:root {
  /* openalt.org — teal ring */
  --org-dark: #0a514c;
  --org: #009d92;
  --org-light: #92c3bc;
  /* openalt.cz — red ring */
  --cz-dark: #701512;
  --cz: #be1622;
  --cz-light: #d87a68;
  /* openalt.ro — Romanian tricolour on GitHub-dark */
  --ro-blue: #002b7f;
  --ro-yellow: #fcd116;
  --ro-red: #ce1126;
  --ro-bg: #0d1117;
  --ro-surface: #161b22;
  --ro-line: #21262d;
  --ro-text: #dcdcdf;
  --ro-muted: #8b949e;

  --bg: #f3f7f6;
  --surface: #ffffff;
  --text: #1e1e1c;
  --muted: #5d6664;
  --line: #dde6e4;
  --shadow: 0 1px 2px rgba(10, 81, 76, .06), 0 12px 32px rgba(10, 81, 76, .08);
  --radius: 20px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b1211;
    --surface: #131c1b;
    --text: #eef3f2;
    --muted: #9aa8a5;
    --line: #23302e;
    --shadow: 0 1px 2px rgba(0, 0, 0, .4), 0 12px 32px rgba(0, 0, 0, .3);
  }
}

* { box-sizing: border-box; }
html, body { margin: 0; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  line-height: 1.55;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; }
img { display: block; }

.wrap {
  width: 100%;
  max-width: 1040px;
  margin: 0 auto;
  padding: 0 20px;
}

/* ---------- Hero ---------- */
.hero {
  text-align: center;
  padding-top: clamp(16px, 3.5vh, 44px);
  padding-bottom: 28px;
}
.hero-rings {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 24px;
  margin-bottom: 16px;
}
.hero-rings img { width: 80px; height: 80px; opacity: .9; }
.hero-rings img.main { width: 168px; height: 168px; opacity: 1; }
.hero h1 {
  font-size: clamp(2.2rem, 6vw, 3rem);
  font-weight: 700;
  letter-spacing: -.02em;
  line-height: 1.05;
  margin: 0 0 8px;
}
.hero p {
  margin: 0 auto;
  max-width: 44em;
  color: var(--muted);
  font-size: 1.125rem;
}
.hero p em { font-style: normal; color: var(--org); font-weight: 600; }
@media (prefers-color-scheme: dark) { .hero p em { color: var(--org-light); } }

/* ---------- Cards ---------- */
.projects { display: grid; gap: 20px; padding-bottom: 36px; }
.row { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }

.card {
  position: relative;
  display: flex;
  flex-direction: column;
  border-radius: var(--radius);
  padding: 24px 26px;
  background: var(--surface);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  overflow: hidden;
}
.card-head { display: flex; align-items: center; gap: 16px; margin-bottom: 14px; }
.badge {
  flex: none;
  width: 60px; height: 60px;
  border-radius: 16px;
  display: grid; place-items: center;
}
.badge img { width: 40px; height: 40px; }
.eyebrow {
  margin: 0;
  font-size: .75rem;
  font-weight: 700;
  letter-spacing: .09em;
  text-transform: uppercase;
}
.card h2 { margin: 0; font-size: 1.375rem; font-weight: 700; letter-spacing: -.01em; line-height: 1.25; }
.card .desc { margin: 0 0 18px; color: var(--muted); }
.card-foot {
  margin-top: auto;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 11px 20px;
  border-radius: 999px;
  font-weight: 600;
  font-size: .95rem;
  text-decoration: none;
  transition: transform .15s ease, filter .15s ease;
}
.btn svg { width: 18px; height: 18px; transition: transform .15s ease; }
.btn:hover { filter: brightness(1.08); }
.btn:hover svg { transform: translateX(3px); }
.btn:focus-visible, .social a:focus-visible { outline: 3px solid currentColor; outline-offset: 3px; }

.social { display: flex; flex-wrap: wrap; gap: 8px; list-style: none; margin: 0; padding: 0; }
.social a {
  width: 38px; height: 38px;
  border-radius: 50%;
  display: grid; place-items: center;
  transition: background-color .15s ease, color .15s ease, transform .15s ease;
}
.social a:hover { transform: translateY(-2px); }
.social svg { width: 18px; height: 18px; fill: currentColor; }

