/* ===== 전역 스타일 ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: #f5f7fa;
    color: #333;
    display: flex;
    min-height: 100vh;
}

/* ===== 사이드바 ===== */
#sidebar {
    width: 260px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    position: fixed;
    height: 100vh;
    overflow-y: auto;
    box-shadow: 2px 0 10px rgba(0,0,0,0.1);
    z-index: 1000;
}

.sidebar-header {
    padding: 25px 20px;
    text-align: center;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

.sidebar-header h3 {
    font-size: 1.4em;
    font-weight: 600;
}

.sidebar-header i {
    margin-right: 8px;
}

.nav-menu {
    list-style: none;
    padding: 10px 0;
}

.nav-menu li a {
    display: block;
    padding: 15px 25px;
    color: rgba(255,255,255,0.9);
    text-decoration: none;
    transition: all 0.3s ease;
    border-left: 3px solid transparent;
}

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

.nav-menu li a i {
    margin-right: 12px;
    width: 20px;
    text-align: center;
}

/* ===== 메인 컨텐츠 ===== */
#main-content {
    margin-left: 260px;
    width: calc(100% - 260px);
    min-height: 100vh;
}

header {
    background: white;
    padding: 20px 30px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.08);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

header h1 {
    font-size: 1.8em;
    color: #2c3e50;
}

.header-actions {
    display: flex;
    gap: 15px;
    align-items: center;
}

#current-date {
    color: #7f8c8d;
    font-size: 0.95em;
}

main {
    padding: 30px;
}

/* ===== 카드 스타일 ===== */
.card {
    background: white;
    border-radius: 10px;
    padding: 25px;
    margin-bottom: 25px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 2px solid #f0f0f0;
}

.card-header h2 {
    font-size: 1.4em;
    color: #2c3e50;
}

.card-header .actions {
    display: flex;
    gap: 10px;
}

/* ===== 버튼 스타일 ===== */
.btn {
    padding: 10px 20px;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.95em;
    font-weight: 500;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 8px rgba(0,0,0,0.15);
}

.btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.btn-success {
    background: linear-gradient(135deg, #11998e 0%, #38ef7d 100%);
    color: white;
}

.btn-danger {
    background: linear-gradient(135deg, #eb3349 0%, #f45c43 100%);
    color: white;
}

.btn-warning {
    background: linear-gradient(135deg, #f7971e 0%, #ffd200 100%);
    color: #333;
}

.btn-info {
    background: linear-gradient(135deg, #2196f3 0%, #21cbf3 100%);
    color: white;
}

.btn-secondary {
    background: #95a5a6;
    color: white;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* ===== 테이블 스타일 ===== */
.table-container {
    overflow-x: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
    background: white;
}

thead {
    background: #f8f9fa;
}

th, td {
    padding: 12px 15px;
    text-align: left;
    border-bottom: 1px solid #e9ecef;
}

th {
    font-weight: 600;
    color: #495057;
    text-transform: uppercase;
    font-size: 0.85em;
    letter-spacing: 0.5px;
}

tbody tr:hover {
    background: #f8f9fa;
}

tbody tr:last-child td {
    border-bottom: none;
}

/* ===== 폼 스타일 ===== */
.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: #495057;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 10px 15px;
    border: 1px solid #ced4da;
    border-radius: 6px;
    font-size: 0.95em;
    transition: border-color 0.3s;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
}

/* ===== 배지 스타일 ===== */
.badge {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 12px;
    font-size: 0.85em;
    font-weight: 500;
}

.badge-success {
    background: #d4edda;
    color: #155724;
}

.badge-warning {
    background: #fff3cd;
    color: #856404;
}

.badge-danger {
    background: #f8d7da;
    color: #721c24;
}

.badge-info {
    background: #d1ecf1;
    color: #0c5460;
}

.badge-secondary {
    background: #e2e3e5;
    color: #383d41;
}

.badge-primary {
    background: #e7e9fc;
    color: #667eea;
}

/* ===== 모달 스타일 ===== */
.modal {
    display: none;
    position: fixed;
    z-index: 2000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.5);
    animation: fadeIn 0.3s;
}

.modal.show {
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-content {
    background: white;
    border-radius: 12px;
    width: 90%;
    max-width: 600px;
    max-height: 90vh;
    overflow-y: auto;
    animation: slideUp 0.3s;
    box-shadow: 0 10px 40px rgba(0,0,0,0.2);
}

.modal-header {
    padding: 20px 25px;
    border-bottom: 1px solid #e9ecef;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h3 {
    margin: 0;
    color: #2c3e50;
}

.modal-body {
    padding: 25px;
}

.modal-footer {
    padding: 15px 25px;
    border-top: 1px solid #e9ecef;
    display: flex;
    justify-content: flex-end;
    gap: 10px;
}

.close {
    color: #aaa;
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
    line-height: 1;
}

.close:hover {
    color: #000;
}

/* ===== 대시보드 카드 ===== */
.dashboard-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.dash-card {
    background: white;
    border-radius: 10px;
    padding: 25px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
    display: flex;
    align-items: center;
    gap: 20px;
}

.dash-card-icon {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    color: white;
}

.dash-card-icon.primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.dash-card-icon.success {
    background: linear-gradient(135deg, #11998e 0%, #38ef7d 100%);
}

.dash-card-icon.warning {
    background: linear-gradient(135deg, #f7971e 0%, #ffd200 100%);
}

.dash-card-icon.danger {
    background: linear-gradient(135deg, #eb3349 0%, #f45c43 100%);
}

.dash-card-info h3 {
    font-size: 2em;
    margin-bottom: 5px;
    color: #2c3e50;
}

.dash-card-info p {
    color: #7f8c8d;
    font-size: 0.95em;
}

/* ===== 검색 바 ===== */
.search-bar {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
}

.search-bar input {
    flex: 1;
    padding: 10px 15px;
    border: 1px solid #ced4da;
    border-radius: 6px;
    font-size: 0.95em;
}

/* ===== 알림/경고 ===== */
.alert {
    padding: 15px 20px;
    border-radius: 6px;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.alert-warning {
    background: #fff3cd;
    border-left: 4px solid #ffc107;
    color: #856404;
}

.alert-danger {
    background: #f8d7da;
    border-left: 4px solid #dc3545;
    color: #721c24;
}

.alert-info {
    background: #d1ecf1;
    border-left: 4px solid #17a2b8;
    color: #0c5460;
}

.alert-success {
    background: #d4edda;
    border-left: 4px solid #28a745;
    color: #155724;
}

/* ===== 애니메이션 ===== */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes slideUp {
    from { 
        transform: translateY(50px);
        opacity: 0;
    }
    to { 
        transform: translateY(0);
        opacity: 1;
    }
}

/* ===== 반응형 디자인 ===== */
@media (max-width: 768px) {
    #sidebar {
        width: 70px;
    }
    
    #sidebar .sidebar-header h3,
    #sidebar .nav-menu li a span {
        display: none;
    }
    
    #main-content {
        margin-left: 70px;
        width: calc(100% - 70px);
    }
    
    .dashboard-cards {
        grid-template-columns: 1fr;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
}

/* ===== 유틸리티 클래스 ===== */
.text-center { text-align: center; }
.text-right { text-align: right; }
.mt-10 { margin-top: 10px; }
.mt-20 { margin-top: 20px; }
.mb-10 { margin-bottom: 10px; }
.mb-20 { margin-bottom: 20px; }
.hidden { display: none; }
.flex { display: flex; }
.gap-10 { gap: 10px; }
.gap-20 { gap: 20px; }
.justify-between { justify-content: space-between; }
.align-center { align-items: center; }