:root {
  color-scheme: light;
  --bg: #f7f9fc;
  --surface: #fff;
  --text: #243047;
  --muted: #69768b;
  --line: #dfe6f0;
  --accent: #315f9e;
  --soft: #e9f0fa;
  --header: rgb(247 249 252 / 92%);
  --radius: 18px;
}
:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #141b29;
  --surface: #1c2638;
  --text: #e6edf8;
  --muted: #a2b0c6;
  --line: #303e55;
  --accent: #9ebff0;
  --soft: #253650;
  --header: rgb(20 27 41 / 92%);
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 100px; }
body { margin: 0; background: var(--bg); color: var(--text); font: 15px/1.7 -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif; -webkit-font-smoothing: antialiased; }
a { color: inherit; text-decoration: none; }
button, input { font: inherit; }
button, a, input { -webkit-tap-highlight-color: transparent; }
button { cursor: pointer; }
button:disabled { cursor: default; }
button, input { color: inherit; }
button { border: 0; }
svg { width: 20px; height: 20px; fill: none; stroke: currentColor; stroke-width: 1.6; stroke-linecap: round; stroke-linejoin: round; flex-shrink: 0; }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 5px; }
::selection { background: #cbdcf6; color: #203553; }
[hidden] { display: none !important; }
.container { width: min(1160px, calc(100% - 80px)); margin-inline: auto; }
.skip-link { position: fixed; top: -100px; left: 20px; z-index: 100; padding: 10px 20px; background: var(--surface); }
.skip-link:focus { top: 12px; }
.site-header { position: sticky; top: 0; z-index: 20; background: var(--header); backdrop-filter: blur(18px); border-bottom: 1px solid var(--line); }
.header-inner { height: 82px; display: flex; align-items: center; gap: 36px; }
.brand { display: flex; align-items: center; gap: 11px; font-size: 19px; font-weight: 750; letter-spacing: -.7px; }
.brand-mark { display: grid; place-items: center; background: var(--accent); color: var(--bg); width: 35px; height: 35px; border-radius: 10px; font: 700 18px/1 monospace; letter-spacing: -3px; padding-right: 3px; }
.brand small { margin-left: 1px; font-size: 10px; font-weight: 500; color: var(--muted); letter-spacing: 2px; }
.main-nav { display: flex; align-items: center; gap: 31px; margin-left: auto; height: 100%; }
.main-nav a { display: flex; align-items: center; height: 100%; color: var(--muted); font-size: 13px; position: relative; }
.main-nav a:hover, .main-nav a.active { color: var(--accent); }
.main-nav a.active::after { content: ""; position: absolute; bottom: 17px; left: 50%; width: 4px; height: 4px; border-radius: 50%; background: var(--accent); }
.header-tools { display: flex; align-items: center; gap: 9px; padding-left: 24px; border-left: 1px solid var(--line); }
.icon-button { display: grid; place-items: center; width: 36px; height: 36px; background: transparent; border-radius: 50%; color: var(--muted); }
.icon-button:hover { background: var(--soft); color: var(--accent); }
.menu-toggle { display: none; }
.hero { display: grid; grid-template-columns: 1.15fr 1fr; align-items: center; gap: 75px; padding-block: 70px 67px; }
.eyebrow { display: flex; align-items: center; gap: 9px; color: var(--accent); font: 11px/1.5 ui-monospace, SFMono-Regular, Consolas, monospace; letter-spacing: 2px; }
.status-dot { width: 6px; height: 6px; border-radius: 50%; background: currentColor; box-shadow: 0 0 0 4px var(--soft); }
h1 { margin: 22px 0 19px; font-size: clamp(34px, 4.1vw, 55px); line-height: 1.4; letter-spacing: -2px; font-weight: 750; }
h1 span { color: var(--accent); }
.hero-copy > p { max-width: 410px; color: var(--muted); margin: 0; font-size: 14px; line-height: 2; }
.hero-actions { display: flex; align-items: center; gap: 28px; margin-top: 29px; font-size: 13px; }
.primary-link { display: inline-flex; align-items: center; justify-content: center; gap: 24px; background: var(--accent); color: var(--bg); padding: 12px 21px; border-radius: 8px; transition: transform .2s; }
.primary-link:hover { transform: translateY(-3px); }
.text-link { display: inline-flex; align-items: center; gap: 7px; color: var(--muted); }
