:root {
  color-scheme: light;
  --ink: #0b1220;
  --ink-soft: #24344d;
  --muted: #607089;
  --line: #dce4ee;
  --surface: #ffffff;
  --surface-soft: #f4f7fb;
  --blue: #0f6fff;
  --blue-dark: #0755ce;
  --cyan: #69d7ff;
  --lime: #b8f34a;
  --shadow-sm: 0 12px 34px rgba(25, 45, 80, .08);
  --shadow-lg: 0 38px 90px rgba(4, 12, 28, .2);
  --radius-sm: 12px;
  --radius-md: 20px;
  --radius-lg: 30px;
  --container: 1180px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 86px; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--surface);
  font-family: "Microsoft YaHei UI", "PingFang SC", "Noto Sans CJK SC", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
img, svg { display: block; }
button, a { -webkit-tap-highlight-color: transparent; }
button { font: inherit; }
:focus-visible { outline: 3px solid rgba(15, 111, 255, .42); outline-offset: 3px; }

.skip-link {
  position: fixed;
  z-index: 2000;
  top: 12px;
  left: 12px;
  padding: 10px 16px;
  border-radius: 8px;
  color: #fff;
  background: var(--blue);
  transform: translateY(-150%);
  transition: transform .2s ease-out;
}
.skip-link:focus { transform: translateY(0); }
.container { width: min(calc(100% - 40px), var(--container)); margin-inline: auto; }

.site-header {
  position: fixed;
  z-index: 1000;
  inset: 0 0 auto;
  border-bottom: 1px solid transparent;
  background: rgba(255, 255, 255, .82);
  backdrop-filter: blur(18px);
  transition: border-color .2s ease, box-shadow .2s ease, background .2s ease;
}
.site-header.scrolled { border-color: rgba(15, 32, 57, .08); box-shadow: 0 10px 35px rgba(22, 41, 75, .06); background: rgba(255,255,255,.94); }
.header-inner { min-height: 72px; display: flex; align-items: center; justify-content: space-between; gap: 28px; }
.brand { display: inline-flex; align-items: center; gap: 11px; font-size: 19px; font-weight: 760; letter-spacing: -.02em; }
.brand img { width: 36px; height: 36px; border-radius: 10px; }
.site-nav { display: flex; align-items: center; gap: 28px; font-size: 14px; font-weight: 620; color: #40516b; }
.site-nav > a:not(.button) { position: relative; padding-block: 24px; }
.site-nav > a:not(.button)::after { content: ""; position: absolute; inset: auto 0 18px; height: 2px; background: var(--blue); transform: scaleX(0); transition: transform .2s ease-out; }
.site-nav > a:not(.button):hover { color: var(--ink); }
.site-nav > a:not(.button):hover::after { transform: scaleX(1); }
.menu-toggle { display: none; width: 46px; height: 46px; border: 0; border-radius: 12px; color: var(--ink); background: var(--surface-soft); align-items: center; justify-content: center; cursor: pointer; }
.menu-toggle svg { width: 24px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; }

.button { min-height: 48px; display: inline-flex; align-items: center; justify-content: center; gap: 10px; padding: 12px 20px; border: 1px solid transparent; border-radius: 11px; font-weight: 720; line-height: 1.2; cursor: pointer; transition: transform .2s ease-out, box-shadow .2s ease-out, background-color .2s ease-out, border-color .2s ease-out; }
.button:hover { transform: translateY(-2px); }
.button:active { transform: translateY(0); }
.button svg { width: 18px; height: 18px; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
.button-small { min-height: 40px; padding: 10px 16px; border-radius: 9px; }
.button-primary { color: #fff; background: var(--blue); box-shadow: 0 12px 28px rgba(15, 111, 255, .24); }
.button-primary:hover { background: var(--blue-dark); box-shadow: 0 16px 32px rgba(15, 111, 255, .3); }
.button-secondary { border-color: #cfd9e6; color: var(--ink); background: rgba(255, 255, 255, .76); }
.button-secondary:hover { border-color: #9fb0c5; background: #fff; }
.button-light { color: var(--ink); background: #fff; box-shadow: 0 12px 28px rgba(0,0,0,.13); }
.button-block { width: 100%; }

