* { box-sizing: border-box; }
:root {
    --blue: #3f8fe5;
    --blue-dark: #2875c7;
    --blue-light: #eaf4ff;
    --bg-light: #f4f7fb;
    --bg-soft: #eef3f9;
    --text: #34495e;
    --title: #1f2d3d;
    --muted: #6f7f90;
    --line: #d8e4f0;
    --shadow: 0 12px 32px rgba(43,97,153,0.10);
}
html { scroll-behavior: smooth; }
body {
    margin: 0;
    background: #ffffff;
    color: var(--text);
    font-family: Arial, "Microsoft YaHei", sans-serif;
    line-height: 1.7;
    overflow-x: hidden;
}
body.drawer-open { overflow: hidden; }
a { color: inherit; }
img { max-width: 100%; }
button, a { -webkit-tap-highlight-color: transparent; }
button:focus-visible, a:focus-visible { outline: 3px solid rgba(63,143,229,.36); outline-offset: 3px; }
.skip-link { position: fixed; left: 16px; top: -60px; z-index: 12000; background: #fff; color: var(--blue-dark); padding: 10px 16px; border: 1px solid var(--line); border-radius: 8px; text-decoration: none; }
.skip-link:focus { top: 12px; }
.container { width: min(1160px, calc(100% - 40px)); margin: 0 auto; }
.narrow { width: min(860px, calc(100% - 40px)); margin: 0 auto; }
.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 { flex: 0 0 auto; display: inline-flex; align-items: center; }
.site-logo img { display: block; max-height: 44px; width: auto; }
.nav-core { display: flex; align-items: center; justify-content: center; gap: 6px; min-width: 0; }
.nav-core a { color: var(--text); text-decoration: none; padding: 8px 9px; border-radius: 8px; white-space: nowrap; font-size: 15px; }
.nav-core a:hover, .nav-core a.active { color: var(--blue-dark); background: var(--blue-light); }
.header-actions { display: flex; align-items: center; gap: 10px; flex: 0 0 auto; }
.main-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 44px;
    padding: 0 22px;
    color: #ffffff;
    background: var(--blue);
    border: 1px solid var(--blue);
    border-radius: 8px;
    text-decoration: none;
    box-shadow: 0 10px 24px rgba(63,143,229,0.22);
    position: relative;
    z-index: 2;
    pointer-events: auto;
    touch-action: manipulation;
    font-weight: 700;
    transition: .2s ease;
}
.main-btn:hover { background: #2f7fd3; border-color: #2f7fd3; transform: translateY(-1px); }
.main-btn:active { transform: translateY(0); }
.secondary-btn { display: inline-flex; align-items: center; justify-content: center; min-height: 44px; padding: 0 20px; color: var(--blue-dark); background: #fff; border: 1px solid var(--line); border-radius: 8px; text-decoration: none; font-weight: 700; }
.secondary-btn:hover { background: var(--blue-light); border-color: #9bc9f4; }
.menu-toggle { width: 46px; height: 46px; border: 1px solid var(--line); border-radius: 9px; background: #fff; display: inline-flex; flex-direction: column; justify-content: center; align-items: center; gap: 5px; cursor: pointer; position: relative; z-index: 2; }
.menu-toggle span { display: block; width: 20px; height: 2px; background: var(--title); border-radius: 2px; }
.drawer-overlay { position: fixed; inset: 0; z-index: 10000; background: rgba(23,43,64,.46); opacity: 0; transition: opacity .22s ease; }
.drawer-overlay.visible { opacity: 1; }
.site-drawer { position: fixed; top: 0; right: 0; z-index: 10001; width: min(390px, 88vw); height: 100vh; background: #fff; box-shadow: -12px 0 36px rgba(31,45,61,.18); transform: translateX(105%); transition: transform .24s ease; padding: 22px; overflow-y: auto; }
.site-drawer.open { transform: translateX(0); }
.drawer-head { display: flex; justify-content: space-between; align-items: center; padding-bottom: 18px; border-bottom: 1px solid #e5edf5; }
.drawer-close { width: 44px; height: 44px; border: 1px solid var(--line); background: #fff; border-radius: 50%; color: var(--title); font-size: 28px; cursor: pointer; }
