:root {
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --bg-primary: #f8fafc;
  --bg-surface: #ffffff;
  --bg-surface-secondary: #f1f5f9;
  --bg-surface-tertiary: #e2e8f0;
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #64748b;
  --border-color: #e2e8f0;
  --border-focus: #3b82f6;
  
  --color-primary: #2563eb;
  --color-primary-hover: #1d4ed8;
  --color-success: #16a34a;
  --color-success-bg: #dcfce7;
  --color-warning: #d97706;
  --color-warning-bg: #fef3c7;
  --color-danger: #dc2626;
  --color-danger-bg: #fee2e2;

  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-full: 9999px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg-primary: #0b0f19;
    --bg-surface: #131b2e;
    --bg-surface-secondary: #1e293b;
    --bg-surface-tertiary: #334155;
    --text-primary: #f8fafc;
    --text-secondary: #cbd5e1;
    --text-muted: #94a3b8;
    --border-color: #243049;
    --border-focus: #60a5fa;

    --color-primary: #3b82f6;
    --color-primary-hover: #60a5fa;
    --color-success: #22c55e;
    --color-success-bg: #064e3b;
    --color-warning: #f59e0b;
    --color-warning-bg: #451a03;
    --color-danger: #ef4444;
    --color-danger-bg: #450a0a;

    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.3);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.4);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.5);
  }
}

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: 1024px;
  margin: 0 auto;
  padding: 1.25rem;
}

/* Header */
header.app-header {
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border-color);
  padding: 1rem 0;
  position: sticky;
  top: 0;
  z-index: 40;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1024px;
  margin: 0 auto;
  padding: 0 1.25rem;
}

.brand-title {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.brand-title h1 {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.025em;
  color: var(--text-primary);
}

.brand-badge {
  font-size: 0.75rem;
  padding: 0.15rem 0.5rem;
  border-radius: var(--radius-full);
  background: var(--bg-surface-secondary);
  color: var(--color-primary);
  font-weight: 600;
}

nav.tab-nav {
  display: flex;
  gap: 0.5rem;
  background: var(--bg-surface-secondary);
  padding: 0.25rem;
  border-radius: var(--radius-md);
}

.tab-btn {
  background: transparent;
  border: none;
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-muted);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.15s ease;
}

.tab-btn.active {
  background: var(--bg-surface);
  color: var(--text-primary);
  box-shadow: var(--shadow-sm);
}

/* Main View Tabs */
.view-panel {
  display: none;
  margin-top: 1.5rem;
}

.view-panel.active {
  display: block;
}

/* Recommender Form Card */
.query-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
  margin-bottom: 1.5rem;
}

.section-headline {
  margin-bottom: 1.25rem;
}

.section-headline h2 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
}

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

.query-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
}

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

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.form-group label {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.form-select,
.form-input {
  background: var(--bg-surface-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 0.65rem 0.85rem;
  font-size: 0.9375rem;
  color: var(--text-primary);
  outline: none;
  transition: border-color 0.15s;
}

.form-select:focus,
.form-input:focus {
  border-color: var(--border-focus);
}

/* Quick Pills */
.quick-pills-label {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  margin-top: 1rem;
  margin-bottom: 0.5rem;
}

.quick-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 1rem;
}

.pill-btn {
  background: var(--bg-surface-secondary);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  font-size: 0.8125rem;
  padding: 0.35rem 0.75rem;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all 0.15s ease;
}

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

.pill-btn.active {
  background: var(--color-primary);
  color: #ffffff;
  border-color: var(--color-primary);
}

.quick-amounts {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin-top: 0.4rem;
}

.amt-btn {
  background: transparent;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 0.2rem 0.5rem;
  font-size: 0.75rem;
  color: var(--text-muted);
  cursor: pointer;
}

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

.filter-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border-color);
}

.toggle-label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.875rem;
  color: var(--text-primary);
  cursor: pointer;
}

.wallet-badge-indicator {
  font-size: 0.8125rem;
  color: var(--text-muted);
}

/* Winner Spotlight Card */
.spotlight-card {
  background: linear-gradient(135deg, rgba(37, 99, 235, 0.08) 0%, rgba(59, 130, 246, 0.02) 100%);
  border: 2px solid var(--color-primary);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  margin-bottom: 1.5rem;
  box-shadow: var(--shadow-md);
  position: relative;
  overflow: hidden;
}

.spotlight-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 1rem;
}

.spotlight-badge {
  background: var(--color-primary);
  color: #ffffff;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.25rem 0.6rem;
  border-radius: var(--radius-sm);
  display: inline-block;
  margin-bottom: 0.5rem;
}

.spotlight-card-name {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text-primary);
}

.spotlight-card-issuer {
  font-size: 0.875rem;
  color: var(--text-muted);
}

.spotlight-return-box {
  text-align: right;
}

.spotlight-rate {
  font-size: 2.25rem;
  font-weight: 800;
  color: var(--color-success);
  line-height: 1;
}

