:root {
  color-scheme: light;
  --canvas: #f5f7f2;
  --surface: #ffffff;
  --ink: #18392e;
  --muted: #52665c;
  --accent: #08735a;
  --mint: #e3efe6;
  --line: #d4dfd6;
  --dark: #183d31;
  --on-dark: #f3f8f0;
  --muted-dark: #c3d9cc;
  --max-width: 1240px;
  --ease: cubic-bezier(.2, .7, .2, 1);
  font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
  color: var(--ink);
  background: var(--canvas);
  font-synthesis: none;
  -webkit-font-smoothing: antialiased;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 104px; }
body { margin: 0; }
button, a { -webkit-tap-highlight-color: transparent; }
button { font: inherit; }
a { color: inherit; text-decoration: none; }
button, a { touch-action: manipulation; }
button { cursor: pointer; }
[hidden] { display: none !important; }
p, h1, h2, h3, figure { margin: 0; }
h1, h2, h3 { font-weight: 600; }
p { text-wrap: pretty; }
svg { display: block; }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 5px; }
:target { scroll-margin-top: 16px; }
main:focus, section:focus { outline: none; }
.wrap { width: min(var(--max-width), calc(100% - 128px)); margin-inline: auto; }
.skip-link { position: fixed; top: 10px; left: 24px; padding: 12px 20px; background: var(--ink); color: white; z-index: 100; transform: translateY(-160%); }
.skip-link:focus { transform: translateY(0); }

.site-header { position: sticky; top: 0; z-index: 20; background: var(--canvas); border-bottom: 1px solid var(--line); }
.header-inner { min-height: 88px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand { display: inline-flex; align-items: center; gap: 16px; min-height: 48px; }
.wordmark { font-size: 29px; font-weight: 650; letter-spacing: -.04em; }
.brand-period { color: var(--accent); margin-left: 2px; }
.brand-description { color: var(--muted); font-size: 13px; border-left: 1px solid #b5c6b9; padding-left: 16px; }
.site-nav { display: flex; align-items: center; gap: 36px; }
.site-nav a { color: var(--muted); font-size: 14px; display: inline-flex; align-items: center; min-height: 48px; transition: color 160ms var(--ease); }
.site-nav a:hover, .site-nav a:focus-visible { color: var(--accent); }
.menu-toggle { display: none; }

.hero { display: grid; grid-template-columns: 1.16fr 1fr; align-items: center; gap: 20px; padding-block: 76px 88px; }
.hero-audience { display: inline-flex; align-items: center; gap: 12px; color: var(--accent); font-size: 15px; margin-bottom: 26px; }
.hero-audience::before { content: ""; display: block; width: 24px; height: 1px; background: var(--accent); }
h1 { font-size: clamp(42px, 4.65vw, 70px); line-height: 1.28; letter-spacing: -.045em; }
h1 span { color: var(--accent); }
.hero-description { max-width: 490px; margin-top: 28px; font-size: 17px; line-height: 1.95; color: var(--muted); }
.primary-link { display: inline-flex; align-items: center; justify-content: center; gap: 26px; min-height: 54px; padding: 14px 26px; border-radius: 30px; background: var(--ink); color: white; margin-top: 32px; font-size: 15px; transition: background-color 180ms var(--ease), transform 180ms var(--ease); }
.primary-link svg { width: 22px; height: 22px; fill: none; stroke: currentColor; stroke-width: 1.5; }
.primary-link:active { transform: translateY(1px); }
.hero-company { margin-top: 32px; color: var(--muted); font-size: 13px; }
.hero-system { min-width: 0; }
.system-map { position: relative; width: 100%; aspect-ratio: 1; }
.system-lines { position: absolute; inset: 0; width: 100%; height: 100%; color: #6c9d82; }
.system-disc { fill: var(--mint); }
.system-ring { stroke: #b9cebe; stroke-width: 1; fill: none; }
.system-inner-ring { stroke: #d4dfd6; stroke-width: 1; stroke-dasharray: 3 7; fill: none; }
.system-spoke { fill: none; stroke: #aec8b7; stroke-width: 1; }
.system-flow { stroke: #6c9d82; stroke-width: 1.5; fill: none; }
.system-core { position: absolute; inset: 50% auto auto 50%; transform: translate(-50%, -50%); display: flex; align-items: center; justify-content: center; flex-direction: column; width: 34%; aspect-ratio: 1; border-radius: 50%; background: var(--canvas); border: 1px solid #bfd2c3; }
.core-mark { font-size: clamp(25px, 2.9vw, 42px); font-weight: 600; letter-spacing: .1em; padding-left: .1em; }
.core-label { font-size: 13px; margin-top: 9px; color: var(--muted); }
.system-nodes { margin: 0; padding: 0; list-style: none; }
.system-nodes li { position: absolute; transform: translate(-50%, -50%); text-align: center; display: flex; flex-direction: column; gap: 5px; width: 112px; padding-block: 8px; font-size: 15px; font-weight: 500; line-height: 1.4; background: var(--canvas); }
.system-nodes li span { font-size: 11px; color: var(--accent); font-variant-numeric: tabular-nums; }
.node-1 { left: 50%; top: 9%; }
.node-2 { left: 85%; top: 29.5%; }
.node-3 { left: 85%; top: 70.5%; }
.node-4 { left: 50%; top: 91%; }
.node-5 { left: 15%; top: 70.5%; }
.node-6 { left: 15%; top: 29.5%; }
.hero-system figcaption { margin-top: 10px; display: flex; align-items: center; justify-content: center; flex-wrap: wrap; gap: 8px; color: var(--muted); font-size: 13px; line-height: 1.8; }
.caption-line { width: 18px; height: 1px; background: #6c9d82; }
.concept-label { border-left: 1px solid #bfd2c3; padding-left: 8px; }

