/* ==========================================================================
   Binance-Pro Dark Theme for Strategy Backtesting Lab
   Base Palette: #0b0e11 (bg), #181a20 (card), #2b313a (border), #F0B90B (accent)
   ========================================================================== */

:root {
  --bg-main: #0b0e11;
  --bg-card: #181a20;
  --bg-card-hover: #1e2329;
  --bg-input: #2b313a;
  --bg-subtle: #12161c;
  --border-color: #2b313a;
  --border-light: #373e4a;
  
  --accent-gold: #F0B90B;
  --accent-gold-hover: #e0aa08;
  --accent-gold-soft: rgba(240, 185, 11, 0.12);
  
  --color-green: #0ECB81;
  --color-green-soft: rgba(14, 203, 129, 0.15);
  --color-red: #F6465D;
  --color-red-soft: rgba(246, 70, 93, 0.15);
  --color-blue: #3861FB;
  
  --text-main: #EAECEF;
  --text-muted: #848E9C;
  --text-dim: #5E6673;
  
  --sidebar-width: 260px;
  --topbar-height: 56px;
  --bottombar-height: 60px;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --transition-fast: 0.15s ease;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background-color: var(--bg-main);
  color: var(--text-main);
  line-height: 1.5;
  font-size: 14px;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
  text-decoration: none;
}

/* ==========================================================================
   Layout Containers
   ========================================================================== */

.app-wrapper {
  display: flex;
  min-height: 100vh;
}

/* Desktop Sidebar */
.app-sidebar {
  width: var(--sidebar-width);
  background-color: var(--bg-card);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  position: fixed;
  top: 0;
  bottom: 0;
  left: 0;
  z-index: 100;
  overflow-y: auto;
  transition: transform var(--transition-fast);
}

.sidebar-brand {
  padding: 18px 20px;
  display: flex;
  align-items: center;
  gap: 10px;
  border-bottom: 1px solid var(--border-color);
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0.5px;
}

.brand-icon {
  color: var(--accent-gold);
  font-size: 20px;
}

.brand-badge {
  font-size: 10px;
  background-color: var(--accent-gold-soft);
  color: var(--accent-gold);
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  text-transform: uppercase;
}

.sidebar-nav {
  padding: 16px 12px;
  flex: 1;
}

.nav-group-title {
  font-size: 11px;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.8px;
  padding: 12px 10px 6px 10px;
  margin-top: 6px;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 9px 12px;
  border-radius: var(--radius-md);
  color: var(--text-muted);
  font-weight: 500;
  font-size: 13.5px;
  transition: all var(--transition-fast);
  margin-bottom: 3px;
}

.nav-item:hover {
  background-color: var(--bg-card-hover);
  color: var(--text-main);
}

.nav-item.active {
  background-color: var(--accent-gold-soft);
  color: var(--accent-gold);
  font-weight: 600;
}

.nav-item .icon {
  width: 18px;
  text-align: center;
  font-size: 15px;
}

.sidebar-footer {
  padding: 16px 20px;
  border-top: 1px solid var(--border-color);
  font-size: 11px;
  color: var(--text-dim);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.system-status-indicator {
  display: flex;
  align-items: center;
  gap: 6px;
  color: var(--color-green);
  font-weight: 600;
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--color-green);
  box-shadow: 0 0 6px var(--color-green);
}

/* Main Content Area */
.app-main {
  flex: 1;
  margin-left: var(--sidebar-width);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background-color: var(--bg-main);
}

/* Mobile Top Bar */
.mobile-topbar {
  display: none;
  height: var(--topbar-height);
  background-color: var(--bg-card);
  border-bottom: 1px solid var(--border-color);
  padding: 0 16px;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 90;
}

.mobile-brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  font-size: 15px;
}

.mobile-menu-btn {
  background: transparent;
  border: none;
  color: var(--text-main);
  font-size: 22px;
  cursor: pointer;
  padding: 6px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Mobile Drawer Overlay */
.drawer-backdrop {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.65);
  backdrop-filter: blur(2px);
  z-index: 95;
}

/* Mobile Bottom Navigation Bar */
.mobile-bottom-nav {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: var(--bottombar-height);
  background-color: var(--bg-card);
  border-top: 1px solid var(--border-color);
  z-index: 90;
  justify-content: space-around;
  align-items: center;
  padding: 0 6px;
}

.bottom-nav-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  font-size: 10px;
  padding: 6px 10px;
  border-radius: var(--radius-sm);
  text-align: center;
  flex: 1;
}

.bottom-nav-item .b-icon {
  font-size: 18px;
  margin-bottom: 2px;
}

.bottom-nav-item.active {
  color: var(--accent-gold);
}

/* Content Container */
.page-container {
  padding: 24px 32px;
  max-width: 1440px;
  width: 100%;
  margin: 0 auto;
  flex: 1;
}

