/* Campus SD — sistema de diseño. Academia editorial sobria.
   Acento por tenant: se inyecta :root{--accent} inline en el layout. */
:root {
    --accent: #1f4e79;
    --accent-weak: color-mix(in srgb, var(--accent) 12%, #fff);
    --accent-soft: color-mix(in srgb, var(--accent) 6%, #fff);
    --ink: #1c2230;
    --muted: #66707f;
    --line: #e7e9ee;
    --bg: #f4f5f7;
    --surface: #ffffff;
    --ok: #1e7e34;
    --warn: #c98a00;
    --bad: #c0392b;
    --radius: 12px;
    --radius-sm: 8px;
    --shadow: 0 1px 2px rgba(20,30,50,.04), 0 8px 24px -16px rgba(20,30,50,.18);
    --sans: "Public Sans", system-ui, -apple-system, sans-serif;
    --serif: "Spectral", Georgia, serif;
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
    font-family: var(--sans);
    color: var(--ink);
    background: var(--bg);
    line-height: 1.55;
    font-size: 15px;
    -webkit-font-smoothing: antialiased;
}
h1, h2, h3 { font-family: var(--serif); font-weight: 600; line-height: 1.2; letter-spacing: -.01em; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ── App shell ─────────────────────────────────────────────── */
.app { display: grid; grid-template-columns: 248px 1fr; min-height: 100vh; }
.sidebar {
    background: var(--surface); border-right: 1px solid var(--line);
    padding: 1.1rem .8rem; position: sticky; top: 0; height: 100vh; overflow-y: auto;
}
.brand { display: flex; align-items: center; gap: .6rem; padding: .3rem .5rem 1.1rem; }
.brand img { height: 34px; width: auto; }
.brand .brand-name { font-family: var(--serif); font-weight: 600; font-size: 1.02rem; color: var(--ink); line-height: 1.15; }
.nav { display: flex; flex-direction: column; gap: 2px; }
.nav-section { font-size: .68rem; text-transform: uppercase; letter-spacing: .08em; color: var(--muted); padding: 1rem .7rem .35rem; }
.nav-item {
    display: flex; align-items: center; gap: .65rem; padding: .55rem .7rem; border-radius: var(--radius-sm);
    color: var(--ink); font-size: .92rem; font-weight: 500; text-decoration: none;
}
.nav-item:hover { background: var(--accent-soft); text-decoration: none; }
.nav-item.active { background: var(--accent-weak); color: var(--accent); }
.nav-item svg { width: 18px; height: 18px; flex: none; stroke: currentColor; }

.main { display: flex; flex-direction: column; min-width: 0; }
.topbar {
    height: 60px; background: var(--surface); border-bottom: 1px solid var(--line);
    display: flex; align-items: center; justify-content: space-between; padding: 0 1.6rem; position: sticky; top: 0; z-index: 5;
}
.topbar .page-title { font-family: var(--serif); font-size: 1.05rem; font-weight: 600; }
.topbar .right { display: flex; align-items: center; gap: 1.1rem; font-size: .9rem; }
.icon-link { display: inline-flex; align-items: center; gap: .35rem; color: var(--muted); position: relative; }
.icon-link svg { width: 20px; height: 20px; stroke: currentColor; }
.badge-count {
    position: absolute; top: -6px; right: -8px; background: var(--accent); color: #fff;
    font-size: .66rem; font-weight: 700; min-width: 16px; height: 16px; border-radius: 99px;
    display: flex; align-items: center; justify-content: center; padding: 0 4px;
}
.avatar { width: 32px; height: 32px; border-radius: 50%; background: var(--accent); color: #fff;
    display: flex; align-items: center; justify-content: center; font-weight: 700; font-size: .82rem; }
.content { padding: 2rem 1.6rem; max-width: 1080px; width: 100%; margin: 0 auto; }
.page-head { margin: 0 0 1.4rem; }
.page-head h1 { font-size: 1.7rem; margin: 0 0 .2rem; }
.page-head .sub { color: var(--muted); }

