/* ==========================================================================
   Atlas AMIB Figura III — Hoja de estilos
   Autor: Jeshua Romero Guadarrama
   ========================================================================== */

:root {
  --fondo: #f4f7fa;
  --panel: #ffffff;
  --tinta: #16232e;
  --tinta-suave: #55677a;
  --borde: #dde5ec;
  --acento: #0e7490;
  --acento-suave: #e0f2f7;
  --exito: #15803d;
  --error: #b91c1c;
  --sombra: 0 1px 3px rgba(22, 35, 46, .08), 0 8px 24px rgba(22, 35, 46, .06);
  --radio: 14px;
}

html[data-tema="oscuro"] {
  --fondo: #0d1620;
  --panel: #16222e;
  --tinta: #e8eef4;
  --tinta-suave: #93a5b7;
  --borde: #24384a;
  --acento: #22b8dc;
  --acento-suave: #10333f;
  --exito: #4ade80;
  --error: #f87171;
  --sombra: 0 1px 3px rgba(0, 0, 0, .4), 0 8px 24px rgba(0, 0, 0, .3);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background: var(--fondo);
  color: var(--tinta);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--acento); }

/* ----------------------- Cabecera ----------------------- */

.cabecera {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--panel) 88%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--borde);
}

.cabecera-contenido {
  max-width: 1180px;
  margin: 0 auto;
  padding: 10px 20px;
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

.marca {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 800;
  font-size: 1.05rem;
  color: var(--tinta);
  text-decoration: none;
}

.marca-icono { font-size: 1.4rem; }

.nav-principal {
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
  margin-left: auto;
}

.nav-principal a {
  padding: 7px 13px;
  border-radius: 999px;
  color: var(--tinta-suave);
  text-decoration: none;
  font-weight: 600;
  font-size: .92rem;
  transition: background .15s, color .15s;
}

.nav-principal a:hover { background: var(--acento-suave); color: var(--acento); }
.nav-principal a.activo { background: var(--acento); color: #fff; }

.boton-tema {
  border: 1px solid var(--borde);
  background: var(--panel);
  border-radius: 999px;
  width: 38px;
  height: 38px;
  font-size: 1.05rem;
  cursor: pointer;
}

/* ----------------------- Estructura ----------------------- */

main {
  max-width: 1180px;
  margin: 0 auto;
  padding: 28px 20px 60px;
}

.seccion-titulo {
  font-size: 1.35rem;
  margin: 42px 0 16px;
}

/* ----------------------- Portada ----------------------- */

.heroe {
  padding: 40px 0 8px;
  max-width: 820px;
}

.heroe h1 {
  font-size: clamp(1.9rem, 4.5vw, 3rem);
  line-height: 1.15;
  margin: 0 0 14px;
  background: linear-gradient(90deg, var(--acento), #4338ca);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.subtitulo {
  color: var(--tinta-suave);
  font-size: 1.05rem;
  margin: 0 0 22px;
}

.heroe-acciones { display: flex; gap: 10px; flex-wrap: wrap; }

.boton {
  display: inline-block;
  padding: 11px 20px;
  border-radius: 10px;
  text-decoration: none;
  font-weight: 700;
  font-size: .95rem;
  border: 1px solid transparent;
  cursor: pointer;
}

.boton-primario { background: var(--acento); color: #fff; }
.boton-primario:hover { filter: brightness(1.1); }
.boton-secundario { background: var(--panel); color: var(--tinta); border-color: var(--borde); }
.boton-secundario:hover { border-color: var(--acento); color: var(--acento); }

.cifras {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 12px;
  margin: 34px 0 6px;
}

.cifra {
  background: var(--panel);
  border: 1px solid var(--borde);
  border-radius: var(--radio);
  padding: 16px 18px;
  display: flex;
  flex-direction: column;
}

.cifra strong { font-size: 1.7rem; color: var(--acento); }
.cifra span { color: var(--tinta-suave); font-size: .85rem; }

