:root{--bg:#ecebe7;--ink:#26272b;--mut:#6b6d74;--card:rgba(255,255,255,.65);--bd:rgba(30,30,40,.12);--ac:#4f6672;--ac2:#8a7355;--warn:#a8603d;--on:#fff;--r:20px;--sh:0 10px 40px -14px rgba(20,20,30,.25);color-scheme:light}
[data-theme=dark]{--bg:#121315;--ink:#e4e4e7;--mut:#9a9ca3;--card:rgba(32,33,37,.72);--bd:rgba(255,255,255,.09);--ac:#8fa3ad;--ac2:#c2a98b;--warn:#c98b6b;--on:#121315;--sh:0 10px 40px -14px #000;color-scheme:dark}
*{box-sizing:border-box;margin:0}html{scroll-behavior:smooth;scroll-padding-top:90px}
body{font-family:Inter,system-ui,-apple-system,"Segoe UI",sans-serif;background:var(--bg);color:var(--ink);line-height:1.7;overflow-x:hidden}
body::before{content:"";position:fixed;inset:0;z-index:-1;background:radial-gradient(60vmax 40vmax at 10% -10%,color-mix(in srgb,var(--ac) 16%,transparent),transparent),radial-gradient(50vmax 40vmax at 100% 10%,color-mix(in srgb,var(--ac2) 11%,transparent),transparent)}
#bar{position:fixed;top:0;left:0;height:3px;width:0;background:linear-gradient(90deg,var(--ac),var(--ac2));z-index:99}
header.top{position:sticky;top:0;z-index:50;display:flex;gap:1rem;align-items:center;justify-content:space-between;padding:.7rem clamp(1rem,4vw,3rem);backdrop-filter:blur(16px) saturate(1.4);background:color-mix(in srgb,var(--bg) 70%,transparent);border-bottom:1px solid var(--bd)}
.brand{font-weight:800;letter-spacing:-.02em}
nav.menu{display:flex;gap:.2rem;overflow-x:auto;scrollbar-width:none}
nav.menu a{color:var(--mut);text-decoration:none;font-size:.85rem;padding:.35rem .7rem;border-radius:99px;white-space:nowrap;transition:.25s}
nav.menu a:hover,nav.menu a.on{background:var(--ac);color:var(--on)}
button{font:inherit;cursor:pointer;border:1px solid var(--bd);background:var(--card);color:var(--ink);border-radius:99px;padding:.4rem .9rem}
button:focus-visible,summary:focus-visible,a:focus-visible{outline:3px solid var(--ac2);outline-offset:2px}
.hero{min-height:82vh;display:grid;place-content:center;text-align:center;padding:4rem 1.2rem;gap:1.2rem}
.hero small{letter-spacing:.2em;text-transform:uppercase;color:var(--ac);font-weight:700}
.hero h1{font-size:clamp(2rem,6vw,4.6rem);line-height:1.08;letter-spacing:-.035em;max-width:20ch;margin-inline:auto;background:linear-gradient(120deg,var(--ink),var(--ac) 60%,var(--ac2));-webkit-background-clip:text;background-clip:text;color:transparent}
.hero .by{color:var(--mut)}
.levels{position:sticky;top:62px;z-index:40;display:flex;gap:.3rem;justify-content:center;align-items:center;flex-wrap:wrap;padding:.6rem}
.levels span{font-size:.8rem;color:var(--mut)}
.levels button[aria-pressed=true]{background:linear-gradient(120deg,var(--ac),var(--ac2));color:var(--on);border-color:transparent}
main{max-width:1000px;margin:auto;padding:1rem clamp(1rem,4vw,2rem) 5rem;display:grid;gap:2.5rem}
section.mod{background:var(--card);border:1px solid var(--bd);border-radius:var(--r);padding:clamp(1.2rem,4vw,2.5rem);box-shadow:var(--sh);backdrop-filter:blur(12px)}
.rv{opacity:0;transform:translateY(30px);transition:opacity .8s,transform .8s}.rv.in{opacity:1;transform:none}
h2{font-size:clamp(1.4rem,3vw,2rem);letter-spacing:-.02em;line-height:1.2;margin-bottom:1rem}
h3{font-size:1.1rem;margin:1.2rem 0 .5rem}
p,li{margin-bottom:.6rem}ul,ol{padding-left:1.3rem}
.lv{display:none;border-left:4px solid var(--ac);padding:.2rem 0 .2rem 1rem;margin:.8rem 0;animation:fd .5s}
@keyframes fd{from{opacity:0;transform:translateX(-8px)}}
[data-level=facil] .lv.f,[data-level=medio] .lv.m,[data-level=experto] .lv.e{display:block}
.tag{display:inline-block;font-size:.7rem;font-weight:700;text-transform:uppercase;letter-spacing:.1em;background:var(--ac);color:var(--on);border-radius:99px;padding:.1rem .6rem;margin-bottom:.3rem}
details{border:1px solid var(--bd);border-radius:14px;margin:.7rem 0;background:color-mix(in srgb,var(--card) 80%,transparent);transition:.3s}
details[open]{border-color:var(--ac)}
summary{cursor:pointer;padding:.8rem 1rem;font-weight:600;list-style:none;display:flex;justify-content:space-between;gap:1rem}
summary::-webkit-details-marker{display:none}
summary::after{content:"+";font-size:1.3rem;line-height:1;color:var(--ac);transition:transform .3s}
details[open]>summary::after{transform:rotate(45deg)}
.in-d{padding:0 1rem 1rem}
.call{border-radius:14px;padding:1rem 1.2rem;margin:1rem 0;border:1px solid var(--warn);background:color-mix(in srgb,var(--warn) 10%,transparent)}
.call strong{color:var(--warn)}
.tw{overflow-x:auto;margin:1rem 0;border-radius:14px;border:1px solid var(--bd)}
table{border-collapse:collapse;width:100%;min-width:640px;font-size:.92rem}
th,td{padding:.7rem .9rem;text-align:left;vertical-align:top;border-bottom:1px solid var(--bd)}
th{background:color-mix(in srgb,var(--ac) 14%,transparent)}
kbd{font:inherit;font-size:.85em;background:var(--bg);border:1px solid var(--bd);border-bottom-width:2px;border-radius:6px;padding:0 .4em}
figure{margin:1.2rem 0;border-radius:16px;overflow:hidden;border:1px solid var(--bd)}
figure img{display:block;width:100%;max-height:340px;object-fit:cover;transition:transform .6s}
figure:hover img{transform:scale(1.04)}
figcaption{font-size:.8rem;color:var(--mut);padding:.5rem .8rem}
.ph{display:grid;place-content:center;min-height:160px;background:repeating-linear-gradient(45deg,transparent 0 12px,var(--bd) 12px 13px);color:var(--mut)}
.grid3{display:grid;gap:1rem;grid-template-columns:repeat(auto-fit,minmax(220px,1fr))}
footer{text-align:center;padding:3rem 1rem;color:var(--mut);border-top:1px solid var(--bd)}
@media(max-width:640px){header.top nav{display:none}}
@media(prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}.rv{opacity:1;transform:none}html{scroll-behavior:auto}}