:root {
  color-scheme: light;
  --bg: #fff9f1;
  --surface: rgba(255, 255, 255, 0.74);
  --ink: #27231f;
  --muted: #756e66;
  --brand: #ed7b3b;
  --brand-dark: #a94c1e;
  --line: rgba(91, 72, 51, 0.12);
  --shadow: 0 30px 90px rgba(128, 78, 36, 0.15);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  min-width: 320px;
  color: var(--ink);
  background: var(--bg);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
  overflow-x: hidden;
}
body[data-product="gpt"] {
  --bg: #f3f0ea;
  --surface: rgba(255, 255, 255, 0.72);
  --ink: #18221f;
  --muted: #65706c;
  --brand: #1f806c;
  --brand-dark: #125548;
  --line: rgba(18, 55, 47, 0.12);
  --shadow: 0 30px 90px rgba(22, 57, 49, 0.16);
}
button, a { -webkit-tap-highlight-color: transparent; }
button { font: inherit; }
.ambient { position: fixed; z-index: -1; border-radius: 50%; filter: blur(4px); pointer-events: none; }
.ambient-one { width: 420px; height: 420px; right: -120px; top: -130px; background: rgba(244, 163, 101, 0.24); }
.ambient-two { width: 330px; height: 330px; left: -150px; top: 48%; background: rgba(255, 211, 158, 0.2); }
body[data-product="gpt"] .ambient-one { background: rgba(53, 137, 117, 0.17); }
body[data-product="gpt"] .ambient-two { background: rgba(198, 164, 107, 0.18); }
.page-shell { width: min(1180px, calc(100% - 48px)); margin: 0 auto; }
.site-header { height: 92px; display: flex; align-items: center; justify-content: space-between; }
.brand { display: inline-flex; align-items: center; gap: 11px; color: var(--ink); text-decoration: none; font-size: 20px; font-weight: 760; letter-spacing: .04em; }
.brand-mark { width: 38px; height: 38px; display: inline-grid; place-items: center; border-radius: 13px; color: white; background: var(--brand); box-shadow: 0 9px 24px color-mix(in srgb, var(--brand) 28%, transparent); }
.header-action, .primary-action { min-height: 48px; border: 0; border-radius: 16px; padding: 0 23px; color: white; background: var(--brand-dark); font-weight: 700; cursor: pointer; box-shadow: 0 12px 28px color-mix(in srgb, var(--brand-dark) 20%, transparent); }
.header-action { min-height: 43px; padding: 0 19px; background: var(--surface); color: var(--brand-dark); border: 1px solid var(--line); box-shadow: none; backdrop-filter: blur(18px); }
.hero { min-height: 650px; display: grid; grid-template-columns: 1.05fr .95fr; align-items: center; gap: 70px; padding: 56px 2vw 90px; }
.eyebrow { margin: 0 0 18px; color: var(--brand-dark); font-size: 14px; font-weight: 760; letter-spacing: .16em; }
h1 { margin: 0; font-size: clamp(58px, 7vw, 92px); line-height: .99; letter-spacing: -.07em; font-weight: 780; }
h1 em { color: var(--brand); font-style: normal; }
.hero-description { max-width: 540px; margin: 28px 0 0; color: var(--muted); font-size: 19px; line-height: 1.85; }
.hero-actions { margin-top: 34px; display: flex; align-items: center; gap: 24px; }
.primary-action { display: inline-flex; align-items: center; justify-content: center; gap: 10px; }
.wechat-dot { width: 9px; height: 9px; border-radius: 50%; background: #70da80; box-shadow: 0 0 0 4px rgba(112, 218, 128, .16); }
.quiet-link { color: var(--muted); font-size: 14px; text-decoration: none; }
.product-stage { position: relative; min-height: 530px; display: grid; place-items: center; }
.stage-glow { position: absolute; width: 430px; height: 430px; border-radius: 45% 55% 60% 40%; background: linear-gradient(145deg, color-mix(in srgb, var(--brand) 30%, white), color-mix(in srgb, var(--brand) 8%, white)); transform: rotate(-8deg); }
.phone { position: relative; width: 284px; min-height: 552px; padding: 16px 17px 24px; border: 9px solid #26231f; border-radius: 44px; background: #fffaf3; box-shadow: var(--shadow); transform: rotate(2.5deg); }
body[data-product="gpt"] .phone { background: #f7f5f0; border-color: #17221f; }
.phone-top { display: flex; justify-content: space-between; padding: 0 10px 15px; font-size: 10px; font-weight: 700; }
.mini-title { font-size: 19px; font-weight: 800; letter-spacing: .06em; }
.mini-heading { padding: 24px 1px 18px; display: grid; gap: 7px; }
.mini-heading strong { font-size: 24px; letter-spacing: -.04em; }
.mini-heading span { color: var(--muted); font-size: 11px; }
.screen-card { border: 1px solid var(--line); border-radius: 18px; background: rgba(255,255,255,.86); box-shadow: 0 10px 28px rgba(73,55,40,.08); }
.screen-tabs { display: flex; gap: 18px; padding: 15px 16px 10px; color: var(--muted); font-size: 12px; font-weight: 700; }
.screen-tabs .active { color: var(--brand-dark); }
.screen-search { margin: 3px 10px 11px; min-height: 41px; display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 7px; padding-left: 10px; border-radius: 12px; background: color-mix(in srgb, var(--brand) 7%, white); color: #9b938a; font-size: 10px; }
.screen-search b { align-self: stretch; display: grid; place-items: center; padding: 0 11px; border-radius: 11px; color: white; background: var(--brand); }
.screen-list { margin-top: 14px; display: grid; gap: 9px; }
