:root {
  --ink: #171a22;
  --muted: #626671;
  --blue: #2855eb;
  --blue-dark: #1740cb;
  --line: #e0e3e9;
  --paper: #fff;
  --soft: #f4f6fa;
  font-family: Arial, "Helvetica Neue", sans-serif;
  color: var(--ink);
  background: var(--paper);
  font-synthesis: none;
  scroll-behavior: smooth;
}
* { box-sizing: border-box; }
[hidden] { display: none !important; }
body { margin: 0; }
a { color: inherit; text-decoration: none; }
button, input, textarea { font: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
button { cursor: pointer; }
a:focus-visible, button:focus-visible, summary:focus-visible, [role="tabpanel"]:focus-visible { outline: 3px solid var(--blue); outline-offset: 6px; }
::selection { background: #dce5ff; color: var(--ink); }
h1, h2, h3, h4, p { margin-top: 0; }
h2 { font-size: clamp(2.2rem, 3.5vw, 3.25rem); line-height: 1.12; letter-spacing: -.055em; font-weight: 500; margin-bottom: 0; }
h3 { font-size: 1.5rem; line-height: 1.2; letter-spacing: -.035em; font-weight: 500; }
p { line-height: 1.7; }
section[id] { scroll-margin-top: 30px; }
.section-shell { max-width: 1440px; margin: auto; padding-left: clamp(24px, 5.4vw, 88px); padding-right: clamp(24px, 5.4vw, 88px); }
.section-space { padding-top: 105px; padding-bottom: 105px; }
.skip-link { position: fixed; top: -80px; left: 24px; background: var(--ink); color: white; padding: 16px; z-index: 100; }
.skip-link:focus { top: 16px; }
.site-header { max-width: 1440px; padding: 26px clamp(24px, 5.4vw, 88px); margin: auto; display: flex; align-items: center; gap: 32px; min-height: 110px; }
.wordmark { font-weight: 800; font-size: 2rem; letter-spacing: -1.8px; line-height: .9; display: block; white-space: nowrap; }
.brand-dot { color: var(--blue); }
.wordmark-sub { display: block; font-size: .75rem; letter-spacing: 2px; line-height: 1; margin: 9px 0 0 2px; font-weight: 500; }
.desktop-nav { display: flex; gap: 30px; margin: auto; font-size: .875rem; }
.desktop-nav a:hover, .text-link:hover, .site-footer>a:not(.wordmark):hover { text-decoration: underline; text-underline-offset: 5px; }
.header-actions { display: flex; gap: 20px; align-items: center; }
.language-button { border: 0; background: none; padding: 10px 2px; font-size: .875rem; min-height: 44px; min-width: 40px; color: var(--muted); }
.language-button:hover { color: var(--blue); }
.button { display: inline-flex; align-items: center; justify-content: center; gap: 20px; background: var(--blue); color: #fff; border: 1px solid transparent; border-radius: 6px; padding: 19px 23px; font-size: .9375rem; font-weight: 600; line-height: 1.35; min-height: 52px; }
.button:hover { background: var(--blue-dark); }
.button>span[aria-hidden] { font-size: 1.3125rem; line-height: 1; }
.button-small { padding: 13px 18px; min-height: 46px; font-size: .875rem; }
.menu-button, .mobile-nav { display: none; }
.hero { display: grid; grid-template-columns: 1.3fr 1fr; gap: clamp(32px, 5vw, 72px); align-items: center; padding-top: 66px; padding-bottom: 89px; }
.eyebrow { display: flex; align-items: center; gap: 12px; font-size: .75rem; line-height: 1.5; letter-spacing: 1.25px; font-weight: 600; margin: 0 0 29px; }
.eyebrow-line { height: 2px; width: 25px; background: var(--blue); flex-shrink: 0; }
h1 { font-size: clamp(3rem, 5.3vw, 4.8125rem); line-height: 1.06; letter-spacing: -.062em; font-weight: 500; margin: 0 0 29px; }
h1>span { color: var(--blue); }
h1>.hero-line { color: var(--ink); }
.hero-description { font-size: 1.1875rem; color: var(--muted); line-height: 1.65; max-width: 465px; margin: 0 0 30px; }
.hero-actions { display: flex; align-items: center; gap: 23px; flex-wrap: wrap; }
.text-link { font-size: .875rem; display: inline-flex; gap: 14px; align-items: center; min-height: 44px; }
.hero-note { font-size: .8125rem; color: var(--muted); margin: 22px 0 0; }
