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

:root {
  --bg-primary: #0a0e17;
  --bg-panel: #0d1321;
  --bg-input: #111827;
  --border: #1a2332;
  --text-primary: #e0e0e0;
  --text-secondary: #8892a4;
  --text-muted: #4a5568;
  --accent: #4a9eff;
  --green: #00ff88;
  --red: #ff6b6b;
  --green-dim: rgba(0, 255, 136, 0.15);
  --red-dim: rgba(255, 107, 107, 0.15);
  --font-mono: 'SF Mono', 'Fira Code', 'Cascadia Code', 'Consolas', monospace;
  --font-system: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

body {
  background: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.5;
  min-height: 100vh;
}

/* === Screens (show/hide) === */
.screen { display: none; }
.screen.active { display: flex; }

/* === Login Screen === */
#login-screen {
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  flex-direction: column;
  gap: 24px;
}

.login-box {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 40px;
  width: 360px;
  text-align: center;
}

.login-box h1 {
  font-family: var(--font-system);
  font-size: 20px;
  color: var(--accent);
  margin-bottom: 8px;
}

.login-box .subtitle {
  color: var(--text-muted);
  font-size: 12px;
  margin-bottom: 24px;
}

.login-box input {
  width: 100%;
  padding: 10px 14px;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 14px;
  outline: none;
  margin-bottom: 16px;
}

.login-box input:focus {
  border-color: var(--accent);
}

.login-box button {
  width: 100%;
  padding: 10px;
  background: var(--accent);
  color: var(--bg-primary);
  border: none;
  border-radius: 4px;
  font-family: var(--font-system);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
}

.login-box button:hover {
  opacity: 0.9;
}

/* === Ticker Selection Screen === */
#ticker-screen {
  flex-direction: column;
  min-height: 100vh;
}

.ticker-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 16px;
  padding: 40px;
  max-width: 1000px;
  margin: 0 auto;
  width: 100%;
}

.ticker-card {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 24px;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.2s, transform 0.1s;
}

.ticker-card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}

.ticker-card .symbol {
  font-size: 24px;
  font-weight: bold;
  color: var(--accent);
  margin-bottom: 4px;
}

.ticker-card .label {
  font-size: 11px;
  color: var(--text-muted);
  text-transform: uppercase;
}

/* === Header Bar === */
.header {
  display: flex;
  align-items: center;
  padding: 10px 20px;
  background: var(--bg-panel);
  border-bottom: 1px solid var(--border);
  gap: 16px;
  font-family: var(--font-system);
  font-size: 13px;
}

.header .ticker-name {
  font-size: 18px;
  font-weight: bold;
  color: var(--accent);
  font-family: var(--font-mono);
}

.header .trader-id {
  color: var(--text-secondary);
  margin-left: auto;
}

.header button {
  padding: 4px 12px;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text-secondary);
  font-family: var(--font-system);
  font-size: 12px;
  cursor: pointer;
}

.header button:hover {
  border-color: var(--text-secondary);
  color: var(--text-primary);
}

/* === Trading Screen Layout === */
#trading-screen {
  flex-direction: column;
  height: 100vh;
}

.trading-layout {
  display: flex;
  flex: 1;
  overflow: hidden;
}

.col-left {
  flex: 2;
  display: flex;
  flex-direction: column;
  border-right: 1px solid var(--border);
  overflow: hidden;
}

.col-right {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  min-width: 280px;
}

/* === Panels === */
.panel {
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.panel-header {
  padding: 8px 16px;
  font-family: var(--font-system);
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--accent);
  background: var(--bg-panel);
  border-bottom: 1px solid var(--border);
}

.panel-body {
  flex: 1;
  overflow-y: auto;
  padding: 0;
}

/* === Market Depth === */
#depth-panel {
  flex: 2;
  border-bottom: 1px solid var(--border);
}

#depth-body {
  display: flex;
  flex-direction: column;
}

.depth-asks {
  flex: 1;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
}

.depth-bids {
  flex: 1;
  overflow-y: auto;
}

.depth-table {
  width: 100%;
  border-collapse: collapse;
}

.depth-table td {
  padding: 3px 16px;
  font-size: 12px;
  position: relative;
}

.depth-row {
  position: relative;
}

.depth-row .bar {
  position: absolute;
  top: 0;
  bottom: 0;
  z-index: 0;
}

.depth-row.ask .bar {
  right: 0;
  background: var(--red-dim);
}

.depth-row.bid .bar {
  left: 0;
  background: var(--green-dim);
}

.depth-row td {
  position: relative;
  z-index: 1;
}

.depth-row.ask .price { color: var(--red); }
.depth-row.bid .price { color: var(--green); }
.depth-row .qty { color: var(--text-secondary); text-align: right; }

