/* Stas - case studies HTM. Wspólny arkusz stylów. Motyw spójny z landingiem. */
:root {
  --bg: #0b0b10;
  --bg-soft: #12121a;
  --text: #ededf2;
  --muted: #9b9ba8;
  --accent: #c8f169;
  --accent-ink: #10150a;
  --border: #2c2c3a;
  --border-soft: #23232f;
  --card: #12121a;
  /* Glass */
  --glass-bg: rgba(20, 20, 30, 0.55);
  --glass-bg-strong: rgba(16, 16, 24, 0.72);
  --glass-border: rgba(255, 255, 255, 0.09);
  --glass-border-hi: rgba(200, 241, 105, 0.22);
  --glass-shadow: 0 12px 40px rgba(0, 0, 0, 0.45);
  --glass-blur: blur(14px) saturate(140%);
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  position: relative;
}

/* ---- Poświaty tła (dla efektu glass) ---- */
body::before, body::after {
  content: '';
  position: fixed;
  z-index: -1;
  pointer-events: none;
  filter: blur(90px);
}
body::before {
  width: 560px; height: 560px;
  top: -160px; right: -140px;
  background: radial-gradient(circle, rgba(200, 241, 105, 0.16), transparent 65%);
}
body::after {
  width: 620px; height: 620px;
  bottom: -220px; left: -180px;
  background: radial-gradient(circle, rgba(139, 124, 246, 0.16), transparent 65%);
}
.glow-orb {
  position: fixed; z-index: -1; pointer-events: none;
  border-radius: 50%; filter: blur(80px);
}
.glow-orb.orb-1 {
  width: 420px; height: 420px;
  top: 30%; left: -180px;
  background: radial-gradient(circle, rgba(34, 211, 238, 0.10), transparent 65%);
}
.glow-orb.orb-2 {
  width: 380px; height: 380px;
  bottom: 5%; right: -140px;
  background: radial-gradient(circle, rgba(200, 241, 105, 0.10), transparent 65%);
}

/* ---- Nawigacja (spójna z landingiem) ---- */
.nav {
  position: sticky; top: 0; z-index: 50;
  background: var(--glass-bg-strong);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border-bottom: 1px solid var(--glass-border);
}
.nav-inner {
  max-width: 1180px; margin: 0 auto; padding: 0.9rem 1.25rem;
  display: flex; align-items: center; justify-content: space-between; gap: 1rem;
}
.brand { display: inline-flex; align-items: center; gap: 0.55rem; text-decoration: none; color: var(--text); }
.brand-logo { width: 2.1rem; height: 2.1rem; object-fit: contain; display: block; flex-shrink: 0; }
.brand-mark {
  width: 2rem; height: 2rem; border-radius: 8px;
  background: var(--accent); color: var(--accent-ink);
  display: inline-flex; align-items: center; justify-content: center;
  font-weight: 800; font-size: 1.05rem;
}
.brand-text { font-weight: 700; letter-spacing: 0.02em; }
.brand-text em { font-style: normal; color: var(--accent); }
.nav-links { display: flex; gap: 1.3rem; align-items: center; }
.nav-links a { color: var(--muted); text-decoration: none; font-size: 0.95rem; transition: color 0.15s; }
.nav-links a:hover, .nav-links a.active { color: var(--text); }
.btn {
  position: relative;
  display: inline-block; padding: 0.6rem 1.25rem; border-radius: 999px;
  font-weight: 650; text-decoration: none; transition: transform 0.15s ease, box-shadow 0.15s ease, background 0.15s ease, border-color 0.15s ease;
  font-size: 0.95rem;
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.25);
  overflow: hidden;
}
/* Szklany połysk (sheen) na gorze przycisku */
.btn::after {
  content: '';
  position: absolute; inset: 0;
  border-radius: inherit;
  background: linear-gradient(115deg,
    rgba(255, 255, 255, 0.45) 0%,
    rgba(255, 255, 255, 0.12) 35%,
    transparent 55%);
  pointer-events: none;
}
.btn:hover { transform: translateY(-2px); }
/* Glass primary: limonkowe szklo z ciemnym tekstem (kontrast AAA) */
.btn-primary {
  background: linear-gradient(135deg, rgba(200, 241, 105, 0.92), rgba(163, 214, 70, 0.78));
  color: var(--accent-ink);
  border: 1px solid rgba(255, 255, 255, 0.35);
  box-shadow: 0 0 0 1px rgba(200, 241, 105, 0.25), 0 8px 30px rgba(200, 241, 105, 0.3), inset 0 1px 0 rgba(255, 255, 255, 0.55);
}
.btn-primary:hover {
  background: linear-gradient(135deg, rgba(205, 245, 112, 0.97), rgba(178, 228, 82, 0.85));
  box-shadow: 0 0 0 1px rgba(200, 241, 105, 0.4), 0 12px 38px rgba(200, 241, 105, 0.38), inset 0 1px 0 rgba(255, 255, 255, 0.6);
}
/* Glass ghost: ciemne szklo z jasna obwodka */
.btn-ghost {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  color: var(--text);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.12);
}
.btn-ghost::after {
  background: linear-gradient(115deg,
    rgba(255, 255, 255, 0.18) 0%,
    rgba(255, 255, 255, 0.05) 40%,
    transparent 60%);
}
.btn-ghost:hover {
  border-color: var(--glass-border-hi);
  background: rgba(24, 24, 36, 0.6);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.15), 0 0 20px rgba(200, 241, 105, 0.08);
}
@media (max-width: 640px) {
  .nav-links { display: none; }
}

