:root {
    --primary-color: #0066CC;
    --secondary-color: #4F46E5;
    --success-color: #10B981;
    --text-primary: #1F2937;
    --text-secondary: #6B7280;
    --text-light: #9CA3AF;
    --background-light: #F9FAFB;
    --background-white: #FFFFFF;
    --border-color: #E5E7EB;
    --shadow-color: rgba(0, 0, 0, 0.1);
    --shadow-light: rgba(0, 0, 0, 0.05);
    --transition-speed: 0.3s;
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    font-size: 16px;
    line-height: 1.5;
    color: var(--text-primary);
    background-color: var(--background-white);
}

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

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

ul {
    list-style: none;
}

btn, .btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    font-weight: 600;
    border: none;
    border-radius: 0.5rem;
    cursor: pointer;
    transition: all var(--transition-speed);
}

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

.btn--primary:hover {
    background-color: var(--secondary-color);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px var(--shadow-color);
}

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

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

.btn--large {
    padding: 1rem 2rem;
    font-size: 1.125rem;
}

.section {
    padding: var(--spacing-3xl) 0;
}

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

.section__title {
    text-align: center;
    font-size: 2.25rem;
    font-weight: 700;
    margin-bottom: var(--spacing-xl);
    color: var(--text-primary);
}

.header {
    background-color: var(--background-white);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 4px var(--shadow-light);
}

.header__logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.logo-icon {
    font-size: 2rem;
}

.logo-text {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

.nav {
    display: flex;
    gap: var(--spacing-xl);
    align-items: center;
}

.nav__link {
    color: var(--text-primary);
    font-weight: 500;
    transition: color var(--transition-speed);
}

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

.nav__link.active {
    color: var(--primary-color);
}

.auth-btn {
    margin-left: var(--spacing-lg);
}

.menu-toggle {
    display: none;
    font-size: 1.5rem;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-sm);
}

.hero {
    padding: var(--spacing-3xl) 0;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--background-white);
    text-align: center;
}

.hero__title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
}

.hero__subtitle {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-2xl);
    opacity: 0.95;
}

.stats {
    display: flex;
    justify-content: center;
    gap: var(--spacing-2xl);
    flex-wrap: wrap;
    margin-top: var(--spacing-xl);
}

.stat {
    text-align: center;
}

.stat__number {
    font-size: 3rem;
    font-weight: 700;
    display: block;
}

.stat__label {
    font-size: 0.875rem;
    opacity: 0.95;
}

.about__grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-xl);
}

.about__item {
    text-align: center;
    padding: var(--spacing-xl);
    background-color: var(--background-white);
    border-radius: 0.75rem;
    box-shadow: 0 1px 3px var(--shadow-light);
    transition: transform var(--transition-speed), box-shadow var(--transition-speed);
}

.about__item:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px var(--shadow-color);
}

.about__icon {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-md);
}

.about__title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--primary-color);
}

.about__text {
    color: var(--text-secondary);
}

.services__grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-xl);
}

.service-card {
    background-color: var(--background-white);
    padding: var(--spacing-xl);
    border-radius: 0.75rem;
    box-shadow: 0 1px 3px var(--shadow-light);
    transition: transform var(--transition-speed), box-shadow var(--transition-speed);
    border: 1px solid var(--border-color);
}

.service-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px var(--shadow-color);
}

.service-card__icon {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-md);
}

.service-card__title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--primary-color);
}

.service-card__text {
    color: var(--text-secondary);
}

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

.pricing-card {
    background-color: var(--background-white);
    padding: var(--spacing-xl);
    border-radius: 0.75rem;
    box-shadow: 0 1px 3px var(--shadow-light);
    position: relative;
    transition: transform var(--transition-speed), box-shadow var(--transition-speed);
    border: 1px solid var(--border-color);
}

.pricing-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px var(--shadow-color);
}

.pricing-card--professional {
    border: 2px solid var(--primary-color);
    transform: scale(1.05);
}

.pricing-card--professional:hover {
    transform: scale(1.05) translateY(-5px);
}

.pricing-card__popular {
    position: absolute;
    top: -12px;
    right: 20px;
    background-color: var(--success-color);
    color: var(--background-white);
    padding: 0.25rem 1rem;
    border-radius: 1rem;
    font-size: 0.875rem;
    font-weight: 600;
}

.pricing-card__header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.pricing-card__title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.pricing-card__price {
    font-size: 3rem;
    font-weight: 700;
    color: var(--primary-color);
}

.pricing-card__period {
    color: var(--text-secondary);
}

.pricing-card__features {
    margin: var(--spacing-lg) 0;
    padding: 0 var(--spacing-md);
}

.pricing-card__feature {
    padding: var(--spacing-sm) 0;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
}

.pricing-card__feature::before {
    content: "✓";
    color: var(--success-color);
    margin-right: var(--spacing-sm);
    font-weight: 700;
}

.documents__grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-xl);
}

.document-item {
    background-color: var(--background-white);
    padding: var(--spacing-xl);
    border-radius: 0.75rem;
    box-shadow: 0 1px 3px var(--shadow-light);
    border: 1px solid var(--border-color);
}

.document-item__icon {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-md);
}

.document-item__title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--primary-color);
}

.document-item__description {
    color: var(--text-secondary);
}

.check-form {
    background-color: var(--background-white);
    padding: var(--spacing-2xl);
    border-radius: 1rem;
    box-shadow: 0 4px 6px var(--shadow-light);
    max-width: 600px;
    margin: 0 auto;
}

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

.form-label {
    display: block;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.form-input {
    width: 100%;
    padding: 0.75rem 1rem;
    font-size: 1rem;
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    transition: border-color var(--transition-speed), box-shadow var(--transition-speed);
}

