:root {
  color-scheme: light;
  --paper: oklch(95% 0.018 85);
  --paper-deep: oklch(90% 0.028 82);
  --ink: oklch(27% 0.045 225);
  --ink-soft: oklch(42% 0.032 220);
  --ink-pale: oklch(72% 0.025 220);
  --seal: oklch(48% 0.135 34);
  --seal-deep: oklch(38% 0.11 34);
  --copper: oklch(67% 0.07 70);
  --line: oklch(79% 0.025 80);
  --surface-dark: oklch(24% 0.046 225);
  --surface-dark-raised: oklch(29% 0.042 225);
  --text-on-dark: oklch(91% 0.02 85);
  --text-on-dark-soft: oklch(76% 0.024 85);
  --display: "Songti SC", "STSong", "SimSun", serif;
  --body: "Microsoft YaHei", "PingFang SC", "Noto Sans CJK SC", sans-serif;
  --ease-out: cubic-bezier(.16, 1, .3, 1);
  --shell: min(1180px, calc(100vw - 40px));
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  min-width: 320px;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--body);
  font-size: 1rem;
  line-height: 1.7;
  font-kerning: normal;
  overflow-x: hidden;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  opacity: .38;
  background-image: linear-gradient(90deg, transparent 0, transparent calc(100% - 1px), var(--line) calc(100% - 1px));
  background-size: clamp(56px, 8vw, 112px) 100%;
}

a { color: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
button { font: inherit; }
.shell { width: var(--shell); margin-inline: auto; }
.skip-link { position: fixed; top: 8px; left: 8px; z-index: 500; padding: 10px 14px; background: var(--ink); color: var(--paper); transform: translateY(-150%); transition: transform 160ms var(--ease-out); }
.skip-link:focus { transform: translateY(0); }

.site-header {
  position: absolute;
  inset: 0 0 auto;
  z-index: 200;
  width: var(--shell);
  height: 96px;
  margin-inline: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--line);
}
.brand { display: inline-flex; align-items: center; gap: 12px; text-decoration: none; }
.brand-seal { display: grid; place-items: center; width: 40px; height: 40px; border: 1px solid var(--seal); color: var(--seal); font-family: var(--display); font-size: 1.35rem; transform: rotate(-3deg); }
.brand-copy { display: grid; gap: 0; }
.brand-copy strong { font-family: var(--display); font-size: 1.15rem; letter-spacing: .12em; }
.brand-copy small { font-size: .55rem; line-height: 1.3; letter-spacing: .12em; color: var(--ink-soft); }
.primary-nav { display: none; }
.primary-nav a { position: relative; padding: 12px 4px; color: var(--ink-soft); font-size: .875rem; text-decoration: none; }
.primary-nav a::after { content: ""; position: absolute; left: 4px; right: 100%; bottom: 6px; height: 1px; background: var(--seal); transition: right 240ms var(--ease-out); }
.nav-toggle { display: grid; justify-items: end; gap: 4px; min-width: 52px; min-height: 44px; border: 0; background: transparent; color: var(--ink); cursor: pointer; }
.nav-toggle-label { font-size: .75rem; letter-spacing: .12em; }
.nav-toggle-lines, .nav-toggle-lines::before { display: block; width: 24px; height: 1px; background: currentColor; transition: transform 240ms var(--ease-out); }
.nav-toggle-lines { position: relative; }
.nav-toggle-lines::before { content: ""; position: absolute; top: 6px; }
.nav-toggle[aria-expanded="true"] .nav-toggle-lines { transform: translateY(3px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-lines::before { transform: translateY(-6px) rotate(-90deg); }
.site-header.nav-open .primary-nav { display: grid; position: absolute; top: 84px; left: 0; right: 0; gap: 8px; padding: 20px; background: var(--paper); border: 1px solid var(--line); box-shadow: 0 18px 40px oklch(25% .03 225 / .12); }

