:root{
  --bg:#0b1220; --bg-alt:#101a2e; --card:#16233d; --text:#fff; --muted:#a9b8d0;
  --primary:#38bdf8; --accent:#2dd4bf; --violet:#8b5cf6; --warn:#fb923c; --danger:#f87171;
  --border:rgba(255,255,255,.10); --radius:14px;
}
*{box-sizing:border-box;margin:0;padding:0;-webkit-tap-highlight-color:transparent}
html,body{height:100%}
body{font-family:system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;background:var(--bg);color:var(--text);line-height:1.45;
  display:flex;flex-direction:column;align-items:center}
button{font:inherit;color:inherit;cursor:pointer}
a{color:var(--primary)}

.shell{width:100%;max-width:480px;min-height:100%;display:flex;flex-direction:column;background:var(--bg);position:relative}
.demo-banner{background:linear-gradient(90deg,var(--primary),var(--violet));color:#06101f;font-size:.8rem;font-weight:700;text-align:center;padding:.45rem .8rem}
.demo-banner a{color:#06101f;text-decoration:underline}
.top{display:flex;align-items:center;gap:.6rem;padding:.8rem 1rem;border-bottom:1px solid var(--border);position:sticky;top:0;background:rgba(11,18,32,.95);backdrop-filter:blur(8px);z-index:5}
.top h1{font-size:1.15rem;flex:1}
.top .back{text-decoration:none;font-size:.9rem;color:var(--muted)}
.top .ghost{background:none;border:1px solid var(--border);border-radius:8px;padding:.3rem .7rem;font-size:.8rem;color:var(--muted)}
.content{flex:1;padding:1rem 1rem 6rem}
.tabs{position:fixed;bottom:0;left:50%;transform:translateX(-50%);width:100%;max-width:480px;display:grid;grid-template-columns:repeat(4,1fr);background:var(--bg-alt);border-top:1px solid var(--border);z-index:6}
.tabs button{background:none;border:0;padding:.7rem 0 .8rem;font-size:.75rem;color:var(--muted);display:grid;gap:.15rem;justify-items:center;position:relative}
.tabs button span{font-size:1.25rem}
.tabs button.on{color:var(--primary)}
.tabs .count{position:absolute;top:.35rem;left:calc(50% + 6px);background:var(--danger);color:#fff;border-radius:99px;font-size:.65rem;font-weight:700;min-width:18px;padding:0 5px}

.btn{display:inline-block;background:linear-gradient(90deg,var(--primary),var(--violet));color:#06101f;font-weight:700;border:0;border-radius:10px;padding:.7rem 1.1rem;text-decoration:none;text-align:center}
.btn.alt{background:transparent;border:1px solid var(--primary);color:var(--primary)}
.btn.wa{background:#25d366;color:#06101f}
.btn.block{display:block;width:100%}
.card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:1rem}
.muted{color:var(--muted);font-size:.85rem}
.toast{position:fixed;left:50%;bottom:5.2rem;transform:translate(-50%,20px);background:#1d2f52;border:1px solid var(--border);border-radius:12px;padding:.7rem .9rem;max-width:92%;width:440px;box-shadow:0 10px 30px rgba(0,0,0,.45);opacity:0;pointer-events:none;transition:.25s;z-index:20;display:flex;gap:.7rem;align-items:center;justify-content:space-between;font-size:.9rem}
.toast.show{opacity:1;transform:translate(-50%,0);pointer-events:auto}

/* PWA en iPhone: respetar la muesca y la barra inferior */
.demo-banner{padding-top:calc(.45rem + env(safe-area-inset-top))}
.tabs{padding-bottom:env(safe-area-inset-bottom)}
.toast{margin-bottom:env(safe-area-inset-bottom)}