.hero { position: relative; min-height: 850px; padding: 164px 0 110px; overflow: hidden; background: linear-gradient(180deg, #f8fbff 0%, #fff 84%); }
.hero::before { content: ""; position: absolute; inset: 0; opacity: .28; background-image: linear-gradient(#b9c7da 1px, transparent 1px), linear-gradient(90deg, #b9c7da 1px, transparent 1px); background-size: 48px 48px; mask-image: linear-gradient(to bottom, #000, transparent 73%); }
.hero-glow { position: absolute; border-radius: 50%; filter: blur(2px); pointer-events: none; }
.hero-glow-one { width: 620px; height: 620px; top: -260px; right: 3%; background: radial-gradient(circle, rgba(100, 207, 255, .2), transparent 68%); }
.hero-glow-two { width: 540px; height: 540px; bottom: -290px; left: -120px; background: radial-gradient(circle, rgba(15, 111, 255, .1), transparent 70%); }
.hero-grid { position: relative; display: grid; grid-template-columns: .88fr 1.12fr; align-items: center; gap: 54px; }
.eyebrow, .kicker { color: var(--blue); font-size: 13px; font-weight: 800; letter-spacing: .12em; text-transform: uppercase; }
.eyebrow { display: inline-flex; align-items: center; gap: 10px; margin-bottom: 24px; padding: 8px 12px; border: 1px solid rgba(15,111,255,.16); border-radius: 999px; background: rgba(255,255,255,.7); letter-spacing: .06em; }
.eyebrow > span { width: 7px; height: 7px; border-radius: 50%; background: var(--blue); box-shadow: 0 0 0 5px rgba(15,111,255,.11); }
.hero h1 { max-width: 650px; margin: 0; font-size: clamp(44px, 5.25vw, 76px); line-height: 1.08; letter-spacing: -.055em; font-weight: 780; }
.hero h1 strong { color: var(--blue); font-weight: inherit; }
.hero-lead { max-width: 610px; margin: 28px 0 0; color: #4d5f78; font-size: 18px; line-height: 1.8; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 13px; margin-top: 36px; }
.hero-meta { display: flex; flex-wrap: wrap; gap: 12px 26px; margin: 30px 0 0; padding: 0; list-style: none; color: #53647c; font-size: 13px; font-weight: 640; }
.hero-meta li { display: flex; align-items: center; gap: 8px; }
.hero-meta svg { width: 16px; height: 16px; fill: none; stroke: var(--blue); stroke-width: 2.2; }
.status-dot { width: 8px; height: 8px; border-radius: 50%; background: #20ae68; box-shadow: 0 0 0 5px rgba(32,174,104,.11); }

