:root{
    --bg:#f5f7f9; --surface:#ffffff; --ink:#24303c; --muted:#7a8595;
    --border:#e6ebf0; --accent:#1f8a70; --accent-dark:#17705a; --danger:#b4433a;
    --radius:14px; --shadow:0 1px 2px rgba(20,30,45,.04),0 6px 20px rgba(20,30,45,.05);
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
    margin:0; background:var(--bg); color:var(--ink);
    font:16px/1.55 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
    font-feature-settings:"tnum" 1;
}
a{color:var(--accent-dark);text-decoration:none}
a:hover{text-decoration:underline}
.wrap{max-width:960px;margin:0 auto;padding:0 1.1rem}
.narrow{max-width:460px}
h1{font-size:1.7rem;letter-spacing:-.02em;margin:1.4rem 0 1rem}
h2{font-size:1.3rem;letter-spacing:-.01em;margin:.2rem 0 .6rem}
h3{font-size:.95rem;text-transform:uppercase;letter-spacing:.06em;color:var(--muted);margin:0 0 .7rem;font-weight:600}
.muted{color:var(--muted)}
footer.wrap{padding:2rem 1.1rem;color:var(--muted);font-size:.85rem}

/* Topbar */
.topbar{background:var(--surface);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:10}
.topbar .wrap{display:flex;align-items:center;gap:1rem;height:56px}
.brand{font-weight:700;letter-spacing:-.02em;color:var(--ink)}
.topbar nav{display:flex;gap:.15rem;flex:1;overflow-x:auto;scrollbar-width:none}
.topbar nav::-webkit-scrollbar{display:none}
.topbar nav a{padding:.35rem .6rem;border-radius:8px;color:var(--muted);font-size:.92rem;white-space:nowrap}
.topbar nav a:hover{background:var(--bg);text-decoration:none;color:var(--ink)}
.topbar nav a.active{color:var(--accent-dark);background:#eaf5f1}
.topbar .user{display:flex;gap:.7rem;align-items:center;font-size:.9rem;white-space:nowrap}

/* Hero / countdown */
.hero{margin:1.6rem 0 1rem;display:flex;align-items:baseline;gap:1.2rem;flex-wrap:wrap}
.hero-count{display:flex;align-items:baseline;gap:.6rem}
.big-number{font-size:4.2rem;font-weight:800;line-height:.9;letter-spacing:-.04em;color:var(--accent)}
.hero-label{color:var(--muted);font-size:1rem;max-width:6rem}
.hero-hello{color:var(--ink);font-size:1.05rem;margin:0}

/* Cards + grid */
.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);
    box-shadow:var(--shadow);padding:1.1rem;margin:0 0 1.1rem}
.grid{display:grid;gap:1.1rem;grid-template-columns:repeat(3,1fr);margin-bottom:.2rem}
.grid.two{grid-template-columns:repeat(2,1fr)}
.stat .stat-value{font-size:1.8rem;font-weight:700;letter-spacing:-.02em}
.stat .stat-value .muted{font-size:1rem;font-weight:400}

/* Progress bar */
.bar{height:7px;background:var(--bg);border-radius:99px;overflow:hidden;margin:.5rem 0}
.bar span{display:block;height:100%;background:var(--accent);border-radius:99px}

/* Lists */
.list{list-style:none;margin:0;padding:0}
.list li{padding:.35rem 0;border-bottom:1px solid var(--border)}
.list li:last-child{border-bottom:0}

/* Checklist */
.checklist{list-style:none;margin:0;padding:0}
.checklist li{display:flex;align-items:center;gap:.8rem;padding:.55rem 0;border-bottom:1px solid var(--border)}
.checklist li:last-child{border-bottom:0}
.checklist li.inactive{opacity:.5}
.checklist .grow{flex:1}
.checklist strong{display:block;font-weight:600}
.checklist .muted{font-size:.85rem}
.checklist .actions{display:flex;gap:.6rem}
.check{width:30px;height:30px;border-radius:50%;border:2px solid var(--border);background:var(--surface);
    color:#fff;font-size:.9rem;cursor:pointer;display:flex;align-items:center;justify-content:center;padding:0;flex:0 0 auto}
.check.on{background:var(--accent);border-color:var(--accent)}
.check.ghost{cursor:default}

