:root {
  --bg: #f4f6f9;
  --panel-bg: #ffffff;
  --border: #e2e8f0;
  --text: #1e293b;
  --text-muted: #64748b;
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --danger: #dc2626;
  --danger-hover: #b91c1c;
  --secondary: #475569;
  --secondary-hover: #334155;
  --success: #16a34a;
  --warning: #d97706;
  --idle: #94a3b8;
  --radius: 8px;
  --shadow: 0 1px 3px rgba(15, 23, 42, 0.08);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
}

.hidden {
  display: none !important;
}

/* -- header -------------------------------------------------------- */

.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.5rem;
  background: var(--panel-bg);
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow);
}

.app-header h1 {
  margin: 0;
  font-size: 1.25rem;
  font-weight: 600;
}

.status-pill {
  padding: 0.35rem 0.9rem;
  border-radius: 999px;
  font-size: 0.8rem;
  font-weight: 600;
  color: #fff;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.status-idle { background: var(--idle); }
.status-running { background: var(--success); }
.status-stopped { background: var(--warning); }
.status-completed { background: var(--primary); }
.status-error { background: var(--danger); }

/* -- layout ---------------------------------------------------------- */

main {
  max-width: 1100px;
  margin: 0 auto;
  padding: 1.5rem;
  display: grid;
  gap: 1.25rem;
}

.panel {
  background: var(--panel-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.25rem 1.5rem;
}

.panel h2 {
  margin: 0 0 1rem;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
}

/* -- forms ------------------------------------------------------------ */

.form-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
}

label {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-muted);
}

.hint {
  font-weight: 400;
  font-size: 0.75rem;
  color: var(--text-muted);
}

select,
input[type="text"],
input[type="date"],
input[type="number"],
textarea {
  font-family: inherit;
  font-size: 0.9rem;
  padding: 0.5rem 0.6rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: #fff;
  color: var(--text);
}

select:focus,
input:focus,
textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}

textarea {
  width: 100%;
  resize: vertical;
  font-family: ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;
  font-size: 0.8rem;
  margin-top: 0.5rem;
}

details {
  margin-top: 1rem;
}

details summary {
  cursor: pointer;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-muted);
}

/* -- buttons ------------------------------------------------------- */

.button-row {
  display: flex;
  gap: 0.75rem;
  margin-top: 1.25rem;
}

.btn {
  font-family: inherit;
  font-size: 0.9rem;
  font-weight: 600;
  padding: 0.55rem 1.1rem;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  transition: background-color 0.15s ease;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-primary {
  background: var(--primary);
  color: #fff;
}
.btn-primary:hover:not(:disabled) {
  background: var(--primary-hover);
}

.btn-danger {
  background: var(--danger);
  color: #fff;
}
.btn-danger:hover:not(:disabled) {
  background: var(--danger-hover);
}

.btn-secondary {
  background: var(--secondary);
  color: #fff;
}
.btn-secondary:hover:not(:disabled) {
  background: var(--secondary-hover);
}

.message {
  min-height: 1.2em;
  margin: 0.75rem 0 0;
  font-size: 0.85rem;
}

.message.error { color: var(--danger); }
.message.success { color: var(--success); }

/* -- status grid ----------------------------------------------------- */

.status-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 0.9rem;
}

.status-grid > div {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.status-grid .label {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.status-grid .value {
  font-size: 0.95rem;
  font-weight: 600;
}

.progress-bar {
  margin-top: 1rem;
  height: 8px;
  border-radius: 999px;
  background: var(--border);
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: var(--primary);
  transition: width 0.3s ease;
}

/* -- tables ------------------------------------------------------ */

.filter-row {
  display: flex;
  align-items: flex-end;
  gap: 1rem;
  margin-bottom: 1rem;
  flex-wrap: wrap;
}

.filter-row label {
  min-width: 150px;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
}

th, td {
  text-align: left;
  padding: 0.55rem 0.6rem;
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}

th {
  color: var(--text-muted);
  font-weight: 600;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

tbody tr:hover {
  background: var(--bg);
}

.empty-row td {
  color: var(--text-muted);
  text-align: center;
  font-style: italic;
}

.pnl-positive { color: var(--success); font-weight: 600; }
.pnl-negative { color: var(--danger); font-weight: 600; }

/* -- performance chart ------------------------------------------------ */

#performance canvas {
  max-width: 100%;
}

/* -- responsive ----------------------------------------------------- */

@media (max-width: 640px) {
  .app-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
  }

  main {
    padding: 1rem;
  }

  table {
    display: block;
    overflow-x: auto;
  }
}