/* ── Auth shell (login/activar) ────────────────────────────── */
.auth-shell { min-height: 100vh; display: grid; place-items: center; padding: 2rem 1rem;
    background:
      radial-gradient(1200px 500px at 100% -10%, var(--accent-soft), transparent 60%),
      radial-gradient(900px 500px at -10% 110%, var(--accent-soft), transparent 55%), var(--bg); }
.auth-card { width: 100%; max-width: 400px; }
.auth-brand { text-align: center; margin-bottom: 1.3rem; }
.auth-brand img { height: 52px; }
.auth-brand .name { font-family: var(--serif); font-size: 1.15rem; margin-top: .5rem; color: var(--ink); }

/* ── Cards ─────────────────────────────────────────────────── */
.card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
    padding: 1.4rem 1.5rem; box-shadow: var(--shadow); }
.card + .card { margin-top: 1.1rem; }
.card-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: .9rem; }
.card-head h2 { font-size: 1.1rem; margin: 0; }

/* ── Buttons ───────────────────────────────────────────────── */
.btn { display: inline-flex; align-items: center; gap: .5rem; padding: .58rem 1.05rem; border-radius: var(--radius-sm);
    font-family: var(--sans); font-size: .92rem; font-weight: 600; cursor: pointer; border: 1px solid transparent; text-decoration: none; line-height: 1; }
.btn:hover { text-decoration: none; }
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { filter: brightness(.94); }
.btn-ghost { background: var(--surface); color: var(--ink); border-color: var(--line); }
.btn-ghost:hover { background: var(--accent-soft); }
.btn-sm { padding: .4rem .75rem; font-size: .84rem; }
.btn-block { width: 100%; justify-content: center; }

/* ── Forms ─────────────────────────────────────────────────── */
.label { display: block; font-size: .82rem; font-weight: 600; color: var(--muted); margin: .85rem 0 .3rem; }
.input, .select, .textarea {
    width: 100%; padding: .6rem .7rem; border: 1px solid var(--line); border-radius: var(--radius-sm);
    font-family: var(--sans); font-size: .92rem; color: var(--ink); background: #fff; }
.input:focus, .select:focus, .textarea:focus { outline: none; border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-weak); }
.field-row { display: flex; gap: .55rem; flex-wrap: wrap; align-items: flex-end; }

/* ── Badges / alerts ───────────────────────────────────────── */
.badge { display: inline-block; font-size: .74rem; font-weight: 700; padding: .18rem .55rem; border-radius: 99px;
    background: #eef0f3; color: var(--muted); text-transform: capitalize; }
.badge.ok { background: #e6f4ea; color: var(--ok); }
.badge.draft { background: #f3f0e6; color: var(--warn); }
.alert { padding: .7rem 1rem; border-radius: var(--radius-sm); font-size: .9rem; margin-bottom: 1.2rem; border: 1px solid; }
.alert.success { background: #e9f6ee; border-color: #bfe3cb; color: var(--ok); }
.alert.error { background: #fdeceb; border-color: #f3c6c2; color: var(--bad); }

/* ── Course cards grid ─────────────────────────────────────── */
.course-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(248px, 1fr)); gap: 1.1rem; }
.course-card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
    overflow: hidden; box-shadow: var(--shadow); display: flex; flex-direction: column; transition: transform .12s ease, box-shadow .12s ease; }
.course-card:hover { transform: translateY(-2px); box-shadow: 0 6px 28px -14px rgba(20,30,50,.32); text-decoration: none; }
.course-card .banner { height: 84px; background: linear-gradient(120deg, var(--accent), color-mix(in srgb, var(--accent) 55%, #000)); }
.course-card .body { padding: .9rem 1rem 1.1rem; flex: 1; display: flex; flex-direction: column; }
.course-card .title { font-family: var(--serif); font-weight: 600; font-size: 1.05rem; color: var(--ink); margin: 0 0 .3rem; }
.course-card .desc { color: var(--muted); font-size: .86rem; flex: 1; }

