:root {
  color-scheme: light;
  --canvas: #f5f5f7;
  --surface: #ffffff;
  --surface-subtle: #eef5ff;
  --ink: #1d1d1f;
  --muted: #515154;
  --line: #d2d2d7;
  --accent: #0066cc;
  --accent-strong: #0055aa;
  --accent-soft: #e6f0ff;
  --blue: #0066cc;
  --blue-soft: #e6f0ff;
  --success: #147a4d;
  --danger: #b42318;
  --shadow: 0 18px 42px rgba(22, 33, 38, 0.08);
}

:root[data-theme='dark'] {
  color-scheme: dark;
  --canvas: #161617;
  --surface: #202022;
  --surface-subtle: #162844;
  --ink: #f5f5f7;
  --muted: #a8b8cc;
  --line: #263a55;
  --accent: #4d9bff;
  --accent-strong: #80b7ff;
  --accent-soft: #153762;
  --blue: #4d9bff;
  --blue-soft: #203b63;
  --success: #68d29a;
  --danger: #ff9b93;
  --shadow: 0 18px 42px rgba(0, 0, 0, 0.22);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  min-width: 320px;
  margin: 0;
  background: var(--canvas);
  color: var(--ink);
  font: 15px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans SC", sans-serif;
  letter-spacing: 0;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; }
button, input, select, textarea { font: inherit; }
button { cursor: pointer; }
.skip-link { position: absolute; left: 1rem; top: -5rem; z-index: 100; background: var(--ink); color: var(--surface); padding: .5rem .75rem; }
.skip-link:focus { top: 1rem; }

.site-header { border-bottom: 1px solid var(--line); background: color-mix(in srgb, var(--canvas) 92%, transparent); backdrop-filter: blur(18px); }
.header-inner { max-width: 1180px; min-height: 68px; margin: 0 auto; padding: 0 24px; display: flex; align-items: center; gap: 24px; }
.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--ink); font-weight: 760; font-size: 17px; text-decoration: none; letter-spacing: 0; }
.brand-mark { width: 30px; height: 30px; display: grid; place-items: center; background: var(--accent); color: #fff; border-radius: 9px; font-size: 11px; font-weight: 800; letter-spacing: 0; }
.site-nav { display: flex; align-items: center; gap: 2px; margin-left: auto; }
.site-nav a { padding: 8px 10px; color: var(--muted); border-bottom: 2px solid transparent; text-decoration: none; font-size: 14px; font-weight: 620; }
.site-nav a:hover, .site-nav a[aria-current='page'] { color: var(--ink); border-bottom-color: var(--accent); }
.header-actions { display: flex; align-items: center; gap: 8px; }
.icon-button { width: 34px; height: 34px; display: inline-grid; place-items: center; border: 1px solid var(--line); border-radius: 7px; background: var(--surface); color: var(--ink); }
.menu-button { display: none; }
.button { min-height: 40px; display: inline-flex; align-items: center; justify-content: center; gap: 8px; padding: 8px 15px; border: 1px solid transparent; border-radius: 7px; background: var(--accent); color: #fff; text-decoration: none; font-size: 14px; font-weight: 700; transition: background .16s ease, border-color .16s ease, transform .16s ease; }
.button:hover { background: var(--accent-strong); transform: translateY(-1px); }
.button-secondary { border-color: var(--line); background: var(--surface); color: var(--ink); }
.button-secondary:hover { background: var(--surface-subtle); }
.button-small { min-height: 34px; padding: 6px 11px; font-size: 13px; }
.button:focus-visible, .icon-button:focus-visible, a:focus-visible, input:focus-visible, textarea:focus-visible, select:focus-visible { outline: 3px solid color-mix(in srgb, var(--accent) 32%, transparent); outline-offset: 2px; }

main { overflow: hidden; }
.container { width: min(1180px, calc(100% - 48px)); margin: 0 auto; }
.eyebrow { margin: 0 0 12px; color: var(--accent); font-size: 12px; font-weight: 800; letter-spacing: 0; text-transform: uppercase; }
.section { padding: 82px 0; border-top: 1px solid var(--line); }
.section-heading { display: grid; grid-template-columns: minmax(0, 1fr) minmax(260px, 390px); gap: 32px; align-items: end; margin-bottom: 36px; }
h1, h2, h3, p { margin-top: 0; }
h1 { max-width: 720px; margin-bottom: 20px; font-size: 56px; line-height: 1.05; letter-spacing: 0; }
h2 { margin-bottom: 0; font-size: 36px; line-height: 1.15; letter-spacing: 0; }
h3 { font-size: 18px; line-height: 1.35; }
.lede { max-width: 640px; color: var(--muted); font-size: 18px; line-height: 1.7; }
.section-copy { margin: 0; color: var(--muted); font-size: 16px; }