.drawing-stage { position: relative; min-width: 660px; border: 1px solid rgba(109, 130, 159, .28); border-radius: 20px; background: #f7f9fc; box-shadow: var(--shadow-lg); transform: perspective(1500px) rotateY(-4deg) rotateX(2deg); transform-origin: left center; }
.stage-topbar { height: 48px; display: flex; align-items: center; gap: 14px; padding: 0 16px; border-bottom: 1px solid #dce3ed; color: #53647a; background: #fff; border-radius: 20px 20px 0 0; font-size: 11px; font-weight: 680; }
.window-dots { display: flex; gap: 5px; margin-right: 4px; }
.window-dots i { width: 8px; height: 8px; border-radius: 50%; background: #d5dde8; }
.window-dots i:first-child { background: #ff8e84; }.window-dots i:nth-child(2) { background: #ffd166; }.window-dots i:last-child { background: #51d08b; }
.stage-state { margin-left: auto; display: flex; align-items: center; gap: 6px; color: #299663; }
.stage-state i { width: 6px; height: 6px; border-radius: 50%; background: currentColor; }
.stage-body { display: grid; grid-template-columns: 48px 1fr; min-height: 500px; }
.stage-toolbar { display: flex; flex-direction: column; align-items: center; gap: 10px; padding-top: 14px; border-right: 1px solid #dce3ed; background: #eef2f7; border-radius: 0 0 0 20px; }
.tool { width: 32px; height: 32px; display: grid; place-items: center; border-radius: 8px; color: #687a92; }
.tool.active { color: #fff; background: var(--blue); box-shadow: 0 8px 18px rgba(15,111,255,.25); }
.tool svg { width: 17px; fill: none; stroke: currentColor; stroke-width: 1.7; stroke-linecap: round; stroke-linejoin: round; }
.sheet { margin: 18px; overflow: hidden; border: 1px solid #d3dce8; border-radius: 5px; background: #fff; box-shadow: 0 12px 35px rgba(17, 36, 65, .08); }
.technical-drawing { width: 100%; height: auto; }
.contour-visual circle { fill: var(--lime); stroke: #0f1828; stroke-width: 2; }
.floating-card { position: absolute; display: flex; align-items: center; gap: 12px; min-width: 230px; padding: 13px 15px; border: 1px solid rgba(255,255,255,.86); border-radius: 14px; color: var(--ink); background: rgba(255,255,255,.92); box-shadow: 0 18px 42px rgba(15, 32, 58, .17); backdrop-filter: blur(14px); transform: translateZ(30px); }
.floating-card svg { width: 25px; height: 25px; flex: 0 0 auto; fill: none; stroke: var(--blue); stroke-width: 1.6; stroke-linecap: round; stroke-linejoin: round; }
.floating-card span { display: grid; }
.floating-card strong { font-size: 13px; }.floating-card small { margin-top: 2px; color: #65758b; font-size: 10px; }
.floating-card-top { top: 76px; right: -44px; }.floating-card-bottom { left: -48px; bottom: 44px; }

.format-strip { position: relative; z-index: 2; border-block: 1px solid #e5ebf3; background: #fff; }
.format-grid { min-height: 88px; display: flex; align-items: center; justify-content: space-between; gap: 22px; color: #53647a; font-size: 13px; font-weight: 720; letter-spacing: .04em; }
.format-grid p { color: #95a2b4; font-size: 11px; letter-spacing: .1em; text-transform: uppercase; }
.format-grid i { width: 32px; height: 1px; background: #dce3ed; }

.section { padding: 112px 0; }
.section-heading { display: grid; grid-template-columns: 1.2fr .8fr; align-items: end; gap: 60px; margin-bottom: 52px; }
.section-heading h2, .compatibility-copy h2, .faq-intro h2, .cta-card h2 { margin: 10px 0 0; font-size: clamp(34px, 4vw, 52px); line-height: 1.18; letter-spacing: -.04em; }
.section-heading > p, .compatibility-copy > p, .faq-intro > p { margin: 0; color: var(--muted); font-size: 17px; line-height: 1.8; }
.section-heading.centered { display: block; max-width: 760px; margin-inline: auto; text-align: center; }
.section-heading.centered p { max-width: 620px; margin: 18px auto 0; }

