/* v1 的响应式、可访问性及直接联系修复。 */
:root { color-scheme: dark; --text-muted: #a0aec2; --primary-blue-light: #76aaff; }
html { scroll-padding-top: 96px; }
body { overflow-x: visible; }
button, a, summary { -webkit-tap-highlight-color: rgba(212, 168, 67, .22); touch-action: manipulation; }
button { font: inherit; }
[hidden] { display: none !important; }
:focus-visible { outline: 3px solid var(--accent-gold-light); outline-offset: 4px; }
[id] { scroll-margin-top: 96px; }
h1, h2, h3, h4 { text-wrap: pretty; word-break: normal; overflow-wrap: anywhere; }
p, li, a, .comparison-cell { overflow-wrap: anywhere; }
.container, .container-narrow { padding-inline: max(24px, env(safe-area-inset-left)) max(24px, env(safe-area-inset-right)); }
.skip-link { position: fixed; top: 12px; left: 16px; z-index: 1100; padding: 10px 20px; color: var(--bg-dark); background: var(--accent-gold-light); border-radius: 8px; transform: translateY(-160%); }
.skip-link:focus { transform: translateY(0); }
.visually-hidden { position: absolute; width: 1px; height: 1px; margin: -1px; padding: 0; overflow: hidden; clip-path: inset(50%); white-space: nowrap; border: 0; }
.logo { flex-shrink: 0; }
.logo img { flex-shrink: 0; }
.logo-text { min-width: 0; }
.nav-links a { display: inline-flex; align-items: center; min-height: 44px; white-space: nowrap; }
.nav-links .nav-cta:hover { background: var(--accent-gold-light); }
.nav-toggle { display: none; align-items: center; gap: 10px; min-height: 44px; padding: 8px 14px; border: 1px solid var(--border-gold); border-radius: 8px; background: var(--bg-navy); color: var(--text-white); cursor: pointer; }
.nav-toggle:hover { background: #183858; border-color: var(--accent-gold); }
.nav-toggle-icon { width: 18px; height: 14px; display: inline-flex; flex-direction: column; justify-content: space-between; }
.nav-toggle-icon span { display: block; width: 18px; height: 2px; background: currentColor; }
.nav-links [aria-current="page"] { color: var(--text-white); background-color: var(--bg-card-hover); }
.breadcrumb-nav { flex-wrap: wrap; }
.breadcrumb-nav a { display: inline-flex; min-height: 44px; align-items: center; }
.breadcrumb { padding-bottom: 12px; }
.hero-stats { font-variant-numeric: tabular-nums; }
.business-card, .pricing-card, .advantage-item, .arch-layer-content, .mapping-engine, .comparison-cell, .lead-form-info, .horizontal-note-text { min-width: 0; }
.business-features li { align-items: flex-start; }
.business-features i { margin-top: .5em; flex-shrink: 0; }
.business-link { min-height: 44px; }
.footer-col a { display: inline-block; padding-block: 8px; }
.footer-col ul { gap: 2px; }
.footer-bottom a:not(.brand-link) { text-decoration: underline; text-underline-offset: 4px; }
.content-card > h2 { display: flex; align-items: flex-start; gap: 12px; font-size: 1.3rem; color: var(--text-white); margin-bottom: 16px; line-height: 1.5; }
.content-card > h2 i { color: var(--accent-gold); margin-top: .25em; }
.content-card ul li { display: block; position: relative; padding-left: 20px; }
.content-card ul li > i:first-child { position: absolute; left: 0; top: .35em; }
.content-card ul li strong { margin-right: .25em; }
.content-card p:last-child { margin-bottom: 0; }
.faq-list { max-width: 100%; }
details.faq-item { margin-block: 12px; }
details.faq-item summary { display: flex; align-items: flex-start; justify-content: space-between; gap: 20px; list-style: none; min-height: 56px; padding: 20px 24px; color: var(--text-white); cursor: pointer; font-weight: 600; line-height: 1.6; }
details.faq-item summary::-webkit-details-marker { display: none; }
details.faq-item summary::after { content: '+'; color: var(--accent-gold-light); font-size: 1.25rem; line-height: 1.2; flex-shrink: 0; }
details.faq-item[open] summary::after { content: '−'; }
details.faq-item summary:hover { background: var(--bg-card-hover); }
details.faq-item summary:focus-visible { outline-offset: -4px; }
details.faq-item > p { padding: 0 24px 24px; margin: 0; }
.rag-monitor-text { min-width: 0; flex: 1 1 240px; }
.mapping-engines { grid-template-columns: repeat(auto-fit, minmax(min(100%, 280px), 1fr)); }
.lead-form-grid { align-items: start; grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr); gap: 48px; }
.direct-contact-card { min-width: 0; padding: 32px; border: 1px solid var(--border-gold); background: rgba(15, 40, 71, .8); border-radius: var(--radius-lg); }
.direct-contact-card h3 { font-size: 1.35rem; color: var(--text-white); margin-bottom: 10px; }
.direct-contact-card > p { color: var(--text-secondary); margin-bottom: 20px; }
.direct-contact-list { display: grid; gap: 20px; }
.direct-contact-item { padding-top: 20px; border-top: 1px solid var(--border-light); }
.direct-contact-item dt { color: var(--text-secondary); font-size: .88rem; margin-bottom: 6px; }
.direct-contact-item dd { margin: 0; }
.contact-value { display: block; width: fit-content; max-width: 100%; font-size: 1.2rem; font-weight: 600; color: var(--accent-gold-light); line-height: 1.7; padding-block: 5px; font-variant-numeric: tabular-nums; user-select: text; }
