/* ============================================
   F1 PREDICTION LEAGUE — LAYOUT
   Shell · Grid · Nav · Panels · Breakpoints
   ============================================ */

/* --- App Shell --- */
.app {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  background: var(--bg-base);
}

.app-header {
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  background: rgba(10, 10, 10, 0.85);
  backdrop-filter: var(--blur);
  -webkit-backdrop-filter: var(--blur);
  border-bottom: 1px solid var(--glass-border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1280px;
  margin: 0 auto;
  padding: var(--space-3) var(--space-6);
  height: 56px;
}

.header-brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.header-logo {
  font-family: var(--font-display);
  font-weight: var(--weight-extrabold);
  font-size: var(--text-lg);
  color: var(--text-primary);
  letter-spacing: -0.02em;
  text-transform: uppercase;
}

.header-logo .accent {
  color: var(--accent);
}

.header-nav {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.nav-item {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  color: var(--text-muted);
  transition: all var(--transition-fast);
  cursor: pointer;
  border: none;
  background: none;
  white-space: nowrap;
}

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

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

.nav-item.active::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 50%;
  transform: translateX(-50%);
  width: 16px;
  height: 2px;
  background: var(--accent);
  border-radius: var(--radius-full);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.header-user {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  color: var(--text-muted);
}

/* --- Main Content --- */
.app-main {
  flex: 1;
  max-width: 1280px;
  width: 100%;
  margin: 0 auto;
  padding: var(--space-6);
}

.page {
  display: none;
  width: 100%;
}

.page.active {
  display: block;
  animation: fadeIn var(--transition-slow) ease forwards;
}

.page-header {
  margin-bottom: var(--space-8);
}

.page-title {
  font-family: var(--font-display);
  font-weight: var(--weight-bold);
  font-size: var(--text-2xl);
  color: var(--text-primary);
  margin-bottom: var(--space-2);
}

.page-subtitle {
  font-size: var(--text-base);
  color: var(--text-muted);
}

/* --- Dashboard Grid (2×2) --- */
.dashboard-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-5);
  margin-bottom: var(--space-6);
}

/* --- Race List --- */
.race-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.race-row-body {
  padding: var(--space-3) var(--space-5);
}

@media (max-width: 480px) {
  .race-row-body {
    padding: var(--space-3);
  }
}

/* --- Prediction Builder: Two Panels --- */
.prediction-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-6);
  min-height: calc(100vh - 200px);
}

.panel {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: var(--space-3);
  border-bottom: 1px solid var(--glass-border);
  margin-bottom: var(--space-2);
}

.panel-title {
  font-family: var(--font-display);
  font-weight: var(--weight-semibold);
  font-size: var(--text-md);
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.panel-count {
  font-family: var(--font-data);
  font-size: var(--text-sm);
  color: var(--text-muted);
}

.order-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  overflow-y: auto;
  max-height: calc(100vh - 280px);
  padding-right: var(--space-2);
}

.driver-pool {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(110px, 1fr));
  gap: var(--space-2);
  align-content: start;
  overflow-y: auto;
  max-height: calc(100vh - 280px);
  padding-right: var(--space-2);
}

.driver-pool .driver-card {
  height: auto;
  aspect-ratio: 1;
  flex-direction: column;
  padding: var(--space-3);
  justify-content: center;
  gap: var(--space-2);
  position: relative;
}

.driver-pool .driver-card-color-bar {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  width: 100%;
  height: 4px;
  border-radius: var(--radius-md) var(--radius-md) 0 0;
}

.driver-pool .driver-card-number {
  position: absolute;
  top: 6px;
  right: 6px;
  width: 24px;
  height: 24px;
  font-size: 10px;
  background: transparent;
}

.driver-pool .driver-card-info {
  align-items: center;
}

.driver-pool .driver-card-team {
  display: none;
}

/* --- Session Tabs --- */
.session-tabs {
  display: flex;
  gap: var(--space-1);
  padding: var(--space-2) 0;
  border-bottom: 1px solid var(--glass-border);
  margin-bottom: var(--space-5);
  overflow-x: auto;
}

.session-tab {
  position: relative;
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  font-family: var(--font-display);
  font-weight: var(--weight-semibold);
  font-size: var(--text-sm);
  color: var(--text-muted);
  background: none;
  border: none;
  cursor: pointer;
  transition: color var(--transition-fast);
  white-space: nowrap;
  border-radius: var(--radius-md) var(--radius-md) 0 0;
}

.session-tab:hover {
  color: var(--text-secondary);
  background: var(--glass-bg);
}

.session-tab.active {
  color: var(--text-primary);
}

.session-tab.active::after {
  content: '';
  position: absolute;
  bottom: -1px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--accent);
}

.session-tab .tab-score {
  font-family: var(--font-data);
  font-size: var(--text-xs);
  color: var(--accent);
}

.session-tab .tab-lock {
  font-size: var(--text-sm);
}

/* --- Side Panel (Slide-in) --- */
.side-panel-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: var(--z-overlay);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-base);
}

.side-panel-overlay.open {
  opacity: 1;
  pointer-events: auto;
}

.side-panel {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  width: 420px;
  max-width: 90vw;
  background: var(--bg-surface);
  border-left: 1px solid var(--glass-border);
  z-index: var(--z-overlay);
  transform: translateX(100%);
  transition: transform var(--transition-slow);
  overflow-y: auto;
  display: flex;
  flex-direction: column;
}

.side-panel.open {
  transform: translateX(0);
}

.side-panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-5);
  border-bottom: 1px solid var(--glass-border);
}

