:root {
  --bg-primary: #0b0f19;
  --bg-secondary: #111827;
  --bg-card: #1f2937;
  --border-color: #374151;
  --text-primary: #f3f4f6;
  --text-secondary: #9ca3af;
  --text-muted: #6b7280;
  --accent-cyan: #38bdf8;
  --accent-purple: #a855f7;
  --accent-green: #10b981;
  --accent-blue: #2563eb;
  --code-bg: #111827;
  --font-mono: "JetBrains Mono", "Fira Code", Consolas, Menlo, monospace;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  line-height: 1.75;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent-cyan); text-decoration: none; transition: color 0.2s; }
a:hover { color: #7dd3fc; text-decoration: underline; }
.container { max-width: 980px; margin: 0 auto; padding: 0 20px; }

header.site-header {
  border-bottom: 1px solid var(--border-color);
  background: rgba(17, 24, 39, 0.9);
  backdrop-filter: blur(12px);
  position: sticky;
  top: 0;
  z-index: 100;
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.site-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--text-primary);
}
.site-logo svg { color: var(--accent-cyan); }
.site-nav { display: flex; gap: 24px; }
.site-nav a { color: var(--text-secondary); font-weight: 500; font-size: 0.95rem; }
.site-nav a:hover, .site-nav a.active { color: var(--accent-cyan); text-decoration: none; }

.hero-section { padding: 48px 0 32px; border-bottom: 1px solid var(--border-color); }
.hero-badge {
  display: inline-flex; align-items: center; gap: 6px;
  background: rgba(56, 189, 248, 0.1); color: var(--accent-cyan);
  border: 1px solid rgba(56, 189, 248, 0.25);
  padding: 4px 12px; border-radius: 9999px; font-size: 0.82rem; font-weight: 600; margin-bottom: 16px;
}
.hero-title {
  font-size: 2.2rem; font-weight: 800; letter-spacing: -0.02em; margin-bottom: 12px;
  background: linear-gradient(135deg, #ffffff 40%, var(--accent-cyan) 100%);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
}
.hero-desc { color: var(--text-secondary); font-size: 1.05rem; max-width: 720px; line-height: 1.6; }

.filter-tabs { display: flex; gap: 12px; margin: 32px 0 24px; overflow-x: auto; padding-bottom: 6px; }
.filter-tab {
  background: var(--bg-secondary); border: 1px solid var(--border-color);
  color: var(--text-secondary); padding: 6px 14px; border-radius: 6px;
  font-size: 0.85rem; cursor: pointer; white-space: nowrap; transition: all 0.2s;
}
.filter-tab:hover, .filter-tab.active {
  background: var(--bg-card); color: var(--accent-cyan); border-color: var(--accent-cyan);
}

.posts-grid { display: grid; gap: 20px; margin-bottom: 48px; }
.post-card {
  background: var(--bg-secondary); border: 1px solid var(--border-color);
  border-radius: 8px; padding: 24px; transition: all 0.25s ease;
}
.post-card:hover {
  transform: translateY(-2px); border-color: rgba(56, 189, 248, 0.4);
  box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.3);
}
.post-card-meta {
  display: flex; align-items: center; gap: 12px; font-size: 0.85rem; color: var(--text-muted); margin-bottom: 10px;
}
.post-card-category {
  background: rgba(168, 85, 247, 0.15); color: #c084fc;
  padding: 2px 8px; border-radius: 4px; font-weight: 500; font-size: 0.78rem;
}
.post-card-title { font-size: 1.35rem; font-weight: 700; margin-bottom: 10px; line-height: 1.4; }
.post-card-title a { color: var(--text-primary); }
.post-card-title a:hover { color: var(--accent-cyan); }
.post-card-summary { color: var(--text-secondary); font-size: 0.95rem; line-height: 1.6; margin-bottom: 16px; }
.post-card-footer { display: flex; align-items: center; justify-content: space-between; font-size: 0.85rem; }
.post-tags { display: flex; gap: 8px; flex-wrap: wrap; }
.post-tag { color: var(--text-muted); font-family: var(--font-mono); font-size: 0.78rem; }
.read-more-link { display: inline-flex; align-items: center; gap: 4px; font-weight: 600; color: var(--accent-cyan); }

.post-header { padding: 40px 0 24px; border-bottom: 1px solid var(--border-color); margin-bottom: 36px; }
.post-breadcrumb { font-size: 0.85rem; color: var(--text-muted); margin-bottom: 16px; }
.post-title-main { font-size: 2.2rem; font-weight: 800; line-height: 1.3; margin-bottom: 16px; }
.post-meta-bar { display: flex; flex-wrap: wrap; align-items: center; gap: 16px; font-size: 0.88rem; color: var(--text-muted); }

