/* ---------- Reset & tokens ---------- */

*, *::before, *::after {
  box-sizing: border-box;
}

:root {
  --bg: #fbfaf7;
  --bg-subtle: #f3f1ec;
  --text: #1c1b18;
  --text-muted: #6b6760;
  --border: #e2ded6;
  --accent: #8a5a2b;
  --code-bg: #f0ede6;

  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-serif: "Newsreader", Georgia, "Times New Roman", serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, monospace;

  --measure: 42rem;
  --wrap: 46rem;
}

[data-theme="dark"] {
  --bg: #14130f;
  --bg-subtle: #1c1a16;
  --text: #e8e5de;
  --text-muted: #9a958b;
  --border: #2c2924;
  --accent: #d9a86c;
  --code-bg: #201e19;
}

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.65;
  font-feature-settings: "kern" 1, "liga" 1;
  -webkit-font-smoothing: antialiased;
  transition: background-color 0.25s ease, color 0.25s ease;
}

.wrap {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 1.5rem;
}

a {
  color: var(--text);
  text-decoration: none;
  border-bottom: 1px solid var(--border);
  transition: border-color 0.15s ease, color 0.15s ease;
}

a:hover {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

/* ---------- Header ---------- */

.site-header {
  border-bottom: 1px solid var(--border);
  margin-bottom: 3.5rem;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 1.1rem;
  padding-bottom: 1.1rem;
  gap: 1rem;
}

.brand {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  font-weight: 500;
  border-bottom: none;
  letter-spacing: -0.01em;
}

.brand:hover {
  color: var(--accent);
}

.nav {
  display: flex;
  align-items: center;
  gap: 1.4rem;
  font-size: 0.92rem;
}

.nav a {
  border-bottom: none;
  color: var(--text-muted);
}

.nav a:hover,
.nav a[aria-current="page"] {
  color: var(--text);
}

.theme-toggle {
  background: none;
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--text-muted);
  cursor: pointer;
  width: 2rem;
  height: 2rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  transition: color 0.15s ease, border-color 0.15s ease;
}

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

.theme-toggle .icon-sun { display: none; }
[data-theme="dark"] .theme-toggle .icon-moon { display: none; }
[data-theme="dark"] .theme-toggle .icon-sun { display: block; }

/* ---------- Intro ---------- */

.intro {
  margin-bottom: 4rem;
}

.intro h1 {
  font-family: var(--font-serif);
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  line-height: 1.2;
  font-weight: 400;
  letter-spacing: -0.02em;
  margin: 0 0 1.2rem;
}

.intro p {
  max-width: var(--measure);
  color: var(--text-muted);
  font-size: 1.05rem;
  margin: 0;
}

/* ---------- Post list ---------- */

.post-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.post-item {
  border-top: 1px solid var(--border);
  padding: 2rem 0;
}

.post-item:last-child {
  border-bottom: 1px solid var(--border);
}

.post-item a {
  border-bottom: none;
  display: block;
}

.post-item a:hover .post-title {
  color: var(--accent);
}

.post-meta {
  font-size: 0.8rem;
  color: var(--text-muted);
  letter-spacing: 0.02em;
  text-transform: uppercase;
  margin: 0 0 0.6rem;
}

.post-title {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 500;
  line-height: 1.25;
  letter-spacing: -0.015em;
  margin: 0 0 0.6rem;
  transition: color 0.15s ease;
}

.post-excerpt {
  color: var(--text-muted);
  max-width: var(--measure);
  margin: 0;
  font-size: 1rem;
}

/* ---------- Article / page ---------- */

.page,
.post {
  max-width: var(--measure);
  margin: 0 auto;
}

.post-header {
  margin-bottom: 2.5rem;
}

.page h1,
.post-header h1 {
  font-family: var(--font-serif);
  font-size: clamp(1.7rem, 3.5vw, 2.25rem);
  font-weight: 500;
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin: 0 0 0.8rem;
}

.page h2 {
  font-family: var(--font-serif);
  font-size: 1.35rem;
  font-weight: 500;
  letter-spacing: -0.01em;
  margin: 2.5rem 0 0.8rem;
}

.post h2 {
  font-family: var(--font-serif);
  font-size: 1.4rem;
  font-weight: 500;
  letter-spacing: -0.01em;
  margin: 2.8rem 0 1rem;
}

.post p,
.page p {
  margin: 0 0 1.3rem;
}

.lead {
  font-family: var(--font-serif);
  font-size: 1.2rem;
  line-height: 1.55;
  color: var(--text);
  margin-bottom: 2rem;
}

.page .lead {
  font-size: 1.15rem;
}

.post blockquote {
  border-left: 3px solid var(--accent);
  margin: 2rem 0;
  padding: 0.2rem 0 0.2rem 1.3rem;
  font-family: var(--font-serif);
  font-size: 1.15rem;
  line-height: 1.5;
  color: var(--text-muted);
}

.post ul,
.post ol,
.page ul,
.page ol {
  padding-left: 1.3rem;
  margin: 0 0 1.3rem;
}

.post li,
.page li {
  margin-bottom: 0.5rem;
}

.post code,
.page code {
  font-family: var(--font-mono);
  font-size: 0.87em;
  background: var(--code-bg);
  padding: 0.12em 0.35em;
  border-radius: 3px;
}

.post pre {
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 1rem 1.1rem;
  overflow-x: auto;
  margin: 0 0 1.5rem;
  line-height: 1.5;
}

.post pre code {
  background: none;
  padding: 0;
  font-size: 0.85rem;
}

.post hr,
.page hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 2.5rem 0;
}

.signoff {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  color: var(--text-muted);
}

.post-footer-note {
  color: var(--text-muted);
  font-size: 0.95rem;
}

.back-link {
  margin-top: 2.5rem;
  font-size: 0.95rem;
}

.back-link a {
  border-bottom: none;
  color: var(--text-muted);
}

.back-link a:hover {
  color: var(--accent);
}

/* ---------- Footer ---------- */

.site-footer {
  border-top: 1px solid var(--border);
  margin-top: 5rem;
  padding: 1.5rem 0 2.5rem;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.75rem;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.footer-inner a {
  border-bottom: none;
  color: var(--text-muted);
}

.footer-inner a:hover {
  color: var(--accent);
}

/* ---------- Responsive ---------- */

@media (max-width: 600px) {
  body {
    font-size: 16px;
  }

  .header-inner {
    padding-top: 0.9rem;
    padding-bottom: 0.9rem;
  }

  .nav {
    gap: 1rem;
    font-size: 0.88rem;
  }

  .site-header {
    margin-bottom: 2.5rem;
  }

  .intro {
    margin-bottom: 2.5rem;
  }

  .post-item {
    padding: 1.5rem 0;
  }

  .post-title {
    font-size: 1.3rem;
  }

  .site-footer {
    margin-top: 3rem;
  }

  .footer-inner {
    flex-direction: column;
    align-items: flex-start;
  }
}