/* ================== RESET ================== */
 * {
   padding: 0;
   margin: 0;
   box-sizing: border-box;
 }

 html {
   overflow-x: hidden;
 }

 body {
   background-color: #f9f9f9;
   font-family: Montserrat, sans-serif;
   color: #333;
 }

 /* ================== COLORES ================== */
 :root {
   --institucional: #7a1333;
   --dorado: #d9c093;
   --blanco: #ffffff;
   --negro: #000000;
 }

 .container-normatividad {
   max-width: 1200px;
   margin: auto;
   padding: 20px;
 }

 /* ================== TITULOS ================== */
 .titulo-principal {
   color: var(--institucional);
   text-align: center;
   font-size: 2.2rem;
   font-weight: bold;
   margin: 50px 0 30px;
   position: relative;
 }

 .titulo-principal::after {
   content: "";
   width: 80px;
   height: 4px;
   background: var(--dorado);
   display: block;
   margin: 10px auto 0;
   border-radius: 2px;
 }

 /* ===== BUSCADOR ===== */
 .search-box {
   max-width: 500px;
   margin: 20px auto 40px;
   display: flex;
   align-items: center;
   background: #fff;
   border: 2px solid #7a1333;
   border-radius: 50px;
   padding: 8px 16px;
   box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
   transition: all 0.3s ease;
 }

 .search-box:focus-within {
   border-color: #d9c093;
   box-shadow: 0 6px 16px rgba(122, 19, 51, 0.2);
 }

 .search-box input {
   border: none;
   outline: none;
   flex: 1;
   font-size: 1rem;
   padding: 8px;
 }

 .search-box i {
   color: #7a1333;
   margin-right: 10px;
   font-size: 1.2rem;
 }

 /* Animación de las cards al filtrar */

 .pdf-card {
   transition: opacity 0.3s ease, transform 0.3s ease;
 }

 .pdf-card.hidden {
   opacity: 0;
   /* invisible */
   visibility: hidden;
   /* no accesible */
   pointer-events: none;
   /* no clickeable */
   display: none !important;
   /* las elimina del flujo */
 }

 /* ===== BOTÓN VOLVER ARRIBA ===== */
 #btnTop {
   position: fixed;
   bottom: 25px;
   left: 25px;
   background-color: #ffff;
   color: #7a1333;
   border: none;
   outline: none;
   width: 45px;
   height: 45px;
   font-weight: 400;
   border-radius: 50%;
   font-size: 22px;
   cursor: pointer;
   box-shadow: 0 4px 10px rgb(0 0 0 / 30%);
   display: none;
   transition: all 0.3s ease;
   z-index: 999;
 }

 #btnTop:hover {
   background-color: #d9c093;
   color: #7a1333;
   transform: scale(1.1);
 }


 .pdf-grid {
   display: grid;
   grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
   gap: 2rem;
 }

 .pdf-card {
   background: var(--blanco);
   border-radius: 16px;
   box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
   overflow: hidden;
   transition: transform 0.3s ease, box-shadow 0.3s ease;
 }

 .pdf-card:hover {
   transform: translateY(-5px);
   box-shadow: 0 8px 20px rgba(0, 0, 0, 0.2);
 }

 .pdf-card iframe {
   width: 100%;
   height: 350px;
   border: none;
 }

 .pdf-info {
   padding: 1rem;
   text-align: center;
 }

 .pdf-info h3 {
   font-size: 1.1rem;
   margin-bottom: 0.5rem;
   color: var(--institucional);
 }

 .download-btn {
   display: inline-block;
   padding: 0.5rem 1rem;
   background-color: var(--institucional);
   color: var(--blanco);
   border-radius: 8px;
   text-decoration: none;
   transition: background-color 0.3s ease;
 }

 .download-btn:hover {
   background-color: var(--dorado);
   color: var(--negro);
 }