/* ============================================================
   马拉松医疗保障标准与最佳实践 · MM Standards & Best Practices
   Editorial design system — paper / ink navy / emergency red
   ============================================================ */

:root {
  --paper: #faf8f4;
  --paper-2: #f3f0e9;
  --ink: #1b2432;
  --ink-soft: #3d4757;
  --muted: #7a7668;
  --navy: #17365c;
  --navy-deep: #10263f;
  --red: #cf2e2e;
  --red-deep: #a81f1f;
  --gold: #b98a2f;
  --line: #e4dfd3;
  --line-dark: #d3ccbc;
  --serif: "Songti SC", "STSong", "Noto Serif SC", "Source Han Serif SC", "SimSun", serif;
  --sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Segoe UI", sans-serif;
  --mono: "SF Mono", ui-monospace, "JetBrains Mono", Menlo, Consolas, monospace;
  --max-w: 1120px;
  --prose-w: 740px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

::selection { background: rgba(207, 46, 46, .16); }

a { color: var(--navy); text-decoration: none; }
a:hover { color: var(--red); }

img { max-width: 100%; height: auto; display: block; }

.wrap { max-width: var(--max-w); margin: 0 auto; padding: 0 24px; }

/* ---------- reading progress ---------- */
.progress-bar {
  position: fixed; top: 0; left: 0; height: 3px; width: 0;
  background: linear-gradient(90deg, var(--navy), var(--red));
  z-index: 100; transition: width .08s linear;
}

/* ---------- top nav ---------- */
.site-nav {
  position: sticky; top: 0; z-index: 90;
  background: rgba(250, 248, 244, .92);
  backdrop-filter: saturate(140%) blur(10px);
  border-bottom: 1px solid var(--line);
}
.site-nav .wrap {
  display: flex; align-items: center; justify-content: space-between;
  height: 62px;
}
.brand { display: flex; align-items: center; gap: 12px; }
.brand-mark {
  width: 34px; height: 34px; border-radius: 9px;
  background: var(--navy);
  display: grid; place-items: center; flex: none;
}
.brand-mark svg { width: 22px; height: 22px; }
.brand-text { line-height: 1.25; }
.brand-text b {
  font-family: var(--serif); font-size: 16px; font-weight: 700;
  color: var(--ink); letter-spacing: .02em; display: block;
}
.brand-text span {
  font-family: var(--mono); font-size: 10px; letter-spacing: .14em;
  color: var(--muted); text-transform: uppercase;
}
.nav-links { display: flex; gap: 4px; }
.nav-links a {
  font-size: 14px; color: var(--ink-soft); padding: 7px 13px;
  border-radius: 8px; transition: all .18s ease; white-space: nowrap;
}
.nav-links a:hover { background: var(--paper-2); color: var(--red); }
.nav-links a.active { color: var(--red); font-weight: 600; }

@media (max-width: 860px) {
  .nav-links { display: none; }
  .brand-text b { font-size: 14px; }
}

/* ---------- hero ---------- */
.hero {
  position: relative; overflow: hidden;
  background:
    radial-gradient(1100px 420px at 82% -10%, rgba(23, 54, 92, .07), transparent 60%),
    var(--paper);
  border-bottom: 1px solid var(--line);
  padding: 76px 0 0;
}
.hero-grid {
  display: grid; grid-template-columns: 1.25fr .75fr; gap: 48px;
  align-items: start;
}
.hero-kicker {
  display: inline-flex; align-items: center; gap: 10px;
  font-family: var(--mono); font-size: 11.5px; letter-spacing: .18em;
  color: var(--red); text-transform: uppercase; font-weight: 600;
  margin-bottom: 22px;
}
.hero-kicker::before {
  content: ""; width: 34px; height: 2px; background: var(--red);
}
.hero h1 {
  font-family: var(--serif);
  font-size: clamp(34px, 5vw, 54px);
  line-height: 1.22; font-weight: 900; letter-spacing: .01em;
  color: var(--ink);
}
.hero h1 em { font-style: normal; color: var(--red); }
.hero-sub-en {
  font-family: var(--mono); font-size: 13px; letter-spacing: .22em;
  color: var(--muted); text-transform: uppercase; margin-top: 14px;
}
.hero-lead {
  margin-top: 24px; font-size: 16.5px; color: var(--ink-soft);
  max-width: 56ch; line-height: 1.9;
}
.hero-actions { margin-top: 34px; display: flex; gap: 14px; flex-wrap: wrap; }
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 13px 26px; border-radius: 10px;
  font-size: 15px; font-weight: 600; transition: all .2s ease;
  border: 1px solid transparent;
}
.btn-primary { background: var(--red); color: #fff; box-shadow: 0 6px 18px rgba(207,46,46,.24); }
.btn-primary:hover { background: var(--red-deep); color: #fff; transform: translateY(-2px); }
.btn-ghost { border-color: var(--line-dark); color: var(--navy); background: #fff; }
.btn-ghost:hover { border-color: var(--navy); color: var(--navy); transform: translateY(-2px); }

