:root {
  --navy: #152038;
  --blue: #315fe9;
  --blue-dark: #2348b9;
  --muted: #68728a;
  --line: #dde3ee;
  --soft: #f3f6fb;
  --paper: #ffffff;
  font-family: Inter, "Microsoft YaHei", "PingFang SC", system-ui, sans-serif;
  color: var(--navy);
  background: var(--paper);
  scroll-behavior: smooth;
}

* { box-sizing: border-box; }
body { margin: 0; min-width: 320px; background: #fff; }
a { color: inherit; text-decoration: none; }
button { font: inherit; }

.site-header, footer {
  width: min(1180px, calc(100% - 48px));
  margin: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.site-header { height: 78px; border-bottom: 1px solid #edf0f5; }
.brand { display: flex; align-items: center; gap: 11px; font-size: 15px; font-weight: 800; }
.brand-icon { display: grid; place-items: center; width: 34px; height: 34px; border-radius: 10px; color: white; background: var(--blue); }
.brand-icon svg { width: 21px; fill: none; stroke: currentColor; stroke-width: 2.2; stroke-linecap: round; stroke-linejoin: round; }
.brand-icon.small { width: 30px; height: 30px; }
.header-link { color: var(--muted); font-size: 14px; font-weight: 700; }
.header-link:hover { color: var(--blue); }

main { overflow: hidden; }
.hero {
  width: min(1180px, calc(100% - 48px));
  min-height: 610px;
  margin: auto;
  display: grid;
  grid-template-columns: .92fr 1.08fr;
  gap: 76px;
  align-items: center;
  position: relative;
}
.hero::after { content: ""; position: absolute; z-index: -1; width: 620px; height: 620px; right: -230px; top: -90px; border-radius: 50%; background: radial-gradient(circle, #e8edff 0, rgba(239,243,255,.25) 60%, transparent 70%); }
.version-pill { display: inline-flex; align-items: center; gap: 9px; padding: 7px 11px; border: 1px solid #dce4ff; border-radius: 999px; color: var(--blue); background: #f5f7ff; font-size: 11px; font-weight: 800; letter-spacing: .06em; }
.version-pill span { width: 7px; height: 7px; border-radius: 50%; background: #20ad78; box-shadow: 0 0 0 4px rgba(32,173,120,.12); }
.hero h1 { margin: 24px 0 18px; font-size: clamp(46px, 5.5vw, 76px); line-height: 1.04; letter-spacing: -.065em; }
.hero h1 em { color: var(--blue); font-style: normal; }
.hero-lead { max-width: 540px; margin: 0; color: var(--muted); font-size: 17px; line-height: 1.8; }
.hero-actions { display: flex; align-items: center; gap: 14px; margin-top: 32px; }
.primary-action, .secondary-action { display: inline-flex; justify-content: center; align-items: center; height: 52px; padding: 0 22px; border-radius: 12px; font-size: 14px; font-weight: 800; transition: .18s ease; }
.primary-action { gap: 9px; color: white; background: var(--blue); box-shadow: 0 12px 26px rgba(49,95,233,.25); }
.primary-action svg { width: 20px; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
.primary-action:hover { transform: translateY(-2px); background: var(--blue-dark); }
.secondary-action { border: 1px solid var(--line); background: white; }
.secondary-action:hover { border-color: #b8c4de; background: var(--soft); }
.file-note { margin: 14px 0 0; color: #9299aa; font-size: 11px; }

