@font-face { font-family: "APITest Sans"; src: url("fonts/noto-sans-sc.woff2") format("woff2"); font-style: normal; font-weight: 400 900; font-display: swap; }
:root { --paper: #fafaf8; --ink: #101112; --muted: #606875; --line: #e1e3e8; --blue: #4364e9; --tint: #f2f5fd; }
* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 28px; }
body { margin: 0; color: var(--ink); background: var(--paper); font-family: "APITest Sans", "Microsoft YaHei", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif; font-size: 16px; -webkit-font-smoothing: antialiased; }
a { color: inherit; text-decoration: none; }
button { font: inherit; cursor: pointer; }
button, a { -webkit-tap-highlight-color: transparent; }
button:focus-visible, a:focus-visible, summary:focus-visible, [tabindex]:focus-visible { outline: 3px solid var(--blue); outline-offset: 5px; }
h1, h2, h3, p, ul, ol, dl, dd { margin: 0; }
ul, ol { padding: 0; list-style: none; }
img { display: block; flex-shrink: 0; }
[hidden] { display: none !important; }
.container { width: min(1280px, calc(100% - 160px)); margin-inline: auto; }
.wide-container { width: min(1360px, calc(100% - 80px)); margin-inline: auto; }
.section-space { margin-top: 112px; }
.skip-link { position: absolute; top: 8px; left: 16px; z-index: 10; padding: 12px 20px; color: white; background: var(--blue); transform: translateY(-150%); }
.skip-link:focus { transform: translateY(0); }
.site-header { min-height: 84px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.wordmark { font-size: 27px; font-weight: 800; letter-spacing: -1.4px; }
.brand-logo { position: relative; display: inline-block; width: 142px; height: 23px; overflow: hidden; vertical-align: middle; }
.brand-logo-large { width: 160px; height: 26px; }
.brand-logo img { position: absolute; top: -71.8%; left: -7.8%; width: 117.2%; max-width: none; height: auto; }
.site-nav { display: flex; align-items: center; gap: 34px; font-size: 15px; }
.site-nav > a:not(.button) { color: #50545e; transition: color 160ms; }
.site-nav > a:not(.button):hover { color: var(--blue); }
.menu-toggle { display: none; padding: 8px; border: 0; background: none; }
.button { display: inline-flex; align-items: center; justify-content: center; gap: 14px; min-height: 56px; padding: 14px 28px; color: #fff; background: var(--blue); border: 1px solid var(--blue); border-radius: 8px; font-weight: 600; line-height: 1.4; transition: background 160ms, transform 160ms; }
.button img { filter: brightness(0) invert(1); }
.button:hover { background: #395be8; transform: translateY(-2px); }
.button-small { min-height: 40px; padding: 9px 16px; gap: 9px; font-size: 14px; border-radius: 6px; }
.text-link { display: inline-flex; align-items: center; gap: 10px; font-weight: 600; }
.text-link:hover { color: var(--blue); }
.hero { display: grid; grid-template-columns: minmax(0, 1fr) 320px; gap: 60px; align-items: center; padding-top: 30px; padding-bottom: 44px; }
.eyebrow { color: var(--blue); font-size: 18px; font-weight: 600; letter-spacing: .02em; line-height: 1.6; }
.hero h1 { margin-top: 8px; font-size: clamp(64px, 9.1vw, 132px); font-weight: 900; line-height: 1.08; letter-spacing: -.045em; }
.hero-description { margin-top: 25px; font-size: 23px; line-height: 1.7; color: #4e525c; }
.hero-actions { display: flex; align-items: center; gap: 32px; margin-top: 30px; }
.hero-questions { border-left: 1px solid var(--line); padding-left: 44px; align-self: start; margin-top: 28px; }
.hero-questions li { padding: 34px 0; font-size: 31px; line-height: 1.4; font-weight: 500; letter-spacing: -.035em; }
.hero-questions li + li { border-top: 1px solid var(--line); }
.report-stage { position: relative; padding: 32px 40px; background: var(--tint); border-radius: 12px; }