.spotlight-rate-label {
  font-size: 0.75rem;
  text-transform: uppercase;
  font-weight: 600;
  color: var(--text-muted);
}

.spotlight-savings {
  margin-top: 0.4rem;
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-primary);
}

.spotlight-explanation {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 0.85rem 1rem;
  margin-top: 1rem;
  font-size: 0.9375rem;
  color: var(--text-primary);
}

.spotlight-perks-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.75rem;
}

.tag {
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-full);
  background: var(--bg-surface-secondary);
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
}

.tag.tag-accent {
  background: var(--color-success-bg);
  color: var(--color-success);
  border-color: transparent;
}

.tag.tag-warning {
  background: var(--color-warning-bg);
  color: var(--color-warning);
  border-color: transparent;
}

.tag.tag-danger {
  background: var(--color-danger-bg);
  color: var(--color-danger);
  border-color: transparent;
}

/* Ranked Cards List */
.ranked-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-bottom: 2rem;
}

.card-item {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: transform 0.1s, box-shadow 0.1s;
}

.card-item:hover {
  box-shadow: var(--shadow-sm);
}

.card-item.is-excluded {
  opacity: 0.6;
  background: var(--bg-surface-secondary);
}

.card-item-left {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.card-rank {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--text-muted);
  min-width: 1.5rem;
}

.card-info h4 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
}

.card-info p {
  font-size: 0.8125rem;
  color: var(--text-muted);
}

.card-item-right {
  text-align: right;
  min-width: 120px;
}

.card-rate-val {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
}

.card-rate-val.high {
  color: var(--color-success);
}

.card-savings-val {
  font-size: 0.875rem;
  color: var(--text-muted);
}

/* Market Comparison Note */
.market-note {
  background: var(--bg-surface-secondary);
  border-left: 4px solid var(--color-primary);
  padding: 0.85rem 1.25rem;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  margin-bottom: 1.5rem;
  font-size: 0.875rem;
}

.market-note strong {
  color: var(--text-primary);
}

/* Wallet Manager View */
.wallet-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 1.25rem;
}

.btn {
  background: var(--color-primary);
  color: #ffffff;
  border: none;
  border-radius: var(--radius-md);
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  transition: background 0.15s;
}

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

.btn-secondary {
  background: var(--bg-surface-secondary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}

.btn-secondary:hover {
  background: var(--bg-surface-tertiary);
}

.btn-danger {
  background: var(--color-danger);
  color: #ffffff;
}

.btn-sm {
  padding: 0.35rem 0.75rem;
  font-size: 0.8125rem;
}

.bank-group {
  margin-bottom: 1.5rem;
}

.bank-group-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.75rem;
  padding-bottom: 0.25rem;
  border-bottom: 1px solid var(--border-color);
}

.wallet-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1rem;
}

.wallet-card-tile {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.1rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all 0.15s ease;
}

.wallet-card-tile.owned {
  border-color: var(--color-primary);
  background: linear-gradient(180deg, var(--bg-surface) 0%, rgba(37, 99, 235, 0.03) 100%);
}

.wallet-tile-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 0.5rem;
  margin-bottom: 0.75rem;
}

.wallet-tile-title h4 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
}

.wallet-tile-network {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.wallet-tile-specs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 0.75rem;
}

.wallet-tile-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 0.75rem;
  border-top: 1px solid var(--border-color);
}

/* Switch styling */
.switch {
  position: relative;
  display: inline-block;
  width: 44px;
  height: 24px;
}

.switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: var(--bg-surface-tertiary);
  transition: .2s;
  border-radius: 24px;
}

.slider:before {
  position: absolute;
  content: "";
  height: 18px;
  width: 18px;
  left: 3px;
  bottom: 3px;
  background-color: white;
  transition: .2s;
  border-radius: 50%;
}

input:checked + .slider {
  background-color: var(--color-primary);
}

input:checked + .slider:before {
  transform: translateX(20px);
}

/* Modal */
.modal-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 50;
  padding: 1rem;
}

.modal-backdrop.open {
  display: flex;
}

.modal-content {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  max-width: 500px;
  width: 100%;
  padding: 1.5rem;
  box-shadow: var(--shadow-lg);
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
}

.modal-header h3 {
  font-size: 1.15rem;
  font-weight: 700;
}

.close-btn {
  background: transparent;
  border: none;
  font-size: 1.25rem;
  cursor: pointer;
  color: var(--text-muted);
}

.modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: 0.5rem;
  margin-top: 1.25rem;
}

/* Footer */
footer.app-footer {
  margin-top: 3rem;
  padding: 1.5rem 0;
  border-top: 1px solid var(--border-color);
  text-align: center;
  font-size: 0.8125rem;
  color: var(--text-muted);
}

.hidden {
  display: none !important;
}

/* ==========================================================================
   Mobile Responsive Optimizations
   ========================================================================== */

