:root {
  color-scheme: light dark;
  --paper: #f6f5f1;
  --surface: #fffefa;
  --ink: #202c32;
  --muted: #65747a;
  --line: #dce3df;
  --accent: #087f72;
  --accent-strong: #06665d;
  --soft-accent: #e5f2ed;
  --code-bg: #17232a;
  --code-ink: #e7eef0;
  --shadow: 0 18px 55px rgb(29 50 48 / 7%);
  font-synthesis: none;
  text-rendering: optimizeLegibility;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.72;
}
a { color: var(--accent-strong); text-decoration-thickness: .08em; text-underline-offset: .18em; }
a:hover { color: var(--accent); }
:focus-visible { outline: 3px solid #df9d43; outline-offset: 3px; }
.site-shell { width: min(1120px, calc(100% - 40px)); margin-inline: auto; }
.skip-link { position: absolute; left: -9999px; top: 8px; z-index: 10; padding: 8px 12px; background: var(--surface); }
.skip-link:focus { left: 8px; }

.site-header { border-bottom: 1px solid var(--line); background: var(--surface); }
.header-inner { min-height: 72px; display: flex; align-items: center; justify-content: space-between; gap: 28px; }
.site-brand { color: var(--ink); font-size: 1.02rem; font-weight: 760; letter-spacing: -.035em; text-decoration: none; }
.brand-mark { color: var(--accent); font-size: 1.5em; }
.site-nav { display: flex; flex-wrap: wrap; gap: 24px; font-size: .88rem; }
.site-nav a { color: var(--muted); text-decoration: none; }
.site-nav a:hover { color: var(--accent-strong); }
.site-main { min-height: calc(100vh - 150px); padding-block: 38px 88px; }

.hero {
  position: relative;
  overflow: hidden;
  padding: clamp(36px, 7vw, 78px);
  border: 1px solid #cfdfd8;
  border-radius: 18px;
  background: radial-gradient(ellipse at 92% 18%, rgb(8 127 114 / 13%), transparent 34%), linear-gradient(135deg, #edf5f0, #fffefa 68%);
  box-shadow: var(--shadow);
}
.eyebrow { margin: 0 0 12px; color: var(--accent-strong); font-size: .72rem; font-weight: 780; letter-spacing: .16em; }
.hero h1 { max-width: 720px; margin: 0; font-size: clamp(2.45rem, 6.5vw, 5.15rem); line-height: 1.08; letter-spacing: -.065em; }
.hero-copy { max-width: 620px; margin: 24px 0 0; color: var(--muted); font-size: clamp(1rem, 2vw, 1.18rem); }
.hero-link { display: inline-flex; align-items: center; gap: 12px; margin-top: 32px; padding: 11px 17px; border-radius: 7px; background: var(--accent-strong); color: white; font-size: .92rem; font-weight: 680; text-decoration: none; }
.hero-link:hover { background: var(--ink); color: white; }
.hero-index { position: absolute; right: 5%; bottom: 4%; color: rgb(8 127 114 / 9%); font-size: clamp(2.8rem, 8vw, 6.5rem); font-weight: 850; line-height: .9; letter-spacing: -.08em; text-align: right; pointer-events: none; }

.post-section { margin-top: 76px; }
.section-heading { display: flex; justify-content: space-between; align-items: end; gap: 20px; margin-bottom: 22px; }
.section-heading .eyebrow { margin-bottom: 4px; }
.section-heading h2, .principles h2 { margin: 0; font-size: clamp(1.5rem, 3vw, 2rem); letter-spacing: -.045em; line-height: 1.25; }
.post-count { color: var(--muted); font-size: .9rem; }
.post-list { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
.post-card { min-width: 0; padding: 24px; border: 1px solid var(--line); border-radius: 12px; background: var(--surface); transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease; }
.post-card:hover { transform: translateY(-2px); border-color: #9cc8b9; box-shadow: var(--shadow); }
.post-card-meta, .article-meta { display: flex; flex-wrap: wrap; gap: 12px; color: var(--muted); font-size: .82rem; }
.post-card h3, .post-card h2 { margin: 13px 0 8px; font-size: 1.22rem; line-height: 1.4; letter-spacing: -.025em; }
.post-card h3 a, .post-card h2 a { color: var(--ink); text-decoration: none; }
.post-card h3 a:hover, .post-card h2 a:hover { color: var(--accent-strong); }
.post-card p { margin: 0; color: var(--muted); font-size: .94rem; }
.tag-list { display: flex; flex-wrap: wrap; gap: 7px; margin: 16px 0 0; padding: 0; list-style: none; }
.tag-list li { padding: 3px 9px; border-radius: 999px; background: var(--soft-accent); color: var(--accent-strong); font-size: .74rem; }
.empty-state { grid-column: 1 / -1; padding: 24px; border: 1px dashed var(--line); border-radius: 10px; color: var(--muted); }
.principles { margin-top: 58px; padding: 28px 32px; border-left: 3px solid var(--accent); background: color-mix(in srgb, var(--soft-accent) 55%, transparent); }
.principles h2 { max-width: 660px; }
.principles > p:last-child { max-width: 700px; margin: 12px 0 0; color: var(--muted); }

