/* ============================================================
   LAYOUT — Header, Nav, Footer, Grid — Baza Zemlya
   ============================================================ */

/* ── HEADER ── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-height);
  display: flex;
  align-items: center;
  background: color-mix(in oklab, var(--color-surface) 90%, transparent);
  backdrop-filter: blur(16px) saturate(1.4);
  -webkit-backdrop-filter: blur(16px) saturate(1.4);
  border-bottom: 1px solid var(--color-divider);
  transition: box-shadow var(--transition-interactive), background var(--transition-slow);
}
.site-header--scrolled {
  box-shadow: var(--shadow-sm);
  background: color-mix(in oklab, var(--color-surface) 97%, transparent);
}
.site-header--hero {
  position: absolute;
  width: 100%;
  background: transparent;
  border-bottom: 1px solid rgba(255,255,255,0.12);
}
.site-header--hero.site-header--scrolled {
  position: sticky;
  background: color-mix(in oklab, var(--color-surface) 94%, transparent);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-8);
  width: 100%;
  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;
  flex-shrink: 0;
}
.site-logo__mark {
  width: 40px;
  height: 40px;
  flex-shrink: 0;
}
.site-logo__text {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}
.site-logo__name {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--color-text);
  letter-spacing: -0.01em;
}
.site-logo__tagline {
  font-family: var(--font-body);
  font-size: 0.65rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-text-muted);
}

/* Nav */
.site-nav {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}
.site-nav__link {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  transition: color var(--transition-interactive), background var(--transition-interactive);
  white-space: nowrap;
}
.site-nav__link:hover,
.site-nav__link.active {
  color: var(--color-primary);
  background: var(--color-primary-highlight);
}

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

/* Theme toggle */
.theme-toggle {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-muted);
  background: var(--color-surface-offset);
  border: 1px solid var(--color-border);
  transition: all var(--transition-interactive);
}
.theme-toggle:hover {
  color: var(--color-text);
  background: var(--color-surface-offset-2);
}

/* Mobile burger */
.burger {
  display: none;
  width: 36px;
  height: 36px;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  border-radius: var(--radius-md);
  background: var(--color-surface-offset);
  border: 1px solid var(--color-border);
  cursor: pointer;
}
.burger span {
  width: 18px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: all var(--transition-interactive);
}
/* поддержка обоих классов: .open и aria-expanded */
.burger.open span:nth-child(1),
.burger[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.burger.open span:nth-child(2),
.burger[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.burger.open span:nth-child(3),
.burger[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* Mobile nav — slide-in справа (используется header.php)
   НЕ используем display:none/flex — только transform */
.bz-mnav {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  width: min(320px, 90vw);
  z-index: 200;
  background: var(--color-surface);
  padding: var(--space-6) var(--space-5);
  flex-direction: column;
  gap: var(--space-2);
  overflow-y: auto;
  transform: translateX(100%);
  transition: transform 0.3s cubic-bezier(0.4,0,0.2,1);
  /* display всегда flex, скрыто через transform */
  display: flex;
}
.bz-mnav.is-open,
.bz-mnav.open { transform: translateX(0); }

.bz-mnav__overlay {
  position: fixed;
  inset: 0;
  z-index: 199;
  background: rgba(0,0,0,0.5);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}
.bz-mnav__overlay.is-open {
  opacity: 1;
  pointer-events: auto;
}

.bz-mnav__link {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 500;
  color: var(--color-text);
  padding: var(--space-4) 0;
  border-bottom: 1px solid var(--color-divider);
  transition: color var(--transition-interactive);
  text-decoration: none;
}
.bz-mnav__link:hover { color: var(--color-primary); }

/* ── FOOTER ── */
.site-footer {
  background: var(--gradient-hero);
  color: rgba(255,255,255,0.85);
  padding-top: clamp(var(--space-16), 8vw, var(--space-32));
  padding-bottom: var(--space-8);
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-12);
  padding-bottom: var(--space-12);
  border-bottom: 1px solid rgba(255,255,255,0.12);
}
.footer-brand__logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
}
.footer-brand__name {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 600;
  color: #fff;
}
.footer-brand__desc {
  font-size: var(--text-sm);
  color: rgba(255,255,255,0.6);
  line-height: 1.7;
  margin-bottom: var(--space-6);
  max-width: 32ch;
}
.footer-social {
  display: flex;
  gap: var(--space-3);
}
.footer-social__link {
  width: 38px;
  height: 38px;
  border-radius: var(--radius-full);
  border: 1px solid rgba(255,255,255,0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(255,255,255,0.7);
  transition: all var(--transition-interactive);
}
.footer-social__link:hover {
  background: rgba(255,255,255,0.12);
  border-color: rgba(255,255,255,0.4);
  color: #fff;
}
.footer-col__title {
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.5);
  margin-bottom: var(--space-4);
}
.footer-col__links {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}
.footer-col__link {
  font-size: var(--text-sm);
  color: rgba(255,255,255,0.7);
  transition: color var(--transition-interactive);
}
.footer-col__link:hover { color: #fff; }
.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: var(--space-6);
  font-size: var(--text-xs);
  color: rgba(255,255,255,0.4);
}

/* ── SECTION ── */
.section {
  padding-block: clamp(var(--space-12), 8vw, var(--space-24));
}
.section--alt { background: var(--color-surface-offset); }
.section--dark {
  background: var(--gradient-hero);
  color: #fff;
}
.section-header {
  text-align: center;
  margin-bottom: clamp(var(--space-8), 4vw, var(--space-16));
}

/* ── CARD ── */
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  overflow: hidden;
  transition: all var(--transition-interactive);
}
.card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
  border-color: var(--color-primary-highlight);
}

/* ── GRID UTILITIES ── */
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--space-6); }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-6); }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-6); }
.grid-auto { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: var(--space-6); }

@media (max-width: 1024px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .grid-4      { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
  .burger       { display: flex; }
  .site-nav     { display: none; }
  .footer-grid  { grid-template-columns: 1fr 1fr; gap: var(--space-8); }
  .grid-2,
  .grid-3,
  .grid-4       { grid-template-columns: 1fr; }
  .grid-auto    { grid-template-columns: 1fr; }
}
@media (max-width: 480px) {
  .footer-grid  { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; gap: var(--space-2); text-align: center; }
}