.hero { padding: 76px 0 70px; }
.hero-grid { display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(400px, .95fr); gap: 50px; align-items: center; }
.availability { display: inline-flex; align-items: center; gap: 8px; margin-bottom: 21px; padding: 5px 9px; border: 1px solid var(--line); border-radius: 6px; background: var(--surface); color: var(--muted); font-size: 13px; font-weight: 650; }
.availability::before { width: 7px; height: 7px; border-radius: 50%; background: var(--success); content: ""; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 30px; }
.hero-note { display: flex; align-items: center; gap: 14px; margin-top: 34px; color: var(--muted); font-size: 13px; }
.hero-note strong { color: var(--ink); font-size: 15px; }
.terminal { overflow: hidden; border: 1px solid var(--line); border-radius: 8px; background: var(--surface); box-shadow: var(--shadow); }
.terminal-bar { display: flex; align-items: center; gap: 7px; padding: 13px 15px; border-bottom: 1px solid var(--line); color: var(--muted); font: 12px/1.2 ui-monospace, SFMono-Regular, Menlo, monospace; }
.terminal-dot { width: 9px; height: 9px; border-radius: 50%; background: #d4b54d; }
.terminal-dot:nth-child(2) { background: #d8785d; }.terminal-dot:nth-child(3) { background: #5aa87c; }
.terminal-label { margin-left: 6px; }
.terminal-main { padding: 22px; background: #1d1d1f; color: #e8f2ff; font: 13px/1.75 ui-monospace, SFMono-Regular, Menlo, monospace; }
.terminal-main .comment { color: #8da8c7; }.terminal-main .key { color: #80b7ff; }.terminal-main .value { color: #b7d5ff; }.terminal-main .string { color: #b6e3ff; }
.request-status { display: grid; grid-template-columns: 1fr 1fr; gap: 1px; border-top: 1px solid #33474d; background: #33474d; }
.request-status div { padding: 13px 16px; background: #142126; color: #c4d4d5; font-size: 13px; }.request-status strong { display: block; color: #fff; }

.metrics { border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); background: var(--surface); }
.metric-grid { display: grid; grid-template-columns: repeat(4, 1fr); }.metric { min-height: 130px; padding: 24px; border-right: 1px solid var(--line); }.metric:last-child { border-right: 0; }.metric strong { display: block; margin-bottom: 5px; font-size: 30px; line-height: 1; letter-spacing: 0; }.metric span { color: var(--muted); font-size: 13px; }
.capability-grid { display: grid; grid-template-columns: repeat(3, 1fr); border: 1px solid var(--line); border-radius: 8px; overflow: hidden; background: var(--line); gap: 1px; }
.capability { min-height: 220px; padding: 26px; background: var(--surface); }.capability-index { display: block; margin-bottom: 34px; color: var(--accent); font: 700 12px/1 ui-monospace, monospace; }.capability p { margin-bottom: 0; color: var(--muted); font-size: 14px; }
.workflow { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }.workflow-step { position: relative; padding: 0 20px 0 0; }.workflow-step:not(:last-child)::after { position: absolute; top: 16px; right: 0; width: 34px; border-top: 1px solid var(--line); content: ""; }.step-number { width: 34px; height: 34px; display: grid; place-items: center; margin-bottom: 18px; border: 1px solid var(--line); border-radius: 7px; background: var(--surface); color: var(--accent); font: 800 13px/1 ui-monospace, monospace; }.workflow-step p { margin: 0; color: var(--muted); font-size: 14px; }
.integration { display: grid; grid-template-columns: minmax(0, .75fr) minmax(0, 1.25fr); border: 1px solid var(--line); border-radius: 8px; background: var(--surface); overflow: hidden; }.integration-copy { padding: 34px; border-right: 1px solid var(--line); }.integration-copy p { color: var(--muted); }.model-list { display: flex; flex-wrap: wrap; gap: 8px; padding: 34px; align-content: center; }.model-chip { padding: 7px 10px; border: 1px solid var(--line); border-radius: 5px; background: var(--surface-subtle); color: var(--ink); font-size: 13px; font-weight: 650; }
.cta-band { padding: 56px; border: 1px solid var(--line); border-radius: 8px; background: var(--surface); display: flex; align-items: end; justify-content: space-between; gap: 28px; }.cta-band p { max-width: 580px; margin: 12px 0 0; color: var(--muted); }

