:root {
    --navy: #071d4d;
    --navy-2: #0d2e73;
    --blue: #2f80ed;
    --cyan: #35c4ee;
    --ink: #17233b;
    --muted: #5d6a81;
    --line: #dce4f0;
    --soft: #f4f7fb;
    --white: #fff;
    --shadow: 0 18px 45px rgba(12, 39, 88, .09);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    margin: 0;
    color: var(--ink);
    background: var(--soft);
    font-family: Arial, Helvetica, sans-serif;
    line-height: 1.65;
}
a { color: var(--navy-2); }
a:hover { color: var(--blue); }
.container { width: min(1120px, calc(100% - 36px)); margin: 0 auto; }
.skip-link { position: absolute; left: -9999px; top: 8px; z-index: 10; padding: 8px 12px; background: #fff; }
.skip-link:focus { left: 8px; }
.site-header { background: var(--navy); color: #fff; border-bottom: 3px solid var(--cyan); }
.header-inner { min-height: 74px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand { color: #fff; display: inline-flex; align-items: center; gap: 11px; text-decoration: none; }
.brand img { width: 156px; height: 42px; object-fit: contain; object-position: left center; }
.brand span { display: grid; line-height: 1.15; }
.brand small { margin-top: 4px; color: #cfe2ff; font-size: .72rem; }
.main-nav { display: flex; flex-wrap: wrap; gap: 18px; align-items: center; }
.main-nav a { color: #fff; text-decoration: none; font-size: .92rem; }
.main-nav a:hover { color: #8eeaff; }
.breadcrumbs { padding-top: 24px; color: var(--muted); font-size: .88rem; }
.breadcrumbs ol { list-style: none; padding: 0; margin: 0; display: flex; flex-wrap: wrap; gap: 7px; }
.breadcrumbs li:not(:last-child)::after { content: '/'; margin-left: 7px; color: #9ba9bd; }
.breadcrumbs a { color: var(--muted); }
.hero { padding: 56px 0 44px; background: linear-gradient(135deg, #071d4d 0%, #0e397f 64%, #0d6c91 100%); color: #fff; }
.hero h1, .article-header h1 { max-width: 820px; margin: 10px 0 16px; font-size: clamp(2rem, 5vw, 3.7rem); line-height: 1.08; letter-spacing: -.035em; }
.hero p { max-width: 740px; margin: 0; color: #dbeaff; font-size: 1.08rem; }
.eyebrow { margin: 0; text-transform: uppercase; letter-spacing: .15em; font-size: .75rem; font-weight: 700; color: var(--cyan); }
.notice { margin-top: 28px; padding: 14px 17px; border: 1px solid rgba(142,234,255,.4); border-radius: 10px; background: rgba(255,255,255,.08); color: #eef8ff; }
.content-section { padding: 46px 0; }
.content-section h2 { margin: 0 0 9px; font-size: clamp(1.45rem, 3vw, 2rem); line-height: 1.2; }
.section-lead { margin-top: 0; color: var(--muted); }
.card-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; margin-top: 25px; }
.card { display: flex; flex-direction: column; padding: 23px; background: var(--white); border: 1px solid var(--line); border-radius: 15px; box-shadow: var(--shadow); }
.card h3 { margin: 0 0 8px; line-height: 1.25; }
.card p { margin: 0 0 18px; color: var(--muted); font-size: .94rem; }
.card .button { margin-top: auto; }
.split-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; margin-top: 20px; }
.mini-card { padding: 18px; border: 1px solid var(--line); border-radius: 12px; background: #fff; }
.mini-card h3 { margin: 0 0 5px; font-size: 1.05rem; }
.mini-card p { margin: 0; color: var(--muted); font-size: .93rem; }
.button { display: inline-flex; justify-content: center; align-items: center; width: fit-content; padding: 10px 15px; border-radius: 8px; background: var(--blue); color: #fff; font-weight: 700; text-decoration: none; }
.button:hover { background: var(--navy-2); color: #fff; }
.button.secondary { background: transparent; color: var(--navy-2); border: 1px solid #a9b9cf; }
