/* Modern Reset & Variables */
:root {
  /* Colors */
  --primary: #0078d4;
  --primary-hover: #106ebe;
  --primary-dark: #005a9e;
  --secondary: #2b88d8;
  --success: #107c10;
  --warning: #d83b01;
  --danger: #e81123;
  
  /* Backgrounds */
  --bg-body: #f3f2f1;
  --bg-card: #ffffff;
  --bg-input: #ffffff;
  --bg-hover: #f8f9fa;
  
  /* Text */
  --text-primary: #201f1e;
  --text-secondary: #605e5c;
  --text-tertiary: #6b6b6b; /* Changed from #a19f9d (3.8:1) to #6b6b6b (4.5:1+) for WCAG AA */
  --text-on-primary: #ffffff;
  
  /* Borders */
  --border-color: #e1dfdd;
  --border-radius: 8px;
  
  /* Shadows */
  --shadow-sm: 0 2px 4px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 8px rgba(0,0,0,0.1);
  --shadow-lg: 0 8px 16px rgba(0,0,0,0.1);
  
  /* Spacing */
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  
  /* Typography */
  --font-family: 'Segoe UI', -apple-system, BlinkMacSystemFont, Roboto, 'Helvetica Neue', sans-serif;
}

body.dark-mode {
  --bg-body: #202020;
  --bg-card: #2b2b2b;
  --bg-input: #3b3a39;
  --bg-hover: #3b3a39;
  
  --text-primary: #ffffff;
  --text-secondary: #d2d0ce;
  --text-tertiary: #b0b0b0; /* Improved contrast for dark mode */
  
  /* Save dark mode preference */
  color-scheme: dark;
  
  --border-color: #484644;
  --shadow-sm: 0 2px 4px rgba(0,0,0,0.2);
  --shadow-md: 0 4px 8px rgba(0,0,0,0.3);
}

/* Global Styles */
* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: var(--font-family);
  background-color: var(--bg-body);
  color: var(--text-primary);
  line-height: 1.5;
  transition: background-color 0.3s ease, color 0.3s ease;
}

h1, h2, h3, h4 { margin-top: 0; font-weight: 600; }
h1 { font-size: 1.75rem; }
h2 { font-size: 1.5rem; color: var(--primary); }
h3 { font-size: 1.25rem; }

a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }
a:focus-visible { outline: 3px solid var(--primary); outline-offset: 2px; }

/* Focus styles for all interactive elements */
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
  outline: 3px solid var(--primary);
  outline-offset: 2px;
}

/* Keyboard navigation improvement */
[aria-current="page"] {
  font-weight: 600;
  text-decoration: underline;
}

/* Layout */
.app-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--spacing-lg);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

@media (max-width: 768px) {
  .app-container {
    padding: var(--spacing-md);
    gap: var(--spacing-md);
  }
}

@media (max-width: 480px) {
  .app-container {
    padding: var(--spacing-sm);
  }
  
  :root {
    font-size: 14px;
  }
}

/* Header */
.app-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-bottom: var(--spacing-md);
  border-bottom: 1px solid var(--border-color);
}

@media (max-width: 768px) {
  .app-header {
    flex-direction: column;
    gap: var(--spacing-md);
    align-items: flex-start;
  }
}

@media (max-width: 480px) {
  .app-header {
    flex-direction: column;
    gap: var(--spacing-sm);
  }
}

.header-title {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.header-icon { font-size: 2rem; }

/* Cards */
.card {
  background: var(--bg-card);
  border-radius: var(--border-radius);
  padding: var(--spacing-lg);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-color);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

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

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

.clickable-header { cursor: pointer; }

.card-title { margin: 0; font-size: 1.25rem; }

/* Grid Layouts */
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: var(--spacing-lg); }
.grid-3 { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: var(--spacing-lg); }
.grid-auto { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: var(--spacing-md); }

@media (max-width: 768px) {
  .grid-2, .grid-3 { grid-template-columns: 1fr; }
}

/* Inputs & Forms */
.form-group { margin-bottom: var(--spacing-md); }

label {
  display: block;
  margin-bottom: var(--spacing-xs);
  font-weight: 500;
  color: var(--text-secondary);
  font-size: 0.9rem;
}

input, select, textarea {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  background: var(--bg-input);
  color: var(--text-primary);
  font-family: inherit;
  font-size: 1rem;
  transition: border-color 0.2s;
  min-height: 40px;
}

@media (max-width: 480px) {
  input, select, textarea {
    padding: 12px 14px;
    min-height: 44px;
    font-size: 16px; /* Prevent zoom on iOS */
  }
}

input:focus, select:focus, textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 2px rgba(0, 120, 212, 0.2);
}

