:root{
  --sidebar-width: 260px;
  --bg-top: #000072;
  --bg-bottom: #0000FE;
  --accent: rgba(255,255,255,0.1);
  --text: #ffffff;
  --muted: rgba(255,255,255,0.85);
  --hover: rgba(255,255,255,0.06);
}

*{box-sizing:border-box}
html,body{height:100%;margin:0;font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial;}
body{display:flex;background:#f4f7fb;color:#222;}

/* Sidebar */
.sidebar{
  width:var(--sidebar-width);
  min-height:100vh;
  background: linear-gradient(180deg, var(--bg-top), var(--bg-bottom));
  color:var(--text);
  padding:20px 12px;
  box-shadow:2px 0 8px rgba(0,0,0,0.15);
}

.brand{
  padding:10px 12px;
  margin-bottom:18px;
  text-align:left;
}
.brand-title{
  font-weight:700;
  font-size:18px;
  color:#eaf6ff;
  padding:8px 10px;
  border-radius:6px;
}

/* Menu */
.menu{list-style:none;padding:0;margin:0;}
.menu-item{margin:6px 0;}
.menu-toggle, .single-link{
  width:100%;
  display:flex;
  gap:10px;
  align-items:center;
  padding:12px;
  background:transparent;
  border:0;
  color:var(--muted);
  text-align:left;
  font-size:15px;
  cursor:pointer;
  border-radius:8px;
}
.menu-toggle:focus, .single-link:focus{outline:2px solid rgba(255,255,255,0.12); outline-offset:2px;}
.menu-toggle:hover, .single-link:hover{background:var(--hover); color:var(--text);}

.icon{width:28px; text-align:center; font-size:16px; color:var(--text); opacity:0.9}
.label{flex:1}
.caret{font-size:12px; color:var(--text); opacity:0.85; transition:transform .18s ease}

/* Submenu */
.submenu{
  margin-top:6px;
  margin-left:36px;
  list-style:none;
  padding:6px 0;
  transition: max-height 220ms ease, opacity 200ms ease;
}
.submenu[hidden]{display:none}
.submenu li a{
  display:block;
  padding:8px 12px;
  color:var(--muted);
  text-decoration:none;
  border-radius:6px;
  font-size:14px;
}
.submenu li a:hover{background:var(--accent); color:var(--text);}

/* caret rotated when expanded - JS will add .expanded class on button */
.menu-toggle[aria-expanded="true"] .caret{transform:rotate(180deg)}

/* single link style */
.single-link{display:flex; align-items:center; gap:10px; padding:12px; color:var(--muted); text-decoration:none; border-radius:8px}
.single-link:hover{background:var(--hover); color:var(--text)}

/* content area */
.content{flex:1;padding:28px}



/* BUSCADOR */
#search-bar{
    font-size: 16px;
    font-weight: 600;
    width: 200px;
    padding: 5px;
    border-radius: 10px;
    outline: none;
    transition: width 0.4s ease-in-out;
    margin-bottom: 50px;
}
#search-bar:focus{
    width: 500px;
    box-shadow: 0 0 8px rgb(0,123,255,0.3);
}

/* MAIN: CURSOS */
.maincontent{
  width: 100%;
  display: grid;
  grid-template-columns: repeat(5,250px);
  justify-content: center;
}

/* ESTILO DE CONTENEDORES */
.contenedores{
  width: 200px;
  height: auto;
  display: flex;
  text-align: center;
  flex-direction: column;
  align-items: center;
  box-shadow: 0 0 8px rgba(131, 131, 131, 0.3);
  margin-bottom: 30px;
}
.contenedores a{
  color: black;
  font-weight: 600;
  font-size: 20px;
}
.contenedores img{
  width: 160px;
}
.contenedores div{
  display: flex;
  gap: 15px;
}
.contenedores button{
  background-color: transparent;
  font-size: 18px;
  border: none;
  cursor: pointer;
}


/* Modal simple */
#pdfModal {
  position: fixed;
  inset: 0;
  display: none;
  align-items: center;
  justify-content: center;
  background: rgba(0,0,0,0.6);
  z-index: 9999;
}
#pdfModal.open { display: flex; }
.modal-content {
  width: 90%;
  max-width: 1000px;
  height: 85%;
  background: #fff;
  border-radius: 6px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}
.modal-header {
  display:flex;
  justify-content: space-between;
  align-items: center;
  padding: 8px 12px;
  background: #f4f4f4;
  border-bottom: 1px solid #ddd;
}
.modal-body { flex: 1; }
.modal-body iframe {
  width: 100%;
  height: 100%;
  border: 0;
}
.close-btn {
  background: #e74c3c;
  color: white;
  border: none;
  padding: 6px 10px;
  border-radius: 4px;
  cursor: pointer;
}