/* ============================================================
   V8 Trading Dashboard — v2.css
   ============================================================ */

/* --- CSS Variables --- */
:root {
  /* Color palette */
  --c-bg: #0a0e17;
  --c-surface: #111827;
  --c-surface-hover: #1a2332;
  --c-border: #1e293b;
  --c-border-light: #2d3a4d;
  --c-text: #e2e8f0;
  --c-text-secondary: #94a3b8;
  --c-text-muted: #64748b;
  --c-accent: #10b981;
  --c-accent-hover: #059669;
  --c-loss: #ef4444;
  --c-loss-hover: #dc2626;
  --c-warn: #f59e0b;
  --c-info: #3b82f6;

  /* Fonts */
  --f-display: 'Space Grotesk', sans-serif;
  --f-body: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --f-mono: 'JetBrains Mono', monospace;

  /* Spacing */
  --sp-xs: 4px;
  --sp-sm: 8px;
  --sp-md: 16px;
  --sp-lg: 24px;
  --sp-xl: 32px;
  --sp-2xl: 48px;

  /* Layout */
  --sidebar-width: 240px;
  --sidebar-collapsed: 64px;
  --topbar-height: 52px;

  /* Transitions */
  --t-fast: 150ms ease;
  --t-normal: 250ms ease;
}

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

html {
  font-size: 14px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--f-body);
  background: var(--c-bg);
  color: var(--c-text);
  line-height: 1.5;
  overflow-x: hidden;
}

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

input, select, textarea, button {
  font-family: inherit;
  font-size: inherit;
}

/* --- Layout Shell --- */
.app-shell {
  display: flex;
  min-height: 100vh;
}

.main-wrapper {
  flex: 1;
  margin-left: var(--sidebar-width);
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  transition: margin-left var(--t-normal);
}

.main-wrapper.sidebar-collapsed {
  margin-left: var(--sidebar-collapsed);
}

/* --- Sidebar --- */
.sidebar {
  position: fixed;
  top: 0;
  left: 0;
  width: var(--sidebar-width);
  height: 100vh;
  background: var(--c-surface);
  border-right: 1px solid var(--c-border);
  display: flex;
  flex-direction: column;
  z-index: 100;
  transition: width var(--t-normal);
  overflow: hidden;
}

.sidebar.collapsed {
  width: var(--sidebar-collapsed);
}

.sidebar-brand {
  display: flex;
  align-items: center;
  gap: var(--sp-sm);
  padding: var(--sp-md);
  height: var(--topbar-height);
  border-bottom: 1px solid var(--c-border);
  white-space: nowrap;
  overflow: hidden;
}

.sidebar-brand .brand-icon {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--f-display);
  font-weight: 700;
  font-size: 16px;
  color: var(--c-accent);
  border: 1px solid var(--c-accent);
  flex-shrink: 0;
}

.sidebar-brand .brand-text {
  font-family: var(--f-display);
  font-weight: 600;
  font-size: 16px;
  color: var(--c-text);
}

.sidebar-nav {
  flex: 1;
  padding: var(--sp-sm) 0;
  overflow-y: auto;
}

.sidebar-nav .nav-section {
  padding: var(--sp-xs) var(--sp-md);
  margin-top: var(--sp-sm);
}

.sidebar-nav .nav-section-title {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--c-text-muted);
  margin-bottom: var(--sp-xs);
  white-space: nowrap;
  overflow: hidden;
}

.sidebar-nav .nav-item {
  display: flex;
  align-items: center;
  gap: var(--sp-sm);
  padding: var(--sp-sm) var(--sp-md);
  color: var(--c-text-secondary);
  border-radius: 4px;
  cursor: pointer;
  transition: background var(--t-fast), color var(--t-fast);
  white-space: nowrap;
  overflow: hidden;
  text-decoration: none;
}

.sidebar-nav .nav-item:hover {
  background: var(--c-surface-hover);
  color: var(--c-text);
}