.drawer-nav { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; margin: 18px 0; }
.drawer-nav a { text-decoration: none; padding: 10px 12px; border-radius: 8px; background: var(--bg-light); color: var(--text); }
.drawer-nav a:hover { color: var(--blue-dark); background: var(--blue-light); }
.drawer-download { width: 100%; }
.hero { position: relative; overflow: hidden; padding: 72px 0 58px; background: linear-gradient(180deg, #ffffff 0%, #f7fbff 100%); }
.hero::before { content: ""; position: absolute; width: 420px; height: 420px; border-radius: 50%; background: rgba(63,143,229,.08); top: -180px; right: -120px; }
.hero-grid { display: grid; grid-template-columns: 1.04fr .96fr; gap: 64px; align-items: center; position: relative; }
.eyebrow { margin: 0 0 12px; color: var(--blue-dark); font-weight: 700; letter-spacing: .08em; font-size: 14px; text-transform: uppercase; }
h1, h2, h3, .section-title { color: var(--title); }
h1 { margin: 0 0 18px; font-size: clamp(38px, 5vw, 62px); line-height: 1.12; letter-spacing: -.03em; }
.hero-subtitle { margin: 0 0 18px; color: var(--blue-dark); font-size: clamp(20px, 2.7vw, 28px); line-height: 1.45; font-weight: 700; }
.hero-copy { margin: 0; font-size: 17px; color: var(--muted); }
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 28px; }
.hero-links { display: flex; flex-wrap: wrap; gap: 16px; margin-top: 22px; }
.hero-links a, .text-link { color: #2f83d8; text-decoration: none; font-weight: 700; }
.hero-links a:hover, .text-link:hover { text-decoration: underline; }
.hero-points { display: flex; flex-wrap: wrap; gap: 9px; padding: 0; margin: 24px 0 0; list-style: none; }
.hero-points li { padding: 7px 10px; border: 1px solid #cfe2f5; background: #fff; border-radius: 7px; color: #47637d; font-size: 14px; }
.hero-visual { display: flex; align-items: center; justify-content: center; min-height: 440px; }
.hero-visual img, .feature-image img, .content-img { max-width: 100%; height: auto; object-fit: contain; display: block; }
.hero-visual img { max-height: 520px; filter: drop-shadow(0 24px 32px rgba(43,97,153,.18)); }
.section { padding: 78px 0; }
.section-light { background: var(--bg-light); }
.section-soft { background: var(--bg-soft); }
.section-heading { max-width: 760px; margin: 0 auto 38px; text-align: center; }
.section-heading.left { text-align: left; margin-left: 0; }
.section-heading h2 { margin: 0 0 12px; font-size: clamp(29px, 4vw, 42px); line-height: 1.2; }
.section-heading p { margin: 0; color: var(--muted); font-size: 17px; }
.info-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.category-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; }
.category-card, .info-card, .review-card, .faq-card, .article-card, .notice-card {
    background: #ffffff;
    border: 1px solid var(--line);
    border-radius: 8px;
    box-shadow: 0 8px 24px rgba(43,97,153,0.06);
}
.info-card { padding: 24px; }
.info-card h3 { margin: 0 0 8px; font-size: 20px; }
.info-card p { margin: 0; color: var(--muted); }
.category-card { display: flex; flex-direction: column; min-height: 196px; padding: 28px; border-color: #c8ddf1; transition: .2s ease; }
.category-card:hover { transform: translateY(-4px); border-color: var(--blue); box-shadow: 0 12px 24px rgba(43,97,153,.10); }
.category-card h3 { margin: 0 0 9px; color: var(--blue-dark); font-size: 23px; }
.category-card p { margin: 0 0 18px; color: var(--muted); flex: 1; }
.category-card.full { grid-column: 1 / -1; min-height: 150px; }
.feature-split { display: grid; grid-template-columns: .92fr 1.08fr; gap: 64px; align-items: center; }
.feature-split.reverse { grid-template-columns: 1.08fr .92fr; }
.feature-split.reverse .feature-image { order: 2; }
.feature-copy h2 { margin: 0 0 16px; font-size: clamp(30px, 4vw, 43px); line-height: 1.2; }
.feature-copy p { color: var(--muted); font-size: 16.5px; }
