/* ==========================================================================
   PredictPaper Design System
   Paper Trading for Prediction Markets
   ========================================================================== */

/* --------------------------------------------------------------------------
   Design Tokens
   -------------------------------------------------------------------------- */
:root {
  /* Colors - Fintech/Crypto palette */
  --color-primary: #F59E0B;
  --color-primary-hover: #D97706;
  --color-primary-light: #FBBF24;
  --color-secondary: #8B5CF6;
  --color-secondary-hover: #7C3AED;
  
  /* Semantic Colors */
  --color-success: #22C55E;
  --color-success-bg: rgba(34, 197, 94, 0.1);
  --color-danger: #EF4444;
  --color-danger-bg: rgba(239, 68, 68, 0.1);
  --color-warning: #F59E0B;
  --color-info: #3B82F6;
  
  /* Background Colors - Dark Theme */
  --bg-primary: #0F172A;
  --bg-secondary: #1E293B;
  --bg-tertiary: #334155;
  --bg-card: #1E293B;
  --bg-hover: #334155;
  
  /* Text Colors */
  --text-primary: #F8FAFC;
  --text-secondary: #94A3B8;
  --text-tertiary: #64748B;
  --text-muted: #475569;
  
  /* Border Colors */
  --border-default: #334155;
  --border-hover: #475569;
  --border-focus: #F59E0B;
  
  /* Typography Scale */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
  
  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 1.875rem;
  --text-4xl: 2.25rem;
  
  --font-normal: 400;
  --font-medium: 500;
  --font-semibold: 600;
  --font-bold: 700;
  
  /* Spacing Scale */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  
  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-full: 9999px;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.2), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.3), 0 4px 6px -4px rgba(0, 0, 0, 0.2);
  --shadow-glow: 0 0 20px rgba(245, 158, 11, 0.3);
  
  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 200ms ease;
  --transition-slow: 300ms ease;
}

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

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-family);
  font-size: var(--text-base);
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  min-height: 100vh;
}

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

.main-content {
  flex: 1;
  padding: var(--space-6);
  max-width: 1400px;
  margin: 0 auto;
  width: 100%;
}

.grid {
  display: grid;
  gap: var(--space-6);
}

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

.grid-3 {
  grid-template-columns: repeat(3, 1fr);
}

.grid-4 {
  grid-template-columns: repeat(4, 1fr);
}

@media (max-width: 1024px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 640px) {
  .grid-4,
  .grid-3,
  .grid-2 { grid-template-columns: 1fr; }
  
  .main-content { padding: var(--space-4); }
}

/* --------------------------------------------------------------------------
   Header / Navigation
   -------------------------------------------------------------------------- */
.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4) var(--space-6);
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-default);
  position: sticky;
  top: 0;
  z-index: 100;
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-size: var(--text-xl);
  font-weight: var(--font-bold);
  color: var(--text-primary);
  text-decoration: none;
}

.logo-icon {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-lg);
}

.nav {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.nav-link {
  padding: var(--space-2) var(--space-4);
  color: var(--text-secondary);
  text-decoration: none;
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.nav-link:hover,
.nav-link.active {
  color: var(--text-primary);
  background: var(--bg-hover);
}

.nav-link.active {
  color: var(--color-primary);
}

/* --------------------------------------------------------------------------
   Cards
   -------------------------------------------------------------------------- */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  transition: all var(--transition-base);
}

.card:hover {
  border-color: var(--border-hover);
}

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-4);
}

.card-title {
  font-size: var(--text-lg);
  font-weight: var(--font-semibold);
  color: var(--text-primary);
}

.card-subtitle {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  margin-top: var(--space-1);
}

/* --------------------------------------------------------------------------
   Portfolio Stats
   -------------------------------------------------------------------------- */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-4);
  margin-bottom: var(--space-6);
}

@media (max-width: 768px) {
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
}

.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
}

.stat-label {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  margin-bottom: var(--space-2);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.stat-value {
  font-size: var(--text-2xl);
  font-weight: var(--font-bold);
  color: var(--text-primary);
  font-family: var(--font-mono);
}

.stat-value.positive {
  color: var(--color-success);
}

.stat-value.negative {
  color: var(--color-danger);
}

.stat-change {
  font-size: var(--text-sm);
  margin-top: var(--space-1);
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.stat-change.positive {
  color: var(--color-success);
}

.stat-change.negative {
  color: var(--color-danger);
}

/* --------------------------------------------------------------------------
   Market Cards
   -------------------------------------------------------------------------- */
.markets-grid {
  display: grid;
  gap: var(--space-4);
}

.market-card {
  background: var(--bg-card);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  transition: all var(--transition-base);
  cursor: pointer;
}

.market-card:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-glow);
  transform: translateY(-2px);
}

.market-card:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.market-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: var(--space-4);
}

.market-category {
  font-size: var(--text-xs);
  font-weight: var(--font-medium);
  color: var(--color-secondary);
  background: rgba(139, 92, 246, 0.1);
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-full);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.market-volume {
  font-size: var(--text-xs);
  color: var(--text-tertiary);
}