.sidebar-nav .nav-item.active {
  background: rgba(16, 185, 129, 0.1);
  color: var(--c-accent);
}

.sidebar-nav .nav-item .nav-icon {
  width: 20px;
  text-align: center;
  flex-shrink: 0;
  font-size: 16px;
}

.sidebar-nav .nav-item .nav-label {
  font-size: 13px;
}

.sidebar-footer {
  padding: var(--sp-md);
  border-top: 1px solid var(--c-border);
}

.sidebar-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  background: none;
  border: 1px solid var(--c-border);
  border-radius: 4px;
  color: var(--c-text-secondary);
  cursor: pointer;
  transition: background var(--t-fast), color var(--t-fast);
}

.sidebar-toggle:hover {
  background: var(--c-surface-hover);
  color: var(--c-text);
}

/* --- Topbar --- */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--topbar-height);
  padding: 0 var(--sp-lg);
  border-bottom: 1px solid var(--c-border);
  background: var(--c-surface);
  flex-shrink: 0;
}

.topbar-left {
  display: flex;
  align-items: center;
  gap: var(--sp-md);
}

.topbar-title {
  font-family: var(--f-display);
  font-size: 16px;
  font-weight: 600;
}

.topbar-right {
  display: flex;
  align-items: center;
  gap: var(--sp-md);
}

.topbar-clock {
  font-family: var(--f-mono);
  font-size: 13px;
  color: var(--c-text-secondary);
}

.topbar-user {
  display: flex;
  align-items: center;
  gap: var(--sp-sm);
  font-size: 13px;
  color: var(--c-text-secondary);
}

.topbar-user .user-avatar {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--c-border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: 600;
  color: var(--c-text);
}

.btn-logout {
  background: none;
  border: none;
  color: var(--c-text-muted);
  cursor: pointer;
  padding: var(--sp-xs) var(--sp-sm);
  border-radius: 4px;
  font-size: 12px;
  transition: color var(--t-fast);
}
.btn-logout:hover {
  color: var(--c-loss);
}

/* Mobile menu toggle */
.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  color: var(--c-text);
  font-size: 20px;
  cursor: pointer;
  padding: var(--sp-xs);
}

/* --- Main Content --- */
.main-content {
  flex: 1;
  padding: var(--sp-lg);
  overflow-y: auto;
}

/* --- Card / Panel --- */
.card {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: 4px;
  overflow: hidden;
}

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

.card-header h3 {
  font-family: var(--f-display);
  font-size: 14px;
  font-weight: 600;
  color: var(--c-text);
}

.card-body {
  padding: var(--sp-lg);
}

.card-body-compact {
  padding: var(--sp-md);
}

/* --- Stats Cards --- */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: var(--sp-md);
  margin-bottom: var(--sp-lg);
}

.stat-card {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: 4px;
  padding: var(--sp-md) var(--sp-lg);
}

.stat-card .stat-label {
  font-size: 12px;
  color: var(--c-text-muted);
  margin-bottom: var(--sp-xs);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.stat-card .stat-value {
  font-family: var(--f-mono);
  font-size: 22px;
  font-weight: 600;
  color: var(--c-text);
  line-height: 1.2;
}

.stat-card .stat-sub {
  font-size: 12px;
  color: var(--c-text-secondary);
  margin-top: var(--sp-xs);
}

.stat-card .stat-value.positive { color: var(--c-accent); }
.stat-card .stat-value.negative { color: var(--c-loss); }
.stat-card .stat-value.warn { color: var(--c-warn); }

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

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

.data-table th {
  text-align: left;
  padding: var(--sp-sm) var(--sp-md);
  font-weight: 600;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--c-text-muted);
  border-bottom: 1px solid var(--c-border);
  white-space: nowrap;
}

.data-table td {
  padding: var(--sp-sm) var(--sp-md);
  border-bottom: 1px solid var(--c-border);
  white-space: nowrap;
}

