/* blog.css — shared styling for the blog index and posts.
   Reuses the same palette / theme system as the main site. */
:root {
  --bg: #ffffff;
  --ink: #1b1a18;
  --ink-rgb: 27, 26, 24;
  --accent-rgb: 106, 142, 234;
  --accent: rgb(var(--accent-rgb));
  --logo-stroke: #2b2b2b;
  --c-pink: #ef476f; --c-mint: #06d6a0; --c-orange: #f78c6b; --c-purple: #9b5de5;
  --c-teal: #0cb0a9; --c-yellow: #ffd166; --c-blue: #6a8eea;
  --text: 720px;
  --head: 1000px;
  --pad: 2.5rem;
}
html[data-theme="dark"] {
  --bg: #14151a;
  --ink: #ececf1;
  --ink-rgb: 236, 236, 241;
  --accent-rgb: 138, 166, 240;
  --logo-stroke: #0d0e12;
  --c-pink: #f26889; --c-mint: #33ddb1; --c-orange: #f8a186; --c-purple: #ad7aea;
  --c-teal: #38beb8; --c-yellow: #ffd982; --c-blue: #8aa6f0;
}
*, *::before, *::after { transition: background-color 0.45s ease; }
@media (prefers-reduced-motion: reduce) { *, *::before, *::after { transition: none; } }
@media (max-width: 700px) { :root { --pad: 1.4rem; } }
* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--ink);
  min-height: 100vh;
}

header {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  max-width: var(--head);
  margin: 0 auto;
  padding: 1.5rem var(--pad);
}
.brand { display: flex; align-items: center; gap: 0.7rem; text-decoration: none; color: var(--ink); }
.brand .logo { height: 40px; width: auto; display: block; overflow: visible; }
.brand .logo .tri { fill: var(--c); stroke: var(--logo-stroke); stroke-width: 7; stroke-linejoin: round; }
header .name { font-size: 1.5rem; font-weight: 600; letter-spacing: -0.01em; }

nav { margin-left: auto; display: flex; align-items: center; gap: 2.5rem; }
nav a {
  color: var(--ink); text-decoration: none; font-size: 1.15rem;
  opacity: 0.6; transition: opacity 0.15s ease;
}
nav a:hover { opacity: 1; }

.theme-toggle {
  display: flex; align-items: center; justify-content: center;
  width: 1.7rem; height: 1.7rem; padding: 0;
  background: none; border: 0; cursor: pointer;
  color: var(--ink); opacity: 0.6; transition: opacity 0.15s ease;
  -webkit-tap-highlight-color: transparent;
}
.theme-toggle:hover { opacity: 1; }
.theme-toggle svg { width: 1.2rem; height: 1.2rem; display: block; }
.theme-toggle .icon-sun { display: none; }
html[data-theme="dark"] .theme-toggle .icon-sun { display: block; }
html[data-theme="dark"] .theme-toggle .icon-moon { display: none; }

main { max-width: var(--text); margin: 0 auto; padding: 3rem var(--pad) 2rem; }

.page-title {
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  font-weight: 600; letter-spacing: -0.02em; line-height: 1.1;
}
.page-sub { margin-top: 1rem; font-size: 1.1rem; color: rgba(var(--ink-rgb), 0.6); }

/* Post list */
.post-list { list-style: none; margin-top: 2.5rem; }
.post-item { padding: 1.6rem 0; }
.post-item + .post-item { border-top: 1px solid rgba(var(--ink-rgb), 0.09); }
.post-item a { text-decoration: none; color: var(--ink); display: block; }
.post-item .date {
  font-size: 0.8rem; letter-spacing: 0.05em; text-transform: uppercase;
  color: var(--accent); font-weight: 600;
}
.post-item h2 {
  font-size: 1.35rem; font-weight: 600; letter-spacing: -0.01em; margin-top: 0.4rem;
  transition: color 0.15s ease;
}
.post-item a:hover h2 { color: var(--accent); }
.post-item p { margin-top: 0.5rem; color: rgba(var(--ink-rgb), 0.66); line-height: 1.55; }

/* Single post */
.post-meta {
  font-size: 0.8rem; letter-spacing: 0.05em; text-transform: uppercase;
  color: var(--accent); font-weight: 600; margin-bottom: 0.8rem;
}
article h1 {
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  font-weight: 600; letter-spacing: -0.02em; line-height: 1.15;
}
article h2 {
  font-size: 1.4rem; font-weight: 600; letter-spacing: -0.01em;
  margin-top: 2.4rem; margin-bottom: 0.2rem;
}
article p { font-size: 1.08rem; line-height: 1.7; color: rgba(var(--ink-rgb), 0.82); margin-top: 1.2rem; }
article p strong { color: var(--ink); font-weight: 600; }
article ul, article ol { margin: 1.2rem 0 0 1.4rem; }
article li { font-size: 1.08rem; line-height: 1.7; color: rgba(var(--ink-rgb), 0.82); margin-top: 0.5rem; }
article a {
  color: var(--accent); text-decoration: underline;
  text-decoration-color: rgba(var(--accent-rgb), 0.5); text-underline-offset: 3px;
  transition: text-decoration-color 0.15s ease;
}
article a:hover { text-decoration-color: var(--accent); }
article blockquote {
  margin: 1.4rem 0; padding: 0.2rem 0 0.2rem 1.2rem;
  border-left: 3px solid rgba(var(--accent-rgb), 0.5);
  color: rgba(var(--ink-rgb), 0.7); font-style: italic;
}
article code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.92em; background: rgba(var(--ink-rgb), 0.06);
  padding: 0.1em 0.35em; border-radius: 4px;
}
.back {
  display: inline-block; margin-top: 3rem; font-size: 0.95rem; font-weight: 600;
  color: var(--accent); text-decoration: none;
}
.back:hover { text-decoration: underline; }

footer {
  max-width: var(--text); margin: 0 auto;
  padding: 2.5rem var(--pad);
  border-top: 1px solid rgba(var(--ink-rgb), 0.09);
  font-size: 0.85rem; color: rgba(var(--ink-rgb), 0.45);
}