.hero-panel {
  background: #fff; border: 1px solid var(--line); border-radius: 16px;
  padding: 28px 26px; box-shadow: 0 14px 40px rgba(23, 54, 92, .08);
  margin-bottom: 56px;
}
.hero-panel h3 {
  font-family: var(--mono); font-size: 11px; letter-spacing: .16em;
  text-transform: uppercase; color: var(--muted); font-weight: 600;
  margin-bottom: 18px;
}
.std-item { display: flex; gap: 14px; padding: 14px 0; border-top: 1px dashed var(--line); }
.std-item:first-of-type { border-top: 0; padding-top: 0; }
.std-no {
  font-family: var(--mono); font-weight: 700; color: var(--red);
  font-size: 13px; flex: none; padding-top: 3px;
}
.std-item b { font-size: 14.5px; display: block; color: var(--ink); }
.std-item p { font-size: 13px; color: var(--muted); margin-top: 3px; line-height: 1.6; }

.ecg-band { display: block; width: 100%; height: 74px; margin-top: 8px; }
.ecg-band path {
  fill: none; stroke: var(--red); stroke-width: 2;
  stroke-dasharray: 1400; stroke-dashoffset: 1400;
  animation: ecg 5.5s linear infinite;
  opacity: .85;
}
@keyframes ecg {
  0% { stroke-dashoffset: 1400; }
  55% { stroke-dashoffset: 0; }
  100% { stroke-dashoffset: -1400; }
}
@media (max-width: 900px) {
  .hero-grid { grid-template-columns: 1fr; gap: 36px; }
  .hero { padding-top: 52px; }
  .hero-panel { margin-bottom: 40px; }
}

/* ---------- stat band ---------- */
.stat-band { background: var(--navy-deep); color: #e9eef5; }
.stat-band .wrap {
  display: grid; grid-template-columns: repeat(4, 1fr);
  padding-top: 30px; padding-bottom: 30px; gap: 20px;
}
.stat { text-align: left; border-left: 2px solid rgba(207,46,46,.8); padding-left: 16px; }
.stat b {
  font-family: var(--serif); font-size: clamp(24px, 3vw, 34px);
  font-weight: 900; display: block; line-height: 1.15; color: #fff;
}
.stat b small { font-size: .5em; font-weight: 700; margin-left: 2px; }
.stat span { font-size: 12.5px; color: #9fb2c8; letter-spacing: .04em; }
@media (max-width: 760px) {
  .stat-band .wrap { grid-template-columns: repeat(2, 1fr); row-gap: 26px; }
}

/* ---------- sections ---------- */
.section { padding: 72px 0 20px; }
.section-head { display: flex; align-items: baseline; justify-content: space-between; gap: 20px; margin-bottom: 34px; flex-wrap: wrap; }
.section-head .kicker {
  font-family: var(--mono); font-size: 11.5px; letter-spacing: .18em;
  text-transform: uppercase; color: var(--red); font-weight: 600;
  display: block; margin-bottom: 8px;
}
.section-head h2 {
  font-family: var(--serif); font-size: clamp(24px, 3vw, 32px);
  font-weight: 900; color: var(--ink); line-height: 1.3;
}
.section-head p { color: var(--muted); font-size: 14px; max-width: 46ch; }

