:root {
  --page: #f8f7f2;
  --paper: #fffefb;
  --ink: #22272d;
  --text: #52585e;
  --muted: #7a7f83;
  --line: #ddded7;
  --line-strong: #c7c9c0;
  --green: #3f7350;
  --green-soft: #e8f0e8;
  --blue: #4b5b84;
  --blue-soft: #e9ebf3;
  --gold: #a16f23;
  --gold-soft: #f6eddc;
  --red: #9a503f;
  --red-soft: #f4e6e1;
  --max: 1120px;
  --serif: "Source Serif 4", Georgia, serif;
  --serif-zh: "Songti SC", "STSong", "Noto Serif SC", serif;
  --sans: Inter, "Avenir Next", system-ui, sans-serif;
  --mono: "DM Mono", ui-monospace, monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 11% 10%, rgba(63, 115, 80, .055), transparent 22rem),
    radial-gradient(circle at 91% 24%, rgba(75, 91, 132, .045), transparent 25rem),
    var(--page);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  opacity: .28;
  background-image: radial-gradient(rgba(34, 39, 45, .13) .65px, transparent .65px);
  background-size: 14px 14px;
  mask-image: linear-gradient(to bottom, black, transparent 72%);
}

button, input { font: inherit; }
button { color: inherit; }
a { color: inherit; }
.wrap { width: min(calc(100% - 40px), var(--max)); margin-inline: auto; }
.skip-link { position: fixed; left: 18px; top: -80px; z-index: 100; padding: 9px 13px; background: var(--ink); color: white; border-radius: 7px; }
.skip-link:focus { top: 18px; }

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  min-height: 66px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 0 max(20px, calc((100vw - var(--max)) / 2));
  border-bottom: 1px solid rgba(221, 222, 215, .86);
  background: rgba(248, 247, 242, .88);
  backdrop-filter: blur(16px);
}

.brand { display: inline-flex; gap: 10px; align-items: center; font-family: var(--serif); font-size: 20px; font-weight: 650; text-decoration: none; }
.brand-mark { display: inline-grid; place-items: center; width: 30px; height: 30px; border: 1px solid var(--line-strong); border-radius: 50%; color: var(--green); font-family: var(--mono); font-size: 16px; transform: rotate(-8deg); }
.topbar nav { display: flex; gap: 22px; font-size: 13px; font-weight: 600; color: var(--text); }
.topbar nav a { text-decoration: none; }
.topbar nav a:hover { color: var(--green); }

.intro { display: grid; grid-template-columns: 1.55fr .8fr; gap: 92px; align-items: end; padding: 80px 0 52px; }
.eyebrow, .micro-label { margin: 0 0 12px; color: var(--green); font-family: var(--mono); font-size: 11px; font-weight: 500; letter-spacing: .12em; text-transform: uppercase; }
h1 { max-width: 760px; margin: 0; font-family: var(--serif); font-size: clamp(48px, 7.4vw, 86px); font-weight: 650; letter-spacing: -.048em; line-height: .96; }
h1 em { color: var(--green); font-style: italic; font-weight: 500; }
.lede { max-width: 690px; margin: 27px 0 0; color: var(--text); font-family: var(--serif); font-size: clamp(18px, 2.1vw, 23px); line-height: 1.5; }

.garden-key { padding: 18px 0 2px 22px; border-left: 1px solid var(--line-strong); }
.garden-key > p { margin: 0 0 16px; color: var(--muted); font-family: var(--mono); font-size: 11px; letter-spacing: .08em; text-transform: uppercase; }
.garden-key ol { display: grid; gap: 10px; margin: 0; padding: 0; list-style: none; }
.garden-key li { display: grid; grid-template-columns: 10px 60px 1fr; gap: 10px; align-items: center; font-size: 12px; }
.garden-key b { font-family: var(--mono); font-weight: 500; }
.garden-key small { color: var(--muted); font-size: 11px; }
.stage-dot { width: 8px; height: 8px; border-radius: 50%; }
.stage-dot.seed { background: var(--green); }
.stage-dot.sketch { background: var(--blue); }
.stage-dot.evolving { background: var(--gold); }
.stage-dot.essay { background: var(--red); }