a.contact-value:hover { text-decoration: underline; text-underline-offset: 4px; color: #fff; }
.contact-hint { display: block; color: var(--text-secondary); font-size: .85rem; margin-top: 4px; }
.copy-wechat { display: inline-flex; align-items: center; justify-content: center; min-height: 44px; padding: 8px 18px; margin-top: 8px; background: var(--accent-gold); border: 1px solid var(--accent-gold); border-radius: 8px; color: var(--bg-dark); cursor: pointer; font-weight: 600; }
.copy-wechat:hover { background: var(--accent-gold-light); border-color: var(--accent-gold-light); }
.copy-wechat:disabled { cursor: wait; opacity: .75; }
.copy-status { min-height: 1.6em; margin-top: 12px; font-size: .85rem; color: var(--accent-gold-light); }
.business-card .contact-value { margin-block: 10px; }
.comparison-cell { min-width: 0; }
.arch-layer-label { text-shadow: 0 1px 3px rgba(0, 0, 0, .7); }
.arch-layer.adapt .arch-layer-label { background: #6233af; }
.arch-layer.data .arch-layer-label { background: #087151; }
.arch-layer.infra .arch-layer-label { background: #8e4c0b; }
@media (max-width: 1100px) {
  .nav-inner { flex-wrap: wrap; height: auto; min-height: 72px; padding-block: 12px; gap: 16px; }
  .nav-links { display: flex; flex-wrap: wrap; width: 100%; gap: 4px; }
  .nav-enhanced .nav-inner { flex-wrap: nowrap; height: 72px; }
  .nav-enhanced .nav-toggle { display: inline-flex; margin-left: auto; flex-shrink: 0; }
  .nav-enhanced .nav-links { position: absolute; left: 0; right: 0; top: 100%; display: none; flex-direction: column; align-items: stretch; gap: 4px; padding: 16px max(24px, env(safe-area-inset-right)) 24px max(24px, env(safe-area-inset-left)); background: var(--bg-dark); border-bottom: 1px solid var(--border-gold); box-shadow: 0 20px 36px rgba(0, 0, 0, .35); max-height: calc(100dvh - 72px); overflow-y: auto; overscroll-behavior: contain; }
  .nav-enhanced .nav-links.is-open { display: flex; }
  .nav-links a { display: flex; width: 100%; padding: 12px 16px; }
  .nav-links .nav-cta { justify-content: center; margin-top: 8px; }
  .navbar:not(.nav-enhanced) { position: static; }
  .site-header:has(.navbar:not(.nav-enhanced)) + .breadcrumb { padding-top: 24px; }
  .hero { padding-top: 124px; }
}
@media (max-width: 768px) {
  .lead-form-grid { grid-template-columns: minmax(0, 1fr); gap: 32px; }
  .lead-form-info { text-align: left; }
  .hero-buttons .btn { justify-content: center; }
  .section-header { margin-bottom: 36px; }
  .section-title { font-size: clamp(1.55rem, 5.2vw, 2rem); line-height: 1.5; }
  .page-header h1 { font-size: clamp(1.9rem, 6.5vw, 2.5rem); line-height: 1.4; }
  .tech-arch { padding: 24px; }
  .arch-layer-content { padding: 16px; }
  .content-card { padding: 24px; }
  .mapping-stage { padding: 24px; }
  .mapping-stage-header { align-items: flex-start; gap: 14px; }
  .mapping-stage-header h3 { font-size: 1.1rem; }
  .horizontal-note { align-items: flex-start; padding: 24px; gap: 16px; }
  .methodology-flow { gap: 24px; }
  .methodology-stage { min-width: 0; flex-basis: 100%; max-width: 100%; }
  .methodology-arrow { display: none; }
  .comparison-cell { padding: 12px 10px; font-size: .85rem; }
  .comparison-header .comparison-cell { font-size: .88rem; }
  .comparison-cell:first-child { flex: .65; }
  .direct-contact-card { padding: 24px; }
  .rag-monitor-bar { padding: 24px; }
  .footer { margin-top: 32px; }
}
@media (max-width: 420px) {
  .container, .container-narrow { padding-inline: max(20px, env(safe-area-inset-left)) max(20px, env(safe-area-inset-right)); }
  .nav-inner { gap: 8px; }
  .logo { gap: 8px; }
  .logo img { width: 36px; height: 36px; }
  .logo-title { font-size: 1.05rem; }
  .logo-sub { font-size: .56rem; letter-spacing: 1.5px; }
  .nav-toggle { padding-inline: 10px; gap: 7px; }
  .hero h1 { font-size: 1.8rem; line-height: 1.45; }
  .hero-badge { padding-inline: 12px; font-size: .78rem; }
  .hero-buttons { gap: 12px; }
  .hero-buttons .btn { width: 100%; padding-inline: 16px; }
  .business-card, .pricing-card, .advantage-item, .content-card, .mapping-stage { padding: 24px 20px; }
  .advantage-item { gap: 14px; }
  .mapping-stage-header { flex-wrap: wrap; }
  .horizontal-note { flex-direction: column; padding: 20px; }
  .direct-contact-card { padding: 24px 20px; }
  .contact-value { font-size: 1.05rem; }
  details.faq-item summary { padding: 16px; gap: 12px; }
  details.faq-item > p { padding: 0 16px 20px; }
  .footer-bottom { align-items: flex-start; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; scroll-behavior: auto !important; }
  .business-card:hover, .engine-item:hover, .mapping-engine:hover, .methodology-stage:hover, .btn:hover, .nav-cta:hover { transform: none; }
}

.site-filing-record { margin: 12px auto 0; padding: 0 20px; text-align: center; font-size: 12px; line-height: 1.8; color: var(--text-muted); }
.site-filing-record a { color: inherit; text-decoration: underline; text-underline-offset: 3px; }