/* ---------- featured ---------- */
.featured-grid { display: grid; grid-template-columns: 1.15fr .85fr; gap: 22px; }
.feature-card {
  position: relative; display: flex; flex-direction: column; justify-content: flex-end;
  min-height: 320px; border-radius: 18px; overflow: hidden;
  background: var(--navy); color: #fff; padding: 34px;
  transition: transform .25s ease, box-shadow .25s ease;
}
.feature-card:hover { transform: translateY(-4px); box-shadow: 0 22px 48px rgba(16,38,63,.28); color: #fff; }
.feature-card::after {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(200deg, rgba(207,46,46,.28), transparent 55%);
  pointer-events: none;
}
.feature-card.alt { background: #7c1f1f; }
.feature-card.alt::after { background: linear-gradient(200deg, rgba(23,54,92,.45), transparent 55%); }
.feature-tag {
  font-family: var(--mono); font-size: 11px; letter-spacing: .16em;
  text-transform: uppercase; color: #f3c1c1; margin-bottom: 14px;
  position: relative; z-index: 1;
}
.feature-card h3 {
  font-family: var(--serif); font-size: clamp(22px, 2.6vw, 30px);
  line-height: 1.35; font-weight: 900; position: relative; z-index: 1;
}
.feature-card p {
  margin-top: 12px; font-size: 14px; color: #cdd9e6; max-width: 52ch;
  position: relative; z-index: 1; line-height: 1.8;
}
.feature-card.alt p { color: #ecd4d4; }
.feature-meta {
  margin-top: 18px; font-family: var(--mono); font-size: 12px;
  color: #9fb2c8; position: relative; z-index: 1;
}
@media (max-width: 860px) { .featured-grid { grid-template-columns: 1fr; } .feature-card { min-height: 260px; } }

/* ---------- article cards ---------- */
.card-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
@media (max-width: 960px) { .card-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 620px) { .card-grid { grid-template-columns: 1fr; } }

.card {
  display: flex; flex-direction: column;
  background: #fff; border: 1px solid var(--line); border-radius: 14px;
  padding: 24px 22px 20px; position: relative;
  transition: transform .22s ease, box-shadow .22s ease, border-color .22s ease;
}
.card:hover {
  transform: translateY(-4px); border-color: var(--line-dark);
  box-shadow: 0 16px 36px rgba(23, 54, 92, .1);
}
.card-top { display: flex; justify-content: space-between; align-items: center; margin-bottom: 14px; }
.card-cat {
  font-size: 11.5px; font-weight: 700; letter-spacing: .06em;
  color: var(--red); background: rgba(207,46,46,.08);
  padding: 3px 10px; border-radius: 999px;
}
.card-no { font-family: var(--mono); font-size: 12px; color: var(--muted); }
.card h3 {
  font-family: var(--serif); font-size: 19px; font-weight: 800;
  line-height: 1.45; color: var(--ink);
}
.card:hover h3 { color: var(--navy); }
.card p {
  margin-top: 10px; font-size: 13.5px; color: var(--muted);
  line-height: 1.75; flex: 1;
}
.card-meta {
  margin-top: 16px; padding-top: 13px; border-top: 1px dashed var(--line);
  display: flex; justify-content: space-between; align-items: center;
  font-size: 12.5px; color: var(--muted);
}
.card-meta b { color: var(--ink-soft); font-weight: 600; }
.card-meta .arrow { color: var(--red); font-weight: 700; transition: transform .2s ease; }
.card:hover .arrow { transform: translateX(4px); }

/* ---------- standards strip ---------- */
.standards-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; }
.std-card {
  background: #fff; border: 1px solid var(--line); border-radius: 16px;
  padding: 32px 30px; position: relative; overflow: hidden;
}
.std-card::before {
  content: ""; position: absolute; top: 0; left: 0; right: 0; height: 4px;
  background: var(--navy);
}
.std-card.red::before { background: var(--red); }
.std-card .std-code {
  font-family: var(--mono); font-size: 12px; letter-spacing: .12em;
  color: var(--muted);
}
.std-card h3 { font-family: var(--serif); font-size: 22px; font-weight: 900; margin-top: 8px; }
.std-card ul { margin-top: 16px; list-style: none; }
.std-card li {
  font-size: 14px; color: var(--ink-soft); padding: 7px 0 7px 22px;
  position: relative; border-bottom: 1px dashed var(--line);
}
.std-card li:last-child { border-bottom: 0; }
.std-card li::before {
  content: ""; position: absolute; left: 2px; top: 15px;
  width: 8px; height: 8px; border-radius: 2px; background: var(--red);
}
@media (max-width: 760px) { .standards-grid { grid-template-columns: 1fr; } }