.text-link:hover { color: var(--accent); }
.hero-visual { position: relative; height: 304px; margin: 0; border-radius: 90px 16px 16px 16px; overflow: hidden; background: #1e3450; }
.hero-visual img { width: 100%; height: 100%; object-fit: cover; object-position: 67% center; }
.hero-visual::after { content: ""; position: absolute; inset: 0; background: linear-gradient(0deg, #071c25b8, transparent 65%); }
.visual-note { position: absolute; inset: auto 26px 23px; z-index: 1; color: white; display: flex; align-items: end; justify-content: space-between; }
.visual-note small { font: 9px/1.5 monospace; letter-spacing: 2px; opacity: .7; }
.visual-note p { margin: 4px 0 0; font-size: 15px; letter-spacing: 2px; }
.visual-note > span { font-size: 29px; line-height: 1; }
.hero-bottom { display: flex; align-items: center; justify-content: space-between; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); padding: 15px 0; color: var(--muted); font-size: 11px; }
.hero-bottom p { margin: 0; display: flex; align-items: center; gap: 9px; }
.hero-bottom svg { width: 15px; height: 15px; }
.hero-bottom span { font-family: ui-monospace, monospace; font-size: 10px; letter-spacing: 1.3px; }
.content-layout { display: grid; grid-template-columns: minmax(0, 1fr) 260px; gap: 48px; padding-block: 43px 70px; }
.section-heading { display: flex; align-items: center; justify-content: space-between; margin-bottom: 22px; gap: 15px; }
.section-heading h2 { margin: 0; font-size: 20px; font-weight: 650; letter-spacing: -.5px; }
.section-heading h2 span { display: inline-block; margin-left: 10px; color: var(--muted); font: 10px/1.5 monospace; letter-spacing: 1px; vertical-align: middle; }
.section-heading > span { color: var(--muted); font: 11px monospace; }
.featured { display: grid; grid-template-columns: .85fr 1.15fr; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; transition: border-color .2s, transform .2s; }
.featured:hover { border-color: var(--accent); transform: translateY(-3px); }
.feature-art { position: relative; min-height: 255px; background: #e1eafa; overflow: hidden; display: grid; place-items: center; color: #345a8e; }
.feature-art::before { content: ""; position: absolute; width: 210px; height: 210px; border: 1px solid #bdcfe9; border-radius: 50%; }
.feature-art::after { content: ""; position: absolute; width: 155px; height: 155px; border: 1px solid #bdcfe9; border-radius: 50%; }
.feature-art > svg { width: 160px; height: 160px; stroke-width: 1; z-index: 1; }
.art-label { position: absolute; bottom: 15px; left: 17px; font: 8px monospace; letter-spacing: 2px; color: #586f94; }
.art-number { position: absolute; top: 13px; right: 16px; font: 10px monospace; color: #586f94; }
.feature-copy { padding: 27px 27px 24px; display: flex; flex-direction: column; align-items: start; }
.pill { padding: 3px 9px; border-radius: 5px; font-size: 10px; color: var(--accent); background: var(--soft); display: inline-flex; align-items: center; gap: 4px; }
.pill svg { width: 12px; height: 12px; }
.feature-copy h3 { font-size: 21px; line-height: 1.6; margin: 13px 0 8px; letter-spacing: -.5px; }
.feature-copy p { margin: 0 0 19px; font-size: 12px; color: var(--muted); line-height: 1.9; }
.feature-footer { display: flex; align-items: center; justify-content: space-between; gap: 15px; width: 100%; margin-top: auto; font-size: 11px; color: var(--muted); }
.feature-footer svg { color: var(--accent); }
.posts-section { margin-top: 37px; }
.filters { display: flex; gap: 7px; flex-wrap: wrap; padding-bottom: 18px; border-bottom: 1px solid var(--line); }
.filter { background: transparent; color: var(--muted); padding: 6px 13px; font-size: 12px; border-radius: 6px; transition: color .15s, background .15s; }
.filter:hover { color: var(--accent); background: var(--soft); }
.filter[aria-pressed="true"] { background: var(--accent); color: var(--bg); }
.filter span { font: 10px monospace; margin-left: 4px; opacity: .7; }
.search-field { display: flex; align-items: center; gap: 10px; border: 1px solid var(--line); background: var(--surface); padding: 9px 12px; border-radius: 8px; margin: 15px 0 0; }
