:root {
    --primary-color: #2563eb;
    --secondary-color: #1e40af;
    --text-color: #1f2937;
    --bg-color: #ffffff;
    --gray-light: #f3f4f6;
    --gray-medium: #9ca3af;
    --border-color: #e5e7eb;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    color: var(--text-color);
    background-color: var(--bg-color);
    line-height: 1.6;
}

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

/* Header */
header {
    background: var(--bg-color);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
}

.main-nav {
    padding: 1rem 0;
}

.main-nav .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary-color);
    text-decoration: none;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-links a {
    color: var(--text-color);
    text-decoration: none;
    transition: color 0.2s;
}

.nav-links a:hover {
    color: var(--primary-color);
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 6rem 0;
    text-align: center;
}

.hero h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.lead {
    font-size: 1.25rem;
    opacity: 0.9;
}

/* Features Section */
.features {
    padding: 4rem 0;
    background: var(--gray-light);
}

.features h2 {
    text-align: center;
    font-size: 2rem;
    margin-bottom: 3rem;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.feature-card {
    background: var(--bg-color);
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    transition: transform 0.2s;
}

.feature-card:hover {
    transform: translateY(-4px);
}

.feature-card h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

/* Page Header */
.page-header {
    background: var(--gray-light);
    padding: 3rem 0;
    border-bottom: 1px solid var(--border-color);
}

.page-header h1 {
    font-size: 2.5rem;
    color: var(--text-color);
}

/* Content Sections */
.content-section, .contact-section {
    padding: 4rem 0;
}

.content-wrapper {
    max-width: 800px;
    margin: 0 auto;
}

.content-wrapper h2 {
    margin: 2rem 0 1rem;
    color: var(--text-color);
}

.content-wrapper h3 {
    margin: 1.5rem 0 0.75rem;
    color: var(--text-color);
}

.content-wrapper p {
    margin-bottom: 1rem;
}

.content-wrapper ul {
    margin: 1rem 0 1rem 2rem;
}

.last-updated {
    color: var(--gray-medium);
    font-style: italic;
    margin-bottom: 2rem;
}

/* Contact Page */
.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    max-width: 1000px;
    margin: 0 auto;
}

.contact-item {
    margin: 1.5rem 0;
}

.contact-item h3 {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

/* Forms */
.form-group {
    margin-bottom: 1.5rem;
}

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

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 1rem;
    transition: border-color 0.2s;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
}

.form-group select {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 1rem;
    background-color: white;
    font-family: inherit;
}

.form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
}

.radio-group,
.checkbox-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    margin-top: 0.5rem;
}

.radio-group label,
.checkbox-group label {
    display: flex;
    align-items: center;
    font-weight: normal;
    cursor: pointer;
}

.radio-group input,
.checkbox-group input {
    margin-right: 0.5rem;
    width: auto;
    cursor: pointer;
}

.form-text {
    font-size: 0.875rem;
    color: #666;
    margin-top: 0.25rem;
}

.form-note {
    margin-top: 1rem;
    padding: 1rem;
    background-color: #e3f2fd;
    border-left: 4px solid var(--primary-color);
    border-radius: 4px;
    font-style: italic;
    color: #333;
}

.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 4px;
    font-size: 1rem;
    cursor: pointer;
    text-decoration: none;
    transition: background-color 0.2s;
}

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

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

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

footer p {
    text-align: center;
}

/* Error Pages */
.error-page {
    padding: 6rem 0;
    text-align: center;
    min-height: 60vh;
    display: flex;
    align-items: center;
}

.error-content h1 {
    font-size: 8rem;
    color: var(--primary-color);
    margin: 0;
    line-height: 1;
}

.error-content h2 {
    font-size: 2rem;
    margin: 1rem 0;
}

.error-content p {
    color: var(--gray-medium);
    margin-bottom: 2rem;
}

.error-actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
}

.btn-secondary {
    background: var(--gray-light);
    color: var(--text-color);
}

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

/* Responsive */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 2rem;
    }
    
    .contact-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .nav-links {
        gap: 1rem;
    }
    
    .error-content h1 {
        font-size: 5rem;
    }
    
    .error-actions {
        flex-direction: column;
        align-items: center;
    }
}