/* ==========================================================================
   Booking.com ROI & Rendement Pro Calculator
   Pure Standalone CSS3 Design System
   100% Framework-free - No Tailwind, No Bootstrap - Native Browser Standard
   ========================================================================== */

:root {
  /* Booking.com Iconic Brand Colors */
  --bkg-navy: #003580;
  --bkg-navy-dark: #00224f;
  --bkg-blue: #006ce4;
  --bkg-blue-hover: #0057b8;
  --bkg-blue-light: #e7f0fa;
  --bkg-yellow: #febb02;
  --bkg-yellow-hover: #f5b000;
  --bkg-yellow-light: #fff8e6;
  
  /* Financial status colors */
  --emerald: #008234;
  --emerald-hover: #006b2b;
  --emerald-light: #e8f5ed;
  --emerald-border: #b7e4c7;
  
  --amber: #d97706;
  --amber-light: #fef3c7;
  --amber-border: #fcd34d;
  
  --rose: #cf0007;
  --rose-light: #fbebee;
  --rose-border: #f5c2c7;
  
  /* Neutrals & Slate */
  --slate-50: #f8f9fa;
  --slate-100: #f0f3f6;
  --slate-200: #e2e8f0;
  --slate-300: #cbd5e1;
  --slate-400: #94a3b8;
  --slate-500: #64748b;
  --slate-600: #475569;
  --slate-700: #334155;
  --slate-800: #1e293b;
  --slate-900: #0f172a;
  
  --card-bg: #ffffff;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 10px -1px rgba(0, 53, 128, 0.08), 0 2px 5px -1px rgba(0, 0, 0, 0.04);
  --shadow-lg: 0 12px 24px -4px rgba(0, 53, 128, 0.12), 0 6px 12px -2px rgba(0, 0, 0, 0.05);
  
  --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
}

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

body {
  font-family: var(--font-family);
  background-color: var(--slate-100);
  color: var(--slate-800);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  padding-bottom: 4rem;
}

/* ==========================================================================
   Header & Brand Navigation
   ========================================================================== */
header.app-header {
  background: var(--bkg-navy);
  color: #ffffff;
  padding: 0.9rem 1.5rem;
  border-bottom: 2px solid var(--bkg-yellow);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 4px 14px rgba(0, 34, 79, 0.25);
}

.header-container {
  max-width: 1440px;
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}

.brand-icon {
  width: 44px;
  height: 44px;
  background: var(--bkg-blue);
  border: 2px solid var(--bkg-yellow);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #ffffff;
  font-weight: 900;
  font-size: 1.35rem;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
  letter-spacing: -0.5px;
}

.brand-title h1 {
  font-size: 1.25rem;
  font-weight: 800;
  color: #ffffff;
  letter-spacing: -0.02em;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.brand-tag {
  background: var(--bkg-yellow);
  color: var(--bkg-navy-dark);
  font-size: 0.65rem;
  font-weight: 800;
  padding: 0.15rem 0.45rem;
  border-radius: var(--radius-sm);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.brand-title p {
  font-size: 0.75rem;
  color: rgba(255, 255, 255, 0.8);
  margin-top: 2px;
}

.header-controls {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
}

.select-wrapper {
  position: relative;
  display: inline-block;
}

.select-control {
  background: rgba(255, 255, 255, 0.12);
  color: #ffffff;
  border: 1px solid rgba(255, 255, 255, 0.25);
  padding: 0.5rem 2rem 0.5rem 0.85rem;
  font-size: 0.825rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  appearance: none;
  cursor: pointer;
  outline: none;
  transition: all 0.15s ease;
}

.select-control option {
  background: var(--bkg-navy-dark);
  color: #ffffff;
}

.select-control:focus, .select-control:hover {
  background: rgba(255, 255, 255, 0.2);
  border-color: var(--bkg-yellow);
}

.select-arrow {
  position: absolute;
  right: 0.7rem;
  top: 50%;
  transform: translateY(-50%);
  pointer-events: none;
  font-size: 0.65rem;
  color: var(--bkg-yellow);
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.5rem 0.9rem;
  font-size: 0.825rem;
  font-weight: 700;
  border-radius: var(--radius-sm);
  cursor: pointer;
  border: none;
  transition: all 0.15s ease;
  text-decoration: none;
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.12);
  color: #ffffff;
  border: 1px solid rgba(255, 255, 255, 0.25);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.22);
  color: #ffffff;
  border-color: #ffffff;
}

.btn-primary {
  background: var(--bkg-yellow);
  color: var(--bkg-navy-dark);
  font-weight: 800;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.15);
}

.btn-primary:hover {
  background: var(--bkg-yellow-hover);
  transform: translateY(-1px);
}

/* ==========================================================================
   Main Layout & Grid
   ========================================================================== */
.main-wrapper {
  max-width: 1440px;
  margin: 1.5rem auto;
  padding: 0 1.25rem;
}

