/* Bridge Trainer — Main Styles (Mobile-First PWA) */

:root {
  /* Colors */
  --bg-primary: #0f1923;
  --bg-secondary: #1a2733;
  --bg-card: #243442;
  --bg-surface: #2a3f50;
  --text-primary: #e8edf2;
  --text-secondary: #8899a6;
  --text-muted: #5b7083;
  --accent: #1d9bf0;
  --accent-hover: #1a8cd8;
  --success: #00c853;
  --error: #ff5252;
  --warning: #ffc107;
  --border: #38444d;

  /* Suit colors */
  --suit-spades: #5c9aff;
  --suit-hearts: #ff5555;
  --suit-diamonds: #ffaa33;
  --suit-clubs: #55cc77;

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

  /* Radius */
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 16px;

  /* Font */
  --font-main: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'SF Mono', 'Fira Code', monospace;

  /* Sizes */
  --tab-height: 64px;
  --header-height: 56px;
  --safe-bottom: env(safe-area-inset-bottom, 0px);
}

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

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-main);
  background: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  min-height: 100dvh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

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

/* Header */
.app-header {
  height: var(--header-height);
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  padding: 0 var(--spacing-md);
  position: sticky;
  top: 0;
  z-index: 100;
}

.app-header h1 {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-primary);
}

.app-header .subtitle {
  font-size: 12px;
  color: var(--text-secondary);
  margin-left: var(--spacing-sm);
}

/* Main Content */
.app-content {
  flex: 1;
  padding: var(--spacing-md);
  padding-bottom: calc(var(--tab-height) + var(--safe-bottom) + var(--spacing-md));
  overflow-y: auto;
  max-width: 600px;
  margin: 0 auto;
  width: 100%;
}

/* Tab Bar (bottom, mobile-style) */
.tab-bar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: calc(var(--tab-height) + var(--safe-bottom));
  padding-bottom: var(--safe-bottom);
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  display: flex;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
  z-index: 100;
}

.tab-bar::-webkit-scrollbar { display: none; }

.tab-item {
  flex: 0 0 auto;
  min-width: 72px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-xs) var(--spacing-sm);
  color: var(--text-muted);
  text-decoration: none;
  font-size: 10px;
  gap: 2px;
  cursor: pointer;
  transition: color 0.2s;
  -webkit-tap-highlight-color: transparent;
  user-select: none;
}

.tab-item .tab-icon {
  font-size: 22px;
  line-height: 1;
}

.tab-item .tab-label {
  white-space: nowrap;
  font-weight: 500;
}

.tab-item.active {
  color: var(--accent);
}

.tab-item:active {
  opacity: 0.7;
}

/* Module Container */
.module-container {
  animation: fadeIn 0.2s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Cards */
.card-area {
  background: var(--bg-surface);
  border-radius: var(--radius-lg);
  padding: var(--spacing-md);
  margin-bottom: var(--spacing-md);
}

.card-area-title {
  font-size: 13px;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-sm);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 24px;
  border: none;
  border-radius: var(--radius-md);
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  -webkit-tap-highlight-color: transparent;
  user-select: none;
  min-height: 48px;
}

.btn-primary {
  background: var(--accent);
  color: white;
}
.btn-primary:active { background: var(--accent-hover); transform: scale(0.97); }

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

.btn-error {
  background: var(--error);
  color: white;
}

.btn-outline {
  background: transparent;
  color: var(--text-primary);
  border: 2px solid var(--border);
}
.btn-outline:active { background: var(--bg-surface); }

.btn-block {
  display: flex;
  width: 100%;
}

.btn-sm {
  padding: 8px 16px;
  font-size: 14px;
  min-height: 40px;
}

.btn-lg {
  padding: 16px 32px;
  font-size: 18px;
  min-height: 56px;
}

/* Bid buttons */
.bid-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--spacing-sm);
  margin: var(--spacing-md) 0;
}

.bid-btn {
  padding: 12px 8px;
  border: 2px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg-card);
  color: var(--text-primary);
  font-size: 15px;
  font-weight: 600;
  text-align: center;
  cursor: pointer;
  transition: all 0.15s;
  min-height: 48px;
}

.bid-btn:active { transform: scale(0.95); }
.bid-btn.selected { border-color: var(--accent); background: rgba(29, 155, 240, 0.15); }
.bid-btn.correct { border-color: var(--success); background: rgba(0, 200, 83, 0.15); }
.bid-btn.wrong { border-color: var(--error); background: rgba(255, 82, 82, 0.15); }