.depth-spread {
  text-align: center;
  padding: 4px 16px;
  color: var(--text-muted);
  font-size: 11px;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  background: var(--bg-panel);
  flex-shrink: 0;
}

.depth-more {
  text-align: center;
  padding: 3px;
  color: var(--text-muted);
  font-size: 10px;
  font-style: italic;
  letter-spacing: 0.3px;
}

/* === Recent Trades === */
#trades-panel {
  flex: 1;
}

.trade-row {
  display: flex;
  padding: 3px 16px;
  font-size: 12px;
  gap: 12px;
}

.trade-row .time { color: var(--text-muted); width: 90px; }
.trade-row .price { width: 80px; }
.trade-row .qty { color: var(--text-secondary); width: 60px; text-align: right; }
.trade-row .dir { width: 16px; text-align: center; }
.trade-row.up .price { color: var(--green); }
.trade-row.down .price { color: var(--red); }
.trade-row.up .dir { color: var(--green); }
.trade-row.down .dir { color: var(--red); }

/* === Order Entry === */
#order-panel {
  border-bottom: 1px solid var(--border);
}

.order-form {
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.side-toggle {
  display: flex;
  border-radius: 4px;
  overflow: hidden;
  border: 1px solid var(--border);
}

.side-toggle button {
  flex: 1;
  padding: 8px;
  border: none;
  font-family: var(--font-system);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  background: var(--bg-input);
  color: var(--text-muted);
}

.side-toggle button.active-buy {
  background: var(--green);
  color: var(--bg-primary);
}

.side-toggle button.active-sell {
  background: var(--red);
  color: var(--bg-primary);
}

.order-form label {
  font-size: 11px;
  color: var(--text-secondary);
  text-transform: uppercase;
}

.order-form input {
  width: 100%;
  padding: 8px 12px;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 13px;
  outline: none;
}

.order-form input:focus {
  border-color: var(--accent);
}

.submit-btn {
  padding: 10px;
  border: none;
  border-radius: 4px;
  font-family: var(--font-system);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  color: var(--bg-primary);
}

.submit-btn.buy { background: var(--green); }
.submit-btn.sell { background: var(--red); }
.submit-btn:hover { opacity: 0.9; }

.simulate-btn {
  padding: 8px;
  border: 1px solid var(--border);
  border-radius: 4px;
  font-family: var(--font-system);
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  background: var(--bg-input);
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

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

.simulate-btn.active {
  background: var(--accent);
  color: var(--bg-primary);
  border-color: var(--accent);
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.7; }
}

/* === My Orders === */
#my-orders-panel {
  flex: 1;
}

.my-order-row {
  display: flex;
  align-items: center;
  padding: 6px 16px;
  font-size: 12px;
  gap: 8px;
  border-bottom: 1px solid var(--border);
}

.my-order-row .side {
  font-weight: 600;
  width: 36px;
}

.my-order-row .side.buy { color: var(--green); }
.my-order-row .side.sell { color: var(--red); }
.my-order-row .price { width: 70px; }
.my-order-row .qty { color: var(--text-secondary); width: 50px; }

.cancel-btn {
  margin-left: auto;
  padding: 2px 8px;
  background: transparent;
  border: 1px solid var(--red);
  border-radius: 3px;
  color: var(--red);
  font-size: 10px;
  cursor: pointer;
  font-family: var(--font-system);
}

.cancel-btn:hover {
  background: var(--red);
  color: var(--bg-primary);
}

.my-order-row.dimmed {
  opacity: 0.4;
  pointer-events: none;
}

/* === Toast === */
.toast-container {
  position: fixed;
  top: 16px;
  right: 16px;
  z-index: 1000;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.toast {
  padding: 10px 16px;
  border-radius: 4px;
  font-family: var(--font-system);
  font-size: 12px;
  animation: toast-in 0.3s ease, toast-out 0.3s ease 2.7s forwards;
}

.toast.success { background: var(--green); color: var(--bg-primary); }
.toast.error { background: var(--red); color: var(--bg-primary); }

@keyframes toast-in { from { opacity: 0; transform: translateX(20px); } to { opacity: 1; transform: translateX(0); } }
@keyframes toast-out { from { opacity: 1; } to { opacity: 0; } }

/* === Empty State === */
.empty-state {
  text-align: center;
  padding: 24px;
  color: var(--text-muted);
  font-size: 12px;
}

/* === Scrollbar === */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-primary); }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }