:root {
    --primary-color: #635bff;
    --primary-hover: #0a2540;
    --bg-color: #f7f9fc;
    --surface-color: #ffffff;
    --text-main: #1a1f36;
    --text-muted: #4f566b;
    --border-color: #e3e8ee;
    --danger-color: #df1b41;
    --success-color: #00d924;
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --shadow-sm: 0 2px 5px rgba(60, 66, 87, 0.08);
    --shadow-md: 0 5px 15px rgba(0, 0, 0, 0.08);
    --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

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

body {
    font-family: var(--font-family);
    background-color: var(--bg-color);
    color: var(--text-main);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

.auth-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.auth-card {
    background: var(--surface-color);
    padding: 40px;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
    width: 100%;
    max-width: 400px;
}

.auth-card h1 {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-main);
}

.auth-card p {
    color: var(--text-muted);
    font-size: 14px;
    margin-bottom: 24px;
}

.form-group {
    margin-bottom: 16px;
}

.form-label {
    display: block;
    font-size: 13px;
    font-weight: 500;
    margin-bottom: 6px;
    color: var(--text-main);
}

.form-control {
    width: 100%;
    padding: 10px 12px;
    font-size: 14px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    outline: none;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.form-control:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 91, 255, 0.15);
}

.btn-primary {
    display: block;
    width: 100%;
    padding: 10px 16px;
    background-color: var(--primary-color);
    color: #ffffff;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: background-color 0.2s ease;
    text-align: center;
    text-decoration: none;
}

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

.alert {
    padding: 12px;
    border-radius: var(--radius-sm);
    margin-bottom: 16px;
    font-size: 14px;
}

.alert-danger {
    background-color: #fdeaea;
    color: var(--danger-color);
    border: 1px solid #f9c2c2;
}
.app-layout {
    display: flex;
    height: 100vh;
    overflow: hidden;
}

.sidebar {
    width: 250px;
    background-color: var(--surface-color);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
}

.sidebar-header {
    padding: 20px;
    border-bottom: 1px solid var(--border-color);
}

.sidebar-header h2 {
    font-size: 20px;
    color: var(--text-main);
    font-weight: 600;
}

.sidebar-nav {
    flex: 1;
    padding: 20px 0;
    overflow-y: auto;
}

.nav-item {
    display: block;
    padding: 10px 20px;
    color: var(--text-muted);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    transition: background-color 0.2s, color 0.2s;
}

.nav-item:hover, .nav-item.active {
    background-color: rgba(99, 91, 255, 0.05);
    color: var(--primary-color);
}

.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    background-color: var(--bg-color);
}

.topbar {
    height: 60px;
    background-color: var(--surface-color);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 20px;
}

.user-profile {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 14px;
    font-weight: 500;
}

.btn-logout {
    color: var(--danger-color);
    text-decoration: none;
    font-size: 13px;
    font-weight: 500;
}

.content-area {
    padding: 30px;
    overflow-y: auto;
    flex: 1;
}

.page-title {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 20px;
}

.dashboard-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
}

.card {
    background: var(--surface-color);
    padding: 20px;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
}

.card h3 {
    font-size: 14px;
    color: var(--text-muted);
    margin-bottom: 10px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.card .value {
    font-size: 28px;
    font-weight: 600;
    color: var(--text-main);
}