:root {
    --primary: #4F46E5;
    --primary-hover: #4338CA;
    --secondary: #10B981;
    --background: #F3F4F6;
    --surface: #FFFFFF;
    --text-dark: #111827;
    --text-muted: #6B7280;
    --danger: #EF4444;
    --border: #E5E7EB;
    --radius: 8px;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --font: 'Inter', system-ui, -apple-system, sans-serif;
}

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

body {
    font-family: var(--font);
    background-color: var(--background);
    color: var(--text-dark);
    line-height: 1.5;
}

a {
    text-decoration: none;
    color: var(--primary);
}

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

.auth-card {
    background: var(--surface);
    padding: 40px;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    width: 100%;
    max-width: 400px;
    animation: fadeIn 0.3s ease-out;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(-10px); }
    to { opacity: 1; transform: translateY(0); }
}

.auth-card h2 {
    text-align: center;
    margin-bottom: 24px;
    font-weight: 600;
}

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

.form-group label {
    display: block;
    margin-bottom: 6px;
    font-size: 0.875rem;
    color: var(--text-muted);
}

.form-group input, .form-group select {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-size: 1rem;
    transition: border-color 0.2s;
}

.form-group input:focus, .form-group select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.btn {
    display: inline-block;
    width: 100%;
    padding: 10px 16px;
    background-color: var(--primary);
    color: white;
    border: none;
    border-radius: var(--radius);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: background-color 0.2s;
    text-align: center;
}

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

.alert {
    padding: 12px;
    border-radius: var(--radius);
    margin-bottom: 16px;
    font-size: 0.875rem;
    display: none;
}

.alert.success {
    background-color: #D1FAE5;
    color: #065F46;
    display: block;
}

.alert.error {
    background-color: #FEE2E2;
    color: #991B1B;
    display: block;
}

.toggle-auth {
    text-align: center;
    margin-top: 16px;
    font-size: 0.875rem;
}

.toggle-auth a {
    cursor: pointer;
    font-weight: 500;
}
/* Layout Styles */
.app-layout {
    display: flex;
    height: 100vh;
    overflow: hidden;
}

.sidebar {
    width: 260px;
    background: var(--surface);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    transition: transform 0.3s ease;
}

.sidebar-header {
    padding: 20px;
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

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

.sidebar-nav a {
    display: flex;
    align-items: center;
    padding: 12px 24px;
    color: var(--text-muted);
    font-weight: 500;
    transition: all 0.2s;
}

.sidebar-nav a i {
    width: 24px;
    margin-right: 12px;
    font-size: 1.1rem;
}

.sidebar-nav a:hover, .sidebar-nav a.active {
    background: rgba(79, 70, 229, 0.1);
    color: var(--primary);
    border-right: 3px solid var(--primary);
}

.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.topbar {
    background: var(--surface);
    height: 64px;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    padding: 0 24px;
    justify-content: space-between;
}

.content-wrapper {
    flex: 1;
    padding: 24px;
    overflow-y: auto;
}

.mobile-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.25rem;
    cursor: pointer;
    color: var(--text-dark);
}

.mobile-close {
    display: none;
    background: none;
    border: none;
    font-size: 1.25rem;
    cursor: pointer;
    color: var(--text-dark);
}

@media (max-width: 768px) {
    .sidebar {
        position: fixed;
        left: 0;
        top: 0;
        bottom: 0;
        z-index: 50;
        transform: translateX(-100%);
    }
    .sidebar.open {
        transform: translateX(0);
    }
    .mobile-toggle, .mobile-close {
        display: block;
    }
}
/* Modal Styles */
.modal { display: none; position: fixed; inset: 0; background: rgba(0,0,0,0.5); z-index: 100; align-items: center; justify-content: center; }
.modal.active { display: flex; }
.modal-content { background: var(--surface); padding: 24px; border-radius: var(--radius); width: 100%; max-width: 500px; animation: fadeIn 0.2s ease-out; }
.modal-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 20px; }
.modal-close { background: none; border: none; font-size: 1.25rem; cursor: pointer; color: var(--text-muted); }