:root {
  --teal-950:#0d3132; --teal-900:#0f3d3e; --teal-700:#147577; --teal-500:#14b8a6;
  --teal-300:#2dd4bf; --teal-100:#ccfbf1; --ink:#1e2a2b; --ink-soft:#5a6b6c;
  --bg:#f7fafa; --card:#fff; --border:#dbe5e5; --coral:#e2604a;
}
* { margin:0; box-sizing:border-box; }
html { scroll-behavior:smooth; }
body { font-family:'Segoe UI',system-ui,-apple-system,sans-serif; color:var(--ink); background:var(--bg); line-height:1.7; }
a { color:var(--teal-700); }

/* ---- wspólny nagłówek z menu ---- */
.topbar { background:var(--teal-950); position:sticky; top:0; z-index:20; }
.topbar__inner {
  max-width:1080px; margin:0 auto; padding:16px 24px;
  display:flex; align-items:center; justify-content:space-between;
}
.brand { font-size:1.3rem; font-weight:750; letter-spacing:-.02em; color:#fff; text-decoration:none; }
.brand span { color:var(--teal-300); }
.brand small { color:rgb(255 255 255 / .55); font-weight:400; }
.topnav { display:flex; gap:6px; align-items:center; }
.topnav a { color:rgb(255 255 255 / .85); text-decoration:none; font-size:.92rem; font-weight:500; padding:9px 14px; border-radius:8px; }
.topnav a:hover { color:#fff; background:rgb(255 255 255 / .08); }
.topnav a.cta { background:var(--teal-500); color:#06302b; font-weight:650; }
.topnav a.cta:hover { background:var(--teal-300); }
@media (max-width:640px){ .topnav a.hide-sm { display:none; } .topbar__inner { padding:14px 16px; } }

/* ---- blog index ---- */
.wrap { max-width:1080px; margin:0 auto; padding:0 24px; }
.blog-hero { background:var(--teal-900); color:#fff; padding:56px 0 48px; }
.blog-hero h1 { font-size:clamp(1.8rem,4vw,2.6rem); letter-spacing:-.02em; margin-bottom:10px; }
.blog-hero p { color:rgb(255 255 255 / .8); max-width:44em; }
.posts { display:grid; grid-template-columns:repeat(auto-fill,minmax(300px,1fr)); gap:22px; padding:48px 0 64px; }
.post-card {
  background:var(--card); border:1px solid var(--border); border-radius:14px;
  overflow:hidden; display:flex; flex-direction:column; text-decoration:none; color:inherit;
  transition:transform .15s, box-shadow .15s, border-color .15s;
}
.post-card:hover { transform:translateY(-3px); box-shadow:0 12px 30px rgb(15 61 62 / .12); border-color:var(--teal-500); }
.post-card__tag { font-size:.72rem; font-weight:700; text-transform:uppercase; letter-spacing:.05em; color:var(--teal-700); }
.post-card__body { padding:22px; display:flex; flex-direction:column; gap:8px; flex:1; }
.post-card h2 { font-size:1.15rem; line-height:1.35; letter-spacing:-.01em; }
.post-card p { font-size:.9rem; color:var(--ink-soft); flex:1; }
.post-card__more { color:var(--teal-700); font-weight:650; font-size:.9rem; }
.post-card__cover { height:8px; background:linear-gradient(90deg,var(--teal-500),var(--teal-700)); }

