/* ============================================================
   FSourceInsight Design System
   Based on: Editorial Grid + Professional Intelligence Dashboard
   Colors: Navy/Blue professional palette with orange accent
   Typography: Inter (UI) + system serif fallback for reading
   ============================================================ */

/* ── Design Tokens ─────────────────────────────────────────── */
:root {
  /* Primary palette */
  --fs-navy: #0F172A;
  --fs-navy-light: #1E293B;
  --fs-blue: #2563EB;
  --fs-blue-light: #3B82F6;
  --fs-blue-muted: #DBEAFE;

  /* Accent / CTA */
  --fs-orange: #E65100;
  --fs-orange-light: #F97316;
  --fs-green: #059669;
  --fs-green-light: #10B981;
  --fs-red: #DC2626;
  --fs-purple: #7C3AED;

  /* Surfaces */
  --fs-bg: #F8FAFC;
  --fs-card: #FFFFFF;
  --fs-card-border: #E2E8F0;
  --fs-muted: #F1F5F9;

  /* Text */
  --fs-text: #0F172A;
  --fs-text-secondary: #64748B;
  --fs-text-muted: #94A3B8;

  /* Spacing */
  --fs-radius: 12px;
  --fs-radius-sm: 8px;
  --fs-radius-lg: 16px;

  /* Transitions */
  --fs-transition: 200ms ease;
}

/* ── Global ────────────────────────────────────────────────── */
body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background-color: var(--fs-bg);
  color: var(--fs-text);
  font-size: 15px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* ── Navbar ─────────────────────────────────────────────────── */
.navbar-fs {
  background: var(--fs-navy) !important;
  padding: 0.6rem 0;
  border-bottom: 1px solid rgba(255,255,255,0.06);
  box-shadow: 0 1px 3px rgba(0,0,0,0.12);
}

.navbar-fs .navbar-brand {
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: -0.3px;
  color: #fff !important;
}

.navbar-fs .navbar-brand .brand-dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--fs-orange-light);
  margin-right: 2px;
  vertical-align: middle;
}

.navbar-fs .nav-link {
  color: rgba(255,255,255,0.7) !important;
  font-weight: 500;
  font-size: 0.875rem;
  padding: 0.5rem 0.85rem !important;
  border-radius: var(--fs-radius-sm);
  transition: var(--fs-transition);
}

.navbar-fs .nav-link:hover,
.navbar-fs .nav-link.active {
  color: #fff !important;
  background: rgba(255,255,255,0.08);
}

.navbar-fs .nav-link .bi {
  font-size: 0.95rem;
  margin-right: 2px;
}

.search-input-fs {
  background: rgba(255,255,255,0.08) !important;
  border: 1px solid rgba(255,255,255,0.1) !important;
  color: #fff !important;
  border-radius: var(--fs-radius-sm) !important;
  font-size: 0.85rem;
  padding: 0.4rem 0.75rem;
  transition: var(--fs-transition);
}

.search-input-fs::placeholder { color: rgba(255,255,255,0.4); }

.search-input-fs:focus {
  background: rgba(255,255,255,0.12) !important;
  border-color: var(--fs-blue) !important;
  box-shadow: 0 0 0 2px rgba(37,99,235,0.25) !important;
}

/* ── Cards ──────────────────────────────────────────────────── */
.card-fs {
  background: var(--fs-card);
  border: 1px solid var(--fs-card-border);
  border-radius: var(--fs-radius);
  box-shadow: 0 1px 2px rgba(0,0,0,0.04);
  transition: var(--fs-transition);
}

.card-fs:hover {
  box-shadow: 0 4px 12px rgba(0,0,0,0.08);
  border-color: #CBD5E1;
}

.card-fs .card-body { padding: 1.25rem; }

/* ── Article Cards ──────────────────────────────────────────── */
.article-card {
  border-left: 3px solid transparent;
}

.article-card.has-highlight {
  border-left-color: var(--fs-orange-light);
  background: linear-gradient(135deg, #FFFBEB 0%, var(--fs-card) 30%);
}