.article { width: min(780px, 100%); margin-inline: auto; }
.article-header { padding: 8px 0 34px; border-bottom: 1px solid var(--line); }
.back-link { display: inline-block; margin-bottom: 26px; color: var(--muted); font-size: .86rem; text-decoration: none; }
.back-link:hover { color: var(--accent-strong); }
.article-header .eyebrow { margin-bottom: 10px; }
.article-header h1, .listing-page > h1 { margin: 0; font-size: clamp(2rem, 5vw, 3.3rem); line-height: 1.2; letter-spacing: -.055em; }
.article-meta { margin-top: 17px; }
.article-lead { max-width: 700px; margin: 21px 0 0; color: var(--muted); font-size: 1.12rem; }
.article-toc { margin: 26px 0 34px; padding: 17px 22px; border: 1px solid var(--line); border-radius: 10px; background: var(--surface); }
.article-toc summary { color: var(--ink); font-weight: 700; cursor: pointer; }
.article-toc nav { margin-top: 10px; }
.article-toc ul { margin-block: 6px; padding-left: 22px; }
.article-body { font-size: 1.02rem; line-height: 1.85; overflow-wrap: anywhere; }
.article-body > :first-child { margin-top: 0; }
.article-body h2 { margin: 2.25em 0 .75em; padding-bottom: .35em; border-bottom: 1px solid var(--line); font-size: 1.65rem; line-height: 1.35; letter-spacing: -.04em; scroll-margin-top: 24px; }
.article-body h3 { margin: 1.8em 0 .6em; font-size: 1.25rem; line-height: 1.4; scroll-margin-top: 24px; }
.article-body p, .article-body ul, .article-body ol { margin-block: 1em; }
.article-body li + li { margin-top: .35em; }
.article-body blockquote { margin: 1.5em 0; padding: 12px 18px; border-left: 3px solid var(--accent); background: var(--soft-accent); color: var(--muted); }
.article-body blockquote > :first-child { margin-top: 0; }
.article-body blockquote > :last-child { margin-bottom: 0; }
.article-body code:not(pre code) { padding: .13em .34em; border: 1px solid var(--line); border-radius: 4px; background: color-mix(in srgb, var(--paper) 75%, var(--surface)); font-size: .88em; }
.article-body .highlight, .article-body pre { max-width: 100%; overflow: auto; border-radius: 8px; }
.article-body pre { margin: 1.35em 0; padding: 18px 20px; background: var(--code-bg) !important; color: var(--code-ink); font-size: .87rem; line-height: 1.65; tab-size: 4; }
.article-body pre code { padding: 0; background: transparent; color: inherit; font-size: inherit; }
.article-body table { display: block; width: 100%; overflow-x: auto; border-collapse: collapse; font-size: .9rem; }
.article-body th, .article-body td { padding: 9px 12px; border: 1px solid var(--line); text-align: left; vertical-align: top; }
.article-body th { background: var(--soft-accent); }
.article-body img { max-width: 100%; height: auto; }
.article-body hr { margin-block: 2em; border: 0; border-top: 1px solid var(--line); }
.article-end { margin-top: 48px; padding: 24px; border: 1px solid var(--line); border-radius: 10px; background: var(--surface); }
.article-end p { margin: 0 0 12px; color: var(--muted); }
.listing-page { max-width: 800px; margin-inline: auto; }
.listing-page .post-list { margin-top: 24px; }
.not-found { max-width: 680px; margin: 10vh auto; padding: clamp(28px, 6vw, 58px); border: 1px solid var(--line); border-radius: 14px; background: var(--surface); box-shadow: var(--shadow); }
.not-found h1 { margin: 0; font-size: clamp(2rem, 5vw, 3.2rem); line-height: 1.15; letter-spacing: -.055em; }
.not-found > p:not(.eyebrow) { color: var(--muted); }
.site-footer { border-top: 1px solid var(--line); background: var(--surface); color: var(--muted); font-size: .82rem; }
.footer-inner { display: flex; justify-content: space-between; gap: 12px; padding-block: 18px; }

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #11191d;
    --surface: #172227;
    --ink: #e7eeeb;
    --muted: #a4b2b3;
    --line: #304044;
    --accent: #62cbb4;
    --accent-strong: #83dbc6;
    --soft-accent: #1d3533;
    --code-bg: #0b1114;
    --code-ink: #e7eef0;
    --shadow: 0 18px 55px rgb(0 0 0 / 18%);
  }
  .hero { border-color: #2c4c47; background: radial-gradient(ellipse at 92% 18%, rgb(98 203 180 / 12%), transparent 34%), linear-gradient(135deg, #182d2b, #172227 72%); }
  .hero-index { color: rgb(98 203 180 / 7%); }
  .hero-link { color: #10211e; }
  .hero-link:hover { color: #fff; }
  .article-body code:not(pre code) { background: #202d31; }
}

@media (max-width: 680px) {
  .site-shell { width: min(100% - 28px, 1120px); }
  .header-inner { min-height: 64px; align-items: flex-start; flex-direction: column; justify-content: center; gap: 2px; padding-block: 12px; }
  .site-nav { gap: 15px; font-size: .82rem; }
  .site-main { padding-block: 22px 58px; }
  .hero { padding: 32px 24px; border-radius: 13px; }
  .hero-index { right: 15px; bottom: 12px; font-size: 2.4rem; }
  .hero-copy { max-width: 90%; }
  .post-section { margin-top: 48px; }
  .post-list { grid-template-columns: 1fr; }
  .post-card { padding: 20px; }
  .principles { margin-top: 40px; padding: 22px; }
  .article-body { font-size: 1rem; }
  .article-body h2 { font-size: 1.42rem; }
  .footer-inner { flex-direction: column; gap: 3px; }
}

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