:root {
  --brand: #f97316;        /* orange-500 */
  --brand-hover: #ea580c;  /* orange-600 */
  --brand-dark: #c2410c;   /* orange-700 */
  --brand-50: #fff7ed;
  --brand-100: #ffedd5;
  --brand-200: #fed7aa;
  --brand-300: #fdba74;
  --text: #111827;         /* gray-900 */
  --text-2: #4b5563;       /* gray-600 */
  --muted: #6b7280;        /* gray-500 */
  --border: #e5e7eb;       /* gray-200 */
  --border-strong: #d1d5db;/* gray-300 */
  --bg: #f9fafb;           /* gray-50 */
  --card: #ffffff;
  --success: #16a34a;      /* green-600 */
  --success-50: #f0fdf4;
  --success-200: #bbf7d0;
  --danger: #dc2626;       /* red-600 */
  --danger-50: #fef2f2;
  --danger-200: #fecaca;
  --footer-bg: #111827;    /* gray-900 */
  --shadow-sm: 0 1px 2px rgba(17, 24, 39, 0.05);
  --shadow-md: 0 4px 12px rgba(17, 24, 39, 0.08);
  --shadow-lg: 0 12px 32px rgba(17, 24, 39, 0.10);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  overflow-x: hidden;
}

/* ---------- Site header (mirrors deepresearcher) ---------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}
.site-header-inner {
  max-width: 1100px;
  margin: 0 auto;
  height: 64px;
  padding: 0 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  text-decoration: none;
  font-weight: 800;
  font-size: 1.15rem;
  letter-spacing: -0.02em;
}
.brand-icon {
  width: 30px;
  height: 30px;
  border-radius: 8px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--brand), var(--brand-dark));
  color: #fff;
  flex-shrink: 0;
}
.brand-text {
  background: linear-gradient(90deg, var(--brand), var(--brand-dark));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.header-link {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-2);
  text-decoration: none;
  padding: 0.45rem 0.9rem;
  border-radius: 8px;
  transition: color 0.15s ease, background 0.15s ease;
}
.header-link:hover { color: var(--brand-hover); background: var(--brand-50); }
.header-cta {
  font-size: 0.9rem;
  font-weight: 600;
  color: #fff;
  background: var(--brand);
  text-decoration: none;
  padding: 0.45rem 1rem;
  border-radius: 8px;
  box-shadow: var(--shadow-sm);
  transition: background 0.15s ease;
}
.header-cta:hover { background: var(--brand-hover); }
.header-nav { display: flex; align-items: center; gap: 0.5rem; }

.lang-toggle {
  padding: 0.35rem 0.75rem;
  font-size: 0.8rem;
  font-weight: 600;
  font-family: inherit;
  color: var(--text-2);
  background: #fff;
  border: 1px solid var(--border-strong);
  border-radius: 999px;
  cursor: pointer;
  transition: all 0.15s ease;
}
.lang-toggle:hover { border-color: var(--brand-300); color: var(--brand-hover); background: var(--brand-50); }

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: calc(64px + 2.5rem) 1rem 2.5rem;
}

/* ---------- Hero ---------- */
.hero {
  text-align: center;
  margin-bottom: 2.5rem;
}
.hero-icon {
  width: 72px;
  height: 72px;
  margin: 0 auto 1.25rem;
  border-radius: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--brand), var(--brand-dark));
  color: #fff;
  box-shadow: 0 10px 28px rgba(249, 115, 22, 0.3);
}
.hero h1 {
  margin: 0;
  font-size: 3rem;
  font-weight: 800;
  letter-spacing: -0.04em;
  background: linear-gradient(90deg, var(--brand), var(--brand-dark));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.subtitle {
  margin: 0.6rem auto 1.4rem;
  color: var(--text-2);
  font-size: 1.1rem;
  max-width: 560px;
}

