/* ============================================
   FINANCE MINIMAL DESIGN SYSTEM
   Hire-Purchase Calculator Redesign
   ============================================ */

/* ---------- CSS Variables ---------- */
:root {
  /* Finance Minimal Color Palette */
  --fin-bg: #F8FAFC;
  --fin-card: #FFFFFF;
  --fin-primary: #1E40AF;
  --fin-primary-light: #3B82F6;
  --fin-secondary: #64748B;
  --fin-accent-green: #059669;
  --fin-accent-green-light: #10B981;
  --fin-accent-red: #DC2626;
  --fin-accent-amber: #D97706;
  --fin-text: #1E293B;
  --fin-text-muted: #64748B;
  --fin-text-light: #475569;
  --fin-border: #E2E8F0;
  --fin-border-focus: #3B82F6;
  --fin-shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --fin-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -1px rgba(0, 0, 0, 0.04);
  --fin-shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -2px rgba(0, 0, 0, 0.04);
  --fin-radius: 12px;
  --fin-radius-sm: 8px;
  --fin-radius-xs: 6px;
  --fin-transition: 0.2s ease;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  color: var(--fin-text);
  line-height: 1.6;
  min-height: 100vh;
  padding: 32px 16px 60px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  background-color: var(--fin-bg);
  user-select: none;
}

input, textarea, select, .allow-select {
  user-select: text;
  -webkit-user-select: text;
}

.app-container {
  max-width: 860px;
  margin: 0 auto;
}

/* ---------- Header ---------- */
.app-header {
  text-align: center;
  margin-bottom: 40px;
  position: relative;
}

.app-header .icon-wrap {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 56px;
  background: linear-gradient(135deg, var(--fin-primary) 0%, var(--fin-primary-light) 100%);
  border-radius: 14px;
  margin-bottom: 16px;
  box-shadow: var(--fin-shadow);
}

.app-header .icon-wrap svg {
  width: 32px;
  height: 32px;
  fill: #fff;
}

.app-header h1 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--fin-text);
  letter-spacing: -0.3px;
  position: relative;
  display: inline-block;
}

.app-header .subtitle {
  font-size: 0.9rem;
  color: var(--fin-text-muted);
  margin-top: 8px;
  font-weight: 500;
}

.app-header .disclaimer-text {
  font-size: 0.78rem;
  color: var(--fin-text-light);
  margin-top: 8px;
  max-width: 560px;
  margin-left: auto;
  margin-right: auto;
}

/* ---------- Card ---------- */
.card {
  background: var(--fin-card);
  padding: 28px;
  box-shadow: var(--fin-shadow);
  margin-bottom: 20px;
  border: 1px solid var(--fin-border);
  border-radius: var(--fin-radius);
  transition: box-shadow var(--fin-transition);
}

.card:hover {
  box-shadow: var(--fin-shadow-lg);
}

.card-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--fin-text);
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.card-title .dot {
  width: 8px;
  height: 8px;
  background: var(--fin-primary-light);
  border-radius: 50%;
  flex-shrink: 0;
}

/* ---------- Input Grid ---------- */
.input-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px 24px;
}

@media (max-width: 640px) {
  .input-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }
  .card {
    padding: 20px 16px;
  }
  .app-header h1 {
    font-size: 1.25rem;
  }
}

/* ---------- Form Elements ---------- */
.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form-group.full-width {
  grid-column: 1 / -1;
}

.form-label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--fin-secondary);
  letter-spacing: 0.2px;
}

.form-label .required-star {
  color: var(--fin-accent-red);
  margin-left: 2px;
}

/* Input Amount */
.input-amount-wrapper {
  position: relative;
}

.input-amount {
  width: 100%;
  padding: 14px 16px 14px 40px;
  font-size: 1.1rem;
  font-weight: 600;
  border: 1px solid var(--fin-border);
  border-radius: var(--fin-radius-sm);
  background: var(--fin-card);
  color: var(--fin-text);
  transition: border-color var(--fin-transition), box-shadow var(--fin-transition);
  outline: none;
  font-family: inherit;
}

