:root {
  --blue: #1677e8;
  --blue-dark: #105cba;
  --blue-light: #eaf4ff;
  --ink: #13233a;
  --muted: #5f7187;
  --line: #d9e5f3;
  --surface: #f6faff;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--ink); background: #fff; font-family: "Microsoft YaHei", "PingFang SC", system-ui, sans-serif; line-height: 1.65; }
a { color: inherit; text-decoration: none; }
.site-header { width: min(1180px, calc(100% - 40px)); min-height: 88px; margin: 0 auto; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand { display: inline-flex; align-items: center; gap: 12px; color: #31445d; font-weight: 700; }
.brand img { display: block; width: 156px; max-height: 56px; object-fit: contain; object-position: left center; }
.brand span { border-left: 1px solid var(--line); padding-left: 16px; white-space: nowrap; font-size: 16px; }
nav { display: flex; align-items: center; gap: 20px; color: #41617f; font-size: 14px; }
nav a:first-child:hover, .footer-links a:hover { color: var(--blue); }
.nav-button { border: 1px solid #b8cde4; border-radius: 7px; padding: 6px 13px; color: var(--blue); font-weight: 600; }
main { overflow: hidden; }
.hero { min-height: 520px; background: linear-gradient(180deg, #f4f9ff, #ffffff); border-top: 1px solid #e9f1fa; display: grid; grid-template-columns: minmax(0, 1fr) 454px; align-items: center; gap: 54px; padding: 66px max(20px, calc((100% - 1080px) / 2)); }
.hero-copy { max-width: 660px; }
.eyebrow { margin: 0 0 8px; color: var(--blue); font-size: 12px; letter-spacing: .16em; font-weight: 800; }
h1, h2, h3 { margin: 0; line-height: 1.25; }
h1 { font-size: clamp(34px, 5vw, 54px); letter-spacing: -.04em; }
.hero-text { margin: 20px 0; max-width: 640px; color: var(--muted); font-size: 17px; }
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 28px; }
.button { display: inline-flex; min-height: 44px; align-items: center; justify-content: center; padding: 0 20px; border-radius: 8px; font-size: 15px; font-weight: 700; transition: transform .18s ease, box-shadow .18s ease, background .18s ease; }
.button:hover { transform: translateY(-1px); }
.button-primary { color: #fff; background: var(--blue); box-shadow: 0 8px 18px rgba(22,119,232,.2); }
.button-primary:hover { background: var(--blue-dark); }
.button-secondary { color: var(--blue); border: 1px solid #b8cde4; background: #fff; }
.notice { margin: 18px 0 0; color: #7890a8; font-size: 13px; }
.hero-product-preview { position: relative; width: 454px; height: 340px; margin: 0 auto; }
.desktop-cover { position: absolute; top: 24px; left: 0; width: 348px; min-height: 242px; overflow: hidden; border: 1px solid #cbdced; border-radius: 13px; background: #f3f8ff; box-shadow: 0 18px 38px rgba(34,77,130,.16); }
.desktop-titlebar { display: flex; align-items: center; justify-content: flex-end; gap: 4px; height: 22px; padding: 0 9px; background: #fff; border-bottom: 1px solid #e5eef8; }
.desktop-titlebar span { width: 5px; height: 5px; border-radius: 50%; background: #a6b8ce; }
.desktop-cover-body { display: grid; grid-template-columns: 83px 1fr; min-height: 220px; }
.desktop-cover aside { display: flex; flex-direction: column; gap: 10px; padding: 12px 9px; border-right: 1px solid #dce9f6; background: #fff; color: #64809e; font-size: 8px; }
.desktop-cover aside img { width: 47px; height: 27px; object-fit: contain; object-position: center; }
.desktop-cover aside b { padding: 5px 6px; border-radius: 4px; color: var(--blue); background: #e8f2ff; font-size: 9px; }
.desktop-main { padding: 19px 16px; color: #1d324e; }
.desktop-main > p { margin: 0 0 13px; font-size: 20px; font-weight: 800; letter-spacing: -.06em; }
.desktop-route, .desktop-status { border: 1px solid #e1ebf6; border-radius: 8px; background: #fff; }
.desktop-route { display: grid; gap: 8px; padding: 11px; font-size: 10px; }
.desktop-route strong { font-size: 12px; }.desktop-route span { color: var(--blue); }
.desktop-status { position: relative; display: grid; gap: 4px; min-height: 74px; margin-top: 10px; padding: 10px; }.desktop-status small { color: #7a91a9; font-size: 9px; }.desktop-status b { color: #718aa6; font-size: 11px; }.desktop-status button, .phone-status button { border: 0; color: #fff; background: #2e5e99; font: inherit; font-weight: 700; pointer-events: none; }.desktop-status button { position: absolute; right: 10px; bottom: 10px; padding: 7px 10px; border-radius: 5px; font-size: 10px; }
.desktop-cover em, .phone-cover em { position: absolute; z-index: 2; right: 12px; bottom: 9px; color: #4d6b8c; font-style: normal; font-size: 10px; font-weight: 800; letter-spacing: .04em; }
.phone-cover { position: absolute; z-index: 2; right: 0; bottom: 0; width: 154px; height: 302px; overflow: hidden; border: 6px solid #15304f; border-radius: 24px; background: #f2f7ff; box-shadow: 0 20px 35px rgba(18,51,96,.24); }