/* ── Progress bar ──────────────────────────────────────────── */
.progress { background: #eceef2; border-radius: 99px; height: 8px; overflow: hidden; }
.progress > span { display: block; height: 100%; background: var(--accent); border-radius: 99px; }

/* ── Activity / list rows ──────────────────────────────────── */
.act-row { display: flex; align-items: center; gap: .8rem; padding: .65rem 0; border-bottom: 1px solid var(--line); }
.act-row:last-child { border-bottom: 0; }
.tick { width: 20px; height: 20px; border-radius: 50%; border: 2px solid #ccd2db; flex: none; }
.tick.done { background: var(--accent); border-color: var(--accent); }
.act-type { font-size: .72rem; color: var(--muted); text-transform: uppercase; letter-spacing: .04em; }
.list-row { padding: .6rem 0; border-bottom: 1px solid var(--line); display: flex; justify-content: space-between; align-items: center; }
.list-row:last-child { border-bottom: 0; }
.muted { color: var(--muted); }
.section-title { font-family: var(--serif); font-size: 1.15rem; margin: 0 0 .6rem; }
table.grid { width: 100%; border-collapse: collapse; font-size: .9rem; }
table.grid th { text-align: left; padding: .55rem .5rem; border-bottom: 2px solid var(--line); font-weight: 700; }
table.grid td { padding: .55rem .5rem; border-bottom: 1px solid var(--line); }

@media (max-width: 760px) {
    .app { grid-template-columns: 1fr; }
    .sidebar { position: static; height: auto; display: flex; flex-wrap: wrap; gap: .3rem; }
    .sidebar .nav { flex-direction: row; flex-wrap: wrap; }
    .nav-section { display: none; }
    .content { padding: 1.2rem; }
}

/* ── Dashboard enriquecido ─────────────────────────────────── */
.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 1rem; margin-bottom: 1.4rem; }
.stat { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 1.1rem 1.2rem; box-shadow: var(--shadow); }
.stat .num { font-family: var(--serif); font-size: 1.9rem; font-weight: 700; line-height: 1; color: var(--accent); }
.stat .lbl { color: var(--muted); font-size: .82rem; margin-top: .3rem; }

.layout-2col { display: grid; grid-template-columns: 1fr 326px; gap: 1.3rem; align-items: start; }
@media (max-width: 900px) { .layout-2col { grid-template-columns: 1fr; } }

.widget { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 1.1rem 1.2rem; box-shadow: var(--shadow); }
.widget + .widget { margin-top: 1.1rem; }
.widget h3 { font-size: 1rem; margin: 0 0 .8rem; }

/* course card: progreso + meta dentro */
.course-card .meta { color: var(--muted); font-size: .78rem; margin-top: .5rem; display: flex; align-items: center; gap: .5rem; }
.course-card .progress { margin-top: .7rem; }
.course-card .banner { position: relative; display: flex; align-items: flex-end; padding: .6rem .8rem; }
.course-card .banner .ini { font-family: var(--serif); font-weight: 700; color: rgba(255,255,255,.92); font-size: 1.5rem; letter-spacing: .02em; }
.course-card .banner.h0 { background: linear-gradient(120deg, #1f4e79, #11324f); }
.course-card .banner.h1 { background: linear-gradient(120deg, #c0392b, #7d231b); }
.course-card .banner.h2 { background: linear-gradient(120deg, #16734d, #0c5036); }
.course-card .banner.h3 { background: linear-gradient(120deg, #7a4ea6, #4a2f66); }
.course-card .banner.h4 { background: linear-gradient(120deg, #b8860b, #7a5908); }
.course-card .banner.h5 { background: linear-gradient(120deg, #2c7a8c, #1a4a55); }