/* Tables */
.table{width:100%;border-collapse:collapse;font-size:.94rem}
.table th{text-align:left;color:var(--muted);font-weight:600;font-size:.8rem;
    text-transform:uppercase;letter-spacing:.05em;padding:.4rem .5rem;border-bottom:1px solid var(--border)}
.table td{padding:.5rem;border-bottom:1px solid var(--border)}
.table tr:last-child td{border-bottom:0}

/* Forms */
label{display:block;margin:0 0 .7rem;font-size:.9rem;color:var(--muted)}
input,select,textarea{width:100%;margin-top:.25rem;padding:.55rem .65rem;font:inherit;color:var(--ink);
    background:var(--surface);border:1px solid var(--border);border-radius:9px}
input:focus,select,textarea:focus{outline:2px solid var(--accent);outline-offset:1px;border-color:var(--accent)}
.row{display:grid;grid-template-columns:1fr 1fr;gap:.8rem}
.check-label{display:flex;align-items:center;gap:.5rem}
.check-label input{width:auto;margin:0}
.inline-form{display:flex;flex-wrap:wrap;gap:.5rem;align-items:flex-end;margin-top:.6rem}
.inline-form input,.inline-form select{width:auto;flex:1;min-width:110px;margin-top:0}
.inline-form label{margin:0}

/* Buttons */
.btn{display:inline-block;background:var(--accent);color:#fff;border:0;border-radius:9px;
    padding:.6rem 1.1rem;font:inherit;font-weight:600;cursor:pointer}
.btn:hover{background:var(--accent-dark);text-decoration:none}
.btn.small{padding:.45rem .8rem;font-size:.9rem}
.link{background:none;border:0;color:var(--accent-dark);cursor:pointer;font:inherit;padding:0;text-decoration:none}
.link:hover{text-decoration:underline}
.link.danger{color:var(--danger)}
button.link{display:inline}

/* Video */
.video{position:relative;padding-top:56.25%;border-radius:12px;overflow:hidden;margin:.6rem 0;background:#000}
.video iframe{position:absolute;inset:0;width:100%;height:100%;border:0}

/* Photos */
.gallery{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:.8rem}
.gallery figure{margin:0;background:var(--bg);border-radius:10px;overflow:hidden;border:1px solid var(--border)}
.gallery img{width:100%;aspect-ratio:3/4;object-fit:cover;display:block}
.gallery figcaption{display:flex;justify-content:space-between;align-items:center;gap:.4rem;
    padding:.4rem .55rem;font-size:.78rem;color:var(--muted)}
.compare{display:grid;grid-template-columns:1fr 1fr;gap:.8rem;margin-top:.9rem}
.compare figure{margin:0}
.compare img{width:100%;border-radius:10px;border:1px solid var(--border)}
.compare figcaption{font-size:.82rem;color:var(--muted);margin-top:.3rem;text-align:center}

/* Details */
details.card summary{cursor:pointer;font-weight:600;list-style:none}
details.card summary::-webkit-details-marker{display:none}
details.card summary::before{content:"＋ ";color:var(--accent)}
details.card[open] summary::before{content:"− "}
details.card[open] summary{margin-bottom:.9rem}

/* Flash */
.flash{background:#eaf5f1;color:var(--accent-dark);border:1px solid #cfe9e0;
    padding:.6rem .9rem;border-radius:10px;margin:1rem 0}
.flash.error{background:#fbecea;color:var(--danger);border-color:#f2cec9}

/* Auth */
.auth-body{display:flex;min-height:100vh;align-items:center}
.auth-card{width:100%}
.brand-big{text-align:center;font-size:1.8rem;letter-spacing:-.02em;margin-bottom:1rem}

@media (max-width:640px){
    .grid,.grid.two{grid-template-columns:1fr}
    .row{grid-template-columns:1fr}
    .compare{grid-template-columns:1fr}
    .big-number{font-size:3.4rem}
    h1{font-size:1.45rem}
}
@media (prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}}

/* Exercise library grid */
.ex-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:.8rem;margin-top:.8rem}
.ex-card{display:flex;flex-direction:column;background:var(--bg);border:1px solid var(--border);
    border-radius:12px;overflow:hidden;color:var(--ink)}
.ex-card:hover{text-decoration:none;border-color:var(--accent);box-shadow:var(--shadow)}
.ex-thumb-wrap{aspect-ratio:1/1;background:#fff;display:flex;align-items:center;justify-content:center;overflow:hidden}
.ex-thumb{width:100%;height:100%;object-fit:cover}
.ex-noimg{font-size:1.8rem;opacity:.4}
.ex-name{padding:.5rem .6rem 0;font-weight:600;font-size:.9rem;line-height:1.25}
.ex-meta{padding:0 .6rem .6rem;font-size:.76rem}
.ex-media{width:100%;max-width:420px;border-radius:12px;border:1px solid var(--border);margin:.6rem 0;background:#fff}

