:root {
  --surface:#FFFFFF; --canvas:#F7F8FA; --text:#15171A; --muted:#626873;
  --accent:#344C8A; --accent-hover:#293E75; --selected:#EDF1F8;
  --divider:#D7DBE0; --control-border:#858585; --success:#206843;
  --warning:#825B1E; --error:#B42318;
  --font:Inter,"Segoe UI","PingFang SC","Microsoft YaHei",Arial,sans-serif;
  --radius:12px;
}
* { box-sizing:border-box; }
html { scroll-behavior:smooth; }
body { margin:0; color:var(--text); background:var(--surface); font-family:var(--font); font-size:17px; line-height:1.65; }
button,input,textarea,select { font:inherit; }
button,a,input,textarea,select,summary { -webkit-tap-highlight-color:transparent; }
a { color:var(--accent); text-decoration:underline; text-underline-offset:4px; }
a:hover { color:var(--accent-hover); }
button { cursor:pointer; }
:focus-visible { outline:3px solid var(--accent); outline-offset:4px; box-shadow:0 0 0 2px var(--surface); }
[hidden] { display:none!important; }
h1,h2,h3,p,figure { margin:0; }
h1,h2,h3 { font-weight:650; line-height:1.16; letter-spacing:-.025em; overflow-wrap:anywhere; }
h1 { font-size:clamp(40px,5vw,68px); max-width:1000px; }
h1 span { display:block; margin-top:8px; }
h2 { font-size:clamp(30px,3.3vw,44px); }
h3 { font-size:21px; }
p { overflow-wrap:anywhere; }
p+p { margin-top:16px; }
.container { width:min(1200px,calc(100% - 64px)); margin-inline:auto; }
.skip-link { position:absolute; top:8px; left:16px; transform:translateY(-160%); background:var(--surface); border:2px solid var(--accent); padding:10px 16px; z-index:10; }
.skip-link:focus { transform:translateY(0); }
.site-header { border-bottom:1px solid var(--divider); background:var(--surface); }
.site-header__inner { display:flex; align-items:center; gap:32px; min-height:96px; }
.brand { display:flex; flex-direction:column; color:var(--text); text-decoration:none; line-height:1.3; }
.brand__name { font-size:25px; font-weight:700; letter-spacing:-.04em; }
.brand__english { font-size:12px; letter-spacing:.04em; }
.main-nav { display:flex; gap:8px; flex:1; justify-content:center; }
.main-nav a,.language-nav a { color:var(--muted); text-decoration:none; font-size:14px; padding:10px 12px; white-space:nowrap; }
.main-nav a[aria-current],.language-nav a[aria-current] { background:var(--selected); color:var(--accent); font-weight:650; border-bottom:2px solid var(--accent); }
.main-nav a:hover,.language-nav a:hover { color:var(--accent); }
.language-nav { display:flex; gap:2px; }
.language-nav a { padding-inline:7px; font-size:12px; }
.hero { padding:48px 0 88px; }
.hero__grid { display:grid; grid-template-columns:1.1fr .9fr; align-items:center; gap:72px; min-height:450px; }
.eyebrow,.section-index { color:var(--accent); font-size:12px; font-weight:650; letter-spacing:.12em; margin-bottom:24px; }
.hero__lead { font-size:19px; color:var(--muted); max-width:560px; margin-top:32px; }
.hero__signature { font-size:12px; color:var(--muted); margin-top:40px; }
.button-row { display:flex; flex-wrap:wrap; gap:12px; margin-top:32px; }
.button { display:inline-flex; align-items:center; justify-content:center; gap:24px; border:1px solid transparent; border-radius:7px; padding:12px 20px; min-height:48px; font-size:15px; font-weight:600; text-decoration:none; line-height:1.4; }
.button--primary { background:var(--accent); color:var(--surface); }
.button--primary:hover { background:var(--accent-hover); color:var(--surface); }
.button--secondary { background:var(--surface); color:var(--accent); border-color:var(--control-border); }
.button--secondary:hover { background:var(--selected); }
.button--light { background:var(--surface); color:var(--text); }
.button--light:hover { background:var(--selected); }
.button:disabled { opacity:.6; cursor:default; }
.section-pad { padding:88px 0; }
.section-tint,.sample-section,.invitation { background:var(--canvas); }
.section-heading { max-width:760px; margin-bottom:40px; }
.section-heading p:not(.section-index):not(.eyebrow) { margin-top:20px; color:var(--muted); }
.split { display:grid; grid-template-columns:1fr 1fr; gap:64px; align-items:start; }
