/* Estudio AWS CLF-C02 — estilos (mobile-first, claro/oscuro, impresión) */

:root {
  --bg: #f5f6fa; --card: #ffffff; --card2: #eef0f6; --tx: #1b1f2a; --mut: #5d6678; --bd: #dde1ea;
  --acc: #4338ca; --acc-tx: #ffffff; --ok: #12783a; --bad: #b42318; --warn: #8a5a00;
  --ok-bg: #e3f6ea; --bad-bg: #fde8e6; --warn-bg: #fff4d6; --sombra: 0 1px 3px rgba(20,25,40,.08);
  /* Colores por categoría (iguales en tarjetas, diagramas, palacio y notas) */
  --c-seguridad: #d92d20; --c-bd: #2563eb; --c-computo: #e46b07; --c-almacenamiento: #15803d;
  --c-redes: #7c3aed; --c-costos: #b88600; --c-gestion: #64748b; --c-migracion: #0d9488;
  --c-ia: #db2777; --c-devops: #8b4513; --c-conceptos: #4338ca;
  --radio: 12px; --nav-alto: 64px;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #10131a; --card: #1a1e28; --card2: #232838; --tx: #e8ebf2; --mut: #9aa3b5; --bd: #2c3242;
    --acc: #8b93ff; --acc-tx: #10131a; --ok: #4ade80; --bad: #f87171; --warn: #fbbf24;
    --ok-bg: #12301f; --bad-bg: #3a1714; --warn-bg: #3a2c08; --sombra: none;
    --c-seguridad: #f2665c; --c-bd: #5b8def; --c-computo: #f59143; --c-almacenamiento: #3fbf6a;
    --c-redes: #a57bf5; --c-costos: #e3b82d; --c-gestion: #94a3b8; --c-migracion: #2dc4b4;
    --c-ia: #f06aa8; --c-devops: #c98a5a; --c-conceptos: #8b93ff;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #10131a; --card: #1a1e28; --card2: #232838; --tx: #e8ebf2; --mut: #9aa3b5; --bd: #2c3242;
  --acc: #8b93ff; --acc-tx: #10131a; --ok: #4ade80; --bad: #f87171; --warn: #fbbf24;
  --ok-bg: #12301f; --bad-bg: #3a1714; --warn-bg: #3a2c08; --sombra: none;
  --c-seguridad: #f2665c; --c-bd: #5b8def; --c-computo: #f59143; --c-almacenamiento: #3fbf6a;
  --c-redes: #a57bf5; --c-costos: #e3b82d; --c-gestion: #94a3b8; --c-migracion: #2dc4b4;
  --c-ia: #f06aa8; --c-devops: #c98a5a; --c-conceptos: #8b93ff;
  color-scheme: dark;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--tx); font: 16px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; overflow-x: hidden; }
a { color: var(--acc); }
h1 { font-size: 1.45rem; margin: .2em 0 .6em; line-height: 1.25; }
h2 { font-size: 1.15rem; margin: 1.2em 0 .5em; }
h3 { font-size: 1rem; margin: 1em 0 .4em; }
p { margin: .4em 0; }
small, .mut { color: var(--mut); }
code { background: var(--card2); padding: 0 .3em; border-radius: 4px; }
:focus-visible { outline: 3px solid var(--acc); outline-offset: 2px; border-radius: 6px; }
.saltar { position: absolute; left: -999px; top: 0; background: var(--acc); color: var(--acc-tx); padding: 8px 12px; z-index: 100; }
.saltar:focus { left: 8px; top: 8px; }
[hidden] { display: none !important; }

