/* ============================================================
   Layout — navbar, footer, section wrappers
   ============================================================ */

/* ── Section wrappers ───────────────────────────────────────── */
.section {
  padding: 100px 0;
  border-top: 1px solid var(--border);
}

.section-alt {
  background: var(--bg-surface);
}

.section-header {
  text-align: center;
  margin-bottom: 64px;
}

.section-header .section-label { margin-bottom: 16px; }
.section-header h2              { margin-bottom: 14px; }
.section-header .section-sub    {
  font-size: 1.05rem;
  color: var(--txt-2);
  max-width: 560px;
  margin: 0 auto;
}

.section-cta {
  text-align: center;
  margin-top: 48px;
}

/* ── Navbar ─────────────────────────────────────────────────── */
.navbar {
  position: fixed;
  top: 0;
  inset-inline: 0;
  z-index: 1000;
  padding: 22px 0;
  transition: background var(--t-base), padding var(--t-base), border-color var(--t-base);
  border-bottom: 1px solid transparent;
}

.navbar.scrolled {
  background: rgba(9, 9, 11, 0.88);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom-color: var(--border);
  padding: 14px 0;
}

[data-theme="light"] .navbar.scrolled {
  background: rgba(250, 249, 244, 0.92);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

/* Logo */
.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
  font-size: 1rem;
  flex-shrink: 0;
}

.logo-mark {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: var(--r-sm);
  background: var(--accent);
  color: #fff;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
}

/* Nav links */
.nav-links {
  display: flex;
  align-items: center;
  gap: 2px;
}

.nav-link {
  padding: 7px 13px;
  border-radius: var(--r-sm);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--txt-3);
  transition: color var(--t-fast), background var(--t-fast);
}

.nav-link:hover, .nav-link.active { color: var(--txt); }

.nav-cta {
  background: var(--accent);
  color: #fff !important;
  padding: 7px 18px;
  font-weight: 600;
  margin-left: 4px;
}

.nav-cta:hover { background: var(--accent-deep) !important; color: #fff !important; }

/* Theme toggle */
.theme-toggle {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: var(--r-sm);
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--txt-3);
  font-size: 0.85rem;
  flex-shrink: 0;
  transition: color var(--t-fast), border-color var(--t-fast), background var(--t-fast), transform var(--t-fast);
}

.theme-toggle:hover {
  color: var(--txt);
  border-color: var(--border-hv);
  background: var(--bg-card-hv);
  transform: rotate(12deg);
}

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  padding: 4px;
}

.hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--txt);
  border-radius: 2px;
  transition: transform var(--t-base), opacity var(--t-fast);
}

.hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ── Footer ─────────────────────────────────────────────────── */
.footer {
  border-top: 1px solid var(--border);
  background: var(--bg-surface);
}

.footer-main {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 32px;
  padding: 48px 24px;
  max-width: 1180px;
  margin: 0 auto;
}

.footer-brand .nav-logo { margin-bottom: 6px; }
.footer-brand p { font-size: 0.82rem; color: var(--txt-3); }

.footer-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
}

.footer-nav a {
  padding: 6px 12px;
  font-size: 0.875rem;
  color: var(--txt-3);
  border-radius: var(--r-sm);
  transition: color var(--t-fast);
}

.footer-nav a:hover { color: var(--txt); }

.footer-social {
  display: flex;
  align-items: center;
  gap: 8px;
}

.footer-social a {
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  border-radius: var(--r-sm);
  background: var(--bg-card);
  border: 1px solid var(--border);
  font-size: 1rem;
  color: var(--txt-3);
  transition: color var(--t-fast), border-color var(--t-fast), background var(--t-fast);
}

.footer-social a:hover {
  color: var(--txt);
  border-color: var(--border-hv);
  background: var(--bg-card-hv);
}

.footer-bottom {
  border-top: 1px solid var(--border);
}

.footer-bottom-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1180px;
  margin: 0 auto;
  padding: 16px 24px;
}

.footer-bottom p { font-size: 0.78rem; color: var(--txt-3); }

.back-to-top {
  display: grid;
  place-items: center;
  width: 32px;
  height: 32px;
  border-radius: var(--r-sm);
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--txt-3);
  font-size: 0.78rem;
  transition: color var(--t-fast), border-color var(--t-fast);
}

.back-to-top:hover { color: var(--txt); border-color: var(--border-hv); }

/* ── Responsive ─────────────────────────────────────────────── */
@media (max-width: 768px) {
  .section { padding: 72px 0; }

  .hamburger { display: flex; }

  .nav-links {
    display: none;
    position: fixed;
    top: 62px;
    inset-inline: 0;
    flex-direction: column;
    background: rgba(9,9,11,.97);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    padding: 12px 12px 16px;
    gap: 2px;
    z-index: 999;
  }
  .nav-links.open { display: flex; }
  .nav-link       { padding: 11px 16px; width: 100%; }
  .nav-cta        { text-align: center; margin: 4px 0 0; }

  .footer-main        { flex-direction: column; align-items: flex-start; }
  .footer-bottom-inner { flex-direction: column; gap: 12px; text-align: center; }
}