/* ---------- Cards ---------- */
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 1.75rem;
  margin-bottom: 1.5rem;
  box-shadow: var(--shadow-sm);
  transition: box-shadow 0.25s ease, border-color 0.25s ease;
}
.card:hover {
  border-color: var(--border-strong);
  box-shadow: var(--shadow-md);
}

/* ---------- Status bar ---------- */
.status-bar {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  border-radius: 999px;
  background: var(--card);
  border: 1px solid var(--border);
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--muted);
  box-shadow: var(--shadow-sm);
}
.status-bar.ok {
  background: var(--success-50);
  border-color: var(--success-200);
  color: var(--success);
}
.status-bar.err {
  background: var(--danger-50);
  border-color: var(--danger-200);
  color: var(--danger);
}

.spinner {
  width: 14px;
  height: 14px;
  border: 2px solid var(--border-strong);
  border-top-color: currentColor;
  border-radius: 50%;
  animation: spin 1s linear infinite;
  flex-shrink: 0;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ---------- Search form ---------- */
.search-form label { display: block; margin-bottom: 0.4rem; font-weight: 600; color: var(--text-2); font-size: 0.875rem; }

.search-form input[type="text"],
.search-form input[type="number"] {
  width: 100%;
  padding: 0.8rem 1rem;
  border: 1px solid var(--border-strong);
  border-radius: 10px;
  background: #fff;
  color: var(--text);
  font-size: 1.05rem;
  font-family: inherit;
  outline: none;
  transition: border-color 0.15s, box-shadow 0.15s;
}
.search-form input[type="text"]::placeholder { color: #9ca3af; }
.search-form input[type="text"]:focus,
.search-form input[type="number"]:focus {
  border-color: var(--brand);
  box-shadow: 0 0 0 3px rgba(249, 115, 22, 0.15);
}
.search-form input[type="text"] { font-size: 1.1rem; text-align: center; letter-spacing: 0.01em; }

.row { display: flex; gap: 1rem; margin: 1.25rem 0; }
.row .field { flex: 1; }
.field-timeout { max-width: 130px; }

.checkbox-group { display: flex; gap: 0.75rem; flex-wrap: wrap; }
.chip {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.5rem 1rem;
  border: 1px solid var(--border-strong);
  border-radius: 999px;
  cursor: pointer;
  user-select: none;
  font-weight: 500;
  font-size: 0.9rem;
  color: var(--text-2);
  background: #fff;
  transition: all 0.15s ease;
}
.chip:hover { border-color: var(--brand-300); color: var(--brand-hover); }
.chip input { accent-color: var(--brand); margin: 0; }
.chip:has(input:checked) {
  border-color: var(--brand);
  background: var(--brand-50);
  color: var(--brand-hover);
  font-weight: 600;
}

button {
  border: none;
  border-radius: 10px;
  padding: 0.8rem 1.4rem;
  font-size: 1rem;
  font-family: inherit;
  cursor: pointer;
  transition: all 0.15s ease;
  font-weight: 600;
}

.btn-primary {
  width: 100%;
  background: var(--brand);
  color: #fff;
  box-shadow: 0 4px 14px rgba(249, 115, 22, 0.3);
  position: relative;
  overflow: hidden;
}
.btn-primary:hover { background: var(--brand-hover); transform: translateY(-1px); box-shadow: 0 8px 22px rgba(249, 115, 22, 0.35); }
.btn-primary:disabled { opacity: 0.65; cursor: not-allowed; transform: none; }
.btn-primary::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.25), transparent);
  transform: translateX(-100%);
}
.btn-primary:hover::after { animation: shine 0.8s ease; }
@keyframes shine { to { transform: translateX(100%); } }

.btn-secondary {
  background: #fff;
  color: var(--text-2);
  border: 1px solid var(--border-strong);
  box-shadow: var(--shadow-sm);
}
.btn-secondary:hover { border-color: var(--brand-300); color: var(--brand-hover); background: var(--brand-50); }