.search-field > svg { width: 17px; color: var(--muted); }
.search-field input { min-width: 0; width: 100%; background: transparent; border: none; outline: none; font-size: 13px; }
.search-field:focus-within { border-color: var(--accent); outline: 2px solid var(--accent); outline-offset: 2px; }
.post { border-bottom: 1px solid var(--line); }
.post-link { display: grid; grid-template-columns: minmax(0, 1fr) 112px; align-items: center; gap: 25px; padding: 24px 0; }
.post-tag { color: var(--accent); font-size: 10px; }
.post h3 { margin: 5px 0 7px; font-size: 17px; font-weight: 650; line-height: 1.6; transition: color .15s; }
.post-link:hover h3 { color: var(--accent); }
.post p { margin: 0 0 10px; color: var(--muted); font-size: 12px; }
.post-meta { display: flex; align-items: center; gap: 8px; font: 10px/1.7 ui-monospace, monospace; color: var(--muted); }
.post-meta span + span::before { content: "·"; margin-right: 8px; }
.post-art { height: 94px; border-radius: 9px; display: grid; place-items: center; overflow: hidden; background: var(--soft); color: var(--accent); transition: transform .2s; }
.post-art > svg { width: 39px; height: 39px; stroke-width: 1.25; }
.post-art img { width: 100%; height: 100%; object-fit: cover; }
.post-art.math { background: #eee9dc; color: #7f6b46; font: italic 33px Georgia, serif; }
.post-art.blue { background: #e4ebef; color: #59738a; }
.post-art.rose { background: #f0e7e2; color: #97765e; }
.post-link:hover .post-art { transform: rotate(-3deg); }
.empty-state { color: var(--muted); text-align: center; padding: 40px 15px; }
.list-end { display: flex; justify-content: center; gap: 10px; align-items: center; margin: 27px 0 0; color: var(--muted); font-size: 10px; }
.list-end::before, .list-end::after { content: ""; width: 27px; height: 1px; background: var(--line); }
.sidebar { padding-top: 4px; }
.about-card { background: var(--soft); border: 1px solid var(--line); border-radius: var(--radius); padding: 24px; }
.avatar { display: grid; place-items: center; width: 49px; height: 49px; background: var(--accent); color: var(--bg); border-radius: 15px; font: 700 21px monospace; letter-spacing: -3px; }
.about-card h2 { margin: 16px 0 0; font-size: 18px; letter-spacing: -.5px; }
.about-caption { color: var(--accent); font: 9px monospace; letter-spacing: 1px; margin-top: 3px; }
.about-card > p { font-size: 12px; color: var(--muted); line-height: 1.9; margin: 16px 0; }
.about-tags { display: flex; gap: 6px; flex-wrap: wrap; }
.about-tags span { padding: 2px 7px; border: 1px solid var(--line); border-radius: 4px; font-size: 9px; color: var(--muted); background: var(--bg); }
.about-stats { display: grid; grid-template-columns: 1fr 1fr; margin-top: 23px; padding-top: 18px; border-top: 1px solid var(--line); }
.about-stats div + div { padding-left: 25px; border-left: 1px solid var(--line); }
.about-stats strong { display: block; font: 23px/1.3 ui-monospace, monospace; }
.about-stats span { color: var(--muted); font-size: 10px; }
.sidebar-section { margin-top: 30px; }
.sidebar-section h2 { display: flex; gap: 9px; align-items: center; font-size: 13px; margin: 0 0 14px; font-weight: 600; }
.sidebar-section h2 svg { width: 15px; height: 15px; color: var(--accent); }
.topic-link { display: flex; align-items: center; justify-content: space-between; padding: 10px 0; border-bottom: 1px solid var(--line); width: 100%; color: var(--muted); background: transparent; font-size: 12px; }
.topic-link:hover { color: var(--accent); }
.topic-link > span:last-child { font: 10px monospace; padding: 1px 6px; border-radius: 4px; background: var(--soft); }
.quick-link { display: flex; justify-content: space-between; align-items: center; font-size: 12px; color: var(--muted); padding: 9px 0; }
.quick-link:hover { color: var(--accent); }
.quick-link svg { width: 14px; height: 14px; }
.note-card { margin-top: 29px; padding: 22px; border: 1px dashed #bacbe3; border-radius: 12px; }
.note-card > span { color: var(--accent); font: 23px Georgia, serif; }