.form-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(0, 102, 204, 0.1);
}

.form-input.error {
    border-color: #EF4444;
}

.form-select {
    width: 100%;
    padding: 0.75rem 1rem;
    font-size: 1rem;
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    background-color: var(--background-white);
    cursor: pointer;
    transition: border-color var(--transition-speed), box-shadow var(--transition-speed);
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%236B7280' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 1rem center;
    background-size: 1.25rem;
}

.form-select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(0, 102, 204, 0.1);
}

.form-select.error {
    border-color: #EF4444;
}

.form-error {
    display: block;
    color: #EF4444;
    font-size: 0.875rem;
    margin-top: var(--spacing-xs);
    min-height: 1.25rem;
}

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

.faq-item {
    background-color: var(--background-white);
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    margin-bottom: var(--spacing-md);
    overflow: hidden;
}

.faq-item__question {
    width: 100%;
    padding: var(--spacing-lg) var(--spacing-xl);
    font-size: 1rem;
    font-weight: 600;
    text-align: left;
    background: none;
    border: none;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: background-color var(--transition-speed);
    color: var(--text-primary);
}

.faq-item__question:hover {
    background-color: var(--background-light);
}

.faq-item__question[aria-expanded="true"] {
    background-color: var(--background-light);
    color: var(--primary-color);
}

.faq-item__arrow {
    transition: transform var(--transition-speed);
    color: var(--text-secondary);
}

.faq-item__question[aria-expanded="true"] .faq-item__arrow {
    transform: rotate(180deg);
}

.faq-item__answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-speed) ease-out;
}

.faq-item__answer p {
    padding: 0 var(--spacing-xl) var(--spacing-lg);
    color: var(--text-secondary);
    line-height: 1.6;
}

.faq-item.active .faq-item__answer {
    max-height: 500px;
}

.faq-item.active .faq-item__question {
    border-bottom: 1px solid var(--border-color);
}

.contacts__grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-xl);
}

.contact-item {
    display: flex;
    gap: var(--spacing-md);
    align-items: flex-start;
}

.contact-item__icon {
    font-size: 2rem;
    color: var(--primary-color);
}

.contact-item__content {
    flex: 1;
}

.contact-item__label {
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    color: var(--text-primary);
}

.contact-item__value {
    color: var(--text-secondary);
}

.contact-item__value:hover {
    color: var(--primary-color);
}

.footer {
    background-color: #111827;
    color: var(--background-white);
    padding: var(--spacing-2xl) 0 var(--spacing-xl);
}

.footer__content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.footer__logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.footer__description {
    color: #9CA3AF;
    line-height: 1.6;
}

.footer__title {
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--background-white);
}

.footer__links {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.footer__link {
    color: #9CA3AF;
    transition: color var(--transition-speed);
}

.footer__link:hover {
    color: var(--background-white);
}

.social-links {
    display: flex;
    gap: var(--spacing-md);
}

.social-link {
    color: #9CA3AF;
    padding: 0.5rem 1rem;
    background-color: rgba(255, 255, 255, 0.1);
    border-radius: 0.5rem;
    transition: all var(--transition-speed);
}

.social-link:hover {
    background-color: var(--primary-color);
    color: var(--background-white);
}

.footer__bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: var(--spacing-xl);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.footer__copyright {
    color: #9CA3AF;
}

.footer__legal {
    display: flex;
    gap: var(--spacing-xl);
}

@media (max-width: 1024px) {
    .hero__title {
        font-size: 2rem;
    }
    
    .stats {
        gap: var(--spacing-xl);
    }
}

@media (max-width: 768px) {
    :root {
        --spacing-2xl: 2rem;
        --spacing-3xl: 3rem;
    }
    
    .header {
        padding: var(--spacing-md);
    }
    
    .header__logo {
        flex: 1;
    }
    
    .nav {
        position: fixed;
        top: 60px;
        left: 0;
        right: 0;
        background-color: var(--background-white);
        flex-direction: column;
        padding: var(--spacing-md);
        gap: var(--spacing-md);
        box-shadow: 0 4px 6px var(--shadow-light);
        transform: translateX(100%);
        transition: transform var(--transition-speed);
        z-index: 999;
    }
    
    .nav.active {
        transform: translateX(0);
    }
    
    .nav__link {
        display: block;
        padding: var(--spacing-sm) 0;
    }
    
    .auth-btn {
        display: none;
    }
    
    .menu-toggle {
        display: block;
    }
    
    .hero__title {
        font-size: 1.75rem;
    }
    
    .hero__subtitle {
        font-size: 1rem;
    }
    
    .stats {
        flex-direction: column;
        gap: var(--spacing-lg);
    }
    
    .stat__number {
        font-size: 2rem;
    }
    
    .section__title {
        font-size: 1.75rem;
    }
    
    .check-form {
        padding: var(--spacing-xl);
    }
    
    .footer__bottom {
        flex-direction: column;
        text-align: center;
    }
    
    .footer__legal {
        flex-direction: column;
        gap: var(--spacing-sm);
        align-items: center;
    }
}

@media (max-width: 480px) {
    .hero {
        padding: var(--spacing-2xl) 0;
    }
    
    .hero__title {
        font-size: 1.5rem;
    }
    
    .about__grid,
    .services__grid,
    .pricing__grid,
    .documents__grid,
    .contacts__grid {
        grid-template-columns: 1fr;
    }
    
    .pricing-card--professional {
        transform: scale(1);
    }
    
    .pricing-card--professional:hover {
        transform: scale(1) translateY(-5px);
    }
}