.hero { position: relative; min-height: 780px; padding: 144px 0 48px; overflow: hidden; }
.hero::after { content: "千"; position: absolute; z-index: -1; top: 7%; right: -4%; font-family: var(--display); font-size: clamp(17rem, 42vw, 38rem); line-height: .8; color: oklch(88% .028 80); opacity: .72; }
.hero-grid { display: grid; gap: 56px; align-items: center; }
.eyebrow { display: flex; flex-wrap: wrap; gap: 8px 24px; margin: 0 0 28px; color: var(--seal-deep); font-size: .75rem; font-weight: 700; letter-spacing: .22em; }
.eyebrow span + span::before { content: "/"; margin-right: 24px; color: var(--copper); }
.hero h1 { max-width: 12ch; margin: 0; font-family: var(--display); font-size: clamp(3rem, 11vw, 7rem); font-weight: 600; line-height: 1.04; letter-spacing: -.045em; }
.hero h1 em { display: block; margin-top: .14em; color: var(--seal-deep); font-style: normal; }
.hero-lead { max-width: 36rem; margin: 32px 0 0; color: var(--ink-soft); font-size: 1.05rem; line-height: 1.95; }
.hero-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 16px 28px; margin-top: 36px; }
.primary-action { display: inline-flex; align-items: center; justify-content: space-between; gap: 28px; min-height: 52px; padding: 10px 18px; background: var(--ink); color: var(--paper); text-decoration: none; transition: background 140ms, transform 140ms; }
.text-action { min-height: 44px; display: inline-flex; align-items: center; text-underline-offset: 7px; text-decoration-color: var(--copper); }
.hero-ledger { position: relative; width: min(100%, 440px); margin-left: auto; padding: 24px; background: oklch(97% .014 85); border: 1px solid var(--line); box-shadow: 18px 18px 0 var(--paper-deep); transform: rotate(1.2deg); }
.ledger-heading { display: flex; justify-content: space-between; padding-bottom: 14px; border-bottom: 2px solid var(--ink); color: var(--ink-soft); font-size: .7rem; letter-spacing: .15em; }
.ledger-list { list-style: none; margin: 0; padding: 8px 0 0; }
.ledger-list li { display: grid; grid-template-columns: 38px 1fr; gap: 2px 12px; padding: 15px 0; border-bottom: 1px solid var(--line); }
.ledger-list li > span { grid-row: 1 / 3; color: var(--seal); font-family: var(--display); font-size: 1.2rem; }
.ledger-list strong { font-family: var(--display); font-size: 1.05rem; letter-spacing: .06em; }
.ledger-list small { color: var(--ink-soft); font-size: .75rem; }
.ledger-stamp { position: absolute; right: 24px; bottom: 28px; display: grid; place-items: center; width: 64px; height: 64px; border: 2px solid var(--seal); color: var(--seal); font-family: var(--display); letter-spacing: .08em; opacity: .72; transform: rotate(-11deg); }
.hero-index { display: flex; align-items: center; gap: 16px; margin-top: 80px; color: var(--ink-soft); font-size: .65rem; letter-spacing: .2em; }
.hero-index-line { flex: 1; height: 1px; background: var(--line); }

.section-kicker { margin: 0 0 24px; color: var(--seal-deep); font-size: .72rem; font-weight: 700; letter-spacing: .18em; }
.intro { padding-block: clamp(96px, 14vw, 180px); }
.intro-layout { display: grid; gap: 32px; }
.intro h2, .section-heading h2, .process h2, .principles h2, .questions h2, .closing h2 { margin: 0; font-family: var(--display); font-size: clamp(2.5rem, 7vw, 5.3rem); font-weight: 600; line-height: 1.12; letter-spacing: -.035em; }
.intro-layout > p { max-width: 35rem; margin: 0; color: var(--ink-soft); font-size: 1.08rem; line-height: 2; }

.section-dark { position: relative; padding-block: clamp(96px, 12vw, 156px); background: var(--surface-dark); color: var(--text-on-dark); }
.section-dark::before { content: ""; position: absolute; inset: 0; background: linear-gradient(90deg, transparent 49.8%, oklch(54% .028 225) 50%, transparent 50.2%); background-size: 25% 100%; opacity: .18; pointer-events: none; }
.section-dark .section-kicker { color: oklch(74% .08 63); }
.section-heading { position: relative; max-width: 820px; }
.service-list { position: relative; margin-top: 72px; border-top: 1px solid oklch(48% .035 225); }
.service-row { display: grid; grid-template-columns: 36px 1fr auto; gap: 8px 18px; align-items: start; padding: 28px 0; border-bottom: 1px solid oklch(48% .035 225); }
.service-number { color: var(--copper); font-family: var(--display); }
.service-row h3 { margin: 0; font-family: var(--display); font-size: 1.45rem; font-weight: 500; letter-spacing: .04em; }
.service-row p { grid-column: 2 / -1; max-width: 40rem; margin: 4px 0 0; color: var(--text-on-dark-soft); }
.service-tag { align-self: center; padding: 3px 10px; border: 1px solid oklch(53% .035 225); color: var(--text-on-dark-soft); font-size: .68rem; letter-spacing: .12em; }

.process { display: grid; gap: 72px; padding-block: clamp(100px, 14vw, 180px); }
.process-aside > p:last-child { max-width: 30rem; margin: 32px 0 0; color: var(--ink-soft); }
.process-steps { position: relative; list-style: none; margin: 0; padding: 0 0 0 34px; }
.process-steps::before { content: ""; position: absolute; left: 7px; top: 12px; bottom: 12px; width: 1px; background: var(--line); }
.process-steps li { position: relative; padding: 0 0 52px 22px; }
.process-steps li:last-child { padding-bottom: 0; }
.step-dot { position: absolute; left: -32px; top: 7px; width: 12px; height: 12px; background: var(--paper); border: 2px solid var(--seal); transform: rotate(45deg); }
.process-steps small { color: var(--seal-deep); font-size: .66rem; letter-spacing: .16em; }
.process-steps h3 { margin: 4px 0 8px; font-family: var(--display); font-size: 1.6rem; }
.process-steps p { max-width: 36rem; margin: 0; color: var(--ink-soft); }