.data-table tbody tr {
  transition: background var(--t-fast);
}

.data-table tbody tr:hover {
  background: var(--c-surface-hover);
}

.data-table .mono {
  font-family: var(--f-mono);
  font-size: 12px;
}

.data-table .positive { color: var(--c-accent); }
.data-table .negative { color: var(--c-loss); }

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-xs);
  padding: var(--sp-sm) var(--sp-md);
  font-size: 13px;
  font-weight: 500;
  border: 1px solid transparent;
  border-radius: 4px;
  cursor: pointer;
  transition: background var(--t-fast), border-color var(--t-fast), color var(--t-fast);
  white-space: nowrap;
  line-height: 1.4;
}

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

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

.btn-ghost {
  background: transparent;
  color: var(--c-text-secondary);
  border-color: var(--c-border);
}
.btn-ghost:hover:not(:disabled) {
  background: var(--c-surface-hover);
  color: var(--c-text);
  border-color: var(--c-border-light);
}

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

.btn-sm {
  padding: var(--sp-xs) var(--sp-sm);
  font-size: 12px;
}

/* --- Status Tags --- */
.tag {
  display: inline-flex;
  align-items: center;
  padding: 2px 8px;
  font-size: 11px;
  font-weight: 600;
  border-radius: 3px;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

.tag-long {
  background: rgba(16, 185, 129, 0.15);
  color: var(--c-accent);
}

.tag-short {
  background: rgba(239, 68, 68, 0.15);
  color: var(--c-loss);
}

.tag-active {
  background: rgba(16, 185, 129, 0.15);
  color: var(--c-accent);
}

.tag-inactive {
  background: rgba(100, 116, 139, 0.2);
  color: var(--c-text-muted);
}

.tag-warn {
  background: rgba(245, 158, 11, 0.15);
  color: var(--c-warn);
}

.tag-info {
  background: rgba(59, 130, 246, 0.15);
  color: var(--c-info);
}

/* --- Forms --- */
.form-group {
  margin-bottom: var(--sp-md);
}

.form-group label {
  display: block;
  font-size: 12px;
  font-weight: 500;
  color: var(--c-text-secondary);
  margin-bottom: var(--sp-xs);
}

.form-control {
  width: 100%;
  padding: var(--sp-sm) var(--sp-md);
  background: var(--c-bg);
  border: 1px solid var(--c-border);
  border-radius: 4px;
  color: var(--c-text);
  font-family: var(--f-mono);
  font-size: 13px;
  transition: border-color var(--t-fast);
}

.form-control:focus {
  outline: none;
  border-color: var(--c-accent);
}

.form-control::placeholder {
  color: var(--c-text-muted);
}

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

.form-hint {
  font-size: 11px;
  color: var(--c-text-muted);
  margin-top: var(--sp-xs);
}

/* --- Toggle Switch --- */
.toggle {
  position: relative;
  display: inline-block;
  width: 36px;
  height: 20px;
}

.toggle input {
  opacity: 0;
  width: 0;
  height: 0;
}

.toggle-slider {
  position: absolute;
  cursor: pointer;
  top: 0; left: 0; right: 0; bottom: 0;
  background: var(--c-border);
  border-radius: 10px;
  transition: background var(--t-fast);
}

.toggle-slider::before {
  content: '';
  position: absolute;
  width: 16px;
  height: 16px;
  left: 2px;
  bottom: 2px;
  background: var(--c-text);
  border-radius: 50%;
  transition: transform var(--t-fast);
}

.toggle input:checked + .toggle-slider {
  background: var(--c-accent);
}

.toggle input:checked + .toggle-slider::before {
  transform: translateX(16px);
}

/* --- Strategy Card --- */
.strategy-card {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: 4px;
  padding: var(--sp-lg);
  margin-bottom: var(--sp-md);
}

.strategy-card .strategy-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--sp-md);
}

.strategy-card .strategy-name {
  font-family: var(--f-display);
  font-size: 15px;
  font-weight: 600;
}

