:root {
  --paper: oklch(0.955 0.018 82);
  --paper-deep: oklch(0.91 0.025 78);
  --ink: oklch(0.25 0.045 157);
  --ink-soft: oklch(0.39 0.035 150);
  --forest: oklch(0.32 0.075 155);
  --forest-deep: oklch(0.22 0.055 156);
  --rust: oklch(0.58 0.12 48);
  --gold: oklch(0.71 0.09 82);
  --sage: oklch(0.68 0.055 144);
  --line: color-mix(in oklch, var(--ink) 18%, transparent);
  --display: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "STSong", serif;
  --body: "Noto Sans SC", "Source Han Sans SC", "Microsoft YaHei", sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; background: var(--paper); }
body {
  margin: 0;
  color: var(--ink);
  background:
    linear-gradient(90deg, transparent 0 6.8%, color-mix(in oklch, var(--ink) 5%, transparent) 6.8% 7%, transparent 7%),
    var(--paper);
  font-family: var(--body);
  font-size: 16px;
  line-height: 1.75;
  text-rendering: optimizeLegibility;
}
a { color: inherit; }
a:focus-visible, summary:focus-visible {
  outline: 2px solid var(--rust);
  outline-offset: 4px;
}
.site-head {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid var(--line);
  background: color-mix(in oklch, var(--paper) 94%, transparent);
  backdrop-filter: blur(8px);
}
.head-inner {
  width: min(1180px, calc(100% - 48px));
  min-height: 76px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
}
.brand { display: inline-flex; align-items: center; gap: 12px; text-decoration: none; }
.brand-mark {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border: 1px solid var(--forest);
  border-radius: 50%;
  font-family: var(--display);
  font-size: 20px;
  color: var(--forest);
}
.brand-copy { font-family: var(--display); font-size: 19px; letter-spacing: .16em; }
.brand-copy small { display: block; font-family: var(--body); font-size: 8px; letter-spacing: .22em; color: var(--ink-soft); }
.nav { display: flex; align-items: center; gap: 25px; font-size: 13px; letter-spacing: .04em; }
.nav a { text-decoration: none; transition: color .2s ease; }
.nav a:hover { color: var(--rust); }
.nav-apply { border-left: 1px solid var(--line); padding-left: 25px; font-weight: 700; }
.masthead {
  width: min(1180px, calc(100% - 48px));
  min-height: min(760px, calc(100vh - 76px));
  margin: 0 auto;
  padding: clamp(80px, 10vw, 150px) 0 70px;
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(260px, .8fr);
  align-items: center;
  gap: 60px;
}
.masthead__copy { animation: rise .9s cubic-bezier(.16, 1, .3, 1) both; }
.eyebrow {
  margin: 0 0 22px;
  color: var(--rust);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: .22em;
  text-transform: uppercase;
}
h1, h2, h3, p { margin-top: 0; }
h1, h2, h3 { font-family: var(--display); font-weight: 500; }
h1 {
  max-width: 760px;
  margin-bottom: 26px;
  font-size: clamp(44px, 7vw, 88px);
  line-height: 1.08;
  letter-spacing: -.06em;
}
.lead {
  max-width: 650px;
  margin-bottom: 36px;
  color: var(--ink-soft);
  font-size: clamp(16px, 1.8vw, 20px);
  line-height: 1.9;
}
.masthead__actions, .cta-actions { display: flex; flex-wrap: wrap; gap: 12px; }
.button {
  display: inline-flex;
  align-items: center;
  gap: 18px;
  min-height: 48px;
  padding: 0 20px;
  border: 1px solid var(--forest);
  text-decoration: none;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .04em;
  transition: background .2s ease, color .2s ease, border-color .2s ease;
}
.button span { color: var(--gold); font-size: 17px; }
.button--primary { color: var(--paper); background: var(--forest); }
.button--primary:hover { background: var(--forest-deep); }
.button--ghost, .button--quiet { background: transparent; }
.button--ghost:hover, .button--quiet:hover { color: var(--paper); background: var(--forest); }
.button--quiet { border-color: transparent; padding-inline: 15px; }
.masthead__art {
  position: relative;
  min-height: 480px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-left: 1px solid var(--line);
  animation: fade 1.2s .18s ease both;
}
.masthead__art svg { width: min(100%, 330px); fill: none; stroke: var(--forest); stroke-width: 1.3; opacity: .76; }
.masthead__art circle { fill: var(--rust); stroke: none; }
.art-caption {
  position: absolute;
  right: 8px;
  bottom: 20px;
  color: var(--ink-soft);
  font-size: 9px;
  letter-spacing: .2em;
  writing-mode: vertical-rl;
}
.section { width: min(1180px, calc(100% - 48px)); margin: 0 auto; padding: clamp(72px, 9vw, 130px) 0; border-top: 1px solid var(--line); }
.section-head { display: grid; grid-template-columns: 86px minmax(0, 1fr); gap: 22px; align-items: start; margin-bottom: 48px; }
.chapter { color: var(--rust); font-family: var(--display); font-size: 15px; }
.section h2 { max-width: 760px; margin-bottom: 20px; font-size: clamp(32px, 4.5vw, 57px); line-height: 1.18; letter-spacing: -.045em; }
.section h3 { margin-bottom: 9px; font-size: 24px; letter-spacing: -.025em; }
.path-list { border-top: 1px solid var(--ink); }
.path-row {
  display: grid;
  grid-template-columns: 58px minmax(0, 1fr) minmax(190px, .3fr);
  gap: 24px;
  align-items: center;
  padding: 27px 0;
  border-bottom: 1px solid var(--line);