.page-hero { padding: 64px 0 40px; }.page-hero h1 { margin-bottom: 14px; font-size: 42px; }.breadcrumb { margin-bottom: 22px; color: var(--muted); font-size: 13px; }.breadcrumb a { text-decoration: none; }.breadcrumb a:hover { color: var(--accent); }
.query-layout { display: grid; grid-template-columns: minmax(0, 1fr) 290px; gap: 24px; align-items: start; }.query-card, .support-card, .plan-card, .form-card { border: 1px solid var(--line); border-radius: 8px; background: var(--surface); }.query-card { padding: 30px; }.query-title-row { display: flex; gap: 12px; align-items: start; margin-bottom: 24px; }.query-title-row p, .support-card p { margin: 4px 0 0; color: var(--muted); font-size: 14px; }.field-label { display: block; margin-bottom: 8px; color: var(--ink); font-size: 14px; font-weight: 700; }.query-row { display: flex; gap: 10px; }.text-input, .select-input, .text-area { width: 100%; min-height: 43px; padding: 10px 12px; border: 1px solid var(--line); border-radius: 6px; background: var(--canvas); color: var(--ink); }.text-input { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; }.text-area { min-height: 112px; resize: vertical; }.query-hint { margin: 12px 0 0; color: var(--muted); font-size: 13px; }.alert { display: none; margin-top: 15px; padding: 11px 13px; border: 1px solid color-mix(in srgb, var(--danger) 40%, var(--line)); border-radius: 6px; background: color-mix(in srgb, var(--danger) 8%, var(--surface)); color: var(--danger); font-size: 14px; }.alert.visible { display: block; }.support-card { padding: 22px; }.support-card + .support-card { margin-top: 14px; }.support-card h3 { margin-bottom: 10px; font-size: 16px; }.support-list { display: grid; gap: 12px; margin: 0; padding: 0; list-style: none; }.support-list li { color: var(--muted); font-size: 14px; }.support-list strong { display: block; color: var(--ink); }
.result-section { display: none; margin-top: 24px; }.result-section.visible { display: block; }.result-heading { display: flex; align-items: center; justify-content: space-between; gap: 16px; margin-bottom: 14px; }.result-heading h2 { font-size: 20px; }.status-badge { padding: 4px 8px; border: 1px solid color-mix(in srgb, var(--success) 40%, var(--line)); border-radius: 5px; color: var(--success); font-size: 13px; font-weight: 700; }.result-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }.result-metric { min-height: 122px; padding: 18px; border: 1px solid var(--line); border-radius: 7px; background: var(--surface); }.result-metric strong { display: block; margin-top: 18px; font-size: 26px; line-height: 1.1; word-break: break-word; }.result-metric span { color: var(--muted); font-size: 13px; }.result-meta { display: grid; grid-template-columns: 1fr 1fr; gap: 1px; margin-top: 12px; border: 1px solid var(--line); border-radius: 7px; overflow: hidden; background: var(--line); }.result-meta div { padding: 14px 16px; background: var(--surface); }.result-meta dt { color: var(--muted); font-size: 12px; }.result-meta dd { margin: 4px 0 0; font-weight: 700; }

.plans { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }.plan-card { padding: 28px; }.plan-card.featured { border-color: var(--accent); box-shadow: 0 0 0 1px var(--accent); }.plan-label { display: block; min-height: 20px; margin-bottom: 18px; color: var(--accent); font-size: 12px; font-weight: 800; letter-spacing: 0; text-transform: uppercase; }.plan-card p { color: var(--muted); }.plan-price { display: block; margin: 28px 0 4px; font-size: 25px; font-weight: 780; }.plan-note { color: var(--muted); font-size: 13px; }.check-list { display: grid; gap: 10px; margin: 24px 0 28px; padding: 0; list-style: none; }.check-list li { color: var(--muted); font-size: 14px; }.check-list li::before { margin-right: 8px; color: var(--accent); content: "✓"; }.comparison-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: 8px; background: var(--surface); }.comparison { width: 100%; min-width: 680px; border-collapse: collapse; }.comparison th, .comparison td { padding: 14px 18px; border-bottom: 1px solid var(--line); text-align: left; }.comparison th { background: var(--surface-subtle); font-size: 13px; }.comparison td { color: var(--muted); font-size: 14px; }.comparison td:first-child { color: var(--ink); font-weight: 700; }.comparison tr:last-child td { border-bottom: 0; }.process { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }.process-card { padding: 22px; border-top: 2px solid var(--accent); background: var(--surface); }.process-card span { display: block; margin-bottom: 22px; color: var(--accent); font: 800 12px/1 ui-monospace, monospace; }.process-card p { margin: 8px 0 0; color: var(--muted); font-size: 14px; }.contact-grid { display: grid; grid-template-columns: .8fr 1.2fr; gap: 28px; }.contact-points { display: grid; gap: 15px; }.contact-point { padding-bottom: 15px; border-bottom: 1px solid var(--line); }.contact-point:last-child { border: 0; }.contact-point strong { display: block; margin-bottom: 4px; }.contact-point p { margin: 0; color: var(--muted); }.form-card { padding: 28px; }.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }.form-field { display: grid; gap: 7px; }.form-field.full { grid-column: 1 / -1; }.form-field label { font-size: 14px; font-weight: 700; }.form-note { margin: 12px 0 0; color: var(--muted); font-size: 13px; }.form-status { display: none; margin-top: 15px; color: var(--success); font-size: 14px; }.form-status.visible { display: block; }

