:root{
  --azul-oscuro:#0C314E;
  --azul:#11678B;
  --naranja:#F15D0A;
  --dorado:#DFC174;
  --gris:#222123;
  --fondo:#FFFFFF;
  --suave:#F5F1D5;

  --radio:16px;
  --shadow: 0 10px 30px rgba(12,49,78,.12);
  --max: 1100px;
  --gap: 18px;
  --borde: 1px solid rgba(12,49,78,.12);
  --fuente: system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
}

*{ box-sizing:border-box; }
html,body{ margin:0; padding:0; font-family:var(--fuente); color:var(--gris); background:var(--fondo); }
body{ overflow-x:hidden; }
a{ color:inherit; text-decoration:none; }
img{ max-width:100%; display:block; }

.container{ max-width:var(--max); margin:0 auto; padding:0 16px; }

/* Header estilo “Moodle limpio” */
.header{
  position:sticky; top:0; z-index:50;
  background:rgba(255,255,255,.92);
  backdrop-filter: blur(8px);
  border-bottom: var(--borde);
}
.header__bar{
  display:flex; align-items:center; justify-content:space-between;
  gap:12px; padding:12px 0;
  flex-wrap:nowrap;
}
.brand{
  display:flex; align-items:center; gap:10px;
  font-weight:800; color:var(--azul-oscuro);
  flex:0 0 auto;
  min-width:0;
}
.brand__badge{
  width:34px; height:34px; border-radius:10px;
  background: linear-gradient(135deg, var(--azul), var(--naranja));
  box-shadow: var(--shadow);
}
.brand__logo{
  width:auto;
  height:auto;
  max-height:70px;
  object-fit:contain;
}
.brand__logo--original{
  max-height:none;
}
.nav{
  display:flex; gap:10px; flex-wrap:wrap; justify-content:flex-end;
  flex: 1 1 auto;
  flex-wrap:nowrap;
}
.nav a{
  padding:10px 12px;
  border-radius:999px;
  border: 1px solid rgba(255,255,255,.35);
  background: var(--azul);
  color:#fff;
  font-weight:650;
  white-space:nowrap;
  transition:.15s ease;
}
.nav a:hover,
.nav a:focus-visible,
.nav a:active{
  background: var(--naranja);
  color:#fff;
  transform: translateY(-1px);
  box-shadow: var(--shadow);
}
.nav a.active{
  border-color: rgba(255,255,255,.45);
  color:#fff;
  background: var(--naranja);
}

/* Hero */
.hero{
  padding:26px 0 10px;
}
.hero--full{
  margin-left: calc(50% - 50vw);
  margin-right: calc(50% - 50vw);
}
.hero__grid{
  display:grid;
  grid-template-columns: 1.2fr .8fr;
  gap: var(--gap);
  align-items:stretch;
}
@media (max-width: 900px){
  .hero__grid{ grid-template-columns:1fr; }
}
.card{
  background:#fff;
  border: var(--borde);
  border-radius: var(--radio);
  box-shadow: var(--shadow);
  overflow:hidden;
}
.card__pad{ padding:18px; }

.h1{ font-size: clamp(22px, 2.5vw, 34px); margin:0 0 8px; color:var(--azul-oscuro); }
.p{ margin:0 0 14px; line-height:1.5; color: rgba(34,33,35,.9); }

.badges{ display:flex; flex-wrap:wrap; gap:8px; margin-top:10px; }
.badge{
  display:inline-flex; align-items:center; gap:8px;
  padding:8px 10px; border-radius:999px;
  background: rgba(223,193,116,.25);
  border: 1px solid rgba(223,193,116,.45);
  font-weight:700;
}
.badge i{
  width:10px; height:10px; border-radius:50%;
  background: var(--naranja);
}