.article-header { padding: 36px 0 28px; background: #fff; border-bottom: 1px solid var(--line); }
.article-header h1 { color: var(--ink); font-size: clamp(2rem, 4vw, 3.2rem); }
.article-header .intro { max-width: 820px; margin: 0; color: var(--muted); font-size: 1.08rem; }
.meta { display: flex; flex-wrap: wrap; gap: 10px 20px; margin-top: 19px; color: var(--muted); font-size: .88rem; }
.article-layout { display: grid; grid-template-columns: minmax(0, 1fr) 280px; gap: 32px; padding-top: 38px; padding-bottom: 55px; }
.article-body { min-width: 0; padding: 30px clamp(20px, 4vw, 44px); background: #fff; border: 1px solid var(--line); border-radius: 15px; box-shadow: var(--shadow); }
.article-body h2 { margin: 31px 0 9px; font-size: 1.55rem; line-height: 1.25; }
.article-body h3 { margin: 23px 0 6px; font-size: 1.12rem; line-height: 1.3; }
.article-body h2:first-child { margin-top: 0; }
.article-body p, .article-body ul, .article-body ol { margin-top: 9px; }
.article-body li + li { margin-top: 6px; }
.article-cover { margin: 0 0 28px; }
.article-cover img { display: block; width: 100%; max-width: 100%; height: auto; border-radius: 11px; }
.article-cover figcaption { margin-top: 8px; color: var(--muted); font-size: .86rem; }
.article-body blockquote { margin: 22px 0; padding: 15px 18px; border-left: 4px solid var(--cyan); background: #eef9fc; }
.toc { position: sticky; top: 18px; align-self: start; padding: 20px; background: #fff; border: 1px solid var(--line); border-radius: 12px; }
.toc h2 { margin: 0 0 10px; font-size: 1.05rem; }
.toc ol { margin: 0; padding-left: 20px; font-size: .92rem; }
.toc li + li { margin-top: 6px; }
.callout { padding: 18px; margin: 24px 0; border: 1px solid #c8d9f3; border-radius: 10px; background: #f5f8ff; }
.callout strong { color: var(--navy-2); }
.article-cta { display: flex; flex-wrap: wrap; gap: 10px; padding: 22px 0 4px; }
.faq details { margin: 9px 0; padding: 13px 16px; border: 1px solid var(--line); border-radius: 9px; background: #fbfcfe; }
.faq summary { cursor: pointer; font-weight: 700; }
.faq details p { margin-bottom: 0; }
.source-list { padding-left: 20px; }
.comparison-wrap { overflow-x: auto; margin: 19px 0 25px; }
.comparison { width: 100%; min-width: 650px; border-collapse: collapse; font-size: .94rem; }
.comparison-wide { min-width: 980px; }
.comparison th, .comparison td { padding: 13px 14px; text-align: left; vertical-align: top; border: 1px solid var(--line); }
.comparison th { background: var(--navy); color: #fff; }
.comparison tr:nth-child(even) td { background: #f8faff; }
.site-footer { padding: 38px 0 18px; background: var(--navy); color: #dce8ff; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr; gap: 35px; }
.footer-grid p { margin-top: 0; }
.footer-grid a { display: block; margin: 5px 0; color: #fff; text-decoration: none; }
.footer-bottom { margin-top: 28px; padding-top: 16px; border-top: 1px solid rgba(255,255,255,.18); color: #aec5ec; font-size: .82rem; }

@media (max-width: 820px) {
    .header-inner { align-items: flex-start; padding: 15px 0; flex-direction: column; }
    .main-nav { gap: 12px; }
    .card-grid, .split-grid { grid-template-columns: 1fr; }
    .article-layout { grid-template-columns: 1fr; }
    .toc { position: static; order: -1; }
    .hero { padding-top: 42px; }
}

@media (max-width: 520px) {
    .container { width: min(100% - 24px, 1120px); }
    .article-body { padding: 22px 17px; }
    .hero h1, .article-header h1 { font-size: 2.05rem; }
    .footer-grid { grid-template-columns: 1fr; gap: 15px; }
}