/* Suplementos: nombre de producto y edición inline */
.checklist li{flex-wrap:wrap}
.supp-product{color:var(--accent-dark);font-weight:600}
.supp-edit{flex-basis:100%;margin-top:.5rem}
.supp-edit>summary{font-size:.82rem;color:var(--muted);cursor:pointer;list-style:none}
.supp-edit>summary::-webkit-details-marker{display:none}
.supp-edit>summary::before{content:"✎ ";}
.supp-edit[open]{padding:.6rem .8rem;background:var(--bg);border:1px solid var(--border);border-radius:10px}
.supp-edit form{margin-top:.6rem}

/* Entrenos: celdas editables de series */
.table input.cell{width:5.2rem;margin:0;padding:.35rem .45rem;text-align:center}
.set-actions{display:flex;gap:.6rem;white-space:nowrap}
.set-actions form{display:inline}

/* Ayuno */
.fast-clock{font-size:2.6rem;font-weight:700;letter-spacing:.02em;margin:.4rem 0;font-variant-numeric:tabular-nums}
.fast-stage{font-size:1.1rem;font-weight:600}
.fast-next{margin-top:.3rem}
.fast-timeline{list-style:none;margin:.4rem 0 0;padding:0}
.fast-timeline li{display:flex;gap:.7rem;padding:.5rem 0;border-bottom:1px solid var(--border);opacity:.55}
.fast-timeline li:last-child{border-bottom:0}
.fast-timeline li.done{opacity:1}
.fast-timeline li.done .fast-h{background:var(--accent);color:#fff;border-color:var(--accent)}
.fast-h{flex:0 0 auto;min-width:2.4rem;height:2.4rem;display:flex;align-items:center;justify-content:center;
    border:2px solid var(--border);border-radius:50%;font-size:.8rem;font-weight:600}
.fast-t{display:flex;flex-direction:column}
.fast-t .muted{font-size:.85rem}

/* Líquidos */
.quick-drinks{display:flex;flex-wrap:wrap;gap:.5rem}
.quick-drinks form{display:inline}

/* Cabecera de tarjeta con acción */
.card-head{display:flex;align-items:center;justify-content:space-between;gap:.8rem;flex-wrap:wrap}
.card-head h3{margin:0}

/* Entreno guiado (overlay) */
.guide-overlay{position:fixed;inset:0;background:rgba(20,26,33,.6);z-index:50;display:flex;
    align-items:flex-end;justify-content:center;padding:0}
.guide-box{background:var(--surface);width:100%;max-width:560px;max-height:92vh;overflow:auto;
    border-radius:16px 16px 0 0;padding:1rem 1.1rem 1.4rem;box-shadow:0 -8px 40px rgba(0,0,0,.25)}
@media(min-width:600px){ .guide-overlay{align-items:center} .guide-box{border-radius:16px} }
.guide-top{display:flex;justify-content:space-between;align-items:center;margin-bottom:.4rem}
.guide-box h2{margin:.2rem 0 .6rem}
.guide-media{position:relative;padding-top:56.25%;border-radius:12px;overflow:hidden;margin:.4rem 0;background:#000}
.guide-media iframe{position:absolute;inset:0;width:100%;height:100%;border:0}
.guide-media-img{width:100%;max-height:300px;object-fit:contain;background:#fff;border-radius:12px;border:1px solid var(--border)}
.guide-sets{margin-top:.6rem;display:flex;flex-direction:column;gap:.5rem}
.guide-set{display:flex;align-items:center;gap:.5rem;padding:.4rem .5rem;border:1px solid var(--border);border-radius:10px}
.guide-set.done{background:var(--bg);border-color:var(--accent)}
.guide-set-n{flex:1;font-weight:600;font-size:.9rem}
.guide-set input.cell{width:4.6rem}
.guide-rest{margin-top:.8rem;padding:.6rem .8rem;background:var(--bg);border-radius:10px;
    display:flex;justify-content:space-between;align-items:center;gap:.6rem}
.guide-rest-label{font-weight:600;font-variant-numeric:tabular-nums}
.guide-rest-actions{display:flex;gap:.5rem}
.guide-nav{display:flex;justify-content:space-between;gap:.6rem;margin-top:1rem}
.guide-nav .btn{flex:1}