/* Header, footer, page shell */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--header-h);
  border-bottom: 1px solid var(--color-border);
  background: var(--color-header-bg);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  transition: box-shadow 0.3s ease;
}

.site-header--scrolled {
  box-shadow: 0 2px 16px rgba(15, 23, 42, 0.1);
}

.site-header__inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 1.5rem;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.site-logo {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--color-text);
  letter-spacing: -0.01em;
}

.site-logo:hover {
  color: var(--color-text);
}

.site-logo__img {
  width: 2.55rem;
  height: 2.55rem;
  border-radius: 12px;
  object-fit: cover;
  background: #ffffff;
  box-shadow: 0 6px 18px rgba(18, 143, 196, 0.2);
}

.site-logo__sub {
  font-size: 0.7rem;
  color: var(--color-text-faint);
  font-weight: 500;
  margin-top: 2px;
  letter-spacing: 0.02em;
}

.site-logo__text {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.site-nav__link {
  padding: 0.5rem 0.85rem;
  border-radius: var(--radius-sm);
  color: var(--color-text-muted);
  font-weight: 500;
  font-size: 0.92rem;
  transition: background 0.15s, color 0.15s;
}

.site-nav__link:hover {
  color: var(--color-text);
  background: var(--color-ghost-fill);
}

.site-nav__link.is-active {
  color: var(--color-accent);
  background: var(--color-accent-dim);
}

.site-nav__cta {
  margin-left: 0.5rem;
}

.site-nav__toggle {
  display: none;
  width: 2.5rem;
  height: 2.5rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  color: var(--color-text);
  cursor: pointer;
  align-items: center;
  justify-content: center;
}

.site-nav__toggle-icon {
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.site-nav__toggle-icon span {
  display: block;
  width: 18px;
  height: 2px;
  background: currentColor;
  border-radius: 1px;
}

@media (max-width: 900px) {
  .site-nav__toggle {
    display: flex;
  }

  .site-nav {
    position: fixed;
    inset: var(--header-h) 0 auto 0;
    flex-direction: column;
    align-items: stretch;
    padding: 1rem;
    gap: 0.25rem;
    background: var(--color-bg-elevated);
    border-bottom: 1px solid var(--color-border);
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: transform 0.3s var(--ease-out), opacity 0.2s, visibility 0.3s;
  }

  body.nav-open .site-nav {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }

  .site-nav__cta {
    margin-left: 0;
    margin-top: 0.5rem;
  }
}

.site-main {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 2.5rem 1.5rem 4rem;
}

.site-main--narrow {
  max-width: 56rem;
}

.site-footer {
  border-top: 1px solid var(--color-border);
  background: var(--color-bg-elevated);
  padding: 3rem 1.5rem 2rem;
  margin-top: auto;
}

.site-footer__inner {
  max-width: var(--max-w);
  margin: 0 auto;
  display: grid;
  gap: 2.5rem;
  grid-template-columns: 1.4fr repeat(3, 1fr);
}

@media (max-width: 900px) {
  .site-footer__inner {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 600px) {
  .site-footer__inner {
    grid-template-columns: 1fr;
  }
}

.site-footer__title {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-faint);
  margin: 0 0 0.85rem;
  font-weight: 600;
}

.site-footer__links {
  list-style: none;
  margin: 0;
  padding: 0;
}

.site-footer__links li {
  margin-bottom: 0.5rem;
}

.site-footer__links a {
  color: var(--color-text-muted);
  font-size: 0.9rem;
}

.site-footer__links a:hover {
  color: var(--color-accent);
}

.site-footer__bottom {
  max-width: var(--max-w);
  margin: 2.5rem auto 0;
  padding-top: 1.5rem;
  border-top: 1px solid var(--color-border);
  font-size: 0.82rem;
  color: var(--color-text-faint);
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem 1.5rem;
  justify-content: center;
  align-items: center;
  text-align: center;
}

.site-footer__bottom a {
  color: var(--color-text-faint);
}

.site-footer__bottom a:hover {
  color: var(--color-text-muted);
}

body {
  display: flex;
  flex-direction: column;
  padding-top: var(--header-h);
}

#site-header,
#site-footer {
  flex-shrink: 0;
}

/* Page hero */
.page-hero {
  padding: 3.5rem 0 2.5rem;
}

.page-hero--compact {
  padding: 2rem 0 1.5rem;
}

.page-title {
  font-size: clamp(2rem, 4.2vw, 3rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.12;
  margin: 0 0 1rem;
}

.page-lead {
  font-size: 1.1rem;
  color: var(--color-text-muted);
  max-width: 44rem;
  margin: 0;
  line-height: 1.65;
}