 8px; font-family: var(--font-mono);
  font-size: .68rem; letter-spacing: .2em; text-transform: uppercase;
  color: var(--sec-c, var(--glow-input)); margin-bottom: 14px;
}
.eyebrow::before {
  content: ""; width: 22px; height: 3px; border-radius: 3px;
  background: var(--sec-c, var(--glow-input)); box-shadow: 0 0 8px 0 var(--sec-c, var(--glow-input));
}
h1.title {
  font-family: var(--font-display); font-weight: 700;
  font-size: clamp(1.9rem, 7vw, 3rem); line-height: 1.05; letter-spacing: -.02em; margin-bottom: 14px;
}
.lead { font-size: clamp(1rem, 3.6vw, 1.15rem); color: var(--text-dim); max-width: 62ch; }

/* cuerpo markdown */
.md-body h2 {
  font-family: var(--font-display); font-weight: 600;
  font-size: clamp(1.35rem, 5vw, 1.7rem); letter-spacing: -.01em; margin: 36px 0 14px;
}
.md-body h3 { font-family: var(--font-display); font-weight: 600; font-size: 1.12rem; margin: 26px 0 10px; }
.md-body h4 { font-family: var(--font-display); font-weight: 600; font-size: 1rem; margin: 20px 0 8px; color: var(--text-dim); }
.md-body p { margin: 0 0 14px; max-width: 70ch; color: var(--text); }
.md-body h1 { font-family: var(--font-display); font-size: clamp(1.7rem,6vw,2.4rem); letter-spacing:-.02em; margin: 6px 0 14px; }
.md-body > p:first-of-type { color: var(--text-dim); font-size: 1.05rem; }
.md-body img { max-width: 100%; height: auto; border-radius: var(--radius); border: 1px solid var(--border); margin: 8px 0; }
.md-body pre {
  background: var(--surface-2); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 14px 16px; overflow-x: auto; margin: 14px 0;
}
.md-body pre code { font-family: var(--font-mono); font-size: .85rem; color: var(--text); }
.md-body :not(pre) > code {
  font-family: var(--font-mono); font-size: .85em;
  background: var(--surface-hi); padding: 1px 6px; border-radius: 5px;
}
.md-body hr { border: none; border-top: 1px solid var(--border); margin: 26px 0; }

ul.bullets, ol.steps { margin: 0 0 16px 0; padding-left: 0; list-style: none; max-width: 70ch; }
ul.bullets li { position: relative; padding: 4px 0 4px 26px; color: var(--text); }
ul.bullets li::before {
  content: ""; position: absolute; left: 4px; top: 13px; width: 7px; height: 7px;
  border-radius: 2px; background: var(--sec-c, var(--glow-input));
}

.term, .ext {
  color: var(--sec-c, var(--glow-input)); text-decoration: none; cursor: pointer;
  border-bottom: 1px solid color-mix(in srgb, var(--sec-c, var(--glow-input)) 45%, transparent);
  transition: border-color .15s, background .15s; padding-bottom: 1px;
}
.term:hover, .ext:hover {
  border-bottom-color: var(--sec-c, var(--glow-input));
  background: color-mix(in srgb, var(--sec-c, var(--glow-input)) 12%, transparent);
}
.ext::after { content: "↗"; font-family: var(--font-mono); font-size: .72em; margin-left: 3px; opacity: .7; }

/* migas + volver */
.crumb { font-family: var(--font-mono); font-size: .72rem; color: var(--text-faint); margin-bottom: 16px; display: flex; gap: 8px; align-items: center; }
.crumb a { color: var(--sec-c); text-decoration: none; }
.crumb a:hover { text-decoration: underline; }
.back-link {
  display: inline-block; margin-top: 30px; font-family: var(--font-mono); font-size: .82rem;
  color: var(--sec-c); text-decoration: none; padding: 8px 14px;
  border: 1px solid color-mix(in srgb, var(--sec-c) 40%, var(--border)); border-radius: 8px;
  transition: background .15s;
}
.back-link:hover { background: color-mix(in srgb, var(--sec-c) 10%, transparent); }
.loading { color: var(--text-faint); font-family: var(--font-mono); }

/* ============================================================ ÍNDICE DE TEMAS */
.topic-list { display: flex; flex-direction: column; gap: 10px; margin-top: 24px; }
.topic-card {
  display: grid; grid-template-columns: auto 1fr; align-items: center; gap: 16px;
  padding: 16px 18px; border-radius: var(--radius); text-decoration: none;
  background: var(--surface); border: 1px solid var(--border);
  transition: border-color .18s, transform .18s, box-shadow .18s;
}
.topic-card:hover { border-color: color-mix(in srgb, var(--sec-c) 55%, var(--border)); transform: translateY(-2px); box-shadow: var(--shadow); }
.topic-card .t-idx { font-family: var(--font-mono); font-size: 1.1rem; font-weight: 600; color: var(--sec-c); }
.topic-card .t-main { display: flex; flex-direction: column; gap: 3px; min-width: 0; }
.topic-card .t-title { font-family: var(--font-display); font-weight: 600; font-size: 1.05rem; color: var(--text); }
.topic-card .t-tag { font-family: var(--font-mono); font-size: .64rem; letter-spacing: .1em; text-transform: uppercase; color: var(--sec-c); }
.topic-card.disabled { opacity: .55; cursor: not-allowed; }
.topic-card.disabled:hover { transform: none; box-shadow: none; border-color: var(--border); }
.topic-card.disabled .t-idx, .topic-card.disabled .t-tag { color: var(--text-faint); }

