.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition), box-shadow var(--transition);
}

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

.nav {
  min-height: var(--header-height);
  height: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: clamp(12px, 2vw, 24px);
  padding: 12px 0;
  flex-wrap: nowrap;
}

.nav__brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--color-text);
}

.nav__brand-logo {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: var(--gradient-accent);
  display: grid;
  place-items: center;
  color: #fff;
  font-weight: 800;
  font-size: 1rem;
  letter-spacing: -0.5px;
}

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

.nav__link {
  position: relative;
  padding: 10px 14px;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--color-text-soft);
  border-radius: var(--radius-sm);
  transition: color var(--transition), background var(--transition);
}

.nav__link:hover {
  color: var(--color-primary);
}

.nav__link.is-active {
  color: var(--color-primary);
  font-weight: 600;
}

.nav__link.is-active::after {
  content: "";
  position: absolute;
  left: 14px;
  right: 14px;
  bottom: 4px;
  height: 2px;
  border-radius: 2px;
  background: var(--gradient-accent);
}

.nav__actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.lang-switch {
  display: inline-flex;
  align-items: center;
  background: var(--color-bg-soft);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  padding: 4px;
  font-size: 0.85rem;
}

.lang-switch__btn {
  padding: 6px 14px;
  border-radius: var(--radius-pill);
  color: var(--color-text-soft);
  font-weight: 600;
  transition: all var(--transition);
}

.lang-switch__btn.is-active {
  background: var(--color-primary);
  color: var(--color-white);
  box-shadow: var(--shadow-sm);
}

.nav__toggle {
  display: none;
  width: 40px;
  height: 40px;
  border-radius: 8px;
  align-items: center;
  justify-content: center;
  color: var(--color-text);
}

.nav__toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: currentColor;
  border-radius: 2px;
  position: relative;
  transition: transform var(--transition), opacity var(--transition);
}

.nav__toggle span::before,
.nav__toggle span::after {
  content: "";
  position: absolute;
  left: 0;
  width: 100%;
  height: 100%;
  background: currentColor;
  border-radius: 2px;
  transition: transform var(--transition);
}

.nav__toggle span::before { top: -7px; }
.nav__toggle span::after  { top:  7px; }

.nav__toggle.is-open span { background: transparent; }
.nav__toggle.is-open span::before { transform: translateY(7px) rotate(45deg); }
.nav__toggle.is-open span::after  { transform: translateY(-7px) rotate(-45deg); }

@media (max-width: 960px) {
  .nav__toggle { display: inline-flex; }
  .nav__menu {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 12px var(--container-padding) 20px;
    background: var(--color-white);
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-md);
    transform: translateY(-12px);
    opacity: 0;
    pointer-events: none;
    transition: transform var(--transition), opacity var(--transition);
  }
  .nav__menu.is-open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }
  .nav__link {
    padding: 14px 12px;
    border-radius: var(--radius-sm);
  }
  .nav__link.is-active::after { display: none; }
  .nav__link.is-active { background: rgba(11, 92, 255, 0.08); }
  .nav__actions .btn--primary { display: none; }
}

.site-footer {
  background: var(--color-bg-dark);
  color: rgba(255, 255, 255, 0.7);
  padding: clamp(48px, 6vw, 72px) 0 24px;
}

.footer__grid {
  display: grid;
  grid-template-columns: 1.5fr repeat(3, minmax(0, 1fr));
  gap: clamp(24px, 4vw, 48px);
  margin-bottom: 48px;
}

.footer__brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: clamp(1.05rem, 1rem + 0.5vw, 1.2rem);
  font-weight: 700;
  color: #fff;
  margin-bottom: 16px;
}

.footer__about {
  max-width: 320px;
  line-height: 1.7;
}

.footer__title {
  color: #fff;
  font-size: clamp(0.85rem, 0.8rem + 0.2vw, 0.95rem);
  font-weight: 600;
  margin-bottom: 16px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.footer__list li {
  margin-bottom: 10px;
}

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

.footer__contact-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.footer__contact-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.92rem;
}

.footer__contact-icon {
  flex-shrink: 0;
  width: 34px;
  height: 34px;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.08);
  display: grid;
  place-items: center;
  color: var(--color-accent);
}

.footer__contact-icon svg {
  width: 16px;
  height: 16px;
}

.footer__contact-text {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
  flex: 1;
}

.footer__contact-title {
  font-size: 0.95rem;
  color: #fff;
  font-weight: 600;
  letter-spacing: 0.01em;
}

.footer__contact-subtitle {
  font-size: 0.75rem;
  color: rgba(255, 255, 255, 0.5);
  font-weight: 500;
  letter-spacing: 0.02em;
  margin-top: 1px;
}

.footer__contact-value {
  color: rgba(255, 255, 255, 0.85);
  text-decoration: none;
  word-break: break-word;
  transition: color var(--transition);
  font-size: 0.85rem;
  margin-top: 2px;
}

.footer__contact-value:hover {
  color: var(--color-accent);
}

.footer__bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding-top: 24px;
  text-align: center;
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.5);
}

@media (max-width: 1024px) {
  .footer__grid {
    grid-template-columns: 1fr 1fr 1fr;
  }
  .footer__about { max-width: 100%; grid-column: 1 / -1; }
}

@media (max-width: 720px) {
  .footer__grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px 24px;
  }
  .footer__about { grid-column: 1 / -1; }
}

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