.workflow-board { min-width: 0; background: var(--soft); border: 1px solid var(--line); border-radius: 20px; padding: 27px 22px 16px; transform: rotate(-2deg); }
.board-top { font-size: .75rem; letter-spacing: .8px; color: var(--muted); display: flex; justify-content: space-between; gap: 16px; margin-bottom: 24px; font-weight: 500; }
.board-index { white-space: nowrap; }
.board-step { background: #fff; border: 1px solid var(--line); border-radius: 10px; padding: 20px 15px; display: flex; align-items: flex-start; gap: 13px; }
.step-number { font-size: .75rem; color: var(--muted); padding-top: 3px; }
.step-label { font-size: .75rem; letter-spacing: .8px; color: var(--muted); }
.board-step h2 { font-size: 1.125rem; font-weight: 500; letter-spacing: -.025em; margin: 10px 0 8px; }
.board-step p { font-size: .875rem; line-height: 1.5; color: var(--muted); margin: 0; }
.document-symbol { font-size: 1.3125rem; margin-left: auto; color: var(--muted); }
.board-connection { height: 28px; margin-left: 31px; display: flex; align-items: center; color: #6e788d; }
.board-step-blue { background: var(--blue); border-color: var(--blue); color: #fff; box-shadow: 0 10px 20px #2855eb20; }
.board-step-blue .step-number, .board-step-blue .step-label, .board-step-blue p, .board-step-blue .document-symbol { color: #e6ebff; }
.board-review { display: flex; align-items: center; gap: 13px; background: #fff; border: 1px solid var(--line); border-radius: 10px; padding: 18px 15px; }
.review-circle { width: 29px; height: 29px; flex-shrink: 0; border-radius: 50%; background: #edf1ff; color: var(--blue); display: grid; place-items: center; font-size: .9375rem; }
.board-review strong { display: block; font-size: .9375rem; font-weight: 500; margin-bottom: 5px; }
.board-review div>span { font-size: .8125rem; color: var(--muted); }
.board-review>.step-number { margin-left: auto; }
.board-caption { font-size: .75rem; color: var(--muted); letter-spacing: .8px; text-align: center; margin: 18px 0 0; }
.audience-strip { border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); display: flex; align-items: center; justify-content: space-between; gap: 24px; padding-top: 27px; padding-bottom: 27px; }
.audience-strip>span { font-size: .875rem; color: var(--muted); }
.audience-strip p { font-size: 1.0625rem; letter-spacing: -.02em; margin: 0; }
.intro { text-align: center; padding-top: 100px; padding-bottom: 95px; }
.intro .eyebrow { justify-content: center; color: var(--muted); }
.intro h2 { font-size: clamp(2rem, 3.5vw, 3.25rem); }
.muted { color: #767d8a; }
.intro>p:last-child { max-width: 600px; margin: 29px auto 0; color: var(--muted); font-size: 1.0625rem; }
.services { border-top: 1px solid var(--line); }
.section-heading { display: grid; grid-template-columns: 1.25fr 1fr; gap: 60px; align-items: end; margin-bottom: 53px; }
.section-heading .eyebrow { color: var(--muted); margin-bottom: 19px; }
.section-heading>p { max-width: 370px; margin: 0 0 5px; font-size: 1.0625rem; color: var(--muted); }
.service-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); border: 1px solid var(--line); border-radius: 14px; overflow: hidden; }
.service-card { padding: 29px 29px 23px; display: flex; flex-direction: column; }
.service-card+.service-card { border-left: 1px solid var(--line); }
.service-card:hover { background: #fafbfe; }
.service-top { display: flex; justify-content: space-between; align-items: center; color: var(--muted); font-size: .8125rem; margin-bottom: 42px; }
.service-glyph { font-size: 1.5rem; color: var(--blue); }
.service-card h3 { max-width: 245px; font-size: 1.75rem; min-height: 2.5em; margin-bottom: 21px; }
.service-card>p { font-size: 1rem; color: var(--muted); margin-bottom: 22px; }
.service-card ul { list-style: none; padding: 0; margin: auto 0 30px; }
.service-card li { font-size: .875rem; line-height: 1.6; padding: 7px 0 7px 16px; position: relative; }
