:root {
    --primary-color: #2c3e50;
    --secondary-color: #95a5a6;
    --accent-color: #ecf0f1;
    --text-primary: #2c3e50;
    --text-secondary: #7f8c8d;
    --text-light: #ffffff;
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-dark: #2c3e50;
    --shadow-soft: 0 2px 8px rgba(44, 62, 80, 0.06);
    --shadow-medium: 0 4px 16px rgba(44, 62, 80, 0.1);
    --border-radius-sm: 3px;
    --border-radius-md: 4px;
    --border-radius-lg: 6px;
    --spacing-xs: 1rem;
    --spacing-sm: 2rem;
    --spacing-md: 3.5rem;
    --spacing-lg: 4.8rem;
    --spacing-xl: 6.4rem;
    --transition: all 0.3s ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
    font-weight: 500;
    line-height: 1.2;
    color: var(--text-primary);
}

h1 {
    font-size: clamp(2rem, 4vw, 3.5rem);
    margin-bottom: var(--spacing-sm);
}

h2 {
    font-size: clamp(1.75rem, 3.5vw, 2.75rem);
    margin-bottom: var(--spacing-sm);
}

h3 {
    font-size: clamp(1.25rem, 2.5vw, 1.875rem);
    margin-bottom: var(--spacing-xs);
}

p {
    margin-bottom: var(--spacing-xs);
    color: var(--text-secondary);
}

ul, ol {
    margin-bottom: var(--spacing-xs);
    padding-left: 1.5rem;
    color: var(--text-secondary);
}

ul li, ol li {
    margin-bottom: 0.5rem;
}

a {
    text-decoration: none;
    color: inherit;
    transition: var(--transition);
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

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

.section {
    padding: var(--spacing-lg) 0;
}

.section-dark {
    background-color: var(--bg-dark);
    color: var(--text-light);
}

.section-dark h2,
.section-dark h3,
.section-dark h4 {
    color: var(--text-light);
}

.section-dark p {
    color: rgba(255, 255, 255, 0.9);
}

.section-dark .grid-4 .card h4,
.section-dark .grid-4 .card p {
    color: #000000;
}

.text-center {
    text-align: center;
}

.mb-xs {
    margin-bottom: var(--spacing-xs);
}

.mb-sm {
    margin-bottom: var(--spacing-sm);
}

.mb-md {
    margin-bottom: var(--spacing-md);
}

.mb-lg {
    margin-bottom: var(--spacing-lg);
}

.content-section {
    margin-bottom: var(--spacing-md);
}

header {
    background-color: var(--bg-primary);
    border-bottom: 1px solid var(--accent-color);
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: var(--shadow-soft);
}

.header-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem var(--spacing-sm);
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    min-width: 0;
}

.logo {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    flex-shrink: 1;
    min-width: 0;
}

nav ul {
    display: flex;
    list-style: none;
    gap: var(--spacing-md);
}

nav a {
    color: var(--text-primary);
    font-weight: 400;
    padding: 0.5rem 0;
    border-bottom: 2px solid transparent;
}

nav a:hover {
    border-bottom-color: var(--primary-color);
}

.burger-menu {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
    flex-shrink: 0;
}

.burger-menu span {
    width: 24px;
    height: 2px;
    background-color: var(--text-primary);
    transition: var(--transition);
}

.hero {
    background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-primary) 100%);
    padding: var(--spacing-xl) 0;
    text-align: center;
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 var(--spacing-sm);
}

.hero p {
    font-size: 1.125rem;
    margin-bottom: var(--spacing-md);
    color: var(--text-secondary);
}

.btn {
    display: inline-block;
    padding: 0.875rem 2rem;
    border-radius: var(--border-radius-md);
    font-weight: 500;
    transition: var(--transition);
    border: none;
    cursor: pointer;
    font-size: 1rem;
}

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

.btn-primary:hover {
    background-color: #34495e;
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
}

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

.btn-secondary:hover {
    background-color: var(--text-light);
    color: var(--bg-dark);
}