.phone-speaker { position: absolute; z-index: 3; top: 7px; left: 50%; width: 36px; height: 4px; border-radius: 99px; background: #3f5876; transform: translateX(-50%); }.phone-cover-body { padding: 26px 10px 12px; }.phone-top { display: flex; align-items: center; gap: 5px; color: #182f4c; font-size: 10px; font-weight: 800; }.phone-top img { width: 20px; height: 20px; border-radius: 6px; }.phone-status { display: grid; gap: 5px; margin-top: 14px; padding: 13px 10px; border-radius: 12px; color: #fff; background: var(--blue); }.phone-status b { font-size: 14px; }.phone-status small { font-size: 8px; line-height: 1.35; }.phone-status button { justify-self: end; padding: 5px 8px; border-radius: 6px; font-size: 9px; }.phone-route { display: grid; gap: 7px; margin-top: 12px; padding: 11px 9px; border-radius: 11px; background: #fff; color: #6080a0; font-size: 8px; }.phone-route strong { color: #1f3552; font-size: 11px; }.phone-cover em { right: 9px; bottom: 6px; color: #7890aa; font-size: 8px; }
.section { width: min(1010px, calc(100% - 40px)); margin: 0 auto; padding: 80px 0; }
.section-heading { display: flex; justify-content: space-between; align-items: flex-end; gap: 28px; margin-bottom: 30px; }
.section-heading h2 { font-size: 30px; letter-spacing: -.03em; }
.section-heading > p { max-width: 360px; margin: 0; color: var(--muted); font-size: 14px; }
.download-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 20px; }
.software-card { position: relative; display: flex; min-height: 408px; flex-direction: column; align-items: flex-start; padding: 28px; border: 1px solid var(--line); border-radius: 15px; background: #fff; box-shadow: 0 10px 24px rgba(42,83,126,.055); }
.software-card.featured { border-color: #a8cff6; box-shadow: 0 14px 32px rgba(22,119,232,.105); }
.platform-logo-wrap { display: grid; place-items: center; width: 92px; height: 68px; margin-bottom: 17px; border-radius: 12px; background: #f5f9ff; }
.platform-logo { display: block; object-fit: contain; }.windows-logo-wrap { width: 126px; background: #fff; }.windows-logo { width: 116px; height: 64px; }.android-logo-wrap { width: 68px; height: 68px; }.android-logo { width: 54px; height: 54px; border-radius: 14px; }
.card-topline { width: 100%; display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.pill { color: var(--blue); font-size: 13px; font-weight: 700; }
.version { color: #6e839a; font-size: 13px; }
.software-card h3 { margin: 9px 0 12px; font-size: 23px; }
.software-card > p { margin: 0; color: var(--muted); font-size: 14px; }
.software-card ul { width: 100%; min-height: 94px; margin: 22px 0 24px; padding: 0; list-style: none; color: #4f657c; font-size: 14px; }
.software-card li { position: relative; padding: 3px 0 3px 19px; }
.software-card li::before { content: ""; position: absolute; top: .78em; left: 1px; width: 7px; height: 7px; border: 2px solid var(--blue); border-radius: 50%; }
.button-wide { width: 100%; margin-top: auto; }
.file-note { width: 100%; margin-top: 10px !important; color: #8295aa !important; text-align: center; font-size: 12px !important; }
.steps-section { padding-top: 20px; }
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin: 0; padding: 0; list-style: none; }
.steps li { display: flex; gap: 16px; padding: 24px 20px; border-radius: 12px; background: var(--surface); }
.steps li > span { flex: 0 0 auto; width: 31px; height: 31px; border-radius: 50%; color: #fff; background: var(--blue); text-align: center; line-height: 31px; font-size: 14px; font-weight: 800; }
.steps h3 { font-size: 16px; }
.steps p { margin: 7px 0 0; color: var(--muted); font-size: 13px; }
.safety { display: grid; grid-template-columns: 240px minmax(0, 1fr); gap: 52px; margin-bottom: 80px; padding: 36px; border: 1px solid #cfe3f6; border-radius: 14px; background: #f7fbff; }
.safety h2 { font-size: 25px; }
.safety-copy p { margin: 0 0 12px; color: #4c647d; font-size: 14px; }
.safety-copy p:last-child { margin-bottom: 0; }
footer { display: grid; grid-template-columns: 1fr auto; gap: 15px 35px; padding: 31px max(20px, calc((100% - 1010px) / 2)); color: #708398; border-top: 1px solid #e6eef7; font-size: 13px; }
footer strong { color: #37516f; } .footer-links { display: flex; gap: 18px; } footer p { grid-column: 1 / -1; margin: 0; }
@media (max-width: 780px) { .site-header { min-height: 72px; } .brand img { width: 125px; max-height: 46px; } .brand span { font-size: 13px; } nav a:first-child { display: none; } .hero { grid-template-columns: 1fr; gap: 30px; padding-top: 54px; padding-bottom: 50px; } .hero-product-preview { width: min(454px, 100%); } .section { padding: 56px 0; } .section-heading { align-items: flex-start; flex-direction: column; gap: 10px; } .download-grid, .steps { grid-template-columns: 1fr; } .software-card { min-height: 0; } .software-card ul { min-height: 0; } .safety { grid-template-columns: 1fr; gap: 16px; margin-bottom: 56px; padding: 27px 22px; } footer { grid-template-columns: 1fr; } .footer-links { grid-row: 2; flex-wrap: wrap; } footer p { grid-column: auto; grid-row: 3; } }
@media (max-width: 510px) { .hero-product-preview { height: 280px; transform: scale(.88); transform-origin: top left; width: 114%; margin-bottom: -35px; } }
@media (max-width: 410px) { .site-header { width: min(100% - 28px, 1180px); } .brand span { display: none; } .hero, .section { width: min(100% - 28px, 1010px); padding-left: 0; padding-right: 0; } .hero { width: 100%; padding-left: 14px; padding-right: 14px; } h1 { font-size: 37px; } .section-heading h2 { font-size: 27px; } .hero-product-preview { transform: scale(.75); width: 133%; height: 245px; margin-bottom: -60px; } }