.side-panel-body {
  padding: var(--space-5);
  flex: 1;
}

.side-panel-footer {
  padding: var(--space-5);
  border-top: 1px solid var(--glass-border);
  display: flex;
  gap: var(--space-3);
}

/* --- Auth Layout --- */
.auth-layout {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: var(--space-6);
}

.auth-card {
  width: 100%;
  max-width: 400px;
}

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

/* --- Leaderboard Table --- */
.leaderboard-table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0 var(--space-1);
  min-width: 600px; /* Ensure table doesn't squash too much */
}

.leaderboard-row {
  transition: transform 600ms ease, background-color 1s ease;
}

.leaderboard-row td {
  padding: var(--space-4) var(--space-5);
  background: var(--glass-bg);
  border-top: 1px solid var(--glass-border);
  border-bottom: 1px solid var(--glass-border);
}

.leaderboard-row td:first-child {
  border-left: 1px solid var(--glass-border);
  border-radius: var(--radius-md) 0 0 var(--radius-md);
}

.leaderboard-row td:last-child {
  border-right: 1px solid var(--glass-border);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

.leaderboard-row.leader td {
  border-left: 4px solid var(--gold);
}

.leaderboard-row.leader td:first-child {
  border-left: 4px solid var(--gold);
}

/* --- Confirm Bar --- */
.confirm-bar {
  position: sticky;
  bottom: 0;
  background: rgba(10, 10, 10, 0.95);
  backdrop-filter: var(--blur);
  border-top: 1px solid var(--glass-border);
  padding: var(--space-4) var(--space-6);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  z-index: var(--z-sticky);
  padding-bottom: calc(var(--space-4) + env(safe-area-inset-bottom, 0px));
}

.confirm-bar-message {
  font-size: var(--text-sm);
  color: var(--text-muted);
  font-style: italic;
  flex: 1;
}

.confirm-bar-actions {
  display: flex;
  gap: var(--space-3);
}

/* --- Score Breakdown --- */
.score-breakdown {
  width: 100%;
  border-collapse: collapse;
}

.score-breakdown th {
  font-family: var(--font-body);
  font-weight: var(--weight-medium);
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  padding: var(--space-3) var(--space-4);
  text-align: left;
  border-bottom: 1px solid var(--glass-border);
}

.score-breakdown td {
  font-family: var(--font-data);
  font-size: var(--text-sm);
  padding: var(--space-2) var(--space-4);
  border-bottom: 1px solid rgba(255, 255, 255, 0.03);
}

.score-breakdown tr.bonus-row td {
  color: var(--accent);
  font-weight: var(--weight-semibold);
  border-top: 1px solid var(--glass-border);
}

/* --- FAB (Floating Action Button) --- */
.fab {
  position: fixed;
  bottom: var(--space-8);
  right: var(--space-8);
  z-index: var(--z-dropdown);
}

/* ============================================
   RESPONSIVE BREAKPOINTS
   ============================================ */

/* --- Tablet (768px) --- */
@media (max-width: 768px) {
  .header-inner {
    padding: var(--space-3) var(--space-4);
  }

  .header-brand {
    gap: var(--space-2);
  }

  .header-logo {
    font-size: var(--text-base);
  }

  .header-actions {
    gap: var(--space-2);
  }

  .header-user {
    font-size: var(--text-xs);
  }

  .header-nav {
    display: none;
  }

  .header-nav.mobile-open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 56px;
    left: 0;
    right: 0;
    background: rgba(15, 15, 15, 0.95);
    backdrop-filter: var(--blur);
    -webkit-backdrop-filter: var(--blur);
    border-bottom: 1px solid var(--glass-border);
    padding: var(--space-3);
    gap: var(--space-1);
    z-index: var(--z-dropdown);
  }

  .mobile-menu-btn {
    display: flex;
  }

  .app-main {
    padding: var(--space-4);
  }

  .dashboard-grid {
    grid-template-columns: 1fr;
    gap: var(--space-4);
  }

  .prediction-layout {
    grid-template-columns: 1fr;
    gap: var(--space-4);
  }

  .side-panel {
    width: 100vw;
    max-width: 100vw;
    padding-bottom: env(safe-area-inset-bottom, 0px);
  }

  .confirm-bar {
    flex-direction: column;
    text-align: center;
    padding: var(--space-4);
    padding-bottom: calc(var(--space-4) + env(safe-area-inset-bottom, 0px));
  }
  
  .confirm-bar-actions {
    width: 100%;
    justify-content: center;
  }

  .leaderboard-table {
    font-size: var(--text-sm);
  }

  .fab {
    bottom: var(--space-6);
    right: var(--space-6);
  }
}

/* --- Mobile (480px) --- */
@media (max-width: 480px) {
  .app-main {
    padding: var(--space-3) 0;
  }

  .page {
    padding: 0 var(--space-3);
  }

  .page-title {
    font-size: var(--text-xl);
  }

  .session-tabs {
    padding: var(--space-2) 0;
    gap: 0;
  }

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

  /* Remove max-height constraints on mobile to allow natural page scrolling */
  .order-list,
  .driver-pool {
    max-height: none;
    overflow-y: visible;
  }

  .score-breakdown th,
  .score-breakdown td {
    padding: var(--space-2) var(--space-3);
    font-size: var(--text-xs);
  }
  
  .fab {
    bottom: calc(var(--space-4) + env(safe-area-inset-bottom, 0px));
    right: var(--space-4);
  }
}

/* --- Large Desktop (1024px+) --- */
@media (min-width: 1024px) {
  .mobile-menu-btn {
    display: none;
  }
}

/* --- Hidden Utilities --- */
.hidden {
  display: none !important;
}

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