.split h2+p,.split h3+p { margin-top:24px; }
.split>div>.button { margin-top:32px; }
.section-copy { color:var(--muted); margin-top:24px; }
.sample-viewer { border:1px solid var(--divider); border-radius:var(--radius); background:var(--surface); padding:28px 32px 32px; }
.sample-tabs { display:flex; gap:8px; flex-wrap:wrap; padding-bottom:24px; border-bottom:1px solid var(--divider); }
.sample-tabs button { color:var(--muted); background:var(--surface); border:1px solid var(--control-border); border-radius:7px; padding:10px 16px; font-size:14px; }
.sample-tabs button[aria-selected="true"] { color:var(--accent); background:var(--selected); border:2px solid var(--accent); padding:9px 15px; font-weight:650; }
.sample-panel { padding-top:32px; }
.sample-columns { display:grid; grid-template-columns:1fr 1fr 1fr; gap:32px; }
.sample-columns h3 { font-size:15px; margin-bottom:16px; }
.sample-columns p { color:var(--muted); font-size:15px; }
.research-section { background:var(--text); color:var(--surface); }
.research-section .eyebrow,.research-section .section-copy,.research-section figcaption,.research-section .figure-heading span { color:#D7DBE0; }
.research-section .source-card p:not(.eyebrow) { color:#D7DBE0; }
.research-section .figure-heading strong { color:#FFFFFF; }
.research-section a:not(.button) { color:#FFFFFF; }
.research-section :focus-visible { outline-color:#FFFFFF; box-shadow:0 0 0 2px #15171A; }
.research-section .architecture-figure,.research-section .source-card { background:transparent; border-color:#626873; }
.research-section .overview-core,.research-section .overview-labels span { border-color:#858585; background:#15171A; color:#FFFFFF; }
.research-source { margin-top:48px; }
.research-source .source-card { display:grid; grid-template-columns:1fr 2fr; column-gap:32px; align-items:start; }
.research-source .source-card .eyebrow { grid-column:1; }
.research-source .source-card h3 { grid-column:1; }
.research-source .source-card p:not(.eyebrow):not(.source-date) { grid-column:2; grid-row:1 / span 3; margin-top:0; color:#D7DBE0; }
.research-source .source-card a { grid-column:2; }
.architecture-figure { padding:32px; border:1px solid var(--divider); border-radius:var(--radius); background:var(--surface); }
.figure-heading { display:flex; gap:16px; justify-content:space-between; align-items:start; font-size:13px; color:var(--muted); }
.figure-heading strong { font-size:17px; color:inherit; }
.overview-map { display:flex; flex-direction:column; align-items:center; gap:24px; margin-block:40px; }
.overview-core { border:1px solid var(--accent); border-radius:50%; padding:30px 20px; color:var(--accent); }
.overview-labels { display:flex; flex-wrap:wrap; justify-content:center; gap:12px; }
.overview-labels span { border:1px solid var(--divider); background:var(--canvas); border-radius:6px; padding:8px 18px; font-size:13px; }
figcaption { font-size:12px; color:var(--muted); }
.architecture { display:grid; gap:16px; margin-block:32px; text-align:center; }
.belief,.feedback>div { padding:16px; background:var(--selected); border:1px solid var(--divider); border-radius:6px; }
.architecture small,.architecture strong { display:block; }
.architecture small { font-size:12px; color:var(--muted); }
.processes { display:grid; grid-template-columns:1fr 1fr; gap:8px; font-size:13px; }
.processes span { padding:8px; border:1px solid var(--divider); }
.feedback { display:grid; gap:8px; font-size:13px; }
.architecture-details { margin-top:48px; border-top:1px solid var(--divider); }
summary { cursor:pointer; padding:20px 0; color:var(--accent); font-weight:600; }
.source-card { padding:32px; border:1px solid var(--divider); border-radius:var(--radius); }
.source-card .eyebrow { margin-bottom:16px; }
.source-card p:not(.eyebrow) { margin-top:16px; color:var(--muted); font-size:14px; }
.source-card .source-date { font-size:12px; }
.source-card a { display:inline-block; margin-top:24px; font-size:14px; }
.invitation { padding:80px 0; border-top:1px solid var(--divider); }
.invitation-grid { display:grid; grid-template-columns:1fr 1fr; gap:32px; }
.invitation-grid article { padding:32px; background:var(--surface); border:1px solid var(--divider); border-radius:var(--radius); display:flex; flex-direction:column; align-items:flex-start; }
.invitation-grid p,.invitation-grid ul { margin-top:16px; margin-bottom:24px; color:var(--muted); }
.invitation-grid ul { padding-left:22px; }
.invitation-grid .button { margin-top:auto; }
.page-hero { padding:48px 0 72px; }
.page-lead { font-size:20px; margin-top:32px; color:var(--muted); max-width:800px; }
.product-intro { max-width:900px; }
.module-grid { display:grid; grid-template-columns:repeat(4,1fr); gap:16px; }
.module-grid article { display:flex; flex-direction:column; align-items:flex-start; padding:24px; border:1px solid var(--divider); border-radius:var(--radius); background:var(--surface); }
.item-number { color:var(--accent); font-size:12px; margin-bottom:24px; }
.module-grid h3 { font-size:20px; }
.module-grid p { font-size:14px; color:var(--muted); margin-top:16px; }
.module-grid .access-status { margin-top:auto; padding-top:24px; }
.module-grid a { margin-top:12px; font-size:14px; }
.access-status { color:var(--muted); font-size:12px; }
.directory-heading { margin-top:64px; }
.capability-directory { border-top:1px solid var(--divider); }
.capability-directory article { display:grid; grid-template-columns:56px 1fr 140px; gap:24px; padding:24px 8px; border-bottom:1px solid var(--divider); align-items:start; }
.capability-id { font-size:13px; color:var(--accent); font-weight:650; }
.capability-directory h3 { font-size:18px; }
.capability-directory p { margin-top:8px; font-size:14px; color:var(--muted); }
.directory-action { display:flex; flex-direction:column; gap:8px; font-size:14px; }
.discussion-grid { display:grid; gap:24px; }
.discussion-grid article { padding-top:24px; border-top:1px solid var(--divider); }
.discussion-grid p { font-size:15px; color:var(--muted); margin-top:12px; }
.direction-list { display:grid; gap:24px; }
.direction-list a { display:block; border:1px solid var(--divider); border-radius:var(--radius); padding:32px; background:var(--surface); text-decoration:none; }
.direction-list a>span { font-size:12px; }
.direction-list h3 { margin-top:16px; }
.direction-list p { margin-top:12px; font-size:14px; color:var(--muted); }
.contact-section { background:var(--canvas); padding:64px 0 88px; }
.contact-layout { display:grid; grid-template-columns:.8fr 1.4fr; gap:64px; }
.contact-aside { min-width:0; }
.contact-aside>p { margin-block:24px; color:var(--muted); }
.email-link { display:block; font-size:16px; margin-top:20px; overflow-wrap:anywhere; }
.contact-aside__note { border-top:1px solid var(--divider); margin-top:40px; padding-top:32px; }
.contact-aside__note p { margin-top:16px; color:var(--muted); font-size:14px; }
.contact-card { background:var(--surface); border:1px solid var(--divider); border-radius:var(--radius); padding:32px; min-width:0; }
.form-heading p { color:var(--muted); font-size:14px; margin-top:16px; }
.form-heading h2 { font-size:27px; }
.form-grid { display:grid; grid-template-columns:1fr 1fr; gap:24px; margin-top:32px; }
.form-field--full { grid-column:1/-1; }
.form-field label,legend { display:block; margin-bottom:8px; font-size:14px; font-weight:600; }
.form-field label span,legend span { color:var(--muted); font-weight:400; font-size:12px; margin-left:8px; }
input:not([type="radio"]),textarea { display:block; width:100%; min-width:0; border:1px solid var(--control-border); border-radius:6px; padding:10px 12px; background:var(--surface); color:var(--text); font-size:15px; }
textarea { resize:vertical; }
input::placeholder,textarea::placeholder { color:var(--muted); }
.intent-group { border:0; padding:0; margin:0; min-width:0; }
.intent-group>div { display:flex; flex-wrap:wrap; gap:12px; }
.intent-group label { display:flex; align-items:center; gap:8px; padding:10px 14px; border:1px solid var(--control-border); border-radius:6px; font-size:14px; }
.intent-group label:has(:checked) { background:var(--selected); border-color:var(--accent); }
