:root{
  /* Paleta pastel damasco (apricot) */
  --bg:#fffdfb;
  --section:#fbefe6;      /* fondo general damasco muy suave */
  --panel:#fff7f1;        /* paneles claros */
  --line:#e8d4c6;         /* borde cálido */
  --ink:#2b2420;          /* texto oscuro cálido */
  --muted:#6b5b52;        /* texto secundario */

  --accent:#9a5b3c;       /* damasco tostado para botones */
  --accent-hover:#844a30; /* hover */
}

/* ===== Reset mínimo ===== */
*{ box-sizing:border-box }

body{
  margin:0;
  font-family: Arial, Helvetica, sans-serif;
  background:var(--section);
  color:var(--ink);
  line-height:1.55;
}

a{ color:inherit; text-decoration:none; }
a:hover{ text-decoration:underline; }

/* ===== Barra superior fija ===== */
.app-topbar{
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 50;

  background-image: url("assets/topbar-bg.png");
  background-repeat: no-repeat;
  background-position: center center;
  background-size: cover;

  border-bottom:1px solid var(--line);
}

.app-topbar-inner{
  max-width:1100px;
  margin:0 auto;
  padding:10px 16px;
  min-height:70px;

  display:grid;
  grid-template-columns: 1fr 1.6fr 1fr;
  align-items:center;
  gap:16px;
}


.app-topbar-title{
  width: 100%;           /* Asegura que ocupe todo el ancho de la columna */
  font-weight: 600;
  font-size: 14px;
  text-align: center;    /* Centrado horizontal del texto */
  
  background:rgba(255,253,251,0.80);
  border: 1px solid rgba(232,212,198,0.85);
  padding: 8px 12px;
  border-radius: 6px;
}

.app-topbar-nav{
  display:flex;
  gap:8px;
  flex-wrap:wrap;
}

.navbtn{
  padding:8px 10px;
  border-radius:6px;
  border:1px solid rgba(232,212,198,0.90);
  background:rgba(255,253,251,0.80);
}
.navbtn:hover{
  background:#fffdfb;
  text-decoration:none;
}

/* ===== Shell principal ===== */
.app-shell{
  max-width:1100px;
  margin:0 auto;
  padding:16px;
  padding-top:70px;   /* espacio exacto para la topbar */
  height:100vh;

  display:grid;
  grid-template-columns:1fr 1.6fr 1fr;
  gap:16px;
}

/* ===== Columnas ===== */
.app-col{
  background:var(--bg);
  border:1px solid var(--line);
  border-radius:8px;      /* menos redondeado */
  padding:14px;

  overflow:auto;          /* scroll interno */
  min-height:0;
}

/* ===== Columna izquierda ===== */
.app-h1{
  margin:0 0 12px 0;
  font-size:18px;
}

.app-stack{
  display:flex;
  flex-direction:column;
  gap:10px;
  margin-bottom:14px;
}

.btn2{
  display:block;
  text-align:center;
  padding:10px 12px;
  border-radius:6px;              /* menos redondeado */
  background:var(--accent);
  color:#fffdfb;
  border:1px solid var(--accent);
}
.btn2:hover{
  background:var(--accent-hover);
  border-color:var(--accent-hover);
  text-decoration:none;
}

.btn2.ghost{
  background:var(--panel);
  color:var(--accent);
  border:1px solid var(--line);
}
.btn2.ghost:hover{
  background:#fffdfb;
}

.app-links{
  display:flex;
  flex-direction:column;
  gap:8px;
}

.app-links a{
  padding:9px 10px;
  border-radius:6px;
  background:var(--panel);
  border:1px solid var(--line);
}
.app-links a:hover{
  background:#fffdfb;
  text-decoration:none;
}

/* ===== Bloques (centro y derecha) ===== */
.block{
  background:var(--panel);
  border:1px solid var(--line);
  border-radius:8px;      /* menos redondeado */
  padding:12px;
  margin-bottom:12px;
}

.blocktitle{
  font-weight:700;
  margin-bottom:10px;
}

/* ===== Video ===== */
.video{
  position:relative;
  width:100%;
  padding-top:56.25%;
  border-radius:8px;
  overflow:hidden;
  border:1px solid var(--line);
  background:#000;
}
.video iframe{
  position:absolute;
  inset:0;
  width:100%;
  height:100%;
}

/* ===== Listado de artículos ===== */
.latest{
  display:flex;
  flex-direction:column;
  gap:10px;
}

.item{
  background:var(--bg);
  border:1px solid var(--line);
  border-radius:8px;
  padding:10px;
}

.itemt{
  font-weight:700;
  margin-bottom:6px;
}

.itemm{
  color:var(--muted);
  font-size:13px;
}

/* ===== Notas ===== */
.note{
  color:var(--muted);
  font-size:13px;
  margin-top:8px;
}

/* ===== Responsive ===== */
@media (max-width:980px){
  .app-shell{
    grid-template-columns:1fr;
    height:auto;
    padding-top:70px;
  }
  .app-col{
    overflow:visible;
  }
}

/* lineas finales*/
/* =============================
   Tipografía estilo MDPI
   ============================= */

/* Texto base */
body{
  font-size: 14px;
  line-height: 1.6;
  font-weight: 400;
}

/* Títulos principales */
.app-topbar-title{
  font-size: 14px;
  font-weight: 600;
}

.app-h1{
  font-size: 14px;
  font-weight: 600;
  line-height: 1.3;
}

/* Títulos de bloque */
.blocktitle{
  font-size: 14px;
  font-weight: 600;
}

/* Títulos de artículos */
.itemt{
  font-size: 14px;
  font-weight: 600;
  line-height: 1.4;
}

/* Texto secundario */
.itemm,
.note{
  font-size: 12px;
  line-height: 1.5;
}

/* Navegación superior */
.navbtn{
  font-size: 14px;
  font-weight: 400;
}

/* Botones laterales */
.btn2{
  font-size: 12px;
  font-weight: 500;
}

/* Links laterales */
.app-links a{
  font-size: 12px;
  font-weight: 400;
}

/* Evitar títulos exagerados en móvil */
@media (max-width:980px){
  body{
    font-size: 14px;
  }
}

.tabs{
  display:flex;
  flex-wrap:wrap;
  gap:8px;
  margin: 8px 0 12px 0;
}

.tabbtn{
  padding:8px 10px;
  border-radius:6px;
  border:1px solid var(--line);
  background: var(--bg);
  cursor:pointer;
  font-size: 13px;
}

.tabbtn.active{
  background: var(--panel);
  border-color: var(--accent);
}