.service-card li::before { content: ''; position: absolute; left: 0; top: 17px; width: 4px; height: 4px; background: var(--blue); }
.service-link { display: flex; justify-content: space-between; gap: 12px; border-top: 1px solid var(--line); padding-top: 21px; font-size: .875rem; font-weight: 600; min-height: 44px; }
.service-link:hover { color: var(--blue); }
.workflows { background: #173db5; color: #fff; }
.workflows .section-heading .eyebrow, .workflows .section-heading>p { color: #d5e0ff; }
.workflows a:focus-visible, .workflows button:focus-visible, .workflows [role="tabpanel"]:focus-visible { outline-color: #fff; }
.workflow-tabs { display: flex; gap: 9px; border-bottom: 1px solid #ffffff35; padding-bottom: 21px; margin-bottom: 38px; flex-wrap: wrap; }
.workflow-tabs button { border: 1px solid #ffffff60; background: transparent; color: #fff; border-radius: 40px; padding: 12px 20px; min-height: 46px; font-size: .875rem; }
.workflow-tabs button[aria-selected="true"] { color: #173db5; background: #fff; border-color: #fff; }
.workflow-tabs button:hover { border-color: #fff; }
.workflow-panel { display: grid; grid-template-columns: 1fr 1.15fr; gap: 70px; align-items: center; min-height: 465px; }
.example-number { display: block; color: #d5e0ff; font-size: .8125rem; margin-bottom: 27px; }
.example-context h3 { font-size: clamp(1.875rem, 2.8vw, 2.625rem); line-height: 1.17; margin: 0 0 25px; }
.example-context p { color: #d5e0ff; font-size: 1rem; margin-bottom: 28px; max-width: 350px; }
.example-label { font-size: .75rem; color: #d5e0ff; letter-spacing: .7px; line-height: 1.6; display: inline-block; }
.example-workspace { background: #eef2ff; color: var(--ink); border-radius: 13px; padding: 14px; box-shadow: 0 20px 50px #071e7030; min-width: 0; }
.sample-input { padding: 18px 18px 23px; }
.sample-tag { font-size: .75rem; letter-spacing: .7px; line-height: 1.5; font-weight: 600; color: #586077; }
.sample-input p { font-size: 1rem; line-height: 1.7; margin: 15px 0 0; }
.sample-output { border: 1px solid #dce2ef; border-radius: 8px; background: #fff; padding: 24px 20px; }
.output-title { display: flex; gap: 12px; justify-content: space-between; align-items: center; flex-wrap: wrap; }
.review-badge { color: #173db5; background: #edf2ff; border: 1px solid #dce5ff; padding: 4px 6px; font-size: .75rem; white-space: nowrap; }
.sample-output dl { display: grid; grid-template-columns: 83px 1fr; gap: 14px 16px; margin: 24px 0 0; font-size: .875rem; line-height: 1.6; }
.sample-output dt { color: var(--muted); }
.sample-output dd { margin: 0; }
.task-list { list-style: none; padding: 0; margin: 20px 0 0; }
.task-list li { display: flex; gap: 12px; padding: 13px 0; }
.task-list li+li { border-top: 1px solid var(--line); }
.task-box { width: 14px; height: 14px; border: 1px solid #9ca9c2; border-radius: 3px; flex-shrink: 0; margin-top: 3px; }
.task-list strong { display: block; font-size: .875rem; font-weight: 500; margin-bottom: 6px; }
.task-list div>span { color: var(--muted); font-size: .8125rem; line-height: 1.5; }
.sample-output h4 { font-weight: 600; font-size: 1rem; line-height: 1.5; margin: 20px 0 10px; }
.sample-output>p { font-size: .9375rem; margin-bottom: 0; }
.sample-output .source-reference { color: #173db5; font-size: .8125rem; border-top: 1px solid var(--line); padding-top: 14px; margin-top: 20px; }
.approach-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 45px; list-style: none; padding: 0; margin: 0; }
.approach-grid li { border-top: 1px solid var(--line); padding-top: 22px; }
.approach-number { color: var(--blue); font-size: .875rem; display: block; margin-bottom: 32px; }
.approach-grid h3 { font-size: 1.5rem; margin-bottom: 18px; }
.approach-grid p { font-size: 1rem; color: var(--muted); margin-bottom: 0; }
.about { background: var(--soft); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); padding-top: 60px; padding-bottom: 60px; display: grid; grid-template-columns: .45fr 1fr; gap: 45px; }
