:root {
  color-scheme: light;
  --ivory: #fbf7ee;
  --paper: #fffdf8;
  --mist: #edf2ef;
  --graphite: #172126;
  --muted: #5c686a;
  --teal: #0f6b66;
  --teal-dark: #083f3d;
  --amber: #bd842d;
  --blue: #356b8c;
  --success: #2f8b57;
  --pending: #c4912d;
  --failed: #b94b4b;
  --line: #d8ded8;
  --shadow: 0 18px 50px rgba(23, 33, 38, .09);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }
body { margin: 0; background: var(--ivory); color: var(--graphite); }
a { color: inherit; }
.skip-link { position: absolute; left: 12px; top: -80px; background: var(--graphite); color: white; padding: 10px 14px; z-index: 10; }
.skip-link:focus { top: 12px; }
.site-header {
  min-height: 74px; display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 22px;
  padding: 14px clamp(18px, 5vw, 70px); background: rgba(251, 247, 238, .92); border-bottom: 1px solid var(--line);
  position: sticky; top: 0; z-index: 5; backdrop-filter: blur(12px);
}
.brand, .footer-brand { display: inline-flex; gap: 10px; align-items: center; text-decoration: none; font-weight: 850; line-height: .95; letter-spacing: 0; text-transform: uppercase; font-size: 13px; }
.site-nav { display: flex; justify-content: center; gap: 22px; font-size: 14px; color: #2e393d; }
.site-nav a { text-decoration: none; white-space: nowrap; }
.site-nav a:hover, .text-link:hover { color: var(--teal); }
.header-cta, .button {
  display: inline-flex; min-height: 44px; align-items: center; justify-content: center; padding: 0 18px; border-radius: 6px;
  text-decoration: none; font-weight: 760; border: 1px solid transparent; cursor: pointer;
}
.header-cta, .button.primary { background: var(--teal); color: white; }
.button.secondary { background: transparent; color: var(--graphite); border-color: #aeb9b4; }
.menu-toggle { display: none; }
.hero, .sub-hero, .section, .contact-layout, .legal { width: min(1180px, calc(100% - 36px)); margin-inline: auto; }
.split-hero { display: grid; grid-template-columns: minmax(0, 1fr) minmax(420px, .95fr); gap: 42px; align-items: center; padding: 82px 0 34px; }
.eyebrow { margin: 0 0 14px; color: var(--teal); font-size: 12px; font-weight: 850; letter-spacing: .08em; }
h1, h2, h3, p { overflow-wrap: anywhere; }
h1 { margin: 0; font-size: clamp(40px, 6vw, 72px); line-height: .96; letter-spacing: 0; max-width: 820px; }
h2 { margin: 0; font-size: clamp(28px, 3vw, 44px); line-height: 1.05; letter-spacing: 0; }
h3 { margin: 0 0 10px; font-size: 19px; line-height: 1.2; }
p { color: var(--muted); line-height: 1.7; }
.lead { font-size: 19px; max-width: 680px; color: #3e4b4e; }
.button-row { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 28px; }
.ops-visual {
  position: relative; min-height: 520px; border: 1px solid #d3ddd6; border-radius: 8px; background:
    linear-gradient(90deg, rgba(15,107,102,.06) 1px, transparent 1px),
    linear-gradient(180deg, rgba(15,107,102,.06) 1px, transparent 1px), var(--paper);
  background-size: 32px 32px; box-shadow: var(--shadow); overflow: hidden;
}
.ops-visual:before { content: ""; position: absolute; inset: 64px 64px; border: 1px solid rgba(15,107,102,.22); border-radius: 999px; transform: rotate(-10deg); }
.visual-node { position: absolute; width: 188px; padding: 15px; background: rgba(255,253,248,.96); border: 1px solid var(--line); border-radius: 8px; box-shadow: 0 10px 28px rgba(23,33,38,.08); }
.visual-node span { display: block; color: #415054; font-size: 13px; margin-bottom: 9px; }
code { font-family: "SFMono-Regular", Consolas, ui-monospace, monospace; font-size: 13px; color: var(--teal-dark); }
.request { left: 28px; top: 44px; } .route { right: 34px; top: 86px; } .status { left: 108px; top: 214px; } .order { right: 42px; bottom: 96px; } .event { left: 42px; bottom: 42px; }
.moving-dot { position: absolute; width: 13px; height: 13px; border-radius: 99px; background: var(--amber); left: 68px; top: 92px; animation: route 6s infinite ease-in-out; }
