/* ===== CSS Variables & Design System ===== */
:root {
  /* Colors */
  --bg-primary: #FFFFFF;
  --bg-secondary: #F9FAFB;
  --bg-card: #FFFFFF;

  --text-primary: #000000;
  --text-secondary: #6B7280;
  --text-muted: #9CA3AF;

  --border-color: #E5E7EB;
  --border-active: #3B82F6;

  /* Spacing - Reduced */
  --space-xs: 0.375rem;
  --space-sm: 0.75rem;
  --space-md: 1rem;
  --space-lg: 1.25rem;
  --space-xl: 1.5rem;

  /* Border Radius - More Angular */
  --radius-sm: 0.25rem;
  --radius-md: 0.375rem;
  --radius-lg: 0.5rem;
  --radius-xl: 0.625rem;

  /* Typography */
  --font-body: 'Outfit', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-heading: 'Space Grotesk', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

  /* Transitions */
  --transition: 200ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* Dark Mode */
[data-theme="dark"] {
  --bg-primary: #0F172A;
  --bg-secondary: #1E293B;
  --bg-card: #1E293B;

  --text-primary: #F1F5F9;
  --text-secondary: #94A3B8;
  --text-muted: #64748B;

  --border-color: #334155;
  --border-active: #3B82F6;
}

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

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

body {
  font-family: var(--font-body);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  margin: 0;
  padding: 0;
  overflow-x: hidden;
  transition: background-color var(--transition), color var(--transition);
}

/* ===== Typography ===== */
.main-title {
  font-family: var(--font-heading);
  font-size: 2rem;
  font-weight: 900;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  margin: 0;
}

.subtitle {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin: 0.25rem 0 0 0;
}

.section-label {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: var(--space-sm);
}

/* ===== Layout ===== */
.container {
  max-width: 600px;
  margin: 0 auto;
  padding: var(--space-md);
  overflow-x: hidden;
}

header {
  padding: var(--space-md) 0 var(--space-sm) 0;
  border-bottom: 1px solid var(--border-color);
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
}

.header-actions {
  display: flex;
  gap: var(--space-xs);
}

/* ===== Buttons ===== */
.btn-icon-header,
.btn-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  background: var(--bg-card);
  color: var(--text-primary);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition);
}

.btn-icon-header:hover,
.btn-icon:hover {
  background: var(--bg-secondary);
  border-color: var(--text-secondary);
}

.btn-text {
  background: transparent;
  border: none;
  color: var(--text-primary);
  cursor: pointer;
  padding: var(--space-xs);
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  transition: opacity var(--transition);
}

.btn-text:hover {
  opacity: 0.7;
}

.btn-cta {
  width: 100%;
  padding: 1.125rem var(--space-lg);
  background: var(--text-primary);
  color: var(--bg-primary);
  border: none;
  border-radius: var(--radius-md);
  font-family: var(--font-heading);
  font-size: 0.875rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  transition: all var(--transition);
  margin-top: var(--space-lg);
}

.btn-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 16px rgba(0, 0, 0, 0.15);
}

.btn-cta:active {
  transform: translateY(0);
}

.btn-save {
  width: 100%;
  padding: 1rem var(--space-lg);
  background: var(--text-primary);
  color: var(--bg-primary);
  border: none;
  border-radius: var(--radius-md);
  font-family: var(--font-heading);
  font-size: 0.875rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  transition: all var(--transition);
  margin-top: var(--space-lg);
}

.btn-save:hover {
  opacity: 0.9;
}

/* ===== Icons ===== */
.icon {
  width: 20px;
  height: 20px;
  stroke: currentColor;
  fill: none;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

/* ===== Card Carousel ===== */
.card-selector-section {
  margin-top: var(--space-md);
}

.card-carousel {
  display: flex;
  gap: var(--space-sm);
  overflow-x: auto;
  padding-bottom: var(--space-xs);
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}

.card-carousel::-webkit-scrollbar {
  display: none;
}

.credit-card {
  min-width: 220px;
  padding: var(--space-sm) var(--space-md);
  border: 2px solid var(--border-color);
  border-radius: var(--radius-md);
  background: var(--bg-card);
  cursor: pointer;
  transition: all var(--transition);
  position: relative;
}

.credit-card.selected {
  border-color: var(--card-color, var(--border-active));
  background: var(--bg-secondary);
}

