/* roulang page: index */
:root {
  --bs-body-bg: #F3EEE6;
  --bs-body-color: #1C1614;
  --bs-primary: #6E3140;
  --bs-primary-rgb: 110, 49, 64;
  --bs-link-color: #1C1614;
  --bs-link-hover-color: #6E3140;
  --bs-border-color: rgba(28, 22, 20, .12);
  --bs-border-radius: 2px;
  --bs-border-radius-sm: 2px;
  --bs-border-radius-lg: 2px;
  --bs-border-radius-xl: 2px;
  --bs-border-radius-xxl: 2px;
  --bs-focus-ring-color: rgba(110, 49, 64, .28);
  --paper: #F3EEE6;
  --paper-2: #F8F4EE;
  --paper-3: #EFE8DE;
  --ink: #1C1614;
  --muted: rgba(28, 22, 20, .68);
  --line: rgba(28, 22, 20, .12);
  --line-strong: rgba(28, 22, 20, .28);
  --plum: #6E3140;
  --plum-hover: #8A4452;
  --rose: #CDB6B2;
  --copper: #8C6A45;
  --serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", serif;
  --sans: "PingFang SC", "Noto Sans SC", "Microsoft YaHei", sans-serif;
  --space: 76px;
}
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.8;
  text-rendering: optimizeLegibility;
}
img { max-width: 100%; display: block; }
button, input, select { font-family: inherit; }
a { color: var(--ink); text-decoration: none; }
a:hover { color: var(--plum); }
:focus-visible {
  outline: 1px solid var(--plum);
  outline-offset: 2px;
  box-shadow: none !important;
}
.container { max-width: 1140px; }
@media (min-width: 1200px) {
  .container { max-width: 1140px; }
}
.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background: rgba(243, 238, 230, .96);
  border-bottom: 1px solid var(--line);
  transition: border-color .24s ease;
}
.site-header.is-stuck { border-bottom-color: var(--line-strong); }
.navbar { padding: 0; min-height: 68px; }
.navbar .container { min-height: 68px; }
.brand {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  font-family: var(--serif);
  font-weight: 650;
  font-size: 20px;
  letter-spacing: -.03em;
  color: var(--ink);
  line-height: 1.2;
}
.brand sup {
  font-family: var(--sans);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: .12em;
  color: var(--copper);
  top: -.7em;
}
.nav-main { gap: 4px; }
.nav-main .nav-link {
  color: var(--ink);
  font-size: 15px;
  padding: 8px 12px;
  border-radius: 0;
  position: relative;
}
.nav-main .nav-link::after {
  content: "";
  position: absolute;
  left: 12px;
  right: 12px;
  bottom: 4px;
  height: 1px;
  background: var(--plum);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .24s ease;
}
.nav-main .nav-link:hover::after,
.nav-main .nav-link.active::after { transform: scaleX(1); }
.nav-main .nav-link.active { color: var(--plum); font-weight: 500; }
.nav-cta { display: flex; gap: 8px; align-items: center; }
.btn-plum, .btn-ink {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 38px;
  padding: 6px 14px;
  border-radius: 2px;
  font-size: 14px;
  letter-spacing: .02em;
  line-height: 1.4;
  border: 1px solid transparent;
  transition: background-color .24s ease, color .24s ease, border-color .24s ease, transform .24s ease;
  text-decoration: none;
}
.btn-plum {
  background: var(--plum);
  color: var(--paper);
  border-color: var(--plum);
}
.btn-plum:hover, .btn-plum:focus {
  background: var(--plum-hover);
  border-color: var(--plum-hover);
  color: var(--paper);
}
.btn-ink {
  background: transparent;
  color: var(--ink);
  border-color: var(--ink);
}
.btn-ink:hover, .btn-ink:focus {
  background: var(--ink);
  color: var(--paper);
}
.btn-plum:active, .btn-ink:active { transform: translateY(1px); }
.navbar-toggler {
  border: 1px solid var(--line-strong);
  border-radius: 2px;
  padding: 6px 9px;
}
.navbar-toggler:focus { box-shadow: none; }
.navbar-toggler-icon {
  width: 18px;
  height: 14px;
  background-image: none;
  position: relative;
}
.navbar-toggler-icon::before,
.navbar-toggler-icon::after,
.navbar-toggler-icon span {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--ink);
}
