/**
 * DJ테크트리 LMS 관리자 - 공통 사이드바 스타일
 * 
 * 이 파일은 admin 폴더 전체의 사이드바 스타일을 중앙에서 관리합니다.
 * 모든 admin 페이지에서 동일한 사이드바 스타일을 제공합니다.
 */

/* 레이아웃 */
.admin-container {
    display: flex;
    min-height: 100vh;
}

/* 좌측 사이드바 */
.sidebar {
    width: 260px;
    background: #1a1d2e;
    color: white;
    position: fixed;
    height: 100vh;
    overflow-y: auto;
    z-index: 1000;
}

.sidebar-header {
    padding: 20px;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

.sidebar-logo {
    display: flex;
    align-items: center;
    text-decoration: none;
    color: white;
    font-size: 24px;
    font-weight: 900;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -1px;
}

/* 네비게이션 */
.sidebar-nav {
    padding: 20px 0;
}

.nav-section {
    margin-bottom: 4px;
}

.nav-section-title {
    padding: 12px 20px;
    font-size: 14px;
    color: rgba(255,255,255,0.8);
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-left: 3px solid transparent;
    user-select: none;
}

.nav-section-title:hover {
    background: rgba(255,255,255,0.05);
    color: white;
}

.nav-section.active > .nav-section-title {
    background: rgba(255,255,255,0.08);
    color: white;
    border-left-color: #2196F3;
}

.toggle-icon {
    font-size: 10px;
    transition: transform 0.3s;
}

.nav-menu {
    list-style: none;
    padding: 0;
    margin: 0;
}

.submenu {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease-out;
    background: rgba(0,0,0,0.2);
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 20px 10px 40px;
    color: rgba(255,255,255,0.7);
    text-decoration: none;
    transition: all 0.2s;
    font-size: 13px;
    border-left: 3px solid transparent;
}

.nav-link:hover {
    background: rgba(255,255,255,0.05);
    color: white;
}

.nav-link.active {
    background: rgba(33,150,243,0.15);
    color: white;
    border-left-color: #2196F3;
}

.nav-link i {
    width: 18px;
    text-align: center;
    font-size: 14px;
}

/* 메인 메뉴 (서브메뉴 없음) */
.nav-section:not(:has(.submenu)) .nav-link {
    padding-left: 20px;
}

/* 우측 메인 콘텐츠 */
.main-content {
    flex: 1;
    margin-left: 260px;
    display: flex;
    flex-direction: column;
}

/* 반응형 - 모바일 */
@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
        transition: transform 0.3s;
    }

    .sidebar.active {
        transform: translateX(0);
    }

    .main-content {
        margin-left: 0;
    }
}