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

:root {
    --color-black: #000000;
    --color-white: #ffffff;
    --color-gray-50: #fafafa;
    --color-gray-100: #f3f3f3;
    --color-gray-200: #e8e8e8;
    --color-gray-400: #9ca3af;
    --color-gray-600: #4b5563;
    --spacing-xs: 8px;
    --spacing-sm: 16px;
    --spacing-md: 24px;
    --spacing-lg: 48px;
    --spacing-xl: 72px;
    --transition: all 0.3s ease;
    --radius: 8px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', sans-serif;
    line-height: 1.6;
    color: var(--color-gray-600);
    background-color: var(--color-white);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.content-narrow {
    max-width: 800px;
}

header {
    background-color: var(--color-white);
    border-bottom: 1px solid var(--color-gray-100);
    position: sticky;
    top: 0;
    z-index: 1000;
    backdrop-filter: blur(10px);
    background-color: rgba(255, 255, 255, 0.95);
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px var(--spacing-md);
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
}

.logo-placeholder {
    width: 40px;
    height: 40px;
    background-color: var(--color-black);
    color: var(--color-white);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 10px;
    font-weight: 700;
    border-radius: var(--radius);
}

.brand-name {
    font-size: 20px;
    font-weight: 600;
    color: var(--color-black);
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 32px;
}

.nav-links a {
    color: var(--color-gray-600);
    text-decoration: none;
    font-weight: 500;
    font-size: 14px;
    transition: var(--transition);
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--color-black);
    transition: width 0.3s ease;
}

.nav-links a:hover::after,
.nav-links a.active::after {
    width: 100%;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--color-black);
}

.hero {
    padding: 100px var(--spacing-md);
    text-align: center;
    background: linear-gradient(135deg, var(--color-black) 0%, #1a1a1a 100%);
    color: var(--color-white);
}

.hero h1 {
    font-size: 56px;
    font-weight: 700;
    margin-bottom: 16px;
    line-height: 1.2;
}

.hero-subtitle {
    font-size: 18px;
    margin-bottom: 48px;
    opacity: 0.85;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.cta-buttons {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

.btn {
    padding: 12px 32px;
    border-radius: var(--radius);
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
    display: inline-block;
    border: none;
    cursor: pointer;
    font-size: 14px;
}

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

.btn-primary:hover {
    background-color: var(--color-gray-100);
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
}

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

.btn-secondary:hover {
    background-color: var(--color-white);
    color: var(--color-black);
    transform: translateY(-2px);
}

.features {
    padding: var(--spacing-xl) 0;
    background-color: var(--color-white);
}

.features h2 {
    font-size: 40px;
    text-align: center;
    margin-bottom: var(--spacing-lg);
    font-weight: 700;
    color: var(--color-black);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 32px;
}

.feature-card {
    padding: 40px 32px;
    border: none;
    border-radius: var(--radius);
    background-color: var(--color-gray-50);
    transition: var(--transition);
}

.feature-card:hover {
    background-color: var(--color-black);
    color: var(--color-white);
    transform: translateY(-8px);
    box-shadow: 0 16px 40px rgba(0, 0, 0, 0.1);
}

.feature-icon {
    font-size: 14px;
    margin-bottom: 16px;
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--color-gray-200);
    border-radius: var(--radius);
}

.feature-card:hover .feature-icon {
    background-color: rgba(255, 255, 255, 0.1);
}

.feature-card h3 {
    font-size: 20px;
    margin-bottom: 12px;
    font-weight: 600;
    color: var(--color-black);
}

.feature-card:hover h3 {
    color: var(--color-white);
}

.feature-card p {
    font-size: 14px;
    color: var(--color-gray-600);
    line-height: 1.6;
}

.feature-card:hover p {
    color: rgba(255, 255, 255, 0.85);
}

.how-it-works {
    padding: var(--spacing-xl) 0;
    background-color: var(--color-gray-50);
}

.how-it-works h2 {
    font-size: 40px;
    text-align: center;
    margin-bottom: var(--spacing-lg);
    font-weight: 700;
    color: var(--color-black);
}

.steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 32px;
}

.step {
    text-align: center;
    padding: 32px;
}

.step-number {
    width: 64px;
    height: 64px;
    background-color: var(--color-black);
    color: var(--color-white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    font-weight: 700;
    margin: 0 auto 20px;
}

.step h3 {
    font-size: 20px;
    margin-bottom: 12px;
    font-weight: 600;
    color: var(--color-black);
}

.step p {
    font-size: 14px;
    color: var(--color-gray-600);
    line-height: 1.6;
}

.cta-section {
    padding: 80px var(--spacing-md);
    text-align: center;
    background: linear-gradient(135deg, var(--color-black) 0%, #1a1a1a 100%);
    color: var(--color-white);
}

