:root {
  color-scheme: light;
  --canvas: #f3edde;
  --ink: #2e2a25;
  --muted: #655d52;
  --primary: #5146d8;
  --primary-hover: #4236c3;
  --line: rgba(98,78,42,.20);
  --panel: rgba(248,243,230,.88);
  --field: #fbf7ef;
  --soft: rgba(81,70,216,.09);
  --serif: "Noto Serif SC","Source Han Serif SC","Songti SC",STSong,SimSun,serif;
  font-family: -apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei","Segoe UI",sans-serif;
  background: var(--canvas);
  color: var(--ink);
  scroll-behavior: smooth;
  scrollbar-color: #aaa08f var(--canvas);
  scrollbar-width: thin;
}
* { box-sizing: border-box; }
body { position: relative; isolation: isolate; margin: 0; font-size: 15px; line-height: 1.8; -webkit-font-smoothing: antialiased; }
.scene-backdrop { position: absolute; z-index: -1; inset: 0 0 auto; height: 940px; overflow: hidden; pointer-events: none; }
.scene-backdrop img { display: block; width: 100%; height: 100%; object-fit: cover; object-position: center top; }
.scene-backdrop::after { content: ""; position: absolute; inset: 0; background: linear-gradient(90deg,rgba(243,237,222,.86) 0%,rgba(243,237,222,.55) 44%,rgba(243,237,222,.04) 76%),linear-gradient(0deg,var(--canvas),rgba(243,237,222,0) 38%); }
a { color: inherit; text-decoration: none; text-underline-offset: .2em; }
button { font: inherit; color: inherit; }
button, a, summary { -webkit-tap-highlight-color: transparent; }
button, summary { cursor: pointer; }
button[hidden] { display: none; }
a, button, summary { touch-action: manipulation; }
a:focus-visible, button:focus-visible, summary:focus-visible { outline: 3px solid var(--primary); outline-offset: 5px; }
::selection { background: var(--primary); color: #fff; }
svg { display: block; width: 22px; height: 22px; flex-shrink: 0; fill: none; stroke: currentColor; stroke-width: 1.7; stroke-linecap: round; stroke-linejoin: round; }
h1, h2, h3, p { margin: 0; overflow-wrap: anywhere; }
h1, h2 { font-family: var(--serif); white-space: pre-line; font-weight: 700; text-wrap: balance; }
h2 { font-size: clamp(28px,2.8vw,40px); line-height: 1.45; letter-spacing: -.02em; }
h3 { font-size: 18px; line-height: 1.6; }
p { text-wrap: pretty; }
.wrap { width: min(1320px,calc(100% - 80px)); margin-inline: auto; }
.skip-link { position: fixed; z-index: 10; left: 16px; top: -80px; padding: 10px 20px; color: #fff; background: var(--primary); border-radius: 8px; }
.skip-link:focus { top: 12px; }
.site-header { min-height: 104px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand { display: inline-flex; align-items: center; gap: 11px; min-width: 0; font-family: var(--serif); font-size: 23px; font-weight: 700; line-height: 1.3; }
.brand img { width: 40px; height: 40px; border-radius: 12px; object-fit: contain; flex: 0 0 auto; }
.brand span { overflow-wrap: anywhere; }
.main-nav { display: flex; align-items: center; padding: 5px; gap: 3px; border: 1px solid rgba(255,255,255,.7); border-radius: 32px; background: rgba(248,243,230,.79); backdrop-filter: blur(14px); }
.main-nav a { display: block; padding: 8px 22px; border-radius: 26px; font-size: 14px; font-weight: 600; white-space: nowrap; }
.main-nav a[aria-current] { background: var(--field); color: var(--primary); }
.main-nav a:hover { color: var(--primary); }
.header-tools { display: flex; align-items: center; gap: 24px; }