/* ── Layout: navegación inferior en móvil, lateral en PC ── */
.layout { min-height: 100vh; }
main { padding: 16px 16px calc(var(--nav-alto) + 24px + env(safe-area-inset-bottom)); max-width: 1100px; margin: 0 auto; outline: none; }
.nav { position: fixed; z-index: 30; left: 0; right: 0; bottom: 0; height: calc(var(--nav-alto) + env(safe-area-inset-bottom));
  padding-bottom: env(safe-area-inset-bottom); background: var(--card); border-top: 1px solid var(--bd); display: flex; }
.nav a, .nav button { flex: 1; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 2px;
  color: var(--mut); text-decoration: none; font: inherit; font-size: .72rem; background: none; border: 0; cursor: pointer; min-width: 0; }
.nav .ico { font-size: 1.35rem; line-height: 1; }
.nav [aria-current="page"] { color: var(--acc); font-weight: 700; }
.nav .solo-pc { display: none; }
.nav-mas { position: fixed; z-index: 29; left: 8px; right: 8px; bottom: calc(var(--nav-alto) + 8px + env(safe-area-inset-bottom));
  background: var(--card); border: 1px solid var(--bd); border-radius: var(--radio); padding: 8px; display: grid; grid-template-columns: repeat(3, 1fr); gap: 6px; box-shadow: 0 8px 30px rgba(0,0,0,.25); }
.nav-mas a { display: flex; flex-direction: column; align-items: center; padding: 10px 4px; border-radius: 10px; text-decoration: none; color: var(--tx); font-size: .8rem; text-align: center; }
.nav-mas a:hover, .nav-mas a[aria-current="page"] { background: var(--card2); }
.nav-mas .ico { font-size: 1.4rem; }

@media (min-width: 900px) {
  .layout { display: grid; grid-template-columns: 220px 1fr; }
  .nav { position: sticky; top: 0; height: 100vh; flex-direction: column; border-top: 0; border-right: 1px solid var(--bd); padding: 12px 8px; overflow-y: auto; }
  .nav a, .nav button { flex: 0 0 auto; flex-direction: row; justify-content: flex-start; gap: 10px; padding: 9px 12px; border-radius: 9px; font-size: .95rem; color: var(--tx); }
  .nav a:hover { background: var(--card2); }
  .nav [aria-current="page"] { background: var(--card2); color: var(--acc); }
  .nav .solo-pc { display: flex; }
  .nav .solo-movil { display: none; }
  .nav .marca { font-weight: 800; color: var(--acc); padding: 6px 12px 14px; font-size: 1.05rem; }
  .nav-mas { display: none !important; }
  main { padding: 24px 32px 48px; }
}

/* ── Componentes ── */
.card { background: var(--card); border: 1px solid var(--bd); border-radius: var(--radio); padding: 16px; margin-bottom: 14px; box-shadow: var(--sombra); }
.grid { display: grid; gap: 12px; grid-template-columns: repeat(auto-fill, minmax(min(100%, 240px), 1fr)); }
.grid-2 { display: grid; gap: 12px; grid-template-columns: repeat(auto-fit, minmax(min(100%, 300px), 1fr)); }
.grid-kpi { display: grid; gap: 8px; grid-template-columns: repeat(3, minmax(0, 1fr)); margin-bottom: 14px; }
.grid-kpi .card { margin: 0; padding: 12px 10px; }
@media (max-width: 480px) { .grid-kpi .kpi { font-size: 1.35rem; } .grid-kpi .kpi-lbl { font-size: .74rem; } }
.fila { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.entre { justify-content: space-between; }
.pila > * + * { margin-top: 10px; }
.btn { font: inherit; font-weight: 600; min-height: 44px; padding: 8px 16px; border-radius: 10px; border: 1px solid var(--bd); background: var(--card); color: var(--tx); cursor: pointer; display: inline-flex; align-items: center; justify-content: center; gap: 6px; text-decoration: none; }
.btn:hover { background: var(--card2); }
.btn.prim { background: var(--acc); border-color: var(--acc); color: var(--acc-tx); }
.btn.prim:hover { filter: brightness(1.08); }
.btn.grande { min-height: 56px; font-size: 1.1rem; padding: 10px 22px; width: 100%; }
.btn.peligro { color: var(--bad); border-color: var(--bad); }
.btn.chico { min-height: 36px; padding: 4px 10px; font-size: .88rem; }
.btn:disabled { opacity: .5; cursor: not-allowed; }
.btn-icono { background: none; border: 0; color: var(--tx); font-size: 1.2rem; min-width: 44px; min-height: 44px; cursor: pointer; border-radius: 10px; }
.chip { display: inline-flex; align-items: center; gap: 4px; padding: 2px 10px; border-radius: 999px; font-size: .8rem; font-weight: 600; border: 1px solid var(--bd); background: var(--card2); white-space: nowrap; }
.chip.ok { color: var(--ok); background: var(--ok-bg); border-color: transparent; }
.chip.bad { color: var(--bad); background: var(--bad-bg); border-color: transparent; }
.chip.warn { color: var(--warn); background: var(--warn-bg); border-color: transparent; }
.chip.cat { color: #fff; border-color: transparent; background: var(--cat); }
.barra { height: 10px; background: var(--card2); border-radius: 99px; overflow: hidden; }
.barra > i { display: block; height: 100%; background: var(--cat, var(--acc)); border-radius: 99px; }
.kpi { font-size: 1.8rem; font-weight: 800; line-height: 1.1; }
.kpi-lbl { font-size: .82rem; color: var(--mut); }
.aviso { position: fixed; z-index: 60; left: 50%; transform: translateX(-50%); bottom: calc(var(--nav-alto) + 16px); background: var(--tx); color: var(--bg); padding: 10px 16px; border-radius: 10px; max-width: calc(100% - 32px); font-weight: 600; }
.vacio { text-align: center; padding: 32px 16px; color: var(--mut); }
select, input[type=text], input[type=number], input[type=date], textarea { font: inherit; color: var(--tx); background: var(--card); border: 1px solid var(--bd); border-radius: 9px; padding: 8px 10px; min-height: 44px; max-width: 100%; }
textarea { width: 100%; min-height: 110px; resize: vertical; }
label.linea { display: flex; gap: 10px; align-items: center; justify-content: space-between; padding: 8px 0; border-bottom: 1px solid var(--bd); }
.tabla-wrap { overflow-x: auto; }
table { border-collapse: collapse; width: 100%; font-size: .92rem; }
th, td { text-align: left; padding: 8px; border-bottom: 1px solid var(--bd); vertical-align: top; }
th { color: var(--mut); font-weight: 600; }