.site-footer { border-top: 1px solid var(--line); background: var(--surface); }.footer-inner { max-width: 1180px; margin: 0 auto; padding: 28px 24px; display: flex; justify-content: space-between; gap: 24px; color: var(--muted); font-size: 13px; }.footer-links { display: flex; flex-wrap: wrap; gap: 14px; }.footer-links a { text-decoration: none; }.footer-links a:hover { color: var(--accent); }

@media (max-width: 900px) { .hero-grid, .query-layout, .contact-grid, .integration { grid-template-columns: 1fr; }.integration-copy { border-right: 0; border-bottom: 1px solid var(--line); }.capability-grid { grid-template-columns: repeat(2, 1fr); }.plans { grid-template-columns: 1fr; }.workflow, .process { grid-template-columns: repeat(2, 1fr); }.workflow-step:not(:last-child)::after { display: none; }.metric-grid { grid-template-columns: repeat(2, 1fr); }.metric:nth-child(2) { border-right: 0; }.metric:nth-child(-n+2) { border-bottom: 1px solid var(--line); }.section-heading { grid-template-columns: 1fr; }.section-heading .section-copy { max-width: 580px; }.site-nav { order: 3; width: 100%; display: none; margin: 0; padding: 10px 0; border-top: 1px solid var(--line); }.site-nav.open { display: grid; }.header-inner { flex-wrap: wrap; padding-top: 10px; padding-bottom: 10px; }.menu-button { display: inline-grid; }.site-nav a { padding: 9px 0; }.header-actions .button-secondary { display: none; } }
@media (max-width: 600px) { .container { width: min(100% - 32px, 1180px); }.header-inner { padding-left: 16px; padding-right: 16px; }.hero { padding: 48px 0; }.section { padding: 58px 0; }.terminal-main { padding: 16px; font-size: 11px; }.request-status { grid-template-columns: 1fr; }.capability-grid, .workflow, .process, .result-grid, .form-grid { grid-template-columns: 1fr; }.metric { border-right: 0; }.metric:nth-child(3) { border-bottom: 1px solid var(--line); }.cta-band { align-items: start; flex-direction: column; padding: 30px; }.query-card, .form-card { padding: 21px; }.query-row { flex-direction: column; }.query-row .button { width: 100%; }.footer-inner { flex-direction: column; padding: 24px 16px; }.page-hero { padding-top: 42px; }.mobile-title-line { display: block; } }