.note-card blockquote { margin: 3px 0 12px; color: var(--muted); font-size: 12px; line-height: 2; }
.note-card p { color: var(--muted); font: 9px monospace; letter-spacing: 1px; margin: 0; }
.site-footer { border-top: 1px solid var(--line); }
.footer-inner { display: flex; align-items: center; justify-content: space-between; gap: 20px; padding-block: 27px; color: var(--muted); font-size: 10px; }
.footer-inner p { margin: 0; }
.footer-inner a { display: flex; align-items: center; gap: 8px; }
.footer-inner svg { width: 14px; height: 14px; }
.sun-icon { display: none; }
[data-theme="dark"] .sun-icon { display: block; }
[data-theme="dark"] .moon-icon { display: none; }
@media (min-width: 1500px) { .hero { padding-block: 86px 80px; } .hero-visual { height: 330px; } }
@media (max-width: 1000px) {
  .container { width: calc(100% - 48px); }
  .hero { gap: 35px; }
  .content-layout { grid-template-columns: minmax(0, 1fr) 230px; gap: 28px; }
  .feature-copy { padding: 22px; }
  .feature-copy h3 { font-size: 18px; }
  .main-nav { gap: 20px; }
  .header-inner { gap: 20px; }
  .brand small { display: none; }
}
@media (max-width: 760px) {
  .header-inner { height: 68px; }
  .header-tools { margin-left: auto; padding-left: 0; border: 0; gap: 2px; }
  .main-nav { gap: 20px; margin-left: auto; }
  .hero { grid-template-columns: 1fr 1fr; gap: 22px; padding-block: 44px; }
  h1 { font-size: 34px; letter-spacing: -1.5px; }
  .hero-visual { height: 290px; border-top-left-radius: 60px; }
  .hero-copy > p { font-size: 12px; }
  .hero-actions { gap: 17px; font-size: 11px; }
  .primary-link { padding: 10px 14px; gap: 12px; }
  .content-layout { grid-template-columns: minmax(0, 1fr); padding-top: 30px; }
  .sidebar { display: grid; grid-template-columns: 1fr 1fr; align-items: start; gap: 25px; border-top: 1px solid var(--line); padding-top: 30px; }
  .about-card { grid-row: span 2; }
  .sidebar-section, .note-card { margin-top: 0; }
}
@media (max-width: 540px) {
  .container { width: calc(100% - 36px); }
  .brand { font-size: 16px; gap: 8px; }
  .brand-mark { width: 30px; height: 30px; font-size: 16px; border-radius: 8px; }
  .menu-toggle { display: grid; }
  .main-nav { display: none; position: absolute; top: 68px; left: 0; right: 0; height: auto; padding: 16px 24px; border-bottom: 1px solid var(--line); background: var(--bg); justify-content: space-around; }
  .main-nav.is-open { display: flex; }
  .main-nav a { height: auto; }
  .main-nav a.active::after { bottom: -7px; }
  .hero { grid-template-columns: 1fr; padding: 37px 0 30px; gap: 31px; }
  .eyebrow { font-size: 9px; }
  h1 { font-size: 39px; margin: 19px 0 14px; line-height: 1.4; }
  .hero-copy > p { font-size: 13px; max-width: 320px; }
  .hero-actions { font-size: 12px; margin-top: 23px; gap: 24px; }
  .primary-link { padding: 11px 18px; gap: 22px; }
  .hero-visual { height: 205px; border-top-left-radius: 60px; }
  .visual-note { inset: auto 20px 19px; }
  .hero-bottom { font-size: 10px; }
  .hero-bottom > span { display: none; }
  .section-heading h2 { font-size: 18px; }
  .section-heading h2 span { font-size: 9px; }
  .featured { grid-template-columns: 1fr; }
  .feature-art { min-height: 180px; }
  .feature-art > svg { width: 135px; height: 135px; }
  .feature-art::before { width: 160px; height: 160px; }
  .feature-art::after { width: 115px; height: 115px; }
  .feature-copy { padding: 22px; }
  .feature-copy h3 { font-size: 20px; margin-top: 10px; }
  .filter { font-size: 11px; padding: 6px 10px; }
  .filters { gap: 4px; }
  .post-link { grid-template-columns: minmax(0, 1fr) 80px; gap: 16px; padding: 21px 0; }
  .post-art { height: 80px; }
  .post h3 { font-size: 15px; }
  .post p { font-size: 11px; }
  .post-meta { font-size: 9px; }
  .sidebar { grid-template-columns: 1fr; }
  .about-card { grid-row: auto; }
  .about-stats { max-width: 230px; }
  .footer-inner { flex-wrap: wrap; justify-content: center; gap: 8px 20px; text-align: center; }
  .footer-inner p:first-child { width: 100%; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; animation: none !important; }
}