:root {
  color-scheme: light;
  --page: #f6f8fb;
  --surface: #ffffff;
  --surface-soft: #eef4ff;
  --surface-blue: #e7efff;
  --ink: #0b1f3a;
  --ink-soft: #42546b;
  --muted: #6a7a8e;
  --line: #dce4ee;
  --line-strong: #c6d3e2;
  --blue: #2563eb;
  --blue-hover: #1d4ed8;
  --blue-soft: #dbe8ff;
  --blue-deep: #10306d;
  --focus: rgba(37, 99, 235, .34);
  --shadow: 0 24px 70px rgba(26, 61, 108, .13);
  --shadow-soft: 0 12px 36px rgba(26, 61, 108, .08);
  --radius: 20px;
  --radius-control: 12px;
  --container: 1200px;
  --header-height: 72px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: calc(var(--header-height) + 20px); }

body {
  margin: 0;
  background: var(--page);
  color: var(--ink);
  font-family: "Segoe UI Variable Text", "Microsoft YaHei UI", "PingFang SC", system-ui, sans-serif;
  font-size: 16px;
  line-height: 1.65;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button, a { touch-action: manipulation; }
button, input, select, textarea { font: inherit; }

.container { width: min(calc(100% - 48px), var(--container)); margin-inline: auto; }
.skip-link { position: fixed; left: 16px; top: -60px; z-index: 1000; padding: 10px 14px; border-radius: 10px; background: var(--ink); color: #fff; font-weight: 700; }
.skip-link:focus { top: 12px; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 1px solid rgba(198, 211, 226, .78);
  background: rgba(246, 248, 251, .9);
  backdrop-filter: blur(18px) saturate(140%);
}

.nav-wrap { min-height: var(--header-height); display: flex; align-items: center; gap: 28px; }
.brand { display: inline-flex; align-items: center; gap: 11px; flex: 0 0 auto; }
.brand img { width: 40px; height: 40px; filter: drop-shadow(0 7px 14px rgba(37, 99, 235, .18)); }
.brand-copy { display: flex; flex-direction: column; align-items: flex-start; gap: 2px; line-height: 1; }
.brand-cn { color: var(--ink); font-size: 18px; font-weight: 800; letter-spacing: .08em; }
.brand-name { color: var(--ink-soft); font-size: 13px; font-weight: 700; letter-spacing: -.01em; }

#site-nav { display: flex; align-items: center; gap: 24px; margin-left: auto; white-space: nowrap; }
#site-nav a { position: relative; color: var(--ink-soft); font-size: 14px; font-weight: 650; transition: color .2s ease; }
#site-nav a::after { content: ""; position: absolute; left: 0; right: 100%; bottom: -8px; height: 2px; background: var(--blue); transition: right .2s ease; }
#site-nav a:hover { color: var(--ink); }
#site-nav a:hover::after { right: 0; }

.nav-actions { display: flex; align-items: center; gap: 14px; }
.nav-download { color: var(--blue); font-size: 14px; font-weight: 750; white-space: nowrap; }
.nav-download:hover { color: var(--blue-hover); }
.menu-button { display: none; width: 44px; height: 44px; margin-left: auto; padding: 10px; border: 0; border-radius: var(--radius-control); background: transparent; cursor: pointer; }
.menu-button span { display: block; width: 22px; height: 2px; margin: 5px auto; border-radius: 2px; background: var(--ink); transition: transform .2s ease, opacity .2s ease; }
.menu-button[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.menu-button[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.menu-button[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.button {
  min-height: 48px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 22px;
  border: 1px solid transparent;
  border-radius: var(--radius-control);
  font-weight: 750;
  line-height: 1;
  white-space: nowrap;
  cursor: pointer;
  transition: transform .2s ease, background-color .2s ease, border-color .2s ease, box-shadow .2s ease;
}
.button:hover { transform: translateY(-2px); }
.button:active { transform: translateY(0) scale(.98); }
.button-small { min-height: 42px; padding: 10px 17px; font-size: 14px; }
.button-primary { background: var(--blue); color: #fff; box-shadow: 0 10px 24px rgba(37, 99, 235, .22); }
.button-primary:hover { background: var(--blue-hover); box-shadow: 0 13px 30px rgba(37, 99, 235, .27); }
.button-secondary { border-color: var(--line-strong); background: var(--surface); color: var(--ink); }
.button-secondary:hover { border-color: #9db3cf; background: #f9fbfe; }
.button:focus-visible, a:focus-visible, button:focus-visible { outline: 3px solid var(--focus); outline-offset: 3px; }

