/* --- Header Styles --- */
.site-header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: var(--bg-glass);
    border-bottom: 1px solid var(--border-color);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
}
.header-inner {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 24px;
    height: 64px;
    display: flex;
    align-items: center;
    gap: 32px;
}
.site-logo {
    font-size: 22px;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary-light), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.5px;
    flex-shrink: 0;
}
.main-nav {
    display: flex;
    align-items: center;
    gap: 4px;
    flex: 1;
}
.nav-link {
    padding: 8px 12px;
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
    transition: var(--transition);
    position: relative;
    white-space: nowrap;
    flex-shrink: 0;
}
.nav-link:hover, .nav-link.active {
    color: var(--text-primary);
    background: rgba(99, 102, 241, 0.1);
}
.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 50%;
    transform: translateX(-50%);
    width: 20px;
    height: 2px;
    background: var(--primary);
    border-radius: 1px;
}
.header-actions {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-shrink: 0;
}
.search-box {
    position: relative;
    display: flex;
    align-items: center;
}
.search-box input {
    width: 200px;
    padding: 8px 16px 8px 36px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    color: var(--text-primary);
    font-size: 13px;
    transition: var(--transition);
    outline: none;
}
.search-box input:focus {
    border-color: var(--primary);
    width: 260px;
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2);
}
.search-box input::placeholder { color: var(--text-muted); }
.search-box .search-icon {
    position: absolute;
    left: 12px;
    color: var(--text-muted);
    font-size: 14px;
}
.user-menu {
    position: relative;
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    padding: 4px;
    border-radius: var(--radius-sm);
    transition: var(--transition);
}
.user-menu:hover { background: var(--bg-secondary); }
.user-avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    object-fit: cover;
    border: 2px solid var(--border-color);
    transition: var(--transition);
}
.user-menu:hover .user-avatar { border-color: var(--primary); }
.user-name {
    font-size: 13px;
    font-weight: 500;
    color: var(--text-primary);
    max-width: 80px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}
.dropdown-menu {
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    min-width: 180px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: var(--transition);
    z-index: 100;
}
.user-menu:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}
.dropdown-menu a {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 16px;
    font-size: 13px;
    color: var(--text-secondary);
    transition: var(--transition);
}
.dropdown-menu a:hover {
    background: rgba(99, 102, 241, 0.1);
    color: var(--text-primary);
}
.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 20px;
    cursor: pointer;
    padding: 8px;
}

@media (max-width: 768px) {
    .main-nav { display: none; }
    .search-box { display: none; }
    .mobile-menu-btn { display: block; }
    .header-inner { gap: 16px; }
}