.btn-text {
  background: transparent;
  color: var(--brand-hover);
  padding: 0.3rem 0.6rem;
  font-size: 0.85rem;
  font-weight: 500;
}
.btn-text:hover { background: var(--brand-50); }

/* ---------- Loading scanner ---------- */
.loading-card { text-align: center; padding: 3rem 1.5rem; }
.scanner {
  position: relative;
  width: 140px;
  height: 140px;
  margin: 0 auto 1.5rem;
}
.scanner-ring {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  border: 3px solid var(--brand-100);
  border-top-color: var(--brand);
  animation: scan-rotate 1.6s linear infinite;
}
.scanner-ring-2 {
  inset: 16px;
  border-color: var(--border);
  border-top-color: var(--brand-300);
  animation-duration: 1.1s;
  animation-direction: reverse;
}
.scanner-core {
  position: absolute;
  inset: 42px;
  border-radius: 50%;
  background: radial-gradient(circle, var(--brand) 0%, transparent 70%);
  opacity: 0.25;
  animation: pulse 1.5s ease-in-out infinite;
}
@keyframes scan-rotate { to { transform: rotate(360deg); } }
@keyframes pulse { 0%,100% { transform: scale(0.9); opacity: 0.18; } 50% { transform: scale(1.08); opacity: 0.35; } }

.scan-text { margin: 0; font-size: 1.35rem; font-weight: 700; letter-spacing: -0.01em; color: var(--text); }
.scan-subtext { margin: 0.5rem 0 0; color: var(--muted); }

/* ---------- Dashboard ---------- */
.dashboard { animation: fadeIn 0.5s ease; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(12px); } to { opacity: 1; transform: translateY(0); } }

.stat-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin-bottom: 1.5rem;
}
.stat-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 1.5rem 1rem;
  text-align: center;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}
.stat-card::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--brand), var(--brand-300));
}
.stat-value {
  font-size: 2.6rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--brand-hover);
  line-height: 1.1;
}
.stat-label { color: var(--muted); font-size: 0.9rem; font-weight: 500; margin-top: 0.3rem; }

.viz-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  margin-bottom: 1.5rem;
}
.viz-row .card, .network-card { margin-bottom: 0; }
.network-card { margin-bottom: 1.5rem; }
.viz-title {
  margin: 0 0 1rem;
  font-size: 1.05rem;
  color: var(--text);
  font-weight: 700;
  letter-spacing: -0.01em;
}
.viz-card { min-height: 260px; }

/* ---------- Engine chart ---------- */
.engine-chart {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1.75rem;
  flex-wrap: wrap;
  min-height: 180px;
}
.donut {
  width: 140px;
  height: 140px;
  border-radius: 50%;
  position: relative;
  background: conic-gradient(var(--brand) var(--a-deg), var(--border-strong) 0);
  box-shadow: var(--shadow-sm);
}
.donut::before {
  content: "";
  position: absolute;
  inset: 28px;
  border-radius: 50%;
  background: #fff;
  border: 1px solid var(--border);
}
.donut-label {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 1.25rem;
  color: var(--text);
}
.chart-legend { display: flex; flex-direction: column; gap: 0.55rem; }
.legend-item { display: flex; align-items: center; gap: 0.5rem; font-size: 0.9rem; font-weight: 500; color: var(--text-2); }
.legend-dot { width: 10px; height: 10px; border-radius: 50%; }

/* ---------- Tag cloud ---------- */
.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  align-content: flex-start;
  min-height: 180px;
}
.cloud-tag {
  padding: 0.3rem 0.8rem;
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 500;
  border: 1px solid var(--brand-200);
  background: var(--brand-50);
  color: var(--brand-dark);
  animation: floatIn 0.45s ease both;
  transition: transform 0.15s, box-shadow 0.15s;
}
.cloud-tag:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); }
@keyframes floatIn { from { opacity: 0; transform: translateY(8px) scale(0.95); } to { opacity: 1; transform: translateY(0) scale(1); } }