.post-content { font-size: 1.05rem; line-height: 1.8; color: #e5e7eb; }
.post-content h2 { font-size: 1.5rem; font-weight: 700; margin: 40px 0 16px; padding-bottom: 8px; border-bottom: 1px solid var(--border-color); color: #ffffff; }
.post-content h3 { font-size: 1.25rem; font-weight: 600; margin: 28px 0 12px; color: #f3f4f6; }
.post-content p { margin-bottom: 20px; }
.post-content ul, .post-content ol { margin-bottom: 20px; padding-left: 24px; }
.post-content li { margin-bottom: 8px; }
.post-content code { background: rgba(255, 255, 255, 0.08); font-family: var(--font-mono); font-size: 0.9em; padding: 2px 6px; border-radius: 4px; color: #38bdf8; }
.post-content pre { background: var(--code-bg); border: 1px solid var(--border-color); border-radius: 8px; padding: 16px 20px; overflow-x: auto; margin: 24px 0; }
.post-content pre code { background: none; padding: 0; font-size: 0.9rem; color: #e2e8f0; line-height: 1.6; }
.post-content table { width: 100%; border-collapse: collapse; margin: 28px 0; }
.post-content th, .post-content td { border: 1px solid var(--border-color); padding: 10px 14px; text-align: left; }
.post-content th { background: var(--bg-secondary); font-weight: 600; }

.note-box {
  margin: 40px 0;
  background: linear-gradient(180deg, rgba(31, 41, 55, 0.7) 0%, rgba(17, 24, 39, 0.9) 100%);
  border: 1px solid rgba(56, 189, 248, 0.3); border-radius: 8px; padding: 20px 24px; position: relative;
}
.note-box::before {
  content: ""; position: absolute; top: 0; left: 0; width: 4px; height: 100%;
  background: linear-gradient(180deg, var(--accent-cyan), var(--accent-purple)); border-radius: 8px 0 0 8px;
}
.note-title { display: flex; align-items: center; gap: 8px; font-weight: 700; color: var(--accent-cyan); margin-bottom: 12px; font-size: 1rem; }
.note-box p { font-size: 0.95rem; color: var(--text-secondary); margin-bottom: 14px; }
.note-links { display: flex; align-items: center; flex-wrap: wrap; gap: 16px; }
.btn-soft-link {
  display: inline-flex; align-items: center; gap: 6px;
  background: rgba(56, 189, 248, 0.15); border: 1px solid rgba(56, 189, 248, 0.35);
  color: #7dd3fc; padding: 6px 14px; border-radius: 6px; font-size: 0.88rem; font-weight: 600;
}
.btn-soft-link:hover { background: rgba(56, 189, 248, 0.25); color: #ffffff; text-decoration: none; }
.note-group-info { font-size: 0.85rem; color: var(--text-muted); }
.note-group-info strong { color: #e5e7eb; }

.tools-intro { margin: 32px 0 24px; color: var(--text-secondary); }
.tool-item { background: var(--bg-secondary); border: 1px solid var(--border-color); border-radius: 8px; padding: 24px; margin-bottom: 24px; }
.tool-header { display: flex; justify-content: space-between; align-items: flex-start; margin-bottom: 12px; }
.tool-title { font-size: 1.3rem; font-weight: 700; }
.tool-badge { background: rgba(16, 185, 129, 0.15); color: var(--accent-green); border: 1px solid rgba(16, 185, 129, 0.3); padding: 2px 10px; border-radius: 9999px; font-size: 0.75rem; font-weight: 600; }
.tool-meta { font-size: 0.85rem; color: var(--text-muted); margin-bottom: 12px; }
.tool-desc { color: var(--text-secondary); font-size: 0.95rem; margin-bottom: 18px; }
.tool-actions { display: flex; gap: 12px; margin-bottom: 16px; }
.btn-download { display: inline-flex; align-items: center; gap: 6px; background: var(--accent-blue); color: #ffffff; padding: 8px 16px; border-radius: 6px; font-size: 0.88rem; font-weight: 600; }
.btn-download:hover { background: #1d4ed8; color: #ffffff; text-decoration: none; }
.btn-copy { display: inline-flex; align-items: center; gap: 6px; background: var(--bg-card); border: 1px solid var(--border-color); color: var(--text-primary); padding: 8px 16px; border-radius: 6px; font-size: 0.88rem; cursor: pointer; }
.btn-copy:hover { background: #374151; }
.code-preview { max-height: 220px; overflow-y: auto; border: 1px solid var(--border-color); border-radius: 6px; background: var(--code-bg); padding: 12px 16px; font-family: var(--font-mono); font-size: 0.82rem; color: #cbd5e1; }

footer.site-footer { border-top: 1px solid var(--border-color); padding: 40px 0; margin-top: 60px; color: var(--text-muted); font-size: 0.85rem; }
.footer-inner { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 16px; }
.footer-links { display: flex; gap: 18px; }
.footer-links a { color: var(--text-muted); }
.footer-links a:hover { color: var(--accent-cyan); }
.icp-info { margin-top: 8px; font-size: 0.78rem; color: #4b5563; }

@media (max-width: 640px) {
  .hero-title { font-size: 1.7rem; }
  .post-title-main { font-size: 1.6rem; }
  .header-inner { flex-direction: column; height: auto; padding: 12px 0; gap: 8px; }
  .footer-inner { flex-direction: column; align-items: flex-start; }
}