.navbar-toggler-icon::before { top: 1px; }
.navbar-toggler-icon::after { bottom: 1px; }
.navbar-toggler-icon span { top: 6px; }
.nav-cta-mobile {
  display: flex;
  gap: 8px;
  padding: 8px 0 16px;
}
.nav-cta-mobile .btn-plum,
.nav-cta-mobile .btn-ink { flex: 1; }
main > section { padding: var(--space) 0; }
main > section + section { border-top: 1px solid var(--line); }
.band { background: var(--paper-3); }
.sec-kicker {
  margin: 0 0 8px;
  color: var(--copper);
  font-size: 13px;
  letter-spacing: .16em;
}
h1, h2, h3, .serif { font-family: var(--serif); font-weight: 650; letter-spacing: -.03em; }
h1 {
  margin: 8px 0 16px;
  font-size: clamp(34px, 4vw, 52px);
  line-height: 1.18;
  color: var(--ink);
}
h2 {
  margin: 0 0 14px;
  font-size: clamp(26px, 3vw, 36px);
  line-height: 1.28;
}
h3 { margin: 0 0 8px; font-size: 22px; line-height: 1.35; }
.lead-copy, .sec-lead {
  margin: 0;
  color: var(--ink);
  font-size: 16px;
  line-height: 1.85;
  max-width: 68ch;
}
.scope {
  margin: 0;
  padding-left: 16px;
  border-left: 1px solid var(--copper);
  color: var(--muted);
  font-size: 15px;
  line-height: 1.8;
}
.pin {
  display: inline-block;
  padding: 1px 7px 2px;
  border: 1px solid var(--copper);
  color: var(--copper);
  font-size: 12px;
  letter-spacing: .12em;
  line-height: 1.6;
}
.mini-ba {
  display: grid;
  grid-template-columns: 1fr 12px 1fr;
  gap: 0;
  margin-top: 28px;
  align-items: stretch;
}
.mini-col {
  background: var(--paper-2);
  border: 1px solid var(--line);
  padding: 16px 16px 12px;
}
.mini-col strong {
  display: block;
  margin-bottom: 8px;
  font-family: var(--serif);
  font-size: 16px;
  font-weight: 650;
}
.mini-col ul { margin: 0; padding: 0; list-style: none; }
.mini-col li {
  padding: 6px 0;
  border-top: 1px solid var(--line);
  font-size: 14px;
  line-height: 1.6;
}
.mini-rule { background: var(--copper); width: 1px; margin: 0 auto; }
.metrics {
  display: flex;
  gap: 12px;
  margin-top: 28px;
}
.metric {
  flex: 1;
  min-width: 0;
  background: var(--paper-2);
  border: 1px solid var(--line);
  padding: 14px 16px 12px;
  transition: transform .24s ease, border-color .24s ease;
}
.metric:hover { transform: translateY(-2px); border-color: var(--line-strong); }
.metric b {
  display: block;
  font-family: var(--serif);
  font-size: 32px;
  font-weight: 650;
  letter-spacing: -.04em;
  line-height: 1.1;
}
.metric span { display: block; margin-top: 4px; color: var(--muted); font-size: 13px; }
.genre-rail {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 10px;
  margin-top: 26px;
}
.genre-item {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-height: 132px;
  padding: 14px 12px;
  background: var(--paper-2);
  border: 1px solid var(--line);
  color: var(--ink);
  transition: transform .24s ease, border-color .24s ease;
}
.genre-item:hover { transform: translateY(-2px); border-color: var(--plum); color: var(--ink); }
.genre-item em { font-style: normal; font-family: var(--serif); font-size: 18px; letter-spacing: -.02em; }
.genre-item small { color: var(--muted); font-size: 13px; }
.genre-item i { font-style: normal; color: var(--copper); font-size: 13px; letter-spacing: .06em; }
.paper {
  background: var(--paper-2);
  border: 1px solid var(--line);
  transition: transform .24s ease, border-color .24s ease;
}
.paper:hover { transform: translateY(-2px); border-color: var(--line-strong); }
.main-card, .stack-card { padding: 22px 22px 18px; height: 100%; }
.stack-card + .stack-card { margin-top: 12px; }
.meta-row, .quiet {
  color: var(--muted);
  font-size: 13px;
  letter-spacing: .04em;
}
.main-card p, .stack-card p, .scene-card p, .post-card p, .note-main p { margin: 8px 0 0; font-size: 15px; line-height: 1.75; }
.scene-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  grid-template-areas: "a b" "c c";
  gap: 14px;