.theme-toggle { display: inline-flex; justify-content: center; align-items: center; width: 42px; min-height: 42px; background: rgba(251,247,239,.65); border: 1px solid var(--line); border-radius: 50%; }
.theme-toggle:hover { background: var(--field); }
.theme-label { position: absolute; width: 1px; height: 1px; clip-path: inset(50%); overflow: hidden; white-space: nowrap; }
.member-link { display: flex; align-items: center; gap: 8px; font-size: 14px; font-weight: 600; white-space: nowrap; }
.member-link:hover { color: var(--primary); }
.member-link svg { width: 18px; height: 18px; }
.hero { position: relative; min-height: 610px; padding-block: 76px 100px; display: flex; align-items: flex-start; }
.hero-copy { max-width: 650px; }
.hero h1 { font-size: clamp(48px,5.3vw,76px); line-height: 1.22; letter-spacing: -.025em; }
.hero-intro { max-width: 520px; margin-top: 28px; font-size: 17px; line-height: 1.95; }
.hero-actions { display: flex; align-items: center; flex-wrap: wrap; gap: 28px; margin-top: 34px; }
.button { min-height: 52px; display: inline-flex; justify-content: center; align-items: center; gap: 24px; padding: 11px 26px; font-size: 15px; font-weight: 650; line-height: 1.6; border-radius: 30px; transition: background-color .18s ease-out,color .18s ease-out; }
.button-primary { background: var(--primary); color: #fff; }
.button-primary:hover { background: var(--primary-hover); }
.text-link { display: inline-flex; align-items: center; gap: 8px; padding-block: 8px; min-height: 44px; font-size: 14px; font-weight: 600; }
.text-link:hover { color: var(--primary); }
.text-link svg { width: 19px; height: 19px; }
.hero-note { max-width: 470px; margin-top: 24px; font-size: 12px; color: var(--ink); }
.hero-scroll { position: absolute; bottom: 34px; right: 0; display: flex; align-items: center; gap: 12px; font-size: 12px; font-weight: 600; padding: 8px 0; }
.hero-scroll svg { height: 28px; }
.page-content { position: relative; }
.surface { background: var(--panel); border: 1px solid var(--line); border-radius: 22px; }
.services { display: grid; grid-template-columns: .9fr 1.1fr; column-gap: 9%; padding: 58px 62px; }
.section-intro > p { max-width: 340px; margin-top: 20px; color: var(--muted); }
.section-intro > .text-link { margin-top: 24px; color: var(--primary); }
.service-row { display: grid; grid-template-columns: 110px 1fr; align-items: baseline; gap: 24px; padding-block: 23px; border-bottom: 1px solid var(--line); }
.service-row:first-child { padding-top: 2px; }
.service-row h3 { font-size: 22px; letter-spacing: -.02em; font-weight: 650; }
.service-row p { font-size: 14px; color: var(--muted); line-height: 1.85; }
.service-note { margin-top: 20px; font-size: 12px; line-height: 1.8; color: var(--muted); }
.section-block { padding-block: 100px; }
.section-heading { max-width: 780px; }
.section-heading p { margin-top: 17px; color: var(--muted); }
.reason-list { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 36px 90px; margin-top: 42px; }
.reason { display: flex; align-items: flex-start; gap: 16px; padding-top: 20px; border-top: 1px solid var(--line); }
.reason-mark { width: 23px; height: 23px; margin-top: 3px; color: var(--primary); }
.reason p { max-width: 470px; margin-top: 10px; color: var(--muted); font-size: 14px; line-height: 1.9; }
.steps { padding: 49px 62px 54px; }
.steps h2 { font-size: clamp(28px,2.5vw,36px); }
.step-list { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: 40px; list-style: none; margin: 34px 0 0; padding: 0; }
