:root {
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-card: #1e293b;
  --border-color: #334155;
  --text-primary: #f8fafc;
  --text-muted: #94a3b8;
  --accent-blue: #3b82f6;
  --accent-green: #10b981;
  --accent-amber: #f59e0b;
  --accent-red: #ef4444;
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

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

body {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-family);
  line-height: 1.5;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a {
  color: var(--accent-blue);
  text-decoration: none;
}
a:hover {
  text-decoration: underline;
}

/* Header & Navigation */
header {
  background-color: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  padding: 0.75rem 1rem;
  position: sticky;
  top: 0;
  z-index: 50;
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.brand {
  font-size: 1.15rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: #fff;
}

.mode-badge {
  font-size: 0.72rem;
  padding: 0.2rem 0.6rem;
  border-radius: 9999px;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  display: inline-flex;
  align-items: center;
}

.mode-badge-paper {
  background-color: #1e3a8a;
  color: #93c5fd;
  border: 1px solid #3b82f6;
}

.mode-badge-live {
  background-color: #7f1d1d;
  color: #fca5a5;
  border: 1px solid #ef4444;
  animation: pulse-red 2s infinite;
}

.nav-links {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  align-items: center;
}

.nav-item {
  color: var(--text-muted);
  padding: 0.35rem 0.65rem;
  border-radius: 6px;
  font-size: 0.875rem;
  font-weight: 500;
  transition: background 0.15s, color 0.15s;
}

.nav-item:hover, .nav-item.active {
  background-color: var(--border-color);
  color: #fff;
  text-decoration: none;
}

/* Main Container */
main {
  flex: 1;
  max-width: 1200px;
  width: 100%;
  margin: 0 auto;
  padding: 1.5rem 1rem;
}

/* Priority Visual Badges Banner */
.status-banner {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 0.75rem;
  margin-bottom: 1.5rem;
}

.status-badge-card {
  padding: 0.75rem 1rem;
  border-radius: 8px;
  text-align: center;
  font-weight: 700;
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  box-shadow: 0 2px 4px rgba(0,0,0,0.2);
}

.status-badge-card .badge-title {
  font-size: 0.7rem;
  color: var(--text-muted);
  font-weight: 600;
}

.badge-paper {
  background-color: #1e3a8a;
  color: #93c5fd;
  border: 1px solid #3b82f6;
}

.badge-live {
  background-color: #7f1d1d;
  color: #fca5a5;
  border: 1px solid #ef4444;
  animation: pulse-red 2s infinite;
}

@keyframes pulse-red {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.75; }
}

.badge-running {
  background-color: #064e3b;
  color: #6ee7b7;
  border: 1px solid #10b981;
}

.badge-stopped {
  background-color: #7f1d1d;
  color: #fca5a5;
  border: 1px solid #ef4444;
}

.badge-active {
  background-color: #064e3b;
  color: #6ee7b7;
  border: 1px solid #10b981;
}

.badge-paused {
  background-color: #78350f;
  color: #fcd34d;
  border: 1px solid #f59e0b;
}

.badge-connected {
  background-color: #064e3b;
  color: #6ee7b7;
  border: 1px solid #10b981;
}

.badge-disconnected {
  background-color: #7f1d1d;
  color: #fca5a5;
  border: 1px solid #ef4444;
}

/* Cards & Layout */
.card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 1.25rem;
  margin-bottom: 1.25rem;
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 0.5rem;
}

.card-title {
  font-size: 1.1rem;
  font-weight: 600;
}

/* Metrics Grid */
.metrics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
}

.metric-box {
  background-color: rgba(255,255,255,0.03);
  padding: 0.75rem 1rem;
  border-radius: 6px;
  border: 1px solid rgba(255,255,255,0.05);
}

.metric-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
}

.metric-value {
  font-size: 1.25rem;
  font-weight: 700;
  margin-top: 0.25rem;
}

.positive { color: var(--accent-green); }
.negative { color: var(--accent-red); }
.neutral { color: var(--text-primary); }

/* Tables */
.table-responsive {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
  text-align: left;
}

th, td {
  padding: 0.65rem 0.75rem;
  border-bottom: 1px solid var(--border-color);
  white-space: nowrap;
}

th {
  background-color: rgba(255,255,255,0.02);
  color: var(--text-muted);
  font-weight: 600;
}

tr:hover td {
  background-color: rgba(255,255,255,0.02);
}

/* Buttons & Inputs */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  font-size: 0.875rem;
  padding: 0.5rem 1rem;
  border-radius: 6px;
  border: none;
  cursor: pointer;
  transition: opacity 0.15s;
  gap: 0.35rem;
}

.btn:hover { opacity: 0.9; }
.btn-primary { background-color: var(--accent-blue); color: #fff; }
.btn-success { background-color: var(--accent-green); color: #fff; }
.btn-warning { background-color: var(--accent-amber); color: #000; }
.btn-danger { background-color: var(--accent-red); color: #fff; }
.btn-secondary { background-color: var(--border-color); color: #fff; }
.btn-sm { padding: 0.25rem 0.5rem; font-size: 0.75rem; }

input[type="text"],
input[type="password"],
input[type="number"],
select {
  width: 100%;
  padding: 0.5rem 0.75rem;
  background-color: #0f172a;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  color: #fff;
  font-size: 0.875rem;
  margin-top: 0.25rem;
}

input:focus, select:focus {
  outline: none;
  border-color: var(--accent-blue);
}

.form-group {
  margin-bottom: 1rem;
}

.form-label {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-muted);
}

/* Alerts */
.alert {
  padding: 0.75rem 1rem;
  border-radius: 6px;
  margin-bottom: 1rem;
  font-size: 0.875rem;
}

.alert-success { background-color: rgba(16,185,129,0.2); border: 1px solid var(--accent-green); color: #a7f3d0; }
.alert-error { background-color: rgba(239,68,68,0.2); border: 1px solid var(--accent-red); color: #fecaca; }
.alert-warning { background-color: rgba(245,158,11,0.2); border: 1px solid var(--accent-amber); color: #fde68a; }
.alert-info { background-color: rgba(59,130,246,0.2); border: 1px solid var(--accent-blue); color: #bfdbfe; }

/* Modal */
.modal-backdrop {
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background-color: rgba(0,0,0,0.7);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 100;
  padding: 1rem;
}

.modal-backdrop.active {
  display: flex;
}

.modal-content {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  max-width: 480px;
  width: 100%;
  padding: 1.5rem;
  box-shadow: 0 10px 25px rgba(0,0,0,0.5);
}

/* Footer */
footer {
  text-align: center;
  padding: 1rem;
  font-size: 0.75rem;
  color: var(--text-muted);
  border-top: 1px solid var(--border-color);
}