/* ============================================================
   CSS Variables
   ============================================================ */
:root {
  --bg: #0f1117;
  --surface: #1a1d27;
  --border: #2a2d3a;
  --text: #e0e0e0;
  --text-dim: #888;
  --accent: #00d4ff;
  --green: #2ecc71;
  --red: #e74c3c;
  --gold: #ffd700;
  --silver: #c0c0c0;
}

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

/* ============================================================
   Base
   ============================================================ */
body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  font-size: 14px;
  line-height: 1.5;
  min-height: 100vh;
}

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

/* ============================================================
   Header
   ============================================================ */
header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
  height: 56px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
}

header h1 {
  font-size: 20px;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 2px;
  text-transform: uppercase;
}

/* ============================================================
   Tabs / Nav
   ============================================================ */
nav {
  display: flex;
  gap: 4px;
}

.tab-btn {
  background: none;
  border: none;
  color: var(--text-dim);
  cursor: pointer;
  font-size: 13px;
  padding: 8px 16px;
  border-radius: 4px;
  transition: color 0.2s, background 0.2s;
}

.tab-btn:hover {
  color: var(--text);
  background: rgba(255, 255, 255, 0.05);
}

.tab-btn.active {
  color: var(--accent);
  background: rgba(0, 212, 255, 0.1);
}

/* ============================================================
   Main / Tab Content
   ============================================================ */
main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 24px 24px 48px;
}

.tab-content {
  display: none;
}

.tab-content.active {
  display: block;
}

/* ============================================================
   Panel
   ============================================================ */
.panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 20px;
  margin-bottom: 20px;
}

.panel h2 {
  font-size: 15px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border);
}

.panel h3 {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-dim);
  margin: 20px 0 12px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.hidden {
  display: none !important;
}

/* ============================================================
   Price Cards
   ============================================================ */
.price-cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 16px;
  margin-bottom: 20px;
}

.price-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 16px;
  cursor: pointer;
  transition: border-color 0.2s, box-shadow 0.2s;
}

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

.price-card.selected {
  border-color: var(--accent);
  box-shadow: 0 0 0 1px var(--accent);
}

.price-card .metal-name {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 6px;
}

.price-card .metal-price {
  font-size: 20px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 4px;
}

.price-card .metal-change {
  font-size: 13px;
  font-weight: 600;
}

.price-card .metal-change.positive {
  color: var(--green);
}

.price-card .metal-change.negative {
  color: var(--red);
}

/* ============================================================
   Chart Controls
   ============================================================ */
.chart-controls {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 12px;
}

.period-buttons {
  display: flex;
  gap: 4px;
}

.period-btn {
  background: none;
  border: 1px solid var(--border);
  color: var(--text-dim);
  cursor: pointer;
  font-size: 12px;
  padding: 4px 10px;
  border-radius: 4px;
  transition: all 0.2s;
}

.period-btn:hover {
  border-color: var(--accent);
  color: var(--text);
}

.period-btn.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #000;
  font-weight: 600;
}

/* ============================================================
   Chart Container
   ============================================================ */
.chart-container {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 16px;
  margin-bottom: 20px;
  height: 300px;
  position: relative;
}

.chart-container canvas {
  width: 100% !important;
  height: 100% !important;
}

/* ============================================================
   Dashboard Bottom
   ============================================================ */
.dashboard-bottom {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

/* ============================================================
   Summary Bar
   ============================================================ */
.summary-bar {
  display: flex;
  gap: 24px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 16px 20px;
  margin-bottom: 20px;
}

.summary-item {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.summary-item .label {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-dim);
}

.summary-item .value {
  font-size: 20px;
  font-weight: 700;
  color: var(--text);
}

.summary-item .value.positive { color: var(--green); }
.summary-item .value.negative { color: var(--red); }

/* ============================================================
   Trades Layout
   ============================================================ */
.trades-layout {
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 20px;
  align-items: start;
}