  margin-top: 26px;
}
.scene-a { grid-area: a; }
.scene-b { grid-area: b; }
.scene-c { grid-area: c; }
.scene-card { display: block; color: inherit; min-height: 100%; }
.scene-card .body, .post-card .body, .pin-card .body { padding: 16px 16px 18px; }
.frame {
  position: relative;
  aspect-ratio: 16 / 9;
  background:
    linear-gradient(180deg, rgba(28,22,20,.04), rgba(28,22,20,.18)),
    #E7DDD2;
  border-bottom: 1px solid var(--line);
}
.frame.tall { aspect-ratio: 4 / 5; }
.frame.wide { aspect-ratio: 21 / 8; }
.frame.tone-b { background: linear-gradient(160deg, #E7D5D2, #CDB6B2 70%, #E7DDD2); }
.frame.tone-c { background: linear-gradient(200deg, #E8D7C4, #CDB6B2 40%, #E7DDD2); }
.frame.tone-d { background: linear-gradient(180deg, #EFE8DE, #D9C7BA); }
.frame-meta {
  position: absolute;
  left: 12px;
  bottom: 12px;
  color: var(--ink);
  font-size: 13px;
  letter-spacing: .04em;
}
.time {
  position: absolute;
  right: 10px;
  bottom: 10px;
  background: var(--copper);
  color: var(--paper);
  font-size: 12px;
  line-height: 1.5;
  padding: 1px 6px;
}
.compare {
  display: grid;
  grid-template-columns: 1fr 1px 1fr;
  gap: 28px;
  margin-top: 28px;
  align-items: start;
}
.compare-col h3 { font-size: 22px; }
.compare ol { margin: 12px 0 0; padding: 0; list-style: none; counter-reset: item; }
.compare li {
  counter-increment: item;
  padding: 12px 0 12px 36px;
  border-top: 1px solid var(--line);
  position: relative;
  font-size: 15px;
  line-height: 1.7;
}
.compare li::before {
  content: counter(item, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 12px;
  color: var(--copper);
  font-family: var(--serif);
  font-size: 13px;
}
.compare-rule { background: var(--copper); }
.timeline {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 18px;
}
.tl-item {
  margin: 0;
  padding-top: 14px;
  border-top: 1px solid var(--copper);
}
.tl-item time {
  display: block;
  color: var(--copper);
  font-size: 13px;
  letter-spacing: .04em;
}
.tl-item p { margin: 8px 0 0; font-size: 15px; line-height: 1.7; }
.pin-card { display: block; color: inherit; margin-top: 26px; }
.post-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  margin-top: 14px;
}
.post-card { display: block; color: inherit; height: 100%; }
.more-row { margin-top: 18px; }
.more-row a {
  color: var(--plum);
  border-bottom: 1px solid var(--plum);
  font-size: 15px;
  padding-bottom: 2px;
}
.news-list { margin: 22px 0 0; padding: 0; list-style: none; }
.news-item {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 18px;
  align-items: center;
  padding: 14px 16px;
  border-top: 1px solid var(--line);
}
.news-item:last-child { border-bottom: 1px solid var(--line); }
.news-item:nth-child(odd) { background: rgba(205, 182, 178, .28); }
.news-item a { font-family: var(--serif); font-size: 18px; letter-spacing: -.02em; }
.news-item p { margin: 4px 0 0; color: var(--muted); font-size: 14px; line-height: 1.7; }
.news-item time { color: var(--copper); font-size: 13px; white-space: nowrap; }
.assure-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
  margin-top: 26px;
}
.assure-item {
  padding: 18px 16px 16px;
  border: 1px solid var(--line);
  background: var(--paper-2);
  min-height: 168px;
}
.assure-item svg { display: block; margin-bottom: 12px; }
.assure-item h3 { font-size: 18px; }
.assure-item p { margin: 0; font-size: 14px; line-height: 1.75; color: var(--ink); }
.note-layout {
  display: grid;
  grid-template-columns: 1.4fr .8fr;
  gap: 14px;
  margin-top: 26px;
}
.note-main, .note-side { padding: 22px; }
.note-side ol { margin: 0; padding: 0; list-style: none; }
.note-side li { padding: 12px 0; border-top: 1px solid var(--line); }
.note-side li:first-child { border-top: 0; padding-top: 0; }
.note-side a { font-family: var(--serif); font-size: 18px; }
