:root { --ink: #24352e; --muted: #728079; --green: #27845c; --blue: #4385b9; --line: #dde7e0; --wash: #f4f8f5; }
* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 20px; }
body { margin: 0; min-width: 280px; color: var(--ink); background: #fff; font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif; font-size: 16px; line-height: 1.6; }
button, a { -webkit-tap-highlight-color: transparent; }
button { font: inherit; }
a { color: inherit; text-decoration: none; }
img { display: block; object-fit: contain; flex-shrink: 0; }
h1, h2, h3, p { margin: 0; }
button:focus-visible, a:focus-visible { outline: 2px solid var(--green); outline-offset: 5px; }
[hidden] { display: none !important; }
.container { width: min(1080px, calc(100% - 64px)); margin-inline: auto; }
.site-header { border-bottom: 1px solid #e8eee9; }
.header-inner { display: flex; align-items: center; justify-content: space-between; gap: 24px; min-height: 78px; }
.brand { display: inline-flex; align-items: center; gap: 12px; font-size: 23px; font-weight: 650; white-space: nowrap; }
.header-inner nav { display: flex; flex-wrap: wrap; gap: 28px; font-size: 14px; color: #65786b; }
.header-inner nav a { padding-block: 8px; transition: color .18s; }
.header-inner nav a:hover { color: var(--green); }
.introduction { padding-top: 30px; padding-bottom: 30px; }
.eyebrow { color: #718879; font-size: 13px; line-height: 1.8; }
h1 { margin-top: 6px; color: #234d38; font-size: 42px; font-weight: 650; line-height: 1.3; }
.intro-title { margin-top: 10px; font-size: 29px; font-weight: 500; line-height: 1.5; }
.intro-description { margin-top: 8px; color: var(--muted); font-size: 16px; }
.modules { padding-bottom: 24px; }
.module-tabs { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.module-tab { position: relative; display: grid; grid-template-columns: 32px minmax(0, 1fr); column-gap: 13px; row-gap: 2px; align-items: center; min-width: 0; min-height: 90px; margin: 0; padding: 15px 22px; border: 0; background: transparent; text-align: left; color: #506258; cursor: pointer; transition: background .18s; }
.module-tab img { grid-row: span 2; }
.module-tab span { font-size: 18px; line-height: 1.5; }
.module-tab small { font-size: 12px; line-height: 1.5; color: #819087; }
.module-tab + .module-tab::before { content: ''; position: absolute; left: 0; top: 28px; bottom: 28px; width: 1px; background: #e1e9e4; }
.module-tab[aria-selected="true"] { color: #237c51; background: #f3f8f4; }
.module-tab[aria-selected="true"]::after { content: ''; position: absolute; height: 3px; left: 22px; right: 22px; bottom: -1px; background: #3b986a; }
.module-tab:hover { background: #f3f7f4; }
.module-panel { padding: 28px 0 14px; min-height: 398px; animation: panel-enter .2s ease-out; }
.module-panel:focus-visible { outline: 2px solid #9cc2ab; outline-offset: 6px; }
.panel-heading { display: flex; align-items: flex-start; justify-content: space-between; gap: 24px; margin-bottom: 22px; }
.panel-heading h2 { font-size: 23px; line-height: 1.5; font-weight: 600; }
.panel-heading p { margin-top: 5px; font-size: 15px; color: var(--muted); }
.diagram-caption { flex-shrink: 0; color: #98a49d; font-size: 12px; padding-top: 6px; }
.home-map { max-width: 820px; margin: 0 auto; }
.business-sources { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 32px; }
.flow-lane { padding: 12px 18px 15px; background: #f5f9f6; border-left: 2px solid #b7d2bf; }
.flow-lane.cash { background: #f3f7fc; border-left-color: #b8d0e3; }
.flow-lane h3 { color: #6a8272; font-size: 13px; font-weight: 400; }
.flow-lane.cash h3 { color: #6a8095; }
.icon-pair { display: flex; align-items: center; justify-content: space-around; gap: 16px; margin-top: 12px; }
.icon-label { display: flex; align-items: center; justify-content: center; gap: 12px; min-width: 0; }
.icon-label span { color: #3d5b48; font-size: 16px; overflow-wrap: anywhere; }
.pair-divider { height: 24px; width: 1px; background: #dbe5de; }
.join-line { position: relative; height: 24px; width: 50%; margin: 0 auto 16px; border-bottom: 1px solid #cbded0; border-left: 1px solid #cbded0; border-right: 1px solid #cbded0; }
.join-line::after { content: ''; position: absolute; left: 50%; top: 100%; height: 16px; border-left: 1px solid #cbded0; }
.map-center { display: flex; align-items: center; justify-content: center; gap: 20px; padding: 16px 20px; background: #eef6f0; }
