:root {
  --bg: #fafaf8;
  --surface: #ffffff;
  --text: #1c1d21;
  --muted: #6a6e78;
  --line: #e6e6e1;
  --accent: #0f766e;
  --accent-soft: #e3f4f1;
  --radius: 14px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111317;
    --surface: #181b21;
    --text: #e8e9ec;
    --muted: #9aa0ab;
    --line: #272b33;
    --accent: #3ccfc0;
    --accent-soft: #14312f;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.7 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Inter, Helvetica, Arial, sans-serif;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
img, iframe { max-width: 100%; }
.wrap { width: 100%; max-width: 860px; margin: 0 auto; padding: 0 20px; }

.site-header { border-bottom: 1px solid var(--line); background: var(--surface); position: sticky; top: 0; z-index: 10; }
.bar { display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap; padding-top: 14px; padding-bottom: 14px; }
.brand { font-weight: 800; font-size: 1.25rem; color: var(--text); letter-spacing: -0.02em; }
.brand:hover { text-decoration: none; }
.logo { color: var(--accent); }
nav { display: flex; gap: 18px; flex-wrap: wrap; font-size: 0.93rem; }
nav a { color: var(--muted); }
nav a:hover { color: var(--accent); text-decoration: none; }

main { padding-top: 28px; padding-bottom: 56px; min-height: 60vh; }
.hero { padding: 28px 0 10px; }
.hero h1 { font-size: clamp(2rem, 5vw, 2.8rem); line-height: 1.15; margin: 0 0 10px; letter-spacing: -0.03em; }
.hero p { color: var(--muted); font-size: 1.1rem; margin: 0; max-width: 60ch; }
h2.section { font-size: 1.1rem; text-transform: uppercase; letter-spacing: 0.08em; color: var(--muted); margin: 34px 0 14px; }

.grid { display: grid; gap: 16px; grid-template-columns: 1fr; }
@media (min-width: 640px) { .grid { grid-template-columns: 1fr 1fr; } }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 20px; transition: transform .15s, border-color .15s; }
.card:hover { transform: translateY(-2px); border-color: var(--accent); }
.card h2 { font-size: 1.15rem; line-height: 1.35; margin: 6px 0 8px; }
.card h2 a { color: var(--text); }
.card p { color: var(--muted); font-size: 0.95rem; margin: 0 0 12px; line-height: 1.55; }
.cat { display: inline-block; font-size: 0.75rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.08em; color: var(--accent); }
.meta { color: var(--muted); font-size: 0.85rem; }
.more { margin-top: 24px; font-weight: 600; }

.post h1 { font-size: clamp(1.8rem, 4.5vw, 2.5rem); line-height: 1.2; letter-spacing: -0.025em; margin: 8px 0 10px; }
.content { margin-top: 22px; }
.content h2 { font-size: 1.5rem; line-height: 1.3; margin: 2em 0 0.5em; letter-spacing: -0.015em; }
.content h3 { font-size: 1.2rem; margin: 1.6em 0 0.4em; }
.content p, .content ul, .content ol { margin: 0 0 1.1em; }
.content li { margin-bottom: 0.35em; }
.content blockquote { margin: 1.4em 0; padding: 4px 18px; border-left: 4px solid var(--accent); background: var(--accent-soft); border-radius: 0 10px 10px 0; }
.content blockquote p { margin: 0.6em 0; }
.content code { background: var(--accent-soft); padding: 2px 6px; border-radius: 6px; font-size: 0.9em; }
.content pre { background: #0d1117; color: #e6edf3; padding: 16px; border-radius: 12px; overflow-x: auto; font-size: 0.9rem; line-height: 1.55; }
.content pre code { background: none; padding: 0; color: inherit; }
.content hr { border: none; border-top: 1px solid var(--line); margin: 2em 0; }
.content img { border-radius: 12px; height: auto; }
.table-wrap { overflow-x: auto; margin: 0 0 1.2em; }
table { border-collapse: collapse; width: 100%; font-size: 0.95rem; }
th, td { border: 1px solid var(--line); padding: 10px 12px; text-align: left; }
th { background: var(--accent-soft); }

.video { position: relative; padding-top: 56.25%; margin: 22px 0 6px; border-radius: var(--radius); overflow: hidden; background: #000; }
.video iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; }

.tags { margin-top: 28px; display: flex; gap: 8px; flex-wrap: wrap; }
.tag { background: var(--accent-soft); color: var(--accent); padding: 3px 12px; border-radius: 999px; font-size: 0.8rem; font-weight: 600; }
.related { margin-top: 56px; }
.related h2 { font-size: 1.3rem; }

.archive { list-style: none; padding: 0; }
.archive li { padding: 8px 0; border-bottom: 1px solid var(--line); }
.archive span { display: inline-block; width: 70px; color: var(--muted); font-size: 0.9rem; }

.ad { margin: 24px 0; text-align: center; overflow: hidden; min-height: 0; }

.site-footer { border-top: 1px solid var(--line); background: var(--surface); padding: 28px 0; color: var(--muted); font-size: 0.9rem; }
.site-footer p { margin: 4px 0; }
.site-footer a { color: var(--muted); }
.site-footer a:hover { color: var(--accent); }