:root {
  --paper: #f5f1e8;
  --paper-deep: #e9e1d3;
  --ink: #1c1a17;
  --muted: #696158;
  --line: rgba(28, 26, 23, .18);
  --red: #7b2f27;
  --coffee: #4b382c;
  --white: #fffdf8;
  --serif: "Noto Serif SC", "Songti SC", "STSong", "SimSun", serif;
  --sans: "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 6rem; }
body { margin: 0; overflow-x: clip; color: var(--ink); background: var(--paper); font: 400 1rem/1.8 var(--sans); }
a { color: inherit; }
button { font: inherit; }
.skip-link { position: fixed; left: 1rem; top: -6rem; z-index: 100; padding: .6rem 1rem; color: var(--white); background: var(--ink); }
.skip-link:focus { top: 1rem; }

.site-header { position: sticky; top: 0; z-index: 20; display: flex; align-items: center; justify-content: space-between; min-height: 5rem; padding: .8rem clamp(1.25rem, 4vw, 4rem); border-bottom: 1px solid var(--line); background: rgba(245, 241, 232, .94); backdrop-filter: blur(12px); }
.brand { display: flex; flex-direction: column; text-decoration: none; line-height: 1.25; }
.brand-kicker { color: var(--muted); font-size: .75rem; letter-spacing: .13em; }
.brand-name { font: 600 1.25rem/1.5 var(--serif); letter-spacing: .18em; }
.site-nav { display: flex; gap: clamp(1rem, 2.6vw, 2.4rem); }
.site-nav a, .back-link { color: var(--muted); font-size: .9rem; text-decoration: none; }
.site-nav a:hover, .site-nav a:focus-visible, .back-link:hover { color: var(--red); }
.menu-button { display: none; padding: .45rem .8rem; border: 1px solid var(--line); color: var(--ink); background: transparent; }

main { width: min(100%, 90rem); margin: 0 auto; }
.hero { position: relative; display: grid; grid-template-columns: minmax(0, 1fr) auto; align-items: center; min-height: clamp(34rem, 78vh, 51rem); padding: clamp(4rem, 10vw, 9rem) clamp(1.25rem, 8vw, 8rem); overflow: hidden; border-bottom: 1px solid var(--line); }
.hero::before { content: ""; position: absolute; inset: 12% 0 auto 46%; height: 1px; background: var(--line); transform: rotate(-42deg); transform-origin: left; }
.hero-copy { position: relative; z-index: 1; min-width: 0; max-width: 49rem; }
.eyebrow { margin: 0 0 2rem; color: var(--red); font: 600 .74rem/1.4 var(--sans); letter-spacing: .24em; }
.hero h1 { margin: 0; font: 500 clamp(3rem, 8vw, 7.25rem)/1.05 var(--serif); letter-spacing: -.04em; }
.hero h1 span { display: block; }
.hero-intro { max-width: 34rem; margin: 2.2rem 0 1.5rem; color: var(--muted); font-size: 1.04rem; }
.text-link { display: inline-block; padding-bottom: .15rem; border-bottom: 1px solid var(--ink); text-decoration: none; }
.hero-mark { position: relative; display: grid; gap: .08em; padding: .9rem .75rem; color: var(--white); background: var(--red); font: 500 clamp(1.1rem, 2vw, 1.55rem)/1.1 var(--serif); box-shadow: 0 1rem 2.8rem rgba(76, 40, 31, .15); }
.hero-note { position: absolute; right: clamp(1.25rem, 8vw, 8rem); bottom: 2.2rem; margin: 0; color: var(--muted); font-size: .75rem; letter-spacing: .1em; text-align: right; }

.section { padding: clamp(4rem, 9vw, 8rem) clamp(1.25rem, 8vw, 8rem); border-bottom: 1px solid var(--line); }
.section-heading { display: grid; grid-template-columns: 5rem 1fr; margin-bottom: 3rem; }
.section-heading.compact { margin-bottom: 2rem; }
.section-number { margin: .2rem 0 0; color: var(--red); font: 600 .8rem/1 var(--sans); letter-spacing: .14em; }
.section-heading h2, .contact-section h2 { margin: 0; font: 500 clamp(2.2rem, 4.8vw, 4rem)/1.2 var(--serif); }
.section-heading p:not(.section-number), .contact-section p { max-width: 35rem; margin: .7rem 0 0; color: var(--muted); }

.material-grid { display: grid; grid-template-columns: repeat(12, 1fr); border-top: 1px solid var(--line); border-left: 1px solid var(--line); }
.material-card { grid-column: span 4; display: flex; flex-direction: column; min-height: 16rem; padding: 1.5rem; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); text-decoration: none; transition: background .2s ease, color .2s ease; }
.material-card.featured { grid-column: span 8; min-height: 20rem; background: var(--coffee); color: var(--white); }
a.material-card:hover, a.material-card:focus-visible { background: var(--red); color: var(--white); outline: none; }
.material-index { font-size: .72rem; letter-spacing: .16em; opacity: .72; }
.material-name { margin-top: auto; font: 500 clamp(1.8rem, 4vw, 3rem)/1.25 var(--serif); }
.material-latin { margin-top: .35rem; font: italic .8rem/1.4 Georgia, serif; opacity: .66; }
.material-desc, .status { margin-top: 1.2rem; font-size: .86rem; opacity: .78; }
.material-card.pending { min-height: 12rem; background: rgba(255, 253, 248, .28); }