.strategy-card .strategy-modules {
  display: flex;
  gap: var(--sp-xs);
  flex-wrap: wrap;
  margin-bottom: var(--sp-md);
}

.strategy-card .module-tag {
  font-size: 10px;
  padding: 2px 6px;
  background: rgba(59, 130, 246, 0.12);
  color: var(--c-info);
  border-radius: 3px;
  font-family: var(--f-mono);
}

.strategy-card .strategy-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
  gap: var(--sp-md);
}

.strategy-card .strategy-stat {
  text-align: center;
}

.strategy-card .strategy-stat .label {
  font-size: 11px;
  color: var(--c-text-muted);
  margin-bottom: 2px;
}

.strategy-card .strategy-stat .value {
  font-family: var(--f-mono);
  font-size: 15px;
  font-weight: 600;
}

/* --- BTC Status Indicator --- */
.btc-status {
  display: flex;
  align-items: center;
  gap: var(--sp-lg);
  padding: var(--sp-md) var(--sp-lg);
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: 4px;
  margin-bottom: var(--sp-lg);
}

.btc-status .btc-item {
  display: flex;
  align-items: center;
  gap: var(--sp-sm);
}

.btc-status .btc-label {
  font-size: 12px;
  color: var(--c-text-muted);
}

.btc-status .btc-value {
  font-family: var(--f-mono);
  font-size: 13px;
  font-weight: 600;
}

.btc-status .btc-value.bull { color: var(--c-accent); }
.btc-status .btc-value.bear { color: var(--c-loss); }
.btc-status .btc-value.range { color: var(--c-warn); }

/* --- Engine Status Bar --- */
.engine-bar {
  display: flex;
  align-items: center;
  gap: var(--sp-md);
  padding: var(--sp-md) var(--sp-lg);
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: 4px;
  margin-bottom: var(--sp-lg);
}

.engine-bar .engine-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}

.engine-bar .engine-dot.running { background: var(--c-accent); }
.engine-bar .engine-dot.stopped { background: var(--c-loss); }

.engine-bar .engine-label {
  font-size: 13px;
  font-weight: 500;
}

.engine-bar .engine-detail {
  font-size: 12px;
  color: var(--c-text-muted);
  font-family: var(--f-mono);
}

/* --- Section Grid --- */
.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--sp-lg);
}

.grid-3 {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: var(--sp-lg);
}

/* --- Login Page --- */
.login-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--c-bg);
  padding: var(--sp-lg);
}

.login-card {
  width: 100%;
  max-width: 380px;
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: 4px;
  padding: var(--sp-2xl);
}

.login-card .login-brand {
  text-align: center;
  margin-bottom: var(--sp-xl);
}

.login-card .login-brand h1 {
  font-family: var(--f-display);
  font-size: 24px;
  font-weight: 700;
  color: var(--c-accent);
}

.login-card .login-brand p {
  font-size: 13px;
  color: var(--c-text-muted);
  margin-top: var(--sp-xs);
}

.login-card .form-group {
  margin-bottom: var(--sp-md);
}

.login-card .btn-primary {
  width: 100%;
  padding: var(--sp-sm) var(--sp-md);
  font-size: 14px;
}

.login-error {
  background: rgba(239, 68, 68, 0.1);
  border: 1px solid rgba(239, 68, 68, 0.3);
  color: var(--c-loss);
  padding: var(--sp-sm) var(--sp-md);
  border-radius: 4px;
  font-size: 13px;
  margin-bottom: var(--sp-md);
  display: none;
}

.login-error.visible {
  display: block;
}

/* --- Hot Scan --- */
.hot-rank {
  font-family: var(--f-mono);
  font-weight: 600;
  color: var(--c-text-muted);
  width: 24px;
  text-align: center;
}

.hot-rank.top3 {
  color: var(--c-warn);
}

/* --- Loading / Empty States --- */
.loading-state {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--sp-2xl);
  color: var(--c-text-muted);
  font-size: 13px;
}