.about>.eyebrow { color: var(--muted); margin-top: 7px; }
.about h2 { font-size: clamp(2rem, 3vw, 2.625rem); }
.about p:last-child { font-size: 1rem; color: var(--muted); max-width: 590px; margin: 25px 0 0; }
.faq { display: grid; grid-template-columns: .75fr 1fr; gap: 100px; }
.faq .eyebrow { color: var(--muted); margin-bottom: 20px; }
.faq-list { border-top: 1px solid var(--line); }
.faq-list details { border-bottom: 1px solid var(--line); }
.faq-list summary { padding: 26px 0; display: flex; justify-content: space-between; align-items: center; gap: 20px; cursor: pointer; list-style: none; font-size: 1.0625rem; line-height: 1.5; }
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary>span[aria-hidden] { color: var(--blue); font-size: 1.5rem; flex-shrink: 0; }
.faq-list details[open] summary>span[aria-hidden] { transform: rotate(45deg); }
.faq-list details p { font-size: 1rem; color: var(--muted); margin: -4px 0 26px; max-width: 510px; }
.contact { background: var(--ink); color: #fff; }
.contact .eyebrow { color: #b9c4de; }
.contact h2 { font-size: clamp(2.7rem, 6vw, 5.625rem); line-height: 1.06; letter-spacing: -.055em; }
.contact h2>span:last-child { color: #95aefd; }
.contact-bottom { border-top: 1px solid #ffffff30; padding-top: 34px; margin-top: 50px; display: flex; justify-content: space-between; align-items: end; gap: 45px; }
.contact-bottom>p { max-width: 370px; color: #c2c7d2; font-size: 1rem; margin: 0; }
.contact-email { font-size: clamp(1rem, 1.75vw, 1.5rem); display: flex; align-items: center; justify-content: space-between; gap: 18px; padding: 15px 0; border-bottom: 1px solid #ffffff80; white-space: nowrap; }
.contact-email:hover { color: #aec0ff; }
.contact a:focus-visible { outline-color: white; }
.site-footer { display: flex; align-items: center; justify-content: space-between; gap: 30px; padding-top: 36px; padding-bottom: 36px; }
.site-footer p, .site-footer>a:not(.wordmark) { font-size: .8125rem; color: var(--muted); margin: 0; }
.site-footer>a:not(.wordmark) { min-height: 44px; display: flex; align-items: center; }
.back-top { gap: 18px; }
.privacy-header { border-bottom: 1px solid var(--line); }
.privacy-header .header-actions { margin-left: auto; }
.privacy-content { max-width: 850px; padding-top: 80px; padding-bottom: 80px; }
.privacy-content h1 { font-size: clamp(2.5rem, 5vw, 4rem); }
.privacy-content h2 { font-size: 1.5rem; letter-spacing: -.02em; margin-top: 40px; margin-bottom: 15px; }
.privacy-content p { font-size: 1rem; color: var(--muted); }
.privacy-content a { color: var(--blue); text-decoration: underline; text-underline-offset: 4px; overflow-wrap: anywhere; }
.privacy-content .eyebrow { font-size: .75rem; }
html[lang="zh-CN"] h1, html[lang="zh-CN"] h2, html[lang="zh-CN"] h3 { letter-spacing: -.025em; line-height: 1.25; }
html[lang="zh-CN"] .service-card h3 { min-height: 0; }
html[lang="zh-CN"] .eyebrow { letter-spacing: 1px; }
@media (min-width: 1600px) { h1 { font-size: 5rem; } }
@media (max-width: 1100px) {
  .hero { gap: 32px; }
  .hero-actions { gap: 18px; }
  .desktop-nav { gap: 18px; }
  .header-actions { gap: 12px; }
  .workflow-board { padding: 20px 15px 14px; }
  .board-step { gap: 10px; padding: 17px 12px; }
  .board-step h2 { font-size: 1rem; }
  .service-card { padding: 25px 21px; }
  .service-card h3 { font-size: 1.5rem; }
  .workflow-panel { gap: 38px; }
  .faq { gap: 55px; }
  .contact-bottom { gap: 30px; }
}
@media (max-width: 900px) {
  .desktop-nav { gap: 15px; font-size: .875rem; }
  .site-header { gap: 20px; }
  .header-contact { padding: 12px; }
  .header-contact>span[aria-hidden] { display: none; }
  .service-grid { grid-template-columns: 1fr; }
  .service-card+.service-card { border-left: 0; border-top: 1px solid var(--line); }
  .service-card { padding: 30px; }
  .service-top { margin-bottom: 24px; }
