:root {
    --blue: #3f8fe5;
    --blue-dark: #2875c7;
    --blue-soft: #eaf4ff;
    --text: #34495e;
    --title: #1f2d3d;
    --muted: #6f7f90;
    --line: #d8e4f0;
    --light: #f4f7fb;
    --light-2: #eef3f9;
    --shadow: 0 12px 32px rgba(43,97,153,0.10);
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    margin: 0;
    background: #ffffff;
    color: var(--text);
    font-family: Arial, "Microsoft YaHei", sans-serif;
    line-height: 1.75;
    overflow-x: hidden;
}
body.drawer-open { overflow: hidden; }
a { color: #2f83d8; }
a:focus-visible, button:focus-visible { outline: 3px solid rgba(63,143,229,.42); outline-offset: 3px; }
img { max-width: 100%; }
.skip-link { position: fixed; left: 16px; top: -80px; z-index: 20000; background: #fff; padding: 10px 16px; border: 1px solid var(--blue); border-radius: 8px; }
.skip-link:focus { top: 10px; }
.container { width: min(1160px, calc(100% - 40px)); margin-inline: auto; }
.narrow { width: min(880px, calc(100% - 40px)); margin-inline: auto; }
.section { padding: 84px 0; }
.section-sm { padding: 54px 0; }
.section-light { background: var(--light); }
.section-blue-soft { background: var(--blue-soft); }
h1, h2, h3, .section-title { color: var(--title); line-height: 1.25; margin-top: 0; }
h1 { font-size: clamp(2.2rem, 5vw, 4.25rem); letter-spacing: -.04em; }
h2 { font-size: clamp(1.65rem, 3vw, 2.5rem); }
h3 { font-size: 1.15rem; }
p { margin: 0 0 1.15em; }
.lead { font-size: clamp(1.03rem, 2vw, 1.22rem); color: var(--muted); }
.eyebrow { display: inline-flex; align-items: center; min-height: 32px; padding: 0 12px; color: var(--blue-dark); background: var(--blue-soft); border: 1px solid #cfe5fb; border-radius: 999px; font-weight: 700; font-size: .88rem; margin-bottom: 18px; }
.section-heading { max-width: 760px; margin-bottom: 38px; }
.section-heading.center { margin-inline: auto; text-align: center; }
.section-heading p { color: var(--muted); }
.site-header {
    position: sticky;
    top: 0;
    width: 100%;
    z-index: 9999;
    background: rgba(255,255,255,0.94);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid #e5edf5;
    box-shadow: 0 6px 20px rgba(43,97,153,0.08);
}
.header-inner { max-width: 1240px; min-height: 70px; margin: 0 auto; padding: 0 20px; display: flex; align-items: center; justify-content: space-between; gap: 18px; }
.site-logo { display: inline-flex; flex: 0 0 auto; }
.site-logo img { display: block; max-height: 44px; width: auto; object-fit: contain; }
.nav-core { display: flex; align-items: center; justify-content: center; gap: 8px; white-space: nowrap; }
.nav-core a { color: var(--text); text-decoration: none; padding: 8px 10px; border-radius: 8px; font-size: .95rem; }
.nav-core a:hover, .nav-core a.active { color: var(--blue-dark); background: var(--blue-soft); }
.header-actions { display: flex; align-items: center; gap: 10px; flex: 0 0 auto; }
.main-btn, .secondary-btn {
    display: inline-flex; align-items: center; justify-content: center; min-height: 44px; padding: 0 22px; border-radius: 8px; text-decoration: none; font-weight: 700; position: relative; z-index: 2; pointer-events: auto; touch-action: manipulation; transition: .2s ease;
}
.main-btn { color: #ffffff; background: var(--blue); box-shadow: 0 10px 24px rgba(63,143,229,0.22); }
.main-btn:hover { color: #fff; background: #2f7fd3; transform: translateY(-1px); }
.secondary-btn { color: var(--blue-dark); background: #fff; border: 1px solid #bcd9f4; }
.secondary-btn:hover { border-color: var(--blue); background: var(--blue-soft); transform: translateY(-1px); }
.text-link { color: #2f83d8; font-weight: 700; text-decoration: none; }
.text-link:hover { text-decoration: underline; }
.menu-btn, .drawer-close { border: 0; background: transparent; cursor: pointer; color: var(--title); }
.menu-btn { width: 44px; height: 44px; display: inline-grid; place-content: center; gap: 5px; border-radius: 8px; }
.menu-btn:hover { background: var(--blue-soft); }
.menu-btn span { width: 22px; height: 2px; background: currentColor; border-radius: 2px; }
.drawer-overlay { position: fixed; inset: 0; z-index: 9998; background: rgba(31,45,61,.42); opacity: 0; transition: opacity .22s ease; }
.drawer-overlay.show { opacity: 1; }
.site-drawer { position: fixed; top: 0; right: 0; z-index: 10000; width: min(390px, 90vw); height: 100dvh; padding: 22px; background: #fff; box-shadow: -20px 0 50px rgba(31,45,61,.18); transform: translateX(102%); transition: transform .24s ease; overflow-y: auto; }
.site-drawer.open { transform: translateX(0); }
