/* 헤더 전체 스타일 */
.cosmic-header {

    /* 헤더 컨테이너 */
    .header-container {
        max-width: 1200px;
        margin: 0 auto;
        padding: 0 20px;
        display: flex;
        justify-content: space-between;
        align-items: center;
    }

    /* 로고 스타일 */
    .logo {
        font-size: 24px;
        font-weight: bold;
        text-decoration: none;
        color: white;
        transition: color 0.3s ease;
    }

    .logo:hover {
        color: #3498db;
    }

    /* 메인 네비게이션 */
    .main-nav {
        flex: 1;
        margin-left: 30px;
    }

    /* 네비게이션 메뉴 */
    .nav-menu {
        display: flex;
        gap: 20px;
        list-style: none;
        margin: 0;
        padding: 0;
    }

    .nav-menu a {
        color: white;
        text-decoration: none;
        padding: 8px 16px;
        border-radius: 4px;
        transition: all 0.3s ease;
        font-weight: 500;
    }

    .nav-menu a:hover {
        background: rgba(255, 255, 255, 0.1);
        color: #fff;
    }

    .nav-menu a:active {
        background: rgba(255, 255, 255, 0.2);
    }

    /* 현재 페이지 표시 */
    .nav-menu a.active {
        background: #3498db;
        box-shadow: 0 2px 4px rgba(52, 152, 219, 0.3);
    }

    /* 사용자 정보 영역 */
    .user-info {
        display: flex;
        gap: 15px;
        align-items: center;
    }

    .user-info .username {
        font-weight: 500;
        font-size: 14px;
    }

    /* 버튼 스타일 */
    .btn {
        background: #3498db;
        color: white;
        padding: 8px 16px;
        border: none;
        border-radius: 4px;
        text-decoration: none;
        transition: all 0.3s ease;
        font-weight: 500;
        cursor: pointer;
    }

    .btn:hover {
        background: #2980b9;
        transform: translateY(-1px);
    }

    .btn.secondary {
        background: #95a5a6;
    }

    .btn.secondary:hover {
        background: #7f8c8d;
        transform: translateY(-1px);
    }

    .btn.danger {
        background: #e74c3c;
    }

    .btn.danger:hover {
        background: #c0392b;
    }

    /* 메인 콘텐츠 */
    .main-content {
        min-height: calc(100vh - 140px);
        padding: 20px 0;
    }

    /* 반응형 디자인 */
    @media (max-width: 1024px) {
        .header-container {
            padding: 0 15px;
        }

        .nav-menu {
            gap: 15px;
        }
    }

    @media (max-width: 768px) {
        .header-container {
            flex-direction: column;
            gap: 15px;
            padding: 0 10px;
        }

        .main-nav {
            margin-left: 0;
            order: 3;
            width: 100%;
        }

        .nav-menu {
            flex-wrap: wrap;
            justify-content: center;
            gap: 10px;
        }

        .user-info {
            flex-direction: column;
            gap: 10px;
            align-items: center;
            order: 2;
        }

        .nav-menu {
            gap: 5px;
        }

        .nav-menu a {
            padding: 6px 12px;
            font-size: 13px;
        }

        .logo {
            font-size: 20px;
        }

        .user-info .username {
            font-size: 13px;
        }
    }

    /* 애니메이션 */
    @keyframes fadeIn {
        from {
            opacity: 0;
            transform: translateY(10px);
        }

        to {
            opacity: 1;
            transform: translateY(0);
        }
    }

    .header {
        animation: fadeIn 0.5s ease-out;
    }

    /* 접근성 */
    .header a:focus {
        outline: 2px solid #3498db;
        outline-offset: 2px;
    }

    /* 인쇄 최적화 */
    @media print {
        .header {
            display: none;
        }

        .main-content {
            padding: 0;
        }
    }
}