:root {
    --bg: #f4f6fa;
    --surface: #ffffff;
    --text: #172033;
    --muted: #687386;
    --accent: #3978e8;
    --dark: #101827;
    --border: #e5e9f0;
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    font-family: Arial, Helvetica, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.65;
}

a {
    color: inherit;
    text-decoration: none;
}

.container {
    width: min(1120px, calc(100% - 40px));
    margin: 0 auto;
}

.header {
    background: var(--dark);
    color: #fff;
}

.header-inner {
    min-height: 76px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 17px;
    font-weight: 700;
}

.logo-icon {
    display: grid;
    place-items: center;
    width: 40px;
    height: 40px;
    border-radius: 10px;
    background: var(--accent);
    font-size: 14px;
}

.nav {
    display: flex;
    gap: 28px;
    color: #c7d0df;
    font-size: 14px;
}

.nav a:hover {
    color: #fff;
}

.hero {
    background: linear-gradient(120deg, #101827, #1b3154);
    color: #fff;
    padding: 100px 0 110px;
}

.hero-content {
    max-width: 1120px;
}

.eyebrow {
    color: var(--accent);
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 2px;
}

.hero .eyebrow {
    color: #8fb7ff;
}

h1 {
    max-width: 780px;
    margin: 20px 0;
    font-size: clamp(34px, 5vw, 54px);
    line-height: 1.15;
    letter-spacing: -1.5px;
}

.hero p {
    max-width: 620px;
    margin-bottom: 30px;
    color: #c4cede;
    font-size: 18px;
}

.primary-button {
    display: inline-block;
    padding: 13px 23px;
    border-radius: 7px;
    background: var(--accent);
    color: #fff;
    font-weight: 700;
    transition: background .2s;
}

.primary-button:hover {
    background: #2864cc;
}

.section {
    padding: 85px 0;
}

.section-heading {
    margin-bottom: 38px;
}

h2 {
    margin: 10px 0;
    font-size: 32px;
    line-height: 1.25;
}

.section-heading p {
    color: var(--muted);
}

.cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 22px;
}

.card {
    padding: 28px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    transition: transform .2s, box-shadow .2s;
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 30px rgba(20, 35, 60, .08);
}

.card-icon {
    display: grid;
    place-items: center;
    width: 44px;
    height: 44px;
    border-radius: 9px;
    background: #eaf1ff;
    color: var(--accent);
    font-weight: 700;
}

.card h3 {
    margin: 20px 0 10px;
    font-size: 19px;
    line-height: 1.35;
}

.card p {
    min-height: 78px;
    color: var(--muted);
    font-size: 14px;
}

.card a {
    color: var(--accent);
    font-size: 14px;
    font-weight: 700;
}

.card a span {
    margin-left: 5px;
}

.about {
    padding: 65px 0;
    background: #eaf0f8;
}

.about-inner {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.about-inner p {
    color: var(--muted);
}

.footer {
    padding: 25px 0;
    background: var(--dark);
    color: #aeb9ca;
    font-size: 13px;
}

.footer-inner {
    display: flex;
    justify-content: space-between;
    gap: 20px;
}

@media (max-width: 800px) {
    .cards {
        grid-template-columns: repeat(2, 1fr);
    }

    .about-inner {
        grid-template-columns: 1fr;
        gap: 15px;
    }

    .hero {
        padding: 75px 0;
    }
}

@media (max-width: 560px) {
    .header-inner {
        padding: 15px 0;
        align-items: flex-start;
        flex-direction: column;
    }

    .nav {
        gap: 20px;
    }

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

    .card p {
        min-height: auto;
    }

    .section {
        padding: 60px 0;
    }

    .footer-inner {
        flex-direction: column;
        gap: 5px;
    }
}


/* Навигация документации */
.nav {
    flex-wrap: wrap;
    align-items: center;
}

.nav a {
    transition: color .2s;
}

.nav a[aria-current="page"] {
    color: #fff;
    font-weight: 700;
}

.breadcrumbs {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 10px;
    padding: 22px 0 0;
    color: var(--muted);
    font-size: 14px;
}

.breadcrumbs a {
    color: var(--accent);
}

.breadcrumbs a:hover {
    text-decoration: underline;
}

.breadcrumbs [aria-current="page"] {
    color: var(--text);
}

.section-nav {
    margin: 45px 0 25px;
    padding: 24px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
}

.section-nav strong {
    display: block;
    margin-bottom: 14px;
}

.section-nav-links {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.section-nav-links a {
    display: inline-block;
    padding: 8px 13px;
    border: 1px solid var(--border);
    border-radius: 7px;
    color: var(--accent);
    font-size: 14px;
}

.section-nav-links a:hover,
.section-nav-links a[aria-current="page"] {
    background: #eaf1ff;
    border-color: var(--accent);
}

@media (max-width: 560px) {
    .nav {
        gap: 10px 16px;
    }

    .section-nav {
        padding: 18px;
    }

    .section-nav-links {
        gap: 8px;
    }
}

/* Единое оформление страниц документации */

/* Заголовочный блок раздела */
.container > .hero {
    margin: 8px 0 40px;
    padding: 55px 40px;
    border-radius: 12px;
}

.container > .hero h1 {
    margin: 0 0 20px;
}

.container > .hero p {
    margin: 0;
}

/* Карточки материалов */
.content {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px;
    padding-bottom: 15px;
}

.content > h2 {
    grid-column: 1 / -1;
    margin: 0 0 5px;
}

.content article {
    margin: 0;
    padding: 24px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    transition: transform .2s, box-shadow .2s;
}

.content article:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 25px rgba(20, 35, 60, .07);
}

.content article h3 {
    margin: 0 0 12px;
    font-size: 19px;
    line-height: 1.4;
}

.content article p {
    margin: 0;
    color: var(--muted);
    font-size: 15px;
}

/* Мобильное отображение */
@media (max-width: 560px) {
    .container > .hero {
        padding: 38px 24px;
        margin-bottom: 30px;
    }

    .content {
        grid-template-columns: 1fr;
        gap: 14px;
    }

    .content article {
        padding: 20px;
    }
}