.vision-section { padding-block: 84px 96px; border-top: 1px solid var(--line); }
.section-label { color: var(--accent); font-size: 14px; margin-bottom: 24px; }
h2 { font-size: clamp(30px, 3vw, 43px); line-height: 1.5; letter-spacing: -.035em; }
.vision-intro { display: grid; grid-template-columns: 1.2fr .8fr; column-gap: 100px; }
.vision-intro .section-label { grid-column: 1 / -1; }
.vision-intro h2 span { color: var(--accent); }
.vision-intro > p:last-child { align-self: end; color: var(--muted); font-size: 17px; line-height: 1.9; padding-bottom: 8px; }
.value-pair { display: grid; grid-template-columns: 1fr 1fr; gap: 80px; margin-top: 52px; }
.value-item { border-top: 1px solid #b8c9bc; padding-top: 28px; position: relative; }
.value-index { color: var(--accent); font-size: 12px; display: block; margin-bottom: 20px; }
.value-item h3 { font-size: 24px; margin-bottom: 16px; }
.value-item p { font-size: 16px; line-height: 1.95; color: var(--muted); max-width: 490px; }
.value-summary { display: block; font-size: 14px; margin-top: 24px; color: var(--ink); }

.cycle-section { background: var(--dark); color: var(--on-dark); padding-block: 88px 48px; }
.cycle-heading { display: grid; grid-template-columns: 1.25fr .75fr; gap: 60px; align-items: end; }
.cycle-heading .section-label { color: #b1dfc1; }
.cycle-heading h2 { font-size: clamp(30px, 3.15vw, 45px); line-height: 1.5; }
.cycle-heading > p { font-size: 16px; line-height: 1.95; color: var(--muted-dark); padding-bottom: 8px; }
.cycle-instruction { color: var(--muted-dark); font-size: 14px; margin-top: 32px; }
.cycle-explorer { display: grid; grid-template-columns: .85fr 1.15fr; margin-top: 54px; border-top: 1px solid #537464; }
.has-js .cycle-explorer { margin-top: 16px; }
.cycle-step[aria-pressed="true"] .step-arrow { display: block; font-size: 16px; }
.cycle-controls { display: none; padding: 20px 40px 20px 0; border-right: 1px solid #537464; }
.has-js .cycle-controls { display: grid; }
.cycle-step { width: 100%; color: var(--muted-dark); background: transparent; border: 0; border-radius: 4px; text-align: left; padding: 16px 18px; display: flex; align-items: center; gap: 24px; font-size: 17px; min-height: 58px; transition: color 160ms var(--ease), background-color 160ms var(--ease); }
.step-number { font-size: 12px; font-variant-numeric: tabular-nums; }
.step-arrow { margin-left: auto; }
.step-arrow svg { width: 16px; height: 16px; fill: none; stroke: currentColor; stroke-width: 1.5; stroke-linecap: round; stroke-linejoin: round; }
.cycle-step[aria-pressed="true"] { background: #e0eddf; color: var(--dark); }
.cycle-step:focus-visible { outline-color: #b1dfc1; outline-offset: 2px; }
.cycle-detail { display: none; min-width: 0; padding: 48px 0 36px 60px; align-self: center; }
.has-js .cycle-detail { display: block; }
.detail-kicker { color: var(--muted-dark); font-size: 14px; }