.market-question {
  font-size: var(--text-base);
  font-weight: var(--font-medium);
  color: var(--text-primary);
  line-height: 1.5;
  margin-bottom: var(--space-4);
}

.market-odds {
  display: flex;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
}

.odds-bar {
  flex: 1;
  height: 8px;
  background: var(--bg-tertiary);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.odds-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--color-success), var(--color-success));
  border-radius: var(--radius-full);
  transition: width var(--transition-slow);
}

.odds-labels {
  display: flex;
  justify-content: space-between;
  font-size: var(--text-sm);
}

.odds-yes {
  color: var(--color-success);
  font-weight: var(--font-semibold);
  font-family: var(--font-mono);
}

.odds-no {
  color: var(--color-danger);
  font-weight: var(--font-semibold);
  font-family: var(--font-mono);
}

.market-actions {
  display: flex;
  gap: var(--space-3);
  margin-top: var(--space-4);
}

/* --------------------------------------------------------------------------
   Buttons
   -------------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-5);
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
  white-space: nowrap;
}

.btn:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

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

.btn-primary {
  background: var(--color-primary);
  color: var(--bg-primary);
}

.btn-primary:hover:not(:disabled) {
  background: var(--color-primary-hover);
  box-shadow: var(--shadow-glow);
}

.btn-success {
  background: var(--color-success);
  color: white;
  flex: 1;
}

.btn-success:hover:not(:disabled) {
  background: #16A34A;
}

.btn-danger {
  background: var(--color-danger);
  color: white;
  flex: 1;
}

.btn-danger:hover:not(:disabled) {
  background: #DC2626;
}

.btn-secondary {
  background: var(--bg-tertiary);
  color: var(--text-primary);
}

.btn-secondary:hover:not(:disabled) {
  background: var(--bg-hover);
}

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
}

.btn-ghost:hover:not(:disabled) {
  color: var(--text-primary);
  background: var(--bg-hover);
}

.btn-sm {
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-xs);
}

.btn-lg {
  padding: var(--space-4) var(--space-6);
  font-size: var(--text-base);
}

/* --------------------------------------------------------------------------
   Trade Modal
   -------------------------------------------------------------------------- */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.8);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-base);
}

.modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

.modal {
  background: var(--bg-card);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  max-width: 480px;
  width: 90%;
  max-height: 90vh;
  overflow-y: auto;
  transform: scale(0.95);
  transition: transform var(--transition-base);
}

.modal-overlay.active .modal {
  transform: scale(1);
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-5);
}

.modal-title {
  font-size: var(--text-xl);
  font-weight: var(--font-bold);
}

.modal-close {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-tertiary);
  border: none;
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.modal-close:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.trade-type-tabs {
  display: flex;
  background: var(--bg-tertiary);
  border-radius: var(--radius-md);
  padding: var(--space-1);
  margin-bottom: var(--space-5);
}

.trade-tab {
  flex: 1;
  padding: var(--space-3);
  text-align: center;
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
  color: var(--text-secondary);
  background: transparent;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.trade-tab.active {
  background: var(--bg-card);
  color: var(--text-primary);
}

.trade-tab.yes.active {
  color: var(--color-success);
}

.trade-tab.no.active {
  color: var(--color-danger);
}

.form-group {
  margin-bottom: var(--space-5);
}

.form-label {
  display: block;
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  color: var(--text-secondary);
  margin-bottom: var(--space-2);
}

.form-input {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  background: var(--bg-tertiary);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: var(--text-base);
  font-family: var(--font-mono);
  transition: all var(--transition-fast);
}

.form-input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(245, 158, 11, 0.1);
}

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

.quick-amounts {
  display: flex;
  gap: var(--space-2);
  margin-top: var(--space-2);
}

.quick-amount {
  flex: 1;
  padding: var(--space-2);
  background: var(--bg-tertiary);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-size: var(--text-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.quick-amount:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.trade-summary {
  background: var(--bg-tertiary);
  border-radius: var(--radius-md);
  padding: var(--space-4);
  margin-bottom: var(--space-5);
}

.summary-row {
  display: flex;
  justify-content: space-between;
  font-size: var(--text-sm);
  padding: var(--space-2) 0;
  border-bottom: 1px solid var(--border-default);
}

.summary-row:last-child {
  border-bottom: none;
  font-weight: var(--font-semibold);
  font-size: var(--text-base);
}

.summary-label {
  color: var(--text-secondary);
}

.summary-value {
  color: var(--text-primary);
  font-family: var(--font-mono);
}

/* --------------------------------------------------------------------------
   Positions Table
   -------------------------------------------------------------------------- */
.positions-table {
  width: 100%;
  border-collapse: collapse;
}

.positions-table th {
  text-align: left;
  padding: var(--space-3) var(--space-4);
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  color: var(--text-secondary);
  border-bottom: 1px solid var(--border-default);
}

