:root {
    --bg: #f5f6f8;
    --white: #ffffff;
    --ink: #182332;
    --muted: #64748b;
    --blue: #2563eb;
    --border: #e2e8f0;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    background: var(--bg);
    color: var(--ink);
    font: 16px/1.8 Arial, sans-serif;
}

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

.container {
    max-width: 1120px;
    margin: auto;
    padding: 0 24px;
}

header {
    background: var(--white);
    border-bottom: 1px solid var(--border);
}

nav {
    min-height: 85px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
}

.logo {
    font-size: 26px;
    font-weight: 800;
}

.logo span { color: var(--blue); }

.menu { display: flex; gap: 25px; }

.menu a { font-size: 14px; font-weight: 600; }

.hero {
    padding: 110px 0;
    color: white;
    background: linear-gradient(125deg, #14243d, #2563eb);
}

.hero h1 {
    font-size: clamp(38px, 6vw, 68px);
    max-width: 850px;
    line-height: 1.15;
}

.hero p {
    font-size: 20px;
    max-width: 680px;
    color: #dbeafe;
}

section { padding: 75px 0; }

h2 { font-size: 37px; }

.grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.card {
    padding: 32px;
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: 12px;
}

.card:hover { border-color: var(--blue); }

.card h3 { font-size: 23px; }

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

.article {
    max-width: 820px;
    margin: 75px auto;
    padding: 0 24px;
}

.article h1 { font-size: 46px; }
.article p { color: var(--muted); }

footer {
    padding: 40px 0;
    color: white;
    background: var(--ink);
}

@media(max-width: 750px) {
    nav { flex-direction: column; padding: 20px 0; }
    .menu { flex-wrap: wrap; justify-content: center; }
    .grid { grid-template-columns: 1fr; }
}