.garden { display: grid; grid-template-columns: 260px minmax(0, 1fr); gap: 80px; align-items: start; padding: 66px 0 112px; }
.controls { position: sticky; top: 94px; }
.control-head { display: flex; justify-content: space-between; align-items: start; gap: 16px; padding-bottom: 20px; border-bottom: 1px solid var(--line); }
.control-head p { margin: 0; color: var(--text); font-family: var(--serif); font-size: 20px; font-weight: 650; }
.quiet-button, .clear-button, .back-button { border: 0; background: transparent; cursor: pointer; }
.quiet-button { margin-top: 2px; padding: 4px 0; color: var(--green); font-family: var(--mono); font-size: 11px; }
.quiet-button:hover { text-decoration: underline; text-underline-offset: 4px; }

.search-field { display: grid; gap: 7px; padding: 22px 0 20px; border-bottom: 1px solid var(--line); }
.search-field span, fieldset legend { color: var(--muted); font-family: var(--mono); font-size: 10px; letter-spacing: .09em; text-transform: uppercase; }
.search-field input { width: 100%; min-height: 41px; padding: 8px 0; border: 0; border-bottom: 1px solid var(--line-strong); outline: none; color: var(--ink); background: transparent; font-size: 13px; }
.search-field input:focus { border-color: var(--green); }
.search-field input::placeholder { color: #999d99; }
fieldset { min-width: 0; margin: 0; padding: 20px 0 0; border: 0; }
fieldset legend { margin-bottom: 12px; }
.filter-row { display: flex; flex-wrap: wrap; gap: 7px; }
.filter-button, .tag-button { border: 1px solid var(--line); background: rgba(255,255,255,.35); cursor: pointer; transition: border-color 150ms ease, background 150ms ease, color 150ms ease; }
.filter-button { padding: 5px 9px; border-radius: 999px; font-family: var(--mono); font-size: 10px; }
.filter-button:hover, .tag-button:hover { border-color: var(--line-strong); }
.filter-button[aria-pressed="true"] { border-color: var(--ink); color: white; background: var(--ink); }
.tag-list { display: grid; gap: 3px; }
.tag-button { display: flex; justify-content: space-between; width: 100%; padding: 6px 8px; border-color: transparent; border-radius: 6px; color: var(--text); background: transparent; text-align: left; font-size: 12px; }
.tag-button span { color: var(--muted); font-family: var(--mono); font-size: 10px; }
.tag-button[aria-pressed="true"] { color: var(--green); background: var(--green-soft); }
.clear-button { margin-top: 18px; padding: 0; color: var(--red); font-family: var(--mono); font-size: 10px; text-decoration: underline; text-underline-offset: 4px; }

