:root {
    --primary: #2587E8;
    --primary-dark: #1769AA;
    --background: #F5F7FA;
    --card-bg: #FFFFFF;
    --text-main: #1F2937;
    --text-secondary: #6B7280;
    --success: #2DBE8C;
    --warning: #F4B740;
    --danger: #EF5350;
    --border-color: #E5E7EB;
    --sidebar-width: 250px;
    --header-height: 70px;
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
}

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

body {
    font-family: var(--font-family);
    background-color: var(--background);
    color: var(--text-main);
    line-height: 1.5;
    overflow-x: hidden;
}

a {
    text-decoration: none;
    color: var(--primary);
}

ul {
    list-style: none;
}

button {
    cursor: pointer;
    font-family: var(--font-family);
    border: none;
    outline: none;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.5rem 1rem;
    border-radius: 6px;
    font-weight: 500;
    transition: all 0.2s ease;
}

.btn-primary {
    background-color: var(--primary);
    color: white;
}

.btn-primary:hover {
    background-color: var(--primary-dark);
}

.card {
    background-color: var(--card-bg);
    border-radius: 8px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.05), 0 1px 2px rgba(0,0,0,0.025);
    padding: 1.5rem;
    border: 1px solid var(--border-color);
}

.page-wrapper {
    display: flex;
    min-height: 100vh;
}

.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-width: 0;
    margin-left: var(--sidebar-width);
    transition: margin-left 0.3s ease;
}

.content-area {
    padding: 1.5rem;
    flex: 1;
}

.page-title {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    color: var(--text-main);
}