@keyframes route { 0%,100% { transform: translate(0,0); } 30% { transform: translate(335px,45px); } 62% { transform: translate(205px,258px); } 82% { transform: translate(32px,350px); } }
.cap-strip { width: min(1180px, calc(100% - 36px)); margin: 0 auto 42px; display: flex; flex-wrap: wrap; gap: 10px; }
.cap-strip span, .stack-list span, .mini-list span { border: 1px solid var(--line); background: rgba(255,253,248,.7); padding: 10px 13px; border-radius: 6px; font-size: 12px; font-weight: 850; color: #334044; }
.section { padding: 64px 0; }
.section-intro { max-width: 760px; margin-bottom: 28px; }
.flow-rail { display: grid; grid-template-columns: repeat(5, 1fr); gap: 0; background: var(--paper); border: 1px solid var(--line); border-radius: 8px; overflow: hidden; }
.flow-rail div { min-height: 140px; padding: 24px; border-right: 1px solid var(--line); display: flex; flex-direction: column; justify-content: space-between; }
.flow-rail div:last-child { border-right: 0; }
.flow-rail span { width: 16px; height: 16px; border-radius: 50%; background: var(--amber); box-shadow: 0 0 0 8px rgba(189,132,45,.12); }
.flow-rail strong { font-size: 14px; }
.module-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.module-grid.uneven { grid-template-columns: 1.2fr .8fr 1fr; }
.module { background: var(--paper); border: 1px solid var(--line); border-radius: 8px; padding: 24px; min-height: 230px; display: flex; flex-direction: column; }
.module a { margin-top: auto; color: var(--teal); font-weight: 760; text-decoration: none; }
.scenario-grid, .faq-grid, .state-explain { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.scenario-grid article, .faq-grid article, .state-explain article, .method-card { background: rgba(255,253,248,.78); border-top: 3px solid var(--teal); padding: 22px; border-radius: 8px; }
.notice { border-left: 4px solid var(--amber); padding: 14px 18px; background: rgba(189,132,45,.08); color: #4b4030; }
.state-board { width: min(1180px, calc(100% - 36px)); margin: 42px auto; display: grid; grid-template-columns: 1fr 1fr; gap: 32px; padding: 46px; border-radius: 8px; background: var(--teal-dark); color: white; }
.state-board p, .state-board .eyebrow { color: #d7ebe6; }
.event-list { display: grid; gap: 12px; }
.event-list code { color: #fff8e6; padding: 16px 18px; background: rgba(255,255,255,.08); border: 1px solid rgba(255,255,255,.16); border-radius: 6px; transform: translateX(calc(var(--i) * 12px)); }
.check-grid { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(5, 1fr); gap: 12px; }
.check-grid li { background: var(--paper); border: 1px solid var(--line); border-radius: 6px; padding: 15px; font-weight: 680; }
.check-grid li:before { content: ""; display: inline-block; width: 9px; height: 9px; margin-right: 8px; border-radius: 50%; background: var(--teal); }
.comparison-table { display: grid; grid-template-columns: .8fr 1fr 1fr; border: 1px solid var(--line); border-radius: 8px; overflow: hidden; background: var(--paper); }
.comparison-table div { padding: 16px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); color: #465256; }
.comparison-table .head { background: #edf3ef; color: var(--graphite); font-weight: 850; }
.sub-hero { padding: 74px 0 34px; }
.architecture-diagram { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 12px; }
.architecture-diagram div { min-height: 132px; padding: 18px; background: var(--paper); border: 1px solid var(--line); border-radius: 8px; display: flex; flex-direction: column; justify-content: space-between; }
.architecture-diagram .highlight { background: #e8f3ef; border-color: var(--teal); box-shadow: inset 0 0 0 1px rgba(15,107,102,.25); }
.architecture-diagram span { color: var(--amber); font-weight: 850; }
.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 28px; }
.stack-list, .mini-list { display: flex; flex-wrap: wrap; align-content: start; gap: 10px; }
.method-map { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.method-card.wide { grid-column: span 2; }
.branch-flow { display: grid; grid-template-columns: repeat(5, 1fr); gap: 12px; }
