/* variables and reset */
:root {
    --primary: #2563eb;
    --primary-hover: #1d4ed8;
    --secondary: #475569;
    --background: #f8fafc;
    --panel-bg: #ffffff;
    --sidebar-bg: #1e293b;
    --sidebar-hover: #334155;
    --text-main: #0f172a;
    --text-muted: #64748b;
    --border: #e2e8f0;
    --success: #10b981;
    --danger: #ef4444;
    --warning: #f59e0b;
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--background);
    color: var(--text-main);
    line-height: 1.5;
}

/* App Layout */
.app-container {
    display: flex;
    height: 100vh;
    overflow: hidden;
}

/* Sidebar */
.sidebar {
    width: 260px;
    background-color: var(--sidebar-bg);
    color: white;
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
}

.sidebar-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--sidebar-hover);
}

.sidebar-header h2 {
    font-size: 1.25rem;
    font-weight: 600;
    letter-spacing: 0.5px;
}

.sidebar-nav {
    flex-grow: 1;
    overflow-y: auto;
    padding: 1rem 0;
}

.sidebar-nav ul {
    list-style: none;
}

.sidebar-nav a {
    display: block;
    padding: 0.75rem 1.5rem;
    color: #cbd5e1;
    text-decoration: none;
    transition: background-color 0.2s, color 0.2s;
}

.sidebar-nav a:hover,
.sidebar-nav a.active {
    background-color: var(--sidebar-hover);
    color: white;
    border-left: 4px solid var(--primary);
}

.sidebar-footer {
    padding: 1rem;
    border-top: 1px solid var(--sidebar-hover);
}

.logout-btn {
    display: block;
    text-align: center;
    padding: 0.5rem;
    color: #cbd5e1;
    text-decoration: none;
    border: 1px solid var(--sidebar-hover);
    border-radius: 4px;
    transition: all 0.2s;
}

.logout-btn:hover {
    background-color: var(--danger);
    color: white;
    border-color: var(--danger);
}

/* Main Content Area */
.main-content {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

/* Topbar */
.topbar {
    height: 64px;
    background-color: var(--panel-bg);
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 2rem;
    flex-shrink: 0;
}

.topbar-title h1 {
    font-size: 1.25rem;
    font-weight: 500;
}

.topbar-user {
    font-size: 0.875rem;
    color: var(--secondary);
    font-weight: 500;
}

/* Content Wrapper */
.content-wrapper {
    flex-grow: 1;
    padding: 2rem;
    overflow-y: auto;
}

/* Dashboard Specifics */
.dashboard-content h2 {
    margin-bottom: 0.5rem;
}

.dashboard-content p {
    color: var(--text-muted);
    margin-bottom: 2rem;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
}

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

.stat-card h3 {
    font-size: 0.875rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 0.5rem;
}

.stat-card .stat-number {
    font-size: 2rem;
    font-weight: 600;
    color: var(--text-main);
}

/* Utility Classes */
.mt-2 {
    margin-top: 0.5rem;
}

.mt-4 {
    margin-top: 1.5rem;
}

.text-center {
    text-align: center;
}

.text-muted {
    color: var(--text-muted);
}

.d-flex-between {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

/* Cards & Forms */
.card {
    background: var(--panel-bg);
    border-radius: 8px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
    border: 1px solid var(--border);
    margin-bottom: 2rem;
}

.card-header {
    padding: 1.25rem 1.5rem;
    border-bottom: 1px solid var(--border);
}

.card-header h3 {
    font-size: 1.125rem;
    font-weight: 500;
}

.card-body {
    padding: 1.5rem;
}

.btn-primary {
    background-color: var(--primary);
    color: white;
    border: none;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    cursor: pointer;
    transition: background-color 0.2s;
}

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

.form-control {
    width: 100%;
    padding: 0.5rem;
    border: 1px solid var(--border);
    border-radius: 4px;
}

/* Tables */
.table {
    width: 100%;
    border-collapse: collapse;
}

.table th,
.table td {
    padding: 0.75rem 1rem;
    text-align: left;
    border-bottom: 1px solid var(--border);
}

.table th {
    background-color: #f1f5f9;
    font-weight: 600;
    color: var(--secondary);
    font-size: 0.875rem;
}

/* Alerts */
.alert {
    padding: 1rem;
    border-radius: 4px;
    border: 1px solid transparent;
}

.alert-info {
    color: #0c5460;
    background-color: #d1ecf1;
    border-color: #bee5eb;
}