@charset "UTF-8";

:root {
  color-scheme: dark;
  --paper: #090c10;
  --surface: #10151b;
  --raised: #171e26;
  --ink: #eef1f4;
  --muted: #a1a9b4;
  --quiet: #858f9b;
  --accent: #b5ccdc;
  --line: #edf2f514;
  --wrap: 1600px;
  --header-height: 88px;
  --font: "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", -apple-system, BlinkMacSystemFont, sans-serif;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: calc(var(--header-height) + 24px); }
body { margin: 0; color: var(--ink); background: var(--paper); font: 400 14px/1.7 var(--font); -webkit-font-smoothing: antialiased; }
a { color: inherit; text-decoration: none; }
button { color: inherit; font: inherit; cursor: pointer; }
a, button { -webkit-tap-highlight-color: transparent; }
a:focus-visible, button:focus-visible, [tabindex]:focus-visible { outline: 2px solid var(--accent); outline-offset: 6px; }
button[hidden], nav[hidden] { display: none; }
img { display: block; max-width: 100%; }
svg { display: block; }
h1, h2, h3, p { margin-top: 0; }
::selection { color: var(--paper); background: var(--accent); }
.wrap { width: min(calc(100% - clamp(48px, 10vw, 160px)), var(--wrap)); margin-inline: auto; }
.skip-link { position: fixed; z-index: 20; top: 12px; left: 12px; padding: 12px 16px; background: var(--ink); color: var(--paper); transform: translateY(-160%); }
.skip-link:focus { transform: none; }

/* 导航保持安静，让粒子品牌字标成为首屏唯一的视觉重点。 */
.site-header { position: sticky; top: 0; z-index: 10; height: var(--header-height); background: var(--paper); border-bottom: 1px solid transparent; transition: border-color 180ms var(--ease); }
.site-header.scrolled { border-color: var(--line); }
.header-inner { height: 100%; display: flex; align-items: center; justify-content: space-between; gap: 32px; }
.brand { display: flex; align-items: center; gap: 12px; flex-shrink: 0; }
.brand-symbol { width: 32px; height: 32px; fill: var(--ink); }
.brand-type { display: flex; flex-direction: column; gap: 4px; }
.brand-type strong { font-size: 21px; font-weight: 500; line-height: 1.1; }
.brand-type strong span { margin-left: 8px; font-size: 12px; font-weight: 400; color: var(--muted); }
.brand-english { font: 10px/1.2 Arial, sans-serif; color: var(--quiet); letter-spacing: .08em; }
.desktop-nav { display: flex; gap: 36px; font-size: 13px; color: var(--muted); }
.desktop-nav a { position: relative; padding-block: 12px; transition: color 160ms var(--ease); }
.desktop-nav a:hover, .desktop-nav a[aria-current] { color: var(--ink); }
.desktop-nav a[aria-current]::after { content: ""; position: absolute; bottom: 4px; height: 1px; left: 0; right: 0; background: var(--ink); }
.header-contact { min-height: 40px; padding: 8px 16px; display: inline-flex; align-items: center; gap: 32px; border: 1px solid #edf2f526; border-radius: 4px; font-size: 12px; transition: background 160ms var(--ease); }
.header-contact:hover { background: var(--raised); }
.header-contact > span { font-size: 18px; }
.menu-toggle { display: none; background: none; border: 0; width: 44px; height: 44px; padding: 10px; }
.menu-toggle span { display: block; height: 1px; background: var(--ink); margin: 7px 0; transition: transform 180ms var(--ease); }
.mobile-nav { position: absolute; top: 100%; left: 0; right: 0; padding: 16px 24px 24px; background: var(--paper); border-bottom: 1px solid var(--line); }
.mobile-nav a { display: block; padding-block: 12px; font-size: 15px; }

/* 宽幅构图使用两行标题和横向标识，统一留白而不堆叠装饰。 */
.hero { position: relative; display: grid; grid-template-columns: 44% 56%; min-height: max(640px, calc(100svh - var(--header-height) - 88px)); }
.hero-copy { display: flex; align-items: flex-start; justify-content: center; flex-direction: column; padding-bottom: 80px; min-width: 0; }