/* ----------------------- Tarjetas de módulo ----------------------- */

.rejilla-categorias {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(255px, 1fr));
  gap: 14px;
}

.tarjeta-categoria {
  background: var(--panel);
  border: 1px solid var(--borde);
  border-top: 4px solid var(--cat-color, var(--acento));
  border-radius: var(--radio);
  padding: 18px;
  text-decoration: none;
  color: var(--tinta);
  display: flex;
  flex-direction: column;
  gap: 8px;
  box-shadow: var(--sombra);
  transition: transform .15s, border-color .15s;
}

.tarjeta-categoria:hover { transform: translateY(-3px); border-color: var(--cat-color); }

.cat-cabecera { display: flex; align-items: center; gap: 10px; }
.cat-icono { font-size: 1.5rem; }
.cat-cabecera h3 { margin: 0; font-size: 1.02rem; }
.cat-desc { margin: 0; color: var(--tinta-suave); font-size: .88rem; flex: 1; }

.cat-pie {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: .82rem;
}

.cat-contador { color: var(--tinta-suave); }
.cat-flecha { color: var(--cat-color, var(--acento)); font-weight: 700; }

/* ----------------------- Catálogo de fichas ----------------------- */

.controles-catalogo {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 14px;
}

.buscador { display: flex; gap: 10px; }

.buscador input {
  flex: 1;
  padding: 12px 16px;
  font-size: 1rem;
  border: 1px solid var(--borde);
  border-radius: 10px;
  background: var(--panel);
  color: var(--tinta);
}

.buscador input:focus { outline: 2px solid var(--acento); border-color: transparent; }

.filtros { display: flex; gap: 8px; flex-wrap: wrap; }

.chip {
  border: 1px solid var(--borde);
  background: var(--panel);
  color: var(--tinta);
  border-radius: 999px;
  padding: 6px 13px;
  font-size: .85rem;
  font-weight: 600;
  cursor: pointer;
  transition: all .15s;
}

.chip:hover { border-color: var(--chip-color, var(--acento)); }
.chip.activo { background: var(--chip-color, var(--acento)); border-color: var(--chip-color, var(--acento)); color: #fff; }
.chip-n { opacity: .65; font-weight: 400; }

.resumen-resultados { color: var(--tinta-suave); font-size: .88rem; margin: 4px 0 12px; }

.rejilla-leyes {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(290px, 1fr));
  gap: 14px;
}

.tarjeta-ley {
  background: var(--panel);
  border: 1px solid var(--borde);
  border-left: 4px solid var(--cat-color, var(--acento));
  border-radius: var(--radio);
  padding: 16px 18px;
  cursor: pointer;
  box-shadow: var(--sombra);
  transition: transform .15s, border-color .15s;
}

.tarjeta-ley:hover, .tarjeta-ley:focus-visible { transform: translateY(-3px); border-color: var(--cat-color); outline: none; }

.etiquetas { display: flex; gap: 6px; flex-wrap: wrap; margin-bottom: 8px; }

.insignia {
  display: inline-block;
  background: var(--cat-color, var(--acento));
  color: #fff;
  font-size: .72rem;
  font-weight: 700;
  border-radius: 999px;
  padding: 2px 10px;
}

.insignia-interactivo { background: var(--tinta-suave); }

.tarjeta-ley h3 { margin: 0 0 6px; font-size: 1.05rem; }
.enunciado { margin: 0 0 8px; color: var(--tinta-suave); font-size: .9rem; font-style: italic; }
.autoria { margin: 0; color: var(--tinta-suave); font-size: .8rem; }

.tarjeta-dia { border-left-width: 6px; }

.sin-resultados { grid-column: 1/-1; text-align: center; color: var(--tinta-suave); padding: 40px 0; }