.report-heading { display: flex; align-items: center; gap: 20px; flex-wrap: wrap; }
h2 { font-size: clamp(30px, 3.5vw, 48px); font-weight: 800; letter-spacing: -.04em; line-height: 1.3; }
.demo-label { padding: 7px 13px; color: #365ada; background: #e5ecff; border-radius: 20px; font-size: 13px; font-weight: 600; white-space: nowrap; }
.report-description { margin-top: 14px; color: var(--muted); font-size: 17px; line-height: 1.75; }
.report-toolbar { position: absolute; top: 37px; right: 40px; display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.report-tabs { display: flex; gap: 4px; }
.report-tabs button { border: 0; padding: 9px 15px; background: transparent; color: #5f6675; border-radius: 6px; font-size: 14px; }
.report-tabs button[aria-selected="true"] { color: #355bde; background: #e4ebff; font-weight: 600; }
.report-tabs button:hover { color: var(--blue); }
.report-body { margin-top: 26px; padding: 28px 30px 22px; background: white; border-radius: 10px; }
.metrics { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 20px; padding-bottom: 28px; border-bottom: 1px solid #eef0f5; }
.metrics > div + div { border-left: 1px solid #eef0f5; padding-left: 22px; }
.metrics dt { font-size: 16px; color: #5b6271; font-weight: 500; }
.metrics dd { margin-top: 10px; font-size: 42px; font-weight: 700; line-height: 1.15; letter-spacing: -.03em; font-variant-numeric: tabular-nums; }
.metrics dd span { font-size: 24px; margin-left: 4px; }
.metrics p { margin-top: 9px; color: var(--muted); font-size: 13px; line-height: 1.5; }
.report-detail { display: grid; grid-template-columns: minmax(0, 2.25fr) minmax(0, 1fr); gap: 30px; padding-top: 25px; }
.report-detail > * { min-width: 0; }
.report-detail h3 { font-size: 17px; line-height: 1.6; font-weight: 600; }
.chart-column h3 span { font-weight: 400; }
.chart-wrap { position: relative; height: 186px; margin-top: 16px; }
.chart-wrap canvas { max-width: 100%; }
.chart-caption { color: var(--muted); font-size: 12px; line-height: 1.5; margin-top: 8px; }
.interpretation { border-left: 1px solid #eef0f5; padding-left: 27px; }
.interpretation h3 { display: flex; align-items: center; gap: 10px; }
.interpretation h3 img { filter: invert(39%) sepia(99%) saturate(2600%) hue-rotate(214deg) brightness(108%); }
.interpretation > p { margin-top: 16px; color: var(--muted); font-size: 15px; line-height: 1.85; }
.interpretation .insight-boundary { margin-top: 14px; font-size: 12px; color: var(--muted); line-height: 1.65; }
.protocol-preview { min-height: 260px; }
.tool-flow { display: grid; grid-template-columns: repeat(2, 1fr); counter-reset: tool-step; gap: 18px; margin: 24px 0; }
.tool-flow li { display: flex; align-items: center; gap: 12px; padding: 15px 0; border-bottom: 1px solid var(--line); font-size: 15px; }
.tool-flow li::before { counter-increment: tool-step; content: counter(tool-step, decimal-leading-zero); color: var(--blue); font-size: 13px; font-weight: 600; }
.method { margin-top: 45px; }
.method-intro { display: grid; grid-template-columns: 1fr 1fr; gap: 42px; align-items: center; }
.method-intro > div > p { margin-top: 16px; color: var(--muted); font-size: 16px; line-height: 1.8; }
.baseline-flow { padding-left: 35px; border-left: 1px solid var(--line); }
.baseline-flow h3 { font-size: 17px; font-weight: 600; }
.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; margin-top: 18px; }
.steps li { display: flex; flex-direction: column; align-items: center; text-align: center; gap: 9px; }
.step-number { display: flex; align-items: center; justify-content: center; width: 48px; height: 48px; color: #355bde; background: #e8edff; border-radius: 50%; font-size: 23px; font-weight: 500; }
.steps strong { font-size: 15px; font-weight: 500; white-space: nowrap; }
.steps small { color: var(--muted); font-size: 13px; }
