:root{
  --bg:#f3f5fa; --surface:#fff; --ink:#15223b; --muted:#5f6c84; --line:#e0e6f0;
  --navy:#003a8c; --orange:#ff6900; --coral:#d55865; --green:#1f9d57;
  --shadow:0 1px 2px rgba(20,34,59,.05),0 10px 30px rgba(20,34,59,.08);
}
@media (prefers-color-scheme:dark){
  :root{--bg:#0d1420;--surface:#151e2f;--ink:#e8edf6;--muted:#9aa7bf;--line:#243049;
        --navy:#6ea0ff;--orange:#ff9a4d;--coral:#ff8a96;--green:#4cc585;
        --shadow:0 1px 2px rgba(0,0,0,.3),0 10px 30px rgba(0,0,0,.35);}
}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--ink);
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;line-height:1.5}
.wrap{max-width:1040px;margin:0 auto;padding:28px 22px 60px}
h1{font-size:1.5rem;margin:0 0 4px;letter-spacing:-.01em}
.muted{color:var(--muted)}
.topbar{display:flex;justify-content:space-between;align-items:center;gap:16px;
  padding:14px 22px;background:var(--surface);border-bottom:1px solid var(--line)}
.brand{font-weight:800;letter-spacing:-.01em;color:var(--navy)}
.user{display:flex;align-items:center;gap:14px;font-size:.92rem;color:var(--muted)}
.btn-ghost{color:var(--navy);text-decoration:none;border:1px solid var(--line);
  padding:5px 12px;border-radius:8px;font-size:.88rem}
.btn-ghost:hover{background:var(--bg)}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:16px;margin-top:20px}
.card{display:block;text-decoration:none;color:inherit;background:var(--surface);
  border:1px solid var(--line);border-radius:14px;padding:18px;box-shadow:var(--shadow);
  transition:transform .08s ease,box-shadow .08s ease}
.card:hover{transform:translateY(-2px);box-shadow:0 2px 4px rgba(20,34,59,.08),0 16px 40px rgba(20,34,59,.12)}
.card-tag{display:inline-block;font-size:.7rem;letter-spacing:.06em;text-transform:uppercase;
  font-weight:700;padding:2px 9px;border-radius:20px;margin-bottom:10px}
.card-tag.own{background:rgba(31,157,87,.14);color:var(--green)}
.card-tag.shared{background:rgba(255,105,0,.14);color:var(--orange)}
.card-title{font-weight:700;font-size:1.05rem;margin-bottom:4px}
.card-desc{color:var(--muted);font-size:.88rem;margin-bottom:10px}
.card-meta{color:var(--muted);font-size:.78rem}
.empty{margin-top:30px;padding:40px;text-align:center;color:var(--muted);
  background:var(--surface);border:1px dashed var(--line);border-radius:14px}
/* login */
.login-body{display:flex;min-height:100vh;align-items:center;justify-content:center}
.login-card{background:var(--surface);border:1px solid var(--line);border-radius:16px;
  box-shadow:var(--shadow);padding:30px;width:100%;max-width:360px;display:flex;flex-direction:column}
.login-card .brand{font-size:1.3rem;margin-bottom:2px}
.login-card label{font-size:.82rem;color:var(--muted);margin:14px 0 5px;font-weight:600}
.login-card input{padding:11px 13px;border:1px solid var(--line);border-radius:9px;
  background:var(--bg);color:var(--ink);font-size:1rem}
.login-card input:focus{outline:2px solid var(--navy);border-color:transparent}
.login-card button{margin-top:22px;padding:12px;border:0;border-radius:9px;background:var(--navy);
  color:#fff;font-weight:700;font-size:1rem;cursor:pointer}
.login-card button:hover{filter:brightness(1.08)}
.alert{background:rgba(213,88,101,.14);color:var(--coral);padding:10px 12px;border-radius:9px;
  font-size:.88rem;margin-top:10px}
/* card con footer de compartir */
.grid .card{padding:0;overflow:hidden;display:flex;flex-direction:column}
.card-main{display:block;text-decoration:none;color:inherit;padding:18px 18px 12px;flex:1}
.card-foot{display:flex;justify-content:space-between;align-items:center;gap:10px;
  padding:9px 16px;border-top:1px solid var(--line)}
.card-share{font-size:.8rem;font-weight:700;color:var(--navy);text-decoration:none;
  border:1px solid var(--line);padding:3px 11px;border-radius:7px}
.card-share:hover{background:var(--bg)}