:root {
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji";
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;

  /* Light Theme */
  --bg-page: #f8fafc;
  --bg-card: #ffffff;
  --bg-card-subtle: #f1f5f9;
  --bg-input: #ffffff;
  --bg-input-focus: #ffffff;
  --border-color: #e2e8f0;
  --border-color-focus: #3b82f6;
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #64748b;
  --text-inverse: #ffffff;

  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --primary-light: #eff6ff;
  
  --success: #10b981;
  --success-bg: #ecfdf5;
  --danger: #ef4444;
  --danger-bg: #fef2f2;
  --danger-border: #fecaca;

  --card-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
  --card-shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.07), 0 4px 6px -4px rgba(0, 0, 0, 0.05);
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

[data-theme="dark"] {
  --bg-page: #0b0f17;
  --bg-card: #151d2c;
  --bg-card-subtle: #1e293b;
  --bg-input: #0f172a;
  --bg-input-focus: #1e293b;
  --border-color: #334155;
  --border-color-focus: #60a5fa;
  --text-primary: #f8fafc;
  --text-secondary: #cbd5e1;
  --text-muted: #94a3b8;
  --text-inverse: #0f172a;

  --primary: #3b82f6;
  --primary-hover: #60a5fa;
  --primary-light: #1e293b;

  --success: #34d399;
  --success-bg: #064e3b;
  --danger: #f87171;
  --danger-bg: #450a0a;
  --danger-border: #7f1d1d;

  --card-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
  --card-shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4);
}

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-page);
  color: var(--text-primary);
  line-height: 1.5;
  min-height: 100vh;
  transition: background-color 0.3s ease, color 0.3s ease;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: 820px;
  margin: 0 auto;
  padding: 2.5rem 1.25rem 4rem;
}

/* Header */
header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 2rem;
  padding-bottom: 1.25rem;
  border-bottom: 1px solid var(--border-color);
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.logo-icon {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--primary), #8b5cf6);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  font-weight: 700;
  font-size: 1.25rem;
  box-shadow: 0 4px 10px rgba(37, 99, 235, 0.25);
}

.brand h1 {
  font-size: 1.6rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}

.brand p {
  font-size: 0.875rem;
  color: var(--text-muted);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.theme-toggle {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}

.theme-toggle:hover {
  background: var(--bg-card-subtle);
  color: var(--text-primary);
}

/* Card */
.card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--card-shadow);
  padding: 2rem;
  margin-bottom: 1.75rem;
  transition: var(--transition);
}

.card-title {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 1.25rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

/* Form inputs grid */
.inputs-grid {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.input-row {
  display: grid;
  grid-template-columns: 160px 1fr;
  align-items: flex-start;
  gap: 1rem;
}

@media (max-width: 640px) {
  .input-row {
    grid-template-columns: 1fr;
    gap: 0.5rem;
  }
}

.input-label-group {
  padding-top: 0.6rem;
}

.input-label {
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--text-primary);
  display: block;
}

.input-hint {
  font-size: 0.775rem;
  color: var(--text-muted);
  margin-top: 2px;
}

.input-wrapper {
  position: relative;
  display: flex;
  flex-direction: column;
}

.input-container {
  display: flex;
  position: relative;
  align-items: center;
}

.form-input {
  width: 100%;
  padding: 0.75rem 3rem 0.75rem 1rem;
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-weight: 600;
  background-color: var(--bg-input);
  color: var(--text-primary);
  border: 1.5px solid var(--border-color);
  border-radius: var(--radius-md);
  outline: none;
  transition: var(--transition);
}

.form-input:focus {
  border-color: var(--border-color-focus);
  background-color: var(--bg-input-focus);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
}

.form-input.is-invalid {
  border-color: var(--danger);
  box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.15);
}

.copy-btn {
  position: absolute;
  right: 0.5rem;
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 0.4rem;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}

.copy-btn:hover {
  color: var(--primary);
  background: var(--bg-card-subtle);
}

.error-message {
  display: none;
  margin-top: 0.4rem;
  font-size: 0.8rem;
  color: var(--danger);
  font-weight: 500;
}

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

/* Presets bar */
.presets-container {
  margin-top: 1.5rem;
  padding-top: 1.25rem;
  border-top: 1px dashed var(--border-color);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
}

.presets-label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-right: 0.25rem;
  white-space: nowrap;
  flex-shrink: 0;
}

.preset-chip {
  background: var(--bg-card-subtle);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 600;
  padding: 0.35rem 0.75rem;
  border-radius: 9999px;
  cursor: pointer;
  white-space: nowrap;
  flex-shrink: 0;
  transition: var(--transition);
}

.preset-chip:hover {
  background: var(--primary-light);
  border-color: var(--primary);
  color: var(--primary);
  transform: translateY(-1px);
}

.reset-btn {
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  font-size: 0.825rem;
  font-weight: 500;
  padding: 0.35rem 0.75rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  white-space: nowrap;
  flex-shrink: 0;
  transition: var(--transition);
}

