:root{
  --grad:linear-gradient(135deg,#60a5fa 0%,#34d399 100%);
  --bg:#f8fafc;--card:#fff;--text:#0f172a;--muted:#64748b;--line:#e2e8f0;
  --shadow:0 10px 25px rgba(15,23,42,.08);
  --tile1:#e0f2fe;--tile2:#cffafe;--tile3:#dcfce7;--tile4:#d9f99d;--tile5:#fde68a;
}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--text);font-family:Inter,system-ui,Segoe UI,Roboto,Arial}

/* Header / Nav */
header{position:sticky;top:0;z-index:10;background:var(--grad);color:#fff;box-shadow:0 6px 20px rgba(2,132,199,.25)}
header .bar{position:relative;display:flex;gap:12px;align-items:center;padding:clamp(10px,2.2vw,16px) clamp(12px,3vw,20px)}
.brand{font-weight:800}
header img{height:34px;border-radius:8px}
nav{margin-left:auto;display:flex;gap:8px;flex-wrap:wrap}
nav a,nav button{color:#fff;border:1px solid rgba(255,255,255,.3);padding:8px 10px;border-radius:10px;background:transparent;cursor:pointer;text-decoration:none}
.hamburger{display:none;margin-left:auto;background:transparent;border:1px solid rgba(255,255,255,.6);color:#fff;padding:8px 10px;border-radius:10px;font-size:20px;line-height:1}

/* Layout base */
main{max-width:1200px;margin:18px auto;padding:0 clamp(12px,3vw,20px)}
.card{background:var(--card);border:1px solid var(--line);border-radius:16px;box-shadow:var(--shadow);padding:clamp(14px,3vw,18px);margin-bottom:14px}
h1{margin:0 0 10px;font-size:clamp(20px,5vw,28px)} h2{margin:0 0 8px;font-size:clamp(18px,3.8vw,22px)} h3{margin:0 0 6px}
.small{font-size:13px;color:var(--muted)}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:14px}
.row{display:flex;gap:10px;flex-wrap:wrap}.row>*{flex:1 1 220px}
label{display:block;font-size:12px;color:var(--muted);margin:8px 0 4px}
input,select,textarea{width:100%;padding:12px;border:1px solid #cbd5e1;border-radius:10px;background:#fff;min-height:44px}
textarea{min-height:80px}
.btn{background:#0ea5e9;color:#fff;border:none;border-radius:12px;padding:12px 14px;cursor:pointer;min-height:44px}
.btn.ghost{background:#fff;color:#0f172a;border:1px solid #cbd5e1}
.btn.link{background:#0ea5e9;color:#fff;border:none;border-radius:999px;padding:8px 12px;font-size:13px}
.btn.ghost.active{background:#0ea5e9;color:#fff;border-color:#0ea5e9}
.table-resp{overflow:auto;-webkit-overflow-scrolling:touch;border:1px solid var(--line);border-radius:12px;background:#fff}
table{width:100%;border-collapse:collapse;min-width:680px}
th,td{border-top:1px solid var(--line);padding:10px;text-align:left;font-size:14px}
th{background:#f1f5f9}
.badge{display:inline-block;border-radius:999px;background:#ecfeff;border:1px solid #bae6fd;color:#075985;padding:6px 10px;font-weight:600}
.lead{color:#075985;background:#ecfeff;border:1px solid #bae6fd;padding:12px;border-radius:14px}

/* =========================
   Programación: TILES (ya entregado)
   ========================= */
.tiles{display:grid;gap:14px;grid-template-columns:repeat(3,minmax(0,1fr))}
@media (max-width: 980px){ .tiles{grid-template-columns:repeat(2,minmax(0,1fr))} }
@media (max-width: 680px){ .tiles{grid-template-columns:1fr} }
.tile{
  position:relative;border:1px solid var(--line);border-radius:16px;box-shadow:var(--shadow);
  display:flex;flex-direction:column;min-height:230px;max-height:270px;padding:14px;
  background:linear-gradient(180deg,rgba(255,255,255,.9),rgba(255,255,255,.9)),var(--tile-grad,linear-gradient(135deg,#e0f2fe 0%,#cffafe 100%));
}
.tiles .tile:nth-child(5n+1){ --tile-grad: linear-gradient(135deg,#e0f2fe 0%,#bae6fd 100%); }
.tiles .tile:nth-child(5n+2){ --tile-grad: linear-gradient(135deg,#dcfce7 0%,#bbf7d0 100%); }
.tiles .tile:nth-child(5n+3){ --tile-grad: linear-gradient(135deg,#fef9c3 0%,#fde68a 100%); }
.tiles .tile:nth-child(5n+4){ --tile-grad: linear-gradient(135deg,#ede9fe 0%,#c7d2fe 100%); }
.tiles .tile:nth-child(5n+0){ --tile-grad: linear-gradient(135deg,#ffedd5 0%,#fdba74 100%); }
.tile > .badge{margin-bottom:8px}
.tile > h3{margin:0 0 6px;font-size:16px}
.tile .small{max-height:100px;overflow:auto;padding-right:2px;scrollbar-width:thin}
.tile .row{margin-top:auto;display:flex;align-items:center;justify-content:space-between;gap:10px;flex-wrap:wrap}
.btn.video{padding:6px 10px;min-height:auto;border-radius:999px;font-size:12px;line-height:1.1;background:#0ea5e9}
.btn.video:hover{filter:brightness(1.05)}
.has-video-note{font-size:12px;color:#475569}

