:root {
    --paper: #f7f3ea;
    --vermilion: #c0392b;
    --navy: #2c3e50;
    --ink: #2a2a2a;
    --card: #ffffff;
    --line: #ded7ca;
    --muted: #6e6a64;
    --soft-red: #f5e3de;
    --soft-navy: #e7edf1;
    --shadow: 0 12px 32px rgba(44, 62, 80, 0.08);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    margin: 0;
    background: var(--paper);
    color: var(--ink);
    font-family: "Noto Sans SC", "Microsoft YaHei", Arial, sans-serif;
    line-height: 1.75;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
.container { width: min(1120px, calc(100% - 40px)); margin: 0 auto; }
.site-header {
    position: sticky;
    top: 0;
    z-index: 20;
    background: rgba(247, 243, 234, 0.96);
    border-bottom: 1px solid var(--line);
    backdrop-filter: blur(8px);
}
.nav-wrap { min-height: 74px; display: flex; align-items: center; gap: 32px; }
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 800; letter-spacing: .02em; color: var(--navy); }
.brand img { width: 38px; height: 38px; border-radius: 8px; }
.brand-word { font-size: 1.1rem; }
.site-nav { display: flex; align-items: center; gap: 22px; margin-left: auto; font-size: .95rem; }
.site-nav a { color: var(--navy); padding: 8px 0; border-bottom: 2px solid transparent; }
.site-nav a:hover, .site-nav a[aria-current="page"] { color: var(--vermilion); border-color: var(--vermilion); }
.nav-cta, .button { display: inline-flex; align-items: center; justify-content: center; gap: 8px; border: 0; cursor: pointer; font: inherit; font-weight: 700; }
.nav-cta { padding: 9px 16px; border-radius: 6px; color: #fff !important; background: var(--vermilion); border-bottom: 0 !important; }
.menu-toggle { display: none; border: 1px solid var(--line); background: var(--card); color: var(--navy); width: 42px; height: 38px; border-radius: 6px; }
.hero { padding: 86px 0 74px; border-bottom: 1px solid var(--line); }
.hero-grid { display: grid; grid-template-columns: 1.1fr .9fr; gap: 64px; align-items: center; }
.eyebrow { display: inline-flex; align-items: center; gap: 8px; color: var(--vermilion); font-size: .83rem; font-weight: 800; letter-spacing: .12em; text-transform: uppercase; }
.eyebrow::before { content: ""; width: 28px; height: 2px; background: var(--vermilion); }
h1, h2, h3 { margin: 0; line-height: 1.25; letter-spacing: 0; color: var(--navy); }
h1 { font-size: clamp(2.25rem, 5vw, 4.25rem); max-width: 690px; margin-top: 18px; }
h2 { font-size: clamp(1.75rem, 3vw, 2.6rem); }
h3 { font-size: 1.15rem; }
.hero-copy { max-width: 650px; font-size: 1.08rem; color: #514b45; margin: 24px 0 30px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; }
.button { padding: 12px 20px; border-radius: 6px; transition: transform .2s ease, box-shadow .2s ease; }
.button:hover { transform: translateY(-2px); box-shadow: 0 8px 20px rgba(44,62,80,.14); }
.button-primary { background: var(--vermilion); color: #fff; }
.button-ghost { background: var(--card); border: 1px solid var(--navy); color: var(--navy); }
.hero-note { margin: 15px 0 0; color: var(--muted); font-size: .88rem; }
.hero-art { position: relative; min-height: 380px; display: grid; place-items: center; }
.hero-art::before { content: ""; position: absolute; width: 310px; height: 310px; border: 1px solid rgba(192,57,43,.28); border-radius: 50%; }
.phone { position: relative; width: 224px; border: 7px solid var(--navy); border-radius: 28px; background: var(--card); padding: 14px 12px 16px; box-shadow: var(--shadow); transform: rotate(4deg); }
.phone::before { content: ""; display: block; width: 54px; height: 5px; border-radius: 99px; background: var(--navy); margin: 0 auto 14px; }
.phone-screen { background: #fbfaf7; border: 1px solid var(--line); border-radius: 12px; padding: 12px; }
.screen-bar { display: flex; justify-content: space-between; color: var(--vermilion); font-size: .7rem; font-weight: 800; margin-bottom: 12px; }
.screen-cover { height: 146px; border-radius: 8px; background: linear-gradient(135deg, #2c3e50 0 55%, #c0392b 55% 100%); display: grid; place-items: end start; padding: 12px; color: #fff; font-size: .9rem; font-weight: 800; }