.eyebrow { margin: 0; color: var(--quiet); font-size: 12px; font-weight: 400; line-height: 1.7; }
.hero .eyebrow { font-size: 13px; color: var(--muted); }
h1 { margin: 28px 0 24px; font-size: clamp(52px, 5vw, 84px); font-weight: 400; line-height: 1.32; letter-spacing: -.04em; }
h1 > span { color: #b8c1ca; }
.hero-description { margin-bottom: 36px; color: var(--muted); font-size: 17px; line-height: 1.9; }
.hero-actions { display: flex; align-items: center; gap: 32px; }
.button { display: inline-flex; align-items: center; justify-content: space-between; gap: 40px; min-height: 48px; padding: 12px 20px; border: 1px solid transparent; border-radius: 4px; font-size: 13px; transition: background 180ms var(--ease), color 180ms var(--ease); }
.button > span { font-size: 20px; line-height: 1; }
.button-dark { color: var(--paper); background: var(--ink); }
.button-dark:hover { background: #ccd7df; }
.text-link { display: inline-flex; align-items: center; gap: 20px; padding-block: 8px; font-size: 13px; color: var(--muted); transition: color 160ms var(--ease); }
.text-link > span { font-size: 20px; }
.text-link:hover { color: var(--ink); }
.hero-bottom { position: absolute; bottom: 28px; left: 0; right: 0; display: flex; align-items: center; justify-content: space-between; font-size: 11px; color: var(--quiet); }
.hero-bottom a { display: inline-flex; align-items: center; gap: 16px; }
.scroll-icon { font: 20px/1 Arial, sans-serif; color: var(--ink); }
.hero-art { position: relative; min-width: 0; }
.art-caption { position: absolute; bottom: 116px; left: 8%; right: 4%; display: flex; justify-content: space-between; gap: 16px; padding-top: 16px; border-top: 1px solid var(--line); color: var(--quiet); font-size: 11px; }
.art-caption > span:first-child { font-family: Arial, sans-serif; }
#particle-logo-canvas { position: fixed; inset: 0; z-index: 3; width: 100%; height: 100%; pointer-events: none; }
.particle-logo-fallback { position: absolute; inset: 0 0 72px; display: flex; align-items: center; justify-content: center; gap: 32px; color: var(--ink); }
.fallback-monogram { width: clamp(44px, 5.5vw, 76px); height: clamp(44px, 5.5vw, 76px); fill: currentColor; }
.fallback-wordmark { display: flex; flex-direction: column; gap: 8px; }
.fallback-wordmark strong { font-size: clamp(36px, 4.5vw, 68px); font-weight: 400; line-height: 1.2; }
.particle-logo-stage[data-particles-ready="true"] .particle-logo-fallback { visibility: hidden; }
.expertise-strip { border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.expertise-strip .wrap { min-height: 88px; display: flex; align-items: center; justify-content: space-between; gap: 24px; font-size: 13px; color: #bec6ce; }
.strip-label { color: var(--quiet); font-size: 12px; margin-right: 32px; }
.strip-dot { width: 1px; height: 12px; background: var(--line); }

.section { padding-block: 112px; }
.section-heading { display: flex; align-items: flex-end; justify-content: space-between; gap: 48px; margin-bottom: 48px; }
.section-kicker { margin-bottom: 20px; font-size: 11px; color: var(--quiet); }
h2 { margin-bottom: 0; font-size: clamp(30px, 2.8vw, 44px); font-weight: 400; line-height: 1.5; letter-spacing: -.02em; }
.section-intro { margin: 0 0 4px; color: var(--muted); font-size: 13px; line-height: 1.9; }
.service-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 40px; }
.service-card { position: relative; padding: 32px 0 24px; border-top: 1px solid #edf2f526; }
.card-number { position: absolute; top: 32px; right: 0; font: 12px/1 Arial, sans-serif; color: var(--quiet); }
