:root {
  --bg-main: #0b0e14;
  --bg-card: #131822;
  --bg-card-alt: #19202e;
  --border-color: #242d3f;
  --text-main: #e6edf3;
  --text-muted: #8b949e;
  --accent-blue: #388bfd;
  --buy-green: #2ea043;
  --buy-green-bright: #3fb950;
  --buy-green-bg: rgba(46, 160, 67, 0.14);
  --sell-red: #f85149;
  --sell-red-bg: rgba(248, 81, 73, 0.14);
  --warn-gold: #d29922;
  --warn-gold-bg: rgba(210, 153, 34, 0.15);
}

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

body {
  background-color: var(--bg-main);
  color: var(--text-main);
  font-family: -apple-system, BlinkMacSystemFont, "Pretendard", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  font-size: 14px;
  line-height: 1.45;
  padding: 16px;
}

.app-container {
  max-width: 1600px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

/* Header & Controls */
.top-header {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 16px 20px;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand h1 {
  font-size: 18px;
  font-weight: 800;
  letter-spacing: 0.5px;
  color: #fff;
}

.subtitle {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 2px;
}

.pulse-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background-color: var(--warn-gold);
  box-shadow: 0 0 8px var(--warn-gold);
}

.pulse-dot.connected {
  background-color: var(--buy-green-bright);
  box-shadow: 0 0 10px var(--buy-green-bright);
}

.controls-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  gap: 14px;
}

.control-group {
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.control-group label {
  font-size: 11px;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
}

.input-combo {
  display: flex;
  gap: 6px;
}

select,
input[type="text"],
input[type="number"] {
  background: var(--bg-main);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  border-radius: 6px;
  padding: 8px 10px;
  font-size: 13px;
  font-weight: 600;
  outline: none;
}

select:focus,
input:focus {
  border-color: var(--accent-blue);
}

.number-input-wrap {
  display: flex;
  align-items: center;
  background: var(--bg-main);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding-right: 8px;
}

.number-input-wrap input {
  border: none;
  width: 72px;
  text-align: right;
  padding-right: 4px;
}

.number-input-wrap .unit {
  font-size: 12px;
  color: var(--text-muted);
}

.hidden {
  display: none !important;
}

.control-actions {
  display: flex;
  gap: 8px;
}

.btn {
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 8px 14px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s ease;
  color: var(--text-main);
  background: var(--bg-card-alt);
}

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

.btn-primary {
  background: var(--accent-blue);
  border-color: var(--accent-blue);
  color: #fff;
}

.btn-primary:hover {
  background: #2f7ae5;
}

.btn-secondary.active {
  background: var(--warn-gold-bg);
  border-color: var(--warn-gold);
  color: #ffd369;
}

.btn-small {
  padding: 4px 10px;
  font-size: 11px;
}

/* Signal Banner */
.signal-banner {
  background: var(--bg-card);
  border: 2px solid var(--border-color);
  border-radius: 12px;
  padding: 18px 22px;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
  transition: all 0.2s ease;
}

.signal-banner.opportunity-active {
  background: linear-gradient(135deg, rgba(46, 160, 67, 0.22) 0%, rgba(19, 24, 34, 0.96) 65%);
  border-color: var(--buy-green-bright);
  box-shadow: 0 0 24px rgba(63, 185, 80, 0.25);
}

.signal-banner.positive-spread {
  border-color: var(--warn-gold);
}

.signal-left {
  display: flex;
  flex-direction: column;
  gap: 6px;
  flex: 1;
  min-width: 300px;
}

.signal-badge {
  display: inline-flex;
  align-self: flex-start;
  padding: 4px 10px;
  border-radius: 99px;
  font-size: 11px;
  font-weight: 700;
  background: var(--bg-card-alt);
  color: var(--text-muted);
  border: 1px solid var(--border-color);
}

.signal-banner.opportunity-active .signal-badge {
  background: var(--buy-green);
  color: #fff;
  border-color: var(--buy-green-bright);
}

.signal-Headline {
  font-size: 20px;
  font-weight: 800;
  color: #fff;
}

.signal-subtext {
  font-size: 13px;
  color: var(--text-muted);
}

.signal-metrics {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.metric-box {
  background: rgba(11, 14, 20, 0.65);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 10px 16px;
  min-width: 175px;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.metric-label {
  font-size: 11px;
  color: var(--text-muted);
}

.metric-value {
  font-size: 20px;
  font-weight: 800;
  font-variant-numeric: tabular-nums;
}

.metric-sub {
  font-size: 11px;
  color: var(--text-muted);
  font-variant-numeric: tabular-nums;
}

/* 4 Exchanges Grid */
.exchanges-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
}

@media (max-width: 1280px) {
  .exchanges-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 700px) {
  .exchanges-grid {
    grid-template-columns: 1fr;
  }
}

.exchange-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 14px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.exchange-card.best-buy-card {
  border-color: var(--buy-green-bright);
  box-shadow: 0 0 12px rgba(63, 185, 80, 0.18);
}