.hero { position: relative; overflow: hidden; padding: 82px 0 0; background: linear-gradient(180deg, #fbfcfe 0%, var(--page) 100%); }
.hero::before { content: ""; position: absolute; width: 660px; height: 660px; right: -260px; top: -320px; border-radius: 50%; background: rgba(37, 99, 235, .08); filter: blur(2px); pointer-events: none; }
.hero-grid { position: relative; display: grid; grid-template-columns: .9fr 1.1fr; align-items: center; gap: 46px; }
.hero-copy { padding-bottom: 50px; }
.eyebrow { margin: 0 0 17px; color: var(--blue); font-size: 13px; font-weight: 800; letter-spacing: .08em; }
h1, h2, h3, p { text-wrap: pretty; }
h1 { max-width: 570px; margin: 0; color: var(--ink); font-size: clamp(44px, 4.1vw, 54px); font-weight: 820; line-height: 1.1; letter-spacing: -.05em; }
h1 em { color: var(--blue); font-style: normal; }
.hero-lead { max-width: 520px; margin: 24px 0 0; color: var(--ink-soft); font-size: 18px; line-height: 1.75; }
.hero-actions { display: flex; gap: 12px; margin-top: 31px; }

.product-stage { position: relative; align-self: end; min-width: 0; padding: 24px 0 48px; }
.product-stage::before { content: ""; position: absolute; inset: 7% 0 11% 7%; border-radius: 48% 52% 42% 58%; background: linear-gradient(145deg, rgba(37, 99, 235, .14), rgba(37, 99, 235, .02)); transform: rotate(-4deg); }
.product-frame { position: relative; aspect-ratio: 1.54; overflow: hidden; border: 1px solid var(--line-strong); border-radius: var(--radius); background: var(--surface); box-shadow: var(--shadow); transform: rotate(1deg); transition: transform .45s cubic-bezier(.16, 1, .3, 1), box-shadow .45s ease; }
.product-frame:hover { transform: rotate(0) translateY(-4px); box-shadow: 0 30px 82px rgba(26, 61, 108, .17); }
.product-frame img { width: 122%; max-width: none; height: auto; margin: -4.5% 0 0 -11%; }
.product-callout { position: absolute; left: -25px; bottom: 18px; min-width: 128px; padding: 16px 18px; border: 1px solid rgba(255,255,255,.78); border-radius: 16px; background: rgba(255, 255, 255, .94); box-shadow: var(--shadow-soft); backdrop-filter: blur(12px); }
.product-callout strong { display: block; color: var(--blue); font-size: 34px; line-height: 1; letter-spacing: -.04em; font-variant-numeric: tabular-nums; }
.product-callout span { display: block; margin-top: 6px; color: var(--ink-soft); font-size: 12px; font-weight: 700; }

.fact-row { position: relative; display: grid; grid-template-columns: repeat(4, 1fr); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.fact-row div { padding: 21px 24px; border-right: 1px solid var(--line); }
.fact-row div:first-child { padding-left: 0; }
.fact-row div:last-child { border-right: 0; }
.fact-row strong, .fact-row span { display: block; }
.fact-row strong { color: var(--ink); font-size: 16px; }
.fact-row span { margin-top: 2px; color: var(--muted); font-size: 13px; }