/* ============================================================
   Strategy Layout
   ============================================================ */
.strategy-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  align-items: start;
}

.strategy-header {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 16px 20px;
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 16px;
}

.strategy-header .version-badge {
  background: rgba(0, 212, 255, 0.1);
  color: var(--accent);
  padding: 4px 10px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 600;
}

/* ============================================================
   Backtest Config
   ============================================================ */
.backtest-config {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr 1fr auto;
  gap: 16px;
  align-items: end;
}

/* ============================================================
   Forms
   ============================================================ */
.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 14px;
}

.form-group label {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

input[type="text"],
input[type="number"],
input[type="date"],
select,
textarea {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text);
  font-size: 14px;
  padding: 8px 10px;
  width: 100%;
  transition: border-color 0.2s;
  appearance: none;
  -webkit-appearance: none;
}

input[type="text"]:focus,
input[type="number"]:focus,
input[type="date"]:focus,
select:focus,
textarea:focus {
  border-color: var(--accent);
  outline: none;
}

textarea {
  resize: vertical;
}

fieldset {
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 14px;
  margin-bottom: 14px;
}

fieldset legend {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-dim);
  padding: 0 6px;
}

.filter-bar {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
}

.filter-bar label {
  font-size: 12px;
  color: var(--text-dim);
  white-space: nowrap;
}

.filter-bar select {
  width: auto;
}

/* ============================================================
   Buttons
   ============================================================ */
.btn-primary {
  background: var(--accent);
  border: none;
  border-radius: 4px;
  color: #000;
  cursor: pointer;
  font-size: 13px;
  font-weight: 700;
  padding: 10px 18px;
  transition: opacity 0.2s;
  width: 100%;
}

.btn-primary:hover {
  opacity: 0.85;
}

/* Toggle Buttons */
.toggle-buttons {
  display: flex;
  gap: 4px;
}

.toggle-btn {
  background: none;
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text-dim);
  cursor: pointer;
  font-size: 13px;
  padding: 6px 14px;
  transition: all 0.2s;
}

.toggle-btn.active {
  border-color: var(--accent);
  color: var(--accent);
  background: rgba(0, 212, 255, 0.1);
}

/* ============================================================
   Tables
   ============================================================ */
.table-wrapper {
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}

thead th {
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  color: var(--text-dim);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.5px;
  padding: 10px 12px;
  text-align: left;
  text-transform: uppercase;
  white-space: nowrap;
}

tbody tr {
  border-bottom: 1px solid var(--border);
  transition: background 0.15s;
}

tbody tr:hover {
  background: rgba(255, 255, 255, 0.03);
}

tbody td {
  color: var(--text);
  padding: 10px 12px;
  vertical-align: top;
}

.badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 3px;
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.3px;
}

.badge-buy {
  background: rgba(46, 204, 113, 0.15);
  color: var(--green);
}

.badge-sell {
  background: rgba(231, 76, 60, 0.15);
  color: var(--red);
}

/* ============================================================
   Tags
   ============================================================ */
.tag-checkboxes {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.tag-label {
  display: flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
  font-size: 13px;
  padding: 4px 10px;
  border-radius: 4px;
  border: 1px solid var(--border);
  transition: all 0.2s;
}

.tag-label:hover {
  border-color: var(--text-dim);
}

.tag-label input[type="checkbox"] {
  width: auto;
  padding: 0;
  margin: 0;
  accent-color: var(--accent);
}

.tag-technical {
  color: var(--accent);
}

.tag-technical:has(input:checked) {
  background: rgba(0, 212, 255, 0.1);
  border-color: var(--accent);
}

.tag-fundamental {
  color: var(--gold);
}

.tag-fundamental:has(input:checked) {
  background: rgba(255, 215, 0, 0.1);
  border-color: var(--gold);
}