.screen-list > div { min-height: 65px; display: grid; grid-template-columns: 37px 1fr auto; align-items: center; gap: 11px; padding: 9px 13px; border: 1px solid var(--line); border-radius: 16px; background: rgba(255,255,255,.78); }
.screen-list i { width: 35px; height: 35px; display: grid; place-items: center; border-radius: 12px; color: var(--brand-dark); background: color-mix(in srgb, var(--brand) 15%, white); font-style: normal; font-weight: 800; }
.screen-list span { display: grid; gap: 3px; }
.screen-list b { font-size: 12px; }
.screen-list small { color: var(--muted); font-size: 9px; }
.screen-list strong { color: var(--brand); font-size: 18px; }
.services { padding: 110px 0 130px; }
.section-heading { display: flex; align-items: end; justify-content: space-between; gap: 30px; margin-bottom: 44px; }
.section-heading .eyebrow { margin: 0; max-width: 300px; }
h2 { margin: 0; font-size: clamp(36px, 4.3vw, 58px); line-height: 1.08; letter-spacing: -.055em; }
.service-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
.service-grid article { min-height: 250px; padding: 25px; border: 1px solid var(--line); border-radius: 25px; background: var(--surface); backdrop-filter: blur(18px); transition: transform .2s ease, box-shadow .2s ease; }
.service-grid article:hover { transform: translateY(-5px); box-shadow: 0 20px 45px rgba(81,59,41,.08); }
.service-grid article > span { color: var(--brand); font-size: 12px; font-weight: 800; }
.service-grid h3 { margin: 72px 0 13px; font-size: 21px; }
.service-grid p { margin: 0; color: var(--muted); font-size: 14px; line-height: 1.75; }
.final-cta { margin: 0 0 92px; padding: 56px 62px; display: flex; align-items: center; justify-content: space-between; gap: 40px; border-radius: 34px; background: var(--ink); color: white; overflow: hidden; }
.final-cta .eyebrow { color: color-mix(in srgb, var(--brand) 80%, white); }
.final-cta p:last-child { margin: 16px 0 0; color: rgba(255,255,255,.65); }
.final-cta .primary-action { flex: none; background: var(--brand); }
.site-footer { min-height: 130px; display: flex; align-items: center; justify-content: space-between; border-top: 1px solid var(--line); }
.footer-identity { display: flex; align-items: center; gap: 13px; }
.footer-identity div { display: grid; gap: 4px; }
.footer-identity small, .legal { color: var(--muted); font-size: 12px; }
.legal { text-align: right; }
.legal p { margin: 0 0 7px; }
.legal a { color: var(--muted); text-decoration: none; }
.launch-dialog { width: min(410px, calc(100% - 32px)); padding: 38px 34px 31px; border: 0; border-radius: 28px; text-align: center; color: var(--ink); background: #fff; box-shadow: 0 30px 100px rgba(0,0,0,.25); }
.launch-dialog::backdrop { background: rgba(31,27,23,.5); backdrop-filter: blur(5px); }
.dialog-close { position: absolute; right: 17px; top: 12px; border: 0; background: none; color: #8e8983; font-size: 27px; cursor: pointer; }
.dialog-mark { width: 62px; height: 62px; display: grid; place-items: center; margin: 0 auto 18px; border-radius: 20px; color: white; background: var(--brand); font-size: 28px; font-weight: 800; }
.launch-dialog h2 { font-size: 25px; letter-spacing: -.03em; }
.launch-dialog p { margin: 15px 0 24px; color: var(--muted); }
.dialog-confirm { min-height: 45px; width: 100%; border: 0; border-radius: 14px; color: white; background: var(--brand-dark); font-weight: 700; cursor: pointer; }

@media (max-width: 850px) {
  .page-shell { width: min(100% - 32px, 680px); }
  .site-header { height: 76px; }
  .hero { grid-template-columns: 1fr; gap: 36px; padding: 56px 0 78px; }
  .hero-copy { text-align: center; }
  .hero-description { margin-left: auto; margin-right: auto; }
  .hero-actions { justify-content: center; }
  .product-stage { min-height: 510px; }
  .section-heading { display: block; }
  .section-heading .eyebrow { margin-bottom: 17px; }
  .service-grid { grid-template-columns: 1fr 1fr; }
  .final-cta { padding: 44px 34px; display: grid; text-align: center; }
  .final-cta .primary-action { justify-self: center; }
}

@media (max-width: 520px) {
  .page-shell { width: calc(100% - 28px); }
  .brand { font-size: 17px; }
  .brand-mark { width: 34px; height: 34px; border-radius: 11px; }
  .header-action { min-height: 40px; padding: 0 15px; }
  .hero { padding-top: 48px; }
  h1 { font-size: clamp(50px, 15.5vw, 66px); }
  .hero-description { font-size: 16px; line-height: 1.75; }
  .hero-actions { display: grid; justify-items: center; }
  .product-stage { min-height: 480px; transform: scale(.9); margin: -25px 0; }
  .services { padding: 90px 0; }
  .service-grid { grid-template-columns: 1fr; }
  .service-grid article { min-height: auto; }
  .service-grid h3 { margin-top: 42px; }
  .final-cta { margin-bottom: 56px; padding: 39px 23px; }
  .site-footer { padding: 28px 0; display: grid; justify-content: center; gap: 25px; text-align: center; }
  .footer-identity { justify-content: center; }
  .legal { text-align: center; }
}