/* Keep action labels readable next to flexible inputs. */
.button { white-space: nowrap; flex-shrink: 0; }
.query-row .text-input { min-width: 0; flex: 1; }
.query-title-row h2 { font-size: 26px; }
.form-card .section-copy { margin-bottom: 24px; }
.form-card > .button { margin-top: 20px; }
.contact-points { margin-top: 28px; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; }
}
/* Public pages share a quiet brand shell and readable mobile controls. */
.legal-hero { border-bottom: 1px solid var(--line); background: var(--surface); }
.legal-hero h1 { line-height: 1.25; }
.legal-version { color: var(--muted); font-size: 13px; }
.legal-tabs { display: flex; flex-wrap: wrap; gap: 8px 24px; margin-top: 28px; }
.legal-tabs a { padding: 8px 0; border-bottom: 2px solid transparent; color: var(--muted); text-decoration: none; }
.legal-tabs a[aria-current='page'] { color: var(--accent); border-color: var(--accent); font-weight: 700; }
.legal-layout { display: grid; grid-template-columns: 230px minmax(0, 1fr); align-items: start; gap: 56px; padding-top: 44px; padding-bottom: 72px; }
.legal-toc { position: sticky; top: 100px; }
.legal-toc h2 { margin-bottom: 16px; font-size: 14px; line-height: 1.5; }
.legal-toc ol { display: grid; gap: 10px; margin: 0; padding: 0; list-style: none; }
.legal-toc a { color: var(--muted); font-size: 13px; text-decoration: none; }
.legal-toc a:hover { color: var(--accent); text-decoration: underline; }
.legal-contact { display: inline-block; margin-top: 24px; }
.legal-document { min-width: 0; max-width: 800px; font-size: 16px; line-height: 1.9; overflow-wrap: anywhere; }
.legal-document h2 { margin: 40px 0 18px; padding-top: 28px; border-top: 1px solid var(--line); font-size: 24px; line-height: 1.45; scroll-margin-top: 100px; }
.legal-document p { margin-bottom: 18px; }
.legal-document a, .form-note a { color: var(--accent); text-underline-offset: 3px; }
.legal-document > p:nth-child(2) { padding: 20px 24px; border-left: 3px solid var(--accent); background: var(--accent-soft); font-size: 15px; }
.legal-back { padding-top: 28px; }
#content { scroll-margin-top: 88px; }
@media (max-width: 900px) {
  .legal-layout { grid-template-columns: 1fr; gap: 32px; }
  .legal-toc { position: static; padding-bottom: 28px; border-bottom: 1px solid var(--line); }
  .legal-toc ol { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px 20px; }
}
@media (max-width: 600px) {
  .legal-layout { padding-top: 28px; padding-bottom: 40px; }
  .legal-document { font-size: 15px; }
  .legal-document h2 { font-size: 21px; }
  .legal-document > p:nth-child(2) { padding: 16px; }
  .legal-toc ol { grid-template-columns: 1fr; }
}
@media print {
  .site-header, .site-footer, .skip-link, .legal-toc, .legal-tabs, .legal-back { display: none; }
  :root, :root[data-theme='dark'] { --canvas: #fff; --surface: #fff; --ink: #000; --muted: #333; --line: #bbb; --accent: #000; --accent-soft: #f5f5f5; color-scheme: light; }
  main { overflow: visible; }
  .container { width: 100%; }
  .legal-layout { display: block; padding: 0; }
  .legal-document { max-width: none; font-size: 11pt; }
  .legal-document h2 { break-after: avoid; }
  .legal-hero { padding: 0 0 20px; }
}
.site-header { position: sticky; top: 0; z-index: 20; }
.header-actions { margin-left: auto; }
.hero-subtitle { display: block; margin-top: 14px; font-size: 32px; line-height: 1.3; }
.request-status { background: #424245; border-color: #424245; }
.request-status div { background: #29292c; color: #d2d2d7; }
.availability { padding: 0; border: 0; background: none; color: var(--accent); }
.availability::before { display: none; }
.hero { background: var(--surface); }
.hero-note { flex-wrap: wrap; gap: 6px 14px; }
.capability-grid { border: 0; border-radius: 0; background: none; gap: 0 32px; }
.capability { min-height: 210px; padding: 26px 0; border-top: 1px solid var(--line); background: none; }
.capability-index { margin-bottom: 24px; }
.integration { border: 0; border-radius: 0; background: none; }
.integration-copy { padding: 0 34px 0 0; border: 0; }
.cta-band { padding: 12px 0; border: 0; border-radius: 0; background: none; }
.icon-button { width: 40px; height: 40px; }
:root[data-theme="dark"] .button:not(.button-secondary) { color: #111; }
@media (max-width: 900px) { .integration-copy { padding: 0; border: 0; } }
@media (max-width: 600px) {
  h1 { font-size: 40px; line-height: 1.15; }
  h2 { font-size: 28px; line-height: 1.3; }
  .page-hero h1 { font-size: 32px; }
  .hero-subtitle { font-size: 26px; }
  .lede { font-size: 16px; }
  .header-inner { gap: 12px; }
  .button-small { min-height: 40px; }
  .terminal-main { overflow-x: auto; }
}

/* Business inquiry: WeChat / QQ contact group. */
.contact-fieldset { display: grid; grid-template-columns: 1fr 1fr; gap: 12px 16px; min-width: 0; margin: 0; padding: 0; border: 0; }
.contact-fieldset legend { margin-bottom: 4px; padding: 0; font-size: 14px; font-weight: 700; }
.contact-fieldset .form-field label { color: var(--muted); font-size: 13px; font-weight: 600; }
.field-hint { grid-column: 1 / -1; margin: 0; color: var(--muted); font-size: 13px; }
.text-input[aria-invalid="true"] { border-color: var(--danger); }
.form-status.is-error { color: var(--danger); }
@media (max-width: 600px) { .contact-fieldset { grid-template-columns: 1fr; } }