:root {
  color: #18213a;
  background: #f4f6fb;
  font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "SF Pro Display", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-synthesis: none;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; min-width: 320px; background: radial-gradient(circle at 82% 0, #dce4ff 0, transparent 28rem), #f4f6fb; }
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }

.site-header {
  position: sticky;
  z-index: 20;
  top: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
  padding: 0 max(28px, calc((100vw - 1180px) / 2));
  border-bottom: 1px solid #dfe4efcc;
  background: #f7f9fddd;
  backdrop-filter: blur(18px);
}
.brand { display: flex; align-items: center; gap: 11px; }
.brand-mark { display: grid; place-items: center; width: 40px; height: 40px; border-radius: 13px; color: white; font-size: 17px; font-weight: 900; background: linear-gradient(135deg, #6175eb, #37b9a8); box-shadow: 0 10px 24px #4054bd35; }
.brand strong, .brand small { display: block; }
.brand strong { font-size: 14px; }
.brand small { margin-top: 2px; color: #8490a8; font-size: 10px; }
.support-link { padding: 10px 14px; border: 1px solid #d9dfeb; border-radius: 11px; color: #66718a; font-size: 12px; background: #fff; }
.support-link b { margin-left: 5px; color: #4054c4; }

main { width: min(1180px, calc(100% - 40px)); margin: 0 auto; }
.hero { display: grid; grid-template-columns: minmax(0, 1.45fr) minmax(320px, .7fr); gap: 42px; align-items: center; min-height: 590px; padding: 72px 0; }
.eyebrow { color: #5366d1; font-size: 11px; font-weight: 900; letter-spacing: .17em; }
.hero h1 { margin: 15px 0 22px; color: #17213a; font-size: clamp(42px, 5.3vw, 70px); line-height: 1.04; letter-spacing: -.055em; }
.hero-copy > p { max-width: 700px; margin: 0; color: #68748d; font-size: 17px; line-height: 1.8; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 30px; }
.hero-actions a { padding: 14px 20px; border-radius: 13px; font-size: 13px; font-weight: 850; }
.hero-actions .primary { color: white; background: #253a9f; box-shadow: 0 14px 32px #334bb836; }
.hero-actions .secondary { color: #43506d; border: 1px solid #dbe0ea; background: #fff; }
.trust-row { display: flex; flex-wrap: wrap; gap: 15px; margin-top: 24px; color: #768299; font-size: 11px; }
.trust-row span::first-letter { color: #2ca083; }
.hero-card { padding: 28px; border: 1px solid #dfe5ef; border-radius: 24px; background: #ffffffc9; box-shadow: 0 24px 70px #25355f12; backdrop-filter: blur(12px); }
.card-kicker { color: #8893a8; font-size: 10px; font-weight: 850; letter-spacing: .14em; }
.hero-card ol { display: grid; gap: 20px; margin: 23px 0; padding: 0; list-style: none; counter-reset: prep; }
.hero-card li { position: relative; min-height: 36px; padding-left: 47px; counter-increment: prep; }
.hero-card li::before { content: counter(prep); position: absolute; left: 0; top: 0; display: grid; place-items: center; width: 33px; height: 33px; border-radius: 10px; color: #4055c5; font-weight: 900; background: #e9edff; }
.hero-card b, .hero-card small { display: block; }
.hero-card b { font-size: 13px; }
.hero-card small { margin-top: 5px; color: #8c96a9; font-size: 10px; line-height: 1.45; }
.hero-card > p { margin: 0; padding-top: 18px; border-top: 1px solid #e8ebf1; color: #7f899d; font-size: 10px; }

.notice { display: grid; grid-template-columns: 100px 1fr; gap: 22px; align-items: center; margin-bottom: 78px; padding: 20px 24px; border: 1px solid #d7e9e3; border-radius: 16px; color: #42695f; background: #effaf6; }
.notice span { font-size: 12px; font-weight: 900; }
.notice p { margin: 0; font-size: 12px; line-height: 1.7; }