/* Interruptor Ruta guiada / Aleatorio */
.modo { display: inline-flex; border: 1px solid var(--bd); border-radius: 999px; padding: 3px; background: var(--card2); }
.modo button { font: inherit; font-size: .88rem; border: 0; background: none; color: var(--mut); padding: 6px 12px; border-radius: 999px; cursor: pointer; min-height: 36px; font-weight: 600; }
.modo button[aria-pressed="true"] { background: var(--acc); color: var(--acc-tx); }
.switch { position: relative; width: 50px; height: 28px; flex: none; }
.switch input { opacity: 0; width: 100%; height: 100%; position: absolute; margin: 0; cursor: pointer; z-index: 1; }
.switch span { position: absolute; inset: 0; background: var(--bd); border-radius: 99px; transition: .15s; }
.switch span::after { content: ""; position: absolute; width: 22px; height: 22px; left: 3px; top: 3px; background: #fff; border-radius: 50%; transition: .15s; }
.switch input:checked + span { background: var(--ok); }
.switch input:checked + span::after { left: 25px; }
.switch input:focus-visible + span { outline: 3px solid var(--acc); outline-offset: 2px; }

/* ── Flashcards ── */
.tarjeta { position: relative; background: var(--card); border: 1px solid var(--bd); border-top: 6px solid var(--cat, var(--acc)); border-radius: 16px; padding: 22px 18px; min-height: 260px; box-shadow: var(--sombra); touch-action: pan-y; user-select: none; transition: transform .15s; }
.tarjeta .frente { font-size: 1.5rem; font-weight: 800; text-align: center; margin: 18px 0; }
.tarjeta .tipo { font-size: .78rem; color: var(--mut); text-transform: uppercase; letter-spacing: .05em; }
.tarjeta .palabras { display: flex; flex-wrap: wrap; gap: 6px; justify-content: center; margin: 8px 0 14px; }
.tarjeta .palabras span { background: var(--cat); color: #fff; padding: 4px 12px; border-radius: 99px; font-weight: 700; }
.reverso dt { font-weight: 700; color: var(--cat, var(--acc)); margin-top: 10px; font-size: .9rem; }
.reverso dd { margin: 2px 0 0; }
.calif { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; margin-top: 14px; }
.calif .btn { flex-direction: column; gap: 0; padding: 6px 4px; font-size: .9rem; }
.calif .btn small { font-weight: 400; font-size: .75rem; }
.calif .c1 { border-color: var(--bad); color: var(--bad); }
.calif .c2 { border-color: var(--warn); color: var(--warn); }
.calif .c3 { border-color: var(--ok); color: var(--ok); }
.calif .c4 { border-color: var(--acc); color: var(--acc); }
.desliza-pista { text-align: center; font-size: .8rem; color: var(--mut); margin-top: 8px; }