.cta-section h2 {
    font-size: 40px;
    margin-bottom: 16px;
    font-weight: 700;
}

.cta-section p {
    font-size: 18px;
    margin-bottom: 32px;
    opacity: 0.85;
}

.page-header {
    padding: 80px var(--spacing-md);
    text-align: center;
    background: linear-gradient(135deg, var(--color-black) 0%, #1a1a1a 100%);
    color: var(--color-white);
}

.page-header h1 {
    font-size: 44px;
    margin-bottom: 12px;
    font-weight: 700;
}

.page-header p {
    opacity: 0.85;
    font-size: 16px;
}

.last-updated {
    opacity: 0.7;
    font-size: 14px;
}

.content-section {
    padding: 64px var(--spacing-md);
}

.content-block {
    margin-bottom: 48px;
}

.content-block h2 {
    font-size: 28px;
    margin-bottom: 16px;
    font-weight: 600;
    color: var(--color-black);
}

.content-block p {
    margin-bottom: 14px;
    font-size: 15px;
    line-height: 1.7;
    color: var(--color-gray-600);
}

.content-block ul {
    margin-left: 24px;
    margin-bottom: 14px;
}

.content-block li {
    margin-bottom: 10px;
    font-size: 15px;
    color: var(--color-gray-600);
    line-height: 1.6;
}

.content-block a {
    color: var(--color-black);
    text-decoration: none;
    font-weight: 600;
    border-bottom: 2px solid var(--color-black);
    transition: opacity 0.3s ease;
}

.content-block a:hover {
    opacity: 0.7;
}

.contact-intro {
    margin-bottom: 48px;
    text-align: center;
}

.contact-intro p {
    margin-bottom: 12px;
    font-size: 15px;
    color: var(--color-gray-600);
}

.contact-note {
    font-weight: 600;
    background-color: var(--color-gray-100);
    padding: 16px;
    border-left: 4px solid var(--color-black);
    border-radius: var(--radius);
    font-size: 14px;
    color: var(--color-gray-600);
}

.contact-form {
    background-color: var(--color-gray-50);
    padding: 48px;
    border-radius: var(--radius);
    border: none;
}

.form-group {
    margin-bottom: 24px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    font-size: 14px;
    color: var(--color-black);
}

.required {
    color: var(--color-black);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--color-gray-200);
    border-radius: var(--radius);
    font-size: 14px;
    font-family: inherit;
    background-color: var(--color-white);
    transition: var(--transition);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-black);
    box-shadow: 0 0 0 3px rgba(0, 0, 0, 0.05);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

.contact-form .btn {
    width: 100%;
    cursor: pointer;
    border: none;
}

.form-message {
    margin-top: 24px;
    padding: 16px;
    border-radius: var(--radius);
    text-align: center;
    font-weight: 600;
    font-size: 14px;
}

.form-message.success {
    background-color: var(--color-black);
    color: var(--color-white);
    border: none;
}

.form-message.error {
    background-color: #fff3cd;
    color: #856404;
    border: 1px solid #ffeeba;
}

footer {
    background-color: var(--color-black);
    color: var(--color-white);
    padding: 64px var(--spacing-md) 32px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 48px;
    margin-bottom: 32px;
}

.footer-section h4 {
    margin-bottom: 16px;
    font-size: 16px;
    font-weight: 600;
}

.footer-section p {
    opacity: 0.7;
    font-size: 14px;
    line-height: 1.6;
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: 10px;
}

.footer-section a {
    color: var(--color-white);
    text-decoration: none;
    opacity: 0.7;
    transition: var(--transition);
    font-size: 14px;
}

.footer-section a:hover {
    opacity: 1;
}

.footer-bottom {
    text-align: center;
    padding-top: 24px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-bottom p {
    opacity: 0.5;
    font-size: 13px;
}

@media (max-width: 768px) {
    .nav-links {
        flex-direction: column;
        gap: 16px;
    }

    .hero {
        padding: 64px var(--spacing-md);
    }

    .hero h1 {
        font-size: 36px;
    }

    .hero-subtitle {
        font-size: 16px;
    }

    .features h2,
    .how-it-works h2,
    .cta-section h2,
    .page-header h1 {
        font-size: 32px;
    }

    .features-grid,
    .steps {
        grid-template-columns: 1fr;
        gap: 24px;
    }

    .cta-buttons {
        flex-direction: column;
    }

    .btn {
        width: 100%;
    }

    .contact-form {
        padding: 32px 24px;
    }

    .feature-card,
    .step {
        padding: 24px;
    }

    .page-header {
        padding: 56px var(--spacing-md);
    }

    .content-section {
        padding: 48px var(--spacing-md);
    }
}