.method-highlights { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; margin-top: 35px; padding-top: 28px; border-top: 1px solid var(--line); }
.method-highlights article { display: flex; align-items: flex-start; gap: 22px; }
.method-highlights article + article { padding-left: 35px; border-left: 1px solid var(--line); }
.method-highlights h3 { font-size: 24px; font-weight: 700; line-height: 1.4; }
.method-highlights p { margin-top: 7px; font-size: 15px; color: var(--muted); line-height: 1.75; }
.intervals { display: flex; justify-content: space-between; gap: 14px; margin-top: 16px; padding-bottom: 10px; border-bottom: 3px solid #d9e2ff; color: #646c7e; font-size: 14px; }
.intervals li:last-child { color: var(--blue); font-weight: 600; }
.method-highlights .small-copy { font-size: 13px; margin-top: 10px; }
.protocol-names { display: flex; gap: 12px; margin-top: 15px; }
.protocol-names span { padding: 5px 14px; background: #edf1fc; border-radius: 18px; font-size: 14px; color: #596981; }
.protocol-names span:first-child { color: #355bde; }
.section-heading > h2 { margin-top: 12px; }
.section-heading > p:last-child:not(.eyebrow) { margin-top: 18px; color: var(--muted); font-size: 17px; line-height: 1.8; }
.feature-list { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); column-gap: 72px; margin-top: 36px; }
.feature { display: flex; align-items: flex-start; gap: 22px; padding: 27px 0; border-bottom: 1px solid var(--line); }
.feature img { margin-top: 3px; }
.feature h3 { font-size: 22px; font-weight: 600; line-height: 1.45; }
.feature p { margin-top: 8px; color: var(--muted); font-size: 15px; line-height: 1.8; }
.evidence-list { display: grid; grid-template-columns: repeat(3, 1fr); gap: 40px; margin-top: 36px; }
.evidence-list article { padding-top: 24px; border-top: 1px solid #bbc2d2; }
.evidence-number { color: var(--blue); font-size: 14px; font-weight: 600; }
.evidence-list h3 { margin-top: 21px; font-size: 24px; font-weight: 600; }
.evidence-list p { margin-top: 15px; color: var(--muted); font-size: 16px; line-height: 1.85; }
.start-section { padding: 45px; border-radius: 12px; background: var(--tint); }
.start-steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 38px; margin-top: 36px; }
.start-steps li { display: flex; gap: 18px; align-items: flex-start; }
.start-steps li > span { padding-top: 1px; color: var(--blue); font-size: 30px; font-weight: 600; }
.start-steps h3 { font-size: 21px; font-weight: 600; }
.start-steps p { margin-top: 11px; color: var(--muted); font-size: 15px; line-height: 1.8; }
.trust-note { margin-top: 38px; padding-top: 25px; border-top: 1px solid #dfe5f1; display: flex; gap: 15px; align-items: center; }
.trust-note p { color: var(--muted); font-size: 14px; line-height: 1.8; }
.faq { display: grid; grid-template-columns: .72fr 1.28fr; gap: 76px; }
.faq-list { border-top: 1px solid var(--line); }
.faq details { border-bottom: 1px solid var(--line); }
.faq summary { padding: 23px 0; display: flex; justify-content: space-between; gap: 22px; align-items: center; font-size: 18px; font-weight: 500; cursor: pointer; list-style: none; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary img { transition: transform 180ms; }
.faq details[open] summary img { transform: rotate(180deg); }
.faq details > p { padding: 0 26px 24px 0; color: var(--muted); font-size: 15px; line-height: 1.9; }
.closing { text-align: center; padding: 66px 0 88px; border-top: 1px solid var(--line); }
.closing h2 { margin-top: 16px; font-size: clamp(36px, 5vw, 70px); }
.closing > p:not(.eyebrow) { margin-top: 22px; color: var(--muted); font-size: 18px; line-height: 1.8; }
.closing .button { margin-top: 30px; }
.closing small { display: block; margin-top: 17px; color: var(--muted); font-size: 13px; }