/* Tags display */
.tag {
  display: inline-block;
  font-size: 10px;
  font-weight: 600;
  padding: 2px 6px;
  border-radius: 3px;
  text-transform: uppercase;
  letter-spacing: 0.3px;
}

.tag-technical-display {
  background: rgba(0, 212, 255, 0.15);
  color: var(--accent);
  border: 1px solid rgba(0, 212, 255, 0.3);
}

.tag-fundamental-display {
  background: rgba(255, 215, 0, 0.15);
  color: var(--gold);
  border: 1px solid rgba(255, 215, 0, 0.3);
}

/* ============================================================
   Rules
   ============================================================ */
.rule-item {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 14px;
  margin-bottom: 10px;
}

.rule-item.inactive {
  opacity: 0.5;
}

.rule-header {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 8px;
  flex-wrap: wrap;
}

.rule-text {
  font-size: 13px;
  color: var(--text);
  margin-bottom: 6px;
  line-height: 1.5;
}

.rule-params {
  font-size: 11px;
  color: var(--text-dim);
  font-family: monospace;
  margin-bottom: 8px;
}

.rule-toggle {
  background: none;
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text-dim);
  cursor: pointer;
  font-size: 11px;
  padding: 3px 8px;
  margin-left: auto;
  transition: all 0.2s;
}

.rule-toggle:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* ============================================================
   Versions
   ============================================================ */
.version-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: 6px;
  margin-bottom: 8px;
  cursor: pointer;
  transition: border-color 0.2s;
}

.version-item:hover {
  border-color: var(--accent);
}

.version-item .version-num {
  font-size: 13px;
  font-weight: 700;
  color: var(--accent);
  min-width: 30px;
}

.version-item .version-desc {
  font-size: 13px;
  color: var(--text);
  flex: 1;
}

.version-item .version-date {
  font-size: 11px;
  color: var(--text-dim);
}

/* ============================================================
   Metrics Grid
   ============================================================ */
.metrics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 14px;
  margin-bottom: 20px;
}

.metric-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 14px;
}

.metric-card .metric-label {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-dim);
  margin-bottom: 6px;
}

.metric-card .metric-value {
  font-size: 22px;
  font-weight: 700;
  color: var(--text);
}

.metric-card .metric-value.positive { color: var(--green); }
.metric-card .metric-value.negative { color: var(--red); }

/* ============================================================
   Backtest History
   ============================================================ */
.bt-history-item {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: 6px;
  margin-bottom: 8px;
  cursor: pointer;
  transition: border-color 0.2s;
}

.bt-history-item:hover {
  border-color: var(--accent);
}

.bt-history-item .bt-version {
  font-size: 12px;
  color: var(--accent);
  min-width: 60px;
}

.bt-history-item .bt-metal {
  font-size: 13px;
  font-weight: 600;
  color: var(--text);
}

.bt-history-item .bt-dates {
  font-size: 11px;
  color: var(--text-dim);
  flex: 1;
}

.bt-history-item .bt-return {
  font-size: 14px;
  font-weight: 700;
}

/* ============================================================
   Empty / Loading States
   ============================================================ */
.empty-state {
  color: var(--text-dim);
  font-size: 13px;
  padding: 20px 0;
  text-align: center;
}

/* ============================================================
   Strategy Cards (multi-strategy)
   ============================================================ */
.strategy-top-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}

.btn-secondary {
  background: none;
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text-dim);
  cursor: pointer;
  font-size: 12px;
  padding: 5px 12px;
  transition: all 0.2s;
}

.btn-secondary:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.btn-small {
  background: var(--accent);
  color: var(--bg);
  border: none;
  padding: 6px 14px;
  border-radius: 4px;
  cursor: pointer;
  font-size: 12px;
  font-weight: 600;
  width: auto;
}

.btn-small:hover { opacity: 0.9; }

.strategy-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  margin-bottom: 12px;
  overflow: hidden;
  transition: border-color 0.2s;
}