.step-list li { position: relative; min-width: 0; padding-top: 26px; border-top: 1px solid var(--line); }
.step-number { display: block; width: 36px; height: 36px; margin-bottom: 20px; border-radius: 50%; background: var(--soft); color: var(--primary); text-align: center; font-size: 16px; line-height: 36px; font-weight: 700; font-variant-numeric: tabular-nums; }
.step-list p { margin-top: 12px; font-size: 14px; color: var(--muted); line-height: 1.95; }
.tutorial, .agent-video, .codex-video { scroll-margin-top: 24px; }
.tutorial { margin-top: 28px; }
.video-heading { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: baseline; gap: 8px 20px; margin-bottom: 14px; }
.video-heading span, .video-help { color: var(--muted); font-size: 13px; }
.tutorial-player { display: block; width: 100%; height: auto; aspect-ratio: 16 / 9; max-height: 70vh; background: #101018; border-radius: 12px; object-fit: contain; }
.tutorial-player:focus-visible { outline: 3px solid var(--primary); outline-offset: 5px; }
.video-help, .video-error { margin-top: 14px; }
.video-error[hidden] { display: none; }
.agent-video, .codex-video { padding-bottom: 0; }
.agent-video .tutorial-player, .codex-video .tutorial-player { margin-top: 24px; }
.faq { display: grid; grid-template-columns: .8fr 1.2fr; gap: 9%; }
.faq-list { border-top: 1px solid var(--line); }
.faq details { border-bottom: 1px solid var(--line); }
.faq summary { display: flex; justify-content: space-between; align-items: center; gap: 24px; padding: 22px 0; font-size: 16px; font-weight: 600; list-style: none; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary:hover { color: var(--primary); }
.faq summary svg { width: 20px; height: 20px; transition: transform .18s ease-out; }
.faq details[open] summary svg { transform: rotate(45deg); }
.faq details p { max-width: 65ch; padding: 0 44px 24px 0; color: var(--muted); font-size: 14px; line-height: 1.95; }
.closing { display: flex; justify-content: space-between; align-items: center; gap: 32px; padding: 44px 0 49px; border-top: 1px solid var(--line); }
.closing h2 { font-size: clamp(26px,2.5vw,36px); }
.closing p { margin-top: 12px; color: var(--muted); font-size: 14px; }
.closing .button { flex-shrink: 0; }
.site-credit { display: flex; justify-content: space-between; gap: 20px; padding-block: 20px 24px; border-top: 1px solid var(--line); color: var(--muted); font-size: 12px; }
html[data-theme="dark"] { color-scheme: dark; --canvas: #111622; --ink: #f1eada; --muted: #c7bcaa; --primary: #b3a8ff; --primary-hover: #c9c1ff; --line: rgba(223,208,176,.20); --panel: rgba(29,32,44,.94); --field: #272c3a; --soft: rgba(160,145,255,.15); scrollbar-color: #645e78 var(--canvas); }
html[data-theme="dark"] .scene-backdrop::after { background: linear-gradient(90deg,rgba(17,22,34,.91) 0%,rgba(17,22,34,.65) 44%,rgba(17,22,34,.22) 76%),linear-gradient(0deg,var(--canvas),rgba(17,22,34,0) 38%); }
html[data-theme="dark"] .main-nav { background: rgba(29,32,44,.8); border-color: var(--line); }
html[data-theme="dark"] .theme-toggle { background: rgba(29,32,44,.7); }
html[data-theme="dark"] .button-primary, html[data-theme="dark"] .skip-link { color: #171329; }
html[data-theme="dark"] ::selection { color: #171329; }
@media (min-width: 1800px) { .scene-backdrop img { object-position: center 38%; } }