/* Page Header */
.page-header {
  margin-bottom: 24px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.page-title-group h1 {
  font-size: 22px;
  font-weight: 700;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 10px;
}

.page-title-group p {
  color: var(--text-muted);
  font-size: 13px;
  margin-top: 4px;
}

/* ==========================================================================
   UI Components (Cards, Grids, Forms, Tables, Badges)
   ========================================================================== */

/* Metric Cards */
.metrics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
  margin-bottom: 24px;
}

.metric-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 16px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.metric-label {
  font-size: 12px;
  color: var(--text-muted);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.metric-value {
  font-size: 22px;
  font-weight: 700;
  color: var(--text-main);
  margin-top: 6px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, monospace;
}

.metric-value.profit {
  color: var(--color-green);
}

.metric-value.loss {
  color: var(--color-red);
}

.metric-value.gold {
  color: var(--accent-gold);
}

.metric-sub {
  font-size: 11px;
  color: var(--text-muted);
  margin-top: 4px;
}

/* Cards & Panels */
.card-panel {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 20px;
  margin-bottom: 24px;
}

.card-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* Form Controls */
.form-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form-label {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-muted);
}

.form-control {
  background-color: var(--bg-input);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 9px 12px;
  border-radius: var(--radius-sm);
  font-size: 13.5px;
  outline: none;
  transition: border-color var(--transition-fast);
}

.form-control:focus {
  border-color: var(--accent-gold);
}

select.form-control {
  cursor: pointer;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 9px 18px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 13.5px;
  border: none;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-primary {
  background-color: var(--accent-gold);
  color: #000;
}

.btn-primary:hover {
  background-color: var(--accent-gold-hover);
}

.btn-secondary {
  background-color: var(--bg-input);
  color: var(--text-main);
  border: 1px solid var(--border-color);
}

.btn-secondary:hover {
  background-color: var(--bg-card-hover);
}

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

/* Badges */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
}

.badge-green {
  background-color: var(--color-green-soft);
  color: var(--color-green);
}

.badge-red {
  background-color: var(--color-red-soft);
  color: var(--color-red);
}

.badge-gold {
  background-color: var(--accent-gold-soft);
  color: var(--accent-gold);
}

.badge-muted {
  background-color: var(--bg-input);
  color: var(--text-muted);
}

/* Tables */
.table-responsive {
  width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.pro-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 13px;
}

.pro-table th {
  background-color: var(--bg-subtle);
  color: var(--text-muted);
  font-weight: 600;
  padding: 10px 14px;
  border-bottom: 1px solid var(--border-color);
  white-space: nowrap;
}

.pro-table td {
  padding: 10px 14px;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-main);
  white-space: nowrap;
}

.pro-table tbody tr:hover {
  background-color: var(--bg-card-hover);
}

/* Charts Container */
.chart-container {
  width: 100%;
  min-height: 420px;
  position: relative;
}

/* Spinner */
.spinner {
  display: inline-block;
  width: 16px;
  height: 16px;
  border: 2px solid rgba(255,255,255,0.3);
  border-radius: 50%;
  border-top-color: #fff;
  animation: spin 0.8s ease-in-out infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* Toast Notifications */
#toast-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 9999;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.toast {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  padding: 12px 18px;
  border-radius: var(--radius-md);
  box-shadow: 0 8px 24px rgba(0,0,0,0.5);
  font-size: 13px;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 10px;
  animation: slideIn 0.2s ease-out;
  min-width: 260px;
}

.toast.toast-success {
  border-left: 4px solid var(--color-green);
}

.toast.toast-error {
  border-left: 4px solid var(--color-red);
}

.toast.toast-info {
  border-left: 4px solid var(--accent-gold);
}

@keyframes slideIn {
  from { transform: translateX(100%); opacity: 0; }
  to { transform: translateX(0); opacity: 1; }
}

/* ==========================================================================
   Responsive Breakpoints
   ========================================================================== */

@media (max-width: 992px) {
  .app-sidebar {
    transform: translateX(-100%);
    box-shadow: 4px 0 16px rgba(0,0,0,0.7);
  }

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

  .drawer-backdrop.open {
    display: block;
  }

  .app-main {
    margin-left: 0;
    margin-bottom: var(--bottombar-height);
  }

  .mobile-topbar {
    display: flex;
  }

  .mobile-bottom-nav {
    display: flex;
  }

  .page-container {
    padding: 16px;
  }

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

@media (max-width: 576px) {
  .metrics-grid {
    grid-template-columns: 1fr;
  }

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