.site-footer { min-height: 104px; border-top: 1px solid var(--line); display: flex; align-items: center; gap: 36px; justify-content: space-between; }
.site-footer .brand-logo { width: 142px; height: 23px; }
.site-footer p { color: var(--muted); font-size: 13px; }
.footer-copyright { display: flex; align-items: center; flex-wrap: wrap; gap: 8px 24px; line-height: 1.7; }
.footer-copyright > * { white-space: nowrap; }
.footer-copyright a:hover { color: var(--blue); }
.footer-top { display: flex; align-items: center; gap: 8px; font-size: 13px; color: #646c7a; }
.noscript-note { padding: 20px; text-align: center; color: var(--muted); }
@media (max-width: 1390px) {
  .report-toolbar { position: static; margin: 22px 0 16px; }
  .report-body { margin-top: 0; }
}
@media (max-width: 1150px) {
  .container { width: calc(100% - 96px); }
  .wide-container { width: calc(100% - 48px); }
  .hero { grid-template-columns: minmax(0, 1fr) 255px; gap: 28px; }
  .hero-questions { padding-left: 32px; }
  .hero-questions li { font-size: 26px; }
  .hero-description { font-size: 18px; }
  .site-nav { gap: 23px; }
  .metrics dd { font-size: 35px; }
  .report-stage { padding: 32px; }
  .report-body { padding: 24px; }
  .method-intro { gap: 28px; }
  .baseline-flow, .method-highlights article + article { padding-left: 24px; }
  .steps strong { font-size: 13px; }
}
@media (max-width: 820px) {
  .container { width: calc(100% - 48px); }
  .site-header { min-height: 76px; position: relative; }
  .wordmark { font-size: 24px; }
  .menu-toggle { display: inline-flex; }
  .site-nav { display: none; position: absolute; top: 66px; left: 0; right: 0; padding: 20px; background: var(--paper); border: 1px solid var(--line); border-radius: 10px; z-index: 5; flex-direction: column; align-items: stretch; gap: 0; }
  .site-nav.is-open { display: flex; }
  .site-nav > a:not(.button) { padding: 13px 0; }
  .site-nav .button { margin-top: 12px; }
  .hero { grid-template-columns: 1fr; gap: 35px; padding-top: 25px; padding-bottom: 45px; }
  .hero h1 { font-size: clamp(48px, 12vw, 88px); line-height: 1.16; }
  .eyebrow { font-size: 15px; }
  .hero-description { margin-top: 21px; font-size: 17px; line-height: 1.8; }
  .hero-actions { margin-top: 26px; gap: 24px; }
  .hero-questions { display: grid; grid-template-columns: repeat(3, 1fr); border-left: 0; padding: 20px 0 0; border-top: 1px solid var(--line); }
  .hero-questions { margin-top: 0; }
  .hero-questions li { font-size: 18px; padding: 0 12px; text-align: center; }
  .hero-questions li:first-child { padding-left: 0; }
  .hero-questions li + li { border-top: 0; border-left: 1px solid var(--line); }
  .report-stage { padding: 26px; }
  .report-detail { grid-template-columns: minmax(0, 1fr); gap: 22px; }
  .interpretation { border-left: 0; padding: 19px 0 0; border-top: 1px solid #eef0f5; }
  .metrics { gap: 18px; }
  .metrics > div + div { padding-left: 14px; }
  .metrics dt { font-size: 14px; }
  .metrics dd { font-size: 28px; }
  .metrics dd span { font-size: 18px; }
  .method-intro { grid-template-columns: 1fr; gap: 25px; }
  .baseline-flow { padding: 24px 0 0; border-left: 0; border-top: 1px solid var(--line); }
  .method-highlights { gap: 25px; }
  .method-highlights article { gap: 14px; }
  .method-highlights h3 { font-size: 20px; }
  .section-space { margin-top: 76px; }
  .feature-list { column-gap: 35px; }
  .feature { gap: 16px; }
  .feature h3 { font-size: 19px; }
  .evidence-list { gap: 26px; }
  .evidence-list h3 { font-size: 21px; }
  .evidence-list p { font-size: 14px; }
  .start-section { padding: 30px; }
  .start-steps { grid-template-columns: 1fr; gap: 28px; }
  .faq { grid-template-columns: 1fr; gap: 28px; }
  .closing { padding-bottom: 65px; }
