:root {
    --primary-color: #334155;
    --secondary-color: #F8FAFC;
    --accent-color: #10B981;
    --text-color: #1E293B;
    --border-color: #E2E8F0;
    --sidebar-width: 280px;
    --warning-color: #F59E0B;
    --danger-color: #EF4444;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--secondary-color);
    color: var(--text-color);
    line-height: 1.6;
    display: flex;
}

/* Sidebar Navigation */
.sidebar {
    width: var(--sidebar-width);
    height: 100vh;
    background-color: var(--primary-color);
    color: white;
    position: fixed;
    left: 0;
    top: 0;
    padding: 2rem 1.5rem;
    overflow-y: auto;
    z-index: 1000;
}

.sidebar-brand {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 2.5rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    border-bottom: 1px solid rgba(255,255,255,0.1);
    padding-bottom: 1rem;
}

.nav-menu {
    list-style: none;
}

.nav-item {
    margin-bottom: 0.5rem;
}

.nav-link {
    color: #CBD5E1;
    text-decoration: none;
    display: block;
    padding: 0.75rem 1rem;
    border-radius: 0.375rem;
    transition: all 0.2s;
    font-size: 0.9rem;
}

.nav-link:hover, .nav-link.active {
    background-color: rgba(255,255,255,0.1);
    color: white;
}

/* Main Content Area */
.main-content {
    margin-left: var(--sidebar-width);
    flex: 1;
    padding: 3rem;
    max-width: 1200px;
    margin-right: auto;
}

header {
    margin-bottom: 3rem;
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 1.5rem;
}

h1 {
    font-size: 2.25rem;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

h2 {
    font-size: 1.5rem;
    color: var(--primary-color);
    margin: 2rem 0 1rem;
}

p {
    margin-bottom: 1.25rem;
}

/* Status Badges */
.badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.025em;
}

.badge-success { background-color: #DCFCE7; color: #166534; border: 1px solid #BBF7D0; }
.badge-info { background-color: #DBEAFE; color: #1E40AF; border: 1px solid #BFDBFE; }
.badge-warning { background-color: #FEF3C7; color: #92400E; border: 1px solid #FDE68A; }

/* Callout Boxes */
.callout {
    padding: 1.5rem;
    border-radius: 0.5rem;
    margin-bottom: 1.5rem;
    border-left: 4px solid;
}

.callout-info {
    background-color: #F0F9FF;
    border-color: #0EA5E9;
    color: #0369A1;
}

.callout-warning {
    background-color: #FFFBEB;
    border-color: #F59E0B;
    color: #92400E;
}

.callout-notice {
    background-color: #F8FAFC;
    border-color: #64748B;
    color: #334155;
}

/* Data Tables */
.data-table {
    width: 100%;
    border-collapse: collapse;
    margin: 1.5rem 0;
    background: white;
    border-radius: 0.5rem;
    overflow: hidden;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.data-table th, .data-table td {
    padding: 1rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.data-table th {
    background-color: #F1F5F9;
    font-weight: 600;
    color: var(--primary-color);
}

/* Forms */
.form-group {
    margin-bottom: 1.5rem;
}

label {
    display: block;
    font-weight: 600;
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
}

input, select, textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 0.375rem;
    font-family: inherit;
}

button {
    background-color: var(--primary-color);
    color: white;
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 0.375rem;
    cursor: pointer;
    font-weight: 600;
    transition: background 0.2s;
}

button:hover {
    background-color: #1e293b;
}

/* Responsive */
@media (max-width: 768px) {
    body {
        flex-direction: column;
    }
    .sidebar {
        width: 100%;
        height: auto;
        position: relative;
        padding: 1rem;
    }
    .main-content {
        margin-left: 0;
        padding: 1.5rem;
    }
}