:root {
  --bg: #ffffff;
  --fg: #1f2430;
  --muted: #6b7280;
  --accent: #0f766e;
  --accent-soft: #ccfbf1;
  --border: #e5e7eb;
  --card-bg: #f9fafb;
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--fg);
  background: var(--bg);
  line-height: 1.6;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

img { max-width: 100%; }

.container { max-width: 880px; margin: 0 auto; padding: 0 1.25rem; }

.site-header {
  border-bottom: 1px solid var(--border);
  background: var(--bg);
  position: sticky;
  top: 0;
  z-index: 10;
}
.header-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem 1.5rem;
  padding-top: 0.9rem;
  padding-bottom: 0.9rem;
}
.site-brand {
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--fg);
  margin-right: auto;
}
.site-nav { display: flex; gap: 1rem; }
.site-nav a { color: var(--fg); font-weight: 500; }
.lang-switcher { display: flex; gap: 0.5rem; flex-wrap: wrap; }
.lang-switcher a {
  color: var(--muted);
  font-size: 0.85rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.2rem 0.7rem;
}
.lang-switcher a.active { color: #fff; background: var(--accent); border-color: var(--accent); }

.site-main { padding: 2rem 0 3rem; }
.site-footer { border-top: 1px solid var(--border); padding: 1.5rem 0; color: var(--muted); font-size: 0.9rem; }
.footer-text { margin: 0; }

.hero { padding: 0.5rem 0 1.5rem; }
.hero h1 { font-size: 2rem; margin: 0 0 0.4rem; line-height: 1.2; }
.hero-subtitle { color: var(--muted); margin: 0; }

.page-title { font-size: 1.7rem; margin: 0 0 1rem; }
.section-title { font-size: 1.3rem; margin: 1.5rem 0 1rem; }

.post-grid { display: grid; grid-template-columns: 1fr; gap: 1rem; }
@media (min-width: 640px) {
  .post-grid { grid-template-columns: 1fr 1fr; }
}

.post-card {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.1rem 1.2rem;
  background: var(--card-bg);
}
.post-card-title { font-size: 1.05rem; margin: 0 0 0.4rem; line-height: 1.3; }
.post-card-title a { color: var(--fg); }
.post-card-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 0.75rem;
  color: var(--muted);
  font-size: 0.85rem;
  margin-bottom: 0.5rem;
}
.post-card-summary { color: var(--muted); font-size: 0.95rem; margin: 0; }
.post-card-summary p { margin: 0; }

.category-list { list-style: none; padding: 0; margin: 0; }
.category-list li {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--border);
}
.category-list .count { color: var(--muted); font-size: 0.85rem; }

.post { max-width: 760px; }
.post-header { margin-bottom: 1.5rem; }
.post-header h1 { font-size: 1.9rem; line-height: 1.25; margin: 0 0 0.6rem; }
.post-meta { color: var(--muted); font-size: 0.9rem; display: flex; flex-wrap: wrap; gap: 0.4rem 0.8rem; }

.draft-badge {
  display: inline-block;
  background: #fef3c7;
  color: #92400e;
  border-radius: 6px;
  padding: 0.2rem 0.6rem;
  font-size: 0.8rem;
  margin-bottom: 1rem;
}

.post-image img { width: 100%; height: auto; border-radius: 10px; }

.toc {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1rem 1.25rem;
  margin: 1.5rem 0;
  background: var(--card-bg);
}
.toc h2 { font-size: 1rem; margin: 0 0 0.6rem; }
.toc ul { margin: 0; padding-left: 1.25rem; }
.toc a { color: var(--fg); }

.post-content { font-size: 1.02rem; }
.post-content h2 { margin-top: 2rem; }
.post-content h3 { margin-top: 1.5rem; }
.post-content blockquote {
  border-left: 3px solid var(--accent-soft);
  margin-left: 0;
  padding-left: 1rem;
  color: var(--muted);
}
.post-content pre {
  background: #0f172a;
  color: #e2e8f0;
  padding: 1rem;
  border-radius: 8px;
  overflow-x: auto;
}
.post-content code { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; }

.faq { margin-top: 2.5rem; border-top: 1px solid var(--border); padding-top: 1.5rem; }
.faq h2 { font-size: 1.4rem; }
.faq details {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.75rem 1rem;
  margin-bottom: 0.6rem;
  background: var(--card-bg);
}
.faq summary { cursor: pointer; font-weight: 600; }
.faq details p { margin: 0.5rem 0 0; }

.page-content { margin-bottom: 1.5rem; }

.error-page { text-align: center; padding: 3rem 0; }
.error-code {
  font-size: 5rem;
  font-weight: 800;
  line-height: 1;
  color: var(--accent);
  margin: 0 0 0.5rem;
}
.error-title { font-size: 1.6rem; margin: 0 0 0.6rem; }
.error-text { color: var(--muted); margin: 0 0 1.75rem; }
.error-actions { display: flex; gap: 0.75rem; justify-content: center; flex-wrap: wrap; }
.btn {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  padding: 0.6rem 1.25rem;
  border-radius: 8px;
  font-weight: 600;
}
.btn:hover { text-decoration: none; opacity: 0.9; }
.btn-ghost { background: transparent; color: var(--accent); border: 1px solid var(--accent); }
.btn-ghost:hover { background: var(--accent-soft); }