.note-side p { margin: 4px 0 0; font-size: 14px; color: var(--muted); line-height: 1.7; }
.qa-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin-top: 26px;
}
.qa-item { padding: 20px 18px 18px; background: var(--paper-2); border: 1px solid var(--line); }
.qa-item h3 { font-size: 18px; min-height: 56px; }
.qa-item p { margin: 0; font-size: 15px; line-height: 1.75; }
.accordion { --bs-accordion-bg: transparent; --bs-accordion-border-color: transparent; --bs-accordion-btn-focus-box-shadow: none; --bs-accordion-active-bg: transparent; --bs-accordion-active-color: var(--ink); --bs-accordion-btn-color: var(--ink); }
.acc-item { border-bottom: 1px solid var(--line); background: transparent; }
.accordion-button {
  background: transparent;
  color: var(--ink);
  font-family: var(--serif);
  font-size: 18px;
  letter-spacing: -.02em;
  padding: 16px 0;
  box-shadow: none;
  border-radius: 0 !important;
}
.accordion-button:not(.collapsed) { color: var(--plum); background: transparent; box-shadow: none; }
.accordion-button::after {
  background-image: none;
  content: "+";
  font-family: var(--serif);
  font-size: 22px;
  width: auto;
  height: auto;
  color: var(--copper);
  transform: none;
}
.accordion-button:not(.collapsed)::after { content: "–"; transform: none; }
.acc-body { padding: 0 0 16px; font-size: 15px; line-height: 1.8; max-width: 72ch; }
.use-grid {
  display: grid;
  grid-template-columns: 1.4fr 1.1fr .9fr;
  gap: 14px;
  margin-top: 26px;
}
.use-card { padding: 22px 20px; background: var(--paper-2); border: 1px solid var(--line); min-height: 220px; }
.use-card h3 { font-size: 22px; }
.use-card p { margin: 0; font-size: 15px; line-height: 1.8; }
.sub-wrap { max-width: 640px; margin: 0 auto; }
.sub-form { margin-top: 22px; display: grid; gap: 14px; }
.field label { display: block; margin-bottom: 6px; font-size: 14px; }
.form-control, .form-select {
  background: var(--paper-2);
  border: 1px solid rgba(28, 22, 20, .22);
  border-radius: 2px;
  color: var(--ink);
  min-height: 46px;
  font-size: 16px;
  box-shadow: none;
}
.form-control:focus, .form-select:focus {
  background: var(--paper-2);
  border-color: var(--plum);
  color: var(--ink);
  box-shadow: none;
  outline: 1px solid var(--plum);
}
.field.is-error .form-control,
.field.is-error .form-select { border-color: var(--plum); }
.err { display: none; margin-top: 4px; color: var(--plum); font-size: 13px; }
.field.is-error .err { display: block; }
.sub-form .btn-plum { min-height: 46px; width: 100%; border: 0; cursor: pointer; }
.thanks {
  margin-top: 18px;
  padding: 18px 16px;
  border: 1px solid var(--plum);
  background: var(--paper-2);
}
.thanks p { margin: 0; }
.site-footer {
  border-top: 1px solid var(--line-strong);
  padding: 42px 0 28px;
  background: #EBE4DA;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr .8fr;
  gap: 24px;
  padding-bottom: 22px;
  border-bottom: 1px solid var(--line);
}
.footer-brand {
  font-family: var(--serif);
  font-size: 22px;
  letter-spacing: -.03em;
  margin: 0 0 8px;
}
.footer-grid p { margin: 0; color: var(--muted); font-size: 14px; max-width: 42ch; }
.footer-links { display: flex; flex-wrap: wrap; gap: 8px 16px; align-content: flex-start; }
.footer-links a { font-size: 14px; border-bottom: 1px solid transparent; }
.footer-links a:hover { border-bottom-color: var(--plum); color: var(--plum); }
.copy { margin: 16px 0 0; color: var(--muted); font-size: 13px; }
@media (max-width: 1199.98px) {
  .genre-rail { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}
@media (max-width: 991.98px) {
  :root { --space: 60px; }
  .scope { padding-left: 0; border-left: 0; margin-top: 8px; }
  .timeline { grid-template-columns: 1fr; gap: 0; }
  .tl-item { border-top: 0; border-left: 1px solid var(--copper); padding: 0 0 18px 16px; }
  .assure-grid, .qa-grid, .use-grid { grid-template-columns: 1fr 1fr; }