.product-preview { transform: rotate(1.2deg); border: 1px solid #dce2ef; border-radius: 20px; overflow: hidden; background: white; box-shadow: 0 32px 80px rgba(31,45,77,.16); }
.preview-top { display: flex; align-items: center; gap: 11px; padding: 16px 18px; border-bottom: 1px solid #e7eaf1; }
.preview-logo { display: grid; place-items: center; width: 34px; height: 34px; border-radius: 10px; color: white; background: var(--blue); font-size: 20px; }
.preview-top div { display: grid; gap: 2px; }
.preview-top strong { font-size: 12px; }
.preview-top small { color: #9299aa; font-size: 7px; letter-spacing: .15em; }
.status-dot { width: 8px; height: 8px; margin-left: auto; border-radius: 50%; background: #1bad77; }
.preview-body { padding: 20px; background: #f6f8fc; }
.preview-body > label { color: #788198; font-size: 9px; font-weight: 800; }
.fake-input { display: flex; align-items: center; height: 43px; margin-top: 7px; padding-left: 13px; border: 1px solid #dfe4ee; border-radius: 10px; background: white; font-size: 12px; }
.fake-input span { color: #8a93a6; font-size: 17px; }
.fake-input i { display: grid; place-items: center; align-self: stretch; margin-left: auto; padding: 0 16px; border-radius: 9px; color: white; background: var(--blue); font-style: normal; font-weight: 800; }
.preview-summary { display: flex; justify-content: space-between; align-items: center; margin: 22px 1px 9px; }
.preview-summary strong { font-size: 12px; }
.preview-summary span { color: #768097; font-size: 9px; }
.file-row { display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 11px; padding: 11px 12px; border-bottom: 1px solid #edf0f5; background: white; }
.file-row:first-of-type { border-radius: 10px 10px 0 0; }
.file-row b { display: grid; place-items: center; width: 16px; height: 16px; border-radius: 4px; color: white; background: var(--blue); font-size: 9px; }
.file-row div { min-width: 0; display: grid; gap: 3px; }
.file-row strong, .file-row small { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.file-row strong { font-size: 10px; }
.file-row small, .file-row > span { color: #8b94a7; font-size: 8px; }
.file-row.faded { opacity: .65; }
.preview-download { display: flex; justify-content: space-between; align-items: center; margin-top: 14px; padding: 13px; border-radius: 10px; background: #e9eef9; }
.preview-download div { display: grid; gap: 3px; }
.preview-download strong { font-size: 9px; }
.preview-download small { color: #7d879b; font-size: 8px; }
.preview-download button { height: 32px; padding: 0 12px; border: 0; border-radius: 8px; color: white; background: var(--blue); font-size: 9px; font-weight: 800; }

.features { display: grid; grid-template-columns: repeat(3, 1fr); width: min(1180px, calc(100% - 48px)); margin: 15px auto 110px; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.features article { padding: 34px 32px; border-right: 1px solid var(--line); }
.features article:first-child { padding-left: 0; }
.features article:last-child { border: 0; }
.features span { color: var(--blue); font-size: 10px; font-weight: 900; letter-spacing: .12em; }
.features h2 { margin: 12px 0 8px; font-size: 17px; }
.features p { margin: 0; color: var(--muted); font-size: 13px; line-height: 1.75; }

.install-section { padding: 100px 24px 110px; background: var(--soft); }
.section-heading { width: min(850px, 100%); margin: auto; text-align: center; }
.section-heading > p, .usage-section > div:first-child p { margin: 0 0 12px; color: var(--blue); font-size: 11px; font-weight: 900; letter-spacing: .16em; }
.section-heading h2, .usage-section h2 { margin: 0; font-size: clamp(30px, 4vw, 46px); letter-spacing: -.04em; }
.section-heading > span { display: block; margin-top: 16px; color: var(--muted); font-size: 14px; line-height: 1.7; }
.steps { width: min(940px, 100%); margin: 60px auto 0; padding: 0; list-style: none; counter-reset: steps; }
.steps li { display: grid; grid-template-columns: 48px minmax(0,1fr) 250px; gap: 22px; align-items: center; min-height: 160px; padding: 27px 0; border-bottom: 1px solid var(--line); }
.steps li:last-child { border-bottom: 0; }
.step-number { display: grid; place-items: center; align-self: start; width: 38px; height: 38px; border-radius: 50%; color: var(--blue); background: #e3e9ff; font-size: 12px; font-weight: 900; }
.steps h3 { margin: 0 0 10px; font-size: 18px; }
.steps p { margin: 0; color: var(--muted); font-size: 13px; line-height: 1.75; }
code { padding: 2px 6px; border: 1px solid #d8deea; border-radius: 5px; color: #33405a; background: #fff; font-family: "Cascadia Code", Consolas, monospace; font-size: .9em; }
.steps div > code { display: inline-block; margin-top: 12px; padding: 8px 12px; }
.step-visual { min-height: 86px; border: 1px solid #dce2ed; border-radius: 14px; background: white; box-shadow: 0 8px 24px rgba(35,48,76,.06); }
.zip-visual { display: flex; align-items: center; justify-content: center; gap: 18px; }
.zip-visual span { display: grid; place-items: center; width: 50px; height: 58px; border: 2px solid var(--blue); border-radius: 6px; color: var(--blue); font-size: 11px; font-weight: 900; }
.zip-visual .folder-shape { width: 72px; height: 48px; border: 0; border-radius: 5px; color: #5d6780; background: #dfe5f0; }
.zip-visual i { color: #9099ac; font-style: normal; }
.browser-visual { padding: 12px; }
.browser-dots { padding-bottom: 9px; border-bottom: 1px solid #edf0f4; color: #c1c7d2; font-size: 8px; letter-spacing: 3px; }
.browser-visual strong { display: block; margin-top: 13px; padding: 8px; border-radius: 6px; color: #657088; background: #f3f5f8; font-family: Consolas, monospace; font-size: 9px; }
.toggle-visual { display: flex; align-items: center; justify-content: center; gap: 20px; color: #525e76; font-size: 11px; font-weight: 800; }
.toggle-visual i { width: 44px; height: 24px; padding: 3px; border-radius: 20px; background: var(--blue); }
.toggle-visual b { display: block; width: 18px; height: 18px; margin-left: auto; border-radius: 50%; background: white; }
.load-visual, .done-visual { display: flex; align-items: center; justify-content: center; }
.load-visual span { padding: 10px 12px; border: 1px solid #cfd6e4; border-radius: 7px; color: #4c5870; background: #f8f9fb; font-size: 9px; font-weight: 800; }
.done-visual { gap: 10px; color: #167e5b; font-size: 11px; }
.done-visual span { display: grid; place-items: center; width: 28px; height: 28px; border-radius: 50%; color: white; background: #1da873; }