/* KPI Scorecards Top Banner */
.kpi-banner {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.kpi-card {
  background: var(--card-bg);
  border: 1px solid var(--slate-200);
  border-radius: var(--radius-md);
  padding: 1rem 1.15rem;
  box-shadow: var(--shadow-sm);
  position: relative;
  overflow: hidden;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.kpi-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.kpi-card.accent-emerald {
  border-left: 4px solid var(--emerald);
  background: linear-gradient(180deg, #ffffff 0%, #f4fbf7 100%);
}

.kpi-card.accent-blue {
  border-left: 4px solid var(--bkg-blue);
  background: linear-gradient(180deg, #ffffff 0%, #f3f7fd 100%);
}

.kpi-card.accent-amber {
  border-left: 4px solid var(--amber);
  background: linear-gradient(180deg, #ffffff 0%, #fffbf0 100%);
}

.kpi-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.4rem;
}

.kpi-title {
  font-size: 0.775rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.4px;
  color: var(--slate-500);
}

.kpi-badge {
  font-size: 0.675rem;
  font-weight: 700;
  padding: 0.15rem 0.45rem;
  border-radius: var(--radius-sm);
  background: var(--slate-100);
  color: var(--slate-600);
}

.badge-green {
  background: var(--emerald-light);
  color: var(--emerald);
  border: 1px solid var(--emerald-border);
}

.badge-amber {
  background: var(--amber-light);
  color: var(--amber);
  border: 1px solid var(--amber-border);
}

.badge-red {
  background: var(--rose-light);
  color: var(--rose);
  border: 1px solid var(--rose-border);
}

.badge-blue {
  background: var(--bkg-blue-light);
  color: var(--bkg-blue);
}

.badge-genius {
  background: var(--bkg-yellow-light);
  color: #925800;
  border: 1px solid #ffd666;
}

.kpi-value {
  font-size: 1.55rem;
  font-weight: 800;
  color: var(--slate-900);
  line-height: 1.2;
}

.kpi-sub {
  font-size: 0.75rem;
  color: var(--slate-500);
  margin-top: 0.25rem;
  font-weight: 500;
}

/* Two-column layout */
.content-grid {
  display: grid;
  grid-template-columns: 460px 1fr;
  gap: 1.5rem;
  align-items: start;
}

@media (max-width: 1100px) {
  .content-grid {
    grid-template-columns: 1fr;
  }
}

/* ==========================================================================
   Form Column & Panels
   ========================================================================== */
.form-column {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.panel-card {
  background: var(--card-bg);
  border: 1px solid var(--slate-200);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}

.panel-header {
  padding: 0.85rem 1.15rem;
  background: #ffffff;
  border-bottom: 1px solid var(--slate-200);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.panel-title {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.925rem;
  font-weight: 800;
  color: var(--bkg-navy);
}

.panel-title svg {
  color: var(--bkg-blue);
}

.panel-body {
  padding: 1.15rem;
}

/* Form controls */
.form-group {
  margin-bottom: 0.95rem;
}

.form-group:last-child {
  margin-bottom: 0;
}

.form-label-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 0.35rem;
}

.form-label {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--slate-700);
}

.form-hint {
  font-size: 0.725rem;
  color: var(--slate-500);
}

.input-with-adornment {
  position: relative;
  display: flex;
  align-items: center;
}

.adornment-prefix, .adornment-suffix {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  font-size: 0.825rem;
  font-weight: 600;
  color: var(--slate-500);
  pointer-events: none;
}

.adornment-prefix {
  left: 0.75rem;
}

.adornment-suffix {
  right: 0.75rem;
}

.form-input {
  width: 100%;
  padding: 0.45rem 0.75rem;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--slate-800);
  background: #ffffff;
  border: 1px solid var(--slate-300);
  border-radius: var(--radius-sm);
  outline: none;
  transition: all 0.15s ease;
}

.form-input:focus {
  border-color: var(--bkg-blue);
  box-shadow: 0 0 0 3px rgba(0, 108, 228, 0.15);
}

.form-input.has-prefix {
  padding-left: 1.85rem;
}

.form-input.has-suffix {
  padding-right: 1.85rem;
}

/* Range Slider */
.range-slider {
  width: 100%;
  height: 5px;
  background: var(--slate-200);
  border-radius: 4px;
  outline: none;
  margin: 0.45rem 0 0.2rem;
  -webkit-appearance: none;
  appearance: none;
  cursor: pointer;
}

.range-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--bkg-blue);
  border: 2px solid #ffffff;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.25);
  cursor: pointer;
  transition: transform 0.1s ease;
}

.range-slider::-webkit-slider-thumb:hover {
  transform: scale(1.15);
  background: var(--bkg-navy);
}