  .note-layout, .footer-grid { grid-template-columns: 1fr; }
  .frame.wide { aspect-ratio: 16 / 9; }
  .navbar-collapse { padding-bottom: 8px; }
}
@media (max-width: 767.98px) {
  .scene-grid { grid-template-columns: 1fr; grid-template-areas: "a" "b" "c"; }
  .post-grid, .assure-grid, .qa-grid, .use-grid, .genre-rail { grid-template-columns: 1fr; }
  .compare { grid-template-columns: 1fr; gap: 18px; }
  .compare-rule { width: 100%; height: 1px; }
  .mini-ba { grid-template-columns: 1fr; }
  .mini-rule { width: 100%; height: 1px; }
  .news-item { grid-template-columns: 1fr; gap: 4px; }
  h1 { font-size: 32px; }
}
@media (max-width: 575.98px) {
  body { font-size: 16px; }
  .metrics { overflow-x: auto; padding-bottom: 6px; }
  .metric { min-width: 148px; flex: 0 0 148px; }
  .genre-rail { display: flex; overflow-x: auto; }
  .genre-item { min-width: 168px; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation: none !important;
    transition: none !important;
    scroll-behavior: auto !important;
  }
  .metric:hover, .paper:hover, .genre-item:hover { transform: none; }
}

/* roulang page: category1 */
:root {
  --bs-body-bg: #F3EEE6;
  --bs-body-color: #1C1614;
  --bs-primary: #6E3140;
  --bs-primary-rgb: 110, 49, 64;
  --bs-link-color: #1C1614;
  --bs-link-hover-color: #6E3140;
  --bs-border-color: rgba(28, 22, 20, .12);
  --bs-border-radius: 2px;
  --bs-border-radius-sm: 2px;
  --bs-border-radius-lg: 2px;
  --bs-border-radius-xl: 2px;
  --bs-border-radius-xxl: 2px;
  --bs-focus-ring-color: rgba(110, 49, 64, .28);
  --paper: #F3EEE6;
  --paper-2: #F8F4EE;
  --paper-3: #EFE8DE;
  --ink: #1C1614;
  --muted: rgba(28, 22, 20, .68);
  --line: rgba(28, 22, 20, .12);
  --line-strong: rgba(28, 22, 20, .28);
  --plum: #6E3140;
  --plum-hover: #8A4452;
  --rose: #CDB6B2;
  --copper: #8C6A45;
  --serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", serif;
  --sans: "PingFang SC", "Noto Sans SC", "Microsoft YaHei", sans-serif;
  --space: 76px;
}
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.8;
  text-rendering: optimizeLegibility;
}
img { max-width: 100%; display: block; }
button, input, select, textarea { font-family: inherit; }
a { color: var(--ink); text-decoration: none; }
a:hover { color: var(--plum); }
:focus-visible {
  outline: 1px solid var(--plum);
  outline-offset: 2px;
}
.container { max-width: 1140px; }
.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background: rgba(243, 238, 230, .96);
  border-bottom: 1px solid var(--line);
  transition: border-color .24s ease;
}
.site-header.is-stuck { border-bottom-color: var(--line-strong); }
.navbar { padding: 0; min-height: 68px; }
.navbar .container { min-height: 68px; display: flex; align-items: center; }
.brand {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  font-family: var(--serif);
  font-weight: 650;
  font-size: 20px;
  letter-spacing: -.03em;
  color: var(--ink);
  line-height: 1.2;
  white-space: nowrap;
}
.brand sup {
  font-family: var(--sans);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: .12em;
  color: var(--copper);
  top: -.7em;
}
.nav-main { gap: 4px; align-items: center; }
.nav-main .nav-link {
  color: var(--ink);
  font-size: 15px;
  padding: 8px 12px;
  border-radius: 0;
  position: relative;
}
.nav-main .nav-link::after {
  content: "";
  position: absolute;
  left: 12px;
  right: 12px;
  bottom: 4px;
  height: 1px;
  background: var(--plum);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .24s ease;
}
.nav-main .nav-link:hover::after,
.nav-main .nav-link.active::after { transform: scaleX(1); }
.nav-main .nav-link.active { color: var(--plum); font-weight: 500; }
.nav-cta { display: flex; gap: 8px; align-items: center; }
.btn-plum, .btn-ink {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 38px;
  padding: 6px 14px;
  border-radius: 2px;