/* ---------- Network graph ---------- */
.network-card { padding-bottom: 1rem; }
.network-graph {
  width: 100%;
  height: 360px;
  border-radius: 12px;
  background: var(--bg);
  border: 1px solid var(--border);
  overflow: hidden;
}
.network-graph svg { width: 100%; height: 100%; }
.node-center { fill: url(#centerGradient); }
.node-a { fill: var(--brand); }
.node-b { fill: #9ca3af; }
.link { stroke: var(--border-strong); stroke-width: 1.5; }
.node-label { fill: var(--text-2); font-size: 11px; font-weight: 500; text-anchor: middle; pointer-events: none; }

/* ---------- Results cards ---------- */
.results-card { animation: fadeIn 0.6s ease; }
.results-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 1.25rem;
}
.results-header h3 { margin: 0; font-size: 1.3rem; font-weight: 700; letter-spacing: -0.01em; }

.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1rem;
}
.result-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 1.1rem;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
  animation: cardIn 0.45s ease both;
  text-decoration: none;
  display: block;
}
@keyframes cardIn {
  from { opacity: 0; transform: translateY(16px) scale(0.97); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}
.result-card:hover {
  transform: translateY(-3px);
  border-color: var(--brand-300);
  box-shadow: var(--shadow-lg);
}
.card-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 0.5rem;
  margin-bottom: 0.55rem;
}
.card-site {
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: -0.01em;
  color: var(--text);
}
.card-engine {
  font-size: 0.68rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: 0.2rem 0.55rem;
  border-radius: 999px;
  flex-shrink: 0;
}
.card-engine.deepSourceA { background: var(--brand-50); color: var(--brand-hover); border: 1px solid var(--brand-200); }
.card-engine.deepSourceB { background: #f3f4f6; color: var(--text-2); border: 1px solid var(--border); }
.card-url {
  font-size: 0.82rem;
  color: var(--brand-hover);
  word-break: break-all;
  margin-bottom: 0.7rem;
  line-height: 1.45;
}
.card-tags { display: flex; flex-wrap: wrap; gap: 0.35rem; }
.card-tag {
  font-size: 0.72rem;
  font-weight: 500;
  padding: 0.15rem 0.5rem;
  border-radius: 999px;
  background: #f3f4f6;
  color: var(--muted);
}

/* ---------- Log ---------- */
.log-card { animation: fadeIn 0.5s ease; }
.log-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.75rem;
}
.log-header h3 { margin: 0; font-size: 1rem; font-weight: 700; }
.log {
  background: #111827;
  border: 1px solid #1f2937;
  border-radius: 10px;
  padding: 0.85rem 1rem;
  height: 180px;
  overflow-y: auto;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 0.8rem;
  line-height: 1.55;
  color: #d1d5db;
  white-space: pre-wrap;
}
.log.collapsed { height: 0; padding: 0; border: none; overflow: hidden; }

.muted { color: var(--muted); }
.hidden { display: none !important; }

/* ---------- Footer (mirrors deepresearcher dark footer) ---------- */
.site-footer {
  background: var(--footer-bg);
  color: #9ca3af;
  text-align: center;
  font-size: 0.85rem;
  padding: 2.5rem 1rem;
  margin-top: 1rem;
}
.site-footer p { margin: 0.25rem 0; }
.site-footer .footer-brand {
  font-weight: 700;
  background: linear-gradient(90deg, var(--brand-300), var(--brand));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* ---------- Responsive ---------- */
@media (max-width: 800px) {
  .viz-row { grid-template-columns: 1fr; }
  .hero h1 { font-size: 2.3rem; }
}

@media (max-width: 600px) {
  .row { flex-direction: column; gap: 0.75rem; }
  .field-timeout { max-width: 100%; }
  .stat-grid { grid-template-columns: 1fr; }
  .cards-grid { grid-template-columns: 1fr; }
  .results-header { flex-direction: column; gap: 0.75rem; }
  .header-link { display: none; }
}