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

.add-card-btn {
  min-width: 220px;
  padding: var(--space-sm) var(--space-md);
  border: 2px dashed var(--border-color);
  border-radius: var(--radius-md);
  background: transparent;
  cursor: pointer;
  transition: all var(--transition);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  color: var(--text-muted);
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.8125rem;
}

.add-card-btn:hover {
  border-color: var(--border-active);
  background: var(--bg-secondary);
  color: var(--text-primary);
}

.add-card-btn .icon {
  width: 20px;
  height: 20px;
}

.card-icon {
  width: 32px;
  height: 24px;
  border: 2px solid var(--border-color);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-xs);
  background: var(--bg-primary);
}

.card-icon svg {
  width: 20px;
  height: 20px;
  stroke: var(--text-secondary);
}

.card-earn-rate {
  text-align: right;
  margin-bottom: var(--space-xs);
}

.earn-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.earn-value {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  font-family: var(--font-heading);
}

.earn-detail {
  font-size: 0.75rem;
  color: var(--text-secondary);
}

.card-bank {
  font-size: 0.75rem;
  color: var(--text-secondary);
  margin-bottom: 0.25rem;
}

.card-name {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
  font-family: var(--font-heading);
}

/* ===== Calculator Section ===== */
.calculator-section {
  margin-top: var(--space-lg);
}

.price-input-wrapper {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-md);
  border: 2px solid var(--border-color);
  border-radius: var(--radius-md);
  background: var(--bg-card);
  transition: border-color var(--transition);
}

.price-input-wrapper:focus-within {
  border-color: var(--border-active);
}

.currency-symbol {
  font-size: 2.5rem;
  font-weight: 300;
  color: var(--text-muted);
  font-family: var(--font-heading);
}

.price-input {
  flex: 1;
  font-size: 3rem;
  font-weight: 300;
  font-family: var(--font-heading);
  border: none;
  background: transparent;
  color: var(--text-primary);
  outline: none;
}

.price-input::placeholder {
  color: var(--text-muted);
  opacity: 0.5;
}

/* Remove number input spinners */
.price-input::-webkit-outer-spin-button,
.price-input::-webkit-inner-spin-button {
  -webkit-appearance: none;
  appearance: none;
  margin: 0;
}

.price-input[type=number] {
  -moz-appearance: textfield;
  appearance: textfield;
}

/* ===== Multiplier Section ===== */
.multiplier-section {
  margin-top: var(--space-md);
}

.multiplier-buttons {
  display: grid;
  grid-template-columns: repeat(4, 1fr) 1.5fr;
  gap: var(--space-xs);
}

.multiplier-btn {
  padding: var(--space-sm);
  border: 2px solid var(--border-color);
  border-radius: var(--radius-md);
  background: var(--bg-card);
  color: var(--text-secondary);
  font-family: var(--font-heading);
  font-size: 0.875rem;
  font-weight: 700;
  cursor: pointer;
  transition: all var(--transition);
}

.multiplier-btn:hover {
  border-color: var(--border-active);
  background: var(--bg-secondary);
}

.multiplier-btn.active {
  border-color: var(--border-active);
  background: var(--border-active);
  color: white;
}

.custom-multiplier {
  position: relative;
  display: flex;
  align-items: center;
}

.custom-multiplier-input {
  width: 100%;
  padding: var(--space-sm) var(--space-md);
  padding-right: 2rem;
  border: 2px solid var(--border-color);
  border-radius: var(--radius-md);
  background: var(--bg-card);
  color: var(--text-primary);
  font-family: var(--font-heading);
  font-size: 0.875rem;
  font-weight: 700;
  text-align: left;
  outline: none;
  transition: all var(--transition);
}

.custom-multiplier-input:focus {
  border-color: var(--border-active);
  background: var(--bg-secondary);
}

.custom-multiplier-input.active {
  border-color: var(--border-active);
  background: var(--border-active);
  color: white;
}

.custom-multiplier-input.active::placeholder {
  color: rgba(255, 255, 255, 0.7);
}

.custom-multiplier-input::placeholder {
  color: var(--text-muted);
  font-weight: 600;
}

.multiplier-suffix {
  position: absolute;
  right: var(--space-md);
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  font-family: var(--font-heading);
  font-size: 0.75rem;
  font-weight: 600;
  pointer-events: none;
  transition: all var(--transition);
}

.custom-multiplier-input.active+.multiplier-suffix {
  color: rgba(255, 255, 255, 0.8);
}