.drawer-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding-bottom: 18px; border-bottom: 1px solid #e5edf5; }
.drawer-close { width: 44px; height: 44px; font-size: 2rem; line-height: 1; border-radius: 8px; }
.drawer-close:hover { background: var(--blue-soft); }
.drawer-nav { display: grid; gap: 6px; padding-top: 18px; }
.drawer-nav > a:not(.main-btn) { min-height: 44px; display: flex; align-items: center; padding: 9px 12px; color: var(--text); text-decoration: none; border-radius: 8px; }
.drawer-nav > a:hover, .drawer-nav > a.active { color: var(--blue-dark); background: var(--blue-soft); }
.drawer-download { margin-top: 12px; }
.hero { position: relative; overflow: hidden; padding: 78px 0 82px; background: linear-gradient(180deg, #fff 0%, #f7fbff 100%); }
.hero::before, .hero::after { content: ""; position: absolute; border-radius: 50%; background: rgba(63,143,229,.08); pointer-events: none; }
.hero::before { width: 380px; height: 380px; left: -180px; top: -170px; }
.hero::after { width: 460px; height: 460px; right: -250px; bottom: -260px; }
.hero-grid { position: relative; z-index: 1; display: grid; grid-template-columns: 1.05fr .95fr; gap: 60px; align-items: center; }
.hero-copy p { max-width: 700px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin: 28px 0 22px; }
.hero-links { display: flex; flex-wrap: wrap; gap: 18px; margin-bottom: 28px; }
.hero-points { display: grid; grid-template-columns: repeat(2, minmax(0,1fr)); gap: 10px 18px; padding: 0; margin: 0; list-style: none; }
.hero-points li { position: relative; padding-left: 22px; color: var(--muted); }
.hero-points li::before { content: ""; position: absolute; left: 0; top: .75em; width: 8px; height: 8px; border-radius: 50%; background: var(--blue); box-shadow: 0 0 0 5px var(--blue-soft); }
.hero-visual { display: flex; justify-content: center; }
.hero-visual img { width: min(100%, 510px); height: auto; object-fit: contain; display: block; filter: drop-shadow(0 24px 34px rgba(43,97,153,.16)); }
.info-grid { display: grid; grid-template-columns: repeat(4, minmax(0,1fr)); gap: 20px; }
.category-grid { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: 30px; }
.category-card:last-child { grid-column: 1 / -1; }
.category-card, .info-card, .review-card, .faq-card, .content-card { background: #ffffff; border: 1px solid var(--line); border-radius: 8px; box-shadow: 0 8px 24px rgba(43,97,153,0.06); }
.category-card { min-height: 210px; display: flex; flex-direction: column; padding: 28px; transition: .2s ease; }
.category-card:hover { border-color: var(--blue); transform: translateY(-4px); }
.category-card p { color: var(--muted); flex: 1; }
.info-card { padding: 24px; }
.info-card h3 { color: var(--blue-dark); }
.content-split { display: grid; grid-template-columns: 1fr 1fr; gap: 64px; align-items: center; }
.content-split.reverse .feature-image { order: 2; }
.feature-image { display: flex; align-items: center; justify-content: center; min-height: 320px; padding: 28px; background: #fff; border: 1px solid var(--line); border-radius: 16px; box-shadow: var(--shadow); }
.feature-image img, .content-img { max-width: 100%; height: auto; object-fit: contain; display: block; }
.content-list { padding-left: 20px; }
.content-list li { margin-bottom: 9px; }
.dual-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 30px; }
.content-card { padding: 30px; }
.content-card .feature-image { min-height: 220px; margin-bottom: 24px; box-shadow: none; }
.notice-grid, .review-grid, .faq-grid { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: 22px; }
.notice-card { padding: 24px; background: #fff; border-left: 4px solid var(--blue); border-radius: 0 8px 8px 0; box-shadow: 0 8px 24px rgba(43,97,153,.07); }
.notice-card small { color: var(--blue-dark); font-weight: 700; }
.review-card { padding: 24px; }
.review-card blockquote { margin: 0; color: var(--text); }
.review-card cite { display: block; margin-top: 16px; color: var(--muted); font-style: normal; font-size: .92rem; }
.faq-card { overflow: hidden; }
.faq-card details { padding: 0 22px; }
.faq-card summary { min-height: 64px; display: flex; align-items: center; cursor: pointer; color: var(--title); font-weight: 700; }
.faq-card details p { padding-bottom: 20px; color: var(--muted); }
.risk-box { padding: 30px; border: 1px solid #bdd9f2; border-radius: 12px; background: #f7fbff; }
.inner-hero { padding: 62px 0; background: linear-gradient(180deg,#fff,#f4f8fc); border-bottom: 1px solid #e5edf5; }