.strategy-card.active {
  border-left: 3px solid var(--green);
}

.strategy-card.inactive {
  border-left: 3px solid var(--red);
  opacity: 0.8;
}

.strategy-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 20px;
  cursor: pointer;
  user-select: none;
  transition: background 0.15s;
}

.strategy-card-header:hover {
  background: rgba(255,255,255,0.03);
}

.strategy-card-title {
  display: flex;
  align-items: center;
  gap: 10px;
}

.strategy-name {
  font-size: 15px;
  font-weight: 600;
  color: var(--text);
}

.strategy-version-badge {
  font-size: 11px;
  color: var(--text-dim);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 3px;
  padding: 1px 6px;
}

.strategy-card-meta {
  display: flex;
  align-items: center;
  gap: 12px;
}

.expand-icon {
  font-size: 10px;
  color: var(--text-dim);
  min-width: 10px;
  transition: transform 0.2s;
}

.strategy-card-body {
  border-top: 1px solid var(--border);
  padding: 20px;
}

/* ============================================================
   Signal panel
   ============================================================ */
.signals-panel { border-color: var(--accent); }

.signal-card {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px;
    background: var(--bg);
    border-radius: 6px;
    margin-bottom: 8px;
}

.signal-card .signal-action {
    font-weight: 700;
    font-size: 13px;
    padding: 4px 10px;
    border-radius: 4px;
    display: inline-block;
    margin-right: 8px;
}

.signal-card .signal-action.buy {
    background: rgba(46, 204, 113, 0.15);
    color: var(--green);
}

.signal-card .signal-action.sell {
    background: rgba(231, 76, 60, 0.15);
    color: var(--red);
}

.metal-group {
    margin-bottom: 12px;
    border: 1px solid var(--border);
    border-radius: 8px;
    overflow: hidden;
}

.metal-group-header {
    padding: 8px 14px;
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    font-size: 14px;
}

.metal-group-signals {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 1px;
    background: var(--border);
}

.metal-group-signals .signal-card,
.metal-group-signals .signal-card-compact {
    margin: 0;
    border: none;
    border-radius: 0;
}

.signal-card-compact {
    padding: 10px 14px;
    background: var(--bg);
}

.signal-card-top {
    display: flex;
    align-items: center;
    gap: 8px;
}

/* ============================================================
   Portfolio
   ============================================================ */
.portfolio-summary {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 12px;
  margin-bottom: 20px;
}

.portfolio-metric {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 14px;
  text-align: center;
}

.portfolio-metric .label {
  font-size: 11px;
  color: var(--text-dim);
  text-transform: uppercase;
  margin-bottom: 4px;
}

.portfolio-metric .value {
  font-size: 20px;
  font-weight: 700;
}

.portfolio-metric .value.positive { color: var(--green); }
.portfolio-metric .value.negative { color: var(--red); }

.positions-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

.positions-table th {
  text-align: left;
  color: var(--text-dim);
  font-weight: 500;
  padding: 8px;
  border-bottom: 1px solid var(--border);
  font-size: 12px;
}

.positions-table td {
  padding: 10px 8px;
  border-bottom: 1px solid var(--border);
}

.positions-table td.positive { color: var(--green); }
.positions-table td.negative { color: var(--red); }

/* ============================================================
   Responsive
   ============================================================ */
@media (max-width: 768px) {
  header {
    padding: 0 16px;
  }

  main {
    padding: 16px;
  }

  .trades-layout,
  .strategy-layout,
  .dashboard-bottom {
    grid-template-columns: 1fr;
  }

  .backtest-config {
    grid-template-columns: 1fr 1fr;
  }

  .price-cards {
    grid-template-columns: repeat(2, 1fr);
  }

  .summary-bar {
    flex-wrap: wrap;
    gap: 14px;
  }

  nav {
    gap: 2px;
  }

  .tab-btn {
    padding: 6px 10px;
    font-size: 12px;
  }
}