:root {
  color-scheme: light;
  --paper: #fbfaf7;
  --paper-deep: #f3f0e8;
  --ink: #171717;
  --ink-soft: #4d4d4d;
  --muted: #77736b;
  --line: #e5dfd3;
  --line-strong: #cfc6b6;
  --accent: #173b7a;
  --accent-soft: #e8eef9;
  --accent-warm: #8a3d52;
  --card: rgba(255, 255, 255, 0.66);
  --code: rgba(255, 253, 247, 0.82);
  --shadow: 0 24px 80px rgba(40, 34, 24, 0.08);
  --radius-xl: 30px;
  --radius-lg: 22px;
  font-family: ui-serif, Georgia, "Times New Roman", "Noto Serif SC", "Songti SC", serif;
  font-size: 16px;
}

* {
  box-sizing: border-box;
}

html {
  background: var(--paper);
  scroll-behavior: smooth;
  scroll-padding-top: 32px;
}

body {
  min-height: 100vh;
  display: block;
  max-width: none;
  margin: 0;
  padding: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 8% 8%, rgba(23, 59, 122, 0.08), transparent 28%),
    radial-gradient(circle at 94% 16%, rgba(138, 61, 82, 0.08), transparent 26%),
    linear-gradient(135deg, var(--paper), #fff 42%, var(--paper-deep));
  font-variant-numeric: oldstyle-nums;
}

body::before {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  content: "";
  background-image:
    linear-gradient(rgba(23, 23, 23, 0.026) 1px, transparent 1px),
    linear-gradient(90deg, rgba(23, 23, 23, 0.022) 1px, transparent 1px);
  background-size: 44px 44px;
  mask-image: linear-gradient(to bottom, black, transparent 88%);
}

a {
  color: var(--accent);
  text-decoration: none;
  text-underline-offset: 0.18em;
  transition: color 160ms ease, border-color 160ms ease, transform 160ms ease, background 160ms ease;
}

a:hover,
a:focus-visible {
  color: var(--accent-warm);
  text-decoration: underline;
}

img {
  max-width: 100%;
}

.article-bg {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  overflow: hidden;
}

.article-bg::before,
.article-bg::after {
  position: absolute;
  border-radius: 50%;
  content: "";
  filter: blur(2px);
}

.article-bg::before {
  top: -150px;
  right: -90px;
  width: 420px;
  height: 420px;
  background: radial-gradient(circle, rgba(23, 59, 122, 0.12), transparent 68%);
}

.article-bg::after {
  left: -120px;
  bottom: -170px;
  width: 460px;
  height: 460px;
  background: radial-gradient(circle, rgba(138, 61, 82, 0.12), transparent 70%);
}

.article-shell,
.container {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 230px;
  gap: clamp(28px, 4vw, 54px);
  width: min(1120px, calc(100% - 40px));
  margin: 0 auto;
  padding: clamp(28px, 5vw, 70px) 0;
}

.article-main,
.container main {
  min-width: 0;
}

.article-card,
.container main,
.article-toc,
.toc,
.article-nav,
.nav-back a,
.article-footer {
  border: 1px solid rgba(207, 198, 182, 0.72);
  background: var(--card);
  box-shadow: var(--shadow);
  backdrop-filter: blur(16px) saturate(1.08);
  -webkit-backdrop-filter: blur(16px) saturate(1.08);
}

.article-nav,
.nav-back a {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-height: 40px;
  margin-bottom: 16px;
  padding: 0 14px;
  border-radius: 999px;
  color: var(--ink-soft);
  font: 800 0.78rem/1 ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.article-nav:hover,
.article-nav:focus-visible,
.nav-back a:hover,
.nav-back a:focus-visible {
  text-decoration: none;
  transform: translateY(-1px);
}

.article-card,
.container main {
  position: relative;
  padding: clamp(28px, 5vw, 58px);
  border-radius: var(--radius-xl);
  overflow: hidden;
}

.article-card::before,
.container main::before {
  position: absolute;
  top: 22px;
  right: 26px;
  color: rgba(23, 59, 122, 0.13);
  content: "notes / article";
  font: 900 0.68rem/1 ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.article-header,
.container main > header {
  position: relative;
  max-width: 820px;
  margin-bottom: clamp(32px, 5vw, 56px);
}

.article-tag {
  display: inline-flex;
  margin-bottom: 16px;
  color: var(--accent);
  font: 800 0.74rem/1 ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.article-title,
.article-card h1,
.container main > header h1 {
  margin: 0;
  color: var(--ink);
  font-size: clamp(2.6rem, 7vw, 5.6rem);
  font-weight: 500;
  line-height: 0.94;
  letter-spacing: -0.075em;
}