/* ---------- about band ---------- */
.about-band { background: var(--paper-2); border-top: 1px solid var(--line); margin-top: 72px; }
.about-band .wrap { padding-top: 60px; padding-bottom: 60px; display: grid; grid-template-columns: 1fr 1fr; gap: 48px; }
.about-band h2 { font-family: var(--serif); font-size: 26px; font-weight: 900; margin-bottom: 18px; }
.about-band p { font-size: 15px; color: var(--ink-soft); line-height: 1.95; margin-bottom: 14px; }
.about-facts { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; align-content: start; }
.fact {
  background: #fff; border: 1px solid var(--line); border-radius: 12px; padding: 18px;
}
.fact b { font-family: var(--serif); font-size: 26px; color: var(--red); display: block; line-height: 1.2; }
.fact span { font-size: 12.5px; color: var(--muted); }
@media (max-width: 860px) { .about-band .wrap { grid-template-columns: 1fr; } }

/* ---------- footer ---------- */
.site-footer {
  background: var(--navy-deep); color: #93a7bd; margin-top: 80px;
}
.site-footer .wrap { padding-top: 52px; padding-bottom: 34px; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 40px; padding-bottom: 36px; border-bottom: 1px solid rgba(255,255,255,.09); }
.site-footer h4 {
  font-family: var(--mono); font-size: 11px; letter-spacing: .16em;
  text-transform: uppercase; color: #6d8299; margin-bottom: 16px; font-weight: 600;
}
.site-footer .f-brand b { font-family: var(--serif); font-size: 19px; color: #fff; display: block; }
.site-footer .f-brand span { font-family: var(--mono); font-size: 10.5px; letter-spacing: .14em; text-transform: uppercase; color: #6d8299; display: block; margin-top: 6px; }
.site-footer .f-brand p { margin-top: 16px; font-size: 13px; line-height: 1.9; max-width: 42ch; }
.site-footer ul { list-style: none; }
.site-footer li { margin-bottom: 9px; }
.site-footer a { font-size: 13.5px; color: #b9c8d8; }
.site-footer a:hover { color: #fff; }
.footer-bottom {
  padding-top: 24px; display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap;
  font-size: 12px; color: #6d8299;
}
.footer-bottom a { color: #6d8299; }
.footer-bottom a:hover { color: #fff; }
@media (max-width: 860px) { .footer-grid { grid-template-columns: 1fr; gap: 28px; } }

/* ============================================================
   Article page
   ============================================================ */
.article-hero { border-bottom: 1px solid var(--line); padding: 52px 0 40px; background:
  radial-gradient(900px 300px at 88% -20%, rgba(23,54,92,.06), transparent 60%), var(--paper); }
.breadcrumb { font-size: 13px; color: var(--muted); margin-bottom: 26px; display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.breadcrumb a { color: var(--muted); }
.breadcrumb a:hover { color: var(--red); }
.breadcrumb .sep { color: var(--line-dark); }
.article-kicker {
  display: inline-flex; align-items: center; gap: 10px;
  font-family: var(--mono); font-size: 11.5px; letter-spacing: .16em;
  text-transform: uppercase; color: var(--red); font-weight: 600; margin-bottom: 18px;
}
.article-hero h1 {
  font-family: var(--serif); font-size: clamp(28px, 4vw, 42px);
  font-weight: 900; line-height: 1.32; max-width: 22em;
}
.article-meta {
  margin-top: 22px; display: flex; align-items: center; gap: 18px; flex-wrap: wrap;
  font-size: 13.5px; color: var(--muted);
}
.article-meta .author { display: flex; align-items: center; gap: 9px; color: var(--ink-soft); font-weight: 600; }
.avatar {
  width: 34px; height: 34px; border-radius: 50%; background: var(--navy);
  color: #fff; display: grid; place-items: center;
  font-family: var(--serif); font-size: 15px; font-weight: 700; flex: none;
}
.article-meta time, .article-meta .read-time { font-family: var(--mono); font-size: 12.5px; }

