/* Ambient background mesh */
.gc-bg {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(circle at 85% 8%, rgba(79, 140, 255, 0.14), transparent 34%),
    radial-gradient(circle at 12% 88%, rgba(62, 207, 142, 0.07), transparent 30%),
    var(--bg-root);
}

.gc-bg::before {
  content: "";
  position: absolute;
  inset: 0;
  opacity: 0.35;
  background-image:
    linear-gradient(rgba(39, 50, 68, 0.35) 1px, transparent 1px),
    linear-gradient(90deg, rgba(39, 50, 68, 0.35) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse 80% 70% at 50% 40%, black 20%, transparent 75%);
}

.gc-shell {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.gc-main {
  flex: 1;
}

/* Header */
.gc-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: var(--header-height);
  padding: 0 clamp(20px, 4vw, 48px);
  border-bottom: 1px solid var(--border-soft);
  background: var(--bg-glass);
  backdrop-filter: blur(14px);
  transition: border-color var(--duration) var(--ease), box-shadow var(--duration) var(--ease);
}

.gc-header.is-scrolled {
  border-color: var(--border);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.25);
}

.gc-brand {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.gc-brand-kicker {
  color: var(--accent);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  font-weight: 600;
}

.gc-logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  font-weight: 700;
  font-size: 1.05rem;
  text-decoration: none;
}

.gc-logo:hover {
  text-decoration: none;
}

.gc-logo-mark {
  display: block;
  width: 24px;
  height: 24px;
  max-width: 24px;
  max-height: 24px;
  flex-shrink: 0;
}

.gc-nav-list {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 6px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.gc-nav-list a {
  display: inline-block;
  padding: 8px 12px;
  border-radius: 10px;
  border: 1px solid transparent;
  color: var(--text-muted);
  font-size: 0.92rem;
  font-weight: 500;
  text-decoration: none;
  transition: color var(--duration) var(--ease), background var(--duration) var(--ease), border-color var(--duration) var(--ease);
}

.gc-nav-list a:hover {
  color: var(--text);
  background: var(--bg-panel-hover);
  text-decoration: none;
}

.gc-nav-list a.is-active {
  color: var(--text);
  background: var(--accent-soft);
  border-color: var(--border-accent);
}

/* Sections */
.gc-section {
  padding: 64px clamp(20px, 4vw, 48px);
  max-width: var(--content-max);
  margin: 0 auto;
}

.gc-section--wide {
  max-width: none;
  padding-inline: clamp(20px, 4vw, 48px);
  background: rgba(18, 24, 33, 0.5);
  border-block: 1px solid var(--border-soft);
}

.gc-section--wide > .gc-section-inner {
  max-width: var(--content-max);
  margin-inline: auto;
}

.gc-section-head {
  margin-bottom: 8px;
}

.gc-section-head h2,
.gc-section-head h1 {
  margin: 0;
  font-size: clamp(1.6rem, 3vw, 2.2rem);
}

/* Footer */
.gc-footer {
  margin-top: auto;
  padding: 32px clamp(20px, 4vw, 48px) 40px;
  border-top: 1px solid var(--border-soft);
}

.gc-footer-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  max-width: var(--content-max);
  margin: 0 auto;
  color: var(--text-muted);
  font-size: 0.88rem;
}

.gc-footer-tagline {
  margin: 0;
  color: var(--text-muted);
}

.gc-footer-copy {
  margin: 0;
  color: var(--text-dim);
  font-size: 0.85rem;
}

@media (max-width: 900px) {
  .gc-header {
    flex-direction: column;
    align-items: flex-start;
    padding-block: 16px;
  }

  .gc-nav-list {
    width: 100%;
  }
}

@media (max-width: 640px) {
  .gc-section {
    padding-block: 48px;
  }
}