.feature-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 20px; }
.feature-card { position: relative; min-height: 300px; padding: 30px; overflow: hidden; border: 1px solid var(--line); border-radius: var(--radius-md); background: var(--surface); transition: transform .24s ease-out, border-color .24s ease-out, box-shadow .24s ease-out; }
.feature-card:hover { transform: translateY(-5px); border-color: #b8c7da; box-shadow: var(--shadow-sm); }
.feature-card-wide { grid-column: 1 / -1; min-height: 440px; display: grid; grid-template-columns: .86fr 1.14fr; align-items: center; gap: 40px; }
.dark-card { color: #fff; border-color: #16243a; background: radial-gradient(circle at 90% 0, #193966 0, transparent 42%), #0b1220; }
.feature-index { display: block; color: var(--blue); font-family: Consolas, "SFMono-Regular", monospace; font-size: 12px; font-weight: 800; letter-spacing: .12em; }
.dark-card .feature-index { color: var(--lime); }
.feature-card h3 { margin: 30px 0 12px; font-size: 25px; line-height: 1.3; letter-spacing: -.025em; }
.feature-card p { max-width: 530px; margin: 0; color: var(--muted); }
.dark-card p { color: #acbad0; }
.feature-icon { width: 48px; height: 48px; display: grid; place-items: center; margin-bottom: 30px; border: 1px solid #d8e3f0; border-radius: 13px; color: var(--blue); background: #f3f8ff; }
.feature-icon svg { width: 24px; height: 24px; fill: none; stroke: currentColor; stroke-width: 1.65; stroke-linecap: round; stroke-linejoin: round; }
.check-list { display: grid; gap: 10px; margin: 24px 0 0; padding: 0; list-style: none; }
.check-list li { position: relative; padding-left: 26px; color: inherit; font-size: 14px; }
.check-list li::before { content: ""; position: absolute; top: .45em; left: 2px; width: 12px; height: 7px; border: solid currentColor; border-width: 0 0 2px 2px; transform: rotate(-45deg); }
.dark-card .check-list li { color: #d9e3f1; }
.contour-visual { position: relative; align-self: stretch; display: grid; place-items: center; min-height: 360px; border: 1px solid rgba(255,255,255,.09); border-radius: 16px; background-image: linear-gradient(rgba(255,255,255,.055) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,.055) 1px, transparent 1px); background-size: 24px 24px; }
.contour-visual svg { width: 90%; }.mesh-muted { stroke: #3a5275; stroke-width: 1; }.mesh-main { stroke: #d9ebff; stroke-width: 2.2; }
.contour-label { position: absolute; right: 18px; bottom: 16px; color: var(--lime); font-family: Consolas, monospace; font-size: 10px; letter-spacing: .14em; }

.workflow-section { background: var(--surface-soft); }
.workflow-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; margin: 54px 0 0; padding: 0; list-style: none; counter-reset: steps; }
.workflow-grid li { position: relative; min-height: 310px; padding: 30px; border: 1px solid #dce4ee; border-radius: var(--radius-md); background: #fff; }
.workflow-grid li:not(:last-child)::after { content: ""; position: absolute; z-index: 3; top: 65px; right: -28px; width: 38px; height: 1px; background: #b9c8da; }
.step-number { color: #96a5b8; font-family: Consolas, monospace; font-size: 12px; font-weight: 800; letter-spacing: .1em; }
.step-icon { width: 62px; height: 62px; display: grid; place-items: center; margin-top: 44px; border-radius: 18px; color: #fff; background: var(--ink); }
.step-icon svg { width: 29px; fill: none; stroke: currentColor; stroke-width: 1.55; stroke-linecap: round; stroke-linejoin: round; }
.workflow-grid h3 { margin: 24px 0 10px; font-size: 21px; }.workflow-grid p { margin: 0; color: var(--muted); font-size: 14px; }

.compatibility-section { background: #fff; }
.compatibility-grid { display: grid; grid-template-columns: 1fr 1fr; align-items: center; gap: 80px; }
.compatibility-copy > p { margin-top: 20px; }
.version-list { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; margin-top: 32px; }
.version-list div { position: relative; min-height: 120px; padding: 18px; border: 1px solid var(--line); border-radius: 14px; background: #fff; box-shadow: 0 10px 28px rgba(34,53,85,.05); }
.version-list span { display: block; font-family: Consolas, monospace; font-size: 28px; font-weight: 800; line-height: 1; }.version-list small { color: var(--muted); font-size: 11px; }.version-list i { position: absolute; right: 12px; bottom: 12px; padding: 3px 8px; border-radius: 999px; color: #18724a; background: #e9f9f1; font-size: 10px; font-style: normal; font-weight: 800; }
.compatibility-panel { position: relative; padding: 34px; border-radius: var(--radius-lg); color: #fff; background: var(--ink); box-shadow: var(--shadow-lg); }
.panel-label { color: var(--lime); font-family: Consolas, monospace; font-size: 11px; font-weight: 800; letter-spacing: .12em; }
.pipeline { display: grid; gap: 2px; margin-top: 28px; }
.pipeline > div { display: flex; align-items: center; gap: 16px; min-height: 86px; padding: 14px 16px; border: 1px solid rgba(255,255,255,.09); background: rgba(255,255,255,.035); }
.pipeline > div:first-child { border-radius: 13px 13px 0 0; }.pipeline > div:last-child { border-radius: 0 0 13px 13px; }
.pipeline b { width: 34px; height: 34px; display: grid; place-items: center; border-radius: 9px; color: var(--ink); background: var(--lime); font-family: Consolas, monospace; font-size: 11px; }
.pipeline span { display: grid; }.pipeline strong { font-size: 15px; }.pipeline small { color: #8fa0b7; font-size: 11px; }
.compatibility-panel > p { margin: 22px 0 0; color: #9bacbf; font-size: 13px; }