.cycle-detail h3 { font-size: clamp(25px, 2.7vw, 36px); line-height: 1.55; margin-top: 20px; letter-spacing: -.025em; }
.cycle-detail p { color: var(--muted-dark); font-size: 16px; line-height: 1.95; max-width: 520px; margin-top: 22px; }
.detail-flow { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 32px; align-items: center; font-size: 13px; color: var(--muted-dark); }
.detail-flow strong { font-weight: 500; color: var(--on-dark); border-bottom: 1px solid #8abfa1; padding-bottom: 5px; }
.cycle-disclaimer { border-top: 1px solid #537464; padding-top: 24px; margin-top: 20px; max-width: 100%; font-size: 13px; color: var(--muted-dark); line-height: 1.9; }
.cycle-fallback { padding-block: 24px; }
.cycle-fallback h3 { font-size: 23px; margin-bottom: 16px; }
.cycle-fallback ol { padding-left: 24px; color: var(--muted-dark); font-size: 16px; line-height: 2; }

.applications-section { padding-block: 96px 88px; display: grid; grid-template-columns: 1fr 1fr; column-gap: 88px; }
.applications-intro { position: sticky; top: 136px; align-self: start; }
.applications-intro h2 { font-size: clamp(29px, 2.8vw, 40px); }
.applications-intro > p:last-child { font-size: 16px; line-height: 1.95; color: var(--muted); margin-top: 24px; max-width: 390px; }
.application-list { border-top: 1px solid #b8c9bc; }
.application-row { display: grid; grid-template-columns: 32px 1fr; gap: 24px; border-bottom: 1px solid var(--line); padding-block: 28px; }
.application-row svg { width: 28px; height: 28px; fill: none; stroke: var(--accent); stroke-width: 1.4; stroke-linecap: round; stroke-linejoin: round; margin-top: 2px; }
.application-row h3 { font-size: 20px; margin-bottom: 12px; }
.application-row p { font-size: 16px; color: var(--muted); line-height: 1.9; }
.applications-note { grid-column: 2; margin-top: 20px; font-size: 13px; color: var(--muted); line-height: 1.9; }
.closing-section { border-top: 1px solid var(--line); padding-block: 54px; display: flex; align-items: center; gap: 48px; }
.closing-brand { font-size: 28px; font-weight: 600; letter-spacing: .04em; }
.closing-section p { line-height: 1.85; font-size: 18px; }
.closing-section p span { color: var(--muted); }
.back-top { margin-left: auto; display: inline-flex; align-items: center; gap: 12px; min-height: 48px; font-size: 14px; }
.back-top span { font-size: 20px; color: var(--accent); }
.site-footer { border-top: 1px solid var(--line); }
.footer-inner { display: flex; gap: 24px; justify-content: space-between; align-items: center; padding-block: 32px; }
.footer-company { font-size: 14px; }
.copyright { color: var(--muted); font-size: 12px; margin-top: 10px; line-height: 1.8; }
.icp-link { display: inline-flex; align-items: center; gap: 10px; font-size: 13px; color: var(--muted); min-height: 44px; }
.icp-link:hover { text-decoration: underline; text-underline-offset: 4px; }