/* timeline / listas de widget */
.tl-item { display: flex; gap: .7rem; padding: .55rem 0; border-bottom: 1px solid var(--line); }
.tl-item:last-child { border-bottom: 0; }
.tl-date { text-align: center; min-width: 42px; }
.tl-date .d { font-family: var(--serif); font-weight: 700; font-size: 1.15rem; line-height: 1; }
.tl-date .m { font-size: .64rem; text-transform: uppercase; color: var(--muted); }
.tl-body { flex: 1; font-size: .88rem; }
.tl-body .sub { color: var(--muted); font-size: .78rem; }

/* íconos por tipo de actividad */
.act-ico { width: 32px; height: 32px; border-radius: 8px; background: var(--accent-weak); display: flex; align-items: center; justify-content: center; flex: none; }
.act-ico svg { width: 17px; height: 17px; stroke: var(--accent); fill: none; }

/* banner de curso (hero) */
.course-hero { border-radius: var(--radius); padding: 1.6rem 1.7rem; color: #fff; margin-bottom: 1.3rem;
    background: linear-gradient(120deg, var(--accent), color-mix(in srgb, var(--accent) 55%, #000)); box-shadow: var(--shadow); }
.course-hero h1 { color: #fff; margin: 0 0 .25rem; font-size: 1.7rem; }
.course-hero .sub { color: rgba(255,255,255,.85); font-size: .92rem; }
.crumbs { font-size: .82rem; color: var(--muted); margin-bottom: .7rem; }
.crumbs a { color: var(--muted); }

/* ── Contenido de lecciones (Markdown renderizado) ── */
.md-contenido { line-height: 1.75; }
.md-contenido h2, .md-contenido h3, .md-contenido h4 { margin: 1.6rem 0 .5rem; line-height: 1.3; }
.md-contenido p { margin: 0 0 .9rem; }
.md-contenido ul, .md-contenido ol { margin: 0 0 .9rem 1.3rem; }
.md-contenido li { margin: .25rem 0; }
.md-contenido a { color: var(--accent); }
.md-contenido img { max-width: 100%; height: auto; border-radius: var(--radius-sm); margin: .5rem 0; }
.md-contenido blockquote { margin: 0 0 .9rem; padding: .5rem 1rem; border-left: 3px solid var(--accent); color: var(--muted); }
.md-contenido hr { border: 0; border-top: 1px solid var(--line); margin: 1.6rem 0; }
.md-contenido code { background: var(--bg-alt, #f4f4f5); padding: .1em .35em; border-radius: 4px; font-size: .92em; }
.md-code { background: var(--bg-alt, #f4f4f5); padding: .9rem 1rem; border-radius: var(--radius-sm); overflow-x: auto; }
.md-code code { background: none; padding: 0; }
/* El video mantiene proporción 16:9 y nunca desborda en el celular. */
.md-video { position: relative; padding-top: 56.25%; margin: 1rem 0; }
.md-video iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; border-radius: var(--radius-sm); }

/* ── Barra del editor ── */
.md-barra { display: flex; flex-wrap: wrap; gap: .25rem; margin-bottom: .4rem; }
.md-btn { font: inherit; font-size: .85rem; line-height: 1; padding: .4rem .55rem; min-width: 2rem;
          border: 1px solid var(--line); border-radius: var(--radius-sm); background: #fff; cursor: pointer; color: inherit; }
.md-btn:hover { border-color: var(--accent); }
.md-btn-ver { margin-left: auto; }
.md-preview { border: 1px dashed var(--line); border-radius: var(--radius-sm); padding: 1rem; }
.md-ayuda { font-size: .8rem; color: var(--muted); margin: .35rem 0 0; }

/* Buscador de la topbar. En pantallas chicas se esconde: el ítem del nav alcanza. */
.topbar-buscar .input { margin: 0; width: 13rem; padding: .35rem .6rem; font-size: .88rem; }
@media (max-width: 760px) { .topbar-buscar { display: none; } }