.section { padding: 104px 0; }
.section-heading { max-width: 760px; margin-bottom: 48px; }
.section-heading.align-left { text-align: left; }
.section-heading h2, .feature-intro h2, .workflow-intro h2, .support-layout h2, .final-cta h2 { margin: 0; color: var(--ink); font-size: clamp(34px, 4vw, 50px); font-weight: 800; line-height: 1.18; letter-spacing: -.045em; }
.section-heading p, .feature-intro > p, .workflow-intro > p, .support-layout > div > p, .final-cta p { max-width: 650px; margin: 17px 0 0; color: var(--ink-soft); font-size: 17px; }

.scene-section { background: var(--surface); }
.scene-grid { display: grid; grid-template-columns: 1.35fr .65fr .65fr; grid-template-rows: auto auto; gap: 18px; }
.scene-main { position: relative; grid-row: span 2; min-height: 560px; overflow: hidden; border-radius: var(--radius); background: var(--surface-blue); }
.scene-main::after { content: ""; position: absolute; inset: 0; z-index: 1; background: linear-gradient(180deg, var(--surface-blue) 0%, rgba(231, 239, 255, .94) 36%, rgba(231, 239, 255, 0) 68%); pointer-events: none; }
.scene-main .scene-copy { position: relative; z-index: 2; max-width: 480px; padding: 38px; }
.scene-main h3, .scene-item h3 { margin: 9px 0 12px; color: var(--ink); font-size: 26px; line-height: 1.25; letter-spacing: -.025em; }
.scene-main p, .scene-item p { margin: 0; color: var(--ink-soft); }
.scene-main a { display: inline-block; margin-top: 20px; color: var(--blue); font-size: 14px; font-weight: 800; }
.scene-visual { position: absolute; inset: auto 0 0; overflow: hidden; }
.scene-main .scene-visual img { position: relative; width: 100%; height: auto; max-width: none; object-fit: contain; object-position: center bottom; mix-blend-mode: multiply; }
.scene-kicker { color: var(--blue); font-size: 12px; font-weight: 800; letter-spacing: .05em; }
.scene-item { position: relative; min-height: 270px; overflow: hidden; padding: 30px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--page); }
.scene-item p { font-size: 14px; }
.scene-health { grid-column: span 2; padding-right: 180px; background: var(--blue-deep); border-color: var(--blue-deep); }
.scene-health .scene-kicker { color: #a9c7ff; }
.scene-health h3 { color: #fff; }
.scene-health p { color: #cbd9ec; }
.score-visual { position: absolute; right: 28px; top: 50%; width: 122px; height: 122px; display: grid; place-content: center; border: 10px solid rgba(255,255,255,.14); border-top-color: #8db6ff; border-right-color: #8db6ff; border-radius: 50%; text-align: center; transform: translateY(-50%) rotate(10deg); }
.score-visual strong, .score-visual span { display: block; transform: rotate(-10deg); }
.score-visual strong { color: #fff; font-size: 38px; line-height: 1; }
.score-visual span { margin-top: 5px; color: #c8daf8; font-size: 10px; }
.scene-accent { background: var(--surface-blue); border-color: transparent; }

.feature-section { background: var(--page); }
.feature-layout { display: grid; grid-template-columns: .78fr 1.22fr; gap: 78px; align-items: start; }
.feature-intro { position: sticky; top: calc(var(--header-height) + 38px); }
.feature-intro > p { margin-bottom: 30px; }
.feature-note { padding: 24px; border-radius: var(--radius); background: var(--surface); box-shadow: var(--shadow-soft); }
.feature-note strong { font-size: 16px; }
.feature-note p { margin: 8px 0 12px; color: var(--muted); font-size: 13px; }
.feature-note a { color: var(--blue); font-size: 13px; font-weight: 800; }
.feature-groups { display: grid; gap: 28px; }
.feature-group { display: grid; grid-template-columns: 105px 1fr 1fr; gap: 28px; padding-top: 22px; border-top: 1px solid var(--line-strong); }
.feature-group > span { color: var(--blue); font-size: 13px; font-weight: 800; }
.feature-group article { min-height: 120px; }
.feature-group h3 { margin: 0 0 8px; color: var(--ink); font-size: 20px; }
.feature-group p { margin: 0; color: var(--ink-soft); font-size: 14px; }