/* Botones */
.btns{ display:flex; flex-wrap:wrap; gap:10px; margin-top:10px; }
.btn{
  display:inline-flex; align-items:center; justify-content:center;
  padding:12px 14px; border-radius:12px;
  font-weight:800; border:0; cursor:pointer;
  transition:.15s ease;
  background: var(--azul);
  color:#fff;
  text-align:center;
}
.btn.primary{ background: var(--azul); color:#fff; }
.btn.accent{ background: var(--azul); color:#fff; }
.btn.ghost{
  background: var(--azul);
  border:1px solid rgba(255,255,255,.35);
  color:#fff;
}
.btn:hover,
.btn:focus-visible,
.btn:active{
  background: var(--naranja);
  transform: translateY(-1px);
  box-shadow: var(--shadow);
}

/* Carrusel */
.carousel{
  position:relative; height: 420px;
  background: #fff;
}
.carousel img{
  width:100%;
  height:100%;
  object-fit:contain;
  object-position:center;
  background:#fff;
}
.carousel__controls{
  position:absolute; inset:auto 12px 12px 12px;
  display:flex; justify-content:space-between; align-items:center;
}
.dots{ display:flex; gap:8px; }
.dot{
  width:10px; height:10px; border-radius:999px;
  background: rgba(255,255,255,.6);
  border:1px solid rgba(12,49,78,.18);
  cursor:pointer;
}
.dot.active{ background: var(--azul); }

.iconbtn{
  width:42px; height:42px; border-radius:12px;
  border:1px solid rgba(12,49,78,.14);
  background: rgba(255,255,255,.85);
  cursor:pointer;
}

/* Secciones */
.section{ padding:16px 0 28px; }
.home-columns{
  display:grid;
  grid-template-columns: 2fr 1fr;
  gap: var(--gap);
  align-items:start;
  padding: 16px 0 28px;
}
.card__pad--poster{
  display:flex;
  justify-content:center;
  align-items:center;
  padding:16px;
}
.poster-img{
  width:85%;
  max-width:680px;
  height:auto;
}
.section--quick{
  padding:0;
}
.quick-column{
  display:flex;
  flex-direction:column;
  gap: var(--gap);
}
.quick-column .tile{
  color:#fff;
  border:0;
  cursor:pointer;
  transition:.15s ease;
}
.tile-link{
  display:block;
}
.quick-column .tile h3,
.quick-column .tile p{
  color:#fff;
}
.quick-column .tile:nth-child(odd){
  background: var(--azul);
}
.quick-column .tile:nth-child(even){
  background: var(--naranja);
}
.quick-column .tile:hover,
.quick-column .tile:active{
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}
.section__title{
  margin:0 0 12px; color:var(--azul-oscuro);
  font-size: 18px; letter-spacing:.2px;
}
.grid{
  display:grid; gap: var(--gap);
  grid-template-columns: repeat(3, 1fr);
}
@media (max-width: 900px){ .grid{ grid-template-columns:1fr; } }
@media (max-width: 900px){
  .hero--full{
    margin-left: 0;
    margin-right: 0;
  }
  .carousel{
    height:300px;
  }
  .home-columns{
    grid-template-columns:1fr;
  }
  .poster-img{
    width:100%;
    max-width:520px;
  }
}

.tile{
  border-radius: var(--radio);
  border: var(--borde);
  background:#fff;
  padding:16px;
}
.tile h3{ margin:0 0 8px; color:var(--azul-oscuro); }
.tile p{ margin:0; line-height:1.5; }

.p--small{
  font-size: 14px;
  opacity: .85;
}

/* Clasificación */
.ranking-layout{
  display:grid;
  gap: var(--gap);
}
.ranking-card .section__title{
  margin-bottom:14px;
}
.table-wrap{
  width:100%;
  overflow-x:auto;
  -webkit-overflow-scrolling: touch;
  border: var(--borde);
  border-radius:12px;
}
.ranking-table{
  width:100%;
  border-collapse: collapse;
  min-width: 700px;
  background:#fff;
}
.ranking-table thead th{
  background: var(--azul);
  color:#fff;
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: .3px;
}
.ranking-table th,
.ranking-table td{
  padding:10px 12px;
  text-align:center;
  border-bottom: 1px solid rgba(12,49,78,.10);
}
.ranking-table .name-cell{
  text-align:left;
  font-weight:700;
  color: var(--azul-oscuro);
}
.ranking-table .pts-cell{
  font-weight:800;
}
.ranking-table tbody tr:nth-child(even){
  background: rgba(17,103,139,.05);
}
.ranking-table tbody tr:hover{
  background: rgba(241,93,10,.08);
}