.article-card .article-title {
  font-size: 1.05rem;
  font-weight: 600;
  line-height: 1.4;
  letter-spacing: -0.2px;
  margin-bottom: 0.25rem;
}

.article-card .article-title a {
  color: var(--fs-text);
  text-decoration: none;
  transition: var(--fs-transition);
}

.article-card .article-title a:hover {
  color: var(--fs-blue);
}

.article-card .article-fr {
  font-size: 0.82rem;
  color: var(--fs-text-muted);
  font-style: italic;
}

.article-card .article-summary {
  font-size: 0.9rem;
  color: var(--fs-text-secondary);
  line-height: 1.6;
}

.article-card .article-meta {
  font-size: 0.8rem;
  color: var(--fs-text-muted);
}

.article-card .article-img {
  width: 140px;
  height: 90px;
  object-fit: cover;
  border-radius: var(--fs-radius-sm);
  flex-shrink: 0;
}

/* ── Highlight Badges ───────────────────────────────────────── */
.badge-breakthrough {
  background: var(--fs-orange) !important;
  color: #fff;
  font-weight: 600;
}

.badge-research {
  background: var(--fs-purple) !important;
  color: #fff;
  font-weight: 600;
}

.badge-investment {
  background: var(--fs-green) !important;
  color: #fff;
  font-weight: 600;
}

.badge-event {
  background: var(--fs-red) !important;
  color: #fff;
  font-weight: 600;
}

.badge-source {
  background: var(--fs-navy-light);
  color: #fff;
  font-weight: 500;
}

.badge-category {
  background: var(--fs-blue-muted);
  color: var(--fs-blue);
  font-weight: 500;
}

.badge-company {
  background: var(--fs-muted);
  color: var(--fs-text);
  font-weight: 500;
  border: 1px solid var(--fs-card-border);
}

.badge-stage {
  background: transparent;
  color: var(--fs-text-secondary);
  border: 1px solid var(--fs-card-border);
  font-weight: 400;
  font-size: 0.7rem;
}

/* ── Highlights Section ─────────────────────────────────────── */
.highlights-section {
  background: linear-gradient(135deg, #0F172A 0%, #1E293B 100%);
  border-radius: var(--fs-radius-lg);
  color: #fff;
  overflow: hidden;
}

.highlights-section .hl-header {
  padding: 1rem 1.25rem 0.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.highlights-section .hl-header h6 {
  font-weight: 700;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin: 0;
  color: rgba(255,255,255,0.9);
}

.highlights-section .hl-body { padding: 0.25rem 1.25rem 1rem; }

.highlights-section .hl-item {
  padding: 0.65rem 0;
  border-top: 1px solid rgba(255,255,255,0.08);
  display: flex;
  align-items: flex-start;
  gap: 0.6rem;
}

.highlights-section .hl-item:first-child { border-top: none; }

.highlights-section .hl-item a {
  color: #fff;
  text-decoration: none;
  font-weight: 500;
  font-size: 0.9rem;
  line-height: 1.4;
  transition: var(--fs-transition);
}

.highlights-section .hl-item a:hover { color: var(--fs-orange-light); }

.highlights-section .hl-meta {
  font-size: 0.75rem;
  color: rgba(255,255,255,0.5);
  margin-top: 2px;
}

/* ── Filter Sidebar ─────────────────────────────────────────── */
.filter-card .card-header {
  background: var(--fs-muted);
  border-bottom: 1px solid var(--fs-card-border);
  font-weight: 600;
  font-size: 0.85rem;
  color: var(--fs-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.3px;
  padding: 0.65rem 1rem;
}

.filter-card .form-label {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--fs-text-secondary);
}

.filter-card .form-control,
.filter-card .form-select {
  font-size: 0.85rem;
  border-radius: var(--fs-radius-sm);
  border-color: var(--fs-card-border);
}

.filter-card .form-control:focus,
.filter-card .form-select:focus {
  border-color: var(--fs-blue);
  box-shadow: 0 0 0 2px rgba(37,99,235,0.15);
}