.workflow-section { background: var(--surface); }
.workflow-layout { display: grid; grid-template-columns: .82fr 1.18fr; gap: 84px; align-items: start; }
.workflow-intro .button { margin-top: 26px; }
.workflow-list { margin: 0; padding: 0; list-style: none; }
.workflow-list li { display: grid; grid-template-columns: 64px 1fr; gap: 20px; padding: 27px 0; border-bottom: 1px solid var(--line); }
.workflow-list li:first-child { padding-top: 0; }
.workflow-list li:last-child { border-bottom: 0; }
.workflow-list > li > span { color: var(--blue); font-size: 14px; font-weight: 800; font-variant-numeric: tabular-nums; }
.workflow-list h3 { margin: 0 0 6px; color: var(--ink); font-size: 21px; }
.workflow-list p { margin: 0; color: var(--ink-soft); font-size: 14px; }
.workflow-list a { display: inline-block; margin-top: 12px; color: var(--blue); font-size: 13px; font-weight: 800; }

.pricing-section { background: var(--page); }
.pricing-heading { display: grid; grid-template-columns: 1fr .7fr; align-items: end; gap: 54px; max-width: none; }
.pricing-heading p { margin: 0 0 4px; }
.price-grid { display: grid; grid-template-columns: 1.08fr .92fr; gap: 18px; }
.price-card { position: relative; padding: 34px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); }
.price-free { border-color: #9cbcff; box-shadow: var(--shadow-soft); }
.price-vip { background: #f0f3f7; }
.plan-top { display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.plan-top span { color: var(--ink); font-size: 19px; font-weight: 800; }
.plan-top b { color: var(--blue); font-size: 12px; }
.price { display: flex; align-items: baseline; gap: 10px; min-height: 56px; margin: 22px 0 8px; }
.price strong { color: var(--ink); font-size: 43px; line-height: 1; letter-spacing: -.045em; font-variant-numeric: tabular-nums; }
.price-vip .price strong { font-size: 34px; }
.price span { color: var(--muted); font-size: 13px; }
.price-card > p { min-height: 54px; margin: 0; color: var(--ink-soft); font-size: 14px; }
.price-card ul { display: grid; grid-template-columns: 1fr 1fr; gap: 12px 24px; min-height: 94px; margin: 24px 0 28px; padding: 22px 0 0; border-top: 1px solid var(--line); list-style: none; }
.price-card li { position: relative; padding-left: 18px; color: var(--ink-soft); font-size: 13px; }
.price-card li::before { content: ""; position: absolute; left: 0; top: .7em; width: 8px; height: 2px; background: var(--blue); }
.price-card .button { width: 100%; }
.price-footnote { margin: 18px 0 0; color: var(--muted); font-size: 12px; text-align: center; }

.support-section { background: var(--surface); }
.support-layout { display: grid; grid-template-columns: 1fr .75fr; gap: 84px; align-items: center; }
.support-email { display: inline-block; margin-top: 24px; color: var(--blue); font-size: clamp(22px, 3vw, 34px); font-weight: 800; letter-spacing: -.02em; }
.support-action { padding: 32px; border-radius: var(--radius); background: var(--surface-blue); }
.support-action h3 { margin: 0; color: var(--ink); font-size: 22px; }
.support-action p { margin: 10px 0 22px; color: var(--ink-soft); }

