:root {
    --bg-color: #f5f6f8;
    --card-bg: #ffffff;
    --text-dark: #1f2937;
    --text-muted: #6b7280;
    --primary: #2563eb;
    --primary-hover: #1d4ed8;
    --success: #16a34a;
    --warning: #d97706;
    --error: #dc2626;
    --border-radius: 12px;
    --shadow: 0 1px 3px rgba(0,0,0,0.1);
    --border-color: #e5e7eb;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
body { 
    font-family: 'Pretendard', sans-serif; 
    background-color: var(--bg-color); 
    color: var(--text-dark); 
    line-height: 1.5; 
}

.text-muted { color: var(--text-muted); }
.text-center { text-align: center; }
.py-4 { padding-top: 1rem; padding-bottom: 1rem; }

/* 네비게이션 */
.top-nav { 
    display: flex; 
    justify-content: space-between; 
    align-items: center; 
    background: var(--card-bg); 
    padding: 1rem 2rem; 
    box-shadow: var(--shadow); 
}
.top-nav .logo { font-size: 1.25rem; font-weight: 700; color: var(--primary); }
.nav-links a { 
    margin-left: 1rem; 
    text-decoration: none; 
    color: var(--text-muted); 
    font-weight: 500; 
    transition: color 0.2s; 
}
.nav-links a:hover, .nav-links a.active { color: var(--primary); }

/* 메인 레이아웃 */
.dashboard-container { padding: 2rem; max-width: 1440px; margin: 0 auto; }
.header-actions { display: flex; justify-content: space-between; align-items: center; margin-bottom: 2rem; }
.header-actions h1 { font-size: 1.75rem; font-weight: 700; margin: 0; }
.controls { display: flex; gap: 1rem; align-items: center; }
.auto-refresh-toggle { display: flex; align-items: center; gap: 0.5rem; cursor: pointer; color: var(--text-muted); font-size: 0.875rem; }

/* 버튼 */
.btn-primary { 
    background: var(--primary); 
    color: white; 
    border: none; 
    padding: 0.5rem 1rem; 
    border-radius: 6px; 
    font-weight: 500; 
    cursor: pointer; 
    transition: background 0.2s; 
}
.btn-primary:hover { background: var(--primary-hover); }
.btn-primary:disabled { opacity: 0.6; cursor: not-allowed; }
.btn-small { padding: 0.25rem 0.5rem; font-size: 0.875rem; }
.btn-danger-outline { 
    background: white; 
    color: var(--error); 
    border: 1px solid var(--error); 
    padding: 0.25rem 0.5rem; 
    border-radius: 6px; 
    font-size: 0.875rem;
    cursor: pointer;
    transition: background 0.2s;
}
.btn-danger-outline:hover { background: #fee2e2; }

/* 카드 및 그리드 */
.grid-4 { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 1.5rem; margin-bottom: 2rem; }
.grid-2-layout { display: grid; grid-template-columns: 1fr 1fr; gap: 1.5rem; }

.card { 
    background: var(--card-bg); 
    border-radius: var(--border-radius); 
    padding: 1.5rem; 
    box-shadow: var(--shadow); 
}
.card h3 { font-size: 1.1rem; color: var(--text-muted); margin-bottom: 1rem; margin-top: 0; }
.section-header h2 { font-size: 1.25rem; margin-bottom: 1rem; margin-top: 0; }

/* 지표 */
.stat-content { display: flex; flex-direction: column; gap: 0.5rem; }
.stat-number { font-size: 1.5rem; font-weight: 700; }
.stat-sub { font-size: 0.875rem; color: var(--text-muted); }

/* 프로그레스 바 */
.progress-container { 
    width: 100%; 
    background-color: var(--border-color); 
    border-radius: 999px; 
    height: 8px; 
    overflow: hidden; 
    margin-top: 0.5rem; 
    margin-bottom: 0.25rem; 
}
.progress-bar { height: 100%; transition: width 0.5s ease-in-out; }
.color-success { background-color: var(--success); }
.color-warning { background-color: var(--warning); }
.color-error { background-color: var(--error); }
.text-success { color: var(--success); }
.text-warning { color: var(--warning); }
.text-error { color: var(--error); }

/* 배지 */
.badge { 
    padding: 0.2rem 0.5rem; 
    border-radius: 999px; 
    font-size: 0.75rem; 
    background: #e5e7eb; 
    color: var(--text-dark); 
    display: inline-block; 
    margin-bottom: 0.25rem;
    margin-right: 0.25rem;
}

/* 테이블 */
.table-section { display: flex; flex-direction: column; }
.table-responsive { overflow-x: auto; max-height: 500px; overflow-y: auto; }
table { width: 100%; border-collapse: collapse; text-align: left; }
th, td { padding: 0.75rem 1rem; border-bottom: 1px solid var(--border-color); }
th { 
    position: sticky; 
    top: 0; 
    background: var(--card-bg); 
    color: var(--text-muted); 
    font-size: 0.875rem; 
    font-weight: 600; 
    z-index: 1; 
}
tbody tr:nth-child(even) { background-color: #f9fafb; }
tbody tr:hover { background-color: #f3f4f6; }
.td-small { font-size: 0.875rem; }
.actions-cell { display: flex; gap: 0.5rem; }

/* 토스트 알림 */
.toast-container { position: fixed; top: 1rem; right: 1rem; z-index: 9999; display: flex; flex-direction: column; gap: 0.5rem; }
.toast { 
    background: white; 
    padding: 1rem 1.5rem; 
    border-radius: 8px; 
    box-shadow: 0 4px 6px rgba(0,0,0,0.1); 
    border-left: 4px solid var(--primary); 
    animation: slideIn 0.3s ease; 
    font-weight: 500;
    transition: opacity 0.3s;
}
.toast.success { border-left-color: var(--success); }
.toast.error { border-left-color: var(--error); }
@keyframes slideIn { 
    from { transform: translateX(100%); opacity: 0; } 
    to { transform: translateX(0); opacity: 1; } 
}