:root {
  --blue: #0078d7;
  --blue-dark: #005a9e;
  --ink: #202124;
  --muted: #60666d;
  --page: #f4f5f6;
  --panel: #ffffff;
  --line: #cbd0d5;
  --field: #f1f3f4;
  --max: 1180px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--ink); background: var(--page); font-family: "Segoe UI", "Microsoft YaHei", Arial, sans-serif; }
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
h1, h2, h3, p, dl, dd { margin: 0; }
.site-header { position: sticky; top: 0; z-index: 20; display: flex; align-items: center; justify-content: space-between; gap: 20px; min-height: 62px; padding: 12px max(20px, calc((100% - var(--max)) / 2)); border-bottom: 1px solid var(--line); background: rgba(255, 255, 255, .96); }
.brand { display: inline-flex; align-items: center; gap: 10px; font-size: 19px; font-weight: 800; }
.brand img, .soft-title img { width: 28px; height: 28px; }
nav { display: flex; flex-wrap: wrap; gap: 22px; font-size: 14px; color: #40454b; }
nav a:hover, footer a:hover { color: var(--blue); }
.shell { width: min(var(--max), calc(100% - 40px)); margin-inline: auto; }
.hero { display: grid; grid-template-columns: minmax(0, 1fr) 390px; gap: clamp(30px, 6vw, 80px); align-items: center; padding: 66px 0 60px; }
.hero-copy { display: grid; gap: 19px; max-width: 700px; }
.eyebrow { color: var(--blue); font-size: 12px; font-weight: 800; letter-spacing: .08em; text-transform: uppercase; }
h1 { font-size: clamp(38px, 5vw, 64px); line-height: 1.12; letter-spacing: 0; }
h2 { font-size: clamp(26px, 3vw, 38px); line-height: 1.22; letter-spacing: 0; }
h3 { font-size: 18px; line-height: 1.4; }
.lead, .section-heading p:not(.eyebrow), .download-card p, .trust p, .faq p { color: var(--muted); font-size: 16px; line-height: 1.8; }
.hero-actions, .article-actions { display: flex; flex-wrap: wrap; gap: 12px; }
.button { display: inline-flex; align-items: center; justify-content: center; min-height: 42px; padding: 0 20px; border: 1px solid var(--blue); background: #fff; color: var(--blue); font-weight: 800; }
.button.primary { background: var(--blue); color: #fff; }
.button:hover { background: #eaf4ff; }
.button.primary:hover { background: var(--blue-dark); }
.wide { width: 100%; }
.download-card { display: grid; gap: 17px; padding: 22px; border: 1px solid var(--line); background: var(--panel); box-shadow: 0 10px 26px rgba(0,0,0,.08); }
.soft-title { display: flex; align-items: center; gap: 13px; }
.soft-title h2 { font-size: 28px; }
.download-card dl { border: 1px solid var(--line); }
.download-card dl div { display: grid; grid-template-columns: 90px 1fr; border-bottom: 1px solid var(--line); }
.download-card dl div:last-child { border-bottom: 0; }
dt, dd { padding: 8px 10px; font-size: 14px; }
dt { background: #f5f5f5; color: #555; border-right: 1px solid var(--line); }
.note { font-size: 13px !important; }
.section { padding: 64px 0; }
.section-heading { display: grid; gap: 11px; max-width: 820px; margin-bottom: 28px; }
.intro, .faq { background: #fff; border-block: 1px solid var(--line); }
.showcase { display: grid; grid-template-columns: .82fr 1fr; gap: 18px; align-items: center; }
.showcase > img { border: 1px solid var(--line); background: #fff; }
.window-panel { overflow: hidden; border: 1px solid #bfc4c8; background: #eee; box-shadow: 0 14px 28px rgba(0,0,0,.1); }
.titlebar { display: flex; align-items: center; justify-content: space-between; min-height: 38px; padding: 0 10px; background: #fff; font-weight: 700; }
.tabs { display: flex; overflow-x: auto; padding: 8px 8px 0; border-bottom: 1px solid var(--line); }
.tabs span, .tabs b { flex: 0 0 auto; padding: 8px 10px; border: 1px solid var(--line); border-bottom: 0; background: #f9f9f9; font-size: 14px; }
.tabs b { position: relative; top: 1px; background: #fff; }
.specs { display: grid; grid-template-columns: 96px 1fr; gap: 8px; padding: 14px; }
.specs label { padding-top: 6px; text-align: right; }
.specs strong { min-height: 30px; padding: 6px 8px; border: 1px solid #bcbcbc; background: var(--field); font-weight: 400; }
