:root {
  color-scheme: light;
  --ink: #122235;
  --ink-soft: #405064;
  --paper: #f4efe3;
  --paper-light: #fffdf7;
  --line: #a9a28f;
  --line-strong: #5b6570;
  --verify: #0b7568;
  --verify-soft: #d5ebe5;
  --stop: #a43b32;
  --stop-soft: #f1ddd7;
  --night: #0b1724;
  --gold: #c99a43;
  --shadow: 0 24px 70px rgb(18 34 53 / 12%);
  --serif: "Songti SC", "STSong", "Noto Serif CJK SC", serif;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  background: var(--night);
  scroll-behavior: smooth;
}

body {
  min-width: 0;
  margin: 0;
  color: var(--ink);
  background:
    linear-gradient(90deg, rgb(18 34 53 / 4%) 1px, transparent 1px) 0 0 / 32px 32px,
    linear-gradient(rgb(18 34 53 / 3%) 1px, transparent 1px) 0 0 / 32px 32px,
    var(--paper);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.78;
  text-rendering: optimizeLegibility;
}

img,
svg {
  display: block;
  max-width: 100%;
}

a {
  color: inherit;
  text-decoration-color: var(--verify);
  text-decoration-thickness: 2px;
  text-underline-offset: 0.22em;
}

a:hover {
  color: var(--verify);
}

button,
summary,
a {
  -webkit-tap-highlight-color: transparent;
}

:focus-visible {
  outline: 3px solid var(--gold);
  outline-offset: 4px;
}

.skip-link {
  position: fixed;
  z-index: 100;
  top: 12px;
  left: 12px;
  min-height: 44px;
  padding: 9px 16px;
  color: var(--paper-light);
  background: var(--night);
  transform: translateY(-160%);
}

.skip-link:focus {
  transform: translateY(0);
}

.site-masthead {
  position: relative;
  z-index: 10;
  color: var(--paper-light);
  background: var(--night);
  border-bottom: 1px solid rgb(255 255 255 / 22%);
}

.masthead-inner {
  width: min(1320px, calc(100% - 48px));
  min-height: 76px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(220px, 0.7fr) minmax(0, 1.3fr);
  align-items: center;
  gap: 28px;
}

.brand {
  min-height: 48px;
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.brand img {
  width: 38px;
  height: 38px;
}

.brand-copy {
  display: grid;
  line-height: 1.15;
}

.brand-copy strong {
  font-family: var(--serif);
  font-size: 1.05rem;
  letter-spacing: 0.04em;
}

.brand-copy span {
  margin-top: 4px;
  color: #b9c7d2;
  font-size: 0.7rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
}

.case-nav {
  min-width: 0;
}

.case-nav summary {
  min-height: 44px;
  padding: 8px 12px;
  cursor: pointer;
  color: #d9e4ea;
  border: 1px solid rgb(255 255 255 / 30%);
  list-style: none;
  text-align: center;
}

.case-nav summary::-webkit-details-marker {
  display: none;
}

.case-nav summary::before {
  content: "＋";
  margin-right: 0.55em;
  color: var(--gold);
}

.case-nav[open] summary::before {
  content: "−";
}

.nav-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 6px 16px;
  padding: 14px 0;
}

.nav-links a {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  color: #d9e4ea;
  font-size: 0.83rem;
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.nav-links a:hover,
.nav-links a[aria-current="page"] {
  color: #ffffff;
  border-bottom-color: var(--gold);
}

.breadcrumb {
  width: min(1180px, calc(100% - 48px));
  margin: 0 auto;
  padding: 20px 0 0;
  color: var(--ink-soft);
  font-size: 0.82rem;
}

.breadcrumb ol {
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 6px 10px;
  list-style: none;
}

.breadcrumb li + li::before {
  content: "/";
  margin-right: 10px;
  color: var(--line-strong);
}

.case-file {
  width: min(1180px, calc(100% - 48px));
  margin: 28px auto 84px;
  background: var(--paper-light);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}

.case-cover {
  min-height: 580px;
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(320px, 0.9fr);
  border-bottom: 1px solid var(--line);
}

.cover-copy {
  position: relative;
  padding: clamp(42px, 7vw, 90px);
  border-right: 1px solid var(--line);
}

.folio-label {
  margin: 0 0 34px;
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--verify);
  font-size: 0.74rem;
  font-weight: 760;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.folio-label::before {
  width: 38px;
  height: 2px;
  content: "";
  background: currentColor;
}

h1,
h2,
h3 {
  font-family: var(--serif);
  font-weight: 700;
  text-wrap: balance;
}

h1 {
  max-width: 13em;
  margin: 0;
  font-size: clamp(2.6rem, 6vw, 5.6rem);
  line-height: 1.03;
  letter-spacing: -0.035em;
}