.service-icon { width: 40px; height: 40px; margin-bottom: 32px; fill: none; stroke: var(--muted); stroke-width: 1.4; }
.service-card h3 { margin-bottom: 16px; font-size: 23px; font-weight: 400; }
.service-card p { max-width: 360px; margin-bottom: 24px; color: var(--muted); font-size: 13px; line-height: 1.95; }
.service-tags { color: var(--quiet); font-size: 11px; }
.card-link { display: flex; align-items: center; justify-content: space-between; margin-top: 28px; padding-top: 20px; border-top: 1px solid var(--line); font-size: 12px; color: var(--muted); transition: color 160ms var(--ease); }
.card-link > span { font-size: 20px; }
.card-link:hover { color: var(--ink); }
.solutions-section { padding-block: 112px; background: var(--surface); }
.solution-tabs { display: flex; border-bottom: 1px solid var(--line); margin-bottom: 40px; }
.solution-tab { position: relative; flex: 1; text-align: left; padding: 16px 12px 20px 0; border: 0; background: none; color: var(--quiet); font-size: 14px; transition: color 160ms var(--ease); }
.solution-tab[aria-selected="true"] { color: var(--ink); }
.solution-tab[aria-selected="true"]::after { content: ""; position: absolute; left: 0; bottom: -1px; width: calc(100% - 40px); height: 1px; background: var(--accent); }
.solution-panel { display: grid; grid-template-columns: .85fr 1fr; gap: 80px; align-items: center; }
.solution-category { color: var(--quiet); font-size: 12px; }
.solution-copy h3 { margin: 20px 0; font-size: 32px; font-weight: 400; line-height: 1.5; white-space: pre-line; }
.solution-copy > p { max-width: 440px; margin-bottom: 24px; color: var(--muted); font-size: 13px; line-height: 2; }
.solution-copy ul { padding: 0; margin: 0 0 20px; list-style: none; }
.solution-copy li { display: flex; align-items: baseline; gap: 12px; margin-block: 12px; color: var(--muted); font-size: 12px; }
.solution-copy li::before { content: ""; width: 3px; height: 3px; flex-shrink: 0; background: var(--quiet); }
.solution-visual { padding: 24px 28px 20px; background: var(--paper); border: 1px solid var(--line); border-radius: 8px; }
.diagram-header { display: flex; align-items: center; gap: 8px; font-size: 12px; color: var(--muted); }
.diagram-mark { width: 8px; height: 8px; border: 1px solid var(--muted); transform: rotate(45deg); }
.diagram-note { margin-left: auto; color: var(--quiet); font-size: 11px; }
.workflow-diagram { position: relative; isolation: isolate; height: 320px; margin-block: 24px; }
.diagram-node { position: absolute; z-index: 1; display: grid; grid-template-columns: 24px 1fr; min-width: 168px; padding: 16px; background: var(--surface); border: 1px solid #edf2f51c; border-radius: 4px; }
.diagram-node > span { grid-row: span 2; padding-top: 2px; color: var(--quiet); font: 11px/1.7 Arial, sans-serif; }
.diagram-node strong { font-size: 12px; font-weight: 400; }
.diagram-node small { font-size: 11px; margin-top: 4px; color: var(--quiet); }
.node-a { left: 0; top: 12px; }
.node-b { right: 0; top: 56px; }
.node-c { left: 0; bottom: 48px; }
.node-d { right: 0; bottom: 4px; }
.diagram-line { position: absolute; z-index: -1; left: 20%; right: 20%; top: 25%; bottom: 20%; border: 1px solid #edf2f51a; border-radius: 28px; transform: rotate(12deg); }
.diagram-line.line-b { left: 30%; right: 30%; top: 20%; bottom: 15%; transform: rotate(-20deg); }
.diagram-line.line-c { top: 39%; bottom: 38%; border-color: #b5ccdc30; transform: rotate(-20deg); }
.diagram-hub { position: absolute; z-index: 2; top: 45%; left: 50%; width: 112px; height: 96px; transform: translate(-50%, -50%); display: flex; align-items: center; justify-content: center; flex-direction: column; gap: 12px; background: var(--raised); border: 1px solid #edf2f526; border-radius: 6px; }