.branch-flow span { padding: 22px 14px; text-align: center; border-radius: 8px; background: var(--paper); border: 1px solid var(--line); font-family: "SFMono-Regular", Consolas, ui-monospace, monospace; font-size: 13px; }
.branch-flow .confirmed { border-color: var(--success); } .branch-flow .pending { border-color: var(--pending); } .branch-flow .failed { border-color: var(--failed); } .branch-flow .refunded { border-color: var(--blue); }
.faq-list { display: grid; gap: 12px; }
details { background: var(--paper); border: 1px solid var(--line); border-radius: 8px; padding: 18px 20px; }
summary { cursor: pointer; font-weight: 800; }
.contact-layout { display: grid; grid-template-columns: minmax(0, 1fr) 330px; gap: 28px; padding: 40px 0 70px; }
.contact-form { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; background: var(--paper); border: 1px solid var(--line); border-radius: 8px; padding: 24px; }
label { display: grid; gap: 8px; font-weight: 760; color: #354246; }
input, textarea { width: 100%; border: 1px solid #c9d2cd; border-radius: 6px; padding: 12px 13px; background: white; color: var(--graphite); font: inherit; }
.full { grid-column: 1 / -1; }
.form-note, .form-status { margin: 0; }
.contact-aside, .legal { background: var(--paper); border: 1px solid var(--line); border-radius: 8px; padding: 26px; }
.legal { margin-top: 38px; margin-bottom: 70px; }
.final-cta { width: min(1180px, calc(100% - 36px)); margin: 36px auto 70px; padding: 40px; background: var(--graphite); color: white; border-radius: 8px; display: grid; grid-template-columns: 1fr auto; gap: 16px; align-items: center; }
.final-cta p { color: #d8e2df; margin: 0; }
.site-footer { background: #11191c; color: white; padding: 40px clamp(18px, 5vw, 70px); display: grid; grid-template-columns: 1.2fr 1fr; gap: 32px; }
.site-footer p { color: #c8d1cf; }
.site-footer nav { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px 18px; }
.site-footer a { color: white; text-decoration: none; }
.fineprint { grid-column: 1 / -1; font-size: 13px; border-top: 1px solid rgba(255,255,255,.14); padding-top: 18px; }

@media (prefers-reduced-motion: reduce) {
  *, *:before, *:after { animation: none !important; scroll-behavior: auto !important; }
}
@media (max-width: 960px) {
  .site-header { grid-template-columns: auto auto; }
  .menu-toggle { display: inline-flex; justify-self: end; min-height: 40px; align-items: center; border: 1px solid var(--line); background: var(--paper); border-radius: 6px; padding: 0 12px; }
  .site-nav, .header-cta { display: none; }
  .site-nav.open { display: grid; grid-column: 1 / -1; justify-content: stretch; gap: 0; }
  .site-nav.open a { padding: 12px 0; border-top: 1px solid var(--line); }
  .split-hero, .state-board, .two-col, .contact-layout, .site-footer, .final-cta { grid-template-columns: 1fr; }
  .ops-visual { min-height: 460px; }
  .flow-rail, .module-grid, .module-grid.uneven, .scenario-grid, .faq-grid, .state-explain, .method-map, .branch-flow, .check-grid { grid-template-columns: 1fr 1fr; }
  .comparison-table { grid-template-columns: 1fr; }
  .comparison-table .head { display: none; }
  .method-card.wide { grid-column: auto; }
}
@media (max-width: 620px) {
  h1 { font-size: 40px; }
  .hero, .sub-hero, .section, .contact-layout, .legal, .cap-strip, .state-board, .final-cta { width: min(100% - 28px, 1180px); }
  .split-hero { padding-top: 48px; }
  .ops-visual { min-height: 560px; }
  .visual-node { width: calc(100% - 44px); left: 22px !important; right: auto !important; }
  .request { top: 24px; } .route { top: 126px; } .status { top: 228px; } .order { bottom: 126px; } .event { bottom: 24px; }
  .moving-dot { display: none; }
  .flow-rail, .module-grid, .module-grid.uneven, .scenario-grid, .faq-grid, .state-explain, .method-map, .branch-flow, .check-grid, .contact-form { grid-template-columns: 1fr; }
  .flow-rail div { border-right: 0; border-bottom: 1px solid var(--line); min-height: 110px; }
  .state-board, .final-cta { padding: 28px; }
  .event-list code { transform: none; }
}