:root {
    --font: "Plus Jakarta Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    --bg: #090b10;
    --header-bg: #090b10;
    --surface: #141824;
    --text: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --border: #232838;
    --primary: #818cf8;
    --primary-hover: #6366f1;
}

*,
*::before,
*::after {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    font-family: var(--font);
    background: var(--bg);
    color: var(--text);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
}

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

a:hover {
    color: var(--primary-hover);
}

.wrap {
    width: min(800px, calc(100% - 40px));
    margin: 0 auto;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 10;
    height: 68px;
    background: var(--header-bg);
    border-bottom: 1px solid var(--border);
}

.header-inner {
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--text);
    font-weight: 800;
    letter-spacing: -0.03em;
}

.logo img {
    width: 32px;
    height: 32px;
}

.guide-nav {
    display: flex;
    flex-wrap: wrap;
    justify-content: flex-end;
    gap: 8px 14px;
    font-size: 0.8125rem;
    font-weight: 600;
}

.guide-nav a {
    color: var(--text-secondary);
}

.guide-nav a:hover,
.guide-nav a[aria-current="page"] {
    color: var(--primary);
}

.article {
    padding: 40px 0 64px;
}

.article h1 {
    margin: 0 0 16px;
    font-size: clamp(1.75rem, 4vw, 2.35rem);
    line-height: 1.2;
    letter-spacing: -0.03em;
}

.lead {
    margin: 0 0 28px;
    color: var(--text-secondary);
    font-size: 1.0625rem;
}

.article h2 {
    margin: 32px 0 12px;
    font-size: 1.35rem;
    letter-spacing: -0.02em;
}

.article h3 {
    margin: 20px 0 8px;
    font-size: 1.05rem;
}

.article p,
.article li {
    color: var(--text-secondary);
}

.article ul,
.article ol {
    padding-left: 1.2rem;
}

.article li {
    margin: 6px 0;
}

.cta {
    display: inline-flex;
    margin: 8px 0 8px;
    padding: 12px 20px;
    border-radius: 12px;
    background: linear-gradient(135deg, var(--primary) 0%, #7c3aed 100%);
    color: #fff;
    font-weight: 700;
}

.cta:hover {
    color: #fff;
    filter: brightness(1.05);
}

.related {
    display: grid;
    gap: 10px;
    margin-top: 12px;
}

.related a {
    display: block;
    padding: 12px 14px;
    border: 1px solid var(--border);
    border-radius: 12px;
    background: var(--surface);
    color: var(--text);
    font-weight: 600;
}

.faq details {
    margin: 8px 0;
    padding: 12px 14px;
    border: 1px solid var(--border);
    border-radius: 12px;
    background: var(--surface);
}

.faq summary {
    cursor: pointer;
    font-weight: 700;
}

.faq details p {
    margin: 10px 0 0;
}

.site-footer {
    padding: 24px 0 36px;
    border-top: 1px solid var(--border);
    color: var(--text-muted);
    font-size: 0.8125rem;
}

.site-footer p {
    margin: 0 0 10px;
}

.site-footer nav {
    display: flex;
    flex-wrap: wrap;
    gap: 8px 14px;
}

@media (max-width: 700px) {
    .header-inner {
        flex-direction: column;
        align-items: flex-start;
        justify-content: center;
        height: auto;
        padding: 12px 0;
    }

    .site-header {
        height: auto;
    }

    .guide-nav {
        justify-content: flex-start;
    }
}