.usage-section { width: min(1080px, calc(100% - 48px)); margin: auto; padding: 110px 0; }
.usage-section > div:first-child { text-align: center; }
.usage-flow { display: grid; grid-template-columns: 1fr auto 1fr auto 1fr; gap: 20px; align-items: center; margin-top: 50px; }
.usage-flow article { display: grid; place-items: center; min-height: 160px; padding: 26px; border: 1px solid var(--line); border-radius: 16px; text-align: center; }
.usage-flow article span { display: grid; place-items: center; width: 34px; height: 34px; margin-bottom: 14px; border-radius: 10px; color: white; background: var(--blue); font-size: 12px; font-weight: 900; }
.usage-flow article strong { font-size: 15px; }
.usage-flow article small { margin-top: 7px; color: var(--muted); font-size: 11px; }
.usage-flow > i { color: #a4adbe; font-style: normal; }

.notice { display: flex; gap: 20px; width: min(940px, calc(100% - 48px)); margin: 0 auto 110px; padding: 24px; border: 1px solid #dfe5f1; border-radius: 16px; background: #f8faff; }
.notice-icon { flex: 0 0 auto; display: grid; place-items: center; width: 32px; height: 32px; border-radius: 50%; color: var(--blue); background: #e2e9ff; font-family: Georgia, serif; font-weight: 800; }
.notice h2 { margin: 1px 0 7px; font-size: 15px; }
.notice p { margin: 0; color: var(--muted); font-size: 12px; line-height: 1.8; }

footer { min-height: 100px; border-top: 1px solid var(--line); }
footer p { color: #8b94a7; font-size: 11px; }

@media (max-width: 880px) {
  .hero { grid-template-columns: 1fr; gap: 50px; padding: 80px 0; }
  .product-preview { width: min(620px, 100%); margin: auto; }
  .features { grid-template-columns: 1fr; }
  .features article, .features article:first-child { padding: 28px 0; border-right: 0; border-bottom: 1px solid var(--line); }
  .steps li { grid-template-columns: 48px 1fr; }
  .step-visual { display: none; }
}

@media (max-width: 640px) {
  .site-header, footer, .hero, .features, .usage-section, .notice { width: calc(100% - 30px); }
  .site-header { height: 66px; }
  .header-link { display: none; }
  .hero { padding: 60px 0; }
  .hero h1 { font-size: 45px; }
  .hero-actions { align-items: stretch; flex-direction: column; }
  .product-preview { transform: none; }
  .features { margin-bottom: 70px; }
  .install-section { padding: 72px 15px; }
  .steps { margin-top: 42px; }
  .steps li { grid-template-columns: 38px 1fr; gap: 14px; }
  .step-number { width: 32px; height: 32px; }
  .usage-section { padding: 75px 0; }
  .usage-flow { grid-template-columns: 1fr; }
  .usage-flow > i { transform: rotate(90deg); text-align: center; }
  footer { align-items: flex-start; flex-direction: column; justify-content: center; gap: 8px; padding: 24px 0; }
  footer p { margin: 0; }
}