.feature-copy .main-btn, .feature-copy .secondary-btn { margin-top: 12px; }
.feature-image { display: flex; justify-content: center; align-items: center; }
.feature-image img { max-height: 430px; }
.dual-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 30px; }
.article-card { padding: 30px; }
.article-card h3 { margin: 0 0 12px; font-size: 25px; }
.article-card p { margin: 0 0 16px; color: var(--muted); }
.article-card img { max-height: 210px; margin: 0 auto 22px; }
.triple-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.review-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.review-card { padding: 25px; }
.review-card p { margin: 0 0 18px; color: #53697f; }
.review-card span { color: var(--blue-dark); font-weight: 700; }
.faq-list { display: grid; gap: 14px; }
.faq-card { padding: 22px 24px; }
.faq-card h3 { margin: 0 0 8px; font-size: 19px; }
.faq-card p { margin: 0; color: var(--muted); }
.safety-box { padding: 34px; border: 1px solid #bcd9f4; background: #f8fcff; border-radius: 9px; }
.safety-box h2 { margin-top: 0; }
.safety-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; margin-top: 22px; }
.safety-grid div { padding: 18px; background: #fff; border: 1px solid var(--line); border-radius: 8px; }
.page-hero { padding: 64px 0 54px; background: linear-gradient(180deg, #f7fbff 0%, #fff 100%); border-bottom: 1px solid #e5edf5; }
.breadcrumb { color: var(--muted); font-size: 14px; margin-bottom: 15px; }
.breadcrumb a { color: var(--blue-dark); text-decoration: none; }
.page-hero h1 { font-size: clamp(34px, 5vw, 54px); }
.page-hero p { max-width: 760px; margin: 0; color: var(--muted); font-size: 18px; }
.article-layout { display: grid; grid-template-columns: minmax(0, 1fr) 290px; gap: 42px; align-items: start; }
.article-content h2 { margin: 44px 0 14px; font-size: 30px; scroll-margin-top: 100px; }
.article-content h2:first-child { margin-top: 0; }
.article-content h3 { margin: 26px 0 10px; font-size: 22px; }
.article-content p { margin: 0 0 16px; }
.article-content ul, .article-content ol { padding-left: 24px; }
.article-content li { margin-bottom: 9px; }
.article-content .callout { margin: 24px 0; padding: 20px 22px; border-left: 4px solid var(--blue); background: var(--blue-light); border-radius: 0 8px 8px 0; }
.article-content .risk-callout { margin: 24px 0; padding: 20px 22px; border: 1px solid #c5dff6; background: #f8fcff; border-radius: 8px; }
.toc { position: sticky; top: 96px; padding: 22px; background: var(--bg-light); border: 1px solid var(--line); border-radius: 8px; }
.toc h2 { margin: 0 0 12px; font-size: 19px; }
.toc a { display: block; color: var(--text); text-decoration: none; padding: 6px 0; border-bottom: 1px solid #e2eaf2; }
.toc a:last-child { border-bottom: 0; }
.toc a:hover { color: var(--blue-dark); }
.steps { counter-reset: step; display: grid; gap: 16px; }
.step { position: relative; padding: 22px 22px 22px 70px; border: 1px solid var(--line); border-radius: 8px; background: #fff; }
.step::before { counter-increment: step; content: counter(step); position: absolute; left: 22px; top: 22px; width: 32px; height: 32px; border-radius: 50%; display: grid; place-items: center; background: var(--blue); color: #fff; font-weight: 700; }
.step h3 { margin-top: 0; }
.notice-list { display: grid; gap: 18px; }
.notice-card { padding: 25px; }
.notice-meta { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 9px; color: var(--blue-dark); font-size: 14px; font-weight: 700; }
.notice-card h2 { margin: 0 0 10px; font-size: 24px; }
.notice-card p { margin: 0; color: var(--muted); }
.tag { display: inline-flex; padding: 4px 9px; border-radius: 999px; background: var(--blue-light); color: var(--blue-dark); font-size: 13px; font-weight: 700; }
.service-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 22px; }