.map-center h3 { color: #375a43; font-size: 18px; font-weight: 550; }
.map-center p { margin-top: 3px; color: #768c7b; font-size: 14px; }
.map-destinations { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); margin-top: 18px; }
.map-destinations > div { display: flex; align-items: center; justify-content: center; gap: 14px; padding: 9px; color: #54705e; font-size: 15px; }
.map-destinations > div + div { border-left: 1px solid #e0e9e2; }
.ledger-sources { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); max-width: 820px; margin: 0 auto; padding-top: 5px; }
.ledger-sources + .join-line { width: 75%; max-width: 615px; }
.blue-center { max-width: 820px; margin: auto; background: #f0f6fc; }
.blue-center h3 { color: #45647f; }
.blue-center p { color: #7d91a3; }
.detail-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 18px; max-width: 900px; margin: 24px auto 0; }
.detail-grid > div { display: flex; align-items: center; gap: 14px; padding: 12px 0; border-top: 1px solid #e3eaf1; }
.detail-grid span { font-size: 15px; color: #486077; }
.detail-grid small { display: block; color: #83929e; font-size: 13px; margin-top: 3px; }
.entry-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 38px; }
.entry-lane { padding: 15px 20px; border-top: 2px solid #c8dccd; background: #f7faf8; }
.entry-lane + .entry-lane { border-color: #c8d8e8; background: #f5f8fc; }
.entry-lane h3 { font-size: 16px; font-weight: 550; color: #45614e; }
.entry-lane .icon-pair { margin-top: 22px; }
.entry-lane > p { margin-top: 20px; font-size: 15px; color: #5a7063; text-align: center; }
.entry-lane small { display: block; margin-top: 4px; font-size: 13px; color: #829187; }
.dismantle-note { display: flex; align-items: center; gap: 17px; padding: 18px 0 0; margin-top: 18px; border-top: 1px solid #e8e2ef; }
.dismantle-note h3 { color: #75648b; font-size: 16px; font-weight: 500; }
.dismantle-note p { margin-top: 3px; color: #8c8198; font-size: 14px; }
.profit-equation { display: grid; grid-template-columns: minmax(0, 1fr) 24px minmax(0, 1fr) 24px minmax(0, 1.2fr); align-items: center; gap: 16px; margin-top: 8px; }
.profit-source, .profit-result { text-align: center; min-width: 0; padding: 22px 8px; }
.profit-source { border-top: 1px solid #d8e4dc; border-bottom: 1px solid #d8e4dc; }
.profit-source img, .profit-result img { margin: 0 auto 12px; }
.profit-equation h3 { font-size: 18px; color: #41634e; font-weight: 550; }
.profit-equation p { margin-top: 5px; font-size: 14px; color: #819287; }
.profit-result { background: #f0f7f2; }
.equation-sign { font-size: 26px; color: #a1b4a6; text-align: center; }
.analysis-outputs { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 28px; margin-top: 26px; }
.analysis-outputs > div { border-top: 1px solid #dce7df; padding-top: 12px; }
.analysis-outputs span { color: #92ac9a; font-size: 12px; }
.analysis-outputs h3 { margin-top: 4px; font-size: 16px; font-weight: 500; color: #476151; }
.analysis-outputs p { margin-top: 4px; font-size: 14px; color: #85928a; }
.account-center { max-width: 640px; margin: 18px auto 0; }
.settings-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 22px; margin-top: 26px; }
.settings-grid > div { padding: 18px 10px; text-align: center; border-top: 1px solid #e0e8e2; }
.settings-grid img { margin: 0 auto 12px; }
.settings-grid h3 { color: #4c6756; font-size: 16px; font-weight: 500; }
.settings-grid p { color: #86948b; font-size: 14px; margin-top: 5px; }
.workflow-section { padding: 36px 0 40px; background: #f5f8f6; border-block: 1px solid #e5ece7; }
.section-heading h2 { font-size: 25px; font-weight: 550; margin-top: 7px; line-height: 1.5; }
.workflow-list { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 30px; list-style: none; margin: 30px 0 0; padding: 0; }
.workflow-list li { position: relative; padding-top: 14px; border-top: 1px solid #d2e0d6; }
.step-number { position: absolute; right: 0; top: 16px; color: #9bae9e; font-size: 13px; }
.workflow-list h3 { margin-top: 13px; font-size: 18px; font-weight: 550; color: #3f5c48; }
.workflow-list p { max-width: 210px; margin-top: 6px; font-size: 14px; color: #7a8d80; }
.industries-section { padding-block: 38px 42px; }
.industry-list { display: grid; grid-template-columns: repeat(6, minmax(0, 1fr)); gap: 20px; list-style: none; margin: 26px 0 0; padding: 0; }
.industry-list li { border-bottom: 1px solid #d8e5dd; padding: 12px 0; font-size: 16px; color: #577060; }