.inner-hero h1 { font-size: clamp(2rem,4vw,3.35rem); margin-bottom: 18px; }
.breadcrumb { margin-bottom: 18px; color: var(--muted); font-size: .92rem; }
.breadcrumb a { text-decoration: none; }
.article { font-size: 1.02rem; }
.article h2 { margin-top: 2.2em; scroll-margin-top: 100px; }
.article h3 { margin-top: 1.7em; }
.article table { width: 100%; border-collapse: collapse; margin: 24px 0; }
.article th, .article td { padding: 14px; border: 1px solid var(--line); text-align: left; vertical-align: top; }
.article th { background: var(--light); color: var(--title); }
.step-list { counter-reset: steps; list-style: none; padding: 0; }
.step-list li { counter-increment: steps; position: relative; padding: 0 0 24px 56px; }
.step-list li::before { content: counter(steps); position: absolute; left: 0; top: 0; width: 36px; height: 36px; display: grid; place-items: center; border-radius: 50%; background: var(--blue); color: #fff; font-weight: 700; }
.callout { margin: 28px 0; padding: 22px 24px; border-left: 4px solid var(--blue); background: var(--blue-soft); border-radius: 0 8px 8px 0; }
.warning { border-left-color: #df8b2e; background: #fff8ef; }
.tag-list { display: flex; flex-wrap: wrap; gap: 10px; padding: 0; list-style: none; }
.tag-list li { padding: 6px 12px; background: var(--blue-soft); border-radius: 999px; color: var(--blue-dark); font-weight: 700; font-size: .88rem; }
.site-footer { background: #438ddf; color: #fff; padding: 62px 0 24px; }
.footer-grid { display: grid; grid-template-columns: 1.5fr repeat(3,1fr); gap: 42px; }
.site-footer h2 { color: #fff; font-size: 1rem; margin-bottom: 18px; }
.site-footer a { color: #fff; text-decoration: none; display: block; margin-bottom: 10px; opacity: .94; }
.site-footer a:hover { text-decoration: underline; opacity: 1; }
.footer-brand p { max-width: 440px; opacity: .9; }
.footer-logo { display: inline-flex !important; padding: 8px 12px; background: #fff; border-radius: 8px; margin-bottom: 18px !important; }
.footer-risk { margin-top: 38px; padding-top: 24px; border-top: 1px solid rgba(255,255,255,.26); font-size: .92rem; opacity: .94; }
.footer-bottom { margin-top: 22px; font-size: .9rem; opacity: .82; }
.download-page { min-height: 100vh; display: grid; place-items: center; padding: 24px; background: var(--light); }
.download-panel { width: min(560px, 100%); padding: 44px; text-align: center; background: #fff; border: 1px solid var(--line); border-radius: 16px; box-shadow: var(--shadow); }
.download-panel img { max-height: 52px; width: auto; margin-bottom: 22px; }
.download-panel .main-btn { margin-top: 10px; }
@media (max-width: 1050px) {
    .nav-core { display: none; }
    .info-grid { grid-template-columns: repeat(2,minmax(0,1fr)); }
    .notice-grid, .review-grid { grid-template-columns: repeat(2,minmax(0,1fr)); }
    .footer-grid { grid-template-columns: 1.4fr 1fr 1fr; }
    .footer-grid > div:last-child { grid-column: 2 / -1; }
}
@media (max-width: 820px) {
    .section { padding: 66px 0; }
    .hero { padding: 56px 0 64px; }
    .hero-grid, .content-split, .dual-grid { grid-template-columns: 1fr; gap: 38px; }
    .content-split.reverse .feature-image { order: 0; }
    .hero-copy { text-align: center; }
    .hero-actions, .hero-links { justify-content: center; }
    .hero-points { text-align: left; max-width: 560px; margin-inline: auto; }
    .hero-visual img { width: min(100%, 430px); }
    .category-grid { grid-template-columns: repeat(2,minmax(0,1fr)); }
    .category-card:last-child { grid-column: 1 / -1; }
    .faq-grid { grid-template-columns: 1fr; }
}
@media (max-width: 620px) {
    .container, .narrow { width: min(100% - 32px, 1160px); }
    .header-inner { min-height: 62px; padding: 0 12px; gap: 8px; }
    .site-logo img { max-height: 36px; max-width: 132px; }
    .header-actions { gap: 6px; }
    .header-download { min-height: 44px; padding: 0 13px; font-size: .88rem; }
    .hero-actions { display: grid; }
    .hero-actions .main-btn, .hero-actions .secondary-btn { width: 100%; }
    .hero-links { gap: 10px 14px; }
    .hero-points, .info-grid, .category-grid, .notice-grid, .review-grid, .footer-grid { grid-template-columns: 1fr; }
    .category-card:last-child { grid-column: auto; }
    .category-card { min-height: 0; }
    .feature-image { min-height: 240px; padding: 18px; }
    .footer-grid > div:last-child { grid-column: auto; }
    .download-panel { padding: 34px 22px; }
    .article { font-size: 1rem; }
    .article table { display: block; overflow-x: auto; }
}