.diagram-hub svg { width: 28px; height: 28px; fill: var(--ink); }
.diagram-hub > span { color: var(--muted); font-size: 11px; }
.diagram-footer { display: flex; justify-content: space-between; padding-top: 16px; border-top: 1px solid var(--line); font-size: 11px; color: var(--quiet); }
.about-section { display: grid; grid-template-columns: 1fr 1fr; align-items: center; gap: 112px; }
.about-art { position: relative; height: 560px; overflow: hidden; background: var(--surface); }
.about-art > img { width: 100%; height: 100%; object-fit: cover; filter: grayscale(1); opacity: .85; }
.about-location { position: absolute; top: 32px; left: 32px; display: flex; flex-direction: column; gap: 8px; }
.about-location > span { color: var(--muted); font: 11px/1.4 Arial, sans-serif; }
.about-location > strong { font-size: 12px; font-weight: 400; }
.about-art-title { position: absolute; left: 32px; bottom: 32px; font-size: 32px; font-weight: 400; line-height: 1.5; }
.about-copy h2 { margin-bottom: 28px; }
.about-copy > p:not(.eyebrow) { margin-bottom: 16px; color: var(--muted); font-size: 13px; line-height: 2; }
.about-principles { margin-top: 28px; padding-top: 8px; border-top: 1px solid var(--line); }
.about-principles > div { display: flex; justify-content: space-between; gap: 16px; margin-block: 20px; font-size: 12px; }
.about-principles p { margin: 0; color: var(--muted); }
.about-copy .text-link { margin-top: 16px; }
.process-section { padding-block: 96px 112px; background: var(--surface); }
.process-list { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 40px; margin: 0; padding: 16px 0 0; list-style: none; }
.process-list li { padding-top: 24px; border-top: 1px solid #edf2f526; }
.process-number { display: block; margin-bottom: 32px; font: 12px/1.4 Arial, sans-serif; color: var(--quiet); }
.process-list h3 { margin-bottom: 16px; font-size: 20px; font-weight: 400; }
.process-list p { margin-bottom: 0; color: var(--muted); font-size: 12px; line-height: 2; }
.contact-section { padding-block: 112px; }
.contact-top { display: flex; align-items: center; justify-content: space-between; }
.contact-top .eyebrow { margin-bottom: 0; }
.contact-spark { font-size: 40px; line-height: 1; color: var(--muted); }
.contact-main { display: grid; grid-template-columns: 1.25fr 1fr; align-items: start; gap: 112px; margin-top: 32px; }
.contact-main h2 { font-size: clamp(36px, 4vw, 60px); line-height: 1.5; }
.contact-aside > p:first-child { margin-bottom: 28px; color: var(--muted); font-size: 14px; line-height: 2; }
.contact-address { margin: 24px 0 0; color: var(--quiet); font-size: 12px; }
.contact-details { display: flex; align-items: flex-start; flex-direction: column; gap: 12px; margin-top: 20px; }
.contact-details:empty { display: none; }
.contact-details a { font: 17px/1.5 Arial, sans-serif; }
.contact-details a:hover { color: var(--accent); }
.site-footer { border-top: 1px solid var(--line); }
.footer-top { display: flex; align-items: center; gap: 40px; min-height: 112px; border-bottom: 1px solid var(--line); }
.footer-brand { font-size: 24px; font-weight: 400; }
.footer-brand > span { margin-left: 12px; font-size: 13px; color: var(--muted); }
.footer-top p { margin: 0; color: var(--quiet); font-size: 12px; }
.back-to-top { display: flex; align-items: center; gap: 16px; margin-left: auto; font-size: 12px; color: var(--muted); }
.back-to-top > span { font-size: 20px; }
.footer-bottom { display: flex; justify-content: space-between; gap: 24px; padding-block: 24px; color: var(--quiet); font-size: 11px; }
.footer-legal, #filing-links { display: flex; flex-wrap: wrap; gap: 24px; align-items: center; }
#filing-links:empty { display: none; }
