/* =========================================
   TAGNI LAYOUT — Header, Footer, Nav
   ========================================= */

/* ---- Header ---- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: color-mix(in oklch, var(--color-bg) 92%, transparent);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid transparent;
  transition:
    border-color var(--transition-smooth),
    box-shadow var(--transition-smooth),
    background var(--transition-smooth);
}

.site-header.scrolled {
  border-bottom-color: var(--color-divider);
  box-shadow: var(--shadow-sm);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
  max-width: var(--content-wide);
  margin-inline: auto;
  padding-inline: clamp(var(--space-4), 4vw, var(--space-12));
}

/* ---- Logo ---- */
.site-logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  color: var(--color-text);
  flex-shrink: 0;
}

.site-logo__mark {
  width: 36px;
  height: 36px;
  flex-shrink: 0;
}

.site-logo__name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.1rem, 1rem + 0.5vw, 1.35rem);
  letter-spacing: -0.01em;
  line-height: 1;
}

.site-logo__tagline {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  letter-spacing: 0.04em;
  font-family: var(--font-body);
  font-weight: 500;
  display: none;
}

@media (min-width: 1024px) {
  .site-logo__tagline { display: block; }
}

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

@media (max-width: 1079px) {
  .site-nav { display: none; }
}

.nav-link {
  display: inline-flex;
  align-items: center;
  padding: var(--space-2) var(--space-2);
  font-size: 0.8125rem;
  font-weight: 500;
  font-family: var(--font-body);
  color: var(--color-text-muted);
  border-radius: var(--radius-md);
  text-decoration: none;
  transition:
    color var(--transition-interactive),
    background var(--transition-interactive);
}

.nav-link:hover,
.nav-link.is-active {
  color: var(--color-text);
  background: var(--color-surface-offset);
}

.nav-link.is-active {
  font-weight: 600;
  color: var(--color-primary);
  background: var(--color-primary-light);
}

/* ---- Header actions ---- */
.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  color: var(--color-text-muted);
  background: transparent;
  border: none;
  cursor: pointer;
  transition: color var(--transition-interactive), background var(--transition-interactive);
}
.theme-toggle:hover { color: var(--color-text); background: var(--color-surface-offset); }

/* ---- Mobile nav toggle ---- */
.mobile-nav-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  color: var(--color-text);
  background: transparent;
  border: none;
  cursor: pointer;
  transition: background var(--transition-interactive);
}
.mobile-nav-toggle:hover { background: var(--color-surface-offset); }

@media (max-width: 1079px) {
  .mobile-nav-toggle { display: flex; }
  .header-cta { display: none; }
}

/* ---- Mobile nav drawer ---- */
.mobile-nav {
  display: none;
  position: fixed;
  inset: 68px 0 0 0;
  background: var(--color-bg);
  z-index: 99;
  padding: var(--space-6) clamp(var(--space-4), 4vw, var(--space-12));
  overflow-y: auto;
  flex-direction: column;
  gap: var(--space-1);
  border-top: 1px solid var(--color-divider);
}

.mobile-nav[data-open='true'] {
  display: flex;
}

.mobile-nav .nav-link {
  font-size: var(--text-base);
  padding: var(--space-4) var(--space-4);
  border-radius: var(--radius-lg);
}

.mobile-nav-cta {
  margin-top: var(--space-4);
  padding-top: var(--space-4);
  border-top: 1px solid var(--color-divider);
}

/* ---- Footer ---- */
.site-footer {
  background: var(--color-dark-bg);
  color: var(--color-dark-text);
  padding-block: clamp(var(--space-12), 6vw, var(--space-20));
}

.site-footer__inner {
  max-width: var(--content-wide);
  margin-inline: auto;
  padding-inline: clamp(var(--space-4), 4vw, var(--space-12));
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-12);
  margin-bottom: var(--space-12);
}

@media (max-width: 768px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-8);
  }
}

@media (max-width: 480px) {
  .footer-grid {
    grid-template-columns: 1fr;
  }
}

.footer-brand .site-logo {
  color: var(--color-dark-text);
  margin-bottom: var(--space-4);
}

.footer-brand p {
  font-size: var(--text-sm);
  color: var(--color-dark-muted);
  line-height: 1.7;
  max-width: 30ch;
}

.footer-col h4 {
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-dark-muted);
  margin-bottom: var(--space-4);
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.footer-links a {
  font-size: var(--text-sm);
  color: var(--color-dark-muted);
  text-decoration: none;
  transition: color var(--transition-interactive);
}
.footer-links a:hover { color: var(--color-dark-text); }

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-4);
  padding-top: var(--space-8);
  border-top: 1px solid color-mix(in oklch, var(--color-dark-text) 12%, transparent);
}

.footer-bottom p {
  font-size: var(--text-xs);
  color: var(--color-dark-muted);
  max-width: none;
}

.footer-accent-mark {
  display: flex;
  gap: var(--space-1);
  margin-bottom: var(--space-6);
}
.footer-accent-mark span {
  display: block;
  height: 2px;
  border-radius: 2px;
}
.footer-accent-mark span:first-child { width: 20px; background: var(--color-primary); opacity: 0.7; }
.footer-accent-mark span:last-child  { width: 12px; background: var(--color-accent);  opacity: 0.7; }

/* ---- Page header / hero ---- */
.page-hero {
  padding-block: clamp(var(--space-16), 10vw, var(--space-32));
  position: relative;
  overflow: hidden;
}

/* ---- Section headers ---- */
.section-header {
  margin-bottom: clamp(var(--space-10), 5vw, var(--space-16));
}

.section-header--center {
  text-align: center;
}

.section-header--center p {
  max-width: 60ch;
  margin-inline: auto;
}

/* ---- Scroll animations ---- */
[data-animate] {
  opacity: 0;
  transform: translateY(20px);
  transition:
    opacity 0.6s cubic-bezier(0.16, 1, 0.3, 1),
    transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}
[data-animate].is-visible {
  opacity: 1;
  transform: translateY(0);
}
[data-animate-delay='1'] { transition-delay: 0.1s; }
[data-animate-delay='2'] { transition-delay: 0.2s; }
[data-animate-delay='3'] { transition-delay: 0.3s; }
[data-animate-delay='4'] { transition-delay: 0.4s; }