/* openalt.org — featured */
.card.org {
  padding: 30px 36px;
  color: #fff;
  border: 0;
  background:
    radial-gradient(120% 140% at 100% 0%, rgba(146, 195, 188, .35) 0%, rgba(146, 195, 188, 0) 55%),
    linear-gradient(135deg, var(--org-dark) 0%, #08635c 50%, var(--org) 100%);
}
.card.org::after {
  /* oversized ring watermark */
  content: "";
  position: absolute;
  right: -90px; bottom: -110px;
  width: 360px; height: 360px;
  background: url(../img/openalt-org.svg) center / contain no-repeat;
  opacity: .14;
  pointer-events: none;
}
.card.org > * { position: relative; z-index: 1; }
.card.org .badge { width: 76px; height: 76px; background: #fff; border-radius: 20px; }
.card.org .badge img { width: 52px; height: 52px; }
.card.org .eyebrow { color: var(--org-light); }
.card.org h2 { font-size: clamp(1.6rem, 4vw, 2.1rem); }
.card.org .desc { color: rgba(255, 255, 255, .86); font-size: 1.05rem; max-width: 46em; }
.card.org .btn { background: #fff; color: var(--org-dark); }
.card.org .social a { background: rgba(255, 255, 255, .12); color: #fff; }
.card.org .social a:hover { background: #fff; color: var(--org-dark); }

/* openalt.cz — conference */
.card.cz { border-top: 0; }
.card.cz::before {
  content: "";
  position: absolute; inset: 0 0 auto 0; height: 5px;
  background: linear-gradient(90deg, var(--cz-dark), var(--cz) 50%, var(--cz-light));
}
.card.cz .badge { background: #fbeceb; }
.card.cz .eyebrow { color: var(--cz); }
.card.cz .btn { background: var(--cz); color: #fff; }
.card.cz .social a { background: #fbeceb; color: var(--cz-dark); }
.card.cz .social a:hover { background: var(--cz); color: #fff; }
@media (prefers-color-scheme: dark) {
  .card.cz .badge, .card.cz .social a { background: #2a1615; }
  .card.cz .eyebrow { color: var(--cz-light); }
  .card.cz .social a { color: var(--cz-light); }
}

/* openalt.ro — meetup, mirrors openalt.ro's dark look */
.card.ro {
  background: var(--ro-bg);
  border-color: var(--ro-line);
  color: var(--ro-text);
}
.card.ro::before {
  content: "";
  position: absolute; inset: 0 0 auto 0; height: 5px;
  background: linear-gradient(90deg, var(--ro-blue) 0 33.3%, var(--ro-yellow) 33.3% 66.6%, var(--ro-red) 66.6%);
}
.card.ro .badge { background: var(--ro-surface); border: 1px solid var(--ro-line); }
.card.ro .eyebrow { color: var(--ro-yellow); }
.card.ro h2 { color: #fff; }
.card.ro .desc { color: var(--ro-muted); }
.card.ro .btn { background: var(--ro-yellow); color: var(--ro-bg); }
.card.ro .social a { background: var(--ro-surface); color: var(--ro-text); border: 1px solid var(--ro-line); }
.card.ro .social a:hover { background: var(--ro-yellow); color: var(--ro-bg); border-color: var(--ro-yellow); }

/* ---------- Footer ---------- */
footer {
  margin-top: auto;
  border-top: 1px solid var(--line);
  padding: 18px 0 22px;
  color: var(--muted);
  font-size: .875rem;
}
footer .wrap { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: 8px 24px; }
footer p { margin: 0; }
footer .credits { font-size: .8rem; opacity: .85; }

@media (max-width: 720px) {
  .row { grid-template-columns: 1fr; }
  .card, .card.org { padding: 24px; }
  .card.org .badge { width: 64px; height: 64px; }
  .card.org .badge img { width: 44px; height: 44px; }
  .card.org::after { width: 260px; height: 260px; right: -80px; bottom: -90px; }
  .hero-rings { gap: 14px; }
  .hero-rings img.main { width: 120px; height: 120px; }
  .hero-rings img { width: 56px; height: 56px; }
}

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