:root {
  --bg: #f6f7f8;
  --surface: #ffffff;
  --surface-2: #f0f2f4;
  --text: #16181b;
  --text-muted: #66707a;
  --border: #dfe4e8;
  --border-strong: #c8d0d6;
  --accent: #111827;
  --accent-soft: #e8edf2;
  --security: #dbeafe;
  --security-text: #1d4ed8;
  --ppc: #fef3c7;
  --ppc-text: #b45309;
  --openclaw: #e9d5ff;
  --openclaw-text: #7e22ce;
  --ai: #ccfbf1;
  --ai-text: #0f766e;
  --shadow: 0 8px 30px rgba(15, 23, 42, 0.06);
  --radius: 18px;
  --radius-sm: 12px;
  --content: 1200px;
  --font-sans: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-sans);
  color: var(--text);
  background: radial-gradient(circle at top left, rgba(255,255,255,0.9), transparent 28%), linear-gradient(180deg, #fbfcfd 0%, var(--bg) 100%);
}
a { color: inherit; text-decoration: none; }
button, input, select { font: inherit; }
.page-shell { width: min(calc(100% - 2rem), var(--content)); margin: 0 auto; }
.site-header { padding: 1rem 0 0; }
.topbar {
  display: flex; align-items: center; justify-content: space-between; gap: 1rem;
  padding: 0.9rem 1.1rem; border: 1px solid var(--border);
  background: rgba(255,255,255,0.82); backdrop-filter: blur(12px);
  border-radius: 999px; box-shadow: var(--shadow); position: sticky; top: 1rem; z-index: 20;
}
.brand-block { display: grid; gap: 0.2rem; }
.eyebrow { font-size: 0.72rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--text-muted); }
.brand-title { font-size: 1rem; font-weight: 700; }
.topbar-links { display: flex; align-items: center; gap: 0.6rem; flex-wrap: wrap; }
.topbar-links a { color: var(--text-muted); padding: 0.55rem 0.9rem; border-radius: 999px; transition: background 140ms ease, color 140ms ease; }
.topbar-links a:hover, .topbar-links a.is-active { background: var(--accent-soft); color: var(--text); }
.hero { display: grid; grid-template-columns: minmax(0, 1.35fr) minmax(280px, 0.65fr); gap: 1.25rem; padding: 2rem 0 1.5rem; }
.hero-card, .panel, .news-card { background: rgba(255,255,255,0.88); border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow); }
.hero-card { padding: 2rem; }
.hero-title { margin: 0; font-size: clamp(2.2rem, 4.3vw, 4.5rem); line-height: 0.98; letter-spacing: -0.04em; max-width: 12ch; }
.hero-copy { margin: 1rem 0 0; max-width: 60ch; color: var(--text-muted); font-size: 1.05rem; }
.hero-meta { display: flex; flex-wrap: wrap; gap: 0.75rem; margin-top: 1.4rem; }
.meta-pill { padding: 0.6rem 0.9rem; border-radius: 999px; background: var(--surface-2); color: var(--text-muted); font-size: 0.92rem; }
.summary-panel { padding: 1.4rem; display: grid; gap: 1rem; }
.summary-panel h2, .panel h2, .archive-header h2 { margin: 0; font-size: 1rem; }
.metric-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0.8rem; }
.metric { padding: 0.95rem; border-radius: var(--radius-sm); background: var(--surface-2); border: 1px solid var(--border); }
.metric strong { display: block; font-size: 1.3rem; line-height: 1; margin-bottom: 0.35rem; }
.metric span { color: var(--text-muted); font-size: 0.9rem; }
.controls-grid { display: grid; grid-template-columns: 320px minmax(0, 1fr); gap: 1.25rem; align-items: start; padding-bottom: 3rem; }
.filters-panel, .archive-panel { padding: 1.2rem; }
.panel-label { display: block; margin-bottom: 0.55rem; font-size: 0.85rem; font-weight: 600; }
.filter-group + .filter-group { margin-top: 1rem; }
.search-input, .select-input, .date-input {
  width: 100%; border: 1px solid var(--border-strong); background: var(--surface);
  color: var(--text); border-radius: 12px; padding: 0.85rem 0.95rem;
}
.date-row { display: grid; grid-template-columns: 1fr 1fr; gap: 0.75rem; }
.topic-pills { display: flex; gap: 0.55rem; flex-wrap: wrap; }
.topic-pill {
  border: 1px solid var(--border-strong); border-radius: 999px; padding: 0.65rem 0.9rem;
  background: var(--surface); color: var(--text-muted); transition: all 140ms ease;
}
.topic-pill.is-active, .topic-pill:hover { background: var(--accent); border-color: var(--accent); color: white; }
.archive-header { display: flex; align-items: center; justify-content: space-between; gap: 1rem; padding-bottom: 1rem; margin-bottom: 1rem; border-bottom: 1px solid var(--border); }
.results-meta { color: var(--text-muted); font-size: 0.92rem; }
.news-list { display: grid; gap: 1rem; }
.news-card { padding: 1.15rem 1.2rem; transition: transform 150ms ease, box-shadow 150ms ease, border-color 150ms ease; }
.news-card:hover { transform: translateY(-2px); box-shadow: 0 12px 32px rgba(15, 23, 42, 0.08); border-color: var(--border-strong); }
.card-topline { display: flex; align-items: center; justify-content: space-between; gap: 1rem; margin-bottom: 0.65rem; flex-wrap: wrap; }
.card-meta { display: flex; align-items: center; gap: 0.6rem; flex-wrap: wrap; color: var(--text-muted); font-size: 0.9rem; }
.news-tag { display: inline-flex; align-items: center; padding: 0.38rem 0.65rem; border-radius: 999px; font-size: 0.78rem; font-weight: 700; letter-spacing: 0.02em; }
.news-tag.security { background: var(--security); color: var(--security-text); }
.news-tag.ppc { background: var(--ppc); color: var(--ppc-text); }
.news-tag.openclaw { background: var(--openclaw); color: var(--openclaw-text); }
.news-tag.ai { background: var(--ai); color: var(--ai-text); }
.news-title { margin: 0; font-size: 1.15rem; line-height: 1.25; }
.news-title a:hover { text-decoration: underline; }
.news-summary { margin: 0.6rem 0 0.9rem; color: var(--text-muted); display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.card-footer { display: flex; align-items: center; justify-content: space-between; gap: 1rem; flex-wrap: wrap; }
.source-link { font-weight: 600; color: var(--accent); }
.source-link:hover { text-decoration: underline; }
.archive-list { display: grid; gap: 0.65rem; }
.archive-item { display: flex; align-items: center; justify-content: space-between; gap: 1rem; padding: 0.9rem 1rem; background: var(--surface-2); border-radius: 14px; border: 1px solid var(--border); }
.archive-item strong { display: block; }
.archive-item span { color: var(--text-muted); font-size: 0.9rem; }
.site-footer { padding: 0 0 2.5rem; color: var(--text-muted); font-size: 0.92rem; }
@media (max-width: 980px) { .hero, .controls-grid { grid-template-columns: 1fr; } .hero-title { max-width: none; } }
@media (max-width: 720px) {
  .topbar { border-radius: 24px; align-items: start; flex-direction: column; }
  .topbar-links { width: 100%; justify-content: space-between; }
  .hero-card, .summary-panel, .filters-panel, .archive-panel, .news-card { padding: 1rem; }
  .metric-grid, .date-row { grid-template-columns: 1fr; }
}