/* ---- artykuł ---- */
.article { max-width:720px; margin:0 auto; padding:48px 24px 72px; }
.article__tag { font-size:.78rem; font-weight:700; text-transform:uppercase; letter-spacing:.05em; color:var(--teal-700); }
.article h1 { font-size:clamp(1.7rem,3.6vw,2.4rem); letter-spacing:-.02em; margin:8px 0 12px; line-height:1.2; }
.article__meta { color:var(--ink-soft); font-size:.88rem; margin-bottom:32px; }
.article h2 { font-size:1.3rem; margin:34px 0 12px; color:var(--teal-900); letter-spacing:-.01em; }
.article h3 { font-size:1.08rem; margin:22px 0 8px; }
.article p, .article li { font-size:1.02rem; margin-bottom:14px; }
.article ul, .article ol { padding-left:22px; margin-bottom:16px; }
.article strong { color:var(--teal-900); }
.article blockquote {
  margin:20px 0; padding:14px 20px; border-left:4px solid var(--teal-500);
  background:var(--teal-100); border-radius:0 10px 10px 0; color:var(--teal-900);
}
.article__cta {
  margin:40px 0 8px; padding:26px; text-align:center;
  background:var(--teal-900); color:#fff; border-radius:16px;
}
.article__cta h3 { color:#fff; font-size:1.25rem; margin-bottom:6px; }
.article__cta p { color:rgb(255 255 255 / .8); margin-bottom:18px; }
.btn-cta {
  display:inline-block; background:var(--teal-500); color:#06302b; font-weight:700;
  padding:13px 28px; border-radius:999px; text-decoration:none;
}
.article figure { margin:22px 0; }
.article figure img { display:block; width:100%; border-radius:12px; border:1px solid var(--border); }
.article figure figcaption { margin-top:8px; font-size:.82rem; color:var(--ink-soft); text-align:center; }
.article a.inline { font-weight:600; }
.seealso { margin:36px 0 8px; padding:20px 22px; background:#fff; border:1px solid var(--border); border-radius:14px; }
.seealso h3 { font-size:1rem; color:var(--teal-900); margin-bottom:10px; }
.seealso ul { list-style:none; padding:0; margin:0; display:grid; gap:8px; }
.seealso a { display:inline-flex; gap:8px; text-decoration:none; color:var(--teal-700); font-weight:600; font-size:.92rem; }
.seealso a:hover { text-decoration:underline; }
.article__back { display:inline-block; margin-top:28px; color:var(--ink-soft); text-decoration:none; font-size:.9rem; }
.article__back:hover { color:var(--teal-700); }
.article__back--top { display:block; margin-top:0; margin-bottom:16px; font-weight:500; }

/* ---- stopka ---- */
.site-foot { border-top:1px solid var(--border); background:#fff; padding:28px 0; }
.site-foot .wrap { display:flex; flex-direction:column; align-items:center; gap:12px; text-align:center; font-size:.82rem; color:var(--ink-soft); }
.site-foot .foot-row { display:flex; flex-wrap:wrap; gap:6px 14px; justify-content:center; }
.site-foot a { color:inherit; }
.c3s-badge { display:inline-flex; flex-direction:column; align-items:center; gap:4px; text-decoration:none; }
.c3s-badge img { height:30px; }
.c3s-badge span { color:var(--teal-700); font-weight:650; font-size:.85rem; }

/* ── Pieczątka „dane, nie AI” — obrócona, podwójna ramka, teal ── */
.data-stamp{position:relative;display:inline-flex;flex-direction:column;align-items:center;gap:3px;padding:12px 22px;border:3px solid var(--teal-700,#147577);border-radius:10px;color:var(--teal-700,#147577);background:transparent;transform:rotate(-6deg);opacity:.92;text-align:center;line-height:1.12;font-family:system-ui,-apple-system,sans-serif}
.data-stamp::before{content:"";position:absolute;inset:3px;border:1.5px solid currentColor;border-radius:6px;opacity:.5;pointer-events:none}
.data-stamp__title{font-size:.98rem;font-weight:800;text-transform:uppercase;letter-spacing:.04em}
.data-stamp__src{font-size:.62rem;font-weight:700;text-transform:uppercase;letter-spacing:.1em;opacity:.8}
.data-stamp-wrap{display:flex;justify-content:center;margin:34px 0 6px}
@media print{.data-stamp{opacity:1;-webkit-print-color-adjust:exact;print-color-adjust:exact}}