.empty-state {
  text-align: center;
  padding: var(--sp-2xl);
  color: var(--c-text-muted);
  font-size: 13px;
}

/* --- Toast / Notification --- */
.toast {
  position: fixed;
  top: var(--sp-lg);
  right: var(--sp-lg);
  padding: var(--sp-sm) var(--sp-lg);
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: 4px;
  font-size: 13px;
  z-index: 1000;
  opacity: 0;
  transform: translateY(-10px);
  transition: opacity var(--t-normal), transform var(--t-normal);
}

.toast.visible {
  opacity: 1;
  transform: translateY(0);
}

.toast.success { border-left: 3px solid var(--c-accent); }
.toast.error { border-left: 3px solid var(--c-loss); }
.toast.warning { border-left: 3px solid var(--c-warn); }

/* --- Responsive --- */
@media (max-width: 1024px) {
  .grid-2, .grid-3 {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .sidebar {
    transform: translateX(-100%);
    width: var(--sidebar-width);
  }

  .sidebar.mobile-open {
    transform: translateX(0);
  }

  .sidebar.collapsed {
    width: var(--sidebar-width);
  }

  .main-wrapper,
  .main-wrapper.sidebar-collapsed {
    margin-left: 0;
  }

  .mobile-menu-btn {
    display: block;
  }

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

  .main-content {
    padding: var(--sp-md);
  }

  .btc-status {
    flex-wrap: wrap;
  }
}

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

  .form-row {
    grid-template-columns: 1fr;
  }
}

/* --- Overlay for mobile sidebar --- */
.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: 99;
}

.sidebar-overlay.visible {
  display: block;
}

/* --- Utility Classes --- */
.text-positive { color: var(--c-accent) !important; }
.text-negative { color: var(--c-loss) !important; }
.text-warn { color: var(--c-warn) !important; }
.text-muted { color: var(--c-text-muted) !important; }
.text-secondary { color: var(--c-text-secondary) !important; }
.font-mono { font-family: var(--f-mono); }
.font-display { font-family: var(--f-display); }

.mt-sm { margin-top: var(--sp-sm); }
.mt-md { margin-top: var(--sp-md); }
.mt-lg { margin-top: var(--sp-lg); }
.mb-sm { margin-bottom: var(--sp-sm); }
.mb-md { margin-bottom: var(--sp-md); }
.mb-lg { margin-bottom: var(--sp-lg); }

.flex { display: flex; }
.flex-center { display: flex; align-items: center; justify-content: center; }
.flex-between { display: flex; align-items: center; justify-content: space-between; }
.gap-sm { gap: var(--sp-sm); }
.gap-md { gap: var(--sp-md); }

.w-full { width: 100%; }
.truncate { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

/* --- Mode Switcher --- */
.mode-switcher {
  display: flex;
  gap: 0;
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: 6px;
  padding: 3px;
  margin-bottom: var(--sp-lg);
  width: fit-content;
}

.mode-tab {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 20px;
  border: none;
  border-radius: 4px;
  background: transparent;
  color: var(--c-text-muted);
  font-family: var(--f-display);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: all 200ms ease;
}

.mode-tab:hover {
  color: var(--c-text-secondary);
  background: var(--c-surface-hover);
}

.mode-tab.active-paper {
  background: rgba(59, 130, 246, 0.12);
  color: var(--c-info);
  box-shadow: 0 0 0 1px rgba(59, 130, 246, 0.25);
}

.mode-tab.active-live {
  background: rgba(239, 68, 68, 0.12);
  color: var(--c-loss);
  box-shadow: 0 0 0 1px rgba(239, 68, 68, 0.25);
}

.mode-tab .live-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--c-loss);
  box-shadow: 0 0 6px rgba(239, 68, 68, 0.5);
  animation: livePulse 2s ease-in-out infinite;
}

@keyframes livePulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

/* --- Data refresh transition --- */
.data-refresh {
  transition: opacity var(--t-fast);
}

.data-refresh.refreshing {
  opacity: 0.6;
}