.input-amount:focus {
  border-color: var(--fin-border-focus);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.currency-symbol {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--fin-secondary);
  pointer-events: none;
}

.amount-hint {
  font-size: 0.72rem;
  color: var(--fin-text-light);
  margin-top: 4px;
  min-height: 16px;
}

.amount-words {
  font-size: 0.78rem;
  color: var(--fin-primary);
  margin-top: 4px;
  font-style: italic;
  min-height: 18px;
  font-weight: 500;
}

/* Select */
.select-wrapper {
  position: relative;
}

.select-wrapper::after {
  content: '';
  position: absolute;
  right: 14px;
  top: 50%;
  transform: translateY(-50%);
  width: 0;
  height: 0;
  border-left: 5px solid transparent;
  border-right: 5px solid transparent;
  border-top: 5px solid var(--fin-secondary);
  pointer-events: none;
}

select {
  width: 100%;
  padding: 14px 40px 14px 14px;
  font-size: 0.9rem;
  font-weight: 500;
  border: 1px solid var(--fin-border);
  border-radius: var(--fin-radius-sm);
  background: var(--fin-card);
  color: var(--fin-text);
  cursor: pointer;
  appearance: none;
  -webkit-appearance: none;
  transition: border-color var(--fin-transition), box-shadow var(--fin-transition);
  outline: none;
  font-family: inherit;
}

select:focus {
  border-color: var(--fin-border-focus);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

/* Numeric Up/Down */
.numeric-updown {
  display: flex;
  align-items: center;
  border: 1px solid var(--fin-border);
  border-radius: var(--fin-radius-sm);
  background: var(--fin-card);
  overflow: hidden;
  transition: border-color var(--fin-transition), box-shadow var(--fin-transition);
}

.numeric-updown:focus-within {
  border-color: var(--fin-border-focus);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.nud-btn {
  width: 48px;
  height: 48px;
  border: none;
  margin: 0 2px;
  background: var(--fin-bg);
  font-size: 1.5rem;
  font-weight: 500;
  color: var(--fin-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--fin-transition), color var(--fin-transition);
  user-select: none;
}

.nud-btn:hover {
  background: var(--fin-primary);
  color: #fff;
}

.nud-btn:active {
  background: var(--fin-primary-light);
}

.nud-input {
  flex: 1;
  height: 48px;
  border: none;
  background: transparent;
  text-align: center;
  font-size: 1rem;
  font-weight: 600;
  color: var(--fin-text);
  padding: 0 8px;
  outline: none;
  font-family: inherit;
}

.nud-input::-webkit-outer-spin-button,
.nud-input::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

/* ---------- Compare Results ---------- */
.compare-results {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.compare-col {
  flex: 1;
  min-width: 200px;
  background: var(--fin-bg);
  border-radius: var(--fin-radius-sm);
  padding: 20px 18px;
  border: 1px solid var(--fin-border);
  text-align: center;
}

.compare-col h3 {
  font-size: 0.8rem;
  font-weight: 600;
  margin-bottom: 12px;
  color: var(--fin-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.compare-col .val {
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--fin-text);
  letter-spacing: -0.5px;
}

.compare-col .sub {
  font-size: 0.75rem;
  color: var(--fin-text-light);
  margin-top: 6px;
  font-weight: 500;
}

.highlight-best {
  background: linear-gradient(135deg, rgba(16, 185, 129, 0.08) 0%, rgba(5, 150, 105, 0.05) 100%);
  border-color: var(--fin-accent-green);
}

.highlight-best h3 {
  color: var(--fin-accent-green);
}

/* ---------- Formula Box ---------- */
.formula-box {
  margin-top: 16px;
  padding: 16px 20px;
  background: var(--fin-bg);
  border-radius: var(--fin-radius-sm);
  font-size: 0.82rem;
  color: var(--fin-secondary);
  font-weight: 500;
  border: 1px solid var(--fin-border);
  display: none;
  line-height: 1.7;
}

.formula-box.show {
  display: block;
}

/* ---------- Table ---------- */
.table-wrap {
  max-height: 480px;
  overflow-y: auto;
  border-radius: var(--fin-radius-sm);
  border: 1px solid var(--fin-border);
}