.range-slider::-moz-range-thumb {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--bkg-blue);
  border: 2px solid #ffffff;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.25);
  cursor: pointer;
}

/* Quick Steppers & Pills */
.quick-steppers {
  display: flex;
  gap: 0.35rem;
  margin-top: 0.35rem;
  flex-wrap: wrap;
}

.step-btn {
  background: var(--slate-100);
  border: 1px solid var(--slate-200);
  color: var(--slate-600);
  padding: 0.15rem 0.5rem;
  font-size: 0.725rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.15s ease;
}

.step-btn:hover {
  background: var(--bkg-blue-light);
  color: var(--bkg-blue);
  border-color: var(--bkg-blue);
}

.summary-pill-row {
  margin-top: 0.85rem;
  padding: 0.65rem 0.85rem;
  background: var(--slate-50);
  border: 1px solid var(--slate-200);
  border-radius: var(--radius-sm);
  display: flex;
  justify-content: space-between;
  font-size: 0.775rem;
  font-weight: 600;
  color: var(--slate-700);
}

.summary-pill-row span {
  font-weight: 800;
  color: var(--bkg-navy);
}

/* Custom Switch Toggle */
.switch {
  position: relative;
  display: inline-block;
  width: 36px;
  height: 20px;
}

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

.slider-switch {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: var(--slate-300);
  transition: .2s;
  border-radius: 20px;
}

.slider-switch:before {
  position: absolute;
  content: "";
  height: 14px;
  width: 14px;
  left: 3px;
  bottom: 3px;
  background-color: white;
  transition: .2s;
  border-radius: 50%;
}

input:checked + .slider-switch {
  background-color: var(--bkg-blue);
}

input:checked + .slider-switch:before {
  transform: translateX(16px);
}

/* ==========================================================================
   Results Column & Interactive Tabs
   ========================================================================== */
.results-column {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.tabs-nav {
  display: flex;
  background: var(--slate-50);
  border-bottom: 1px solid var(--slate-200);
  overflow-x: auto;
  white-space: nowrap;
}

.tab-btn {
  padding: 0.85rem 1.15rem;
  background: transparent;
  border: none;
  font-size: 0.825rem;
  font-weight: 700;
  color: var(--slate-500);
  cursor: pointer;
  border-bottom: 3px solid transparent;
  transition: all 0.15s ease;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}

.tab-btn:hover {
  color: var(--bkg-blue);
  background: rgba(0, 108, 228, 0.04);
}

.tab-btn.active {
  color: var(--bkg-navy);
  border-bottom-color: var(--bkg-yellow);
  background: #ffffff;
}

/* TAB 1: Waterfall Breakdown */
.waterfall-bar-container {
  background: var(--slate-50);
  border: 1px solid var(--slate-200);
  border-radius: var(--radius-md);
  padding: 1.15rem;
  margin-bottom: 1.25rem;
}

.waterfall-bar {
  display: flex;
  height: 28px;
  border-radius: var(--radius-sm);
  overflow: hidden;
  box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.15);
  background: var(--slate-200);
}

.bar-segment {
  height: 100%;
  transition: width 0.3s ease;
  position: relative;
}

.bar-net { background: var(--emerald); }
.bar-debt { background: #4f46e5; }
.bar-mgt { background: var(--amber); }
.bar-clean { background: #0284c7; }
.bar-bkg-fee { background: var(--bkg-blue); }
.bar-payments { background: #0891b2; }
.bar-genius { background: #eab308; }
.bar-opex { background: #64748b; }

.legend-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 0.6rem;
  margin-top: 1rem;
  font-size: 0.75rem;
  color: var(--slate-700);
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-weight: 600;
}

.legend-color {
  width: 12px;
  height: 12px;
  border-radius: 2px;
  display: inline-block;
  flex-shrink: 0;
}

/* Ledger & Tables */
.ledger-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.825rem;
}

.ledger-table th {
  text-align: left;
  padding: 0.65rem 0.85rem;
  background: var(--slate-50);
  color: var(--slate-600);
  font-weight: 700;
  border-bottom: 2px solid var(--slate-200);
  font-size: 0.75rem;
  text-transform: uppercase;
}

.ledger-table th:nth-child(2),
.ledger-table th:nth-child(3),
.ledger-table th:nth-child(4) {
  text-align: right;
}

.ledger-table td {
  padding: 0.55rem 0.85rem;
  border-bottom: 1px solid var(--slate-200);
  color: var(--slate-800);
}

.ledger-table td:nth-child(2),
.ledger-table td:nth-child(3),
.ledger-table td:nth-child(4) {
  text-align: right;
  font-variant-numeric: tabular-nums;
}

.ledger-table tr.total-row {
  background: var(--slate-50);
  font-weight: 700;
  border-top: 1px solid var(--slate-300);
  border-bottom: 1px solid var(--slate-300);
}

.ledger-table tr.font-bold {
  font-weight: 700;
}

.ledger-table tr.net-cashflow-row {
  background: var(--emerald-light);
  color: #064e3b;
  font-weight: 800;
  font-size: 0.875rem;
}

.ledger-table tr.net-cashflow-row td {
  border-top: 2px solid var(--emerald-border);
  border-bottom: 2px solid var(--emerald-border);
}

/* TAB 2: Sensitivity Heatmap */
.sensitivity-table-wrapper {
  overflow-x: auto;
  border: 1px solid var(--slate-200);
  border-radius: var(--radius-md);
}

.sensitivity-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.775rem;
  text-align: center;
}

.sensitivity-table th {
  background: var(--slate-100);
  padding: 0.65rem 0.5rem;
  font-weight: 700;
  color: var(--slate-700);
  border-bottom: 1px solid var(--slate-200);
  border-right: 1px solid var(--slate-200);
}

.sensitivity-table th:first-child {
  text-align: left;
  padding-left: 0.85rem;
}

.heatmap-cell {
  padding: 0.65rem 0.45rem;
  border-bottom: 1px solid var(--slate-200);
  border-right: 1px solid var(--slate-200);
  cursor: pointer;
  transition: all 0.15s ease;
  font-variant-numeric: tabular-nums;
}

.heatmap-cell:hover {
  outline: 2px solid var(--bkg-navy);
  z-index: 10;
  position: relative;
  transform: scale(1.04);
}

.heatmap-cell.cell-current {
  outline: 2px solid var(--bkg-blue);
  box-shadow: 0 0 8px rgba(0, 108, 228, 0.4);
  font-weight: 900;
}

.heatmap-cell .roi-text {
  display: block;
  font-weight: 800;
  font-size: 0.825rem;
}

.heatmap-cell .cash-text {
  display: block;
  font-size: 0.7rem;
  opacity: 0.85;
}

.cell-high { background-color: #d1fae5; color: #065f46; }
.cell-mid-high { background-color: #ecfdf5; color: #047857; }
.cell-mid { background-color: #fef3c7; color: #92400e; }
.cell-low { background-color: #fee2e2; color: #991b1b; }
.cell-negative { background-color: #fecaca; color: #7f1d1d; font-weight: 800; }

/* TAB 3: Chart Container */
.chart-container {
  background: var(--slate-50);
  border: 1px solid var(--slate-200);
  border-radius: var(--radius-md);
  padding: 1rem;
  margin: 1rem 0;
}

.chart-svg {
  width: 100%;
  height: auto;
  overflow: visible;
}

/* TAB 4: Comparison Cards */
.comparison-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-top: 1rem;
}

@media (max-width: 650px) {
  .comparison-grid {
    grid-template-columns: 1fr;
  }
}

.comparison-box {
  background: var(--card-bg);
  border: 1px solid var(--slate-200);
  border-radius: var(--radius-md);
  padding: 1.15rem;
  box-shadow: var(--shadow-sm);
  transition: all 0.2s ease;
}

.comparison-box.highlight {
  border: 2px solid var(--bkg-blue);
  background: linear-gradient(180deg, #ffffff 0%, #f7faff 100%);
  box-shadow: var(--shadow-md);
}

.comparison-metric {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.45rem 0;
  border-bottom: 1px solid var(--slate-100);
  font-size: 0.8rem;
}

.comparison-metric:last-child {
  border-bottom: none;
}

.comparison-label {
  color: var(--slate-600);
}

.comparison-val {
  font-weight: 700;
  color: var(--slate-900);
}

/* TAB 5: Saved Scenarios Manager */
.scenario-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1rem;
  border: 1px solid var(--slate-200);
  border-radius: var(--radius-sm);
  margin-bottom: 0.5rem;
  background: #ffffff;
}

.scenario-info h5 {
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--slate-800);
}

.scenario-info p {
  font-size: 0.725rem;
  color: var(--slate-500);
}

/* ==========================================================================
   Toast Notification
   ========================================================================== */
#toast {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  background: var(--bkg-navy);
  color: #ffffff;
  border-left: 4px solid var(--bkg-yellow);
  padding: 0.75rem 1.25rem;
  font-size: 0.825rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-lg);
  transform: translateY(120%);
  opacity: 0;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  z-index: 9999;
}

#toast.show {
  transform: translateY(0);
  opacity: 1;
}

/* ==========================================================================
   Print / PDF Styles
   ========================================================================== */
#print-report-area {
  display: none;
}

@media print {
  body {
    background: #ffffff;
    padding: 0;
    color: #000000;
  }

  header.app-header,
  .main-wrapper,
  #toast {
    display: none !important;
  }

  #print-report-area {
    display: block !important;
    width: 100%;
    margin: 0;
    padding: 1.5cm;
  }
}