* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --secondary-color: #64748b;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #f1f5f9;
    
    --text-primary: #1a1a1a;
    --text-secondary: #4a5568;
    --text-tertiary: #718096;
    --text-muted: #a0aec0;
    
    --border-color: #e2e8f0;
    --border-hover: #cbd5e0;
    
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 2px 4px 0 rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 4px 8px 0 rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 8px 16px 0 rgba(0, 0, 0, 0.12);
    
    --radius-sm: 4px;
    --radius-md: 6px;
    --radius-lg: 8px;
    --radius-xl: 12px;
    --radius-full: 9999px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Noto Sans KR", "Apple SD Gothic Neo", sans-serif;
    line-height: 1.5;
    color: var(--text-primary);
    background: var(--bg-secondary);
    font-size: 14px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a {
    text-decoration: none;
    color: inherit;
    transition: color 0.2s ease;
}

a:hover {
    color: var(--primary-color);
}

button {
    font-family: inherit;
    cursor: pointer;
    transition: all 0.2s ease;
}

input, textarea, select {
    font-family: inherit;
    transition: all 0.2s ease;
    font-size: 14px;
}

input:focus, textarea:focus, select:focus {
    outline: none;
}

/* 공통 헤더 스타일 */
.main-container {
    min-height: 100vh;
    transition: margin-left 0.3s ease;
    background: var(--bg-secondary);
}

.main-header {
    background: var(--bg-primary);
    padding: 12px 20px;
    box-shadow: var(--shadow-sm);
    display: flex;
    align-items: center;
    gap: 12px;
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
}

.menu-toggle {
    background: none;
    border: none;
    font-size: 18px;
    cursor: pointer;
    color: var(--text-primary);
    padding: 6px;
    border-radius: var(--radius-sm);
    transition: background 0.2s ease;
}

.menu-toggle:hover {
    background: var(--bg-tertiary);
}

.main-header .logo {
    font-size: 18px;
    font-weight: 700;
    color: var(--primary-color);
    letter-spacing: -0.3px;
    margin: 0;
    display: flex;
    align-items: center;
    gap: 8px;
}

.main-header .logo i {
    font-size: 20px;
}

.main-header .logo span {
    display: inline-block;
}

/* PC 버전 사이드바 관련 스타일 */
@media (min-width: 1200px) {
    .main-container {
        margin-left: 280px;
    }
    
    body.sidebar-closed .main-container {
        margin-left: 60px;
    }
    
    .menu-toggle {
        display: none;
    }
    
    body.sidebar-closed .menu-toggle {
        display: none;
    }
}