.table-wrap::-webkit-scrollbar {
  width: 6px;
}

.table-wrap::-webkit-scrollbar-track {
  background: var(--fin-bg);
}

.table-wrap::-webkit-scrollbar-thumb {
  background: var(--fin-text-light);
  border-radius: 3px;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
  min-width: 520px;
}

thead {
  position: sticky;
  top: 0;
  z-index: 2;
}

thead th {
  background: var(--fin-bg);
  padding: 12px 8px;
  text-align: right;
  font-weight: 600;
  font-size: 0.7rem;
  color: var(--fin-secondary);
  border-bottom: 1px solid var(--fin-border);
  white-space: nowrap;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

thead th:first-child {
  text-align: center;
}

tbody td {
  padding: 10px 8px;
  text-align: right;
  border-bottom: 1px solid var(--fin-border);
  font-family: 'SF Mono', 'Cascadia Code', 'Consolas', monospace;
  font-size: 0.8rem;
  background: var(--fin-card);
}

tbody td:first-child {
  text-align: center;
  font-weight: 600;
  color: var(--fin-secondary);
  font-family: inherit;
}

tbody tr:hover td {
  background: var(--fin-bg);
}

.col-payment {
  color: var(--fin-primary);
  font-weight: 600;
}

.col-principal {
  color: var(--fin-accent-green);
}

.col-interest {
  color: var(--fin-accent-amber);
}

.col-balance {
  color: var(--fin-text);
  font-weight: 600;
}

.table-info-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
  flex-wrap: wrap;
  gap: 10px;
}

.row-count {
  font-weight: 600;
  color: var(--fin-primary);
  background: rgba(30, 64, 175, 0.08);
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 0.75rem;
}

/* ---------- Toast ---------- */
.toast {
  position: fixed;
  top: 20px;
  left: 50%;
  transform: translateX(-50%) translateY(-120px);
  background: var(--fin-text);
  color: #fff;
  padding: 12px 24px;
  border-radius: var(--fin-radius-sm);
  font-size: 0.85rem;
  font-weight: 500;
  z-index: 999;
  transition: transform 0.35s cubic-bezier(0.68, -0.55, 0.265, 1.55);
  pointer-events: none;
  box-shadow: var(--fin-shadow-lg);
}

.toast.show {
  transform: translateX(-50%) translateY(0);
}

/* ---------- Rate Stage Items ---------- */
.tool-banner {
  background: var(--fin-card);
  border: 1px dashed var(--fin-border);
  border-radius: var(--fin-radius-sm);
  margin: 18px 0 20px;
  padding: 14px 18px;
  cursor: pointer;
  transition: all 0.25s;
  position: relative;
  user-select: none;
  box-shadow: var(--fin-shadow-sm);
}

.tool-banner:hover {
  background: var(--fin-bg);
  border-color: var(--fin-secondary);
}

.tool-banner .b-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--fin-text);
}

.tool-banner .b-badge {
  background: var(--fin-accent-green-light);
  color: #fff;
  padding: 3px 12px;
  border-radius: 20px;
  font-size: 0.7rem;
  letter-spacing: 0.3px;
}

.tool-banner .b-body {
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  transition: max-height 0.4s ease, opacity 0.3s, margin 0.3s;
  margin-top: 0;
}

.tool-banner.expanded .b-body {
  max-height: 200px;
  opacity: 1;
  margin-top: 14px;
}

.tool-banner .b-content {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  justify-content: center;
  font-size: 0.85rem;
}

.b-card-item {
  background: var(--fin-bg);
  border-radius: var(--fin-radius-xs);
  padding: 12px 16px;
  min-width: 130px;
  text-align: center;
  border: 1px solid var(--fin-border);
}

.b-close {
  background: none;
  border: none;
  color: var(--fin-text-light);
  cursor: pointer;
  font-size: 1.1rem;
  padding: 0 6px;
  opacity: 0.6;
  transition: opacity 0.2s;
}