.question {
  max-width: 34em;
  margin: 28px 0 0;
  color: var(--ink-soft);
  font-size: clamp(1.02rem, 1.8vw, 1.25rem);
}

.direct-answer {
  max-width: 45rem;
  margin: 38px 0 0;
  padding: 22px 0 22px 24px;
  font-family: var(--serif);
  font-size: 1.12rem;
  line-height: 1.85;
  border-left: 5px solid var(--verify);
}

.cover-visual {
  min-width: 0;
  display: grid;
  grid-template-rows: minmax(0, 1fr) auto;
  background: #dce5e3;
}

.cover-visual img {
  width: 100%;
  height: 100%;
  min-height: 390px;
  object-fit: cover;
}

.visual-caption {
  margin: 0;
  padding: 18px 24px;
  color: #dbe5e8;
  background: var(--ink);
  font-size: 0.78rem;
  letter-spacing: 0.05em;
}

.scope-strip {
  display: grid;
  grid-template-columns: 160px minmax(0, 1fr) minmax(0, 1fr);
  border-bottom: 1px solid var(--line);
}

.scope-strip > * {
  margin: 0;
  padding: 22px 26px;
}

.scope-strip .scope-name {
  color: var(--paper-light);
  background: var(--ink);
  font-size: 0.76rem;
  font-weight: 750;
  letter-spacing: 0.12em;
}

.scope-strip p + p {
  border-left: 1px solid var(--line);
}

.document-section {
  padding: clamp(42px, 6vw, 80px);
  border-bottom: 1px solid var(--line);
}

.section-heading {
  display: grid;
  grid-template-columns: 110px minmax(0, 1fr);
  align-items: start;
  gap: 24px;
  margin-bottom: 42px;
}

.section-number {
  color: var(--verify);
  font-family: var(--sans);
  font-size: 0.75rem;
  font-weight: 780;
  letter-spacing: 0.14em;
}

.section-heading h2 {
  margin: 0;
  font-size: clamp(1.9rem, 3.3vw, 3.1rem);
  line-height: 1.15;
}

.evidence-track {
  position: relative;
  margin-left: 108px;
  padding-left: 44px;
  border-left: 2px solid var(--line);
}

.evidence-entry {
  position: relative;
  max-width: 760px;
  padding: 0 0 40px;
}

.evidence-entry:last-child {
  padding-bottom: 0;
}

.evidence-entry::before {
  position: absolute;
  top: 0.65em;
  left: -51px;
  width: 12px;
  height: 12px;
  content: "";
  background: var(--paper-light);
  border: 3px solid var(--verify);
  border-radius: 50%;
}

.entry-index {
  margin: 0 0 8px;
  color: var(--verify);
  font-size: 0.72rem;
  font-weight: 780;
  letter-spacing: 0.13em;
}

.evidence-entry p:last-child {
  margin: 0;
  font-family: var(--serif);
  font-size: 1.07rem;
}

.relation-ledger,
.route-index,
.source-ledger {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 2px solid var(--ink);
}

.relation-ledger li,
.route-index li,
.source-ledger li {
  display: grid;
  grid-template-columns: 92px minmax(0, 1fr);
  gap: 22px;
  padding: 20px 0;
  border-bottom: 1px solid var(--line);
}

.route-index li {
  grid-template-columns: 92px minmax(0, 1fr) 44px;
  align-items: center;
}

.ledger-code {
  color: var(--verify);
  font-size: 0.74rem;
  font-weight: 780;
  letter-spacing: 0.1em;
}

.route-index a {
  min-height: 44px;
  display: flex;
  align-items: center;
  font-family: var(--serif);
  font-size: 1.18rem;
  font-weight: 700;
  text-decoration: none;
}

.route-index .route-arrow {
  color: var(--verify);
  font-size: 1.5rem;
  text-align: right;
}

.action-pair {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  border: 1px solid var(--line);
}

.action-column {
  padding: clamp(26px, 4vw, 46px);
}

.action-column + .action-column {
  border-left: 1px solid var(--line);
}

.action-column.stop {
  background: var(--stop-soft);
}

.action-column h3 {
  margin: 0 0 24px;
  font-size: 1.55rem;
}

.action-column ol,
.action-column ul {
  margin: 0;
  padding-left: 1.4em;
}

.action-column li + li {
  margin-top: 14px;
}

.faq-list {
  border-top: 2px solid var(--ink);
}

.faq-list details {
  border-bottom: 1px solid var(--line);
}

.faq-list summary {
  min-height: 58px;
  padding: 17px 48px 17px 0;
  cursor: pointer;
  font-family: var(--serif);
  font-weight: 700;
  list-style-position: outside;
}

