*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg: #0f1117;
  --surface: #161b22;
  --border: #30363d;
  --text: #c9d1d9;
  --text-muted: #8b949e;
  --accent: #f0b429;
  --accent-hover: #d69e2e;
  --link: #58a6ff;
  --link-hover: #79c0ff;
  --success: #3fb950;
  --warning: #d29922;
  --code-bg: #1c2128;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  font-size: 16px;
}

.container { max-width: 900px; margin: 0 auto; padding: 0 20px; }

header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 24px 0;
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 900px;
  margin: 0 auto;
  padding: 0 20px;
}

.logo {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--accent);
  text-decoration: none;
  letter-spacing: -0.5px;
}

nav { display: flex; gap: 20px; }

nav a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  transition: color 0.2s;
}

nav a:hover, nav a.active { color: var(--accent); }

.breadcrumb {
  font-size: 0.8rem;
  color: var(--text-muted);
  padding: 16px 0 0;
  max-width: 900px;
  margin: 0 auto;
  padding-left: 20px;
  padding-right: 20px;
}

.breadcrumb a { color: var(--link); text-decoration: none; }
.breadcrumb a:hover { text-decoration: underline; }
.breadcrumb span { margin: 0 6px; }

main { padding: 40px 20px 80px; max-width: 900px; margin: 0 auto; }

h1 {
  font-size: 2.2rem;
  font-weight: 800;
  color: #fff;
  margin-bottom: 16px;
  line-height: 1.2;
  letter-spacing: -0.5px;
}

h2 {
  font-size: 1.5rem;
  font-weight: 700;
  color: #fff;
  margin: 40px 0 16px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--border);
}

h3 {
  font-size: 1.15rem;
  font-weight: 600;
  color: #e6edf3;
  margin: 28px 0 12px;
}

p { margin-bottom: 16px; color: var(--text); }

.article-meta {
  display: flex;
  gap: 20px;
  margin-bottom: 32px;
  font-size: 0.85rem;
  color: var(--text-muted);
  flex-wrap: wrap;
}

.article-meta span { display: flex; align-items: center; gap: 6px; }

.article-body > p, .article-body li { color: var(--text); }

.article-body li { margin-bottom: 8px; margin-left: 20px; }

.article-body ul, .article-body ol { margin-bottom: 16px; }

.article-body a {
  color: var(--link);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s;
}

.article-body a:hover { border-bottom-color: var(--link); }

blockquote {
  border-left: 4px solid var(--accent);
  padding: 12px 20px;
  margin: 24px 0;
  background: var(--surface);
  border-radius: 0 8px 8px 0;
  font-style: italic;
  color: var(--text-muted);
}

.rule-box {
  background: rgba(240, 180, 41, 0.08);
  border: 1px solid rgba(240, 180, 41, 0.3);
  border-radius: 10px;
  padding: 20px 24px;
  margin: 24px 0;
}

.rule-box h3 { margin-top: 0; color: var(--accent); }

.step-list { counter-reset: step; list-style: none; margin: 16px 0; }
.step-list li {
  position: relative;
  padding-left: 44px;
  margin-bottom: 20px;
  counter-increment: step;
}
.step-list li::before {
  content: counter(step);
  position: absolute;
  left: 0;
  top: 2px;
  width: 28px;
  height: 28px;
  background: var(--accent);
  color: #000;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.85rem;
}

.hand-ranking-table {
  width: 100%;
  border-collapse: collapse;
  margin: 20px 0;
  font-size: 0.95rem;
}

.hand-ranking-table th {
  background: var(--surface);
  color: var(--accent);
  padding: 12px 16px;
  text-align: left;
  font-weight: 600;
  border-bottom: 2px solid var(--border);
}

.hand-ranking-table td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
}

.hand-ranking-table tr:hover td { background: rgba(255,255,255,0.02); }

.cta-section {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 28px;
  margin: 40px 0;
  text-align: center;
}

.cta-section h2 { border: none; margin: 0 0 12px; }

.btn {
  display: inline-block;
  background: var(--accent);
  color: #000;
  padding: 12px 28px;
  border-radius: 8px;
  text-decoration: none;
  font-weight: 700;
  font-size: 0.95rem;
  transition: background 0.2s, transform 0.1s;
  border: none;
  cursor: pointer;
}

.btn:hover { background: var(--accent-hover); transform: translateY(-1px); }
.btn-outline {
  background: transparent;
  color: var(--accent);
  border: 2px solid var(--accent);
}
.btn-outline:hover { background: rgba(240,180,41,0.1); }

.faq-item { margin-bottom: 24px; }
.faq-item h3 { cursor: pointer; color: var(--link); }
.faq-item h3:hover { color: var(--link-hover); }
.faq-answer { padding-left: 0; overflow: hidden; transition: max-height 0.3s; }

.resource-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 16px;
  margin: 20px 0;
}

.resource-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 20px;
  text-decoration: none;
  color: var(--text);
  transition: border-color 0.2s, transform 0.1s;
  display: block;
}

.resource-card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}

.resource-card h3 { margin: 0 0 8px; color: var(--accent); font-size: 1rem; }
.resource-card p { margin: 0; font-size: 0.85rem; color: var(--text-muted); }

.related-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 16px;
  margin: 20px 0;
}

.related-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 20px;
  text-decoration: none;
  color: var(--text);
  transition: border-color 0.2s;
}

.related-card:hover { border-color: var(--accent); }
.related-card h3 { margin: 0 0 8px; color: var(--link); font-size: 1rem; }
.related-card p { margin: 0; font-size: 0.85rem; color: var(--text-muted); }

.author-box {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 24px;
  margin: 40px 0;
  display: flex;
  gap: 20px;
  align-items: flex-start;
}

.author-avatar {
  width: 56px;
  height: 56px;
  background: var(--accent);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 1.2rem;
  color: #000;
  flex-shrink: 0;
}

.author-info h3 { margin: 0 0 4px; color: #fff; }
.author-info p { margin: 0; font-size: 0.9rem; color: var(--text-muted); }

footer {
  background: var(--surface);
  border-top: 1px solid var(--border);
  padding: 32px 20px;
  margin-top: 60px;
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-muted);
}

footer a { color: var(--link); text-decoration: none; }
footer a:hover { text-decoration: underline; }
footer p { margin-bottom: 8px; }

.toc {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 20px 24px;
  margin-bottom: 32px;
}

.toc h3 { margin: 0 0 12px; color: var(--accent); font-size: 1rem; }
.toc ol { margin: 0; padding-left: 20px; }
.toc li { margin-bottom: 6px; }
.toc a { color: var(--link); text-decoration: none; font-size: 0.9rem; }
.toc a:hover { text-decoration: underline; }

.tag {
  display: inline-block;
  background: rgba(240,180,41,0.12);
  color: var(--accent);
  padding: 3px 10px;
  border-radius: 20px;
  font-size: 0.78rem;
  font-weight: 500;
  margin-right: 4px;
}

.tag-row { margin-bottom: 24px; }

@media (max-width: 640px) {
  h1 { font-size: 1.7rem; }
  h2 { font-size: 1.25rem; }
  nav { display: none; }
  .header-inner { padding: 0 16px; }
  main { padding: 24px 16px 60px; }
  .author-box { flex-direction: column; }
}