  font-size: 14px;
  letter-spacing: .02em;
  line-height: 1.4;
  border: 1px solid transparent;
  background: transparent;
  cursor: pointer;
  transition: background-color .24s ease, color .24s ease, border-color .24s ease, transform .24s ease;
  text-decoration: none;
}
.btn-plum { background: var(--plum); color: var(--paper); border-color: var(--plum); }
.btn-plum:hover, .btn-plum:focus { background: var(--plum-hover); border-color: var(--plum-hover); color: var(--paper); }
.btn-ink { background: transparent; color: var(--ink); border-color: var(--ink); }
.btn-ink:hover, .btn-ink:focus { background: var(--ink); color: var(--paper); }
.btn-plum:active, .btn-ink:active { transform: translateY(1px); }
.navbar-toggler {
  border: 1px solid var(--line-strong);
  border-radius: 2px;
  padding: 6px 9px;
  margin-left: auto;
}
.navbar-toggler:focus { box-shadow: none; }
.navbar-toggler-icon {
  width: 18px;
  height: 14px;
  background-image: none;
  position: relative;
  display: block;
}
.navbar-toggler-icon::before,
.navbar-toggler-icon::after,
.navbar-toggler-icon span {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--ink);
}
.navbar-toggler-icon::before { top: 1px; }
.navbar-toggler-icon::after { bottom: 1px; }
.navbar-toggler-icon span { top: 6px; }
.nav-cta-mobile { display: flex; gap: 8px; padding: 8px 0 16px; }
.nav-cta-mobile .btn-plum,
.nav-cta-mobile .btn-ink { flex: 1; }
main > section { padding: var(--space) 0; }
main > section + section { border-top: 1px solid var(--line); }
.sec-kicker {
  margin: 0 0 8px;
  color: var(--copper);
  font-size: 12px;
  letter-spacing: .14em;
}
.sec-title {
  margin: 0;
  font-family: var(--serif);
  font-weight: 650;
  font-size: 32px;
  line-height: 1.25;
  letter-spacing: -.03em;
}
.sec-lead { margin: 12px 0 0; max-width: 62ch; color: var(--ink); font-size: 16px; line-height: 1.85; }
.cat-head { padding: 36px 0 28px; }
.cat-head-row {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 28px;
}
.cat-head h1 {
  margin: 0;
  font-family: var(--serif);
  font-weight: 650;
  font-size: 40px;
  line-height: 1.2;
  letter-spacing: -.04em;
}
.cat-range { margin: 12px 0 0; max-width: 46ch; color: var(--muted); font-size: 16px; line-height: 1.8; }
.back-link {
  flex: none;
  color: var(--ink);
  font-size: 14px;
  letter-spacing: .06em;
  border-bottom: 1px solid var(--copper);
  padding-bottom: 2px;
}
.back-link:hover { color: var(--plum); border-bottom-color: var(--plum); }
.cat-metrics { padding: 22px 0; background: var(--paper-2); }
.mini-metrics {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.mini-metrics li {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  min-height: 64px;
  padding: 12px 18px;
}
.mini-metrics li + li { border-left: 1px solid var(--line); }
.mini-metrics span { color: var(--muted); font-size: 13px; letter-spacing: .08em; }
.mini-metrics strong {
  font-family: var(--serif);
  font-weight: 650;
  font-size: 28px;
  letter-spacing: -.03em;
  line-height: 1;
}
.cat-filter { padding-top: 28px; padding-bottom: 28px; }
.filter-bar { display: grid; gap: 14px; }
.filter-row { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.filter-row em {
  flex: none;
  width: 72px;
  font-style: normal;
  font-size: 13px;
  letter-spacing: .12em;
  color: var(--copper);
}
.chip {
  appearance: none;
  border: 1px solid var(--line-strong);
  background: transparent;
  color: var(--ink);
  border-radius: 2px;
  min-height: 32px;
  padding: 4px 12px;
  font-size: 14px;
  line-height: 1.4;
  cursor: pointer;
  transition: border-color .22s ease, color .22s ease, background-color .22s ease;
}
.chip:hover { border-color: var(--plum); color: var(--plum); }
.chip.is-on { border-color: var(--plum); color: var(--plum); background: var(--paper-2); }
.cat-list { background: var(--paper); }
