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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: #2c3e50;
    background: #ffffff;
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Header */
.site-header {
    background: #ffffff;
    border-bottom: 1px solid #e1e8ed;
    padding: 20px 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

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

.logo {
    font-size: 20px;
    font-weight: 600;
    color: #1a1a1a;
    letter-spacing: -0.02em;
}

.nav {
    display: flex;
    gap: 32px;
}

.nav a {
    color: #4a5568;
    text-decoration: none;
    font-size: 15px;
    font-weight: 500;
    transition: color 0.2s;
}

.nav a:hover {
    color: #2c3e50;
}

/* Hero */
.hero {
    padding: 80px 0 100px;
    background: #fafbfc;
}

.hero h1 {
    font-size: 42px;
    font-weight: 600;
    line-height: 1.2;
    color: #1a1a1a;
    margin-bottom: 24px;
    max-width: 900px;
    letter-spacing: -0.02em;
}

.hero-subtitle {
    font-size: 20px;
    line-height: 1.6;
    color: #4a5568;
    margin-bottom: 24px;
    max-width: 800px;
}

.hero-note {
    font-size: 16px;
    line-height: 1.6;
    color: #718096;
    margin-bottom: 32px;
    max-width: 750px;
}

/* Sections */
.section {
    padding: 80px 0;
}

.section-alt {
    background: #fafbfc;
}

.section h2 {
    font-size: 32px;
    font-weight: 600;
    color: #1a1a1a;
    margin-bottom: 32px;
    letter-spacing: -0.01em;
}

.section h3 {
    font-size: 20px;
    font-weight: 600;
    color: #2c3e50;
    margin-bottom: 12px;
}

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

.content-block p {
    font-size: 17px;
    line-height: 1.7;
    color: #4a5568;
    margin-bottom: 20px;
}

/* Principles */
.principles {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 40px;
    margin-top: 48px;
}

.principle p {
    font-size: 16px;
    line-height: 1.6;
    color: #4a5568;
}

/* Audience */
.audience-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 40px;
    margin-top: 48px;
}

.audience-item p {
    font-size: 16px;
    line-height: 1.6;
    color: #4a5568;
}

/* Engagement steps */
.engagement-steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 40px;
    margin-top: 48px;
}

.step p {
    font-size: 16px;
    line-height: 1.6;
    color: #4a5568;
}

/* Contact */
.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    margin-top: 32px;
}

.contact-info p {
    font-size: 16px;
    line-height: 1.6;
    color: #4a5568;
    margin-bottom: 20px;
}

.contact-note {
    font-size: 14px;
    color: #718096;
    margin-top: 32px;
}

/* Form */
.contact-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.contact-form label {
    display: flex;
    flex-direction: column;
    font-size: 14px;
    font-weight: 500;
    color: #2c3e50;
    gap: 6px;
}

.contact-form input,
.contact-form textarea {
    padding: 10px 12px;
    border: 1px solid #cbd5e0;
    border-radius: 4px;
    font-size: 15px;
    font-family: inherit;
    color: #2c3e50;
    background: #ffffff;
}

.contact-form input:focus,
.contact-form textarea:focus {
    outline: none;
    border-color: #4a5568;
}

.contact-form textarea {
    resize: vertical;
    min-height: 100px;
}

/* Buttons */
.btn-primary {
    display: inline-block;
    padding: 12px 28px;
    background: #2c3e50;
    color: #ffffff;
    text-decoration: none;
    font-size: 15px;
    font-weight: 500;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    transition: background 0.2s;
}

.btn-primary:hover {
    background: #1a252f;
}

.form-status {
    font-size: 14px;
    color: #4a5568;
}

/* Footer */
.site-footer {
    background: #fafbfc;
    border-top: 1px solid #e1e8ed;
    padding: 40px 0;
}

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

.site-footer p {
    font-size: 14px;
    color: #718096;
}

.footer-links {
    display: flex;
    gap: 24px;
}

.footer-links a {
    font-size: 14px;
    color: #718096;
    text-decoration: none;
}

.footer-links a:hover {
    color: #4a5568;
}

/* Responsive */
@media (max-width: 768px) {
    .nav {
        display: none;
    }

    .hero h1 {
        font-size: 32px;
    }

    .hero-subtitle {
        font-size: 18px;
    }

    .section h2 {
        font-size: 28px;
    }

    .contact-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .principles,
    .audience-list,
    .engagement-steps {
        grid-template-columns: 1fr;
    }

    .site-footer .container {
        flex-direction: column;
        gap: 16px;
        text-align: center;
    }
}