/* ── Preguntas ── */
.pregunta .enunciado { font-size: 1.05rem; margin-bottom: 12px; }
.opciones { display: grid; gap: 8px; }
.opcion { display: flex; gap: 10px; align-items: flex-start; text-align: left; width: 100%; font: inherit; color: var(--tx); background: var(--card); border: 2px solid var(--bd); border-radius: 10px; padding: 10px 12px; cursor: pointer; min-height: 48px; }
.opcion:hover { border-color: var(--acc); }
.opcion .letra { font-weight: 800; color: var(--mut); flex: none; width: 1.4em; }
.opcion[aria-pressed="true"] { border-color: var(--acc); background: var(--card2); }
.opcion.correcta { border-color: var(--ok); background: var(--ok-bg); }
.opcion.incorrecta { border-color: var(--bad); background: var(--bad-bg); }
.opcion:disabled { cursor: default; }
.explica { font-size: .9rem; margin: 4px 0 0 2em; color: var(--mut); }
.opcion.correcta + .explica { color: var(--ok); }
mark.activ { background: #fde68a; color: #1b1f2a; border-radius: 3px; padding: 0 2px; }
.trampa { border-left: 4px solid var(--warn); background: var(--warn-bg); padding: 8px 12px; border-radius: 6px; margin-top: 10px; }

/* Simulacro */
.sim-barra { position: sticky; top: 0; z-index: 5; background: var(--bg); padding: 8px 0; }
.reloj { font-variant-numeric: tabular-nums; font-weight: 800; font-size: 1.1rem; }
.reloj.poco { color: var(--bad); }
.navq { display: grid; grid-template-columns: repeat(auto-fill, minmax(40px, 1fr)); gap: 6px; }
.navq button { font: inherit; min-height: 40px; border-radius: 8px; border: 1px solid var(--bd); background: var(--card); color: var(--tx); cursor: pointer; font-size: .85rem; }
.navq .resp { background: var(--card2); font-weight: 700; }
.navq .marc { border: 2px solid var(--warn); }
.navq .actual { outline: 3px solid var(--acc); }

/* Tooltips (diagramas y palacio) */
.tip { position: fixed; z-index: 70; max-width: min(320px, calc(100vw - 24px)); background: var(--tx); color: var(--bg); padding: 10px 12px; border-radius: 10px; font-size: .88rem; pointer-events: none; box-shadow: 0 6px 20px rgba(0,0,0,.3); }
.tip b { display: block; margin-bottom: 2px; }
.tip .k { display: inline-block; margin-top: 4px; font-weight: 700; color: #fbbf24; }

/* SVG */
.svg-wrap { width: 100%; overflow: hidden; background: var(--card); border: 1px solid var(--bd); border-radius: var(--radio); }
.svg-wrap svg { display: block; width: 100%; height: auto; max-width: 620px; margin: 0 auto; }
svg text { font-family: system-ui, sans-serif; }
.nodo { cursor: pointer; }
.nodo rect, .nodo circle { stroke-width: 2; }
.nodo:hover rect, .nodo:focus rect, .nodo:hover circle, .nodo:focus circle { stroke-width: 4; }
.nodo:focus { outline: none; }
.nodo.activo rect, .nodo.activo circle { stroke-width: 5; }
.svg-fondo { fill: var(--card); }
.svg-tx { fill: var(--tx); }
.svg-mut { fill: var(--mut); }
.svg-linea { stroke: var(--mut); }
.habit { cursor: pointer; }
.habit:hover > rect.piso, .habit.foco > rect.piso { stroke-width: 4; }
.habit.ok > rect.piso { fill: var(--ok) !important; fill-opacity: .35; }
.habit.mal > rect.piso { fill: var(--bad) !important; fill-opacity: .35; }
.recorrido .obj-label { display: none; }

/* Comparaciones */
.cols { display: grid; gap: 10px; grid-template-columns: repeat(auto-fit, minmax(min(100%, 200px), 1fr)); }
.col { border: 1px solid var(--bd); border-top: 5px solid var(--cat); border-radius: 10px; padding: 12px; background: var(--card); }
.col h3 { margin-top: 0; color: var(--cat); }
.clave { font-weight: 700; background: var(--warn-bg); color: var(--warn); padding: 8px 12px; border-radius: 8px; }