.footer-legal a:hover { color: var(--ink); }
.legal-main { max-width: 850px; padding-block: 80px 112px; }
.legal-main h1 { margin-bottom: 24px; font-size: 40px; }
.legal-main h2 { margin: 40px 0 12px; font-size: 24px; }
.legal-main p, .legal-main li { color: var(--muted); font-size: 14px; line-height: 2; }
.legal-back { display: inline-block; margin-bottom: 32px; border-bottom: 1px solid var(--muted); font-size: 13px; }
.legal-date { font-size: 12px !important; }
.legal-main a { color: var(--ink); }

.reveal-ready { opacity: 0; transform: translateY(8px); transition: opacity 450ms var(--ease), transform 450ms var(--ease); }
.reveal-ready.is-visible { opacity: 1; transform: none; }

@media (min-width: 1800px) {
  :root { --header-height: 104px; }
  .hero { min-height: min(960px, calc(100svh - var(--header-height) - 96px)); }
  .expertise-strip .wrap { min-height: 96px; }
}
@media (max-width: 1100px) {
  .desktop-nav { gap: 24px; font-size: 12px; }
  .header-inner { gap: 24px; }
  .header-contact { gap: 20px; padding-inline: 12px; }
  .brand-type strong { font-size: 20px; }
  .hero-description { font-size: 15px; }
  .hero-actions { gap: 24px; }
  .button { gap: 28px; }
  .service-grid { gap: 28px; }
  .solution-panel { gap: 48px; }
  .diagram-node { min-width: 140px; padding: 12px; grid-template-columns: 20px 1fr; }
  .about-section, .contact-main { gap: 64px; }
  .strip-label { margin-right: 0; }
  .expertise-strip .wrap { gap: 16px; font-size: 12px; }
  .process-list { gap: 28px; }
}
@media (max-width: 850px) {
  :root { --header-height: 80px; }
  .desktop-nav, .header-contact { display: none; }
  .menu-toggle { display: block; margin-right: -8px; }
  .menu-toggle[aria-expanded="true"] span:first-child { transform: translateY(4px) rotate(45deg); }
  .menu-toggle[aria-expanded="true"] span:last-child { transform: translateY(-4px) rotate(-45deg); }
  .hero { grid-template-columns: 1fr 1fr; min-height: 600px; }
  h1 { font-size: 44px; }
  .hero-description { font-size: 14px; }
  .hero-actions { gap: 16px; }
  .hero-actions .text-link { font-size: 12px; gap: 12px; }
  .button { gap: 20px; padding-inline: 16px; font-size: 12px; }
  .art-caption { left: 4%; right: 0; font-size: 11px; }
  .art-caption > span:last-child { display: none; }
  .expertise-strip .wrap { flex-wrap: wrap; justify-content: center; padding-block: 20px; gap: 12px 20px; font-size: 12px; }
  .strip-label { flex-basis: 100%; text-align: center; font-size: 11px; }
  .section, .solutions-section, .process-section, .contact-section { padding-block: 80px; }
  .section-heading { gap: 32px; }
  .section-intro { font-size: 12px; }
  .service-grid { gap: 24px; }
  .service-card h3 { font-size: 20px; }
  .service-card p { font-size: 12px; }
  .solution-panel { grid-template-columns: 1fr; gap: 32px; }
  .solution-copy > p { max-width: 100%; }
  .solution-visual { max-width: 600px; }
  .about-section { gap: 40px; }
  .about-art { height: 540px; }
  .about-principles > div { display: block; }
  .about-principles p { margin-top: 4px; }
  .process-list { gap: 24px; }
  .contact-main { gap: 48px; }
  .footer-top p { display: none; }
}
@media (max-width: 650px) {
  :root { --header-height: 76px; }
  .wrap { width: calc(100% - 40px); }
  .brand-symbol { width: 28px; height: 28px; }
  .brand { gap: 12px; }
  .brand-type strong { font-size: 20px; }
  .brand-type strong span { font-size: 11px; margin-left: 6px; }
  .brand-english { font-size: 10px; }
  .hero { display: flex; flex-direction: column; min-height: 0; gap: 24px; padding-top: 48px; padding-bottom: 32px; }
  .hero-copy { padding-bottom: 0; }
  .hero .eyebrow { font-size: 11px; }