.article-meta,
.meta {
  margin-top: 22px;
  color: var(--muted);
  font: italic 0.98rem/1.6 ui-serif, Georgia, "Times New Roman", "Noto Serif SC", serif;
}

.content,
.article-content {
  max-width: 760px;
  color: var(--ink-soft);
  font-size: clamp(1.03rem, 1.35vw, 1.12rem);
  line-height: 1.86;
}

.content > *:first-child,
.article-content > *:first-child {
  margin-top: 0;
}

.content p,
.article-content p {
  margin: 0 0 1.45rem;
}

.content h2,
.article-content h2 {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin: clamp(42px, 6vw, 58px) 0 18px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
  color: var(--ink);
  font-size: clamp(1.42rem, 3vw, 2rem);
  font-weight: 500;
  line-height: 1.1;
  letter-spacing: -0.035em;
}

.content h3,
.article-content h3 {
  margin: 34px 0 14px;
  color: var(--ink);
  font-size: 1.24rem;
  line-height: 1.25;
}

.content ul,
.content ol,
.article-content ul,
.article-content ol {
  margin: 0 0 1.5rem;
  padding-left: 1.25rem;
}

.content li,
.article-content li {
  margin-bottom: 0.65rem;
  padding-left: 0.18rem;
}

code {
  border: 1px solid rgba(207, 198, 182, 0.6);
  border-radius: 7px;
  padding: 0.13em 0.38em;
  color: var(--accent-warm);
  background: rgba(255, 253, 247, 0.82);
  font: 0.9em/1.5 ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
}

pre {
  margin: 28px 0;
  padding: 20px;
  border: 1px solid rgba(207, 198, 182, 0.76);
  border-radius: var(--radius-lg);
  background: var(--code);
  box-shadow: 0 14px 40px rgba(40, 34, 24, 0.07);
  overflow-x: auto;
}

pre code {
  display: block;
  border: 0;
  padding: 0;
  color: var(--ink-soft);
  background: transparent;
  font-size: 0.9rem;
  line-height: 1.65;
}

blockquote {
  position: relative;
  margin: 30px 0;
  padding: 22px 24px;
  border: 1px solid rgba(207, 198, 182, 0.72);
  border-left: 4px solid var(--accent-warm);
  border-radius: var(--radius-lg);
  color: var(--ink-soft);
  background: rgba(255, 253, 247, 0.64);
  font-style: italic;
}

figure {
  margin: 34px 0;
}

figure img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid rgba(207, 198, 182, 0.72);
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.62);
  box-shadow: 0 18px 52px rgba(40, 34, 24, 0.1);
}

figcaption {
  margin-top: 12px;
  color: var(--muted);
  font: 0.86rem/1.5 ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  text-align: center;
}

.article-toc,
.toc {
  position: sticky;
  top: 28px;
  align-self: start;
  padding: 20px;
  border-radius: var(--radius-lg);
}

.article-toc h4,
.toc h4 {
  margin: 0 0 14px;
  color: var(--muted);
  font: 900 0.7rem/1 ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.article-toc ul,
.toc ul {
  display: grid;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.article-toc a,
.toc a {
  display: block;
  padding: 8px 10px;
  border-radius: 12px;
  color: var(--ink-soft);
  font: 700 0.84rem/1.35 ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

.article-toc a:hover,
.article-toc a:focus-visible,
.toc a:hover,
.toc a:focus-visible {
  color: var(--accent);
  background: rgba(23, 59, 122, 0.055);
  text-decoration: none;
}

.article-footer {
  margin-top: 18px;
  padding: 18px 20px;
  border-radius: var(--radius-lg);
  color: var(--muted);
  font: 0.86rem/1.6 ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  text-align: center;
}

@media (max-width: 950px) {
  .article-shell {
    grid-template-columns: 1fr;
  }

  .container {
    grid-template-columns: 1fr;
  }

  .article-toc,
  .toc {
    display: none;
  }
}

@media (max-width: 620px) {
  .article-shell {
    width: min(100% - 24px, 1120px);
    padding: 18px 0 34px;
  }

  .container {
    width: min(100% - 24px, 1120px);
    padding: 18px 0 34px;
  }

  .article-card,
  .container main {
    padding: 24px 22px;
  }

  .article-card::before,
  .container main::before {
    display: none;
  }

  .article-title,
  .article-card h1,
  .container main > header h1 {
    font-size: clamp(2.25rem, 14vw, 3.2rem);
  }
}