/* ----------------------- Modal ----------------------- */

.modal-fondo {
  position: fixed;
  inset: 0;
  background: rgba(10, 18, 26, .55);
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding: 40px 16px;
  z-index: 100;
  overflow-y: auto;
}

.modal {
  background: var(--panel);
  border-top: 5px solid var(--cat-color, var(--acento));
  border-radius: var(--radio);
  max-width: 680px;
  width: 100%;
  padding: 28px 30px;
  position: relative;
  box-shadow: var(--sombra);
}

.modal h2 { margin: 0 0 4px; font-size: 1.45rem; }
.modal .meta { color: var(--tinta-suave); font-size: .88rem; margin: 0 0 14px; }

.modal blockquote {
  margin: 0 0 16px;
  padding: 12px 18px;
  border-left: 4px solid var(--cat-color, var(--acento));
  background: var(--acento-suave);
  border-radius: 0 10px 10px 0;
  font-style: italic;
}

.modal h4 { margin: 18px 0 6px; font-size: .95rem; color: var(--cat-color, var(--acento)); }
.modal p { margin: 0; font-size: .95rem; }

.modal-cerrar {
  position: absolute;
  top: 14px;
  right: 14px;
  border: 1px solid var(--borde);
  background: var(--panel);
  color: var(--tinta);
  border-radius: 999px;
  width: 34px;
  height: 34px;
  font-size: 1rem;
  cursor: pointer;
}

.clave-examen {
  margin-top: 16px;
  padding: 12px 16px;
  border-radius: 10px;
  background: var(--acento-suave);
  border: 1px dashed var(--cat-color, var(--acento));
  font-size: .92rem;
}

/* ----------------------- Fórmulas ----------------------- */

.grupo-formulas { margin-bottom: 10px; }

.rejilla-formulas {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 14px;
  margin-bottom: 26px;
}

.tarjeta-formula {
  background: var(--panel);
  border: 1px solid var(--borde);
  border-left: 4px solid var(--cat-color, var(--acento));
  border-radius: var(--radio);
  padding: 16px 18px;
  box-shadow: var(--sombra);
}

.tarjeta-formula h4 { margin: 0 0 8px; font-size: .95rem; }

.formula-cuerpo {
  font-family: "Cambria Math", Georgia, serif;
  font-size: 1.08rem;
  background: var(--acento-suave);
  border-radius: 8px;
  padding: 10px 14px;
  margin-bottom: 8px;
  overflow-x: auto;
  white-space: nowrap;
}

.formula-donde { color: var(--tinta-suave); font-size: .82rem; margin: 0 0 6px; }
.formula-nota { font-size: .85rem; margin: 0; }
.formula-nota::before { content: "💡 "; }

/* ----------------------- Paneles de estudio (tarjetas y quiz) ----------------------- */

.panel-estudio { max-width: 760px; margin: 0 auto; }

.panel-config {
  background: var(--panel);
  border: 1px solid var(--borde);
  border-radius: var(--radio);
  padding: 28px 30px;
  box-shadow: var(--sombra);
}

.panel-config h2 { margin-top: 0; }

.opciones-config { display: flex; gap: 8px; flex-wrap: wrap; margin: 10px 0 18px; }

.progreso-quiz {
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--tinta-suave);
  font-size: .88rem;
  margin-bottom: 10px;
}

.barra-progreso {
  height: 6px;
  background: var(--borde);
  border-radius: 999px;
  overflow: hidden;
  margin-bottom: 18px;
}

.barra-progreso > div { height: 100%; background: var(--acento); transition: width .3s; }

.tarjeta-pregunta {
  background: var(--panel);
  border: 1px solid var(--borde);
  border-radius: var(--radio);
  padding: 26px 28px;
  box-shadow: var(--sombra);
}

