/* CSS Custom Properties */
:root {
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --secondary-color: #64748b;
    --background-color: #ffffff;
    --text-color: #1f2937;
    --text-light: #6b7280;
    --border-color: #e5e7eb;
    --success-color: #10b981;
    --error-color: #ef4444;
    --border-radius: 8px;
    --spacing-unit: 1rem;
    --max-width: 1200px;
}

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

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

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

.main-nav {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-unit);
    display: flex;
    justify-content: space-between;
    align-items: center;
    min-height: 64px;
}

.nav-brand h1 {
    font-size: 1.25rem;
    color: var(--primary-color);
}

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

.nav-link {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius);
    transition: all 0.2s ease;
}

.nav-link:hover,
.nav-link.active {
    background-color: var(--primary-color);
    color: white;
}

/* Main Content */
.main-content {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 2rem var(--spacing-unit);
    min-height: calc(100vh - 140px);
}

/* Loading and Error States */
.loading {
    text-align: center;
    padding: 4rem 0;
    color: var(--text-light);
    font-size: 1.1rem;
}

.error-page {
    text-align: center;
    padding: 4rem 2rem;
}

.error-page h1 {
    color: var(--error-color);
    margin-bottom: 1rem;
}

.error-page p {
    margin-bottom: 2rem;
    color: var(--text-light);
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    text-decoration: none;
    border-radius: var(--border-radius);
    font-weight: 500;
    transition: all 0.2s ease;
    border: none;
    cursor: pointer;
    font-size: 1rem;
}

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

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

.btn-secondary {
    background-color: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

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

/* Home Page Styles */
.hero {
    text-align: center;
    padding: 4rem 0;
}

.hero h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
    color: var(--text-color);
}

.lead {
    font-size: 1.25rem;
    color: var(--text-light);
    margin-bottom: 2rem;
}

.cta-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

.features {
    padding: 4rem 0;
}

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

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

.feature {
    padding: 2rem;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    text-align: center;
}

.feature h3 {
    margin-bottom: 1rem;
    font-size: 1.25rem;
}

/* About Page Styles */
.about-page {
    max-width: 800px;
    margin: 0 auto;
}

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

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

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

.about-content li {
    margin-bottom: 0.5rem;
}

.callout {
    background-color: #f8fafc;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    margin: 2rem 0;
}

/* Contact Page Styles */
.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: start;
}

.contact-methods {
    margin-top: 2rem;
}

.contact-method {
    margin-bottom: 1.5rem;
}

.contact-method strong {
    display: block;
    margin-bottom: 0.25rem;
    color: var(--primary-color);
}

.contact-form {
    background-color: #f8fafc;
    padding: 2rem;
    border-radius: var(--border-radius);
}

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

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--text-color);
}

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

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

.success {
    color: var(--success-color);
    font-weight: 500;
    text-align: center;
    padding: 2rem;
}

/* Footer */
.site-footer {
    background-color: #f8fafc;
    border-top: 1px solid var(--border-color);
    padding: 2rem var(--spacing-unit);
    text-align: center;
    color: var(--text-light);
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-links {
        gap: 1rem;
    }

    .nav-link {
        padding: 0.5rem;
        font-size: 0.9rem;
    }

    .hero h1 {
        font-size: 2rem;
    }

    .cta-buttons {
        flex-direction: column;
        align-items: center;
    }

    .contact-content {
        grid-template-columns: 1fr;
    }

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

@media (max-width: 480px) {
    .main-nav {
        flex-direction: column;
        padding: 1rem;
    }

    .nav-brand {
        margin-bottom: 1rem;
    }
}