.feature-grid, .article-grid, .trust-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 14px; }
.trust-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.feature-grid article, .article-grid a, .trust-grid article { padding: 20px; border: 1px solid var(--line); background: #fff; }
.feature-grid h3, .article-grid b, .trust-grid h3 { display: block; margin-bottom: 10px; }
.feature-grid p, .article-grid p { color: var(--muted); line-height: 1.68; }
.workflow { background: #eceff1; }
.workflow ol { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 14px; padding: 0; margin: 0; list-style: none; }
.workflow li { padding: 20px; border: 1px solid var(--line); background: #fff; }
.workflow b { display: block; margin-bottom: 8px; color: var(--blue); }
.workflow span { color: var(--muted); line-height: 1.65; }
.article-grid a:hover { border-color: var(--blue); box-shadow: 0 8px 20px rgba(0, 90, 158, .12); }
.article-grid span { display: inline-flex; margin-bottom: 10px; padding: 5px 8px; color: #fff; background: var(--blue); font-size: 12px; font-weight: 800; }
.faq details { padding: 16px 0; border-bottom: 1px solid var(--line); }
.faq summary { cursor: pointer; font-weight: 800; }
.faq summary + p { margin-top: 10px; }
.download { display: flex; justify-content: space-between; align-items: center; gap: 28px; margin: 0 auto 54px; padding: 30px; border: 1px solid var(--line); background: #fff; }
footer { display: flex; flex-wrap: wrap; gap: 12px; padding: 22px max(20px, calc((100% - var(--max)) / 2)); border-top: 1px solid var(--line); color: #666; background: #eee; }

/* Article reading layout */
.article-wrap { padding: 34px 0 64px; }
.breadcrumbs { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 26px; color: #6b7075; font-size: 14px; }
.breadcrumbs a { color: var(--blue); }
.article-layout { display: grid; grid-template-columns: minmax(0, 760px) 270px; justify-content: space-between; gap: 36px; align-items: start; }
.article-paper { padding: clamp(24px, 4vw, 48px); border: 1px solid var(--line); background: #fff; }
.article-meta { display: flex; flex-wrap: wrap; gap: 12px; margin: 14px 0 28px; color: #777; font-size: 14px; }
.article-body { color: #373b40; font-size: 16px; line-height: 1.95; }
.article-body > p { margin: 0 0 20px; }
.article-body h2 { margin: 42px 0 15px; padding-bottom: 12px; border-bottom: 1px solid #d9dde0; font-size: 25px; }
.article-body h3 { margin: 24px 0 10px; font-size: 18px; }
.article-body ul, .article-body ol { padding-left: 22px; margin: 0 0 22px; }
.article-body li + li { margin-top: 8px; }
.article-tip { margin: 26px 0; padding: 16px 18px; border-left: 4px solid var(--blue); background: #eef7ff; color: #3f4e5a; }
.article-actions { margin-top: 34px; padding-top: 24px; border-top: 1px solid #dde1e4; }
.article-aside { position: sticky; top: 84px; display: grid; gap: 14px; }
.aside-box { padding: 18px; border: 1px solid var(--line); background: #fff; }
.aside-box h2 { margin-bottom: 12px; font-size: 18px; }
.aside-box ul { display: grid; gap: 9px; padding: 0; margin: 0; list-style: none; font-size: 14px; line-height: 1.5; }
.aside-box a { color: #4d565f; }
.aside-box a:hover { color: var(--blue); }
.aside-download { display: grid; gap: 12px; }
.aside-download p { color: var(--muted); font-size: 13px; line-height: 1.65; }
@media (max-width: 980px) { .hero, .showcase, .feature-grid, .article-grid, .trust-grid, .workflow ol, .article-layout { grid-template-columns: 1fr; } .article-aside { position: static; grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (max-width: 720px) { .site-header { align-items: flex-start; flex-direction: column; } .shell { width: min(100% - 28px, var(--max)); } .hero { padding: 40px 0; } .download { align-items: flex-start; flex-direction: column; } .download-card dl div, .specs { grid-template-columns: 1fr; } .specs label { text-align: left; } .article-wrap { padding-top: 24px; } .article-paper { padding: 22px 18px; } .article-body { font-size: 16px; line-height: 1.85; } .article-body h2 { margin-top: 32px; font-size: 23px; } .article-aside { grid-template-columns: 1fr; } }