.b-close:hover {
  opacity: 1;
  color: var(--fin-accent-red);
}

.rate-stage-item {
  display: flex;
  align-items: center;
  gap: 12px;
  background: var(--fin-bg);
  padding: 14px 18px;
  border-radius: var(--fin-radius-sm);
  margin-bottom: 12px;
  border: 1px solid var(--fin-border);
  flex-wrap: wrap;
}

.rate-stage-item label {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--fin-secondary);
  white-space: nowrap;
}

.rate-stage-item .stage-start-input {
  width: 72px;
  text-align: center;
  padding: 8px 6px;
  border: 1px solid var(--fin-border);
  border-radius: var(--fin-radius-xs);
  font-size: 0.9rem;
  font-weight: 600;
  background: var(--fin-card);
  font-family: inherit;
}

.remove-stage-btn {
  background: var(--fin-bg);
  border: 1px solid var(--fin-border);
  color: var(--fin-secondary);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  padding: 8px 14px;
  border-radius: var(--fin-radius-xs);
  margin-left: auto;
  transition: var(--fin-transition);
}

.remove-stage-btn:hover {
  background: var(--fin-accent-red);
  color: #fff;
  border-color: var(--fin-accent-red);
}

.add-stage-btn {
  display: block;
  width: 100%;
  margin-top: 12px;
  padding: 14px;
  background: var(--fin-bg);
  border: 1px solid var(--fin-border);
  border-radius: var(--fin-radius-sm);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--fin-secondary);
  cursor: pointer;
  transition: var(--fin-transition);
}

.add-stage-btn:hover {
  background: var(--fin-primary);
  color: #fff;
  border-color: var(--fin-primary);
}

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

/* ---------- Buttons ---------- */
.download-btn {
  padding: 14px 28px;
  background: var(--fin-primary);
  color: #fff;
  border: none;
  border-radius: var(--fin-radius-sm);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  box-shadow: var(--fin-shadow);
  transition: var(--fin-transition);
}

.download-btn:hover {
  background: var(--fin-primary-light);
  box-shadow: var(--fin-shadow-lg);
}

/* ---------- Collapsible Card ---------- */
.collapsible-card .sell-card-header {
  cursor: pointer;
  margin-bottom: 0;
  user-select: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.collapse-arrow {
  transition: transform 0.3s ease;
  font-size: 1rem;
  color: var(--fin-text-light);
}

.collapsible-content {
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  transition: max-height 0.4s ease, opacity 0.3s, margin 0.3s;
  margin-top: 0;
}

.collapsible-card.expanded .collapse-arrow {
  transform: rotate(180deg);
}

.collapsible-card.expanded .collapsible-content {
  max-height: 900px;
  opacity: 1;
  margin-top: 20px;
}

.result-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 0;
  border-bottom: 1px solid var(--fin-border);
  font-size: 0.9rem;
  font-weight: 500;
}

.result-label {
  color: var(--fin-text-muted);
}

.result-value {
  font-weight: 600;
  color: var(--fin-text);
}

.final-settlement {
  margin-top: 24px;
  padding: 20px;
  background: linear-gradient(135deg, rgba(30, 64, 175, 0.05) 0%, rgba(59, 130, 246, 0.05) 100%);
  border-radius: var(--fin-radius-sm);
  text-align: center;
  border: 1px solid rgba(30, 64, 175, 0.15);
}

.final-label {
  display: block;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--fin-secondary);
  margin-bottom: 8px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.final-value {
  font-size: 2rem;
  font-weight: 700;
  color: var(--fin-primary);
}

/* ---------- Checkbox ---------- */
.checkbox-label {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--fin-text);
  cursor: pointer;
}

.checkbox-label input[type="checkbox"] {
  width: 18px;
  height: 18px;
  accent-color: var(--fin-primary);
  cursor: pointer;
  border-radius: 4px;
}

.old-rate-area {
  display: flex;
  align-items: center;
  gap: 10px;
}

.old-rate-area.hidden {
  display: none;
}

/* ---------- Diff Display ---------- */
.diff-positive {
  color: var(--fin-accent-red);
  font-weight: 600;
}