/* =========================
   DÍA: tarjetas de ejercicios
   ========================= */
.chips{display:flex;flex-wrap:wrap;gap:8px}
.chips .chip{background:#f1f5f9;border:1px solid #e2e8f0;border-radius:999px;padding:6px 10px;font-size:12px;color:#475569}

.ex-grid{display:grid;gap:14px;grid-template-columns:repeat(2,minmax(0,1fr))}
@media (max-width: 860px){ .ex-grid{grid-template-columns:1fr} }

.ex-card{
  background:#fff;border:1px solid #e2e8f0;border-radius:16px;padding:14px;box-shadow:var(--shadow);
  display:grid;gap:10px
}
.ex-head{display:flex;align-items:center;justify-content:space-between;gap:10px;flex-wrap:wrap}
.ex-title{font-weight:800}
.ex-meta{font-size:12px;color:#64748b}
.ex-meta b{color:#0f172a}
.field label{display:block;font-size:12px;color:#64748b;margin:4px 0 4px}
.field input{width:100%;padding:10px;border:1px solid #cbd5e1;border-radius:10px;background:#fff;min-height:40px;font-size:14px}
.footer-actions{display:flex;gap:10px;justify-content:flex-end;flex-wrap:wrap;margin-top:10px}

/* =========================
   MODAL (Popup) — estable
   ========================= */
.modal{position:fixed; inset:0; display:none; align-items:center; justify-content:center; padding:16px; background:rgba(2,6,23,.55); z-index:1000}
.modal .box{background:#fff;color:#0f172a;border-radius:16px;box-shadow:0 20px 60px rgba(15,23,42,.35);width:min(860px,96vw);max-height:90vh;display:flex;flex-direction:column;padding:0}
.m-head{display:flex; gap:10px; align-items:center; justify-content:space-between; flex-wrap:wrap; padding:14px 16px; border-bottom:1px solid #e2e8f0}
.m-title{margin:0;font-size:18px;font-weight:800}
.m-meta{padding:10px 16px; font-size:13px; color:#64748b}
.m-recs{padding:0 16px 6px 36px; margin:0; list-style:disc; color:#334155}
.m-sep{height:1px;background:#e2e8f0; margin:6px 0}
.m-scroll{padding:10px 16px 0 16px; overflow:auto; flex:1 1 auto;}
.m-list{display:grid; gap:10px}
.m-item{border:1px solid #e2e8f0; border-radius:12px; background:#fff; padding:10px; display:grid; gap:6px}
.m-actions{padding:12px 16px; border-top:1px solid #e2e8f0; display:flex; gap:10px; justify-content:flex-end; flex-wrap:wrap}

/* Responsive nav */
@media (max-width:768px){
  nav{display:none;flex-direction:column;gap:6px;background:#0ea5e9;backdrop-filter:saturate(1.2) blur(2px);position:absolute;right:12px;top:56px;padding:8px;border-radius:12px}
  nav.open{display:flex}
  table{min-width:560px}
}
/* Hamburguesa */
.hamb{
  display:none;width:40px;height:40px;margin-left:auto;
  border-radius:12px;border:1px solid rgba(255,255,255,.45);
  background:rgba(255,255,255,.12);
  backdrop-filter:saturate(120%) blur(2px);
  cursor:pointer; position:relative;
}
.hamb span{display:block; height:2px; width:22px; left:50%; transform:translateX(-50%); background:#fff; position:absolute; transition:.18s ease; border-radius:2px;}
.hamb span:nth-child(1){ top:12px; }
.hamb span:nth-child(2){ top:19px; }
.hamb span:nth-child(3){ top:26px; }
.hamb.active span:nth-child(1){ transform:translateX(-50%) rotate(45deg); top:19px; width:22px; }
.hamb.active span:nth-child(2){ opacity:0; }
.hamb.active span:nth-child(3){ transform:translateX(-50%) rotate(-45deg); top:19px; width:22px; }

/* Panel móvil del nav */
@media (max-width: 860px){
  .hamb{ display:block; }
  .site-header .bar{ gap:10px; }
  .site-header nav{
    position:fixed; right:12px; top:58px; z-index:1000;
    background:#ffffff; color:#0f172a;
    border:1px solid #e2e8f0; border-radius:14px;
    box-shadow:0 18px 50px rgba(15,23,42,.25);
    min-width:220px; padding:10px; display:none;
  }
  .site-header nav.open{ display:block; }
  .site-header nav a, .site-header nav button{
    display:block; width:100%; text-align:left;
    color:#0f172a; background:#fff;
    border:1px solid #e2e8f0; border-radius:10px;
    padding:10px 12px; margin:6px 0;
  }
}

/* Desktop nav */
@media (min-width: 861px){
  .site-header nav{ display:flex !important; gap:8px; margin-left:auto; background:transparent; border:0; box-shadow:none; position:static; padding:0; }
  .site-header nav a, .site-header nav button{ color:#fff; border-color:rgba(255,255,255,.3); background:transparent; }
}