.stream { position: relative; min-height: 400px; }
.stream::before { content: ""; position: absolute; left: 7px; top: 12px; bottom: 40px; width: 1px; background: linear-gradient(var(--line-strong), var(--line), transparent); }
.thought-card { position: relative; margin-left: 0; padding: 0 0 64px 52px; }
.timeline-node { position: absolute; left: 1px; top: 8px; z-index: 1; width: 13px; height: 13px; border: 3px solid var(--page); border-radius: 50%; background: var(--green); box-shadow: 0 0 0 1px var(--green); }
.thought-card[data-maturity="sketch"] .timeline-node { background: var(--blue); box-shadow: 0 0 0 1px var(--blue); }
.thought-card[data-maturity="evolving"] .timeline-node { background: var(--gold); box-shadow: 0 0 0 1px var(--gold); }
.thought-card[data-maturity="essay"] .timeline-node { background: var(--red); box-shadow: 0 0 0 1px var(--red); }
.card-meta { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; min-height: 25px; margin-bottom: 13px; font-family: var(--mono); font-size: 10px; }
.card-meta time { color: var(--muted); }
.maturity-badge { padding: 3px 7px; border-radius: 999px; }
.maturity-badge { color: var(--green); background: var(--green-soft); }
[data-maturity="sketch"] .maturity-badge { color: var(--blue); background: var(--blue-soft); }
[data-maturity="evolving"] .maturity-badge { color: var(--gold); background: var(--gold-soft); }
[data-maturity="essay"] .maturity-badge { color: var(--red); background: var(--red-soft); }
.thought-card h2 { max-width: 710px; margin: 0; font-family: var(--serif); font-size: clamp(29px, 4vw, 43px); letter-spacing: -.028em; line-height: 1.08; }
.thought-link { padding: 0; border: 0; background: transparent; text-align: left; cursor: pointer; }
.thought-link:hover { color: var(--green); }
.excerpt { max-width: 710px; margin: 16px 0 0; color: var(--text); font-family: var(--serif); font-size: 17px; line-height: 1.7; }
.card-foot { display: flex; justify-content: space-between; gap: 24px; align-items: end; max-width: 710px; margin-top: 19px; }
.card-tags { display: flex; flex-wrap: wrap; gap: 8px; margin: 0; padding: 0; list-style: none; color: var(--muted); font-family: var(--mono); font-size: 10px; }
.card-tags li::before { content: "#"; color: var(--green); }
.read-link { flex: none; padding: 0; border: 0; border-bottom: 1px solid var(--line-strong); background: transparent; cursor: pointer; color: var(--ink); font-family: var(--mono); font-size: 10px; }
.read-link:hover { color: var(--green); border-color: var(--green); }
.empty-state { margin: 18px 0 0 52px; padding: 30px; border: 1px dashed var(--line-strong); color: var(--muted); background: rgba(255,255,255,.28); }
.empty-state h2 { margin: 0 0 8px; color: var(--ink); font-family: var(--serif); font-size: 28px; }
.empty-state p { margin: 0; font-size: 13px; }