/* Jornadas */
.jornadas-tools{
  margin-bottom: var(--gap);
}
.jornada-form{
  display:grid;
  gap:10px;
}
.jornada-form input,
.jornada-form textarea{
  width:100%;
  border:1px solid rgba(12,49,78,.2);
  border-radius:10px;
  padding:10px 12px;
  font:inherit;
}
.jornada-form textarea{
  resize:vertical;
  min-height:88px;
}
.jornadas-list{
  display:grid;
  gap: var(--gap);
}
.jornada-post{
  overflow:visible;
}
.jornada-post__img{
  width:100%;
  height:260px;
  object-fit:cover;
  background:#fff;
}
.jornada-post__meta{
  margin:6px 0 8px;
  font-size: 13px;
  color: rgba(34,33,35,.75);
  text-transform: capitalize;
}
.jornada-post__title{
  margin:0 0 8px;
  color: var(--azul-oscuro);
}
.jornada-post__text{
  margin:0;
  line-height:1.5;
}
.jornada-post__pairings{
  margin-top:14px;
  min-width:0;
}
.jornada-note{
  margin-bottom:10px;
}
.jornada-groups{
  display:grid;
  grid-template-columns: 1fr;
  gap: var(--gap);
  min-width:0;
}
.jornada-group-card{
  min-width:0;
}
.jornada-group-card h4{
  margin:0 0 8px;
  color: var(--azul-oscuro);
}
.frontend-jornadas .jornada-group-card .jornada-table-wrap{
  width:100%;
  max-width:100%;
  display:block;
  overflow-x:auto;
  overflow-y:hidden;
  -webkit-overflow-scrolling: touch;
  scrollbar-gutter: stable both-edges;
  scrollbar-width: thin;
  scrollbar-color: var(--azul) rgba(12,49,78,.12);
}
.frontend-jornadas .jornada-group-card .jornada-table-wrap::-webkit-scrollbar{
  height:10px;
}
.frontend-jornadas .jornada-group-card .jornada-table-wrap::-webkit-scrollbar-thumb{
  background: var(--azul);
  border-radius:999px;
}
.frontend-jornadas .jornada-group-card .jornada-table-wrap::-webkit-scrollbar-track{
  background: rgba(12,49,78,.12);
}
.frontend-jornadas .jornada-group-card .ranking-table{
  width:100%;
  min-width: 900px;
}
.frontend-jornadas .jornada-group-card .ranking-table th,
.frontend-jornadas .jornada-group-card .ranking-table td{
  white-space: nowrap;
}
.jornada-group-card .ranking-table td:nth-child(2),
.jornada-group-card .ranking-table td:nth-child(3){
  text-align:left;
}
.frontend-jornadas .jornadas-list .jornada-post__title{
  display:block;
  width:100%;
  padding:8px 12px;
  border-radius:10px;
  color:#fff;
}
.frontend-jornadas .jornadas-list .jornada-post:nth-child(odd) .jornada-post__title{
  background: var(--azul);
}
.frontend-jornadas .jornadas-list .jornada-post:nth-child(even) .jornada-post__title{
  background: var(--naranja);
}

