:root {
  --bg: #0b0f19;
  --card: #141b2d;
  --card-hover: #1a2236;
  --border: #24304a;
  --text: #e8edf7;
  --muted: #8b95a8;
  --primary: #3b82f6;
  --success: #22c55e;
  --warning: #f59e0b;
  --danger: #ef4444;
  --buy: #22c55e;
  --sell: #ef4444;
  --hold: #64748b;
  --radius: 14px;
  --shadow: 0 8px 32px rgba(0,0,0,.35);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'PingFang SC', sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.5;
}

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

/* Auth */
.auth-body {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  background: radial-gradient(ellipse at top, #1e3a5f 0%, var(--bg) 60%);
  padding: 20px;
}

.auth-card {
  width: 100%;
  max-width: 400px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 36px 28px;
  box-shadow: var(--shadow);
}

.brand { text-align: center; margin-bottom: 28px; }
.brand-icon {
  width: 56px; height: 56px;
  background: linear-gradient(135deg, #3b82f6, #8b5cf6);
  border-radius: 16px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 28px;
  font-weight: 800;
  margin-bottom: 12px;
}
.brand h1 { font-size: 1.5rem; margin-bottom: 4px; }
.brand p { color: var(--muted); font-size: .9rem; }

.auth-form label { display: block; margin-bottom: 6px; font-size: .85rem; color: var(--muted); }
.auth-form input {
  width: 100%;
  padding: 12px 14px;
  margin-bottom: 16px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--text);
  font-size: 1rem;
}
.auth-hint { text-align: center; color: var(--muted); font-size: .75rem; margin-top: 16px; }

/* Layout */
.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 20px;
  background: var(--card);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.logo { font-weight: 800; font-size: 1.2rem; margin-right: 12px; }
.topbar-left, .topbar-right { display: flex; align-items: center; gap: 10px; }
.user { color: var(--muted); font-size: .9rem; }

.container { max-width: 1200px; margin: 0 auto; padding: 16px; }

.grid { display: grid; gap: 14px; }
.stats-grid { grid-template-columns: repeat(4, 1fr); margin-bottom: 14px; }
.symbol-grid { grid-template-columns: repeat(3, 1fr); margin-bottom: 14px; }

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
  box-shadow: var(--shadow);
}

.stat-card .stat-label { color: var(--muted); font-size: .8rem; margin-bottom: 6px; }
.stat-card .stat-value { font-size: 1.4rem; font-weight: 700; }

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

/* Symbol card */
.sym-card { transition: border-color .2s; }
.sym-card:hover { border-color: #3b82f6; }
.sym-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 12px; }
.sym-name { font-size: 1.1rem; font-weight: 700; }
.sym-price { font-size: 1.3rem; font-weight: 700; margin-bottom: 8px; }
.sym-row { display: flex; justify-content: space-between; font-size: .85rem; color: var(--muted); margin-bottom: 4px; }
.sym-row span:last-child { color: var(--text); }

.signal-badge {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 20px;
  font-size: .8rem;
  font-weight: 700;
  text-transform: uppercase;
}
.signal-BUY { background: rgba(34,197,94,.15); color: var(--buy); }
.signal-SELL { background: rgba(239,68,68,.15); color: var(--sell); }
.signal-HOLD { background: rgba(100,116,139,.15); color: var(--hold); }

.strength-strong { color: #fbbf24; }
.strength-medium { color: #60a5fa; }
.strength-weak { color: var(--muted); }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 18px;
  border: none;
  border-radius: 10px;
  font-size: .9rem;
  font-weight: 600;
  cursor: pointer;
  transition: opacity .15s, transform .1s;
}
.btn:active { transform: scale(.97); }
.btn-block { width: 100%; }
.btn-sm { padding: 6px 12px; font-size: .8rem; }
.btn-primary { background: var(--primary); color: #fff; }
.btn-success { background: var(--success); color: #fff; }
.btn-warning { background: var(--warning); color: #000; }
.btn-danger { background: var(--danger); color: #fff; }
.btn-ghost { background: transparent; color: var(--muted); border: 1px solid var(--border); }

.badge {
  padding: 4px 10px;
  border-radius: 20px;
  font-size: .75rem;
  font-weight: 600;
  background: rgba(100,116,139,.2);
  color: var(--muted);
}
.badge.online { background: rgba(34,197,94,.15); color: var(--success); }
.badge.error { background: rgba(239,68,68,.15); color: var(--danger); }

/* Tabs */
.tabs { display: flex; gap: 4px; margin-bottom: 18px; flex-wrap: wrap; }
.tab {
  padding: 8px 16px;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--muted);
  cursor: pointer;
  font-size: .85rem;
}
.tab.active { background: var(--primary); color: #fff; border-color: var(--primary); }
.tab-panel { display: none; }
.tab-panel.active { display: block; }

.form-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
  margin-bottom: 16px;
}
.form-group label { display: block; margin-bottom: 6px; font-size: .8rem; color: var(--muted); }
.form-group input, .form-group select {
  width: 100%;
  padding: 10px 12px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  font-size: .95rem;
}

.log-box {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px;
  max-height: 360px;
  overflow-y: auto;
  font-family: 'Consolas', monospace;
  font-size: .78rem;
}
.log-line { padding: 3px 0; border-bottom: 1px solid rgba(255,255,255,.03); }
.log-ERROR, .log-WARN { color: var(--danger); }
.log-TRADE { color: var(--success); }
.log-INFO { color: var(--muted); }

.alert { padding: 10px 14px; border-radius: 8px; margin-bottom: 14px; font-size: .9rem; }
.alert-error { background: rgba(239,68,68,.15); color: var(--danger); }
.muted { color: var(--muted); font-size: .8rem; }

.pos-long { color: var(--buy); }
.pos-short { color: var(--sell); }
.pos-none { color: var(--muted); }

/* Mobile */
@media (max-width: 768px) {
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .symbol-grid { grid-template-columns: 1fr; }
  .form-grid { grid-template-columns: 1fr; }
  .control-bar { flex-direction: column; align-items: stretch; }
  .control-bar .btn { width: 100%; }
  .stat-value { font-size: 1.1rem; }
}

@media (max-width: 480px) {
  .stats-grid { grid-template-columns: 1fr 1fr; }
  .container { padding: 10px; }
  .topbar { padding: 10px 12px; }
}