.final-cta { padding: 72px 0; background: var(--surface-blue); }
.final-layout { display: flex; align-items: center; justify-content: space-between; gap: 48px; }
.final-cta h2 { max-width: 700px; }
.final-actions { display: flex; gap: 12px; flex: 0 0 auto; }

footer { padding: 62px 0 26px; border-top: 1px solid var(--line); background: #e9eef5; color: var(--ink-soft); }
.footer-grid { display: grid; grid-template-columns: 1.65fr repeat(3, 1fr); gap: 54px; }
.footer-about p { max-width: 330px; margin: 18px 0 0; font-size: 14px; }
.footer-brand .brand-cn { font-size: 16px; }
.footer-brand .brand-name { font-size: 12px; }
.footer-grid > div:not(:first-child) { display: flex; flex-direction: column; align-items: flex-start; gap: 9px; font-size: 13px; }
.footer-grid b { margin-bottom: 4px; color: var(--ink); }
.footer-grid a:hover { color: var(--blue); }
.copyright { margin-top: 45px; padding-top: 20px; border-top: 1px solid var(--line-strong); color: var(--muted); font-size: 12px; }

.reveal { opacity: 0; transform: translateY(20px); transition: opacity .55s cubic-bezier(.16, 1, .3, 1), transform .55s cubic-bezier(.16, 1, .3, 1); }
.reveal.is-visible { opacity: 1; transform: none; }

@media (max-width: 1080px) {
  #site-nav { gap: 16px; }
  .nav-download { display: none; }
  .hero-grid { grid-template-columns: .9fr 1.1fr; gap: 32px; }
  h1 { font-size: 46px; }
  .scene-grid { grid-template-columns: 1fr 1fr; }
  .scene-main { grid-column: span 2; grid-row: auto; min-height: 520px; }
  .scene-health { grid-column: span 2; }
  .feature-layout, .workflow-layout { gap: 48px; }
}

@media (max-width: 860px) {
  :root { --header-height: 66px; }
  .container { width: min(calc(100% - 36px), var(--container)); }
  .site-header { backdrop-filter: none; background: rgba(246,248,251,.98); }
  .nav-wrap { min-height: var(--header-height); }
  .menu-button { display: block; }
  #site-nav { display: none; position: absolute; left: 18px; right: 18px; top: calc(var(--header-height) - 1px); flex-direction: column; align-items: stretch; gap: 0; padding: 10px; border: 1px solid var(--line); border-radius: 16px; background: var(--surface); box-shadow: var(--shadow); }
  #site-nav.open { display: flex; }
  #site-nav a { min-height: 46px; display: flex; align-items: center; padding: 0 12px; }
  #site-nav a::after { display: none; }
  .nav-actions { margin-left: 0; }
  .desktop-cta { display: none; }
  .nav-download { display: inline-block; }
  .hero { padding-top: 58px; }
  .hero-grid { grid-template-columns: 1fr; gap: 24px; }
  .hero-copy { padding-bottom: 10px; }
  h1 { max-width: 680px; font-size: clamp(42px, 8vw, 58px); }
  .product-stage { width: min(100%, 760px); margin-inline: auto; padding-bottom: 58px; }
  .fact-row { grid-template-columns: 1fr 1fr; }
  .fact-row div:nth-child(2) { border-right: 0; }
  .fact-row div:nth-child(-n+2) { border-bottom: 1px solid var(--line); }
  .fact-row div:first-child, .fact-row div:nth-child(3) { padding-left: 18px; }
  .feature-layout, .workflow-layout, .support-layout { grid-template-columns: 1fr; gap: 48px; }
  .feature-intro { position: static; }
  .pricing-heading { display: block; }
  .pricing-heading p { margin-top: 17px; }
  .price-grid { grid-template-columns: 1fr; }
  .final-layout { display: block; }
  .final-actions { margin-top: 28px; }
  .footer-grid { grid-template-columns: 1.4fr 1fr 1fr; }
  .footer-grid > div:last-child { display: none; }
}