@media (hover: hover) and (pointer: fine) {
  .primary-link:hover { background: var(--accent); transform: translateY(-2px); }
  .cycle-step:hover:not([aria-pressed="true"]) { background: #234b3c; color: var(--on-dark); }
  .back-top:hover { color: var(--accent); }
}

@media (min-width: 1600px) {
  .hero { gap: 48px; }
}

@media (max-width: 1100px) {
  .wrap { width: calc(100% - 80px); }
  .hero { gap: 12px; padding-block: 64px; }
  h1 { font-size: clamp(40px, 4.55vw, 52px); }
  .hero-description { font-size: 16px; }
  .hero-company { font-size: 13px; }
  .system-nodes li { width: 90px; font-size: 14px; }
  .vision-intro { column-gap: 40px; }
  .value-pair { gap: 48px; }
  .cycle-heading { grid-template-columns: 1.2fr .8fr; gap: 32px; }
  .cycle-controls { padding-right: 24px; }
  .cycle-detail { padding-left: 36px; }
  .applications-section { column-gap: 48px; }
}

@media (max-width: 820px) {
  .header-inner { min-height: 76px; }
  .site-nav { gap: 24px; }
  .brand-description { display: none; }
  .hero { grid-template-columns: 1fr; padding-block: 56px 48px; gap: 36px; }
  h1 { font-size: clamp(40px, 6.7vw, 62px); }
  .hero-description { max-width: 580px; }
  .hero-system { width: min(480px, 100%); justify-self: center; }
  .core-mark { font-size: 36px; }
  .hero-company { margin-top: 24px; }
  .vision-section { padding-block: 64px; }
  .vision-intro { grid-template-columns: 1fr; }
  .vision-intro > p:last-child { margin-top: 24px; }
  .value-pair { gap: 36px; margin-top: 36px; }
  .value-item h3 { font-size: 21px; }
  .value-item p { font-size: 16px; }
  .cycle-section { padding-block: 64px 36px; }
  .cycle-heading { grid-template-columns: 1fr; gap: 24px; }
  .cycle-explorer { grid-template-columns: 1fr; margin-top: 32px; }
  .cycle-controls { padding: 24px 0; border-right: 0; border-bottom: 1px solid #537464; }
  .has-js .cycle-controls { grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 8px; }
  .cycle-step { font-size: 15px; padding: 12px; gap: 12px; }
  .step-arrow { display: none; }
  .cycle-detail { padding: 32px 0 24px; min-height: 290px; }
  .cycle-detail h3 { font-size: 31px; }
  .applications-section { padding-block: 64px; column-gap: 40px; grid-template-columns: .9fr 1.1fr; }
  .applications-intro { position: static; }
  .application-row { gap: 16px; }
}

