:root {
  --bg-base: #090d16;
  --bg-card: #131b2e;
  --bg-card-hover: #19243d;
  --border-color: #232f48;
  --text-main: #f1f5f9;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  --accent-blue: #38bdf8;
  --accent-green: #22c55e;
  --accent-yellow: #eab308;
  --accent-red: #ef4444;
  --accent-purple: #a855f7;
}

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

body {
  margin: 0;
  padding: 0;
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background-color: var(--bg-base);
  color: var(--text-main);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

.app-container {
  max-width: 1380px;
  margin: 0 auto;
  padding: 24px 20px 48px;
}

/* Top Navigation Bar */
.top-navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 14px;
  padding: 16px 24px;
  margin-bottom: 24px;
  flex-wrap: wrap;
  gap: 16px;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.nav-brand h1 {
  font-size: 20px;
  font-weight: 700;
  margin: 0;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-brand a {
  text-decoration: none;
  color: inherit;
  display: flex;
  align-items: center;
  gap: 8px;
}

.host-badge {
  background: rgba(56, 189, 248, 0.15);
  color: var(--accent-blue);
  font-size: 12px;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 6px;
  border: 1px solid rgba(56, 189, 248, 0.3);
}

.perf-badge {
  background: rgba(148, 163, 184, 0.08);
  color: var(--text-dim);
  font-size: 11px;
  font-weight: 500;
  padding: 3px 8px;
  border-radius: 6px;
  border: 1px solid rgba(148, 163, 184, 0.15);
  white-space: nowrap;
}

.filter-controls {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.btn {
  padding: 8px 16px;
  font-size: 13px;
  font-weight: 600;
  border-radius: 8px;
  cursor: pointer;
  border: none;
  transition: all 0.15s ease;
  white-space: nowrap;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.btn-primary {
  background: #2563eb;
  color: #fff;
}
.btn-primary:hover {
  background: #1d4ed8;
  transform: translateY(-1px);
}

.btn-secondary {
  background: #1e293b;
  color: var(--text-main);
  border: 1px solid var(--border-color);
}
.btn-secondary:hover {
  background: #334155;
}

/* Metrics Cards Grid */
.metrics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  gap: 16px;
  margin-bottom: 24px;
}

.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 18px 20px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: transform 0.15s ease, border-color 0.15s ease;
}

.stat-card:hover {
  border-color: #3b82f6;
  transform: translateY(-2px);
}

.stat-card .label {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  font-weight: 600;
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.stat-card .val {
  font-size: 28px;
  font-weight: 700;
  color: var(--text-main);
  line-height: 1.1;
}

.stat-card .sub {
  font-size: 12px;
  color: var(--text-dim);
  margin-top: 6px;
}

.stat-card.c-green .val { color: var(--accent-green); }
.stat-card.c-yellow .val { color: var(--accent-yellow); }
.stat-card.c-red .val { color: var(--accent-red); }
.stat-card.c-blue .val { color: var(--accent-blue); }
.stat-card.c-purple .val { color: var(--accent-purple); }

/* Panels */
.panel {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 20px;
  margin-bottom: 24px;
}

.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 12px;
}

.panel-header h2 {
  font-size: 16px;
  font-weight: 600;
  margin: 0;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 8px;
}

/* Tables */
table.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}

table.data-table th {
  text-align: left;
  padding: 10px 14px;
  background: var(--bg-base);
  color: var(--text-muted);
  text-transform: uppercase;
  font-size: 11px;
  letter-spacing: 0.05em;
  font-weight: 600;
}

table.data-table td {
  padding: 12px 14px;
  border-bottom: 1px solid var(--border-color);
  color: #cbd5e1;
}

table.data-table tr:last-child td {
  border-bottom: none;
}

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

.rate-badge {
  display: inline-block;
  padding: 3px 8px;
  border-radius: 6px;
  font-weight: 600;
  font-size: 12px;
}

.rate-green { background: rgba(34, 197, 94, 0.15); color: #4ade80; }
.rate-yellow { background: rgba(234, 179, 8, 0.15); color: #facc15; }
.rate-red { background: rgba(239, 68, 68, 0.15); color: #f87171; }
.rate-gray { background: rgba(148, 163, 184, 0.15); color: #94a3b8; }

.score-pill {
  display: inline-block;
  padding: 4px 10px;
  border-radius: 6px;
  font-weight: 700;
  font-size: 13px;
}
.score-pill.good { background: rgba(34, 197, 94, 0.15); color: #4ade80; border: 1px solid rgba(34, 197, 94, 0.3); }
.score-pill.warn { background: rgba(234, 179, 8, 0.15); color: #facc15; border: 1px solid rgba(234, 179, 8, 0.3); }
.score-pill.bad { background: rgba(239, 68, 68, 0.15); color: #f87171; border: 1px solid rgba(239, 68, 68, 0.3); }

/* Progress Track */
.progress-track {
  background: #232f48;
  height: 6px;
  border-radius: 3px;
  overflow: hidden;
  width: 90px;
  display: inline-block;
  vertical-align: middle;
  margin-right: 8px;
}
.progress-fill {
  height: 100%;
  background: var(--accent-green);
  transition: width 0.3s ease;
}
.progress-fill.fill-yellow { background: var(--accent-yellow); }
.progress-fill.fill-red { background: var(--accent-red); }

/* Inputs and Snippets */
.input-row {
  display: flex;
  gap: 10px;
  margin-bottom: 12px;
}

.input-box {
  flex: 1;
  background: var(--bg-base);
  border: 1px solid var(--border-color);
  color: var(--accent-blue);
  padding: 10px 14px;
  border-radius: 8px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 13px;
  outline: none;
}
.input-box:focus {
  border-color: #3b82f6;
}

pre, code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
}

.code-container {
  background: var(--bg-base);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 14px;
  overflow-x: auto;
  font-size: 12px;
  line-height: 1.6;
  color: #cbd5e1;
}

textarea.raw-textarea {
  width: 100%;
  height: 130px;
  background: var(--bg-base);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 12px;
  color: var(--text-main);
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 12px;
  outline: none;
  resize: vertical;
  margin-bottom: 12px;
}
textarea.raw-textarea:focus {
  border-color: #3b82f6;
}

/* Two-column grid */
.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-bottom: 24px;
}
@media (max-width: 900px) {
  .grid-2 { grid-template-columns: 1fr; }
}

/* Preview Tabs */
.preview-tabs {
  display: flex;
  gap: 8px;
  margin-bottom: 14px;
}
.tab-link {
  padding: 6px 14px;
  font-size: 13px;
  color: var(--text-muted);
  background: var(--bg-base);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  cursor: pointer;
  font-weight: 500;
  transition: all 0.15s ease;
}
.tab-link:hover { color: var(--text-main); }
.tab-link.active {
  background: #2563eb;
  color: #fff;
  border-color: #2563eb;
  font-weight: 600;
}

.iframe-wrap iframe {
  width: 100%;
  height: 500px;
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: 8px;
}

/* Empty State / Loading State */
.empty-state {
  text-align: center;
  padding: 48px 24px;
  color: var(--text-muted);
}
.empty-state code {
  display: inline-block;
  background: #0f172a;
  padding: 10px 16px;
  border-radius: 8px;
  color: #38bdf8;
  margin-top: 12px;
  border: 1px solid #334155;
}

.loading-spinner {
  width: 38px;
  height: 38px;
  border: 3px solid rgba(56, 189, 248, 0.2);
  border-top-color: var(--accent-blue);
  border-radius: 50%;
  animation: spin 0.9s linear infinite;
  margin: 0 auto 16px;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}