  .site-footer { flex-wrap: wrap; padding: 25px 0; gap: 20px; }
}
@media (max-width: 540px) {
  .container { width: calc(100% - 40px); }
  .wide-container { width: calc(100% - 24px); }
  .hero h1 { font-size: clamp(40px, 12vw, 65px); }
  .hero-actions { gap: 18px; flex-wrap: wrap; }
  .button { padding: 13px 19px; min-height: 50px; font-size: 15px; gap: 10px; }
  .hero-questions li { font-size: 13px; padding-inline: 5px; }
  .hero-description { font-size: 15px; }
  .hero-description br { display: none; }
  .report-stage { padding: 24px 16px 14px; }
  .report-heading { gap: 13px; }
  h2 { font-size: 30px; }
  .report-heading h2 { max-width: 300px; }
  .report-description { font-size: 14px; }
  .report-description br { display: none; }
  .report-toolbar { flex-wrap: wrap; gap: 9px; }
  .report-tabs { gap: 2px; }
  .report-tabs button { padding: 9px 10px; font-size: 13px; }
  .report-body { padding: 20px 16px; }
  .metrics { grid-template-columns: repeat(2, minmax(0, 1fr)); column-gap: 15px; row-gap: 24px; padding-bottom: 24px; }
  .metrics > div + div { padding-left: 0; border-left: 0; }
  .metrics > div:nth-child(even) { padding-left: 14px; border-left: 1px solid #eef0f5; }
  .metrics dd { font-size: 32px; }
  .metrics p { font-size: 11px; }
  .chart-wrap { height: 180px; }
  .interpretation > p { font-size: 14px; }
  .method { margin-top: 36px; }
  .method-intro > div > p { font-size: 14px; }
  .method-intro > div > p br { display: none; }
  .baseline-flow h3 { font-size: 14px; }
  .steps { gap: 4px; }
  .step-number { width: 40px; height: 40px; font-size: 20px; }
  .steps strong { font-size: 11px; }
  .steps small { font-size: 11px; }
  .method-highlights { grid-template-columns: 1fr; gap: 24px; }
  .method-highlights article + article { padding: 24px 0 0; border-left: 0; border-top: 1px solid var(--line); }
  .section-icon { width: 30px; height: 30px; }
  .feature-list { grid-template-columns: 1fr; margin-top: 22px; }
  .feature { padding: 24px 0; }
  .feature p { font-size: 14px; }
  .section-heading > p:last-child:not(.eyebrow) { font-size: 15px; }
  .evidence-list { grid-template-columns: 1fr; gap: 30px; margin-top: 28px; }
  .evidence-list h3 { margin-top: 12px; }
  .evidence-list p { margin-top: 11px; }
  .start-section { padding: 27px 22px; }
  .trust-note { align-items: flex-start; }
  .trust-note p { font-size: 12px; }
  .faq summary { font-size: 16px; padding-block: 20px; }
  .faq details > p { font-size: 14px; }
  .closing h2 { font-size: 38px; }
  .closing > p:not(.eyebrow) { font-size: 15px; }
  .closing small { font-size: 11px; }
  .site-footer p { width: 100%; order: 3; font-size: 11px; }
  .site-footer .wordmark { font-size: 21px; }
}
.scroll-reveal { opacity: 0; transform: translateY(22px); transition: opacity 600ms ease, transform 600ms cubic-bezier(.2,.7,.2,1); transition-delay: var(--reveal-delay, 0ms); }
.scroll-reveal.is-visible, .scroll-reveal:focus-within { opacity: 1; transform: none; }
.hero-questions li:nth-child(2), .steps li:nth-child(2), .method-highlights article:nth-child(2), .feature:nth-child(even), .evidence-list article:nth-child(2), .start-steps li:nth-child(2) { --reveal-delay: 100ms; }
.hero-questions li:nth-child(3), .steps li:nth-child(3), .evidence-list article:nth-child(3), .start-steps li:nth-child(3) { --reveal-delay: 200ms; }
.steps li:nth-child(4) { --reveal-delay: 300ms; }
.feature.is-visible > img, .method-highlights .is-visible > img, .steps .is-visible .step-number, .start-steps .is-visible > span {
  animation: icon-enter 650ms cubic-bezier(.2,.7,.2,1) both;
  animation-delay: calc(var(--reveal-delay, 0ms) + 100ms);
}
@keyframes icon-enter {
  from { opacity: 0; transform: translateY(8px) scale(.75) rotate(-8deg); }
  to { opacity: 1; transform: none; }
}