.industry-note { margin-top: 18px; color: #89978d; font-size: 13px; }
.site-footer { border-top: 1px solid #e6ece8; }
.footer-inner { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 12px 24px; padding-block: 22px; font-size: 12px; color: #88958c; }
.site-footer a:hover { color: var(--green); text-decoration: underline; }
@keyframes panel-enter { from { opacity: .5; transform: translateY(3px); } to { opacity: 1; transform: none; } }
@media (max-width: 860px) {
  .container { width: calc(100% - 40px); }
  .module-tab { padding: 14px 12px; column-gap: 9px; }
  .module-tab small { font-size: 11px; }
  .business-sources { gap: 20px; }
  .icon-pair { gap: 8px; }
  .icon-label { flex-direction: column; gap: 8px; text-align: center; }
  .flow-lane { padding-inline: 12px; }
  .detail-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 8px 22px; }
  .profit-equation { gap: 10px; }
  .profit-equation h3 { font-size: 16px; }
  .profit-equation p { font-size: 13px; }
  .workflow-list { gap: 20px; }
  .industry-list { grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 8px 24px; }
}
@media (max-width: 560px) {
  .container { width: calc(100% - 32px); }
  .header-inner { min-height: 68px; gap: 12px; }
  .brand { font-size: 20px; gap: 8px; }
  .brand img { width: 28px; height: 28px; }
  .header-inner nav { gap: 12px; font-size: 12px; }
  .introduction { padding-top: 24px; padding-bottom: 26px; }
  h1 { font-size: 34px; }
  .intro-title { font-size: 24px; }
  .intro-description { font-size: 14px; }
  .module-tab { display: flex; flex-direction: column; justify-content: center; gap: 6px; min-height: 82px; padding: 12px 4px; text-align: center; }
  .module-tab img { width: 28px; height: 28px; }
  .module-tab span { font-size: 15px; }
  .module-tab small { display: none; }
  .module-tab + .module-tab::before { top: 26px; bottom: 26px; }
  .module-tab[aria-selected="true"]::after { left: 12px; right: 12px; }
  .module-panel { padding-top: 22px; min-height: 0; }
  .panel-heading { gap: 8px; margin-bottom: 18px; }
  .panel-heading h2 { font-size: 20px; }
  .panel-heading p { font-size: 14px; }
  .diagram-caption { font-size: 11px; }
  .business-sources { gap: 14px; }
  .icon-label img { width: 38px; height: 38px; }
  .icon-label span { font-size: 13px; }
  .flow-lane { padding: 10px 7px 12px; }
  .flow-lane h3 { font-size: 12px; }
  .icon-pair { gap: 6px; }
  .map-center { padding: 15px 12px; gap: 14px; }
  .map-center h3 { font-size: 17px; }
  .map-center p { font-size: 12px; }
  .map-destinations { margin-top: 14px; }
  .map-destinations > div { flex-direction: column; gap: 8px; padding: 8px 4px; font-size: 13px; }
  .map-destinations img { width: 30px; height: 30px; }
  .detail-grid { gap: 6px 14px; margin-top: 16px; }
  .detail-grid > div { gap: 10px; }
  .detail-grid span { font-size: 14px; }
  .detail-grid small { font-size: 12px; }
  .entry-grid { gap: 14px; }
  .entry-lane { padding: 12px 8px; }
  .entry-lane h3 { font-size: 15px; }
  .entry-lane > p { font-size: 13px; }
  .entry-lane small { font-size: 12px; }
  .dismantle-note { align-items: flex-start; }
  .dismantle-note p { font-size: 13px; }
  .profit-equation { grid-template-columns: minmax(0, 1fr) 16px minmax(0, 1fr); gap: 8px; }
  .profit-source { padding: 18px 5px; }
  .profit-equation > .equation-sign:nth-of-type(2) { grid-column: 1 / -1; line-height: 1; }
  .profit-result { grid-column: 1 / -1; padding: 16px; }
  .analysis-outputs { gap: 12px; margin-top: 18px; }
  .analysis-outputs h3 { font-size: 14px; }
  .analysis-outputs p { font-size: 12px; }
  .settings-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 8px 20px; margin-top: 18px; }
  .settings-grid > div { padding-block: 14px; }
  .settings-grid h3 { font-size: 15px; }
  .settings-grid p { font-size: 13px; }
  .workflow-section { padding-block: 26px 30px; }
  .section-heading h2 { font-size: 21px; }
  .workflow-list { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 24px; margin-top: 22px; }
  .workflow-list h3 { font-size: 17px; }
  .workflow-list p { font-size: 13px; }
  .industries-section { padding-block: 28px; }
  .industry-list { gap: 6px 18px; margin-top: 18px; }
  .industry-list li { font-size: 14px; }
  .footer-inner { justify-content: flex-start; gap: 8px 20px; padding-block: 18px; }
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } *, *::before, *::after { animation: none !important; transition: none !important; } }