.screen-lines { display: grid; gap: 7px; margin-top: 12px; }
.screen-lines span { height: 7px; border-radius: 3px; background: #d6d0c7; }
.screen-lines span:nth-child(2) { width: 78%; }
.screen-lines span:nth-child(3) { width: 56%; }
.section { padding: 86px 0; }
.section-head { display: flex; justify-content: space-between; align-items: end; gap: 24px; margin-bottom: 30px; }
.section-head p { max-width: 480px; margin: 0; color: var(--muted); }
.kicker { color: var(--vermilion); font-size: .8rem; letter-spacing: .14em; font-weight: 800; margin-bottom: 12px; }
.category-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
.category { background: var(--card); border: 1px solid var(--line); border-top: 3px solid var(--vermilion); padding: 22px; min-height: 168px; box-shadow: 0 8px 24px rgba(44,62,80,.04); transition: transform .2s ease; }
.category:nth-child(even) { border-top-color: var(--navy); }
.category:hover { transform: translateY(-4px); }
.category-icon { width: 36px; height: 36px; display: grid; place-items: center; border-radius: 50%; background: var(--soft-red); color: var(--vermilion); font-weight: 900; margin-bottom: 14px; }
.category:nth-child(even) .category-icon { background: var(--soft-navy); color: var(--navy); }
.category p { margin: 8px 0 0; color: var(--muted); font-size: .92rem; }
.stats { background: var(--navy); color: #fff; padding: 34px 0; }
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.stat { border-left: 1px solid rgba(255,255,255,.25); padding-left: 22px; }
.stat strong { display: block; font-size: 2rem; line-height: 1.1; color: #fff; }
.stat span { color: #dce5e9; font-size: .9rem; }
.showcase-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; align-items: start; }
.showcase-card { background: var(--card); border: 1px solid var(--line); padding: 14px; }
.showcase-card img { width: 100%; max-width: 400px; margin: 0 auto; border-radius: 6px; border: 1px solid var(--line); }
.showcase-card figcaption { padding: 13px 4px 3px; color: var(--muted); font-size: .9rem; }
.offline-band { background: var(--soft-red); border-top: 1px solid #e6c1b9; border-bottom: 1px solid #e6c1b9; }
.offline-grid { display: grid; grid-template-columns: .9fr 1.1fr; gap: 56px; align-items: center; }
.feature-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px; margin: 28px 0 0; }
.feature { background: rgba(255,255,255,.78); border: 1px solid rgba(192,57,43,.2); padding: 16px; }
.feature strong { display: block; color: var(--navy); margin-bottom: 4px; }
.feature span { color: #655d58; font-size: .9rem; }
.download-panel { background: var(--navy); color: #fff; padding: 34px; border-radius: 8px; }
.download-panel h3 { color: #fff; }
.download-panel p { color: #d9e1e5; margin: 14px 0 22px; }
.download-panel .button-primary { background: var(--vermilion); }
.link-arrow { display: inline-flex; align-items: center; gap: 8px; color: var(--vermilion); font-weight: 800; margin-top: 18px; }
.deep-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; }
.deep-card { background: var(--card); border: 1px solid var(--line); padding: 26px; position: relative; overflow: hidden; }
.deep-card::after { content: ""; position: absolute; right: -20px; top: -20px; width: 90px; height: 90px; border: 1px solid rgba(192,57,43,.28); border-radius: 50%; }
.deep-card p { color: var(--muted); margin: 10px 0 0; }
.quote-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.quote { background: var(--card); border: 1px solid var(--line); padding: 24px; }
.quote p { margin: 0; font-size: 1.02rem; color: #47423d; }
.quote cite { display: block; margin-top: 18px; color: var(--vermilion); font-style: normal; font-size: .88rem; font-weight: 800; }
.faq-list { border-top: 1px solid var(--line); }
.faq-item { border-bottom: 1px solid var(--line); }
.faq-item summary { cursor: pointer; list-style: none; padding: 19px 0; font-weight: 800; color: var(--navy); display: flex; justify-content: space-between; gap: 20px; }