@media (max-width: 640px) {
  .container { width: min(calc(100% - 28px), var(--container)); }
  .brand img { width: 36px; height: 36px; }
  .brand-cn { font-size: 16px; }
  .brand-name { font-size: 12px; }
  .nav-download { display: none; }
  .hero { padding-top: 48px; }
  .eyebrow { font-size: 12px; }
  h1 { font-size: 40px; }
  .hero-lead { font-size: 16px; }
  .hero-actions { flex-direction: column; }
  .hero-actions .button { width: 100%; }
  .product-stage { padding-top: 12px; padding-bottom: 50px; }
  .product-frame { border-radius: 16px; transform: none; }
  .product-callout { left: 12px; bottom: 22px; min-width: 104px; padding: 12px 14px; }
  .product-callout strong { font-size: 28px; }
  .section { padding: 76px 0; }
  .section-heading { margin-bottom: 34px; }
  .section-heading h2, .feature-intro h2, .workflow-intro h2, .support-layout h2, .final-cta h2 { font-size: 34px; }
  .section-heading p, .feature-intro > p, .workflow-intro > p, .support-layout > div > p, .final-cta p { font-size: 16px; }
  .scene-grid { grid-template-columns: 1fr; }
  .scene-main, .scene-health { grid-column: auto; }
  .scene-main { min-height: 500px; }
  .scene-main .scene-copy { padding: 28px; }
  .scene-main .scene-visual img { width: 100%; }
  .scene-main::after { background: linear-gradient(180deg, var(--surface-blue) 0%, rgba(231, 239, 255, .96) 42%, rgba(231, 239, 255, .28) 70%, rgba(231, 239, 255, 0) 84%); }
  .scene-item { min-height: 240px; }
  .scene-health { padding-right: 145px; }
  .score-visual { width: 98px; height: 98px; right: 20px; border-width: 8px; }
  .score-visual strong { font-size: 31px; }
  .feature-group { grid-template-columns: 1fr; gap: 14px; }
  .feature-group article { min-height: auto; }
  .feature-group > span { margin-bottom: 4px; }
  .workflow-list li { grid-template-columns: 46px 1fr; gap: 14px; }
  .price-card { padding: 26px 22px; }
  .price-card ul { grid-template-columns: 1fr; min-height: auto; }
  .support-email { overflow-wrap: anywhere; }
  .support-action { padding: 26px 22px; }
  .final-cta { padding: 60px 0; }
  .final-actions { flex-direction: column; }
  .final-actions .button { width: 100%; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 36px 24px; }
  .footer-about { grid-column: span 2; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; }
  .reveal { opacity: 1; transform: none; }
}

@media (prefers-color-scheme: dark) {
  :root {
    color-scheme: dark;
    --page: #0e1726;
    --surface: #131f31;
    --surface-soft: #19273a;
    --surface-blue: #17284a;
    --ink: #eff5ff;
    --ink-soft: #b8c6d9;
    --muted: #91a1b6;
    --line: #2a3950;
    --line-strong: #3a4c66;
    --blue-soft: #1b3564;
    --blue-deep: #10244c;
    --shadow: 0 24px 70px rgba(0, 0, 0, .3);
    --shadow-soft: 0 12px 36px rgba(0, 0, 0, .22);
  }
  .site-header { background: rgba(14, 23, 38, .92); }
  .hero { background: linear-gradient(180deg, #111c2c 0%, var(--page) 100%); }
  .frame-bar { background: #1b2a3e; }
  .frame-bar span { background: #64748b; }
  .product-callout { border-color: rgba(255,255,255,.12); background: rgba(19,31,49,.95); }
  .product-stage::before { background: linear-gradient(145deg, rgba(37,99,235,.28), rgba(37,99,235,.04)); }
  .button-secondary { background: var(--surface); }
  .button-secondary:hover { background: #1a2a40; }
  .scene-main .scene-visual img { opacity: .82; mix-blend-mode: screen; }
  .scene-main::after { background: linear-gradient(180deg, var(--surface-blue) 0%, rgba(23, 40, 74, .94) 40%, rgba(23, 40, 74, 0) 72%); }
  .price-vip { background: #172235; }
  footer { background: #101b2b; }
}