/* ── Header / Navbar ── */

.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(10, 10, 15, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--color-border);
  transition: box-shadow var(--transition);
}

.site-header.scrolled {
  box-shadow: 0 4px 32px rgba(0,0,0,0.6);
}

.navbar {
  display: flex;
  align-items: center;
  gap: var(--space-6);
  padding: 0 var(--space-6);
  height: 64px;
  max-width: var(--max-width);
  margin: 0 auto;
}

/* Logo */
.navbar-logo a {
  font-size: var(--text-xl);
  font-weight: 800;
  letter-spacing: -0.03em;
  background: linear-gradient(135deg, var(--color-text), var(--color-primary-l));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  display: flex;
  align-items: center;
  gap: var(--space-2);
  white-space: nowrap;
}

.logo-icon {
  width: 28px;
  height: 28px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  border-radius: 7px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  -webkit-text-fill-color: initial;
  color: #fff;
  flex-shrink: 0;
}

/* Search */
.navbar-search {
  flex: 1;
  max-width: 520px;
  position: relative;
}

.navbar-search input {
  width: 100%;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  padding: var(--space-2) var(--space-5);
  padding-left: 2.5rem;
  color: var(--color-text);
  font-size: var(--text-sm);
  transition: border-color var(--transition), box-shadow var(--transition);
}

.navbar-search input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(108,99,255,0.12);
}

.navbar-search input::placeholder { color: var(--color-text-3); }

.search-icon {
  position: absolute;
  left: 0.85rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--color-text-3);
  font-size: 0.9rem;
  pointer-events: none;
}

.search-btn {
  position: absolute;
  right: 4px;
  top: 50%;
  transform: translateY(-50%);
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-d));
  color: #fff;
  border: none;
  border-radius: var(--radius-full);
  padding: var(--space-1) var(--space-4);
  font-size: var(--text-xs);
  font-weight: 600;
  cursor: pointer;
  transition: opacity var(--transition);
}

.search-btn:hover { opacity: 0.85; }

/* Nav links */
.navbar-actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-left: auto;
}

.nav-link {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius);
  color: var(--color-text-2);
  font-size: var(--text-xs);
  font-weight: 500;
  transition: color var(--transition), background var(--transition);
  text-decoration: none;
  position: relative;
}

.nav-link:hover {
  color: var(--color-text);
  background: var(--color-surface-2);
}

.nav-link-icon {
  font-size: 1.1rem;
  line-height: 1;
}

.nav-badge {
  position: absolute;
  top: 4px;
  right: 4px;
  background: var(--color-primary);
  color: #fff;
  font-size: 9px;
  font-weight: 700;
  min-width: 16px;
  height: 16px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 4px;
  border: 2px solid var(--color-bg);
}

/* Login button */
.login-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-d));
  color: #fff;
  border-radius: var(--radius);
  font-size: var(--text-sm);
  font-weight: 600;
  transition: all var(--transition);
  box-shadow: 0 2px 12px rgba(108,99,255,0.25);
  white-space: nowrap;
}

.login-btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 20px rgba(108,99,255,0.4);
}

/* Hamburger */
.nav-hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  padding: var(--space-2);
  cursor: pointer;
  margin-left: auto;
}

.nav-hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-text-2);
  border-radius: 2px;
  transition: all var(--transition);
}

/* Mobile menu */
.mobile-menu {
  display: none;
  flex-direction: column;
  gap: var(--space-2);
  padding: var(--space-4) var(--space-6);
  border-top: 1px solid var(--color-border);
  background: var(--color-surface);
}

.mobile-menu a {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius);
  color: var(--color-text-2);
  font-size: var(--text-sm);
  font-weight: 500;
  transition: all var(--transition);
}

.mobile-menu a:hover {
  color: var(--color-text);
  background: var(--color-surface-2);
}

.mobile-menu .mobile-search {
  display: flex;
  gap: var(--space-2);
  margin-bottom: var(--space-2);
}

.mobile-menu .mobile-search input {
  flex: 1;
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--space-3) var(--space-4);
  color: var(--color-text);
  font-size: var(--text-sm);
}

.mobile-menu .mobile-search input:focus {
  outline: none;
  border-color: var(--color-primary);
}

/* Responsive */
@media (max-width: 900px) {
  .navbar-search { max-width: 280px; }
}

@media (max-width: 768px) {
  .navbar {
    padding: 0 var(--space-4);
    height: 56px;
    flex-wrap: wrap;
    gap: var(--space-3);
  }

  .navbar-search,
  .navbar-actions,
  .login-btn {
    display: none;
  }

  .nav-hamburger {
    display: flex;
  }

  .mobile-menu.open {
    display: flex;
  }
}