.custom-multiplier-input:focus+.multiplier-suffix {
  opacity: 0.3;
}

/* ===== Results Section ===== */
.results-section {
  margin-top: var(--space-lg);
  animation: slideUp 0.3s ease-out;
}

@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.results-card {
  padding: var(--space-md);
  border: 2px solid var(--border-color);
  border-radius: var(--radius-md);
  background: var(--bg-card);
}

.results-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: var(--space-md);
  font-family: var(--font-heading);
}

.result-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-sm) 0;
  border-bottom: 1px solid var(--border-color);
}

.result-row:last-child {
  border-bottom: none;
}

.result-label {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.result-value {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--text-primary);
  font-family: var(--font-heading);
}

.result-value.highlight {
  color: #3B82F6;
  font-size: 1.5rem;
}

.result-value.success {
  color: #10B981;
}

.perfect-badge {
  margin-top: var(--space-md);
  padding: var(--space-md);
  background: #DCFCE7;
  border-radius: var(--radius-md);
  text-align: center;
}

[data-theme="dark"] .perfect-badge {
  background: rgba(16, 185, 129, 0.1);
}

.perfect-badge strong {
  color: #10B981;
  font-size: 1rem;
}

/* ===== Modal ===== */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: var(--space-md);
  animation: fadeIn 0.2s ease-out;
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }

  to {
    opacity: 1;
  }
}

.modal {
  background: var(--bg-primary);
  border-radius: var(--radius-xl);
  max-width: 500px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  animation: slideUpModal 0.3s ease-out;
}

@keyframes slideUpModal {
  from {
    opacity: 0;
    transform: translateY(40px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.modal-large {
  max-width: 600px;
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-lg);
  border-bottom: 1px solid var(--border-color);
  gap: var(--space-md);
}

.modal-title {
  font-size: 1.5rem;
  font-weight: 700;
  font-family: var(--font-heading);
  margin: 0;
}

.modal-subtitle {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin: 0.25rem 0 0 0;
}

.modal-body {
  padding: var(--space-lg);
}

/* ===== Card Form ===== */
.card-form-section {
  margin-bottom: var(--space-xl);
  padding-bottom: var(--space-xl);
  border-bottom: 1px solid var(--border-color);
}

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

.form-header h3 {
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  font-family: var(--font-heading);
}

.form-row {
  margin-bottom: var(--space-md);
}

.form-row-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-md);
}

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

.form-group label {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: var(--space-xs);
}

.form-group input {
  padding: 0.875rem var(--space-md);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  background: var(--bg-card);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 1rem;
  transition: border-color var(--transition);
  outline: none;
}

.form-group input:focus {
  border-color: var(--border-active);
}

/* ===== Color Grid ===== */
.color-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: var(--space-sm);
}

.color-btn {
  aspect-ratio: 1;
  border-radius: var(--radius-md);
  border: 3px solid transparent;
  cursor: pointer;
  transition: all var(--transition);
  position: relative;
}

.color-btn:hover {
  transform: scale(1.05);
}

.color-btn.selected {
  border-color: var(--text-primary);
}

.color-btn.selected::after {
  content: '✓';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  color: white;
  font-weight: bold;
  font-size: 1.25rem;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
}

/* ===== Cards List ===== */
.cards-list-section {
  min-height: 200px;
}

.empty-message {
  text-align: center;
  color: var(--text-muted);
  font-size: 0.875rem;
  padding: var(--space-xl) 0;
}

.card-item {
  padding: var(--space-md);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-sm);
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: all var(--transition);
}

.card-item:hover {
  background: var(--bg-secondary);
}

.card-item-info h4 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
  font-family: var(--font-heading);
}

.card-item-info p {
  font-size: 0.75rem;
  color: var(--text-secondary);
}

.card-item-actions {
  display: flex;
  gap: var(--space-xs);
}

/* ===== Footer ===== */
footer {
  text-align: center;
  padding: var(--space-xl) var(--space-md);
  color: var(--text-muted);
  font-size: 0.875rem;
}

/* ===== Utility ===== */
.hidden {
  display: none !important;
}

/* ===== Responsive ===== */
@media (max-width: 640px) {
  .main-title {
    font-size: 1.75rem;
  }

  .price-input {
    font-size: 2.5rem;
  }

  .currency-symbol {
    font-size: 2rem;
  }

  .credit-card {
    min-width: 260px;
  }

  .form-row-2 {
    grid-template-columns: 1fr;
  }

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