.principles { padding-block: clamp(96px, 12vw, 160px); background: var(--paper-deep); }
.principles-grid { display: grid; gap: 16px; }
.principles-title { margin-bottom: 36px; }
.principle { position: relative; min-height: 280px; padding: 32px; overflow: hidden; border-top: 1px solid var(--ink); }
.principle > span { position: absolute; right: 18px; top: -20px; color: oklch(83% .035 80); font-family: var(--display); font-size: 8rem; line-height: 1; }
.principle h3 { position: relative; margin: 100px 0 12px; font-family: var(--display); font-size: 1.5rem; }
.principle p { position: relative; margin: 0; color: var(--ink-soft); }
.principle-b { background: var(--ink); color: var(--paper); }
.principle-b > span { color: oklch(34% .045 225); }
.principle-b p { color: var(--text-on-dark-soft); }
.principle-c { border-color: var(--seal); }

.questions { display: grid; gap: 56px; padding-block: clamp(100px, 14vw, 180px); }
.question-list { border-top: 2px solid var(--ink); }
.question-list details { border-bottom: 1px solid var(--line); }
.question-list summary { display: flex; justify-content: space-between; gap: 24px; min-height: 72px; padding: 22px 0; cursor: pointer; list-style: none; font-family: var(--display); font-size: 1.15rem; font-weight: 600; }
.question-list summary::-webkit-details-marker { display: none; }
.question-list summary span { color: var(--seal); font-family: var(--body); font-weight: 400; transition: transform 240ms var(--ease-out); }
.question-list details[open] summary span { transform: rotate(45deg); }
.question-list details p { max-width: 42rem; margin: -4px 0 24px; color: var(--ink-soft); }

.closing { padding-block: clamp(88px, 12vw, 140px); background: var(--seal-deep); color: oklch(94% .018 80); }
.closing .section-kicker { color: oklch(82% .06 72); }
.closing-inner { position: relative; }
.closing h2 { max-width: 14ch; }
.closing-link { display: inline-flex; align-items: center; gap: 28px; margin-top: 44px; min-height: 44px; text-underline-offset: 8px; }
.site-footer { padding: 44px 0 max(44px, env(safe-area-inset-bottom)); background: var(--surface-dark); color: var(--text-on-dark-soft); }
.footer-grid { display: grid; gap: 24px; font-size: .78rem; }
.footer-grid strong { color: var(--text-on-dark); font-family: var(--display); font-size: 1.05rem; letter-spacing: .1em; }
.footer-grid p { margin: 4px 0 0; }

.reveal { opacity: 0; transform: translateY(22px); transition: opacity 640ms var(--ease-out), transform 640ms var(--ease-out); transition-delay: calc(var(--i, 0) * 70ms); }
.reveal.is-visible { opacity: 1; transform: translateY(0); }

:focus-visible { outline: 2px solid var(--seal); outline-offset: 4px; }

@media (hover: hover) {
  .primary-nav a:hover::after { right: 4px; }
  .primary-action:hover { background: var(--seal-deep); transform: translateY(-2px); }
  .text-action:hover, .closing-link:hover { text-decoration-thickness: 2px; }
  .service-row { transition: background 220ms var(--ease-out), padding 220ms var(--ease-out); }
  .service-row:hover { padding-inline: 16px; background: var(--surface-dark-raised); }
}

@media (min-width: 680px) {
  :root { --shell: min(1180px, calc(100vw - 72px)); }
  .hero { padding-top: 164px; }
  .hero-grid { grid-template-columns: minmax(0, 1.15fr) minmax(300px, .85fr); gap: 44px; }
  .intro-layout { grid-template-columns: 1fr .8fr; align-items: end; }
  .service-row { grid-template-columns: 48px minmax(180px, .7fr) minmax(280px, 1.3fr) 64px; align-items: center; }
  .service-row p { grid-column: auto; margin: 0; }
  .process { grid-template-columns: minmax(260px, .85fr) minmax(360px, 1.15fr); align-items: start; }
  .process-aside { position: sticky; top: 36px; }
  .principles-grid { grid-template-columns: repeat(2, 1fr); }
  .principles-title { grid-column: 1 / -1; }
  .principle-c { grid-column: 1 / -1; }
  .questions { grid-template-columns: .8fr 1.2fr; }
  .footer-grid { grid-template-columns: 1fr auto auto; align-items: end; }
}

@media (min-width: 900px) {
  .nav-toggle { display: none; }
  .primary-nav { display: flex; align-items: center; gap: clamp(24px, 4vw, 48px); }
  .hero-grid { min-height: 590px; }
  .hero-ledger { padding: 30px; }
  .principles-grid { grid-template-columns: 1.1fr repeat(3, 1fr); align-items: stretch; }
  .principles-title { grid-column: auto; margin: 0 32px 0 0; align-self: center; }
  .principles-title h2 { font-size: clamp(2.5rem, 4.5vw, 4.7rem); }
  .principle-c { grid-column: auto; }
}

@media (pointer: coarse) {
  .primary-nav a, .text-action, .closing-link { min-height: 48px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; }
  .reveal { opacity: 1; transform: none; }
}