:root {
    --bg: #f5f6f8;
    --surface: #ffffff;
    --text: #1d2330;
    --muted: #667085;
    --border: #d9dee7;
    --primary: #1f5eff;
    --primary-dark: #1747c4;
    --ok: #12805c;
    --warn: #b7791f;
    --bad: #c53030;
    --radius: 10px;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.5;
}

.wrap { max-width: 760px; margin: 0 auto; padding: 0 16px; }

.topbar { background: var(--surface); border-bottom: 1px solid var(--border); margin-bottom: 32px; }
.topbar__inner { display: flex; align-items: center; justify-content: space-between; gap: 12px; min-height: 60px; flex-wrap: wrap; }
.brand { font-weight: 700; font-size: 1.1rem; }
.brand__accent { color: var(--primary); }

.card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 28px; }
.card--narrow { max-width: 420px; margin: 0 auto; }
h1 { font-size: 1.4rem; margin: 0 0 4px; }
.muted { color: var(--muted); }

.form { display: flex; flex-direction: column; gap: 8px; margin-top: 20px; }
.form--row { flex-direction: row; flex-wrap: wrap; }
.form--row input[type="text"] { flex: 1 1 220px; }
.inline { display: flex; align-items: center; gap: 12px; }

label { font-weight: 600; font-size: .9rem; }
input[type="text"], input[type="password"] {
    padding: 10px 12px; border: 1px solid var(--border); border-radius: 8px; font-size: 1rem;
}
input:focus { outline: 2px solid var(--primary); outline-offset: 1px; }

.btn {
    padding: 10px 18px; border: 0; border-radius: 8px; background: var(--primary);
    color: #fff; font-weight: 600; font-size: 1rem; cursor: pointer;
}
.btn:hover { background: var(--primary-dark); }
.btn--ghost { background: transparent; color: var(--primary); border: 1px solid var(--border); padding: 6px 12px; font-size: .9rem; }
.btn--ghost:hover { background: var(--bg); }

.alert { padding: 12px 14px; border-radius: 8px; margin-top: 16px; }
.alert--error { background: #fdecec; color: var(--bad); border: 1px solid #f5c2c2; }
.alert--info { background: #eaf1ff; color: var(--primary-dark); border: 1px solid #c6d6ff; }

.result { display: flex; gap: 24px; align-items: center; margin-top: 24px; padding: 20px; border-radius: var(--radius); border: 1px solid var(--border); flex-wrap: wrap; }
.result__score { font-size: 3rem; font-weight: 800; line-height: 1; }
.result__score small { font-size: 1rem; color: var(--muted); font-weight: 500; }
.result__meta { display: grid; grid-template-columns: auto 1fr; gap: 4px 16px; margin: 0; }
.result__meta dt { color: var(--muted); }
.result__meta dd { margin: 0; font-weight: 600; }
.result--bajo .result__score { color: var(--ok); }
.result--medio .result__score { color: var(--warn); }
.result--alto .result__score { color: var(--bad); }

.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }

@media (max-width: 480px) {
    .card { padding: 20px; }
    .form--row .btn { width: 100%; }
}