/* ============================================================ COMPONENTES (reutilizables desde md) */
.card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 18px; box-shadow: var(--shadow); margin: 16px 0; }

.table-wrap { overflow-x: auto; margin: 14px 0; border-radius: var(--radius); border: 1px solid var(--border); }
table { width: 100%; border-collapse: collapse; min-width: 460px; }
thead th {
  text-align: left; font-family: var(--font-mono); font-weight: 600; font-size: .68rem;
  letter-spacing: .12em; text-transform: uppercase; color: var(--text-faint);
  padding: 12px 14px; background: var(--surface-2); border-bottom: 1px solid var(--border);
}
tbody td { padding: 12px 14px; border-bottom: 1px solid var(--border); vertical-align: top; color: var(--text); }
tbody tr:last-child td { border-bottom: none; }
tbody tr { background: var(--surface); transition: background .15s; }
tbody tr.flash { background: color-mix(in srgb, var(--sec-c) 16%, var(--surface)); }
td strong { color: var(--text); }

.meter { display: flex; gap: 3px; height: 22px; margin: 8px 0 4px; }
.meter i { flex: 1; border-radius: 2px; background: var(--surface-hi); }
.meter i.g { background: #2FBF71; }
.meter i.y { background: #E0B341; }
.meter i.r { background: #E5484D; }

.note {
  display: flex; gap: 12px; padding: 14px 16px; margin: 16px 0; border-radius: var(--radius);
  border: 1px solid var(--border); background: var(--surface-2);
}
.note .ico { flex: 0 0 auto; font-size: 1.05rem; }
.note.warn { border-color: color-mix(in srgb, var(--glow-master) 40%, var(--border)); }
.note.warn .ico { color: var(--glow-master); }
.note.tip { border-color: color-mix(in srgb, var(--glow-aux) 40%, var(--border)); }
.note.tip .ico { color: var(--glow-aux); }
.note p { margin: 0 !important; font-size: .95rem; }
.note b, .note strong { font-family: var(--font-display); }

ol.steps { counter-reset: step; }
ol.steps > li { position: relative; padding: 4px 0 16px 44px; counter-increment: step; color: var(--text); }
ol.steps > li::before {
  content: counter(step, decimal-leading-zero); position: absolute; left: 0; top: 2px;
  font-family: var(--font-mono); font-size: .8rem; font-weight: 600; color: var(--sec-c);
  width: 30px; height: 30px; border-radius: 8px; display: grid; place-items: center;
  border: 1px solid color-mix(in srgb, var(--sec-c) 40%, var(--border)); background: var(--surface);
}

.res-grid { display: grid; gap: 14px; margin: 16px 0; grid-template-columns: 1fr; }

/* ============================================================ HERO · consola */
.hero { padding-top: 6px; }
.console {
  display: grid; grid-template-columns: repeat(5, 1fr); gap: 10px; margin: 26px 0 8px;
  padding: 20px 14px 16px; background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); box-shadow: var(--shadow);
}
.fader {
  --c: var(--glow-input); display: flex; flex-direction: column; align-items: center; gap: 10px;
  text-decoration: none; color: var(--text-dim); padding: 6px 2px 8px; border-radius: var(--radius-sm);
  transition: background .18s;
}
.fader:hover, .fader:focus-visible { background: var(--surface-2); color: var(--text); }
.fader .track { position: relative; width: 8px; height: 120px; border-radius: 6px; background: var(--surface-hi); overflow: hidden; }
.fader .glow {
  position: absolute; left: 0; right: 0; bottom: 0; height: 60%; border-radius: 6px;
  background: linear-gradient(to top, var(--c), color-mix(in srgb, var(--c) 30%, transparent));
  box-shadow: 0 0 14px 0 var(--c);
}
.fader .knob {
  position: absolute; left: 50%; transform: translateX(-50%); bottom: 56%;
  width: 26px; height: 13px; border-radius: 4px; background: var(--surface);
  border: 1px solid var(--border-hi); box-shadow: 0 2px 6px #0006; transition: bottom .4s var(--ease);
}
.fader:hover .knob, .fader:focus-visible .knob { bottom: 70%; }
.fader:hover .glow, .fader:focus-visible .glow { height: 74%; transition: height .4s var(--ease); }
.fader .fname { font-family: var(--font-display); font-weight: 600; font-size: .82rem; text-align: center; line-height: 1.15; color: var(--text); }
.fader .fglow { font-family: var(--font-mono); font-size: .58rem; letter-spacing: .1em; text-transform: uppercase; color: var(--c); }
.hero-meta { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 14px; font-family: var(--font-mono); font-size: .72rem; color: var(--text-dim); }
.hero-meta span { padding: 5px 10px; border: 1px solid var(--border); border-radius: 20px; background: var(--surface); }

/* ============================================================ RESPONSIVE */
@media (min-width: 880px) {
  #navToggle { display: none; }
  .rail {
    position: sticky; inset: auto; top: var(--header-h); height: calc(100vh - var(--header-h));
    transform: none; flex: 0 0 var(--rail-w); width: var(--rail-w);
  }
  .backdrop { display: none; }
  .content { padding: 40px 44px 100px; }
  .res-grid { grid-template-columns: 1fr 1fr; }
}
@media (min-width: 1024px) {
  .console { gap: 16px; padding: 26px 22px 20px; }
  .fader .track { height: 150px; }
}