/* =====================================================================
   LAYOUT — header, page structure, footer
   ===================================================================== */

/* ---- Header ---- */
.topbar {
  position: relative;
  background: var(--ocean-900);
  color: var(--sand);
  padding: 42px 32px 120px;
  overflow: hidden;
}

/* wave divider */
.topbar .wave {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  display: block;
  line-height: 0;
}
.topbar .wave svg {
  width: 100%;
  height: 70px;
  display: block;
}

.gh-link {
  position: absolute;
  top: 22px;
  right: 24px;
  z-index: 3;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 7px 13px;
  border: 1px solid rgba(255, 255, 255, .35);
  border-radius: var(--r);
  color: #fff;
  text-decoration: none;
  font-size: .82rem;
  font-weight: 600;
  letter-spacing: .01em;
  transition: background .2s, border-color .2s;
}
.gh-link:hover {
  background: rgba(255, 255, 255, .14);
  border-color: rgba(255, 255, 255, .6);
}

.brand {
  position: relative;
  display: flex;
  align-items: center;
  gap: 14px;
  max-width: 1140px;
  margin: 0 auto;
}
.brand h1 {
  font-family: var(--serif);
  font-weight: 700;
  font-size: clamp(1.4rem, 2.4vw, 1.95rem);
  letter-spacing: .2px;
  color: #fff;
}
.brand .sub {
  font-size: .78rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--lagoon-soft);
  font-weight: 600;
  margin-top: 2px;
}
.tagline {
  position: relative;
  max-width: 540px;
  margin: 18px auto 0;
  font-size: .95rem;
  color: rgba(255, 255, 255, .82);
}

/* ---- Page ---- */
.wrap {
  max-width: 1140px;
  margin: -78px auto 60px;
  padding: 0 24px;
  position: relative;
  z-index: 2;
}
.grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.15fr);
  gap: 24px;
  align-items: start;
}

/* ---- Footer ---- */
footer {
  text-align: center;
  color: var(--muted);
  font-size: .76rem;
  padding: 10px 24px 50px;
  max-width: 1140px;
  margin: 0 auto;
}
footer a {
  color: var(--ocean-700);
}
footer .updated {
  display: inline-block;
  margin-top: 6px;
  font-weight: 600;
  color: var(--ink);
}

/* ---- Responsive ---- */
@media (max-width: 900px) {
  .grid {
    grid-template-columns: 1fr;
  }
}
@media (max-width: 520px) {
  .topbar {
    padding: 34px 22px 110px;
  }
  .gh-link {
    top: 16px;
    right: 16px;
    padding: 8px;
  }
  .gh-link span {
    display: none;
  }
  .wrap {
    padding: 0 16px;
    margin-bottom: 48px;
  }
  .brand h1 {
    padding-right: 48px; /* avoid overlap with the GitHub icon */
  }
}