:root {
  --bg: #0f172a;
  --card-bg: #1e293b;
  --primary: #3b82f6;
  --accent: #10b981;
  --text: #f1f5f9;
  --text-muted: #94a3b8;
  --border: #334155;
}

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

body {
  font-family: system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem;
}

header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 2rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border);
}

h1 {
  font-size: 1.5rem;
  font-weight: 700;
}

.status-badge {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  background: var(--card-bg);
  border-radius: 9999px;
  font-size: 0.875rem;
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1rem;
  margin-bottom: 2rem;
}

.card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 0.75rem;
  padding: 1.25rem;
  transition: border-color 0.2s;
}

.card:hover {
  border-color: var(--primary);
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
}

.asset-name {
  font-size: 1.125rem;
  font-weight: 600;
}

.asset-price {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 0.5rem;
}

.range-info {
  font-size: 0.875rem;
  color: var(--text-muted);
}

.state-indicator {
  padding: 0.25rem 0.75rem;
  border-radius: 9999px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
}

.state-outside { background: #374151; color: #9ca3af; }
.state-inside { background: #065f46; color: #34d399; }

.add-form {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 0.75rem;
  padding: 1.5rem;
  margin-bottom: 2rem;
}

.form-title {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 1rem;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr auto;
  gap: 1rem;
  align-items: end;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

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

input, select {
  padding: 0.625rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  color: var(--text);
  font-size: 1rem;
}

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

button {
  padding: 0.625rem 1.25rem;
  background: var(--primary);
  color: white;
  border: none;
  border-radius: 0.5rem;
  font-weight: 600;
  cursor: pointer;
  transition: opacity 0.2s;
}

button:hover {
  opacity: 0.9;
}

button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

button.remove {
  background: #dc2626;
  padding: 0.5rem;
  font-size: 0.875rem;
}

.alerts-section {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 0.75rem;
  padding: 1.5rem;
}

.section-title {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 1rem;
}

.alert-item {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1rem;
  background: var(--bg);
  border-radius: 0.5rem;
  margin-bottom: 0.5rem;
}

.alert-icon {
  font-size: 1.5rem;
}

.alert-details {
  flex: 1;
}

.alert-title {
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.alert-meta {
  font-size: 0.875rem;
  color: var(--text-muted);
}

.empty-state {
  text-align: center;
  padding: 2rem;
  color: var(--text-muted);
}

@media (max-width: 768px) {
  .container { padding: 1rem; }
  .form-row { grid-template-columns: 1fr; }
}

/* ── Form feedback ───────────────────────────────────────────────────────── */
.form-error {
  margin-top: 0.75rem;
  padding: 0.625rem 0.875rem;
  background: #451a1a;
  border: 1px solid #dc2626;
  border-radius: 0.5rem;
  color: #fca5a5;
  font-size: 0.875rem;
}

.form-success {
  margin-top: 0.75rem;
  padding: 0.625rem 0.875rem;
  background: #052e16;
  border: 1px solid #16a34a;
  border-radius: 0.5rem;
  color: #86efac;
  font-size: 0.875rem;
}

/* ── In-range card highlight ─────────────────────────────────────────────── */
.card-in-range {
  border-color: #10b981;
  box-shadow: 0 0 0 1px #10b98140;
}