.list-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 16px;
  margin-bottom: 22px;
}
.list-head p { margin: 8px 0 0; color: var(--muted); font-size: 14px; }
.post-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px 16px;
}
.post-card {
  display: grid;
  grid-template-columns: 168px 1fr;
  gap: 14px;
  padding: 12px;
  background: var(--paper-2);
  border: 1px solid var(--line);
  color: inherit;
  min-height: 100%;
  transition: transform .24s ease, border-color .24s ease;
}
.post-card:hover { transform: translateY(-2px); border-color: var(--plum); color: inherit; }
.cover {
  position: relative;
  aspect-ratio: 16 / 9;
  background:
    linear-gradient(180deg, transparent 0 62%, rgba(28, 22, 20, .08) 100%),
    var(--paper-3);
  border: 1px solid var(--line);
  overflow: hidden;
}
.cover i {
  position: absolute;
  left: 10px;
  right: 28px;
  top: 46%;
  height: 1px;
  background: var(--copper);
  font-style: normal;
}
.cover b {
  position: absolute;
  left: 10px;
  bottom: 8px;
  font-weight: 500;
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--copper);
}
.dur {
  position: absolute;
  right: 6px;
  bottom: 6px;
  padding: 1px 6px;
  background: var(--ink);
  color: var(--paper);
  font-size: 11px;
  letter-spacing: .04em;
  line-height: 1.6;
}
.post-card:nth-child(3n) .cover i { top: 32%; right: 46px; }
.post-card:nth-child(3n+1) .cover i { top: 58%; left: 24px; }
.post-body { min-width: 0; display: flex; flex-direction: column; }
.tag {
  display: inline-block;
  align-self: flex-start;
  color: var(--plum);
  font-size: 12px;
  letter-spacing: .08em;
}
.post-body h3 {
  margin: 4px 0 0;
  font-family: var(--serif);
  font-weight: 650;
  font-size: 18px;
  line-height: 1.35;
  letter-spacing: -.02em;
}
.post-body p {
  margin: 6px 0 0;
  color: var(--ink);
  font-size: 14px;
  line-height: 1.7;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.post-body time { margin-top: auto; padding-top: 8px; color: var(--muted); font-size: 12px; letter-spacing: .06em; }
.list-more { display: flex; justify-content: flex-end; margin-top: 18px; }
.more-link {
  font-size: 14px;
  letter-spacing: .08em;
  border-bottom: 1px solid var(--copper);
  padding-bottom: 2px;
}
.more-link:hover { color: var(--plum); border-bottom-color: var(--plum); }
.cat-split { background: var(--paper-2); }
.split-grid {
  display: grid;
  grid-template-columns: 1fr 1px 1fr;
  gap: 28px;
  margin-top: 8px;
}
.split-rule { background: var(--copper); }
.split-col h2 {
  margin: 0 0 10px;
  font-family: var(--serif);
  font-size: 24px;
  font-weight: 650;
  letter-spacing: -.03em;
}
.split-col p { margin: 0; font-size: 16px; line-height: 1.85; }
.split-col ul { margin: 14px 0 0; padding: 0; list-style: none; }
.split-col li {
  padding: 8px 0;
  border-top: 1px solid var(--line);
  font-size: 15px;
}
.cat-reads { background: var(--paper); }
.read-list { list-style: none; margin: 22px 0 0; padding: 0; border-top: 1px solid var(--line); }
.read-list a {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: baseline;
  padding: 14px 8px;
  border-bottom: 1px solid var(--line);
  transition: background-color .22s ease, color .22s ease;
}
.read-list li:nth-child(odd) a { background: rgba(205, 182, 178, .18); }
.read-list a:hover { background: var(--paper-2); color: var(--plum); }
.read-list span { font-family: var(--serif); font-size: 18px; letter-spacing: -.02em; }
.read-list time { flex: none; color: var(--muted); font-size: 13px; letter-spacing: .06em; }
.cat-qa { background: var(--paper-3); }
.qa-stack { margin-top: 8px; }
.qa-block { padding: 18px 0; border-bottom: 1px solid var(--line); }
.qa-block:first-child { border-top: 1px solid var(--line); }
.qa-block h3 {
  margin: 0;
  font-family: var(--serif);
  font-size: 20px;
  font-weight: 650;
  letter-spacing: -.02em;
}
.qa-block h3::before {