@media (min-width: 1101px) and (max-width: 1199px) { .main-nav a { padding-inline: 18px; } }
@media (max-width: 1100px) {
  .wrap { width: calc(100% - 56px); }
  .site-header { gap: 16px; flex-wrap: wrap; padding-block: 20px; }
  .main-nav { order: 3; width: 100%; justify-content: center; }
  .header-tools { gap: 14px; }
  .brand { font-size: 20px; }
  .main-nav a { padding-inline: 17px; }
  .hero { min-height: 590px; }
  .services, .steps { padding: 42px; }
  .services { column-gap: 6%; }
  .service-row { grid-template-columns: 1fr; gap: 6px; }
  .reason-list { gap: 32px 50px; }
  .faq { gap: 6%; }
}
@media (max-width: 767px) {
  .wrap { width: calc(100% - 36px); }
  body { font-size: 14px; }
  .scene-backdrop { height: 890px; }
  .scene-backdrop img { object-position: 62% top; }
  .scene-backdrop::after { background: linear-gradient(90deg,rgba(243,237,222,.88),rgba(243,237,222,.48)),linear-gradient(0deg,var(--canvas),rgba(243,237,222,0) 48%); }
  .site-header { display: grid; grid-template-columns: 1fr auto; min-height: 136px; padding-block: 19px 0; gap: 18px 12px; }
  .brand { font-size: 20px; gap: 9px; }
  .brand img { width: 36px; height: 36px; border-radius: 10px; }
  .header-tools { gap: 12px; }
  .theme-toggle { width: 36px; min-height: 36px; }
  .theme-toggle svg { width: 19px; height: 19px; }
  .member-link { font-size: 12px; }
  .member-link svg { display: none; }
  .main-nav { grid-column: 1/-1; grid-row: 2; width: 100%; display: flex; flex-wrap: wrap; justify-content: center; border-radius: 18px; }
  .main-nav a { flex: 1 1 28%; min-height: 44px; text-align: center; font-size: 13px; padding: 10px 8px; }
  .hero { min-height: 505px; padding-block: 44px 74px; }
  .hero h1 { font-size: clamp(40px,10.8vw,56px); line-height: 1.25; }
  .hero-intro { max-width: 440px; font-size: 15px; line-height: 1.95; margin-top: 23px; }
  .hero-actions { gap: 18px; margin-top: 27px; }
  .button { padding: 11px 22px; gap: 18px; min-height: 49px; font-size: 14px; }
  .hero-actions .text-link { font-size: 12px; gap: 3px; }
  .hero-note { margin-top: 20px; font-size: 11px; max-width: 340px; }
  .hero-scroll { right: 2px; bottom: 20px; font-size: 11px; }
  .hero-scroll svg { width: 18px; height: 22px; }
  .services { grid-template-columns: 1fr; padding: 28px 24px; }
  h2 { font-size: 29px; }
  .section-intro > p { margin-top: 15px; font-size: 14px; max-width: none; }
  .section-intro > .text-link { margin-top: 12px; }
  .service-list { margin-top: 26px; }
  .service-row { padding-block: 20px; grid-template-columns: 90px minmax(0,1fr); gap: 14px; }
  .service-row h3 { font-size: 19px; }
  .service-row p { font-size: 12px; line-height: 1.9; }
  .service-note { font-size: 11px; }
  .section-block { padding-block: 62px; }
  .section-heading p { margin-top: 14px; }
  .reason-list { grid-template-columns: 1fr; margin-top: 26px; gap: 24px; }
  .reason { gap: 12px; padding-top: 18px; }
  .reason h3 { font-size: 17px; }
  .reason p { margin-top: 8px; font-size: 13px; max-width: none; }
  .steps { padding: 28px 24px 30px; }
  .steps h2 { font-size: 27px; }
  .step-list { grid-template-columns: 1fr; margin-top: 24px; gap: 24px; }
  .step-list li { padding: 21px 0 0 52px; }
  .step-number { position: absolute; top: 21px; left: 0; margin: 0; }
  .step-list h3 { font-size: 17px; }
  .step-list p { font-size: 13px; margin-top: 8px; }
  .faq { grid-template-columns: 1fr; gap: 28px; }
  .faq h2 { white-space: normal; }
  .faq summary { gap: 16px; font-size: 15px; padding-block: 19px; }
  .faq details p { padding: 0 26px 20px 0; font-size: 13px; }
  .closing { align-items: flex-start; flex-direction: column; padding: 32px 0 34px; gap: 23px; }
  .closing h2 { font-size: 27px; }
  .closing p { margin-top: 10px; font-size: 13px; }
  .site-credit { padding-block: 17px 22px; font-size: 10px; gap: 10px; }
  html[data-theme="dark"] .scene-backdrop::after { background: linear-gradient(90deg,rgba(17,22,34,.92),rgba(17,22,34,.64)),linear-gradient(0deg,var(--canvas),rgba(17,22,34,0) 48%); }
}
@media (max-width: 360px) {
  .wrap { width: calc(100% - 28px); }
  .brand { font-size: 17px; gap: 7px; }
  .brand img { width: 32px; height: 32px; }
  .header-tools { gap: 8px; }
  .hero-actions { gap: 8px; }
  .hero-actions .button { padding-inline: 17px; gap: 12px; }
  .hero-actions .text-link { font-size: 11px; }
  .services, .steps { padding-inline: 20px; }
  .service-row { grid-template-columns: 1fr; gap: 5px; }
  .site-credit { flex-direction: column; gap: 2px; }
}
@media (prefers-reduced-motion: reduce) { :root { scroll-behavior: auto; } *, *::before, *::after { transition: none !important; } }

/* Tutorial reading page inherits the storefront palette and type. */
.faq-tutorial-link { display: flex; justify-content: space-between; gap: 20px; padding-block: 20px; border-bottom: 1px solid var(--line); font-weight: 600; }
.faq-tutorial-link:hover { color: var(--primary); }
.faq-tutorial-link svg { flex-shrink: 0; }
.tutorial-main { max-width: 1120px; padding-top: 45px; }
.tutorial-page-heading { display: flex; align-items: flex-end; justify-content: space-between; gap: 24px; padding-bottom: 30px; }
.tutorial-page-heading h1 { font-size: clamp(38px,5vw,56px); line-height: 1.3; }
.tutorial-page-heading p { margin-top: 16px; color: var(--muted); }
.tutorial-page-heading > a { flex-shrink: 0; }
.tutorial-index { position: sticky; top: 12px; z-index: 2; display: flex; flex-wrap: wrap; gap: 8px 28px; padding: 12px 22px; background: var(--field); border: 1px solid var(--line); border-radius: 12px; }
.tutorial-index a { display: inline-flex; align-items: center; min-height: 40px; font-size: 14px; font-weight: 650; }
.tutorial-index a:hover { color: var(--primary); }
.tutorial-section { padding-block: 54px; border-bottom: 1px solid var(--line); scroll-margin-top: 100px; }
.tutorial-section h2 { font-size: clamp(26px,3vw,36px); }
.tutorial-intro { max-width: 70ch; margin-bottom: 22px; color: var(--muted); }
.tutorial-steps { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: 30px; margin: 28px 0 14px; padding-left: 20px; }
.tutorial-steps li { padding-left: 5px; }
.tutorial-steps h3 { font-size: 15px; }
.tutorial-steps p { margin-top: 8px; color: var(--muted); font-size: 13px; }
.tutorial-download-link, .tutorial-return { margin-top: 20px; }
.tutorial-return { margin-bottom: 28px; }
@media (max-width: 767px) {
  .tutorial-main { padding-top: 26px; }
  .tutorial-page-heading { align-items: flex-start; flex-direction: column; gap: 12px; }
  .tutorial-page-heading p { font-size: 14px; }
  .tutorial-index { top: 8px; gap: 2px 18px; padding: 10px 14px; }
  .tutorial-index a { min-height: 40px; font-size: 13px; }
  .tutorial-section { padding-block: 36px; scroll-margin-top: 132px; }
  .tutorial-steps { grid-template-columns: 1fr; gap: 18px; }
}