.plans-section { background: var(--surface-soft); }
.plan-grid { max-width: 900px; display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; margin-inline: auto; }
.plan-card { position: relative; padding: 34px; border: 1px solid var(--line); border-radius: var(--radius-md); background: #fff; }
.plan-card.featured { border: 2px solid var(--blue); box-shadow: 0 22px 60px rgba(15,111,255,.12); }
.plan-badge { position: absolute; top: 16px; right: 16px; padding: 5px 10px; border-radius: 999px; color: #fff; background: var(--blue); font-size: 10px; font-weight: 800; }
.plan-title { display: flex; align-items: flex-start; gap: 16px; }.plan-title .feature-icon { flex: 0 0 auto; margin: 0; }.plan-title h3 { margin: 1px 0 3px; font-size: 23px; }.plan-title p { margin: 0; color: var(--muted); font-size: 13px; }
.plan-card .check-list { min-height: 168px; margin-block: 30px; color: var(--ink-soft); }
.plan-note { margin: 22px 0 0; color: #7b899c; text-align: center; font-size: 12px; }

.faq-grid { display: grid; grid-template-columns: .74fr 1.26fr; gap: 86px; }
.faq-intro { position: sticky; top: 120px; align-self: start; }.faq-intro > p { margin-top: 20px; }
.accordion { border-top: 1px solid var(--line); }
.accordion details { border-bottom: 1px solid var(--line); }
.accordion summary { min-height: 78px; display: flex; align-items: center; justify-content: space-between; gap: 20px; cursor: pointer; list-style: none; font-size: 17px; font-weight: 720; }
.accordion summary::-webkit-details-marker { display: none; }
.accordion summary span { position: relative; width: 28px; height: 28px; flex: 0 0 auto; border-radius: 50%; background: var(--surface-soft); }
.accordion summary span::before, .accordion summary span::after { content: ""; position: absolute; top: 13px; left: 8px; width: 12px; height: 2px; background: var(--ink); transition: transform .2s ease; }
.accordion summary span::after { transform: rotate(90deg); }.accordion details[open] summary span::after { transform: rotate(0); }
.accordion details p { max-width: 760px; margin: -4px 48px 24px 0; color: var(--muted); }

.cta-section { padding: 30px 0 96px; }
.cta-card { position: relative; min-height: 300px; display: flex; align-items: center; justify-content: space-between; gap: 40px; padding: 52px; overflow: hidden; border-radius: var(--radius-lg); color: #fff; background: radial-gradient(circle at 76% 24%, rgba(105,215,255,.24), transparent 31%), linear-gradient(135deg, #0b1220, #0b3b7e); }
.cta-card::after { content: ""; position: absolute; width: 280px; height: 280px; right: -90px; bottom: -170px; border: 1px solid rgba(255,255,255,.2); border-radius: 50%; box-shadow: 0 0 0 44px rgba(255,255,255,.035), 0 0 0 90px rgba(255,255,255,.025); }
.cta-card > * { position: relative; z-index: 1; }.cta-card h2 { font-size: clamp(34px, 4vw, 50px); }.cta-card p { max-width: 650px; margin: 15px 0 0; color: #bdcce0; }
.kicker.light { color: var(--lime); }

