/* ============================================
   Header & Navigation
   ============================================ */

.header {
  position: sticky;
  top: 0;
  z-index: var(--z-nav);
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border-light);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  transition: all var(--transition-normal);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--nav-height);
}

/* Logo */
.header__logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-weight: 700;
  font-size: var(--font-size-lg);
  letter-spacing: -0.02em;
  flex-shrink: 0;
}

.header__logo-icon {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  background: var(--gradient-hero);
  display: flex;
  align-items: center;
  justify-content: center;
}

.header__logo-icon svg {
  width: 18px;
  height: 18px;
  fill: #fff;
}

/* Desktop Nav */
.nav {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.nav__link {
  display: flex;
  align-items: center;
  padding: var(--space-sm) var(--space-md);
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-text-secondary);
  border-radius: var(--radius-full);
  transition: all var(--transition-fast);
  position: relative;
}

.nav__link:hover,
.nav__link--active {
  color: var(--color-text-primary);
  background: var(--color-bg-secondary);
}

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

/* Mobile menu button */
.menu-toggle {
  display: none;
  width: 40px;
  height: 40px;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  transition: background var(--transition-fast);
}

.menu-toggle:hover {
  background: var(--color-bg-secondary);
}

.menu-toggle__icon {
  width: 20px;
  height: 20px;
  position: relative;
}

.menu-toggle__icon span {
  display: block;
  position: absolute;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--color-text-primary);
  border-radius: 1px;
  transition: all var(--transition-fast);
}

.menu-toggle__icon span:nth-child(1) { top: 4px; }
.menu-toggle__icon span:nth-child(2) { top: 10px; }
.menu-toggle__icon span:nth-child(3) { top: 16px; }

/* Menu open state */
.menu-toggle--open .menu-toggle__icon span:nth-child(1) {
  top: 10px;
  transform: rotate(45deg);
}

.menu-toggle--open .menu-toggle__icon span:nth-child(2) {
  opacity: 0;
}

.menu-toggle--open .menu-toggle__icon span:nth-child(3) {
  top: 10px;
  transform: rotate(-45deg);
}

/* Mobile nav overlay */
.mobile-nav {
  display: none;
  position: fixed;
  top: var(--nav-height);
  left: 0;
  right: 0;
  bottom: 0;
  z-index: var(--z-overlay);
  background: var(--color-bg);
  padding: var(--space-lg);
  animation: fadeIn 0.2s ease;
}

.mobile-nav--open {
  display: block;
}

.mobile-nav__list {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.mobile-nav__link {
  display: flex;
  align-items: center;
  padding: var(--space-md) var(--space-lg);
  font-size: var(--font-size-lg);
  font-weight: 500;
  color: var(--color-text-secondary);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.mobile-nav__link:hover,
.mobile-nav__link--active {
  color: var(--color-text-primary);
  background: var(--color-bg-secondary);
}

/* Responsive */
@media (max-width: 768px) {
  .nav {
    display: none;
  }

  .menu-toggle {
    display: flex;
  }
}

/* ============================================
   Footer
   ============================================ */

.footer {
  background: var(--color-bg-secondary);
  border-top: 1px solid var(--color-border-light);
  padding: var(--space-3xl) 0 var(--space-xl);
  margin-top: auto;
}

.footer__grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: var(--space-3xl);
  margin-bottom: var(--space-3xl);
}

.footer__brand p {
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
  line-height: var(--line-height-relaxed);
  margin-top: var(--space-md);
  max-width: 320px;
}

.footer__heading {
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: var(--space-md);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.footer__links {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.footer__link {
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
  transition: color var(--transition-fast);
}

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

.footer__bottom {
  border-top: 1px solid var(--color-border-light);
  padding-top: var(--space-lg);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-md);
}

.footer__copyright {
  color: var(--color-text-tertiary);
  font-size: var(--font-size-xs);
}

.footer__icp {
  color: var(--color-text-tertiary);
  font-size: var(--font-size-xs);
}

@media (max-width: 768px) {
  .footer__grid {
    grid-template-columns: 1fr;
    gap: var(--space-2xl);
  }

  .footer__bottom {
    flex-direction: column;
    text-align: center;
  }
}