/* Btc Blake2b Wallet — sito (mobile-first, dark/light, WCAG AA) */
:root {
  --bg: #0a0f1e;
  --bg-soft: #111a30;
  --surface: #16203a;
  --text: #e8ecf5;
  --text-dim: #a9b4cc;
  --accent: #3b82f6;
  --accent-strong: #2563eb;
  --orange: #f7931a;
  --border: rgba(255, 255, 255, 0.08);
  --ok: #34d399;
  --warn: #fbbf24;
  --radius: 14px;
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
}
@media (prefers-color-scheme: light) {
  :root {
    --bg: #f6f8fc;
    --bg-soft: #ffffff;
    --surface: #eef2fa;
    --text: #0f172a;
    --text-dim: #475569;
    --border: rgba(15, 23, 42, 0.12);
    --shadow: 0 10px 30px rgba(15, 23, 42, 0.08);
  }
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
.container { max-width: 1080px; margin: 0 auto; padding: 0 20px; }
a { color: var(--accent); }
a:hover { color: var(--accent-strong); }
.skip-link {
  position: absolute; left: -999px; top: 0; background: var(--accent);
  color: #fff; padding: 8px 14px; border-radius: 0 0 8px 0; z-index: 20;
}
.skip-link:focus { left: 0; color: #fff; }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; border-radius: 4px; }

/* Header */
.site-header { border-bottom: 1px solid var(--border); background: color-mix(in srgb, var(--bg) 85%, transparent); backdrop-filter: blur(8px); position: sticky; top: 0; z-index: 10; }
.nav { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 14px 20px; flex-wrap: wrap; }
.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--text); text-decoration: none; font-weight: 700; }
.brand-mark {
  display: inline-grid; place-items: center; width: 34px; height: 34px;
  border-radius: 9px; background: linear-gradient(135deg, var(--accent), var(--orange));
  color: #fff; font-weight: 800; font-size: 18px;
}
.nav-links { display: flex; gap: 6px; list-style: none; margin: 0; padding: 0; flex-wrap: wrap; }
.nav-links a { color: var(--text-dim); text-decoration: none; padding: 8px 12px; border-radius: 8px; font-size: 0.95rem; }
.nav-links a:hover { color: var(--text); background: var(--surface); }
.nav-links a[aria-current="page"] { color: var(--text); font-weight: 600; }

/* Hero */
.hero { padding: 72px 0 56px; background: radial-gradient(900px 400px at 70% -10%, rgba(59, 130, 246, 0.18), transparent), radial-gradient(700px 340px at 10% 10%, rgba(247, 147, 26, 0.12), transparent); }
.eyebrow { color: var(--orange); font-weight: 700; letter-spacing: 0.06em; text-transform: uppercase; font-size: 0.8rem; margin: 0 0 12px; }
.hero h1 { font-size: clamp(2rem, 5vw, 3.4rem); line-height: 1.12; margin: 0 0 18px; }
.accent { background: linear-gradient(90deg, var(--accent), var(--orange)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.lead { font-size: 1.15rem; color: var(--text-dim); max-width: 640px; margin: 0 0 26px; }
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; }
.disclaimer-inline { margin-top: 22px; font-size: 0.85rem; color: var(--warn); }

/* Buttons */
.btn { display: inline-block; padding: 13px 22px; border-radius: 12px; text-decoration: none; font-weight: 600; font-size: 1rem; border: 1px solid transparent; transition: transform 0.06s ease, filter 0.15s ease; }
.btn:active { transform: translateY(1px); }
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-strong); color: #fff; filter: brightness(1.05); }
.btn-ghost { border-color: var(--border); color: var(--text); background: var(--bg-soft); }
.btn-ghost:hover { border-color: var(--accent); color: var(--text); }
.btn-lg { padding: 16px 28px; font-size: 1.1rem; }

/* Sections */
.features, .honesty { padding: 56px 0; }
.features h2, .honesty h2, .page h1 { margin-top: 0; }
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 16px; }
.card { background: var(--bg-soft); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; box-shadow: var(--shadow); }
.card h3 { margin: 0 0 8px; font-size: 1.05rem; }
.card p { margin: 0; color: var(--text-dim); font-size: 0.95rem; }
.honesty { background: var(--bg-soft); border-block: 1px solid var(--border); }
.honesty ul { padding-left: 4px; list-style: none; display: grid; gap: 12px; }
.honesty li { padding-left: 26px; position: relative; color: var(--text-dim); }
.honesty li::before { content: "→"; position: absolute; left: 0; color: var(--accent); font-weight: 700; }

/* PERCHÉ: separa il percorso di onboarding dalle card delle feature per favorire la scansione. */
.journey { padding: 56px 0; background: var(--bg); }
.journey-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 16px; }
.journey-step { padding: 20px 0; border-top: 2px solid var(--accent); }
.step-number { color: var(--orange); font-size: 0.8rem; font-weight: 700; letter-spacing: 0.08em; }
.journey-step h3 { margin: 12px 0 8px; }
.journey-step p { margin: 0; color: var(--text-dim); }

/* PERCHÉ: details mantiene le FAQ accessibili senza introdurre JavaScript. */
.faq { padding: 56px 0; background: var(--bg-soft); border-block: 1px solid var(--border); }
.faq details { border-top: 1px solid var(--border); padding: 16px 0; }
.faq details:last-child { border-bottom: 1px solid var(--border); }
.faq summary { cursor: pointer; font-weight: 600; }
.faq details p { max-width: 720px; margin: 12px 0 0; color: var(--text-dim); }

/* Pages */
.page { padding: 40px 0 64px; max-width: 820px; }
.page h1 { font-size: 2rem; }
.page h2 { margin-top: 34px; font-size: 1.3rem; }
.page h3 { margin-top: 26px; font-size: 1.05rem; }
.page .small { color: var(--text-dim); }
pre {
  background: var(--surface); border: 1px solid var(--border);
  padding: 14px; border-radius: 10px; overflow-x: auto; font-size: 0.85rem;
  white-space: pre-wrap; word-break: break-all;
}
.download-box { background: var(--bg-soft); border: 1px solid var(--border); border-radius: var(--radius); padding: 22px; box-shadow: var(--shadow); margin: 20px 0; }
.checksum code { color: var(--ok); }
.notice { border-left: 4px solid var(--warn); background: var(--bg-soft); padding: 14px 16px; border-radius: 0 10px 10px 0; margin: 26px 0; }

/* Footer */
.site-footer { border-top: 1px solid var(--border); padding: 28px 0; color: var(--text-dim); font-size: 0.9rem; }
.footer-grid { display: flex; justify-content: space-between; gap: 20px; flex-wrap: wrap; }
.footer-links { list-style: none; margin: 0; padding: 0; display: grid; gap: 6px; }
.footer-links a { color: var(--text-dim); text-decoration: none; }
.footer-links a:hover { color: var(--accent); }

@media (prefers-reduced-motion: reduce) {
  * { scroll-behavior: auto !important; transition: none !important; }
}

@media (max-width: 640px) {
  .brand-name { max-width: 190px; }
  .nav-links { width: 100%; }
  .nav-links a { padding-inline: 8px; }
  .hero { padding-top: 52px; }
}