/* Activadores */
.palabra { display: inline; cursor: pointer; border-radius: 4px; padding: 1px 1px; }
.palabra:hover { background: var(--card2); }
.palabra.sel { background: #fde68a; color: #1b1f2a; }
.palabra.encontrada { background: var(--ok-bg); color: var(--ok); font-weight: 700; }
.palabra.faltante { background: var(--warn-bg); color: var(--warn); text-decoration: underline; font-weight: 700; }
.palabra.ruido { background: var(--bad-bg); color: var(--bad); text-decoration: line-through; }
.cuenta { height: 6px; background: var(--card2); border-radius: 99px; overflow: hidden; margin: 8px 0; }
.cuenta i { display: block; height: 100%; background: var(--acc); transition: width .1s linear; }

/* Feynman */
.check { display: flex; flex-wrap: wrap; gap: 6px; }
.check span { padding: 3px 10px; border-radius: 99px; background: var(--card2); color: var(--mut); font-size: .88rem; }
.check span.si { background: var(--ok-bg); color: var(--ok); font-weight: 700; }

/* Apuntes: mazo de estudio */
.apunte-tj { user-select: text; touch-action: pan-y; }
.apunte-tj .reverso dd { margin-bottom: 4px; }
.apunte-tj .reverso dd .chip { margin: 2px 2px 2px 0; white-space: normal; text-align: left; max-width: 100%; }
.pregunta-rec { margin-top: 14px; padding: 12px; border-radius: 10px; background: var(--card2); border-left: 4px solid var(--acc); }
.pregunta-rec p { margin: 6px 0; }
.resp-rec { color: var(--ok); font-weight: 600; }
/* Botones del mazo siempre visibles: pegados abajo, encima de la barra de navegación */
.ap-nav { display: grid; grid-template-columns: auto 1fr auto; gap: 8px; margin-top: 14px; position: sticky; z-index: 6;
  bottom: calc(var(--nav-alto) + env(safe-area-inset-bottom)); background: var(--bg); padding: 8px 0; }
@media (min-width: 900px) { .ap-nav { bottom: 0; } }
@media (max-width: 420px) { .solo-ancho { display: none; } }

/* Apuntes */
.apunte { border-left: 6px solid var(--cat); padding: 8px 12px; margin: 10px 0; background: var(--card); border-radius: 0 10px 10px 0; }
.apunte p { cursor: pointer; border-radius: 4px; }
.apunte p.sub { background: #fde68a; color: #1b1f2a; }
.margen, .solo-print { display: none; }

/* Modal */
.modal { position: fixed; inset: 0; z-index: 50; display: flex; align-items: flex-end; justify-content: center; }
.modal-fondo { position: absolute; inset: 0; background: rgba(0,0,0,.5); }
.modal-caja { position: relative; background: var(--bg); width: 100%; max-width: 640px; max-height: 88vh; overflow-y: auto; border-radius: 16px 16px 0 0; padding: 20px 16px 28px; }
.modal-x { position: absolute; right: 6px; top: 6px; z-index: 2; }
.modal-caja .tarjeta { margin-top: 28px; }
@media (min-width: 700px) { .modal { align-items: center; } .modal-caja { border-radius: 16px; } }

/* Impresión: blanco y negro legible, saltos por categoría, margen para anotar */
@media print {
  :root, :root[data-theme="dark"] { --bg: #fff; --card: #fff; --card2: #f2f2f2; --tx: #000; --mut: #333; --bd: #999; color-scheme: light; }
  body { font-size: 11pt; background: #fff; color: #000; }
  .nav, .nav-mas, .no-print, .aviso, .tip, .modal, .saltar { display: none !important; }
  .layout { display: block; }
  main { padding: 0; max-width: none; }
  .card { box-shadow: none; border: 1px solid #999; break-inside: avoid; }
  .cat-bloque { break-before: page; }
  .cat-bloque:first-of-type { break-before: auto; }
  .apunte { border-left: 6px solid #000; display: grid; grid-template-columns: 1fr 38%; gap: 10px; break-inside: avoid; }
  .apunte p.sub { background: none; text-decoration: underline; font-weight: 700; }
  .solo-print { display: block; }
  .margen { display: block; border-left: 1px dashed #666; background: repeating-linear-gradient(transparent 0 22px, #bbb 22px 23px); min-height: 100px; }
  .chip.cat { color: #000; background: #fff; border: 1px solid #000; }
  a { color: #000; text-decoration: none; }
}