  .service-card h3 { min-height: 0; max-width: none; font-size: 1.75rem; }
  .service-card ul { margin-top: 0; }
  .contact-bottom { display: block; }
  .contact-email { width: fit-content; margin-top: 25px; font-size: 1.5rem; }
}
@media (max-width: 760px) {
  .section-space { padding-top: 65px; padding-bottom: 65px; }
  .site-header { min-height: 95px; padding-top: 22px; padding-bottom: 22px; gap: 16px; }
  .desktop-nav, .header-contact { display: none; }
  .header-actions { margin-left: auto; gap: 16px; }
  .menu-button { display: flex; align-items: center; gap: 10px; font-size: .875rem; min-height: 44px; border: 0; background: transparent; color: var(--ink); padding: 0; }
  .menu-button>span[aria-hidden] { font-size: 1.25rem; }
  .menu-button[aria-expanded="true"]>span[aria-hidden] { transform: rotate(45deg); }
  .mobile-nav { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; padding: 15px 24px 22px; border-bottom: 1px solid var(--line); background: var(--soft); }
  .mobile-nav a { padding: 14px 0; font-size: .875rem; }
  .hero { grid-template-columns: 1fr; padding-top: 39px; padding-bottom: 47px; gap: 45px; }
  h1 { font-size: clamp(2.7rem, 9vw, 4.1875rem); letter-spacing: -.055em; }
  .hero-description { font-size: 1.125rem; }
  .workflow-board { transform: none; max-width: 520px; width: 100%; padding: 25px; margin: 0 auto; }
  .board-step h2 { font-size: 1.1875rem; }
  .board-step { padding: 20px 16px; }
  .board-review strong { font-size: 1rem; }
  .audience-strip { flex-wrap: wrap; justify-content: flex-start; gap: 16px 25px; }
  .audience-strip>span { width: 100%; }
  .audience-strip p { font-size: .875rem; }
  .eyebrow { letter-spacing: 1px; }
  .hero-actions>.button { font-size: .875rem; }
  .wordmark { font-size: 1.8125rem; }
  .intro { padding-top: 65px; padding-bottom: 65px; text-align: left; }
  .intro .eyebrow { justify-content: flex-start; }
  .intro>p:last-child { margin-left: 0; font-size: 1rem; }
  .section-heading { grid-template-columns: 1fr; gap: 25px; margin-bottom: 35px; }
  .section-heading>p { max-width: 500px; font-size: 1rem; }
  .workflow-panel { grid-template-columns: 1fr; gap: 30px; min-height: 0; }
  .example-context p { max-width: 500px; margin-bottom: 20px; }
  .example-number { margin-bottom: 20px; }
  .workflow-tabs { gap: 8px; padding-bottom: 23px; }
  .workflow-tabs button { padding: 11px 14px; }
  .approach-grid { grid-template-columns: 1fr; gap: 35px; }
  .approach-number { margin-bottom: 20px; }
  .about { grid-template-columns: 1fr; gap: 20px; padding-top: 48px; padding-bottom: 48px; }
  .about>.eyebrow { margin-bottom: 0; }
  .faq { grid-template-columns: 1fr; gap: 35px; }
  .faq-list summary { font-size: 1rem; }
  .contact-bottom { margin-top: 36px; padding-top: 28px; }
  .contact-email { font-size: clamp(.9375rem, 4.1vw, 1.5rem); gap: 12px; max-width: 100%; }
  .site-footer { flex-wrap: wrap; justify-content: flex-start; gap: 24px; padding-top: 30px; padding-bottom: 25px; }
  .site-footer>.wordmark { width: 100%; }
  .site-footer p { margin-right: auto; }
  .site-footer>.back-top { width: 100%; }
  .privacy-content { padding-top: 45px; padding-bottom: 50px; }
}
@media (max-width: 360px) {
  .section-shell, .site-header { padding-left: 20px; padding-right: 20px; }
  .header-actions { gap: 7px; }
  .workflow-board { padding: 18px 12px; }
  .document-symbol { display: none; }
  .board-step { gap: 9px; padding: 17px 12px; }
  .board-step h2 { font-size: 1.0625rem; }
  .board-top { font-size: .75rem; letter-spacing: 0; gap: 7px; }
  .service-card { padding: 25px 21px; }
  .workflow-tabs { gap: 6px; }
  .workflow-tabs button { padding: 11px; }
  .sample-output { padding: 20px 15px; }
  .sample-output dl { grid-template-columns: 70px 1fr; gap: 13px 10px; }
}
@media (prefers-reduced-motion: reduce) {
  :root { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
}