.article-body { max-width: var(--prose-w); margin: 0 auto; padding: 48px 24px 20px; }
.article-body > p {
  font-size: 16.5px; line-height: 2.02; color: var(--ink);
  margin: 0 0 1.5em; text-align: justify;
}
.article-body > p.lead, .article-body > p > strong:first-child:last-child { }
.article-body strong { font-weight: 700; color: var(--ink); }

.article-body h2 {
  font-family: var(--serif); font-size: 25px; font-weight: 900;
  margin: 2.2em 0 1em; padding-left: 16px; position: relative; line-height: 1.45;
}
.article-body h2::before {
  content: ""; position: absolute; left: 0; top: .32em; bottom: .32em;
  width: 5px; border-radius: 3px; background: var(--red);
}
.article-body h3 {
  font-family: var(--serif); font-size: 20px; font-weight: 800;
  margin: 1.9em 0 .8em; color: var(--navy);
}
.article-body h4 { font-size: 16.5px; font-weight: 700; margin: 1.6em 0 .7em; color: var(--navy); }

.sec-marker {
  display: flex; align-items: center; gap: 14px;
  margin: 3em 0 -1.1em; font-family: var(--mono);
}
.sec-marker .no {
  font-size: 13px; font-weight: 700; letter-spacing: .14em; color: var(--red);
  border: 1.5px solid var(--red); border-radius: 8px; padding: 4px 12px;
  text-transform: uppercase; white-space: nowrap;
}
.sec-marker .lbl { font-size: 12px; letter-spacing: .2em; color: var(--muted); text-transform: uppercase; }
.sec-marker::after { content: ""; flex: 1; height: 1px; background: var(--line); }

.chap-list {
  list-style: none; counter-reset: chap; margin: 0 0 2em;
  border: 1px solid var(--line); border-radius: 14px; background: #fff;
  padding: 10px 22px;
}
.chap-list li {
  counter-increment: chap; padding: 11px 0 11px 52px; position: relative;
  border-bottom: 1px dashed var(--line); font-size: 15px; color: var(--ink-soft);
}
.chap-list li:last-child { border-bottom: 0; }
.chap-list li::before {
  content: counter(chap, decimal-leading-zero);
  position: absolute; left: 4px; top: 12px;
  font-family: var(--mono); font-size: 13px; font-weight: 700; color: var(--red);
}

.article-body blockquote {
  margin: 0 0 1.6em; padding: 20px 24px;
  background: #fff; border: 1px solid var(--line); border-left: 4px solid var(--red);
  border-radius: 0 12px 12px 0;
  color: var(--ink-soft); font-size: 15.5px; line-height: 1.9;
}
.article-body blockquote p { margin: 0 0 .8em; }
.article-body blockquote p:last-child { margin: 0; }

.article-body ul, .article-body ol { margin: 0 0 1.6em; padding-left: 1.4em; }
.article-body li { margin-bottom: .55em; line-height: 1.9; font-size: 15.8px; }
.article-body li::marker { color: var(--red); font-weight: 700; }

.article-body figure { margin: 2em 0; }
.article-body figure img {
  border-radius: 12px; border: 1px solid var(--line);
  background: #fff; margin: 0 auto;
}
.article-body figcaption {
  text-align: center; font-size: 13px; color: var(--muted); margin-top: 12px;
}
.article-body figure.gallery { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.article-body figure.gallery img { width: 100%; }
.article-body figure.gallery figcaption { grid-column: 1 / -1; }
@media (max-width: 620px) { .article-body figure.gallery { grid-template-columns: 1fr; } }

.article-body figure svg { max-width: 100%; height: auto; margin: 0 auto; display: block; background: #fff; border: 1px solid var(--line); border-radius: 12px; padding: 12px; }

.article-body .cover-figure { margin: 0 0 2.2em; }
.article-body .cover-figure img { width: 100%; aspect-ratio: 16 / 8.5; object-fit: cover; }

.article-body .video-figure video {
  width: 100%; border-radius: 12px; background: #0b1622; display: block;
  border: 1px solid var(--line);
}