.steps { scroll-margin-top: 100px; }
.section-heading { max-width: 720px; margin-bottom: 30px; }
.section-heading h2 { margin: 9px 0 8px; font-size: clamp(31px, 3.6vw, 46px); letter-spacing: -.045em; }
.section-heading p { margin: 0; color: #7c879d; line-height: 1.7; }
.step-card { display: grid; grid-template-columns: .65fr 1.35fr; gap: 32px; align-items: start; margin-bottom: 24px; padding: 30px; border: 1px solid #e0e5ef; border-radius: 24px; background: #fff; box-shadow: 0 16px 44px #28385a0a; }
.step-copy { position: sticky; top: 105px; display: grid; grid-template-columns: 46px 1fr; gap: 15px; align-items: start; padding: 9px 2px; }
.step-no { display: grid; place-items: center; width: 44px; height: 44px; border-radius: 13px; color: #4055c5; font-size: 12px; font-weight: 900; background: #ebefff; }
.step-copy h3 { margin: 3px 0 10px; font-size: 23px; letter-spacing: -.025em; }
.step-copy p { margin: 0; color: #788398; font-size: 13px; line-height: 1.75; }
code { padding: 2px 5px; border-radius: 5px; color: #4a58a4; font-family: ui-monospace, SFMono-Regular, Menlo, monospace; background: #eef0f8; }
figure { margin: 0; overflow: hidden; border: 1px solid #e5e9f1; border-radius: 17px; background: #f8f9fc; }
figure img { width: 100%; height: auto; }
figcaption { padding: 11px 14px; color: #8b95a7; font-size: 10px; }
.image-pair { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.text-step { min-height: 250px; grid-template-columns: 1fr; background: linear-gradient(135deg, #172440, #263c86); }
.text-step .step-copy { position: static; grid-template-columns: 54px minmax(0, 760px); justify-content: center; }
.text-step .step-no { color: white; background: #ffffff1a; }
.text-step h3 { color: white; }
.text-step .step-copy p { color: #ccd5ed; }
.system-box { display: flex; gap: 14px; align-items: center; margin-top: 22px; padding: 16px; border: 1px solid #ffffff17; border-radius: 14px; background: #ffffff0a; }
.system-box > span { font-size: 26px; }
.system-box b, .system-box small { display: block; }
.system-box b { color: white; font-size: 12px; }
.system-box small { margin-top: 3px; color: #aebbd9; font-size: 10px; line-height: 1.5; }

.faq { margin: 100px 0 72px; }
.faq details { border-top: 1px solid #dce2ec; }
.faq details:last-child { border-bottom: 1px solid #dce2ec; }
.faq summary { padding: 22px 3px; cursor: pointer; font-size: 15px; font-weight: 780; }
.faq details p { max-width: 850px; margin: -5px 0 22px; color: #727e94; font-size: 13px; line-height: 1.8; }
.support-card { display: flex; align-items: center; justify-content: space-between; gap: 35px; margin-bottom: 70px; padding: 42px; border-radius: 26px; color: white; background: radial-gradient(circle at 92% 10%, #7085ec 0, transparent 30%), linear-gradient(135deg, #182643, #263d98); box-shadow: 0 25px 65px #223b9333; }
.support-card .eyebrow { color: #8fe6dc; }
.support-card h2 { margin: 10px 0 8px; font-size: 31px; letter-spacing: -.035em; }
.support-card p { max-width: 720px; margin: 0; color: #c1cae2; line-height: 1.65; }
.support-card a { flex: 0 0 auto; padding: 16px 20px; border-radius: 14px; color: #233474; background: white; }
.support-card a span, .support-card a b { display: block; }
.support-card a span { color: #8390a8; font-size: 9px; }
.support-card a b { margin-top: 5px; font-size: 13px; }
footer { display: flex; justify-content: space-between; width: min(1180px, calc(100% - 40px)); margin: 0 auto; padding: 25px 0 35px; border-top: 1px solid #dfe4ed; color: #929bad; font-size: 10px; }
.floating-support { position: fixed; z-index: 30; right: 22px; bottom: 22px; display: grid; place-items: center; width: 53px; height: 53px; border: 1px solid #ffffff24; border-radius: 18px; color: white; font-size: 11px; font-weight: 850; background: #263b9d; box-shadow: 0 14px 38px #253b944d; }

@media (max-width: 860px) {
  .site-header { padding: 0 20px; }
  .support-link { font-size: 0; }
  .support-link b { margin: 0; font-size: 11px; }
  .hero { grid-template-columns: 1fr; gap: 25px; padding: 58px 0; }
  .hero h1 { font-size: clamp(39px, 11vw, 60px); }
  .hero-card { max-width: none; }
  .notice { grid-template-columns: 1fr; gap: 7px; }
  .step-card { grid-template-columns: 1fr; padding: 19px; }
  .step-copy { position: static; }
  .image-pair { grid-template-columns: 1fr; }
  .support-card { align-items: flex-start; flex-direction: column; padding: 30px; }
}

@media (max-width: 520px) {
  main { width: min(100% - 26px, 1180px); }
  .site-header { height: 68px; }
  .brand-mark { width: 36px; height: 36px; }
  .hero { min-height: 0; padding: 45px 0; }
  .hero-copy > p { font-size: 14px; }
  .hero-actions a { flex: 1 1 100%; text-align: center; }
  .trust-row { display: grid; gap: 8px; }
  .notice { margin-bottom: 55px; padding: 17px; }
  .step-card { border-radius: 18px; }
  .step-copy { grid-template-columns: 39px 1fr; gap: 11px; }
  .step-no { width: 38px; height: 38px; }
  .step-copy h3 { font-size: 20px; }
  .text-step .step-copy { grid-template-columns: 1fr; }
  .support-card h2 { font-size: 27px; }
  footer { width: calc(100% - 26px); }
}