@media (max-width: 600px) {
  html { scroll-padding-top: 90px; }
  .wrap { width: calc(100% - 48px); }
  .header-inner { min-height: 72px; gap: 16px; flex-wrap: wrap; }
  .wordmark { font-size: 27px; }
  .brand { gap: 10px; }
  .site-nav { width: 100%; padding-bottom: 16px; justify-content: space-between; gap: 12px; }
  .site-nav a { font-size: 13px; }
  .has-js .site-nav { display: none; position: absolute; top: 100%; left: 0; padding: 12px 24px 20px; background: var(--canvas); border-bottom: 1px solid var(--line); flex-direction: column; align-items: stretch; gap: 4px; }
  .has-js .site-nav.is-open { display: flex; }
  .has-js .site-nav a { padding-inline: 8px; font-size: 15px; }
  .menu-toggle { background: transparent; border: 0; color: var(--ink); min-height: 44px; min-width: 74px; display: inline-flex; align-items: center; justify-content: flex-end; gap: 12px; padding: 0 2px; }
  .menu-label { font-size: 13px; }
  .menu-icon { width: 20px; height: 16px; position: relative; }
  .menu-icon i { height: 1.5px; width: 20px; position: absolute; left: 0; background: currentColor; transition: transform 180ms var(--ease); }
  .menu-icon i:first-child { top: 4px; }
  .menu-icon i:last-child { top: 11px; }
  .menu-toggle[aria-expanded="true"] .menu-icon i:first-child { transform: translateY(3.5px) rotate(45deg); }
  .menu-toggle[aria-expanded="true"] .menu-icon i:last-child { transform: translateY(-3.5px) rotate(-45deg); }
  .hero { padding-block: 40px 44px; gap: 36px; }
  .hero-audience { font-size: 13px; gap: 8px; margin-bottom: 20px; }
  .hero-audience::before { width: 16px; }
  h1 { font-size: clamp(34px, 8.9vw, 49px); line-height: 1.4; letter-spacing: -.055em; }
  .hero-description { margin-top: 22px; font-size: 16px; line-height: 1.95; }
  .primary-link { margin-top: 26px; min-height: 52px; padding-inline: 24px; font-size: 14px; }
  .hero-company { margin-top: 24px; font-size: 13px; line-height: 1.8; }
  .system-map { max-width: 400px; margin-inline: auto; }
  .system-nodes li { font-size: 14px; width: 86px; gap: 4px; }
  .core-mark { font-size: 28px; }
  .core-label { font-size: 13px; margin-top: 7px; }
  .hero-system figcaption { font-size: 13px; gap: 6px; }
  .caption-line { display: none; }
  .vision-section { padding-block: 48px 56px; }
  .section-label { margin-bottom: 18px; font-size: 13px; }
  h2 { font-size: 28px; line-height: 1.6; }
  .vision-intro > p:last-child { font-size: 16px; margin-top: 22px; }
  .desktop-break { display: none; }
  .value-pair { grid-template-columns: 1fr; gap: 32px; margin-top: 32px; }
  .value-item { padding-top: 24px; }
  .value-index { margin-bottom: 14px; }
  .value-item h3 { font-size: 22px; }
  .value-item p { font-size: 16px; }
  .value-summary { font-size: 13px; margin-top: 18px; }
  .cycle-section { padding-block: 48px 32px; }
  .cycle-heading h2 { font-size: 28px; }
  .cycle-heading > p { font-size: 16px; }
  .has-js .cycle-controls { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .cycle-step { min-height: 50px; font-size: 14px; gap: 12px; }
  .cycle-detail { min-height: 330px; }
  .cycle-detail h3 { font-size: 27px; }
  .cycle-detail p { font-size: 16px; }
  .detail-flow { font-size: 12px; gap: 10px; }
  .cycle-disclaimer { font-size: 13px; }
  .applications-section { padding-block: 56px; display: block; }
  .applications-intro h2 { font-size: 28px; }
  .applications-intro > p:last-child { font-size: 16px; margin-top: 20px; }
  .application-list { margin-top: 32px; }
  .application-row { padding-block: 24px; gap: 18px; }
  .application-row h3 { font-size: 19px; }
  .application-row p { font-size: 16px; }
  .applications-note { font-size: 13px; }
  .closing-section { padding-block: 32px; gap: 20px; flex-wrap: wrap; }
  .closing-brand { font-size: 25px; }
  .closing-section p { font-size: 15px; }
  .back-top { font-size: 13px; }
  .footer-inner { display: block; padding-block: 28px; }
  .footer-company { font-size: 13px; line-height: 1.8; }
  .copyright { font-size: 12px; }
  .icp-link { margin-top: 12px; font-size: 13px; }
}

@media (max-width: 359px) {
  .hero-audience { font-size: 12px; }
  h1 { font-size: 31px; }
  .core-mark { font-size: 24px; }
  .system-nodes li { width: 74px; font-size: 14px; }
  .system-nodes li span { font-size: 11px; }
  .cycle-step { gap: 8px; padding-inline: 10px; }
  h2, .cycle-heading h2, .applications-intro h2 { font-size: 25px; }
}

@media (forced-colors: active) {
  :focus-visible { outline-color: Highlight; }
  .cycle-step[aria-pressed="true"] { outline: 2px solid Highlight; outline-offset: -2px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
  .primary-link:hover { transform: none; }
}