:root {
  --radius: 14px;
  --glass: rgba(255,255,255,0.04);
  --glass-stroke: rgba(255,255,255,0.08);
  --shadow-1: 0 10px 30px rgba(0,0,0,0.25);
  --shadow-2: 0 20px 50px rgba(0,0,0,0.35);
}

/* Light theme overrides */
body.theme-light {
  --background-color: #f6f7fb;
  --surface-color: #ffffff;
  --card-color: #ffffff;
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #64748b;
  --border-color: #e2e8f0;
  --accent-color: #0ea5e9;
  --primary-color: #0ea5e9;
  --secondary-color: #0369a1;
}

.container { gap: 18px; }

/* App layout: sidebar + main */
.app-layout {
  display: grid;
  grid-template-columns: minmax(680px, 1fr) 320px;
  gap: 18px;
}

.sidebar {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.sidebar .panel {
  border: 1px solid var(--glass-stroke);
  border-radius: var(--radius);
  background: linear-gradient(180deg, var(--glass), transparent);
  padding: 14px;
  box-shadow: var(--shadow-1);
}

.main {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

/* Make header left-aligned and compact */
.header { text-align: left; border: none; padding: 0; }
.header .header-content h1 { font-size: 1.6rem; margin: 0; }
.header .header-content p { margin-top: 4px; font-size: .95rem; }

/* Left-align mode selector and game selector */
.mode-selector { justify-content: flex-start; }
.game-selector { text-align: left; margin: 0; }

/* Horizontal tabs under main header */
.mode-tabs {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 10px;
  align-items: center;
  margin-bottom: 8px;
  background: white;
  border: 1px solid var(--glass-stroke);
  border-radius: 10px;
  padding: 6px;
  box-shadow: var(--shadow-1);
}
.mode-tabs .mode-left select {
  background: var(--surface-color);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  padding: 10px 12px;
  border-radius: 8px;
  min-width: 220px;
}
.mode-tabs .mode-right { display: flex; gap: 8px; }
.mode-tabs .mode-btn { padding: 10px 14px; white-space: nowrap; }

.visually-hidden {
  position: absolute !important;
  clip: rect(1px, 1px, 1px, 1px);
  padding: 0 !important;
  border: 0 !important;
  height: 1px !important; width: 1px !important;
  overflow: hidden;
}

/* Widen input sections visually */
.card-input-section, .results-section { padding: 1.25rem; }

/* Responsive: collapse sidebar */
@media (max-width: 1180px) {
  .app-layout { grid-template-columns: 1fr; }
  .sidebar { order: 2; }
  .main { order: 1; }
}

/* Topbar */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: linear-gradient(180deg, var(--glass), transparent);
  border: 1px solid var(--glass-stroke);
  border-radius: var(--radius);
  padding: 12px 16px;
  margin-top: 16px;
  box-shadow: var(--shadow-1);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
}
.topbar .brand {
  display: flex; align-items: center; gap: 10px;
  font-weight: 700; letter-spacing: 0.2px;
  color: var(--text-primary);
}
.topbar .brand i { color: var(--accent-color); }
.topbar-actions { display: flex; align-items: center; gap: 10px; }

.language-switcher {
    display: flex;
    align-items: center;
}

.language-toggle {
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    cursor: pointer;
    font-size: 0.875rem;
    font-weight: 500;
    padding: 0.5rem 0.75rem;
    transition: all 0.2s ease;
    height: 40px;
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.language-toggle:hover {
    background: var(--hover-color);
    border-color: var(--accent-color);
    transform: translateY(-1px);
}

.language-toggle:active {
    transform: translateY(0);
}
.theme-toggle {
  background: var(--surface-color);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  width: 40px; height: 40px; border-radius: 10px;
  display: inline-flex; align-items: center; justify-content: center;
  cursor: pointer; transition: all .2s ease;
}
.theme-toggle:hover { transform: translateY(-1px); box-shadow: var(--shadow-1); }
body.theme-light .theme-toggle i { color: #f59e0b; }

/* Panel lift + glass effect */
.card-input-section, .results-section, .result-card, .comparison-hand, .help-section details {
  border-radius: var(--radius);
  border: 1px solid var(--glass-stroke);
  background: linear-gradient(180deg, var(--glass), transparent);
  box-shadow: var(--shadow-1);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
}

/* Buttons modern */
.submit-btn {
  border-radius: 12px;
  letter-spacing: .2px;
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  box-shadow: var(--shadow-2);
}
.mode-btn {
  border-radius: 12px;
  border: 1px solid var(--glass-stroke);
  background: linear-gradient(180deg, var(--glass), transparent);
  box-shadow: var(--shadow-1);
}
.mode-btn.active { background: var(--primary-color); color: #fff; border-color: transparent; }

/* Inputs modern */
.card-input {
  border-radius: 10px;
  border: 1px solid var(--border-color);
  background: var(--surface-color);
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.03);
}
.card-input:focus {
  box-shadow: 0 0 0 3px rgba(14,165,233,.25);
  transition: box-shadow .15s ease;
}

/* Loading and errors */
.loading .spinner { border-color: var(--border-color); border-top-color: var(--accent-color); }
.error-message { border-radius: 10px; box-shadow: var(--shadow-1); }

/* Comparison winner badge polish */
.comparison-hand.winner::after { box-shadow: 0 6px 18px rgba(34,197,94,.4); }

/* Footer subtle */
.footer { opacity: .9; }

/* Equity Display Styles */
.equity-display {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.equity-chart {
  background: var(--card-color);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 16px;
}

.equity-bar {
  display: flex;
  height: 60px;
  border-radius: 8px;
  overflow: hidden;
  border: 1px solid var(--border-color);
  position: relative;
}

.equity-segment {
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  font-size: 14px;
  color: white;
  text-shadow: 0 1px 2px rgba(0,0,0,0.3);
  transition: all 0.3s ease;
}

.equity-segment.hand1 {
  background: linear-gradient(135deg, #22c55e, #16a34a);
}

.equity-segment.hand2 {
  background: linear-gradient(135deg, #ef4444, #dc2626);
}

.equity-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.equity-stat-card {
  background: var(--card-color);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 16px;
  text-align: center;
}

.equity-stat-card.winner {
  border-color: #22c55e;
  background: linear-gradient(135deg, rgba(34,197,94,0.1), rgba(34,197,94,0.05));
}

.equity-stat-title {
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.equity-stat-value {
  font-size: 24px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.equity-stat-subtitle {
  font-size: 12px;
  color: var(--text-muted);
}

.equity-details {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 12px;
  margin-top: 16px;
}

.equity-detail-item {
  background: var(--surface-color);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 12px;
  text-align: center;
}

.equity-detail-label {
  font-size: 12px;
  color: var(--text-secondary);
  margin-bottom: 4px;
}

.equity-detail-value {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
}

.mode-description {
  color: var(--text-secondary);
  font-size: 14px;
  margin-bottom: 20px;
  padding: 12px 16px;
  background: var(--surface-color);
  border: 1px solid var(--border-color);
  border-radius: 8px;
}

/* Responsive polish */
@media (max-width: 768px) {
  .topbar { margin-top: 10px; }
  
  .equity-stats {
    grid-template-columns: 1fr;
  }
  
  .equity-details {
    grid-template-columns: 1fr 1fr;
  }
}