/* ExamRobotic — páginas de contenido (portada, teoría, legales) */

:root {
    --er-dark: #0b2040;
    --er-blue: #1a6fd4;
    --er-blue-soft: #eff6ff;
    --er-bg: #f9fafb;
    --er-card: #ffffff;
    --er-text: #1e293b;
    --er-muted: #64748b;
    --er-border: #d1dce5;
    --er-green: #10b981;
    --er-amber: #f59e0b;
    --er-red: #ef4444;
    --er-radius: 16px;
    --er-max: 1080px;
    --er-read: 760px;
}

[data-theme="dark"] {
    --er-dark: #e2e8f0;
    --er-blue: #60a5fa;
    --er-blue-soft: #1e3a8a;
    --er-bg: #0f172a;
    --er-card: #1e293b;
    --er-text: #e2e8f0;
    --er-muted: #94a3b8;
    --er-border: #334155;
}

*, *::before, *::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
    margin: 0;
    font-family: 'Inter', system-ui, -apple-system, 'Segoe UI', sans-serif;
    background: var(--er-bg);
    color: var(--er-text);
    line-height: 1.65;
    font-size: 17px;
}

a { color: var(--er-blue); }
img, svg { max-width: 100%; height: auto; }

.contenedor { max-width: var(--er-max); margin: 0 auto; padding: 0 16px; }
.lectura { max-width: var(--er-read); margin: 0 auto; padding: 0 16px; }

/* ---------- Cabecera ---------- */
.cabecera {
    position: sticky; top: 0; z-index: 50;
    background: color-mix(in srgb, var(--er-card) 94%, transparent);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--er-border);
}
.cabecera .contenedor {
    display: flex; align-items: center; justify-content: space-between;
    gap: 12px; min-height: 60px;
}
.marca {
    display: flex; align-items: center; gap: 10px;
    text-decoration: none; color: var(--er-dark); font-weight: 800; font-size: 1.1rem;
}
.marca img { width: 32px; height: 32px; }
.menu { display: flex; align-items: center; gap: 18px; font-size: 0.95rem; }
.menu a { color: var(--er-text); text-decoration: none; font-weight: 600; }
.menu a:hover { color: var(--er-blue); }
.boton-tema {
    border: 1px solid var(--er-border); background: var(--er-card); color: var(--er-text);
    border-radius: 999px; width: 38px; height: 38px; cursor: pointer;
    display: inline-flex; align-items: center; justify-content: center; padding: 0;
}
.boton-tema:hover { color: var(--er-blue); border-color: var(--er-blue); }
.boton-tema span { display: inline-flex; }
.boton-tema .si-oscuro { display: none; }
[data-theme="dark"] .boton-tema .si-claro { display: none; }
[data-theme="dark"] .boton-tema .si-oscuro { display: inline-flex; }
.timer-box svg { flex-shrink: 0; }
@media (max-width: 640px) {
    .menu .solo-escritorio { display: none; }
}

/* ---------- Portada ---------- */
.portada { padding: 56px 0 32px; }
.portada h1 {
    font-size: clamp(1.8rem, 5vw, 2.8rem); line-height: 1.15; margin: 0 0 16px;
    color: var(--er-dark); letter-spacing: -0.02em;
}
.portada p.entradilla { font-size: 1.15rem; color: var(--er-muted); max-width: 680px; margin: 0 0 24px; }
.boton {
    display: inline-block; background: var(--er-blue); color: #fff; text-decoration: none;
    font-weight: 700; padding: 12px 22px; border-radius: 12px; border: none; cursor: pointer;
}
.boton:hover { filter: brightness(1.08); }
.boton.secundario { background: transparent; color: var(--er-blue); border: 2px solid var(--er-blue); }

