.site-header {
      background: linear-gradient(180deg, #ffffff 0%, #fafbfc 100%);
      border-bottom: 1px solid rgba(15,23,42,0.08);
      box-shadow: 0 2px 8px rgba(0,0,0,0.02);
      position: sticky;
      top: 0;
      z-index: 1000;
      transition: all 0.3s ease;
    }
    .site-header.scrolled {
      box-shadow: 0 4px 16px rgba(0,0,0,0.06);
      border-bottom-color: rgba(15,23,42,0.12);
    }
    .site-header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 0.75rem 1rem;
      gap: 2rem;
    }
    .site-brand {
      display: flex;
      align-items: center;
      gap: 1rem;
    }
    .logo {
      display: flex;
      align-items: center;
      transition: transform 0.2s ease;
    }
    .logo:hover {
      transform: scale(1.05);
    }
    .logo-img {
      filter: drop-shadow(0 2px 4px rgba(11,102,255,0.15));
    }
    .nav-toggle {
      display: none;
      background: linear-gradient(135deg, var(--brand, #0b66ff), rgba(42,160,255,0.9));
      color: white;
      border: none;
      padding: 0.5rem 0.75rem;
      border-radius: 6px;
      font-size: 1.25rem;
      cursor: pointer;
      transition: all 0.2s ease;
    }
    .nav-toggle:hover {
      box-shadow: 0 4px 12px rgba(11,102,255,0.3);
      transform: translateY(-1px);
    }
    .site-nav {
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex: 1;
      gap: 2rem;
    }
    .nav-list {
      display: flex;
      align-items: center;
      gap: 1.5rem;
      list-style: none;
      margin: 0;
      padding: 0;
    }
    .nav-list li a {
      text-decoration: none;
      color: var(--text, #1e293b);
      font-weight: 500;
      padding: 0.5rem 0.75rem;
      border-radius: 6px;
      transition: all 0.2s ease;
      position: relative;
    }
    .nav-list li a::before {
      content: "";
      position: absolute;
      bottom: 0;
      left: 50%;
      transform: translateX(-50%) scaleX(0);
      width: 80%;
      height: 2px;
      background: linear-gradient(90deg, var(--brand, #0b66ff), rgba(42,160,255,0.8));
      transition: transform 0.3s ease;
    }
    .nav-list li a:hover::before {
      transform: translateX(-50%) scaleX(1);
    }
    .nav-list li a:hover {
      background: rgba(11,102,255,0.05);
      color: var(--brand, #0b66ff);
    }
    .has-submenu {
      position: relative;
    }
    .submenu-toggle {
      background: transparent;
      border: none;
      color: var(--text, #1e293b);
      font-weight: 500;
      padding: 0.5rem 0.75rem;
      border-radius: 6px;
      cursor: pointer;
      transition: all 0.2s ease;
      font-family: inherit;
      font-size: inherit;
    }
    .submenu-toggle:hover {
      background: rgba(11,102,255,0.05);
      color: var(--brand, #0b66ff);
    }
    .submenu {
      position: absolute;
      top: 100%;
      left: 0;
      background: white;
      border: 1px solid rgba(15,23,42,0.1);
      border-radius: 8px;
      box-shadow: 0 8px 24px rgba(0,0,0,0.12);
      list-style: none;
      margin: 0.5rem 0 0 0;
      padding: 0.5rem;
      min-width: 180px;
      opacity: 0;
      visibility: hidden;
      transform: translateY(-10px);
      transition: all 0.3s ease;
    }
    .submenu.open {
      opacity: 1;
      visibility: visible;
      transform: translateY(0);
    }
    .submenu li {
      margin: 0;
    }
    .submenu li a {
      display: block;
      padding: 0.65rem 0.75rem;
      color: var(--text, #1e293b);
      text-decoration: none;
      border-radius: 6px;
      transition: all 0.2s ease;
    }
    .submenu li a::before {
      display: none;
    }
    .submenu li a:hover {
      background: linear-gradient(135deg, rgba(11,102,255,0.08), rgba(42,160,255,0.08));
      color: var(--brand, #0b66ff);
      transform: translateX(4px);
    }
    .auth-list {
      display: flex;
      align-items: center;
      gap: 0.75rem;
      list-style: none;
      margin: 0;
      padding: 0;
    }
    .auth-list li {
      display: block !important;
    }
    .auth-list .auth-login {
      display: block !important;
    }
    .auth-list .auth-logout {
      display: block !important;
    }
    .auth-list .btn {
      text-decoration: none;
      padding: 0.6rem 1.25rem;
      border-radius: 8px;
      font-weight: 600;
      transition: all 0.2s ease;
      border: none;
      cursor: pointer;
      display: inline-block;
    }
    .auth-list .btn-primary {
      background: linear-gradient(135deg, var(--brand, #0b66ff), rgba(42,160,255,0.9));
      color: white;
      box-shadow: 0 2px 8px rgba(11,102,255,0.2);
    }
    .auth-list .btn-primary:hover {
      box-shadow: 0 4px 16px rgba(11,102,255,0.35);
      transform: translateY(-2px);
    }
    .auth-list .btn-ghost {
      background: transparent;
      color: var(--text, #1e293b);
      border: 1px solid rgba(15,23,42,0.15);
    }
    .auth-list .btn-ghost:hover {
      background: rgba(239,68,68,0.05);
      border-color: rgba(239,68,68,0.3);
      color: #ef4444;
    }
    
    @media (max-width: 968px) {
      .nav-toggle {
        display: block;
      }
      .site-nav {
        position: fixed;
        top: 65px;
        left: 0;
        right: 0;
        flex-direction: column;
        background: white;
        border-bottom: 1px solid rgba(15,23,42,0.1);
        box-shadow: 0 8px 24px rgba(0,0,0,0.12);
        padding: 1rem;
        gap: 1rem;
        opacity: 0;
        visibility: hidden;
        transform: translateY(-20px);
        transition: all 0.3s ease;
      }
      .site-nav.open {
        opacity: 1;
        visibility: visible;
        transform: translateY(0);
      }
      .nav-list {
        flex-direction: column;
        align-items: stretch;
        width: 100%;
      }
      .nav-list li {
        width: 100%;
      }
      .nav-list li a {
        display: block;
        width: 100%;
      }
      .auth-list {
        width: 100%;
        justify-content: stretch;
      }
      .auth-list li {
        flex: 1;
      }
      .auth-list .btn {
        width: 100%;
        text-align: center;
      }
      .submenu {
        position: static;
        box-shadow: none;
        border: none;
        margin-left: 1rem;
        background: rgba(11,102,255,0.02);
      }
    }