:root {
    --bg-color: #ffffff;
    --bg-gray: #F5F5F7;
    --text-main: #111111;
    --text-secondary: #555555;
    --accent: #2563EB;
    --border-color: #E5E5E5;
    
    --font-main: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    
    --container-width: 1200px;
    --spacing-section: 120px;
}

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

body {
    font-family: var(--font-main);
    color: var(--text-main);
    background-color: var(--bg-color);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

h1, h2, h3 {
    font-weight: 600;
    letter-spacing: -0.02em;
}

a {
    text-decoration: none;
    color: inherit;
    transition: color 0.2s ease;
}

.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 24px;
}

.btn {
    display: inline-block;
    padding: 12px 28px;
    font-size: 14px;
    font-weight: 500;
    border-radius: 6px;
    transition: all 0.2s;
    cursor: pointer;
}

.btn--outline {
    border: 1px solid var(--border-color);
    background: transparent;
    color: var(--text-main);
}

.btn--outline:hover {
    border-color: var(--text-main);
    background: var(--text-main);
    color: white;
}

.btn--primary {
    background: var(--text-main);
    color: white;
    border: 1px solid var(--text-main);
}

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

.link-arrow {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-main);
    border-bottom: 1px solid transparent;
}

.link-arrow:hover {
    border-bottom-color: var(--text-main);
}

.header {
    height: 80px;
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
}

.header__container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
}

.logo {
    font-weight: 700;
    font-size: 20px;
    letter-spacing: -0.03em;
}

.nav {
    display: flex;
    align-items: center;
    gap: 40px;
}

.nav__link {
    font-size: 14px;
    color: var(--text-secondary);
}

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

.hero {
    padding: 140px 0 100px;
}

.hero__title {
    font-size: clamp(40px, 5vw, 72px);
    line-height: 1.1;
    margin-bottom: 32px;
}

.hero__subtitle {
    font-size: 18px;
    color: var(--text-secondary);
    max-width: 600px;
    font-weight: 400;
}

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

.section__header {
    margin-bottom: 60px;
    display: flex;
    align-items: center;
    gap: 20px;
}

.section__title {
    font-size: 24px;
    white-space: nowrap;
}

.section__line {
    height: 1px;
    background: var(--border-color);
    width: 100%;
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 30px;
}

.card {
    background: white;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 40px;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    transition: transform 0.2s, border-color 0.2s;
}

.card:hover {
    border-color: var(--text-secondary);
    transform: translateY(-4px);
}

.card__top {
    margin-bottom: 24px;
}

.card__tag {
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
    background: var(--bg-gray);
    padding: 6px 10px;
    border-radius: 4px;
}

.card__title {
    font-size: 20px;
    margin-bottom: 12px;
}

.card__text {
    font-size: 16px;
    color: var(--text-secondary);
    margin-bottom: 30px;
    flex-grow: 1;
}

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

.container--flex {
    display: flex;
    justify-content: space-between;
    gap: 60px;
    align-items: flex-start;
}

.text-block {
    flex: 1;
}

.text-body {
    margin-bottom: 24px;
    font-size: 18px;
    color: var(--text-secondary);
}

.stats-block {
    display: flex;
    gap: 40px;
}

.stat-num {
    display: block;
    font-size: 48px;
    font-weight: 600;
    line-height: 1;
    margin-bottom: 8px;
}

.stat-desc {
    font-size: 14px;
    color: var(--text-secondary);
    text-transform: uppercase;
}

.footer {
    padding: 100px 0 40px;
    border-top: 1px solid var(--border-color);
}

.footer__grid {
    display: flex;
    flex-direction: column;
    gap: 80px;
}

.footer__heading {
    font-size: 32px;
    margin-bottom: 20px;
}

.footer__desc {
    color: var(--text-secondary);
    max-width: 500px;
    margin-bottom: 30px;
    font-size: 18px;
}

.footer__bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 40px;
    border-top: 1px solid var(--border-color);
}

.copyright {
    font-size: 14px;
    color: var(--text-secondary);
}

.footer__links {
    display: flex;
    gap: 24px;
}

.footer__links a {
    font-size: 14px;
    color: var(--text-main);
    font-weight: 500;
}

@media (max-width: 768px) {
    .container--flex {
        flex-direction: column;
    }
    
    .nav {
        display: none;
    }
    
    .hero__title {
        font-size: 40px;
    }
    
    .footer__bottom {
        flex-direction: column;
        gap: 20px;
        align-items: flex-start;
    }
}

.page-hero {
    padding: 100px 0 80px;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 80px;
}

.page-label {
    display: block;
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
    margin-bottom: 16px;
}

.page-title {
    font-size: 48px;
    margin-bottom: 24px;
    line-height: 1.1;
}

.page-subtitle {
    font-size: 18px;
    color: var(--text-secondary);
    max-width: 650px;
}

.dir-row {
    display: grid;
    grid-template-columns: 300px 1fr;
    gap: 40px;
    padding-bottom: 80px;
    margin-bottom: 80px;
    border-bottom: 1px solid var(--border-color);
}

.dir-row:last-child {
    border-bottom: none;
    margin-bottom: 0;
}

.dir-num {
    display: block;
    font-family: monospace;
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 12px;
}

.dir-title {
    font-size: 24px;
    font-weight: 500;
}

.tech-list {
    list-style: none;
    margin: 30px 0;
    padding: 0;
}

.tech-list li {
    font-size: 16px;
    color: var(--text-main);
    padding: 8px 0;
    border-bottom: 1px dashed var(--border-color);
}

.tech-list li:last-child {
    border-bottom: none;
}

.dir-action {
    margin-top: 30px;
}

.pt-0 {
    padding-top: 0;
}

@media (max-width: 768px) {
    .dir-row {
        grid-template-columns: 1fr;
        gap: 20px;
        padding-bottom: 60px;
        margin-bottom: 60px;
    }

    .page-title {
        font-size: 36px;
    }
}