.exchange-card.best-sell-card {
  border-color: var(--accent-blue);
  box-shadow: 0 0 12px rgba(56, 139, 253, 0.18);
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 10px;
}

.ex-title {
  display: flex;
  align-items: center;
  gap: 8px;
}

.ex-title h2 {
  font-size: 15px;
  font-weight: 700;
}

.ex-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--text-muted);
}

.ex-dot.online {
  background: var(--buy-green-bright);
  box-shadow: 0 0 6px var(--buy-green-bright);
}

.ex-dot.error {
  background: var(--sell-red);
}

.pair-tag {
  font-size: 11px;
  padding: 2px 6px;
  border-radius: 4px;
  background: var(--bg-card-alt);
  color: var(--text-muted);
  font-family: monospace;
}

.latency-tag {
  font-size: 11px;
  color: var(--text-muted);
}

.bbo-summary {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

.bbo-item {
  border-radius: 8px;
  padding: 10px;
  display: flex;
  flex-direction: column;
  gap: 3px;
  border: 1px solid transparent;
}

.bbo-item.ask-side {
  background: rgba(248, 81, 73, 0.08);
  border-color: rgba(248, 81, 73, 0.25);
}

.bbo-item.bid-side {
  background: rgba(46, 160, 67, 0.08);
  border-color: rgba(46, 160, 67, 0.25);
}

.bbo-item.highlight-action {
  border-width: 2px;
  border-color: #ffd369;
  box-shadow: 0 0 10px rgba(255, 211, 105, 0.25);
}

.bbo-label {
  font-size: 10px;
  color: var(--text-muted);
}

.bbo-price {
  font-size: 17px;
  font-weight: 800;
  font-variant-numeric: tabular-nums;
}

.ask-side .bbo-price {
  color: #ff7b72;
}

.bid-side .bbo-price {
  color: #56d364;
}

.bbo-qty {
  font-size: 11px;
  color: var(--text-muted);
  font-variant-numeric: tabular-nums;
}

/* Mini Orderbook */
.mini-orderbook {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  background: var(--bg-main);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 8px;
  font-size: 11px;
  font-variant-numeric: tabular-nums;
}

.ob-col-header {
  font-size: 10px;
  color: var(--text-muted);
  margin-bottom: 4px;
  padding-bottom: 3px;
  border-bottom: 1px solid var(--border-color);
}

.ob-rows {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-height: 90px;
}

.ob-row {
  display: flex;
  justify-content: space-between;
  padding: 2px 4px;
  border-radius: 3px;
}

.ob-row.swept-ask {
  background: rgba(248, 81, 73, 0.22);
  outline: 1px solid rgba(255, 123, 114, 0.55);
  font-weight: 700;
}

.ob-row.swept-bid {
  background: rgba(46, 160, 67, 0.22);
  outline: 1px solid rgba(86, 211, 100, 0.55);
  font-weight: 700;
}

.ob-row.ask-row .ob-p {
  color: #ff7b72;
}

.ob-row.bid-row .ob-p {
  color: #56d364;
}

.ob-row .ob-q {
  color: var(--text-muted);
}

/* Bottom Panels */
.bottom-panels {
  display: grid;
  grid-template-columns: 1.15fr 1fr;
  gap: 16px;
}

@media (max-width: 1100px) {
  .bottom-panels {
    grid-template-columns: 1fr;
  }
}

.panel {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.panel-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 8px;
}

.panel-header h3 {
  font-size: 14px;
  font-weight: 700;
}

.panel-hint {
  font-size: 11px;
  color: var(--text-muted);
}

.table-wrap,
.log-table-wrap {
  overflow-x: auto;
}

.log-table-wrap {
  max-height: 270px;
  overflow-y: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-variant-numeric: tabular-nums;
}

th,
td {
  border: 1px solid var(--border-color);
  padding: 8px 10px;
  text-align: center;
  font-size: 12px;
}

th {
  background: var(--bg-card-alt);
  color: var(--text-muted);
  font-weight: 600;
}

.matrix-cell-self {
  background: rgba(255, 255, 255, 0.02);
  color: #484f58;
}

.matrix-cell-neg {
  color: var(--text-muted);
}

.matrix-cell-pos {
  background: var(--warn-gold-bg);
  color: #ffd369;
  font-weight: 700;
}

.matrix-cell-hit {
  background: var(--buy-green-bg);
  color: #56d364;
  font-weight: 800;
  border: 1px solid var(--buy-green-bright);
}

.log-table td {
  font-size: 12px;
}

.log-badge-buy {
  color: #ff7b72;
  font-weight: 700;
}

.log-badge-sell {
  color: #56d364;
  font-weight: 700;
}

.log-spread-hit {
  color: #56d364;
  font-weight: 800;
}

.empty-row td {
  color: var(--text-muted);
  padding: 24px;
}