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

:root {
  --bg:       #0d1117;
  --surface:  #161c27;
  --surface2: #1d2535;
  --border:   #2a3347;
  --text:     #e4e8f0;
  --muted:    #7a87a0;
  --blue:     #4d90f8;
  --blue-d:   #2f75e8;
  --blue-l:   #162040;
  --orange:   #f97316;
  --orange-d: #e0620a;
  --orange-l: #2d1500;
  --radius:   10px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.ad-banner {
  width: 100%;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 10px;
  min-height: 90px;
}

.top-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 32px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
  gap: 12px;
}

.logo { display: inline-flex; align-items: center; gap: 10px; text-decoration: none; }
.logo-icon {
  width: 36px; height: 36px;
  background: var(--blue); border-radius: 9px;
  display: flex; align-items: center; justify-content: center;
}
.logo-icon svg { fill: #fff; }
.logo-text { font-size: 1.25rem; font-weight: 800; color: var(--blue); letter-spacing: -0.02em; }
.logo-text span { color: var(--text); }

.mini-search { display: flex; gap: 8px; flex-wrap: wrap; }
.mini-search input[type="text"] {
  padding: 9px 12px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  font-size: 0.95rem; color: var(--text);
  background: var(--surface2); outline: none;
}
.mini-search input[type="text"]:focus {
  border-color: var(--blue);
  box-shadow: 0 0 0 3px rgba(77,144,248,.15);
}
.mini-search input[name="keyword"] {
  font-weight: 700; letter-spacing: 0.06em;
  text-transform: uppercase; color: var(--orange); width: 140px;
}
.mini-search input.filter-sm { width: 90px; }
.mini-search button {
  padding: 9px 18px;
  background: var(--orange); color: #fff;
  border: none; border-radius: var(--radius);
  font-weight: 700; font-size: 0.9rem;
  cursor: pointer;
}
.mini-search button:hover { background: var(--orange-d); }

@media (max-width: 600px) {
  .top-bar { padding: 14px 16px; }
  .mini-search input[name="keyword"] { width: 110px; }
  .mini-search input.filter-sm { width: 70px; }
}

main.page-main {
  flex: 1;
  width: 100%;
  max-width: 900px;
  margin: 0 auto;
  padding: 32px 20px 48px;
}

.page-hero { margin-bottom: 28px; }
.page-hero h1 {
  font-size: clamp(1.5rem, 4vw, 2rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 12px;
  line-height: 1.2;
}
.page-hero .lead { color: var(--muted); font-size: 1.05rem; line-height: 1.65; }

.breadcrumb {
  font-size: 0.82rem;
  color: var(--muted);
  margin-bottom: 16px;
}
.breadcrumb a { color: var(--blue); text-decoration: none; }
.breadcrumb a:hover { color: var(--orange); }

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 28px;
  margin-bottom: 28px;
}

.card h2 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 14px;
  color: var(--text);
}

.card p, .card li {
  color: var(--muted);
  line-height: 1.65;
  font-size: 0.95rem;
}

.card p + p { margin-top: 12px; }

.tool-form .field { margin-bottom: 16px; }
.tool-form label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 6px;
}
.tool-form input[type="text"] {
  width: 100%;
  padding: 12px 14px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  font-size: 1rem;
  color: var(--text);
  background: var(--surface2);
  outline: none;
}
.tool-form input[name="keyword"] {
  font-size: 1.2rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--orange);
}
.tool-form button[type="submit"] {
  width: 100%;
  padding: 14px;
  background: var(--orange);
  color: #fff;
  border: none;
  border-radius: var(--radius);
  font-weight: 700;
  font-size: 1rem;
  cursor: pointer;
}
.tool-form button[type="submit"]:hover { background: var(--orange-d); }

.filter-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}
@media (max-width: 520px) { .filter-row { grid-template-columns: 1fr; } }

.examples-list { list-style: none; }
.examples-list li {
  padding: 12px 0;
  border-bottom: 1px solid var(--border);
}
.examples-list li:last-child { border-bottom: none; }
.examples-list a {
  color: var(--orange);
  font-weight: 700;
  text-decoration: none;
  letter-spacing: 0.04em;
}
.examples-list a:hover { color: var(--blue); }
.examples-list .ex-desc { display: block; margin-top: 4px; font-size: 0.88rem; color: var(--muted); }

.faq-item { border-bottom: 1px solid var(--border); padding: 14px 0; }
.faq-item:last-child { border-bottom: none; }
.faq-item h3 { font-size: 0.95rem; font-weight: 700; color: var(--text); margin-bottom: 6px; }
.faq-item p { font-size: 0.9rem; }

.link-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 10px;
}
.link-grid a {
  display: block;
  padding: 10px 12px;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--blue);
  text-decoration: none;
  font-size: 0.88rem;
  font-weight: 600;
}
.link-grid a:hover { border-color: var(--blue); color: var(--orange); }

.word-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 12px 0 20px;
}

.word-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--surface);
  border: 1.5px solid var(--border);
  border-radius: 8px;
  padding: 7px 12px;
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--text);
  text-decoration: none;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}
.word-chip:hover { border-color: var(--blue); color: var(--blue); }
.word-chip .pts {
  font-size: 0.68rem;
  font-weight: 600;
  color: var(--muted);
  background: var(--surface2);
  padding: 2px 5px;
  border-radius: 4px;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
  margin: 12px 0;
}
.data-table th, .data-table td {
  text-align: left;
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
}
.data-table th { color: var(--muted); font-weight: 600; font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.05em; }
.data-table td a { color: var(--blue); text-decoration: none; font-weight: 700; text-transform: uppercase; }
.data-table td a:hover { color: var(--orange); }

.stat-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 16px 0;
}
.stat-pill {
  background: var(--blue-l);
  color: var(--blue);
  padding: 8px 14px;
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 600;
}

.hub-section { margin-bottom: 36px; }
.hub-section h2 { font-size: 1.1rem; margin-bottom: 12px; }

footer.site-footer {
  text-align: center;
  padding: 20px;
  font-size: 0.78rem;
  color: var(--muted);
  border-top: 1px solid var(--border);
}
footer.site-footer a { color: var(--blue); text-decoration: none; }
footer.site-footer a:hover { color: var(--orange); }

/* ── Articles ─────────────────────────────────── */
.article-body h2 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text);
  margin: 1.5rem 0 0.65rem;
}
.article-body h2:first-child { margin-top: 0; }
.article-body p {
  color: var(--muted);
  line-height: 1.7;
  font-size: 0.95rem;
  margin-bottom: 0.85rem;
}
.article-body p a { color: var(--blue); text-decoration: none; font-weight: 600; }
.article-body p a:hover { color: var(--orange); }
.article-body ul {
  margin: 0 0 1rem 1.25rem;
  color: var(--muted);
  line-height: 1.65;
  font-size: 0.93rem;
}
.article-body li { margin-bottom: 0.35rem; }
.article-body li a { color: var(--blue); text-decoration: none; font-weight: 600; }

.article-hub-grid .article-hub-card {
  display: flex;
  flex-direction: column;
  gap: 6px;
  text-align: left;
  line-height: 1.45;
}
.article-hub-grid .article-hub-card strong {
  color: var(--text);
  font-size: 0.92rem;
}
.article-hub-grid .article-hub-card span {
  color: var(--muted);
  font-weight: 400;
  font-size: 0.78rem;
}

.footer-articles {
  max-width: 720px;
  margin: 0 auto 12px;
  line-height: 1.8;
}
.footer-articles-title {
  display: block;
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
  margin-bottom: 4px;
}

.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  border: 0;
}