.reset-btn:hover {
  color: var(--danger);
  border-color: var(--danger);
  background: var(--danger-bg);
}

/* Summary Grid */
.summary-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
}

.stat-box {
  background: var(--bg-card-subtle);
  border: 1px solid var(--border-color);
  padding: 1rem 1.25rem;
  border-radius: var(--radius-md);
  display: flex;
  flex-direction: column;
}

.stat-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  margin-bottom: 0.25rem;
}

.stat-value {
  font-family: var(--font-mono);
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text-primary);
}

/* Stake & Payout Calculator */
.calc-controls {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 1.25rem;
  align-items: center;
}

@media (max-width: 640px) {
  .calc-controls {
    grid-template-columns: 1fr;
  }
}

.calc-stat-box {
  background: var(--bg-card-subtle);
  border: 1px solid var(--border-color);
  padding: 1rem 1.25rem;
  border-radius: var(--radius-md);
}

.calc-stat-box.highlight {
  background: var(--primary-light);
  border-color: var(--primary);
}

.calc-stat-box.highlight .stat-value {
  color: var(--primary);
}

/* Toast */
.toast {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  background: var(--text-primary);
  color: var(--bg-page);
  padding: 0.6rem 1rem;
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  font-weight: 500;
  box-shadow: var(--card-shadow-lg);
  opacity: 0;
  transform: translateY(10px);
  pointer-events: none;
  transition: opacity 0.2s ease, transform 0.2s ease;
  z-index: 1000;
}

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

/* Guide & Formulas */
.guide-accordion details {
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 0.85rem 1rem;
  background: var(--bg-card-subtle);
  margin-bottom: 0.5rem;
}

.guide-accordion summary {
  cursor: pointer;
  font-weight: 600;
  font-size: 0.95rem;
  user-select: none;
  outline: none;
  color: var(--text-primary);
}

.guide-content {
  margin-top: 0.75rem;
  padding-top: 0.75rem;
  border-top: 1px solid var(--border-color);
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.guide-content code {
  font-family: var(--font-mono);
  background: var(--bg-card);
  padding: 0.15rem 0.4rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
  color: var(--primary);
}

footer {
  text-align: center;
  margin-top: 3rem;
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* Tab Navigation */
.tabs-nav {
  display: flex;
  gap: 0.5rem;
  background-color: var(--bg-card-subtle);
  border: 1px solid var(--border-color);
  padding: 0.35rem;
  border-radius: var(--radius-md);
  margin-bottom: 1.75rem;
}

.tab-btn {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.65rem 1.25rem;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-secondary);
  background: transparent;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: var(--transition);
}

.tab-btn:hover {
  color: var(--text-primary);
}

.tab-btn.active {
  background-color: var(--bg-card);
  color: var(--primary);
  border-color: var(--border-color);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

.tab-panel {
  display: none;
}

.tab-panel.active {
  display: block;
  animation: fadeIn 0.2s ease-in-out;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(4px); }
  to { opacity: 1; transform: translateY(0); }
}

.tab-description {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-top: -0.5rem;
  margin-bottom: 1.5rem;
}

/* Vig Hero Card */
.vig-hero-card {
  background: linear-gradient(135deg, rgba(37, 99, 235, 0.08), rgba(139, 92, 246, 0.08));
  border: 1.5px solid var(--primary);
  border-radius: var(--radius-md);
  padding: 1.75rem 1.5rem;
  text-align: center;
}

[data-theme="dark"] .vig-hero-card {
  background: linear-gradient(135deg, rgba(59, 130, 246, 0.15), rgba(139, 92, 246, 0.15));
}

.vig-hero-label {
  display: block;
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--primary);
  margin-bottom: 0.35rem;
}

.vig-hero-val {
  font-family: var(--font-mono);
  font-size: 3rem;
  font-weight: 800;
  line-height: 1.1;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

.vig-hero-sub {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.stat-subtext {
  font-size: 0.775rem;
  color: var(--text-muted);
  margin-top: 0.25rem;
}

/* Fair Market Comparison */
.fair-market-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
}

@media (max-width: 640px) {
  .fair-market-grid {
    grid-template-columns: 1fr;
  }
}

.fair-market-box {
  background: var(--bg-card-subtle);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.25rem;
}

.fair-side-title {
  font-weight: 700;
  font-size: 0.95rem;
  margin-bottom: 0.85rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-primary);
}

.fair-stat-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.9rem;
  margin-bottom: 0.5rem;
}

.fair-stat-row strong {
  font-family: var(--font-mono);
  font-size: 1.05rem;
}

.fair-stat-row.highlight {
  margin-top: 0.75rem;
  padding-top: 0.75rem;
  border-top: 1px dashed var(--border-color);
}

.fair-stat-row.highlight strong {
  color: var(--primary);
  font-size: 1.25rem;
}

.text-muted-inline {
  color: var(--text-muted);
  font-family: var(--font-mono);
}