:root {
    color-scheme: light;
    --primary: #0b62d6;
    --primary-dark: #094f9f;
    --bg: #f7f9fc;
    --text: #1f2933;
    --muted: #52606d;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: var(--bg);
    color: var(--text);
}

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

a:hover {
    text-decoration: underline;
}

.container {
    width: min(1100px, 92vw);
    margin: 0 auto;
}

.site-header {
    background: #fff;
    border-bottom: 1px solid rgba(15, 23, 42, 0.08);
    padding: 18px 0 10px;
    box-shadow: 0 10px 30px rgba(15, 23, 42, 0.04);
    position: sticky;
    top: 0;
    z-index: 10;
}

.branding {
    display: flex;
    align-items: center;
    gap: 18px;
}

.branding .logo {
    background: var(--primary);
    color: #fff;
    font-weight: 700;
    font-size: 22px;
    border-radius: 10px;
    padding: 10px 14px;
}

.title-group h1 {
    margin: 0;
    font-size: 22px;
}

.title-group .tagline {
    margin: 4px 0 0;
    color: var(--muted);
}

.main-nav ul {
    list-style: none;
    display: flex;
    gap: 16px;
    margin: 14px 0 0;
    padding: 0;
    flex-wrap: wrap;
}

.main-nav li a {
    display: block;
    padding: 8px 12px;
    border-radius: 6px;
    font-weight: 500;
    color: var(--text);
}

.main-nav li.active a,
.main-nav li a:hover {
    background: var(--primary);
    color: #fff;
}

main {
    padding: 32px 0 48px;
}

.page {
    background: #fff;
    padding: 32px;
    border-radius: 16px;
    box-shadow: 0 20px 40px rgba(15, 23, 42, 0.08);
    line-height: 1.6;
}

.page h1,
.page h2,
.page h3 {
    color: var(--primary-dark);
}

.site-footer {
    background: #0f172a;
    color: #cbd5f5;
    padding: 32px 0;
    text-align: center;
}

.site-footer a {
    color: #a5b4fc;
}

@media (max-width: 640px) {
    .branding {
        flex-direction: column;
        align-items: flex-start;
    }

    .main-nav ul {
        width: 100%;
    }

    .main-nav li {
        flex: 1 1 auto;
    }

    .page {
        padding: 24px;
    }
}