:root {
  --paper: #f4f1e9;
  --paper-deep: #ebe6da;
  --ink: #1d2721;
  --muted: #637068;
  --line: #d9d4c7;
  --green: #244c3b;
  --green-soft: #dce7dc;
  --acid: #d8f36a;
  --orange: #d77943;
  --card: #fbfaf5;
  --mono: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  --serif: "Noto Serif SC", "Songti SC", Georgia, serif;
  --sans: "Avenir Next", "PingFang SC", "Microsoft YaHei", sans-serif;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--paper); color: var(--ink); font-family: var(--sans); line-height: 1.75; }
a { color: inherit; }
.wrap { width: min(1120px, calc(100% - 48px)); margin: 0 auto; }
.site-head { border-bottom: 1px solid var(--line); background: rgba(244,241,233,.92); position: sticky; top: 0; z-index: 5; backdrop-filter: blur(14px); }
.head-inner { min-height: 76px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand { display: flex; align-items: center; gap: 11px; text-decoration: none; }
.brand-mark { width: 35px; height: 35px; display: grid; place-items: center; border-radius: 10px; background: var(--green); color: var(--acid); font: 800 16px var(--mono); }
.brand b { display: block; font: 800 14px var(--sans); letter-spacing: .06em; }
.brand span { display: block; color: var(--muted); font: 9px var(--mono); letter-spacing: .14em; margin-top: 1px; }
.nav { display: flex; align-items: center; gap: 22px; }
.nav a { text-decoration: none; color: var(--muted); font-size: 12px; font-weight: 700; }
.nav a:hover, .nav a.active { color: var(--green); }
.nav .nav-cta { padding: 7px 12px; border: 1px solid var(--green); border-radius: 99px; color: var(--green); }
.hero { padding: 72px 0 54px; border-bottom: 1px solid var(--line); }
.hero-top { display: flex; justify-content: space-between; align-items: flex-start; gap: 30px; }
.kicker { color: var(--orange); font: 700 10px var(--mono); letter-spacing: .18em; text-transform: uppercase; }
.hero h1 { margin: 15px 0 20px; max-width: 760px; font: 800 clamp(42px, 7vw, 82px)/1.02 var(--serif); letter-spacing: -.055em; }
.hero h1 em { color: var(--green); font-style: normal; }
.hero-desc { max-width: 620px; margin: 0; color: var(--muted); font-size: 14px; line-height: 1.9; }
.hero-note { flex: 0 0 180px; margin-top: 48px; padding-left: 17px; border-left: 2px solid var(--acid); color: var(--muted); font: 10px/1.8 var(--mono); }
.hero-note b { display: block; color: var(--green); margin-bottom: 3px; }
.hero-stats { display: flex; gap: 28px; flex-wrap: wrap; margin-top: 34px; }
.hero-stats span { color: var(--muted); font: 10px var(--mono); }
.hero-stats b { color: var(--green); font-size: 17px; margin-right: 4px; }
.section { padding: 46px 0; }
.section-head { display: flex; align-items: end; justify-content: space-between; gap: 20px; margin-bottom: 20px; }
.section-head h2 { margin: 0; font: 800 25px/1.25 var(--serif); letter-spacing: -.03em; }
.section-head p { margin: 5px 0 0; color: var(--muted); font-size: 11px; }
.section-head .section-no { color: var(--muted); font: 10px var(--mono); }
.featured { display: grid; grid-template-columns: 1.3fr .7fr; gap: 0; border: 1px solid var(--line); background: var(--card); border-radius: 16px; overflow: hidden; }
.featured-main { padding: 28px; }
.featured-main .post-tag { margin-bottom: 13px; }
.featured-main h3 { margin: 0 0 10px; font: 800 30px/1.35 var(--serif); letter-spacing: -.035em; }
.featured-main h3 a { text-decoration: none; }
.featured-main h3 a:hover { color: var(--green); }
.featured-main p { margin: 0; max-width: 560px; color: var(--muted); font-size: 12px; line-height: 1.85; }
.featured-side { padding: 25px; border-left: 1px solid var(--line); background: var(--green); color: #edf3e8; }
.featured-side .side-label { color: #afc2ad; font: 9px var(--mono); letter-spacing: .12em; }
.featured-side h4 { margin: 9px 0 12px; font: 700 18px/1.45 var(--serif); }
.featured-side p { margin: 0; color: #bfd0bc; font-size: 10px; line-height: 1.8; }
.featured-side .side-link { display: inline-flex; margin-top: 15px; color: var(--acid); font: 700 10px var(--mono); text-decoration: none; }
.post-list { display: grid; gap: 0; border-top: 1px solid var(--line); }
.post-row { display: grid; grid-template-columns: 74px minmax(0, 1fr) auto; gap: 18px; padding: 19px 4px; border-bottom: 1px solid var(--line); align-items: start; text-decoration: none; transition: padding .2s, background .2s; }
.post-row:hover { padding-left: 10px; background: rgba(220,231,220,.35); }