.faq-list p {
  max-width: 760px;
  margin: 0;
  padding: 0 0 24px 28px;
  color: var(--ink-soft);
}

.source-ledger li {
  grid-template-columns: 92px minmax(0, 1.1fr) minmax(260px, 0.9fr);
}

.source-title {
  margin: 0;
  font-family: var(--serif);
  font-size: 1.05rem;
  font-weight: 700;
}

.source-meta,
.source-scope {
  margin: 6px 0 0;
  color: var(--ink-soft);
  font-size: 0.82rem;
}

.source-scope {
  padding-left: 18px;
  border-left: 3px solid var(--verify-soft);
}

.site-footer {
  color: #cbd5db;
  background: var(--night);
}

.footer-inner {
  width: min(1180px, calc(100% - 48px));
  margin: 0 auto;
  padding: 52px 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 48px;
}

.footer-title {
  margin: 0;
  color: white;
  font-family: var(--serif);
  font-size: 1.25rem;
}

.footer-note {
  max-width: 650px;
  margin: 12px 0 0;
  font-size: 0.86rem;
}

.footer-meta {
  margin: 0;
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-align: right;
}

@media (min-width: 961px) {
  .case-nav summary {
    position: absolute;
    width: 1px;
    height: 1px;
    min-height: 0;
    padding: 0;
    overflow: clip;
    clip-path: inset(50%);
    white-space: nowrap;
  }

  .case-nav:not([open]) .nav-links {
    display: flex;
  }
}

@media (max-width: 960px) {
  .masthead-inner {
    grid-template-columns: minmax(0, 1fr) auto;
  }

  .case-nav {
    position: relative;
  }

  .nav-links {
    position: absolute;
    top: calc(100% + 14px);
    right: 0;
    width: min(82vw, 420px);
    padding: 16px;
    display: grid;
    justify-content: stretch;
    color: var(--paper-light);
    background: var(--night);
    border: 1px solid rgb(255 255 255 / 28%);
    box-shadow: 0 18px 45px rgb(0 0 0 / 32%);
  }

  .case-nav:not([open]) .nav-links {
    display: none;
  }

  .nav-links a {
    padding: 4px 8px;
  }

  .case-cover {
    grid-template-columns: 1fr;
  }

  .cover-copy {
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .scope-strip {
    grid-template-columns: 1fr 1fr;
  }

  .scope-strip .scope-name {
    grid-column: 1 / -1;
  }

  .scope-strip p:first-of-type {
    border-left: 0;
  }

  .source-ledger li {
    grid-template-columns: 72px minmax(0, 1fr);
  }

  .source-scope {
    grid-column: 2;
    padding-left: 0;
    border-left: 0;
  }
}

@media (max-width: 680px) {
  body {
    font-size: 16px;
    line-height: 1.72;
  }

  .masthead-inner,
  .breadcrumb,
  .case-file,
  .footer-inner {
    width: min(100% - 28px, 1180px);
  }

  .brand-copy span {
    display: none;
  }

  .case-file {
    margin-top: 18px;
    margin-bottom: 48px;
  }

  .cover-copy,
  .document-section {
    padding: 34px 22px;
  }

  h1 {
    max-width: none;
    font-size: clamp(2.45rem, 13vw, 4.2rem);
  }

  .question {
    margin-top: 22px;
  }

  .direct-answer {
    margin-top: 28px;
    padding-left: 18px;
  }

  .cover-visual img {
    min-height: 250px;
  }

  .scope-strip {
    grid-template-columns: 1fr;
  }

  .scope-strip .scope-name {
    grid-column: auto;
  }

  .scope-strip p + p {
    border-top: 1px solid var(--line);
    border-left: 0;
  }

  .section-heading {
    grid-template-columns: 1fr;
    gap: 8px;
    margin-bottom: 30px;
  }

  .evidence-track {
    margin-left: 3px;
    padding-left: 30px;
  }

  .evidence-entry::before {
    left: -37px;
  }

  .relation-ledger li,
  .route-index li,
  .source-ledger li {
    grid-template-columns: 1fr;
    gap: 7px;
  }

  .route-index li {
    position: relative;
    padding-right: 38px;
  }

  .route-index .route-arrow {
    position: absolute;
    right: 4px;
    bottom: 22px;
  }

  .action-pair {
    grid-template-columns: 1fr;
  }

  .action-column + .action-column {
    border-top: 1px solid var(--line);
    border-left: 0;
  }

  .source-scope {
    grid-column: auto;
  }

  .footer-inner {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .footer-meta {
    text-align: left;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}

@media print {
  .site-masthead,
  .site-footer,
  .skip-link {
    display: none;
  }

  body {
    background: white;
  }

  .case-file {
    width: 100%;
    margin: 0;
    border: 0;
    box-shadow: none;
  }
}