:root {
    /* Classic Bullion Palette */
    --primary: #0A192F;       /* Deep Navy Blue */
    --accent: #D4AF37;        /* Metallic Gold */
    --bg-main: #F5F5F5;       /* Light Grey Background */
    --bg-card: #FFFFFF;       /* White Cards */
    --text-on-dark: #FFFFFF;
    --text-on-light: #0A192F;
    --text-muted: #666666;
    
    /* Action Colors */
    --success: #28A745;
    --warning: #FB8C00;
    --danger: #DC3545;
    
    /* Layout Constants */
    --sidebar-width: 280px;
    --navbar-height: 70px;
    --spacing-xs: 4px;
    --spacing-s: 8px;
    --spacing-m: 16px;
    --spacing-l: 24px;
    --spacing-xl: 32px;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', sans-serif;
}

body {
    background-color: var(--bg-main);
    color: var(--text-on-light);
    overflow-x: hidden;
}

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

/* Sidebar Styling */
.sidebar {
    width: var(--sidebar-width);
    background-color: var(--primary);
    color: var(--text-on-dark);
    display: flex;
    flex-direction: column;
    position: fixed;
    height: 100vh;
    z-index: 1000;
}

.sidebar-header {
    height: var(--navbar-height);
    display: flex;
    align-items: center;
    padding: 0 24px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.sidebar-header .logo {
    color: var(--accent);
    font-weight: 800;
    font-size: 1.4rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.sidebar-menu {
    flex: 1;
    padding: 24px 0;
    overflow-y: auto;
}

.menu-label {
    padding: 12px 24px 8px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    color: rgba(255, 255, 255, 0.4);
    letter-spacing: 1px;
}

.menu-item {
    display: flex;
    align-items: center;
    padding: 14px 24px;
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: all 0.3s;
    font-weight: 500;
    border-left: 4px solid transparent;
}

.menu-item:hover {
    background-color: rgba(255, 255, 255, 0.05);
    color: var(--text-on-dark);
}

.menu-item.active {
    background-color: rgba(255, 255, 255, 0.1);
    color: var(--accent);
    border-left-color: var(--accent);
}

.menu-item i {
    width: 24px;
    margin-right: 12px;
    font-size: 1.1rem;
}

/* Main Content Area */
.main-content {
    flex: 1;
    margin-left: var(--sidebar-width);
    display: flex;
    flex-direction: column;
}

/* Navbar Styling */
.navbar {
    height: var(--navbar-height);
    background-color: var(--bg-card);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 32px;
    position: sticky;
    top: 0;
    z-index: 900;
    border-bottom: 1px solid #E0E0E0;
}

.page-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
}

.nav-user {
    display: flex;
    align-items: center;
    gap: 12px;
}

.user-name {
    font-weight: 600;
    color: var(--primary);
}

/* Dashboard & Cards */
.content-area {
    padding: 32px;
}

.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 24px;
    margin-bottom: 32px;
}

.stat-card {
    background-color: var(--primary);
    color: var(--text-on-dark);
    padding: 24px;
    border-radius: 4px; /* Flat design */
    display: flex;
    flex-direction: column;
    justify-content: center;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.stat-card .label {
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: 12px;
}

.stat-card .value {
    font-size: 2.5rem;
    font-weight: 800;
}

/* Tables */
.section-card {
    background-color: var(--bg-card);
    border-radius: 4px;
    padding: 0;
    margin-bottom: 32px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
    border: 1px solid #E0E0E0;
}

.section-header {
    padding: 20px 24px;
    border-bottom: 1px solid #EEEEEE;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.section-header h3 {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--primary);
}

.table-responsive {
    overflow-x: auto;
}

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

th {
    text-align: left;
    padding: 16px 24px;
    background-color: #F8F9FA;
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

td {
    padding: 16px 24px;
    border-bottom: 1px solid #F0F0F0;
    font-size: 0.95rem;
    color: var(--primary);
}

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

/* Buttons */
.btn {
    padding: 10px 20px;
    border-radius: 2px;
    font-weight: 600;
    font-size: 0.85rem;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    border: none;
    transition: opacity 0.2s;
}

.btn:hover {
    opacity: 0.9;
}

.btn-primary { background-color: var(--primary); color: var(--text-on-dark); }
.btn-accent { background-color: var(--accent); color: var(--primary); }
.btn-success { background-color: var(--success); color: var(--text-on-dark); }
.btn-warning { background-color: var(--warning); color: var(--text-on-dark); }
.btn-danger { background-color: var(--danger); color: var(--text-on-dark); }

/* Badges */
.badge {
    padding: 4px 10px;
    font-size: 0.75rem;
    font-weight: 700;
    border-radius: 2px;
    text-transform: uppercase;
}

.badge-success { background-color: rgba(40, 167, 69, 0.1); color: var(--success); }
.badge-pending { background-color: rgba(251, 140, 0, 0.1); color: var(--warning); }
.badge-danger { background-color: rgba(220, 53, 69, 0.1); color: var(--danger); }

/* Forms */
.form-group {
    margin-bottom: 24px;
}

.form-group label {
    display: block;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--primary);
    font-size: 0.9rem;
}

.form-control {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid #CCCCCC;
    border-radius: 2px;
    background-color: #FFFFFF;
    font-size: 1rem;
    color: var(--primary);
}

.form-control:focus {
    outline: none;
    border-color: var(--primary);
}

/* Responsive */
@media (max-width: 992px) {
    .sidebar {
        width: 0;
        overflow: hidden;
    }
    .main-content {
        margin-left: 0;
    }
}