.recorrido {
    display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; margin: 32px 0 8px;
}
.recorrido .paso {
    background: var(--er-card); border: 1px solid var(--er-border); border-radius: var(--er-radius);
    padding: 18px; position: relative;
}
.recorrido .paso b { display: block; font-size: 1.05rem; color: var(--er-dark); }
.recorrido .paso span { color: var(--er-muted); font-size: 0.92rem; }
.recorrido .paso:not(:last-child)::after {
    content: "→"; position: absolute; right: -12px; top: 50%; transform: translateY(-50%);
    color: var(--er-blue); font-weight: 900; font-size: 1.2rem;
}
@media (max-width: 720px) {
    .recorrido { grid-template-columns: 1fr; }
    .recorrido .paso:not(:last-child)::after { content: "↓"; right: 50%; top: auto; bottom: -18px; transform: none; }
}

.etapa { margin: 44px 0 0; }
.etapa h2 { font-size: 1.5rem; margin: 0 0 4px; color: var(--er-dark); }
.etapa .sub { color: var(--er-muted); margin: 0 0 18px; }

.rejilla {
    display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 16px;
}
.tarjeta {
    display: flex; flex-direction: column; gap: 8px;
    background: var(--er-card); border: 1px solid var(--er-border); border-radius: var(--er-radius);
    padding: 20px; text-decoration: none; color: var(--er-text);
    transition: transform 0.15s ease, border-color 0.15s ease;
}
a.tarjeta:hover { transform: translateY(-2px); border-color: var(--er-blue); }
.tarjeta .icono {
    width: 46px; height: 46px; border-radius: 12px;
    display: flex; align-items: center; justify-content: center;
    background: var(--er-blue-soft); color: var(--er-blue);
}
.tarjeta.proximamente .icono { background: transparent; border: 1px solid var(--er-border); color: var(--er-muted); }
.tarjeta h3 { margin: 0; font-size: 1.1rem; color: var(--er-dark); }
.tarjeta p { margin: 0; color: var(--er-muted); font-size: 0.95rem; }
.tarjeta .pie { margin-top: auto; display: flex; justify-content: space-between; align-items: center; font-size: 0.85rem; }
.etiqueta {
    display: inline-block; font-size: 0.75rem; font-weight: 800; letter-spacing: 0.04em;
    text-transform: uppercase; padding: 3px 10px; border-radius: 999px;
    background: var(--er-blue-soft); color: var(--er-blue);
}
.tarjeta.proximamente { opacity: 0.55; }
.tarjeta.proximamente .etiqueta { background: transparent; border: 1px dashed var(--er-border); color: var(--er-muted); }

.bloque { background: var(--er-card); border: 1px solid var(--er-border); border-radius: var(--er-radius); padding: 24px; margin: 40px 0 0; }
.bloque h2 { margin-top: 0; }
.tres { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 20px; }
.tres h3 { margin: 0 0 6px; font-size: 1.05rem; color: var(--er-dark); }
.tres p { margin: 0; color: var(--er-muted); }

/* ---------- Páginas de teoría ---------- */
.migas { font-size: 0.85rem; color: var(--er-muted); margin: 24px 0 8px; }
.migas a { color: var(--er-muted); }
.articulo h1 { font-size: clamp(1.6rem, 4.5vw, 2.3rem); line-height: 1.2; margin: 8px 0 12px; color: var(--er-dark); }
.datos-modulo { display: flex; flex-wrap: wrap; gap: 8px; margin: 0 0 24px; }
.articulo h2 { font-size: 1.4rem; margin: 40px 0 10px; color: var(--er-dark); }
.articulo h3 { font-size: 1.12rem; margin: 26px 0 8px; color: var(--er-dark); }
.articulo p, .articulo li { color: var(--er-text); }
.articulo ul, .articulo ol { padding-left: 1.3em; }
.articulo code {
    font-family: ui-monospace, 'Cascadia Code', Consolas, monospace; font-size: 0.92em;
    background: var(--er-blue-soft); padding: 1px 6px; border-radius: 6px;
}
.articulo pre {
    background: #0b2040; color: #e2e8f0; padding: 16px; border-radius: 12px; overflow-x: auto;
    font-size: 0.9rem; line-height: 1.5;
}
.articulo pre code { background: none; padding: 0; color: inherit; }
.articulo .neg { text-decoration: overline; }