.topic-section { background: var(--white); }
.topic-list { margin: 0; padding: 0; list-style: none; counter-reset: topics; border-top: 1px solid var(--line); }
.topic-list li { counter-increment: topics; display: grid; grid-template-columns: 4rem minmax(12rem, .6fr) 1fr; gap: 1rem; align-items: baseline; padding: 1.35rem 0; border-bottom: 1px solid var(--line); }
.topic-list li::before { content: "0" counter(topics); color: var(--red); font-size: .72rem; letter-spacing: .12em; }
.topic-list span { font: 500 1.25rem/1.5 var(--serif); }
.topic-list em { color: var(--muted); font-style: normal; font-size: .9rem; }
.section-status { margin: 1.5rem 0 0 4.9rem; color: var(--muted); font-size: .82rem; }

.two-column { display: grid; grid-template-columns: 1fr 1fr; }
.two-column .section:first-child { border-right: 1px solid var(--line); }
.mini-section { padding-inline: clamp(1.25rem, 5vw, 5rem); }
.mini-section .section-heading { grid-template-columns: 3rem 1fr; }
.plain-list { margin: 0; padding: 0; list-style: none; border-top: 1px solid var(--line); }
.plain-list li { padding: 1rem .2rem; border-bottom: 1px solid var(--line); }
details { border-top: 1px solid var(--line); }
details:last-of-type { border-bottom: 1px solid var(--line); }
summary { padding: 1rem 2rem 1rem .2rem; cursor: pointer; font-weight: 500; }
details p { margin: 0 0 1.2rem; color: var(--muted); }

.about-section { background: var(--coffee); color: var(--white); }
.about-section .section-number { color: #d6a098; }
.about-section .section-heading p:not(.section-number) { color: rgba(255,255,255,.65); }
.about-grid { display: grid; grid-template-columns: repeat(3, 1fr); border-top: 1px solid rgba(255,255,255,.2); border-left: 1px solid rgba(255,255,255,.2); }
.about-grid article { min-height: 14rem; padding: 1.6rem; border-right: 1px solid rgba(255,255,255,.2); border-bottom: 1px solid rgba(255,255,255,.2); }
.about-grid h3 { margin: 0; font: 500 1.45rem/1.4 var(--serif); }
.about-grid p { color: rgba(255,255,255,.72); }

.contact-section { display: grid; grid-template-columns: 5rem 1fr auto; gap: 1rem; align-items: start; padding: clamp(4rem, 9vw, 7rem) clamp(1.25rem, 8vw, 8rem); }
.contact-status { padding: .35rem .7rem; border: 1px solid var(--line); color: var(--muted); font-size: .78rem; }
.site-footer { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 1rem; padding: 2rem clamp(1.25rem, 4vw, 4rem); color: var(--muted); background: var(--ink); font-size: .78rem; }
.site-footer p { margin: 0; }
.site-footer p:nth-child(2) { text-align: center; }
.site-footer .copyright { text-align: right; }

.article-header { position: relative; }
.article-shell { width: min(100% - 2.5rem, 54rem); margin: 0 auto; padding: clamp(4rem, 9vw, 8rem) 0; }
.article-content h1 { margin: 0 0 1.5rem; font: 500 clamp(2.8rem, 8vw, 5.5rem)/1.15 var(--serif); }
.article-content h2 { margin: 3.5rem 0 1.1rem; padding-top: 1.2rem; border-top: 1px solid var(--line); font: 500 clamp(1.65rem, 4vw, 2.3rem)/1.35 var(--serif); }
.article-content h3 { margin-top: 2.4rem; font: 500 1.3rem/1.4 var(--serif); }
.article-content p, .article-content li { color: #3f3a34; }
.article-content p { margin: 0 0 1.25rem; }
.article-content ul { padding-left: 1.3rem; }
.article-content blockquote { margin: 2rem 0; padding: 1rem 1.4rem; border-left: 3px solid var(--red); color: var(--coffee); background: rgba(123, 47, 39, .055); font-family: var(--serif); }
.article-notice { margin-top: 4rem; padding: 1.4rem; border: 1px solid var(--line); color: var(--muted); font-size: .88rem; }
.article-notice p { margin: .5rem 0 0; }
.article-nav { display: flex; justify-content: space-between; margin-top: 2rem; }
.article-nav a { color: var(--red); text-underline-offset: .25rem; }

@media (max-width: 780px) {
  .site-header { min-height: 4.5rem; }
  .menu-button { display: block; }
  .site-nav { position: absolute; inset: 100% 0 auto; display: none; flex-direction: column; gap: 0; padding: .6rem 1.25rem 1rem; border-bottom: 1px solid var(--line); background: var(--paper); }
  .site-nav.is-open { display: flex; }
  .site-nav a { padding: .72rem 0; border-bottom: 1px solid var(--line); }
  .hero { grid-template-columns: 1fr; align-items: start; min-height: 40rem; padding-top: 5rem; }
  .hero h1 { max-width: 100%; font-size: clamp(3rem, 14vw, 4.3rem); line-height: 1.1; overflow-wrap: anywhere; }
  .hero-intro { max-width: 100%; }

  .hero-mark { position: absolute; right: 1.25rem; bottom: 4.5rem; }
  .section-heading { grid-template-columns: 3rem 1fr; }
  .material-card, .material-card.featured { grid-column: span 12; min-height: 12rem; }
  .material-card.featured { min-height: 16rem; }
  .topic-list li { grid-template-columns: 2.2rem 1fr; }
  .topic-list em { grid-column: 2; }
  .section-status { margin-left: 3.2rem; }
  .two-column { grid-template-columns: 1fr; }
  .two-column .section:first-child { border-right: 0; }
  .about-grid { grid-template-columns: 1fr; }
  .about-grid article { min-height: auto; }
  .contact-section { grid-template-columns: 3rem 1fr; }
  .contact-status { grid-column: 2; justify-self: start; }
  .site-footer { grid-template-columns: 1fr; }
  .site-footer p:nth-child(2), .site-footer .copyright { text-align: left; }
  .back-link { font-size: .8rem; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: .01ms !important; }
}