/* homepage photo band */
.photo-band { padding: 64px 0 8px; }
.photo-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.photo-grid figure { position: relative; border-radius: 14px; overflow: hidden; }
.photo-grid img { width: 100%; aspect-ratio: 3 / 2; object-fit: cover; transition: transform .5s ease; }
.photo-grid figure:hover img { transform: scale(1.04); }
.photo-grid figcaption {
  position: absolute; left: 0; right: 0; bottom: 0; padding: 26px 16px 12px;
  font-size: 12px; color: #fff; letter-spacing: .05em;
  background: linear-gradient(transparent, rgba(16, 28, 44, .72));
}
@media (max-width: 720px) { .photo-grid { grid-template-columns: 1fr; } }

.article-body table {
  width: 100%; border-collapse: collapse; margin: 0 0 1.8em;
  font-size: 14.5px; background: #fff; border-radius: 12px; overflow: hidden;
  border: 1px solid var(--line); display: block; overflow-x: auto;
}
.article-body th, .article-body td { padding: 11px 16px; border-bottom: 1px solid var(--line); text-align: left; line-height: 1.7; }
.article-body th { background: var(--navy); color: #fff; font-weight: 600; white-space: nowrap; }
.article-body tr:last-child td { border-bottom: 0; }

.video-card {
  display: flex; align-items: center; gap: 18px;
  background: var(--navy-deep); border-radius: 14px; padding: 24px 26px;
  margin: 0 0 1.8em; color: #dbe5ef; transition: transform .2s ease, box-shadow .2s ease;
}
.video-card:hover { transform: translateY(-3px); box-shadow: 0 16px 36px rgba(16,38,63,.3); color: #fff; }
.video-card .play {
  width: 52px; height: 52px; border-radius: 50%; flex: none;
  background: var(--red); display: grid; place-items: center;
}
.video-card .play svg { width: 20px; height: 20px; margin-left: 3px; }
.video-card b { font-size: 15.5px; display: block; color: #fff; }
.video-card span { font-size: 12.5px; color: #93a7bd; }

.expert-label {
  display: inline-block; font-family: var(--mono); font-size: 12px; font-weight: 700;
  letter-spacing: .14em; color: var(--gold); border: 1px solid var(--gold);
  border-radius: 999px; padding: 4px 14px; margin: 1.6em 0 1em;
  text-transform: uppercase;
}

.guest-card {
  background: #fff; border: 1px solid var(--line); border-radius: 14px;
  padding: 26px 28px; margin: 0 0 2em; position: relative; overflow: hidden;
}
.guest-card::before { content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 4px; background: var(--red); }

/* prev / next */
.pn-nav { max-width: var(--prose-w); margin: 30px auto 0; padding: 0 24px; display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.pn-item {
  border: 1px solid var(--line); border-radius: 12px; padding: 18px 20px;
  background: #fff; transition: all .2s ease; display: block;
}
.pn-item:hover { border-color: var(--red); transform: translateY(-2px); }
.pn-item span { font-family: var(--mono); font-size: 11px; letter-spacing: .14em; color: var(--muted); text-transform: uppercase; display: block; margin-bottom: 7px; }
.pn-item b { font-family: var(--serif); font-size: 15.5px; color: var(--ink); font-weight: 700; line-height: 1.5; }
.pn-item.next { text-align: right; }
.pn-item.disabled { opacity: .4; pointer-events: none; }
@media (max-width: 620px) { .pn-nav { grid-template-columns: 1fr; } .pn-item.next { text-align: left; } }

.back-top {
  position: fixed; right: 26px; bottom: 26px; width: 44px; height: 44px;
  border-radius: 50%; background: var(--navy); color: #fff; border: 0;
  display: grid; place-items: center; cursor: pointer; opacity: 0;
  pointer-events: none; transition: all .25s ease; z-index: 80;
  box-shadow: 0 8px 22px rgba(16,38,63,.3); font-size: 18px;
}
.back-top.show { opacity: 1; pointer-events: auto; }
.back-top:hover { background: var(--red); }

.article-note {
  max-width: var(--prose-w); margin: 40px auto 0; padding: 22px 24px;
  border: 1px dashed var(--line-dark); border-radius: 12px;
  font-size: 13px; color: var(--muted); line-height: 1.9;
  margin-left: auto; margin-right: auto;
}
@media (min-width: 800px) { .article-note { margin-left: calc((100% - var(--prose-w)) / 2); margin-right: auto; } }