  content: "";
  display: inline-block;
  width: 18px;
  height: 1px;
  background: var(--copper);
  margin-right: 10px;
  vertical-align: middle;
}
.qa-block p { margin: 8px 0 0; max-width: 68ch; font-size: 16px; line-height: 1.8; }
.cat-sub { padding: 28px 0; background: var(--ink); color: var(--paper); border-top-color: transparent; }
.sub-row {
  display: flex;
  align-items: center;
  gap: 18px;
}
.sub-copy { flex: 0 1 280px; }
.sub-copy strong {
  display: block;
  font-family: var(--serif);
  font-weight: 650;
  font-size: 22px;
  letter-spacing: -.03em;
}
.sub-copy span { display: block; margin-top: 4px; color: var(--rose); font-size: 13px; line-height: 1.6; }
.sub-form { flex: 1; display: flex; gap: 8px; align-items: center; }
.sub-input {
  flex: 1;
  min-width: 0;
  height: 42px;
  border: 1px solid rgba(243, 238, 230, .35);
  background: transparent;
  color: var(--paper);
  border-radius: 2px;
  padding: 0 12px;
  font-size: 15px;
}
.sub-input::placeholder { color: rgba(243, 238, 230, .55); }
.sub-input:focus { outline: 1px solid var(--rose); border-color: var(--rose); }
.sub-form.is-error .sub-input { border-color: var(--rose); }
.cat-sub .btn-plum { min-width: 112px; background: var(--paper); color: var(--ink); border-color: var(--paper); }
.cat-sub .btn-plum:hover { background: var(--rose); border-color: var(--rose); color: var(--ink); }
.thanks { margin: 0; font-family: var(--serif); font-size: 20px; letter-spacing: -.02em; }
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}
.site-footer { border-top: 1px solid var(--line); padding: 36px 0 28px; background: var(--paper); }
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr .8fr;
  gap: 28px;
  align-items: start;
}
.footer-brand {
  margin: 0 0 8px;
  font-family: var(--serif);
  font-weight: 650;
  font-size: 20px;
  letter-spacing: -.03em;
}
.site-footer p { margin: 0; color: var(--muted); font-size: 14px; line-height: 1.75; max-width: 46ch; }
.footer-links { display: flex; flex-wrap: wrap; gap: 8px 18px; justify-content: flex-end; }
.footer-links a { font-size: 14px; border-bottom: 1px solid transparent; }
.footer-links a:hover { border-bottom-color: var(--plum); }
.copy { margin-top: 22px; padding-top: 14px; border-top: 1px solid var(--line); font-size: 12px; letter-spacing: .04em; }
@media (max-width: 991.98px) {
  .navbar .container { flex-wrap: wrap; }
  .navbar-collapse { flex-basis: 100%; }
  .nav-main { padding: 8px 0 4px; }
  .cat-head h1 { font-size: 32px; }
  .post-card { grid-template-columns: 140px 1fr; }
  .sub-row { flex-direction: column; align-items: stretch; }
  .sub-copy { flex-basis: auto; }
}
@media (max-width: 767.98px) {
  :root { --space: 48px; }
  .cat-head-row, .split-grid, .footer-grid { grid-template-columns: 1fr; display: grid; }
  .cat-head-row { gap: 14px; }
  .split-rule { height: 1px; width: 100%; }
  .post-grid { grid-template-columns: 1fr; }
  .mini-metrics { display: flex; overflow-x: auto; }
  .mini-metrics li { min-width: 210px; }
  .mini-metrics li + li { border-left: 1px solid var(--line); }
  .footer-links { justify-content: flex-start; }
  .sec-title { font-size: 26px; }
  .read-list span { font-size: 16px; }
}
@media (max-width: 575.98px) {
  .post-card { grid-template-columns: 1fr; }
  .cover { max-height: 180px; }
  .cat-head h1 { font-size: 28px; }
  .sub-form { flex-direction: column; align-items: stretch; }
  .filter-row em { width: 100%; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    transition: none !important;
    animation: none !important;
  }
}

/* roulang: framework shim */
/* 覆盖 Bootstrap 等对 a/btn 的全局默认，避免导航出现下划线/蓝链 */
.site-header a,.site-header a:hover,.navbar a,.navbar a:hover,.nav-links a,.nav-links a:hover,header nav a,header nav a:hover{text-decoration:none}
.site-header .btn,.navbar .btn,.nav-cta{text-decoration:none}