.tarjeta-pregunta h3 { margin: 0 0 18px; font-size: 1.08rem; line-height: 1.5; }

.opciones-quiz { display: flex; flex-direction: column; gap: 10px; }

.opcion-quiz {
  text-align: left;
  padding: 13px 16px;
  border: 1px solid var(--borde);
  border-radius: 10px;
  background: var(--fondo);
  color: var(--tinta);
  font-size: .95rem;
  cursor: pointer;
  transition: border-color .15s, background .15s;
}

.opcion-quiz:hover:not(:disabled) { border-color: var(--acento); }
.opcion-quiz.correcta { border-color: var(--exito); background: color-mix(in srgb, var(--exito) 12%, var(--panel)); font-weight: 700; }
.opcion-quiz.incorrecta { border-color: var(--error); background: color-mix(in srgb, var(--error) 12%, var(--panel)); }
.opcion-quiz:disabled { cursor: default; opacity: .92; }

.explicacion-quiz {
  margin-top: 16px;
  padding: 12px 16px;
  border-radius: 10px;
  background: var(--acento-suave);
  font-size: .9rem;
}

.acciones-quiz { display: flex; gap: 10px; margin-top: 18px; flex-wrap: wrap; }

.boton-sim {
  padding: 10px 18px;
  border-radius: 10px;
  border: 1px solid transparent;
  background: var(--acento);
  color: #fff;
  font-weight: 700;
  font-size: .92rem;
  cursor: pointer;
}

.boton-sim.secundario { background: var(--panel); color: var(--tinta); border-color: var(--borde); }
.boton-sim.secundario:hover { border-color: var(--acento); color: var(--acento); }

.resultado-quiz { text-align: center; padding: 10px 0; }
.resultado-quiz .marcador { font-size: 3rem; font-weight: 800; color: var(--acento); margin: 8px 0; }
.resultado-quiz .veredicto { font-size: 1.05rem; margin-bottom: 18px; }

.detalle-fallos { text-align: left; margin-top: 22px; }
.detalle-fallos h4 { margin-bottom: 8px; }
.fallo {
  border: 1px solid var(--borde);
  border-left: 4px solid var(--error);
  border-radius: 10px;
  padding: 12px 16px;
  margin-bottom: 10px;
  font-size: .88rem;
  background: var(--panel);
}

/* ----------------------- Tarjetas de repaso ----------------------- */

.flashcard {
  perspective: 1200px;
  cursor: pointer;
  margin-bottom: 16px;
}

.flashcard-interior {
  position: relative;
  min-height: 260px;
  transform-style: preserve-3d;
  transition: transform .5s;
}

.flashcard.volteada .flashcard-interior { transform: rotateY(180deg); }

.flashcard-cara {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  background: var(--panel);
  border: 1px solid var(--borde);
  border-top: 5px solid var(--cat-color, var(--acento));
  border-radius: var(--radio);
  padding: 26px 28px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  box-shadow: var(--sombra);
  overflow-y: auto;
}

.flashcard-cara.reverso { transform: rotateY(180deg); justify-content: flex-start; }

.flashcard-cara h3 { margin: 0 0 6px; font-size: 1.2rem; text-align: center; }
.flashcard-cara.reverso h3 { text-align: left; font-size: 1.02rem; }
.flashcard-pista { text-align: center; color: var(--tinta-suave); font-size: .82rem; margin-top: 14px; }
.flashcard-cara p { font-size: .92rem; margin: 0 0 8px; }

/* ----------------------- Pie ----------------------- */

.pie {
  border-top: 1px solid var(--borde);
  padding: 26px 20px 40px;
  text-align: center;
  color: var(--tinta-suave);
  font-size: .85rem;
}

.pie p { max-width: 860px; margin: 6px auto; }

/* ----------------------- Responsive ----------------------- */

@media (max-width: 640px) {
  .cabecera-contenido { padding: 8px 12px; }
  .nav-principal { order: 3; width: 100%; justify-content: center; margin-left: 0; }
  main { padding: 18px 14px 50px; }
  .modal { padding: 22px 18px; }
}