.thought-view { padding: 62px 0 112px; }
.reading-wrap { max-width: 900px; }
.back-button { margin: 0 0 46px; padding: 0; color: var(--green); font-family: var(--mono); font-size: 11px; }
.back-button:hover { text-decoration: underline; text-underline-offset: 4px; }
.article-meta { display: flex; flex-wrap: wrap; gap: 9px; align-items: center; margin-bottom: 18px; font-family: var(--mono); font-size: 10px; }
.article-meta time { color: var(--muted); }
.article-language-switch { display: inline-flex; gap: 3px; margin: 0 0 22px; padding: 3px; border: 1px solid var(--line); border-radius: 999px; background: rgba(255,255,255,.42); }
.article-language-switch button { min-width: 68px; padding: 5px 11px; border: 0; border-radius: 999px; color: var(--muted); background: transparent; cursor: pointer; font-family: var(--sans); font-size: 11px; transition: color 150ms ease, background 150ms ease, box-shadow 150ms ease; }
.article-language-switch button:hover { color: var(--ink); }
.article-language-switch button[aria-pressed="true"] { color: white; background: var(--ink); box-shadow: 0 1px 3px rgba(34,39,45,.18); }
.thought-view h1 { max-width: 820px; font-size: clamp(45px, 7vw, 78px); text-wrap: balance; }
.article-excerpt { max-width: 750px; margin: 24px 0 0; color: var(--text); font-family: var(--serif); font-size: 21px; line-height: 1.55; }
.article-tags { display: flex; flex-wrap: wrap; gap: 8px; margin: 24px 0 50px; padding: 0 0 28px; border-bottom: 1px solid var(--line); list-style: none; color: var(--muted); font-family: var(--mono); font-size: 10px; }
.article-tags li::before { content: "#"; color: var(--green); }
.article-body { max-width: 700px; font-family: var(--serif); font-size: 18px; line-height: 1.82; }
.article-body h2 { margin: 2.2em 0 .6em; font-size: 28px; line-height: 1.2; }
.article-body p, .article-body ul, .article-body blockquote { margin: 0 0 1.25em; }
.article-body ul { padding-left: 1.2em; }
.article-body blockquote { margin-left: 0; padding: 5px 0 5px 22px; border-left: 2px solid var(--green); color: var(--text); font-style: italic; }
.math-display { max-width: 100%; margin: .35em 0 1.55em; overflow-x: auto; overflow-y: hidden; }
.math-display .katex-display { margin: 0; padding: .25em 0; }
.article-body .katex { font-size: 1.02em; }
.article-body a { color: var(--green); text-underline-offset: 3px; }
#thought-article[lang="zh"] h1,
#thought-article[lang="zh"] .article-excerpt,
#thought-article[lang="zh"] .article-body { font-family: var(--serif-zh); }
.connections-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 44px; margin-top: 72px; padding-top: 30px; border-top: 1px solid var(--line-strong); }
.connection-list { display: grid; gap: 9px; }
.connection-link, .connection-empty { min-height: 65px; padding: 11px 13px; border: 1px solid var(--line); border-radius: 8px; background: rgba(255,255,255,.34); }
.connection-link { display: grid; grid-template-columns: 1fr auto; align-items: center; gap: 14px; text-decoration: none; font-family: var(--serif); font-size: 16px; }
.connection-link small { color: var(--muted); font-family: var(--mono); font-size: 9px; }
.connection-link:hover { border-color: var(--green); color: var(--green); }
.connection-empty { display: flex; align-items: center; color: var(--muted); font-size: 12px; }

.site-footer { display: flex; justify-content: space-between; gap: 20px; padding: 28px 0 40px; border-top: 1px solid var(--line); color: var(--muted); font-family: var(--serif); font-size: 13px; }
.site-footer p { margin: 0; font-style: italic; }
.site-footer div { display: flex; gap: 18px; font-family: var(--mono); font-size: 10px; }
.site-footer a { text-decoration: none; }
.site-footer a:hover { color: var(--green); }

body.detail-open .intro,
body.detail-open .garden { display: none; }

@media (max-width: 820px) {
  .intro { grid-template-columns: 1fr; gap: 42px; padding-top: 58px; }
  .garden-key { max-width: 460px; }
  .garden { grid-template-columns: 1fr; gap: 50px; }
  .controls { position: static; display: grid; grid-template-columns: 1fr 1fr; gap: 0 26px; }
  .control-head { grid-column: 1 / -1; }
  .search-field { grid-column: 1 / -1; }
  .tag-filter { max-height: 215px; overflow: auto; }
  .clear-button { justify-self: start; }
}

@media (max-width: 560px) {
  .wrap { width: min(calc(100% - 28px), var(--max)); }
  .topbar { min-height: 60px; padding-inline: 14px; }
  .brand { font-size: 17px; }
  .brand-mark { width: 26px; height: 26px; }
  .topbar nav a:first-child { display: none; }
  .intro { padding-top: 46px; }
  h1 { font-size: clamp(44px, 14vw, 62px); }
  .lede { font-size: 18px; }
  .garden { padding-top: 46px; }
  .controls { display: block; }
  .thought-card { padding-left: 34px; padding-bottom: 52px; }
  .stream::before { left: 5px; }
  .timeline-node { left: 0; width: 11px; height: 11px; }
  .card-foot { align-items: start; flex-direction: column; gap: 14px; }
  .thought-card h2 { font-size: 31px; }
  .excerpt { font-size: 16px; }
  .thought-view { padding-top: 42px; }
  .connections-grid { grid-template-columns: 1fr; }
  .site-footer { flex-direction: column; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
}