/* NETA BI Design System */
:root {
  --brand-purple: #667eea;
  --brand-violet: #764ba2;
  --brand-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --bg-primary: #f5f7fa;
  --bg-card: rgba(255,255,255,0.95);
  --text-primary: #1a1a2e;
  --text-secondary: #666;
  --text-muted: #999;
  --border-light: #e8ecf1;
  --shadow-sm: 0 2px 12px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 20px rgba(0,0,0,0.1);
  --shadow-lg: 0 8px 32px rgba(0,0,0,0.12);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --success: #10b981;
  --warning: #f59e0b;
  --danger: #ef4444;
  --info: #3b82f6;
  --font-stack: -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",sans-serif;
  --font-mono: "SF Mono","Fira Code",monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg-primary: #0f1117;
    --bg-card: rgba(30,32,44,0.95);
    --text-primary: #e2e8f0;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --border-light: #2d3748;
    --shadow-sm: 0 2px 12px rgba(0,0,0,0.2);
    --shadow-md: 0 4px 20px rgba(0,0,0,0.3);
    --shadow-lg: 0 8px 32px rgba(0,0,0,0.4);
  }
}

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

body {
  font-family: var(--font-stack);
  background: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  line-height: 1.6;
}

/* ── Navigation ─────────────────────────────────────── */
.neta-nav {
  background: var(--brand-gradient);
  padding: 0 1.5rem;
  display: flex;
  align-items: center;
  height: 56px;
  box-shadow: var(--shadow-md);
  position: sticky;
  top: 0;
  z-index: 100;
}

.neta-nav__brand {
  font-size: 1.1rem;
  font-weight: 700;
  color: #fff;
  text-decoration: none;
  margin-right: 2rem;
  letter-spacing: -0.02em;
}

.neta-nav__links {
  display: flex;
  gap: 0.25rem;
  list-style: none;
  flex: 1;
}

.neta-nav__links a {
  color: rgba(255,255,255,0.8);
  text-decoration: none;
  font-size: 0.85rem;
  padding: 0.4rem 0.75rem;
  border-radius: 6px;
  transition: all 0.15s;
}

.neta-nav__links a:hover,
.neta-nav__links a.active {
  background: rgba(255,255,255,0.18);
  color: #fff;
}

.neta-nav__status {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.75rem;
  color: rgba(255,255,255,0.7);
}

.neta-nav__dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--success);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%,100% { opacity:1; }
  50% { opacity:0.4; }
}

@media (max-width: 768px) {
  .neta-nav { flex-wrap: wrap; height: auto; padding: 0.5rem 1rem; }
  .neta-nav__links { order: 3; width: 100%; overflow-x: auto; padding: 0.25rem 0; }
  .neta-nav__status { margin-left: auto; }
}

/* ── Layout ─────────────────────────────────────────── */
.neta-container {
  max-width: 1600px;
  margin: 0 auto;
  padding: 1.5rem;
}

/* ── Cards ──────────────────────────────────────────── */
.neta-card {
  background: var(--bg-card);
  backdrop-filter: blur(10px);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-light);
  transition: transform 0.2s, box-shadow 0.2s;
}

.neta-card:hover {
  box-shadow: var(--shadow-md);
}

.neta-card--stat {
  text-align: left;
}

.neta-card--stat:hover {
  transform: translateY(-2px);
}

/* ── Stat Cards ─────────────────────────────────────── */
.neta-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.stat-label {
  color: var(--text-secondary);
  font-size: 0.8rem;
  margin-bottom: 0.4rem;
  font-weight: 500;
}

.stat-value {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.2;
}

.stat-change {
  font-size: 0.78rem;
  padding: 0.15rem 0.45rem;
  border-radius: 4px;
  display: inline-block;
  margin-top: 0.3rem;
  font-weight: 600;
}

.stat-change.up { background: #d1fae5; color: #065f46; }
.stat-change.down { background: #fee2e2; color: #991b1b; }
.stat-change.neutral { background: #f3f4f6; color: #6b7280; }

/* ── Chart Grid ─────────────────────────────────────── */
.neta-chart-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
  margin-bottom: 1.5rem;
}

.neta-chart-grid .full-width { grid-column: 1 / -1; }

@media (max-width: 1200px) {
  .neta-chart-grid { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
  .neta-stats { grid-template-columns: repeat(2, 1fr); }
  .neta-container { padding: 0.75rem; }
}

.chart-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 1rem;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.chart-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
}

.chart-subtitle {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-top: 0.15rem;
}

.chart-container { height: 320px; }
.chart-container.large { height: 400px; }

/* ── Buttons ────────────────────────────────────────── */
.neta-btn {
  padding: 0.4rem 0.8rem;
  border: 1px solid var(--border-light);
  background: var(--bg-card);
  color: var(--text-secondary);
  border-radius: 6px;
  font-size: 0.8rem;
  cursor: pointer;
  transition: all 0.15s;
  font-family: inherit;
}

.neta-btn:hover { background: var(--brand-purple); color: #fff; border-color: var(--brand-purple); }
.neta-btn.active { background: var(--brand-purple); color: #fff; border-color: var(--brand-purple); }

.neta-btn--export {
  background: transparent;
  border: 1px dashed var(--border-light);
  font-size: 0.75rem;
}

.neta-btn--export:hover {
  border-style: solid;
  background: var(--brand-purple);
  color: #fff;
  border-color: var(--brand-purple);
}

.btn-group { display: flex; gap: 0.35rem; flex-wrap: wrap; }

/* ── Alerts ─────────────────────────────────────────── */
.neta-alert {
  padding: 0.75rem 1rem;
  border-radius: var(--radius-sm);
  margin-bottom: 0.5rem;
  border-left: 4px solid;
  font-size: 0.88rem;
}

.neta-alert--critical { border-color: var(--danger); background: #fef2f2; color: #991b1b; }
.neta-alert--warning { border-color: var(--warning); background: #fffbeb; color: #92400e; }
.neta-alert--info { border-color: var(--info); background: #eff6ff; color: #1e40af; }

/* ── Loading ────────────────────────────────────────── */
.neta-loading {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 60vh;
  flex-direction: column;
  gap: 1rem;
  color: var(--text-muted);
}

.neta-spinner {
  width: 36px;
  height: 36px;
  border: 3px solid var(--border-light);
  border-top-color: var(--brand-purple);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

/* ── Timestamp ──────────────────────────────────────── */
.neta-timestamp {
  text-align: center;
  color: var(--text-muted);
  font-size: 0.78rem;
  padding: 1rem;
}

/* ── Toast ──────────────────────────────────────────── */
.neta-toast {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  background: var(--text-primary);
  color: #fff;
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  box-shadow: var(--shadow-lg);
  opacity: 0;
  transform: translateY(10px);
  transition: all 0.3s;
  z-index: 1000;
}

.neta-toast.show { opacity: 1; transform: translateY(0); }