.diff-negative {
  color: var(--fin-accent-green);
  font-weight: 600;
}

.diff-section {
  margin-top: 18px;
  padding: 18px;
  background: var(--fin-bg);
  border-radius: var(--fin-radius-sm);
  border: 1px solid var(--fin-border);
  text-align: center;
}

/* ---------- Footer ---------- */
.site-footer {
  margin-top: 48px;
  padding: 28px 0 16px;
  border-top: 1px solid var(--fin-border);
  color: var(--fin-text-light);
  font-size: 0.8rem;
  text-align: center;
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 14px;
}

.footer-links {
  display: flex;
  gap: 22px;
}

.footer-links a {
  color: var(--fin-secondary);
  text-decoration: none;
  font-weight: 500;
  transition: color var(--fin-transition);
}

.footer-links a:hover {
  color: var(--fin-primary);
}

/* ---------- Floating About Button ---------- */
.floating-about-btn {
  position: fixed;
  bottom: 28px;
  right: 28px;
  width: 52px;
  height: 52px;
  background: var(--fin-primary);
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  font-weight: 600;
  text-decoration: none;
  box-shadow: var(--fin-shadow-lg);
  z-index: 999;
  transition: var(--fin-transition);
}

.floating-about-btn:hover {
  background: var(--fin-primary-light);
  box-shadow: 0 10px 25px rgba(30, 64, 175, 0.3);
}

/* ---------- Disclaimer Box ---------- */
.disclaimer-box {
  background: var(--fin-bg);
  border: 1px solid var(--fin-border);
  border-radius: var(--fin-radius-sm);
  padding: 16px 20px;
  margin: 20px 0;
  font-size: 0.8rem;
  color: var(--fin-text-muted);
  line-height: 1.6;
}

.disclaimer-box strong {
  color: var(--fin-text);
}

.disclaimer {
  text-align: center;
  margin-top: 16px;
  font-size: 0.75rem;
  color: var(--fin-text-light);
}

@media (max-width: 640px) {
  .floating-about-btn {
    bottom: 16px;
    right: 16px;
    width: 48px;
    height: 48px;
    font-size: 1.2rem;
  }

  .compare-results {
    flex-direction: column;
  }

  .table-wrap {
    max-height: 360px;
  }

  body {
    padding: 12px 10px 50px;
  }

  .footer-content {
    flex-direction: column;
  }
}

/* ---------- Modal Styles ---------- */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(30, 41, 59, 0.5);
  z-index: 10000;
  display: flex;
  align-items: center;
  justify-content: center;
  backdrop-filter: blur(4px);
}

.modal-container {
  background: var(--fin-card);
  border-radius: var(--fin-radius);
  width: 90vw;
  max-width: 860px;
  height: 85vh;
  display: flex;
  flex-direction: column;
  box-shadow: var(--fin-shadow-lg);
  overflow: hidden;
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 22px;
  background: var(--fin-primary);
  color: #fff;
  font-weight: 600;
  font-size: 0.95rem;
}

.modal-close-btn {
  background: rgba(255, 255, 255, 0.2);
  border: none;
  color: #fff;
  font-size: 1.2rem;
  cursor: pointer;
  padding: 6px 14px;
  border-radius: var(--fin-radius-xs);
  font-weight: 600;
  transition: var(--fin-transition);
}

.modal-close-btn:hover {
  background: rgba(255, 255, 255, 0.3);
}

.modal-body {
  flex: 1;
  overflow: hidden;
  -webkit-overflow-scrolling: touch;
}

/* ---------- Print Styles ---------- */
@media print {
  body {
    background: white;
    padding: 0;
  }

  .card {
    box-shadow: none;
    border: 1px solid #ddd;
    break-inside: avoid;
  }

  .table-wrap {
    max-height: none;
    overflow: visible;
  }

  .app-container {
    max-width: 100%;
  }

  .input-amount,
  select,
  .numeric-updown {
    gap: 4px;
    box-shadow: none;
    border: 1px solid #ddd;
  }
}

.subtitle.disclaimer-text,
.disclaimer.no-print,
.site-footer,
.compare-col .sub {
    color: #475569 !important;
}
.compare-col-title {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--fin-text);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}