}
.path-row p { max-width: 640px; margin-bottom: 0; color: var(--ink-soft); }
.path-index { align-self: start; color: var(--rust); font-family: var(--display); font-size: 15px; }
.text-link { display: inline-flex; justify-content: space-between; gap: 15px; padding-bottom: 4px; border-bottom: 1px solid var(--ink); text-decoration: none; font-size: 12px; font-weight: 700; }
.text-link:hover { color: var(--rust); border-color: var(--rust); }
.section--split { display: grid; grid-template-columns: minmax(200px, .38fr) minmax(0, 1fr); gap: 70px; }
.aside-note { padding-top: 8px; border-top: 3px solid var(--rust); }
.aside-title { max-width: 220px; font-family: var(--display); font-size: 29px; line-height: 1.35; }
.prose-block { max-width: 760px; }
.prose-block h2 { margin-top: 0; }
.prose-block p { color: var(--ink-soft); font-size: 17px; }
.plain-list { margin: 24px 0 0; padding: 0; list-style: none; border-top: 1px solid var(--line); }
.plain-list li { padding: 12px 0; border-bottom: 1px solid var(--line); }
.plain-list li::before { content: "—"; margin-right: 12px; color: var(--rust); }
.process-list { display: grid; grid-template-columns: repeat(4, 1fr); margin: 0; padding: 0; list-style: none; border-top: 1px solid var(--ink); }
.process-list li { min-height: 230px; padding: 24px 22px 0 0; border-right: 1px solid var(--line); }
.process-list li + li { padding-left: 22px; }
.process-list li:last-child { border-right: 0; }
.process-list li > span { display: block; margin-bottom: 45px; color: var(--rust); font-size: 12px; font-weight: 700; }
.process-list h3 { font-size: 21px; }
.process-list p { color: var(--ink-soft); font-size: 14px; }
.section--cta { display: flex; align-items: end; justify-content: space-between; gap: 40px; }
.section--cta h2 { max-width: 720px; margin-bottom: 0; }
.cta-copy { max-width: 580px; color: var(--ink-soft); }
.detail-hero { width: min(1180px, calc(100% - 48px)); margin: 0 auto; padding: clamp(80px, 11vw, 155px) 0 60px; }
.detail-hero__grid { display: grid; grid-template-columns: 1fr .45fr; gap: 70px; align-items: end; }
.detail-hero h2 { max-width: 780px; margin-bottom: 0; font-size: clamp(32px, 5vw, 64px); line-height: 1.2; letter-spacing: -.05em; }
.detail-hero__aside { padding: 22px 0 0; border-top: 1px solid var(--ink); color: var(--ink-soft); font-size: 14px; }
.detail-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 80px; }
.detail-grid--sand { background: var(--paper-deep); }
.detail-column > h2 { font-size: clamp(30px, 4vw, 48px); }
.small-note { color: var(--ink-soft); font-size: 13px; }
.faq-list { padding-top: 60px; }
.faq-item { border-top: 1px solid var(--line); }
.faq-item:last-child { border-bottom: 1px solid var(--line); }
.faq-item summary { display: grid; grid-template-columns: 50px 1fr; gap: 16px; padding: 24px 0; cursor: pointer; font-family: var(--display); font-size: clamp(20px, 2.5vw, 28px); line-height: 1.45; list-style: none; }
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary span { padding-top: 5px; color: var(--rust); font-family: var(--body); font-size: 11px; }
.faq-item p { max-width: 850px; margin: 0 0 26px 66px; color: var(--ink-soft); }
.site-foot { width: min(1180px, calc(100% - 48px)); margin: 0 auto; padding: 50px 0 65px; border-top: 1px solid var(--ink); display: grid; grid-template-columns: 1fr auto; gap: 25px 70px; }
.foot-brand { margin-bottom: 4px; font-family: var(--display); font-size: 25px; letter-spacing: .16em; }
.site-foot p { margin-bottom: 0; color: var(--ink-soft); font-size: 13px; }
.foot-links { display: flex; flex-wrap: wrap; gap: 22px; font-size: 13px; }
.foot-links a { text-decoration: none; border-bottom: 1px solid transparent; }
.foot-links a:hover { border-color: var(--rust); }
.foot-note { grid-column: 1 / -1; padding-top: 24px; border-top: 1px solid var(--line); font-size: 11px !important; }
@keyframes rise { from { opacity: 0; transform: translateY(28px); } to { opacity: 1; transform: translateY(0); } }
@keyframes fade { from { opacity: 0; } to { opacity: 1; } }
@media (max-width: 820px) {
  body { background: var(--paper); }
  .head-inner { min-height: 66px; }
  .nav { gap: 14px; overflow-x: auto; padding: 6px 0; }
  .nav a:not(.nav-apply) { display: none; }
  .masthead { min-height: auto; grid-template-columns: 1fr; padding-top: 75px; }
  .masthead__art { min-height: 300px; border-left: 0; border-top: 1px solid var(--line); }
  .section { padding: 70px 0; }
  .section-head, .section--split, .detail-hero__grid, .detail-grid, .site-foot { grid-template-columns: 1fr; gap: 30px; }
  .section-head { gap: 12px; }
  .path-row { grid-template-columns: 38px minmax(0, 1fr); gap: 12px; }
  .path-row .text-link { grid-column: 2; width: max-content; }
  .process-list { grid-template-columns: 1fr 1fr; }
  .process-list li { min-height: 210px; }
  .process-list li:nth-child(2) { border-right: 0; }
  .section--cta { align-items: start; flex-direction: column; }
  .faq-item p { margin-left: 0; }
  .site-foot { gap: 22px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; }
}