:root {
    --primary: #2563eb;
    --secondary: #1e293b;
    --success: #22c55e;
    --error: #ef4444;
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-600: #4b5563;
    --radius: 8px;
    --shadow: 0 2px 4px rgba(0,0,0,0.1);
}

/* Layout */
body {
    font-family: 'Inter', sans-serif;
    margin: 0;
    padding: 0;
    background: var(--gray-50);
    color: var(--secondary);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Navigation */
.main-header {
    background: white;
    box-shadow: var(--shadow);
}

.nav-main {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
}

.nav-links {
    display: flex;
    gap: 20px;
    align-items: center;
}

/* Buttons */
.btn {
    padding: 8px 16px;
    border-radius: var(--radius);
    border: none;
    cursor: pointer;
    font-weight: 500;
    text-decoration: none;
    display: inline-block;
}

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

.btn-outline {
    border: 1px solid var(--primary);
    color: var(--primary);
    background: transparent;
}

.btn-error {
    background: var(--error);
    color: white;
}

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

    .form-group label {
        display: block;
        margin-bottom: 0.5rem;
        font-weight: 500;
    }

    .form-group input,
    .form-group select,
    .form-group textarea {
        width: 100%;
        padding: 8px;
        border: 1px solid var(--gray-200);
        border-radius: var(--radius);
    }

/* Modals */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.5);
    align-items: center;
    justify-content: center;
}

.modal-content {
    background: white;
    padding: 2rem;
    border-radius: var(--radius);
    max-width: 500px;
    width: 90%;
}

/* Cards */
.card {
    background: white;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 1.5rem;
    margin-bottom: 1rem;
}

/* Footer */
.main-footer {
    background: var(--secondary);
    color: white;
    padding: 4rem 0 2rem;
    margin-top: 4rem;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 40px;
}

/* Utilities */
.text-center {
    text-align: center;
}

.mb-4 {
    margin-bottom: 1rem;
}

.mt-4 {
    margin-top: 1rem;
}