.post-no { color: var(--orange); font: 700 11px var(--mono); padding-top: 4px; }
.post-copy h3 { margin: 0; font: 700 18px/1.45 var(--serif); }
.post-copy p { margin: 5px 0 0; color: var(--muted); font-size: 11px; line-height: 1.7; }
.post-meta { display: flex; gap: 10px; margin-top: 7px; color: var(--muted); font: 9px var(--mono); }
.post-arrow { color: var(--green); font-size: 20px; padding-top: 5px; }
.principles { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; }
.principle { padding: 17px; border: 1px solid var(--line); border-radius: 12px; background: var(--card); }
.principle .p-no { color: var(--orange); font: 700 10px var(--mono); }
.principle h3 { margin: 8px 0 5px; font: 700 14px var(--sans); }
.principle p { margin: 0; color: var(--muted); font-size: 10px; line-height: 1.8; }
.site-foot { margin-top: 36px; border-top: 1px solid var(--line); padding: 22px 0 32px; }
.foot-inner { display: flex; justify-content: space-between; gap: 24px; flex-wrap: wrap; color: var(--muted); font-size: 10px; }
.foot-links { display: flex; gap: 16px; }
.foot-links a { text-decoration: none; }
.legal { margin-top: 12px; color: var(--muted); font-size: 9px; line-height: 1.9; }
.legal a { text-decoration: underline; text-underline-offset: 3px; }

/* article */
.article-wrap { width: min(760px, calc(100% - 48px)); margin: 0 auto; padding: 46px 0 30px; }
.article-back { color: var(--muted); font: 10px var(--mono); text-decoration: none; }
.article-back:hover { color: var(--green); }
.article-kicker { margin-top: 26px; }
.article-wrap h1 { margin: 12px 0 15px; font: 800 clamp(32px, 5vw, 48px)/1.15 var(--serif); letter-spacing: -.045em; }
.article-lead { margin: 0; color: var(--muted); font-size: 14px; line-height: 1.9; }
.article-meta { display: flex; gap: 14px; flex-wrap: wrap; margin: 18px 0 25px; padding-bottom: 15px; border-bottom: 1px solid var(--line); color: var(--muted); font: 9px var(--mono); }
.article-body { font-size: 14px; line-height: 1.95; }
.article-body h2 { margin: 34px 0 12px; font: 800 23px/1.4 var(--serif); letter-spacing: -.025em; }
.article-body h3 { margin: 25px 0 8px; font: 700 16px/1.5 var(--sans); }
.article-body p { margin: 0 0 14px; }
.article-body ul, .article-body ol { margin: 0 0 16px; padding-left: 22px; }
.article-body li { margin: 5px 0; }
.article-body strong { color: var(--green); }
.article-body a { color: var(--green); text-underline-offset: 3px; }
.article-body code { padding: 1px 5px; border-radius: 4px; background: var(--paper-deep); font: 11px var(--mono); }
.article-body pre { margin: 18px 0; padding: 17px; overflow: auto; border-radius: 10px; background: #1d2721; color: #dce7dc; font: 11px/1.75 var(--mono); }
.article-body pre code { padding: 0; background: none; color: inherit; }
.callout { margin: 23px 0; padding: 16px 18px; border-left: 3px solid var(--acid); border-radius: 0 9px 9px 0; background: var(--green-soft); }
.callout b { display: block; color: var(--green); margin-bottom: 3px; font-size: 11px; }
.callout p { margin: 0; color: #52665a; font-size: 11px; line-height: 1.8; }
.diagram { display: grid; grid-template-columns: repeat(4, 1fr); gap: 7px; margin: 20px 0; }
.diagram div { padding: 13px 8px; border: 1px solid var(--line); border-radius: 8px; background: var(--card); text-align: center; }
.diagram b { display: block; color: var(--green); font-size: 11px; }
.diagram span { display: block; color: var(--muted); font-size: 9px; margin-top: 3px; }
.article-next { margin-top: 32px; padding-top: 16px; border-top: 1px solid var(--line); display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; }
.article-next a { color: var(--green); font-size: 11px; text-decoration: none; }
.article-next span { color: var(--muted); font-size: 9px; font-family: var(--mono); }
@media (max-width: 760px) {
  .wrap, .article-wrap { width: min(100% - 28px, 1120px); }
  .head-inner { min-height: 64px; }
  .nav { gap: 13px; }
  .nav a:not(.nav-cta) { display: none; }
  .hero { padding: 42px 0 30px; }
  .hero h1 { margin-top: 11px; }
  .hero-top { display: block; }
  .hero-note { margin-top: 24px; max-width: 250px; }
  .featured { grid-template-columns: 1fr; }
  .featured-side { border-left: 0; border-top: 1px solid var(--line); }
  .featured-main { padding: 20px; }
  .featured-main h3 { font-size: 23px; }
  .post-row { grid-template-columns: 46px minmax(0, 1fr); gap: 10px; }
  .post-arrow { display: none; }
  .principles { grid-template-columns: 1fr; }
  .diagram { grid-template-columns: repeat(2, 1fr); }
}