/* Retos */
.help-banner{
  margin-bottom: var(--gap);
  border-left: 6px solid var(--naranja);
}
.retos-filters{
  margin-bottom: var(--gap);
}
.retos-controls{
  display:grid;
  grid-template-columns: auto 1fr auto 1fr;
  gap:10px 12px;
  align-items:center;
}
.retos-label{
  font-weight:700;
  color: var(--azul-oscuro);
}
.retos-controls select{
  width:100%;
  border:1px solid rgba(12,49,78,.2);
  border-radius:10px;
  padding:10px 12px;
  font:inherit;
  background:#fff;
}
.retos-list{
  display:grid;
  gap: var(--gap);
  grid-template-columns: repeat(2, 1fr);
}
.reto-card{
  height:100%;
}
.reto-meta{
  margin:0 0 8px;
  font-size:13px;
  color: rgba(34,33,35,.75);
}
.reto-title{
  margin:0 0 8px;
  color: var(--azul-oscuro);
}
.reto-desc{
  margin:0 0 14px;
  line-height:1.5;
}
.reto-link{
  width:100%;
}
@media (max-width: 900px){
  .retos-controls{
    grid-template-columns: 1fr;
  }
  .retos-list{
    grid-template-columns:1fr;
  }
}

/* Tablero retos */
.tablero-head{
  margin-bottom: var(--gap);
}
.tablero-layout{
  display:grid;
  grid-template-columns: 2fr 1fr;
  gap: var(--gap);
  align-items:start;
}
.chessboard{
  width:100%;
  max-width:560px;
  aspect-ratio: 1 / 1;
  margin:0 auto;
  border: 8px solid var(--azul-oscuro);
  border-radius: 10px;
  overflow:hidden;
  display:grid;
  grid-template-columns: repeat(8, 1fr);
}
.square{
  position:relative;
  display:flex;
  align-items:center;
  justify-content:center;
  user-select:none;
}
.square.light{
  background:#f0d9b5;
}
.square.dark{
  background:#b58863;
}
.piece{
  font-size: clamp(24px, 3.8vw, 44px);
  line-height:1;
}
.square[data-file]::after{
  content: attr(data-file);
  position:absolute;
  right:6px;
  bottom:4px;
  font-size:12px;
  font-weight:700;
  opacity:.85;
}
.square[data-rank]::before{
  content: attr(data-rank);
  position:absolute;
  left:6px;
  top:4px;
  font-size:12px;
  font-weight:700;
  opacity:.85;
}
.square.light[data-file]::after,
.square.light[data-rank]::before{
  color:#8b5a2b;
}
.square.dark[data-file]::after,
.square.dark[data-rank]::before{
  color:#f5e6cf;
}
.moves-input{
  width:100%;
  border:1px solid rgba(12,49,78,.2);
  border-radius:10px;
  padding:10px 12px;
  font:inherit;
  resize:vertical;
  min-height:120px;
}
#move-feedback.ok{
  color:#0b7a3b;
  font-weight:700;
}
#move-feedback.ko{
  color:#b23820;
  font-weight:700;
}
@media (max-width: 900px){
  .tablero-layout{
    grid-template-columns:1fr;
  }
}

/* Ayuda movimientos */
.ayuda-banner{
  margin-bottom: var(--gap);
  border-left: 6px solid var(--azul);
}
.ayuda-grid{
  display:grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--gap);
  margin-bottom: var(--gap);
}
.ayuda-list{
  margin:0;
  padding-left:20px;
  line-height:1.6;
}
.ayuda-table-wrap{
  margin-bottom: var(--gap);
}
.ayuda-table td:first-child{
  text-align:left;
}
@media (max-width: 900px){
  .ayuda-grid{
    grid-template-columns:1fr;
  }
}