.tabla-envoltorio { overflow-x: auto; margin: 16px 0; }
.articulo table { border-collapse: collapse; min-width: 280px; background: var(--er-card); }
.articulo th, .articulo td { border: 1px solid var(--er-border); padding: 8px 14px; text-align: center; }
.articulo th { background: var(--er-blue-soft); color: var(--er-blue); }
.articulo table.izquierda td, .articulo table.izquierda th { text-align: left; }

figure.esquema {
    margin: 24px 0; padding: 16px; background: var(--er-card);
    border: 1px solid var(--er-border); border-radius: var(--er-radius); text-align: center;
}
figure.esquema svg { width: 100%; max-width: 640px; }
figure.esquema figcaption { font-size: 0.88rem; color: var(--er-muted); margin-top: 8px; }
/* Los SVG usan currentColor para seguir el tema claro/oscuro */
figure.esquema svg { color: var(--er-text); }

.nota, .error-tipico, .en-obra {
    border-radius: 12px; padding: 14px 18px; margin: 20px 0; border-left: 5px solid;
}
.nota { background: var(--er-blue-soft); border-color: var(--er-blue); }
.error-tipico { background: #fef2f2; border-color: var(--er-red); color: #450a0a; }
.en-obra { background: #fffbeb; border-color: var(--er-amber); color: #451a03; }
[data-theme="dark"] .error-tipico { background: #3b0d0d; color: #fecaca; }
[data-theme="dark"] .en-obra { background: #3a2a05; color: #fde68a; }
.nota b:first-child, .error-tipico b:first-child, .en-obra b:first-child { display: block; margin-bottom: 4px; }

.llamada-test {
    margin: 48px 0; padding: 28px; border-radius: var(--er-radius);
    background: var(--er-dark); color: #fff; text-align: center;
}
[data-theme="dark"] .llamada-test { background: #1e3a8a; }
.llamada-test h2 { color: #fff; margin: 0 0 8px; }
.llamada-test p { color: #cbd5e1; margin: 0 0 18px; }
.llamada-test .boton { background: var(--er-green); }

.siguiente { display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; margin: 0 0 48px; }

/* ---------- Pie ---------- */
.pie-sitio { border-top: 1px solid var(--er-border); margin-top: 64px; padding: 28px 0 40px; color: var(--er-muted); font-size: 0.9rem; }
.pie-sitio .contenedor { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 16px; }
.pie-sitio nav { display: flex; flex-wrap: wrap; gap: 16px; }
.pie-sitio a { color: var(--er-muted); }

/* ---------- Barra del test ---------- */
.barra-test {
    max-width: 1000px; margin: 16px auto 0; padding: 0 20px;
    display: flex; flex-wrap: wrap; gap: 8px; align-items: center; justify-content: space-between;
    font-size: 0.85rem; color: #64748b;
}
.barra-test .numeros { display: flex; gap: 6px; flex-wrap: wrap; align-items: center; }
.barra-test button {
    border: 1px solid #d1dce5; background: #fff; border-radius: 8px; padding: 4px 12px;
    font-weight: 700; cursor: pointer; color: #0b2040;
}
.barra-test button.activo { background: #1a6fd4; color: #fff; border-color: #1a6fd4; }
[data-theme="dark"] .barra-test button { background: #1e293b; color: #e2e8f0; border-color: #334155; }
[data-theme="dark"] .barra-test button.activo { background: #3b82f6; border-color: #3b82f6; }
.aviso-test { max-width: 1000px; margin: 0 auto 32px; padding: 0 20px; font-size: 0.85rem; color: #64748b; }