/* Safe area insets for mobile notched screens (iOS / Android) */
body {
  padding-top: env(safe-area-inset-top);
  padding-bottom: env(safe-area-inset-bottom);
  padding-left: env(safe-area-inset-left);
  padding-right: env(safe-area-inset-right);
}

@media (max-width: 640px) {
  /* Layout & Container */
  .container {
    padding: 0.85rem 0.75rem;
  }

  /* Header & Navigation */
  header.app-header {
    padding: 0.65rem 0;
  }

  .header-inner {
    flex-direction: column;
    align-items: stretch;
    gap: 0.65rem;
    padding: 0 0.75rem;
  }

  .brand-title {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
  }

  .brand-title h1 {
    font-size: 1.125rem;
  }

  nav.tab-nav {
    display: flex;
    width: 100%;
    padding: 0.2rem;
  }

  .tab-btn {
    flex: 1;
    text-align: center;
    padding: 0.55rem 0.25rem;
    font-size: 0.8125rem;
    min-height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
  }

  /* Query Card & Form Controls */
  .query-card {
    padding: 1rem 0.85rem;
    border-radius: var(--radius-md);
    margin-bottom: 1rem;
  }

  .section-headline h2 {
    font-size: 1.125rem;
  }

  .section-headline p {
    font-size: 0.8125rem;
  }

  /* Horizontal swipeable category chips */
  .quick-pills {
    display: flex;
    flex-wrap: nowrap;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    gap: 0.4rem;
    padding-bottom: 0.5rem;
    margin-bottom: 1rem;
    scrollbar-width: none;
    -ms-overflow-style: none;
  }

  .quick-pills::-webkit-scrollbar {
    display: none;
  }

  .pill-btn {
    flex-shrink: 0;
    white-space: nowrap;
    padding: 0.45rem 0.85rem;
    font-size: 0.8125rem;
    min-height: 38px;
    display: inline-flex;
    align-items: center;
  }

  .query-grid {
    grid-template-columns: 1fr;
    gap: 0.85rem;
  }

  /* Prevent iOS Safari auto-zoom on input focus */
  .form-select,
  .form-input {
    font-size: 16px !important;
    padding: 0.75rem 0.85rem;
    min-height: 46px;
  }

  .quick-amounts {
    gap: 0.4rem;
    margin-top: 0.5rem;
  }

  .amt-btn {
    flex: 1;
    text-align: center;
    padding: 0.4rem 0.25rem;
    font-size: 0.8125rem;
    min-height: 36px;
  }

  .filter-row {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
  }

  /* Winner Spotlight Card */
  .spotlight-card {
    padding: 1.1rem 0.95rem;
    margin-bottom: 1rem;
  }

  .spotlight-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.75rem;
  }

  .spotlight-card-name {
    font-size: 1.15rem;
  }

  .spotlight-return-box {
    text-align: left;
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    width: 100%;
    border-top: 1px dashed var(--border-color);
    padding-top: 0.75rem;
  }

  .spotlight-rate {
    font-size: 1.85rem;
  }

  .spotlight-explanation {
    font-size: 0.875rem;
    padding: 0.75rem;
  }

  /* Ranked Card Comparison */
  .ranked-list {
    gap: 0.5rem;
  }

  .card-item {
    flex-direction: column;
    align-items: stretch;
    padding: 0.85rem;
    gap: 0.65rem;
  }

  .card-item-left {
    align-items: flex-start;
    gap: 0.65rem;
  }

  .card-item-right {
    text-align: left;
    min-width: 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-top: 1px dashed var(--border-color);
    padding-top: 0.5rem;
  }

  .card-rate-val {
    font-size: 1.1rem;
  }

  /* Wallet & Directory Grids */
  .wallet-grid {
    grid-template-columns: 1fr;
    gap: 0.75rem;
  }

  .wallet-card-tile {
    padding: 0.9rem;
  }

  .wallet-toolbar {
    flex-direction: column;
    align-items: stretch;
    gap: 0.75rem;
  }

  .wallet-toolbar > div:last-child {
    display: grid !important;
    grid-template-columns: 1fr 1fr;
    gap: 0.5rem;
    width: 100%;
  }

  .wallet-toolbar > div:last-child #btn-open-custom-card-modal {
    grid-column: 1 / -1;
  }

  #directory-search-input {
    width: 100% !important;
    min-width: 0 !important;
  }

  /* Bottom Sheet Modal on Mobile */
  .modal-backdrop {
    padding: 0;
    align-items: flex-end;
  }

  .modal-content {
    max-height: 85vh;
    overflow-y: auto;
    padding: 1.25rem 1rem;
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
    width: 100%;
    max-width: 100%;
  }

  .modal-footer {
    flex-direction: column;
    gap: 0.5rem;
  }

  .modal-footer .btn {
    width: 100%;
    justify-content: center;
  }
}