/* ---- Hero ---- */
.hero { padding: 4.5rem 1.25rem 3rem; text-align: center; }
.hero h1 {
  font-size: clamp(2.2rem, 5.5vw, 3.6rem); line-height: 1.1; letter-spacing: -0.03em;
  margin: 1.1rem auto 1.2rem; max-width: 22ch;
}
.hero .grad { background: linear-gradient(92deg, var(--accent), #8b7cf6); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero p.lead { color: var(--muted); font-size: clamp(1.02rem, 2vw, 1.22rem); max-width: 66ch; margin: 0 auto 2rem; }
.badge {
  display: inline-block; border: 1px solid var(--glass-border); color: var(--muted);
  border-radius: 999px; padding: 0.35rem 0.9rem; font-size: 0.85rem;
  background: var(--glass-bg); backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
}

/* ---- Filtry ---- */
.filters { display: flex; flex-wrap: wrap; gap: 0.6rem; justify-content: center; margin: 0 auto 2.2rem; max-width: 720px; }
.filter-btn {
  background: var(--glass-bg); border: 1px solid var(--glass-border); color: var(--muted);
  border-radius: 999px; padding: 0.45rem 1.1rem; font: inherit; font-size: 0.92rem;
  cursor: pointer; transition: all 0.15s;
  backdrop-filter: var(--glass-blur); -webkit-backdrop-filter: var(--glass-blur);
}
.filter-btn:hover { border-color: #4a4a5e; color: var(--text); background: rgba(24, 24, 36, 0.6); }
.filter-btn.active { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); font-weight: 650; }

/* ---- Masonry (ala Pinterest) ---- */
.masonry {
  max-width: 1180px; margin: 0 auto; padding: 0 1.25rem 3rem;
  column-count: 3; column-gap: 1.1rem;
}
@media (max-width: 1024px) { .masonry { column-count: 2; } }
@media (max-width: 640px) { .masonry { column-count: 1; } }

.case-card {
  break-inside: avoid; margin-bottom: 1.1rem;
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border); border-radius: 18px;
  overflow: hidden; display: block; text-decoration: none; color: var(--text);
  box-shadow: var(--glass-shadow);
  transition: transform 0.18s ease, border-color 0.18s ease, box-shadow 0.18s ease, background 0.18s ease;
}
.case-card:hover {
  transform: translateY(-4px);
  border-color: var(--glass-border-hi);
  background: rgba(24, 24, 36, 0.65);
  box-shadow: 0 16px 44px rgba(0, 0, 0, 0.55), 0 0 0 1px rgba(200, 241, 105, 0.12);
}
.case-thumb {
  position: relative; aspect-ratio: 16/10; overflow: hidden;
  display: flex; align-items: flex-end;
}
.case-thumb img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.case-thumb.tall { aspect-ratio: 16/13; }
.thumb-label {
  position: relative; z-index: 1; margin: auto 0 0;
  padding: 0.5rem 0.9rem; width: 100%;
  font-size: 0.72rem; font-weight: 700; letter-spacing: 0.04em; text-transform: uppercase;
  color: #fff; background: linear-gradient(180deg, transparent, rgba(0,0,0,0.72));
}
.case-body { padding: 1rem 1.1rem 1.15rem; }
.case-tags { display: flex; flex-wrap: wrap; gap: 0.4rem; margin-bottom: 0.6rem; }
.case-tag {
  font-size: 0.72rem; font-weight: 650; letter-spacing: 0.02em; text-transform: uppercase;
  color: var(--accent-ink); background: var(--accent); border-radius: 999px; padding: 0.14rem 0.6rem;
}
.case-tag.world { background: #8b7cf6; color: #fff; }
.case-tag.lesson { background: transparent; color: var(--muted); border: 1px solid var(--border); }
.case-card h3 { margin: 0 0 0.4rem; font-size: 1.12rem; letter-spacing: -0.01em; line-height: 1.3; }
.case-card p { margin: 0; color: var(--muted); font-size: 0.93rem; }
.case-stat {
  margin-top: 0.85rem; padding-top: 0.8rem; border-top: 1px solid var(--border-soft);
  font-size: 1.05rem; font-weight: 750; color: var(--accent);
}
.case-stat small { display: block; font-weight: 400; font-size: 0.8rem; color: var(--muted); margin-top: 0.15rem; }