/* ── Buttons ────────────────────────────────────────────────── */
.btn-fs-primary {
  background: var(--fs-blue);
  color: #fff;
  border: none;
  border-radius: var(--fs-radius-sm);
  font-weight: 500;
  font-size: 0.85rem;
  padding: 0.5rem 1rem;
  transition: var(--fs-transition);
}

.btn-fs-primary:hover {
  background: #1D4ED8;
  color: #fff;
}

.btn-fs-ghost {
  background: transparent;
  color: var(--fs-text-secondary);
  border: 1px solid var(--fs-card-border);
  border-radius: var(--fs-radius-sm);
  font-weight: 500;
  font-size: 0.85rem;
  padding: 0.5rem 1rem;
  transition: var(--fs-transition);
}

.btn-fs-ghost:hover {
  background: var(--fs-muted);
  color: var(--fs-text);
  border-color: #CBD5E1;
}

/* Highlight filter pills */
.hl-pill {
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.25rem 0.6rem;
  border-radius: 999px;
  text-decoration: none;
  transition: var(--fs-transition);
  border: 1px solid;
}

.hl-pill-breakthrough { color: var(--fs-orange); border-color: var(--fs-orange); }
.hl-pill-breakthrough:hover { background: var(--fs-orange); color: #fff; }
.hl-pill-research { color: var(--fs-purple); border-color: var(--fs-purple); }
.hl-pill-research:hover { background: var(--fs-purple); color: #fff; }
.hl-pill-investment { color: var(--fs-green); border-color: var(--fs-green); }
.hl-pill-investment:hover { background: var(--fs-green); color: #fff; }
.hl-pill-event { color: var(--fs-red); border-color: var(--fs-red); }
.hl-pill-event:hover { background: var(--fs-red); color: #fff; }

/* ── Detail page ────────────────────────────────────────────── */
.article-detail .article-body {
  font-size: 1rem;
  line-height: 1.8;
  color: #334155;
}

.article-detail .article-body p { margin-bottom: 1.25rem; }

.insight-card {
  border: 1px solid #FDE68A;
  background: linear-gradient(135deg, #FFFBEB 0%, #FFF 40%);
  border-radius: var(--fs-radius);
}

.insight-card .card-header {
  background: transparent;
  border-bottom: 1px solid #FDE68A;
  font-weight: 600;
}

/* Insight content typography */
.insight-content {
  font-size: 0.92rem;
  line-height: 1.7;
  color: var(--fs-text);
}

.insight-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
  margin: 0.6rem 0;
}
.insight-table th {
  background: var(--fs-muted);
  font-weight: 600;
  text-align: left;
  padding: 0.35rem 0.5rem;
  border: 1px solid var(--fs-card-border);
  font-size: 0.82rem;
}
.insight-table td {
  padding: 0.35rem 0.5rem;
  border: 1px solid var(--fs-card-border);
}

/* ── Top Insights Page ──────────────────────────────────────── */
.top-insights-header {
  background: linear-gradient(135deg, #0F172A 0%, #1E293B 100%);
  border-radius: var(--fs-radius-lg);
  padding: 2rem;
  color: #fff;
  margin-bottom: 1.5rem;
}

.top-insights-header h2 {
  font-weight: 700;
  font-size: 1.5rem;
  letter-spacing: -0.3px;
}

.top-insights-header p {
  color: rgba(255,255,255,0.6);
  font-size: 0.9rem;
  margin-bottom: 0;
}

/* ── Footer ─────────────────────────────────────────────────── */
.footer-fs {
  border-top: 1px solid var(--fs-card-border);
  padding: 1.5rem 0;
  color: var(--fs-text-muted);
  font-size: 0.82rem;
  text-align: center;
}

/* ── Responsive ─────────────────────────────────────────────── */
@media (max-width: 768px) {
  .article-card .article-img {
    width: 100px;
    height: 65px;
  }

  .highlights-section .hl-header {
    flex-direction: column;
    gap: 0.5rem;
    align-items: flex-start;
  }
}

/* ── Utilities ──────────────────────────────────────────────── */
.text-fs-muted { color: var(--fs-text-muted); }
.text-fs-secondary { color: var(--fs-text-secondary); }
.bg-fs-muted { background: var(--fs-muted); }