  h1 { font-size: clamp(36px, 10vw, 48px); margin: 24px 0; line-height: 1.4; }
  .hero-description { font-size: 14px; line-height: 1.9; margin-bottom: 28px; }
  .hero-actions { gap: 24px; }
  .button { min-height: 48px; padding: 12px 16px; gap: 28px; }
  .hero-actions .text-link { font-size: 12px; }
  .hero-bottom { display: none; }
  .hero-art { flex: none; height: 252px; }
  .art-caption { left: 0; right: 0; bottom: 12px; padding-top: 12px; font-size: 11px; }
  .art-caption > span:last-child { display: block; }
  .particle-logo-fallback { inset: 0 0 36px; gap: 20px; }
  .fallback-wordmark strong { font-size: 36px; }
  .expertise-strip .wrap { column-gap: 12px; font-size: 11px; }
  .strip-dot { height: 8px; }
  .section, .solutions-section, .process-section, .contact-section { padding-block: 64px; }
  .section-heading { display: block; margin-bottom: 32px; }
  .section-kicker { font-size: 11px; margin-bottom: 16px; }
  h2 { font-size: 28px; line-height: 1.55; }
  .section-intro { margin-top: 20px; font-size: 12px; }
  .service-grid { grid-template-columns: 1fr; gap: 8px; }
  .service-card { padding: 28px 0 24px; }
  .service-icon { width: 36px; height: 36px; margin-bottom: 24px; }
  .service-card h3 { font-size: 22px; }
  .service-card p { max-width: none; font-size: 13px; margin-bottom: 20px; }
  .card-number { top: 28px; }
  .card-link { margin-top: 24px; padding-top: 16px; }
  .solution-tabs { overflow-x: auto; gap: 24px; margin-bottom: 28px; }
  .solution-tab { flex: none; min-width: max-content; padding: 16px 0; font-size: 12px; }
  .solution-tab[aria-selected="true"]::after { width: 100%; }
  .solution-copy h3 { font-size: 26px; margin-block: 16px; }
  .solution-copy > p { font-size: 13px; }
  .solution-visual { padding: 20px 16px 16px; }
  .diagram-header { font-size: 11px; }
  .diagram-note { font-size: 11px; }
  .workflow-diagram { height: 300px; margin-block: 20px; }
  .diagram-node { min-width: 136px; padding: 12px; grid-template-columns: 20px 1fr; }
  .diagram-node strong, .diagram-node small { font-size: 11px; }
  .diagram-hub { width: 104px; height: 88px; }
  .diagram-hub > span { font-size: 11px; }
  .diagram-footer { font-size: 11px; }
  .about-section { display: flex; flex-direction: column-reverse; gap: 40px; }
  .about-copy > p:not(.eyebrow) { font-size: 13px; }
  .about-art { width: 100%; height: 400px; }
  .about-principles > div { display: flex; font-size: 11px; gap: 12px; }
  .about-principles p { margin: 0; }
  .about-location { top: 24px; left: 24px; }
  .about-art-title { left: 24px; bottom: 24px; font-size: 28px; }
  .process-list { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 36px 24px; padding-top: 8px; }
  .process-list li { padding-top: 20px; }
  .process-number { margin-bottom: 24px; }
  .process-list h3 { font-size: 18px; }
  .process-list p { font-size: 11px; }
  .contact-top .eyebrow { font-size: 11px; max-width: 80%; }
  .contact-spark { font-size: 32px; }
  .contact-main { grid-template-columns: 1fr; gap: 28px; margin-top: 24px; }
  .contact-main h2 { font-size: 32px; }
  .contact-aside > p:first-child { font-size: 13px; }
  .contact-details a { font-size: 17px; }
  .footer-top { min-height: 96px; gap: 16px; }
  .footer-brand { font-size: 20px; }
  .footer-brand > span { font-size: 11px; margin-left: 8px; }
  .back-to-top { gap: 12px; font-size: 11px; }
  .footer-bottom { flex-direction: column; gap: 12px; font-size: 11px; padding-block: 24px; }
  .footer-legal { gap: 20px; }
  .legal-main { padding-block: 48px 64px; }
  .legal-main h1 { font-size: 32px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; animation: none !important; }
  .reveal-ready { opacity: 1; transform: none; }
}