/* ---- Sekcje podstron ---- */
.wrap { max-width: 860px; margin: 0 auto; padding: 2.5rem 1.25rem 4rem; }
.back-link { display: inline-block; color: var(--muted); text-decoration: none; font-size: 0.92rem; margin-bottom: 1.6rem; }
.back-link:hover { color: var(--accent); }
.article-hero { margin-bottom: 2.2rem; }
.article-hero-img { margin: 0 0 2rem; border-radius: 18px; overflow: hidden; border: 1px solid var(--border-soft); }
.article-hero-img img { display: block; width: 100%; height: auto; }
.article-hero .case-tags { margin-bottom: 0.7rem; }
.article-hero h1 { font-size: clamp(1.9rem, 4.5vw, 2.9rem); line-height: 1.12; letter-spacing: -0.025em; margin: 0 0 0.8rem; }
.article-hero .lead { color: var(--muted); font-size: 1.08rem; max-width: 68ch; margin: 0; }
.stat-row { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 0.9rem; margin: 1.8rem 0; }
.stat-box {
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border); border-radius: 14px;
  padding: 1rem 1.1rem; box-shadow: 0 6px 24px rgba(0, 0, 0, 0.3);
}
.stat-box .num { font-size: 1.5rem; font-weight: 800; color: var(--accent); line-height: 1.2; }
.stat-box .lbl { font-size: 0.85rem; color: var(--muted); margin-top: 0.25rem; }
h2.sec { font-size: 1.45rem; letter-spacing: -0.015em; margin: 2.4rem 0 0.9rem; }
h2.sec .eyebrow { display: block; font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.06em; color: var(--muted); margin-bottom: 0.3rem; }
.article-body p { margin: 0 0 1rem; color: #d7d7e0; }
.article-body ul, .article-body ol { color: #d7d7e0; padding-left: 1.3rem; margin: 0 0 1.1rem; }
.article-body li { margin-bottom: 0.45rem; }
.article-body strong { color: var(--text); }
.article-body blockquote {
  margin: 1.4rem 0; padding: 1rem 1.2rem; border-left: 3px solid var(--accent);
  background: var(--glass-bg); backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border-radius: 0 12px 12px 0; color: var(--text);
}
.lesson-box {
  background: var(--glass-bg-strong);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border-hi); border-radius: 14px;
  padding: 1.2rem 1.3rem; margin: 1.4rem 0;
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.35);
}
.lesson-box h3 { margin: 0 0 0.6rem; font-size: 1.05rem; color: var(--accent); }
.lesson-box ul { margin: 0; }
.source-list { font-size: 0.9rem; color: var(--muted); }
.source-list li { margin-bottom: 0.35rem; }
.source-list code { background: var(--bg-soft); border: 1px solid var(--border-soft); border-radius: 6px; padding: 0.1rem 0.4rem; font-size: 0.82rem; }

/* ---- CTA ---- */
.cta-box {
  margin-top: 3rem; text-align: center;
  background: var(--glass-bg-strong);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border); border-radius: 18px;
  padding: 2.2rem 1.5rem; box-shadow: var(--glass-shadow);
}
.cta-box h2 { margin: 0 0 0.6rem; font-size: 1.5rem; }
.cta-box p { color: var(--muted); margin: 0 0 1.3rem; }
.cta-box .btn { margin: 0 0.3rem; }

/* ---- Stopka ---- */
.footer { border-top: 1px solid var(--border-soft); padding: 2rem 1.25rem; text-align: center; color: var(--muted); font-size: 0.88rem; }
.footer a { color: var(--muted); text-decoration: none; }
.footer a:hover { color: var(--accent); }