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after { content: "+"; color: var(--vermilion); font-size: 1.3rem; line-height: 1; }
.faq-item[open] summary::after { content: "−"; }
.faq-item p { margin: 0 0 18px; color: var(--muted); max-width: 850px; }
.cta-band { padding: 66px 0; background: var(--vermilion); color: #fff; }
.cta-wrap { display: flex; justify-content: space-between; align-items: center; gap: 28px; }
.cta-wrap h2 { color: #fff; }
.cta-wrap p { margin: 10px 0 0; color: #f9e7e3; }
.cta-wrap .button-primary { background: #fff; color: var(--vermilion); }
.article-hero { padding: 76px 0 48px; border-bottom: 1px solid var(--line); }
.article-hero h1 { max-width: 800px; }
.article-hero p { max-width: 760px; color: var(--muted); font-size: 1.05rem; margin: 20px 0 0; }
.article-layout { display: grid; grid-template-columns: minmax(0, 1fr) 300px; gap: 46px; align-items: start; }
.article-body { padding: 70px 0 82px; }
.article-body h2 { font-size: 1.75rem; margin: 40px 0 14px; }
.article-body h2:first-child { margin-top: 0; }
.article-body h3 { margin: 28px 0 8px; }
.article-body p { margin: 0 0 18px; color: #49443f; }
.article-body ul { margin: 8px 0 22px; padding-left: 22px; color: #49443f; }
.article-body li { margin: 7px 0; }
.article-aside { position: sticky; top: 98px; margin-top: 70px; }
.aside-box { background: var(--card); border: 1px solid var(--line); padding: 22px; }
.aside-box + .aside-box { margin-top: 14px; }
.aside-box h3 { font-size: 1rem; margin-bottom: 12px; }
.aside-box a { display: block; padding: 8px 0; color: var(--vermilion); border-bottom: 1px dashed var(--line); font-size: .93rem; }
.aside-box a:last-child { border-bottom: 0; }
.notice { border-left: 3px solid var(--vermilion); background: var(--soft-red); padding: 16px 18px; color: #5b4943; margin: 24px 0; }
.site-footer { background: #1f2e3a; color: #dce4e8; padding: 42px 0 24px; }
.footer-grid { display: grid; grid-template-columns: 1.2fr .8fr .9fr; gap: 30px; padding-bottom: 30px; border-bottom: 1px solid rgba(255,255,255,.17); }
.footer-brand { color: #fff; }
.footer-grid h3 { color: #fff; font-size: 1rem; margin-bottom: 12px; }
.footer-grid p, .footer-grid a { color: #bfcbd1; font-size: .9rem; }
.footer-grid a { display: block; margin: 6px 0; }
.disclaimer { margin: 24px 0 0; color: #aebbc2; font-size: .82rem; }
.copyright { padding-top: 18px; color: #93a2aa; font-size: .8rem; }

@media (max-width: 860px) {
    .container { width: min(100% - 28px, 720px); }
    .nav-wrap { min-height: 66px; }
    .menu-toggle { display: inline-grid; place-items: center; margin-left: auto; }
    .site-nav { display: none; position: absolute; left: 14px; right: 14px; top: 74px; background: var(--card); border: 1px solid var(--line); padding: 14px 18px; flex-direction: column; align-items: stretch; gap: 3px; box-shadow: var(--shadow); }
    .site-nav.is-open { display: flex; }
    .site-nav a { padding: 10px 0; }
    .nav-cta { text-align: center; }
    .hero { padding: 60px 0 54px; }
    .hero-grid, .offline-grid { grid-template-columns: 1fr; gap: 36px; }
    .hero-art { min-height: 320px; }
    .category-grid { grid-template-columns: repeat(2, 1fr); }
    .stats-grid { grid-template-columns: repeat(2, 1fr); }
    .showcase-grid, .quote-grid { grid-template-columns: 1fr; }
    .showcase-card img { max-width: 320px; }
    .cta-wrap { flex-direction: column; align-items: flex-start; }
    .article-layout { grid-template-columns: 1fr; }
    .article-aside { position: static; margin: 0 0 48px; }
    .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 520px) {
    h1 { font-size: 2.35rem; }
    .section { padding: 62px 0; }
    .category-grid, .feature-list, .stats-grid, .deep-grid, .footer-grid { grid-template-columns: 1fr; }
    .section-head { display: block; }
    .section-head p { margin-top: 12px; }
    .phone { width: 206px; }
    .hero-art::before { width: 260px; height: 260px; }
    .article-hero { padding: 56px 0 36px; }
}