.grid {
    display: grid;
    gap: var(--spacing-md);
}

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

.grid-3 {
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.grid-4 {
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

.card {
    background-color: var(--bg-primary);
    padding: var(--spacing-md);
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-soft);
    transition: var(--transition);
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-medium);
}

.feature-item {
    text-align: center;
}

.card-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-sm);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
}

.service-card {
    background-color: rgba(255, 255, 255, 0.05);
    padding: var(--spacing-md);
    border-radius: var(--border-radius-md);
    border: 1px solid rgba(255, 255, 255, 0.1);
    transition: var(--transition);
}

.service-card:hover {
    background-color: rgba(255, 255, 255, 0.1);
    transform: translateY(-4px);
}

.service-card h3 {
    color: var(--text-light);
    margin-bottom: var(--spacing-xs);
}

.service-card p {
    color: rgba(255, 255, 255, 0.8);
}

form {
    max-width: 600px;
    margin: 0 auto;
}

.form-group {
    margin-bottom: var(--spacing-sm);
}

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

form input,
form textarea {
    width: 100%;
    padding: 0.875rem;
    border: 1px solid var(--accent-color);
    border-radius: var(--border-radius-md);
    font-size: 1rem;
    font-family: inherit;
    transition: var(--transition);
}

form input:focus,
form textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(44, 62, 80, 0.1);
}

form textarea {
    resize: vertical;
    min-height: 150px;
}

.checkbox-group {
    display: flex;
    align-items: flex-start;
    gap: 0.5rem;
    margin-bottom: var(--spacing-sm);
}

.checkbox-group input[type="checkbox"] {
    width: auto;
    margin-top: 0.25rem;
}

.checkbox-group label {
    font-weight: 400;
    font-size: 0.9rem;
}

footer {
    background-color: var(--bg-dark);
    color: var(--text-light);
    padding: var(--spacing-lg) 0 var(--spacing-sm);
}

.footer-content {
    display: flex;
    flex-wrap: nowrap;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.footer-section {
    flex: 1;
    min-width: 0;
}

.footer-section h4 {
    color: var(--text-light);
    margin-bottom: var(--spacing-xs);
    font-size: 1.125rem;
}

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

.footer-section ul li {
    margin-bottom: 0.5rem;
}

.footer-section a {
    color: rgba(255, 255, 255, 0.8);
    transition: var(--transition);
}

.footer-section a:hover {
    color: var(--text-light);
}

.footer-section p {
    color: rgba(255, 255, 255, 0.8);
    margin-bottom: 0.5rem;
}

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

.footer-bottom p {
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.9rem;
}

@media (max-width: 768px) {
    .header-content {
        padding: 1rem;
    }

    .logo {
        font-size: 1.1rem;
        max-width: calc(100% - 60px);
    }

    .burger-menu {
        display: flex;
    }

    nav {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background-color: var(--bg-primary);
        border-top: 1px solid var(--accent-color);
        box-shadow: var(--shadow-medium);
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.3s ease;
    }

    nav.active {
        max-height: 500px;
    }

    nav ul {
        flex-direction: column;
        padding: var(--spacing-sm);
        gap: 0;
    }

    nav ul li {
        border-bottom: 1px solid var(--accent-color);
    }

    nav ul li:last-child {
        border-bottom: none;
    }

    nav a {
        display: block;
        padding: 1rem 0;
    }

    .grid-2,
    .grid-3,
    .grid-4 {
        grid-template-columns: 1fr;
    }

    .services-grid {
        grid-template-columns: 1fr;
    }

    .section {
        padding: var(--spacing-md) 0;
    }

    .hero {
        padding: var(--spacing-md) 0;
    }

    .footer-content {
        flex-direction: column;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 1rem;
    }

    .header-content {
        padding: 0.75rem 1rem;
    }

    .logo {
        font-size: 1rem;
        max-width: calc(100% - 50px);
    }

    h1 {
        font-size: 1.75rem;
    }

    h2 {
        font-size: 1.5rem;
    }

    .btn {
        padding: 0.75rem 1.5rem;
        font-size: 0.9rem;
    }
}