.site-footer { color: #c8d3e2; background: #080e19; }
.footer-main { min-height: 170px; display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 32px; }.footer-brand { color: #fff; }.footer-main p { margin: 0; color: #77879d; font-size: 13px; }.footer-main nav { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: 24px; color: #a7b4c5; font-size: 13px; }.footer-main nav a:hover { color: #fff; }
.footer-bottom { min-height: 66px; display: flex; justify-content: space-between; align-items: center; border-top: 1px solid rgba(255,255,255,.08); color: #66768c; font-size: 11px; }

@media (max-width: 1120px) {
  .site-nav { gap: 18px; }
  .hero { min-height: auto; }
  .hero-grid { grid-template-columns: 1fr; }
  .hero-copy { max-width: 760px; }
  .drawing-stage { width: min(100%, 760px); min-width: 0; margin: 30px auto 0; transform: none; }
  .floating-card-top { right: 18px; }.floating-card-bottom { left: 18px; }
}

@media (max-width: 860px) {
  .container { width: min(calc(100% - 32px), var(--container)); }
  .menu-toggle { display: inline-flex; }
  .site-nav { position: absolute; top: calc(100% + 1px); left: 16px; right: 16px; display: none; align-items: stretch; gap: 0; padding: 12px; border: 1px solid var(--line); border-radius: 14px; background: #fff; box-shadow: var(--shadow-sm); }
  .site-nav.open { display: grid; }
  .site-nav > a:not(.button) { min-height: 48px; display: flex; align-items: center; padding: 10px 12px; border-radius: 8px; }
  .site-nav > a:not(.button)::after { display: none; }
  .site-nav > a:not(.button):hover { background: var(--surface-soft); }
  .site-nav .button { margin-top: 8px; }
  .hero { padding: 132px 0 88px; }
  .section { padding: 86px 0; }
  .section-heading, .compatibility-grid, .faq-grid { grid-template-columns: 1fr; gap: 28px; }
  .feature-card-wide { grid-template-columns: 1fr; }
  .workflow-grid { grid-template-columns: 1fr; }
  .workflow-grid li { min-height: auto; }
  .workflow-grid li:not(:last-child)::after { top: auto; bottom: -20px; right: auto; left: 60px; width: 1px; height: 22px; }
  .faq-intro { position: static; }
  .format-grid { flex-wrap: wrap; justify-content: center; padding-block: 20px; }
  .format-grid p { flex-basis: 100%; margin: 0; text-align: center; }
  .format-grid i { display: none; }
  .footer-main { grid-template-columns: 1fr; gap: 18px; padding-block: 40px; }.footer-main nav { justify-content: flex-start; }
}

@media (max-width: 620px) {
  .hero h1 { font-size: clamp(40px, 13vw, 58px); }
  .hero-lead { font-size: 16px; }
  .hero-actions { display: grid; }
  .hero-actions .button { width: 100%; }
  .hero-meta { display: grid; }
  .drawing-stage { margin-top: 8px; }
  .stage-body { grid-template-columns: 35px 1fr; min-height: 300px; }.stage-toolbar { gap: 6px; padding-top: 9px; }.tool { width: 27px; height: 27px; }.tool svg { width: 14px; }.sheet { margin: 10px; }
  .floating-card { display: none; }
  .feature-grid, .plan-grid { grid-template-columns: 1fr; }
  .feature-card-wide { grid-column: auto; min-height: auto; }
  .feature-card { min-height: auto; padding: 24px; }
  .contour-visual { min-height: 260px; }
  .section-heading h2, .compatibility-copy h2, .faq-intro h2 { font-size: 34px; }
  .version-list { grid-template-columns: 1fr; }.version-list div { min-height: 92px; }
  .compatibility-panel, .plan-card { padding: 24px; }
  .cta-card { min-height: 360px; align-items: flex-start; flex-direction: column; padding: 34px 26px; }.cta-card .button { width: 100%; }
  .footer-main nav { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }.footer-bottom { align-items: flex-start; flex-direction: column; justify-content: center; gap: 4px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
}