:root {
  --bg: #ffffff;
  --ink: #0a0a0a;
  --ink-soft: #1a1f25;
  --muted: #666a70;
  --line: #e8eaed;
  --accent: #0b66c3;
  --surface-code: #f3f0ea;
  --fs-body: 1.02rem;
  --fs-meta: 0.9rem;
  --fs-title: clamp(1.5rem, 3.2vw, 2rem);
  --fs-display: clamp(1.8rem, 4vw, 2.6rem);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  min-height: 100vh;
  font-family: "IBM Plex Sans", sans-serif;
  font-size: var(--fs-body);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.6;
}

.site-shell {
  width: min(860px, 92vw);
  margin: 0 auto;
}

.site-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.25rem 0;
  border-bottom: 1px solid var(--line);
}

.brand {
  text-decoration: none;
  color: var(--ink);
  font-weight: 600;
  letter-spacing: 0.02em;
}

.top-nav {
  display: flex;
  gap: 0.9rem;
}

.top-nav a {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.96rem;
}

.top-nav a:hover {
  color: var(--ink);
}

.theme-toggle {
  border: 1px solid var(--line);
  background: transparent;
  color: var(--muted);
  font: inherit;
  font-size: 0.86rem;
  padding: 0.22rem 0.6rem;
  border-radius: 999px;
  cursor: pointer;
}

.theme-toggle:hover {
  color: var(--ink);
  border-color: var(--muted);
}

.hero {
  padding: 3rem 0 2rem;
  border-bottom: 1px solid var(--line);
}

.hero-title {
  margin: 0;
  font-family: "Newsreader", serif;
  font-size: var(--fs-display);
  line-height: 1.02;
  letter-spacing: -0.02em;
}

.hero-subtitle {
  margin: 1rem 0 0;
  max-width: 65ch;
  color: var(--muted);
  font-size: 1.05rem;
}

.hero-links {
  margin: 1rem 0 0;
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.hero-links a {
  color: var(--muted);
  text-decoration: none;
}

.hero-links a:hover {
  color: var(--ink);
  text-decoration: underline;
}

.post-stream {
  padding: 1.4rem 0 3.5rem;
}

.post-card {
  padding: 1.05rem 0;
  margin: 0;
  border-bottom: 1px solid var(--line);
}

.post-card h2,
.post-header h1,
.page-header h1 {
  margin: 0;
  font-family: "Newsreader", serif;
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: -0.01em;
}

.post-card h2 {
  font-size: var(--fs-title);
}

.post-card h2 a {
  color: var(--ink);
  text-decoration: none;
}

.post-card h2 a:hover {
  text-decoration: underline;
  text-underline-offset: 3px;
}

.meta {
  margin: 0.2rem 0 0.55rem;
  color: var(--muted);
  font-size: var(--fs-meta);
}

.post-body,
.page-body {
  padding: 2rem 0 4rem;
}

.post-header,
.page-header {
  margin-bottom: 1rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--line);
}

.post-header h1,
.page-header h1 {
  font-size: clamp(2rem, 5.2vw, 3.2rem);
}

.prose {
  max-width: 72ch;
}

.prose p,
.prose li,
.post-card p {
  color: var(--ink-soft);
}

.prose a {
  color: var(--accent);
}

.prose h2,
.prose h3 {
  font-family: "Newsreader", serif;
  margin-top: 2rem;
  margin-bottom: 0.5rem;
}

.prose pre {
  overflow-x: auto;
  padding: 1rem;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: var(--surface-code);
  font-size: 0.9rem;
}

.site-footer {
  border-top: 1px solid var(--line);
  padding: 1rem 0 2rem;
  color: var(--muted);
  font-size: 0.9rem;
}

.site-footer a {
  color: var(--muted);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b0d10;
    --ink: #f4f6f8;
    --ink-soft: #d9dfe6;
    --muted: #a7b0ba;
    --line: #262b31;
    --accent: #7fb5ff;
    --surface-code: #14181d;
  }

  .post-card h2 a:hover,
  .hero-links a:hover,
  .top-nav a:hover {
    color: var(--ink);
  }

  .prose a {
    color: var(--accent);
  }
}

:root[data-theme="light"] {
  --bg: #ffffff;
  --ink: #0a0a0a;
  --ink-soft: #1a1f25;
  --muted: #666a70;
  --line: #e8eaed;
  --accent: #0b66c3;
  --surface-code: #f3f0ea;
}

:root[data-theme="dark"] {
  --bg: #0b0d10;
  --ink: #f4f6f8;
  --ink-soft: #d9dfe6;
  --muted: #a7b0ba;
  --line: #262b31;
  --accent: #7fb5ff;
  --surface-code: #14181d;
}

@media (max-width: 760px) {
  .site-header {
    align-items: flex-start;
    flex-direction: column;
    gap: 0.7rem;
  }

  .top-nav {
    flex-wrap: wrap;
  }

  .post-card {
    padding: 1.1rem 0;
  }
}