:root {
    --primary-color: #2c3e50;
    --secondary-color: #27ae60;
    --accent-color: #e67e22;
    --text-color: #333;
    --bg-color: #f4f7f6;
    --sidebar-width: 250px;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg-color);
    margin: 0;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.container {
    width: 90%;
    max-width: 1200px;
    margin: auto;
}

/* Auth Pages */
.auth-container {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
}

.auth-box {
    background: white;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    width: 100%;
    max-width: 400px;
}

.auth-box h2 {
    text-align: center;
    color: var(--primary-color);
    margin-bottom: 1.5rem;
}

.form-group {
    margin-bottom: 1rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
}

.form-group input {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid #ddd;
    border-radius: 4px;
    box-sizing: border-box;
}

.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-weight: bold;
    text-decoration: none;
    transition: background 0.3s;
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
    width: 100%;
}

.btn-primary:hover {
    background-color: #34495e;
}

/* Dashboard */
.dashboard-wrapper {
    display: flex;
    flex: 1;
}

.sidebar {
    width: var(--sidebar-width);
    background-color: var(--primary-color);
    color: white;
    padding: 1rem;
    position: sticky;
    top: 0;
    height: 100vh;
}

.sidebar h1 {
    font-size: 1.5rem;
    margin-bottom: 2rem;
    text-align: center;
}

.sidebar nav ul {
    list-style: none;
    padding: 0;
}

.sidebar nav ul li {
    margin-bottom: 1rem;
}

.sidebar nav ul li a {
    color: white;
    text-decoration: none;
    display: block;
    padding: 0.75rem;
    border-radius: 4px;
}

.sidebar nav ul li a:hover {
    background-color: #34495e;
}

.main-content {
    flex: 1;
    padding: 2rem;
}

.card {
    background: white;
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
    margin-bottom: 1.5rem;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.stat-card {
    background: white;
    padding: 1.5rem;
    border-radius: 8px;
    text-align: center;
    border-left: 5px solid var(--secondary-color);
}

table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 1rem;
}

table th, table td {
    padding: 1rem;
    text-align: left;
    border-bottom: 1px solid #eee;
}

table th {
    background-color: #f8f9fa;
}

/* Forms */
.form-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
}

@media (max-width: 768px) {
    .dashboard-wrapper {
        flex-direction: column;
    }
    .sidebar {
        width: 100%;
        height: auto;
    }
    .form-grid {
        grid-template-columns: 1fr;
    }
}