.positions-table td {
  padding: var(--space-4);
  font-size: var(--text-sm);
  border-bottom: 1px solid var(--border-default);
}

.positions-table tr:hover td {
  background: var(--bg-hover);
}

.position-market {
  font-weight: var(--font-medium);
  color: var(--text-primary);
  max-width: 300px;
}

.position-side {
  display: inline-flex;
  padding: var(--space-1) var(--space-2);
  font-size: var(--text-xs);
  font-weight: var(--font-semibold);
  border-radius: var(--radius-sm);
}

.position-side.yes {
  background: var(--color-success-bg);
  color: var(--color-success);
}

.position-side.no {
  background: var(--color-danger-bg);
  color: var(--color-danger);
}

.position-pnl.positive {
  color: var(--color-success);
}

.position-pnl.negative {
  color: var(--color-danger);
}

/* --------------------------------------------------------------------------
   Empty States
   -------------------------------------------------------------------------- */
.empty-state {
  text-align: center;
  padding: var(--space-12) var(--space-6);
}

.empty-icon {
  font-size: var(--text-4xl);
  margin-bottom: var(--space-4);
}

.empty-title {
  font-size: var(--text-lg);
  font-weight: var(--font-semibold);
  color: var(--text-primary);
  margin-bottom: var(--space-2);
}

.empty-description {
  color: var(--text-secondary);
  margin-bottom: var(--space-6);
}

/* --------------------------------------------------------------------------
   Loading States
   -------------------------------------------------------------------------- */
.skeleton {
  background: linear-gradient(90deg, var(--bg-tertiary) 25%, var(--bg-hover) 50%, var(--bg-tertiary) 75%);
  background-size: 200% 100%;
  animation: skeleton-loading 1.5s infinite;
  border-radius: var(--radius-md);
}

@keyframes skeleton-loading {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

.skeleton-text {
  height: 1em;
  margin-bottom: var(--space-2);
}

.skeleton-title {
  height: 1.5em;
  width: 60%;
  margin-bottom: var(--space-3);
}

.skeleton-card {
  height: 200px;
}

/* --------------------------------------------------------------------------
   Badges
   -------------------------------------------------------------------------- */
.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-1) var(--space-2);
  font-size: var(--text-xs);
  font-weight: var(--font-medium);
  border-radius: var(--radius-full);
}

.badge-live {
  background: rgba(34, 197, 94, 0.1);
  color: var(--color-success);
}

.badge-live::before {
  content: '';
  width: 6px;
  height: 6px;
  background: var(--color-success);
  border-radius: 50%;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

.badge-paper {
  background: rgba(245, 158, 11, 0.1);
  color: var(--color-primary);
}

/* --------------------------------------------------------------------------
   Leaderboard
   -------------------------------------------------------------------------- */
.leaderboard-item {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-4);
  border-bottom: 1px solid var(--border-default);
}

.leaderboard-item:last-child {
  border-bottom: none;
}

.leaderboard-rank {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: var(--font-bold);
  font-size: var(--text-sm);
  border-radius: var(--radius-full);
  background: var(--bg-tertiary);
  color: var(--text-secondary);
}

.leaderboard-rank.gold {
  background: linear-gradient(135deg, #F59E0B, #D97706);
  color: white;
}

.leaderboard-rank.silver {
  background: linear-gradient(135deg, #94A3B8, #64748B);
  color: white;
}

.leaderboard-rank.bronze {
  background: linear-gradient(135deg, #B45309, #92400E);
  color: white;
}

.leaderboard-user {
  flex: 1;
}

.leaderboard-name {
  font-weight: var(--font-semibold);
  color: var(--text-primary);
}

.leaderboard-stats {
  font-size: var(--text-sm);
  color: var(--text-secondary);
}

.leaderboard-roi {
  font-family: var(--font-mono);
  font-weight: var(--font-semibold);
}

.leaderboard-roi.positive {
  color: var(--color-success);
}

/* --------------------------------------------------------------------------
   Toast Notifications
   -------------------------------------------------------------------------- */
.toast-container {
  position: fixed;
  bottom: var(--space-6);
  right: var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  z-index: 2000;
}

.toast {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-5);
  background: var(--bg-card);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  animation: toast-in 0.3s ease;
}

@keyframes toast-in {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

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

.toast-icon {
  font-size: var(--text-lg);
}

.toast-message {
  font-size: var(--text-sm);
  color: var(--text-primary);
}

/* --------------------------------------------------------------------------
   Utilities
   -------------------------------------------------------------------------- */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.text-center { text-align: center; }
.text-right { text-align: right; }

.mt-4 { margin-top: var(--space-4); }
.mt-6 { margin-top: var(--space-6); }
.mb-4 { margin-bottom: var(--space-4); }
.mb-6 { margin-bottom: var(--space-6); }

.flex { display: flex; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-2 { gap: var(--space-2); }
.gap-4 { gap: var(--space-4); }

/* Focus visible for accessibility */
:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}