/* Input */
.input-field {
  width: 100%;
  padding: 10px 14px;
  background: var(--bg-card);
  border: 2px solid var(--border);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 22px;
  font-weight: 700;
  text-align: center;
  outline: none;
  transition: border-color 0.2s;
}

.input-field:focus {
  border-color: var(--accent);
}

.input-field.correct { border-color: var(--success); }
.input-field.wrong { border-color: var(--error); }

/* Feedback */
.feedback {
  padding: var(--spacing-md);
  border-radius: var(--radius-md);
  margin: var(--spacing-md) 0;
  font-size: 15px;
  line-height: 1.5;
}

.feedback-success {
  background: rgba(0, 200, 83, 0.1);
  border: 1px solid rgba(0, 200, 83, 0.3);
  color: var(--success);
}

.feedback-error {
  background: rgba(255, 82, 82, 0.1);
  border: 1px solid rgba(255, 82, 82, 0.3);
  color: var(--error);
}

.feedback-info {
  background: rgba(29, 155, 240, 0.1);
  border: 1px solid rgba(29, 155, 240, 0.3);
  color: var(--accent);
}

/* Stats bar */
.stats-bar {
  display: flex;
  gap: var(--spacing-md);
  padding: var(--spacing-xs) 0;
  margin-bottom: var(--spacing-sm);
}

.stat-item {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.stat-value {
  font-size: 20px;
  font-weight: 700;
  color: var(--text-primary);
}

.stat-label {
  font-size: 10px;
  color: var(--text-secondary);
  text-transform: uppercase;
}

/* Timer */
.timer {
  font-size: 48px;
  font-weight: 700;
  text-align: center;
  font-family: var(--font-mono);
  color: var(--text-primary);
}

.timer.warning { color: var(--warning); }
.timer.danger { color: var(--error); }

/* Explanation block */
.explanation {
  background: var(--bg-card);
  border-radius: var(--radius-md);
  padding: var(--spacing-md);
  margin: var(--spacing-md) 0;
  border-left: 4px solid var(--accent);
}

.explanation h3 {
  font-size: 14px;
  color: var(--accent);
  margin-bottom: var(--spacing-sm);
}

.explanation p {
  font-size: 14px;
  line-height: 1.6;
  color: var(--text-secondary);
}

.explanation .lesson-ref {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: var(--spacing-sm);
}

/* Responsive: wider screens */
@media (min-width: 768px) {
  .app-content {
    max-width: 720px;
    padding: var(--spacing-lg);
  }

  .tab-bar {
    justify-content: center;
  }

  .tab-item {
    min-width: 80px;
  }

  .bid-grid {
    grid-template-columns: repeat(5, 1fr);
  }
}

/* Utility */
.text-center { text-align: center; }
.text-muted { color: var(--text-secondary); }
.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }
.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.gap-sm { gap: var(--spacing-sm); }
.gap-md { gap: var(--spacing-md); }
.flex { display: flex; }
.flex-col { flex-direction: column; }
.flex-center { align-items: center; justify-content: center; }
.flex-between { justify-content: space-between; }
.flex-wrap { flex-wrap: wrap; }
.w-full { width: 100%; }
.hidden { display: none !important; }

/* Reset browser default styles for tab and popup buttons */
button.tab-item,
button.popup-item {
  background: none;
  border: none;
  font: inherit;
  color: inherit;
  cursor: pointer;
  padding: inherit;
}

/* Streak banner on welcome screen */
.streak-banner {
  text-align: center;
  padding: 12px;
  margin: 8px 16px;
  border-radius: var(--radius-md);
  background: var(--bg-card);
}
.streak-days {
  font-size: 1.3em;
  font-weight: 700;
}
.daily-progress {
  font-size: 0.9em;
  color: var(--text-secondary);
  margin-top: 4px;
}

/* Focus visible styles for keyboard navigation */
.btn:focus-visible,
input:focus-visible,
select:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* Error toast notification */
.error-toast {
  position: fixed;
  bottom: 80px;
  left: 50%;
  transform: translateX(-50%);
  background: #1a1a2e;
  color: #fff;
  padding: 12px 20px;
  border-radius: 8px;
  border-left: 4px solid var(--error, #ff5252);
  font-size: 14px;
  z-index: 10000;
  opacity: 0;
  transition: opacity 0.3s;
  max-width: 90vw;
  pointer-events: none;
}
.error-toast.visible { opacity: 1; }
.error-toast.success { border-left-color: var(--success, #4caf50); }

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}