input[type="radio"] { accent-color:var(--accent); }
.field-help,.form-notice { color:var(--muted); font-size:12px; margin-top:8px; }
.form-notice { margin-block:24px; }
.form-status { color:var(--success); font-size:14px; margin-top:16px; }
.mail-actions { display:flex; flex-wrap:wrap; gap:12px; margin-top:24px; }
.mail-actions p { flex-basis:100%; color:var(--muted); font-size:13px; }
.privacy-note { margin-top:32px; border-top:1px solid var(--divider); font-size:13px; }
.privacy-note p { color:var(--muted); }
.site-footer { border-top:1px solid var(--divider); background:var(--surface); padding-top:48px; }
.footer-top { display:grid; grid-template-columns:1fr 1fr 1fr; gap:32px; padding-bottom:40px; }
.footer-top p { font-size:14px; color:var(--muted); }
.footer-top nav { display:flex; flex-direction:column; gap:12px; align-items:flex-start; font-size:14px; }
.footer-bottom { border-top:1px solid var(--divider); display:flex; flex-wrap:wrap; justify-content:space-between; gap:16px; padding-block:24px; font-size:11px; color:var(--muted); }
@media (max-width:1100px) {
  .site-header__inner { gap:16px; flex-wrap:wrap; padding-block:16px; }
  .main-nav { order:3; width:100%; flex-basis:100%; justify-content:flex-start; }
  .language-nav { margin-left:auto; }
  .hero__grid { gap:32px; }
  .module-grid { grid-template-columns:1fr 1fr; }
  .contact-layout { gap:32px; }
}
@media (max-width:720px) {
  body { font-size:16px; }
  .container { width:calc(100% - 40px); }
  .brand__name { font-size:21px; }
  .brand__english { font-size:10px; }
  .language-nav { gap:0; }
  .language-nav a { font-size:11px; padding:8px 5px; }
  .main-nav { flex-wrap:wrap; gap:4px; }
  .main-nav a { font-size:13px; padding:8px 9px; }
  .hero { padding:32px 0 56px; }
  .hero__grid,.split,.invitation-grid,.contact-layout { grid-template-columns:1fr; gap:32px; }
  .hero__lead,.page-lead { font-size:17px; margin-top:24px; }
  .section-pad,.invitation { padding:56px 0; }
  .sample-viewer,.architecture-figure,.source-card,.contact-card,.invitation-grid article { padding:24px; }
  .sample-columns { grid-template-columns:1fr; gap:24px; }
  .sample-columns>div+div { border-top:1px solid var(--divider); padding-top:24px; }
  .sample-tabs { gap:8px; }
  .sample-tabs button { font-size:13px; padding:8px 12px; }
  .sample-tabs button[aria-selected="true"] { padding:7px 11px; }
  .research-source .source-card { display:block; }
  .research-source .source-card p:not(.eyebrow):not(.source-date) { margin-top:16px; }
  .page-hero { padding:32px 0 48px; }
  .module-grid { grid-template-columns:1fr; }
  .capability-directory article { grid-template-columns:40px 1fr; gap:16px; }
  .directory-action { grid-column:2; flex-direction:row; flex-wrap:wrap; justify-content:space-between; }
  .contact-section { padding:40px 0 56px; }
  .form-grid { grid-template-columns:1fr; }
  .footer-top { grid-template-columns:1fr; }
}
@media (max-width:360px) {
  .container { width:calc(100% - 32px); }
  .site-header__inner { gap:12px; }
  .language-nav { margin-left:0; }
  .sample-viewer,.contact-card { padding:20px; }
}
@media (prefers-reduced-motion:reduce) { html { scroll-behavior:auto; } }
.product-independence { max-width:800px; color:var(--muted); font-size:15px; margin-top:24px; }
.module-contract { font-size:13px; margin:20px 0; padding-top:16px; border-top:1px solid var(--divider); }
.module-contract dt { font-weight:600; color:var(--text); margin-top:12px; }
.module-contract dd { margin:6px 0 0; color:var(--muted); }
.hero-brand { min-width:0; width:100%; max-width:490px; justify-self:center; }
.hero-brand svg { display:block; width:100%; height:auto; }
.art-caption { display:flex; justify-content:space-between; gap:12px; color:var(--muted); font-size:9px; letter-spacing:.08em; margin-inline:16px; }
.product-section { background:var(--canvas); }
.home-product-entry { display:flex; align-items:center; justify-content:flex-end; height:100%; padding-top:32px; }
@media(max-width:720px) { .home-product-entry { justify-content:flex-start; padding-top:0; } }