/* =============================================
   PLATAFORMA DE CURSOS — app.css
   Diseño ejecutivo, limpio, corporativo
   ============================================= */

:root {
  --color-primary:   #1A3A5C;   /* Azul corporativo profundo */
  --color-accent:    #2D7DD2;   /* Azul acción */
  --color-light:     #F7F8FA;
  --color-border:    #E2E6EA;
  --color-text:      #2C3E50;
  --color-muted:     #6C757D;
  --color-success:   #1A7A4A;
  --color-danger:    #B00020;
  --font-display:    'Lora', Georgia, serif;
  --font-body:       'Source Sans 3', system-ui, sans-serif;
  --radius:          6px;
  --shadow-card:     0 1px 4px rgba(0,0,0,.07), 0 0 0 1px rgba(0,0,0,.04);
  --transition:      all .18s ease;
}

* { box-sizing: border-box; }

body {
  font-family: var(--font-body);
  color: var(--color-text);
  background-color: var(--color-light);
  font-size: 15px;
  line-height: 1.65;
}

/* ---- TIPOGRAFÍA ---- */
h1, h2, h3, h4 {
  font-family: var(--font-display);
  color: var(--color-primary);
  font-weight: 600;
  line-height: 1.25;
}
.text-muted { color: var(--color-muted) !important; }
.text-primary { color: var(--color-primary) !important; }
.text-accent { color: var(--color-accent) !important; }

/* ---- NAVBAR ---- */
.navbar {
  padding: .875rem 0;
  box-shadow: 0 1px 0 var(--color-border);
}
.navbar-brand {
  font-family: var(--font-display);
  font-size: 1.2rem;
  color: var(--color-primary) !important;
  letter-spacing: .01em;
}
.nav-link {
  font-size: .875rem;
  font-weight: 600;
  letter-spacing: .03em;
  text-transform: uppercase;
  color: var(--color-muted) !important;
  padding: .5rem 1rem !important;
}
.nav-link:hover { color: var(--color-primary) !important; }

/* ---- HERO ---- */
.hero {
  background: linear-gradient(135deg, var(--color-primary) 0%, #254E7A 100%);
  color: #fff;
  padding: 4rem 0 3.5rem;
}
.hero h1 {
  color: #fff;
  font-size: 2.4rem;
  margin-bottom: .75rem;
}
.hero p {
  color: rgba(255,255,255,.8);
  font-size: 1.1rem;
  max-width: 520px;
}

/* ---- TARJETA DE CURSO ---- */
.course-card {
  background: #fff;
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: var(--transition);
  border: 1px solid var(--color-border);
  height: 100%;
}
.course-card:hover {
  box-shadow: 0 4px 16px rgba(0,0,0,.1);
  transform: translateY(-2px);
}
.course-card .card-img-top {
  height: 160px;
  object-fit: cover;
  background: var(--color-primary);
}
.course-card .card-img-placeholder {
  height: 160px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(255,255,255,.4);
  font-size: 2.5rem;
}
.course-card .card-body { flex: 1; padding: 1.25rem; }
.course-card .card-footer {
  background: #fff;
  border-top: 1px solid var(--color-border);
  padding: 1rem 1.25rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.course-card .categoria {
  font-size: .72rem;
  font-weight: 600;
  letter-spacing: .06em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: .35rem;
}
.course-card h5 {
  font-family: var(--font-display);
  font-size: 1.05rem;
  color: var(--color-primary);
  margin-bottom: .4rem;
}
.course-card .meta {
  font-size: .82rem;
  color: var(--color-muted);
  line-height: 1.7;
}
.course-card .precio {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--color-primary);
}
.cupos-badge {
  font-size: .75rem;
  font-weight: 600;
  padding: .25rem .6rem;
  border-radius: 20px;
}
.cupos-ok     { background: #E8F5EE; color: var(--color-success); }
.cupos-pocos  { background: #FFF3CD; color: #856404; }
.cupos-agotado{ background: #FDECEA; color: var(--color-danger); }