/* Contacto */
.contacto-wrap{
  max-width:none;
  width:100%;
}
.contacto-list{
  display:grid;
  gap:12px;
}
.contacto-item{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
  border: var(--borde);
  border-radius:12px;
  padding:14px;
  background:#fff;
}
.contacto-name{
  margin:0 0 4px;
  color: var(--azul-oscuro);
}
.contacto-mail{
  margin:0;
  color: rgba(34,33,35,.8);
  overflow-wrap:anywhere;
}
@media (max-width: 1100px){
  .nav a{
    padding:8px 10px;
    font-size:14px;
  }
}
@media (max-width: 700px){
  .contacto-item{
    flex-direction:column;
    align-items:flex-start;
  }
}
@media (max-width: 760px){
  .header{
    position:static;
  }
  .header__bar{
    flex-wrap:wrap;
    justify-content:center;
  }
  .brand{
    flex:1 1 auto;
    min-width:220px;
    justify-content:center;
    text-align:center;
  }
  .nav{
    flex-wrap:wrap;
    justify-content:center;
    width:100%;
  }
}
@media (max-width: 600px){
  .container{
    padding:0 12px;
  }
  .h1{
    font-size: clamp(20px, 6vw, 28px);
  }
  .nav{
    gap:8px;
  }
  .nav a{
    font-size:13px;
    padding:8px 10px;
  }
  input,
  select,
  textarea,
  button{
    font-size:16px;
  }
}

/* Footer */
.footer{
  border-top: var(--borde);
  padding:18px 0; color: rgba(34,33,35,.75);
}
.footer__inner{
  display:flex;
  align-items:center;
  justify-content:center;
  gap:10px;
  flex-wrap:wrap;
  text-align:center;
}
.footer__logo-link{
  display:inline-flex;
}
.footer__logo{
  width:auto;
  height:auto;
  max-height:36px;
  object-fit:contain;
}
.small{ font-size: 13px; }

/* BackChess */
.back-home{
  min-height: 55vh;
  display:flex;
  align-items:center;
  justify-content:center;
}
.back-home__logo{
  width:auto;
  height:200px;
  max-width:100%;
}

.back-round-head{
  margin-bottom: var(--gap);
}
.back-jornada-actions{
  margin: 6px 0 10px;
}
.back-tabs{
  display:flex;
  flex-wrap:wrap;
  gap:8px;
  margin-bottom:10px;
}
.tab-btn{
  border:1px solid rgba(12,49,78,.18);
  background:#fff;
  color: var(--azul-oscuro);
  border-radius:999px;
  padding:8px 12px;
  font-weight:700;
  cursor:pointer;
}
.tab-btn.active{
  background: var(--naranja);
  color:#fff;
  border-color: transparent;
}
.back-groups-layout{
  display:grid;
  grid-template-columns: 1fr;
  gap: var(--gap);
  margin-top:12px;
}
.back-group-panel{
  border: var(--borde);
  border-radius: 12px;
  padding: 14px;
  background:#fff;
}
.back-matches-table td{
  vertical-align:middle;
}
.back-radio{
  display:inline-flex;
  align-items:center;
  gap:4px;
  margin-right:10px;
  font-size:13px;
}
.back-bye{
  display:inline-block;
  padding:4px 8px;
  border-radius:999px;
  background: rgba(17,103,139,.12);
  color: var(--azul-oscuro);
  font-weight:700;
}
.back-retos-panel{
  margin-bottom: var(--gap);
}
.back-retos-table td{
  vertical-align:middle;
}
.back-contacto-panel{
  margin-bottom: var(--gap);
}
.back-contacto-table td{
  vertical-align:middle;
}
.back-input{
  width:100%;
  border:1px solid rgba(12,49,78,.2);
  border-radius:8px;
  padding:8px 10px;
  font:inherit;
}
.back-inline-btn{
  border:1px solid rgba(12,49,78,.18);
  background:#fff;
  color:var(--azul-oscuro);
  border-radius:8px;
  padding:6px 10px;
  font:inherit;
  cursor:pointer;
}
.back-inline-btn:hover,
.back-inline-btn:focus-visible{
  background: var(--naranja);
  color:#fff;
  border-color: transparent;
}
.back-save-msg.ok{
  color:#0b7a3b;
  font-weight:700;
}
.back-save-msg.ko{
  color:#b23820;
  font-weight:700;
}