.service-card { padding: 24px; border: 1px solid var(--line); background: #fff; border-radius: 8px; }
.service-card h2, .service-card h3 { margin-top: 0; }
.cta-panel { display: flex; align-items: center; justify-content: space-between; gap: 24px; padding: 34px; border-radius: 10px; background: var(--blue); color: #fff; }
.cta-panel h2 { margin: 0 0 8px; color: #fff; }
.cta-panel p { margin: 0; color: rgba(255,255,255,.86); }
.cta-panel .secondary-btn { flex: 0 0 auto; border-color: #fff; }
.site-footer { background: #438ddf; color: #fff; padding: 56px 0 0; }
.footer-grid { display: grid; grid-template-columns: 1.6fr repeat(3, 1fr); gap: 36px; }
.footer-brand img { max-height: 48px; width: auto; filter: brightness(0) invert(1); }
.footer-brand p { color: rgba(255,255,255,.84); max-width: 420px; }
.footer-links h2 { margin: 0 0 13px; color: #fff; font-size: 18px; }
.footer-links a { display: block; color: rgba(255,255,255,.86); text-decoration: none; padding: 4px 0; }
.footer-links a:hover { color: #fff; text-decoration: underline; }
.footer-risk { margin-top: 38px; padding: 20px 0; border-top: 1px solid rgba(255,255,255,.22); border-bottom: 1px solid rgba(255,255,255,.22); color: rgba(255,255,255,.88); }
.footer-bottom { padding: 20px 0 28px; color: rgba(255,255,255,.76); font-size: 14px; }
@media (max-width: 1080px) {
    .nav-core { display: none; }
    .info-grid { grid-template-columns: repeat(2, 1fr); }
    .hero-grid, .feature-split, .feature-split.reverse { gap: 40px; }
    .article-layout { grid-template-columns: 1fr; }
    .toc { position: static; order: -1; }
}
@media (max-width: 860px) {
    .header-inner { min-height: 64px; }
    .site-logo img { max-height: 38px; }
    .hero { padding: 50px 0; }
    .hero-grid, .feature-split, .feature-split.reverse { grid-template-columns: 1fr; }
    .feature-split.reverse .feature-image { order: 0; }
    .hero-visual { min-height: auto; }
    .hero-visual img { max-height: 440px; }
    .category-grid { grid-template-columns: repeat(2, 1fr); }
    .category-card.full { grid-column: 1 / -1; }
    .dual-grid, .review-grid, .triple-grid { grid-template-columns: 1fr 1fr; }
    .safety-grid { grid-template-columns: 1fr 1fr; }
    .footer-grid { grid-template-columns: 1.5fr 1fr 1fr; }
    .footer-grid > :last-child { grid-column: 2 / -1; }
}
@media (max-width: 640px) {
    .container, .narrow { width: min(100% - 32px, 1160px); }
    .header-inner { padding: 0 12px; gap: 8px; }
    .site-logo img { max-height: 34px; max-width: 126px; }
    .header-actions { gap: 7px; }
    .header-download { min-height: 44px; padding: 0 13px; font-size: 14px; }
    .menu-toggle { width: 44px; height: 44px; }
    h1 { font-size: 36px; }
    .hero-subtitle { font-size: 21px; }
    .hero-actions { display: grid; grid-template-columns: 1fr; }
    .hero-actions a { width: 100%; }
    .hero-links { gap: 10px 15px; }
    .section { padding: 58px 0; }
    .section-heading { margin-bottom: 28px; }
    .info-grid, .category-grid, .dual-grid, .review-grid, .triple-grid, .service-grid, .safety-grid { grid-template-columns: 1fr; }
    .category-card.full { grid-column: auto; }
    .feature-image img { max-height: 320px; }
    .drawer-nav { grid-template-columns: 1fr; }
    .article-content h2 { font-size: 27px; }
    .cta-panel { align-items: stretch; flex-direction: column; }
    .footer-grid { grid-template-columns: 1fr 1fr; }
    .footer-brand { grid-column: 1 / -1; }
    .footer-grid > :last-child { grid-column: auto; }
}
@media (max-width: 420px) {
    .site-logo img { max-width: 108px; }
    .header-download { padding: 0 10px; }
    .hero { padding-top: 40px; }
    .site-drawer { padding: 18px; }
    .footer-grid { grid-template-columns: 1fr; }
    .footer-brand, .footer-grid > :last-child { grid-column: auto; }
}