/* ---- BOTONES ---- */
.btn-primary {
  background-color: var(--color-accent);
  border-color: var(--color-accent);
  font-weight: 600;
  border-radius: var(--radius);
  padding: .55rem 1.5rem;
  letter-spacing: .02em;
  transition: var(--transition);
}
.btn-primary:hover {
  background-color: #235fa8;
  border-color: #235fa8;
}
.btn-outline-primary {
  color: var(--color-accent);
  border-color: var(--color-accent);
  font-weight: 600;
  border-radius: var(--radius);
}
.btn-outline-primary:hover {
  background-color: var(--color-accent);
}
.btn-dark {
  background-color: var(--color-primary);
  border-color: var(--color-primary);
  font-weight: 600;
  border-radius: var(--radius);
}

/* ---- FORMULARIOS ---- */
.form-control {
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-size: .9375rem;
  padding: .55rem .875rem;
  color: var(--color-text);
  background: #fff;
  transition: var(--transition);
}
.form-control:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(45,125,210,.12);
}
label {
  font-size: .8rem;
  font-weight: 600;
  letter-spacing: .04em;
  text-transform: uppercase;
  color: var(--color-muted);
  margin-bottom: .25rem;
}

/* ---- BADGES ---- */
.badge { font-size: .75rem; font-weight: 600; padding: .3em .7em; border-radius: 4px; }
.badge-success   { background: #E8F5EE; color: var(--color-success); }
.badge-warning   { background: #FFF3CD; color: #856404; }
.badge-danger    { background: #FDECEA; color: var(--color-danger); }
.badge-secondary { background: #E9ECEF; color: var(--color-muted); }
.badge-info      { background: #E7F3FD; color: var(--color-accent); }

/* ---- RESUMEN DE PAGO ---- */
.resumen-pago {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.5rem;
}
.resumen-pago .row-item {
  display: flex;
  justify-content: space-between;
  padding: .6rem 0;
  border-bottom: 1px solid var(--color-border);
  font-size: .9rem;
}
.resumen-pago .row-item:last-child { border-bottom: none; }
.resumen-pago .total {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-primary);
}

/* ---- CONFIRMACIÓN ---- */
.confirmacion-icon {
  width: 72px; height: 72px;
  border-radius: 50%;
  background: #E8F5EE;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  color: var(--color-success);
  margin: 0 auto 1.5rem;
}
.confirmacion-referencia {
  font-family: monospace;
  font-size: .85rem;
  background: var(--color-light);
  padding: .3rem .6rem;
  border-radius: 4px;
  color: var(--color-muted);
}

/* ---- FOOTER ---- */
.footer { font-size: .85rem; }

/* ---- SECCION FILTROS ---- */
.filtros-bar {
  background: #fff;
  border-bottom: 1px solid var(--color-border);
  padding: .875rem 0;
}
.filtros-bar .btn {
  font-size: .8rem;
  padding: .35rem .9rem;
  margin-right: .4rem;
  margin-bottom: .4rem;
}

/* ---- PÁGINAS INTERNAS ---- */
.page-header {
  background: #fff;
  border-bottom: 1px solid var(--color-border);
  padding: 2rem 0 1.5rem;
  margin-bottom: 2.5rem;
}
.page-header h1 { font-size: 1.8rem; margin-bottom: .25rem; }
.section-label {
  font-size: .72rem;
  font-weight: 700;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: .5rem;
}

/* ---- DETAIL VIEW ---- */
.detail-sidebar {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.5rem;
  position: sticky;
  top: 1.5rem;
}
.detail-sidebar .precio-grande {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 700;
  color: var(--color-primary);
}
.instructor-avatar {
  width: 48px; height: 48px;
  border-radius: 50%;
  background: var(--color-primary);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1.1rem;
  flex-shrink: 0;
}