/* Validation errors */
input.error, select.error, textarea.error {
  border-color: var(--danger);
  box-shadow: 0 0 0 2px rgba(232, 17, 35, 0.2);
}

input:invalid { border-color: var(--danger); }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 20px;
  border-radius: var(--border-radius);
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  border: none;
  font-size: 0.95rem;
  gap: 8px;
  min-height: 40px;
  min-width: 40px;
}

@media (max-width: 480px) {
  .btn {
    padding: 12px 24px;
    min-height: 44px;
    font-size: 1rem;
  }
}

.btn-primary { background: var(--primary); color: var(--text-on-primary); }
.btn-primary:hover { background: var(--primary-hover); }
.btn-primary:active { transform: scale(0.98); }

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

.btn-success { background: var(--success); color: white; }
.btn-success:hover { filter: brightness(0.9); }

.btn-icon { padding: 8px; border-radius: 50%; background: transparent; border: 1px solid var(--border-color); color: var(--text-primary); }
.btn-icon:hover { background: var(--bg-hover); }

.btn-group { display: flex; gap: var(--spacing-sm); flex-wrap: wrap; }

/* Apply Config Button */
.btn-apply-config {
  margin-top: 10px;
  width: 100%;
  padding: 8px 12px;
  background-color: var(--bg-body);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  color: var(--primary);
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  transition: all 0.2s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
}

.btn-apply-config:hover {
  background-color: var(--primary);
  color: white;
  border-color: var(--primary);
  box-shadow: var(--shadow-sm);
}

.btn-apply-config:active {
  transform: scale(0.98);
}

.btn-apply-config.applied {
  background-color: var(--success);
  color: white;
  border-color: var(--success);
  cursor: default;
}

/* Result Cards (Enhanced) */
.result-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  padding: var(--spacing-lg);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
  position: relative;
  transition: transform 0.2s, box-shadow 0.2s;
}

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

.result-card.best-offer {
  border: 2px solid var(--success);
  background: rgba(16, 124, 16, 0.03);
}

.result-card.card-optimized {
  border: 2px solid var(--secondary);
  background: rgba(43, 136, 216, 0.04);
}

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

.offer-title {
  margin: 0;
  font-size: 1.1rem;
  color: var(--text-secondary);
  font-weight: 600;
}

.badge-best {
  background: var(--success);
  color: white;
  font-size: 0.75rem;
  padding: 4px 8px;
  border-radius: 12px;
  font-weight: 600;
  text-transform: uppercase;
}

.cost-display {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin: 8px 0;
}

.cost-main {
  font-size: 2rem;
  font-weight: 700;
  color: var(--text-primary);
}

.cost-sub {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.savings-row {
  display: flex;
  justify-content: space-between;
  font-size: 0.95rem;
  padding: 4px 0;
  border-bottom: 1px solid transparent;
}

.savings-row.highlight {
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
  padding: 8px 0;
  font-weight: 600;
}

.savings-row .label { color: var(--text-secondary); }
.savings-row .value { color: var(--text-primary); font-weight: 500; }
.savings-row .value.text-success { color: var(--success); }
.savings-row.savings-divider {
  margin-top: 8px;
  border-top: 1px dashed var(--border-color);
  padding-top: 4px;
}
.value-strong { font-weight: 700; }

/* Logs */
.log-container {
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  padding: var(--spacing-md);
  font-family: 'Consolas', monospace;
  font-size: 0.85rem;
  max-height: 200px;
  overflow-y: auto;
  color: var(--text-secondary);
}

.log {
  background: var(--bg-input);
  padding: 12px;
  border-radius: var(--border-radius);
  font-family: monospace;
  font-size: 0.9rem;
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
}

/* Tempo Calendar */
.tempo-calendar-wrapper {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--spacing-md);
}

.tempo-month {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  padding: var(--spacing-md);
}

.tempo-month h5 {
  margin: 0 0 12px;
  text-align: center;
  font-size: 1rem;
}

.tempo-grid {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 4px;
  margin-top: var(--spacing-sm);
}

.tempo-weekdays {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 4px;
  margin-bottom: 8px;
  text-align: center;
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.tempo-day {
  aspect-ratio: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  font-size: 0.8rem;
  color: white;
  font-weight: 500;
}

.tempo-day.empty { background: transparent; }
.tempo-day.dim { opacity: 0.3; background: var(--text-tertiary); }

.tempo-tooltip {
  position: fixed;
  pointer-events: none;
  background: #222;
  color: #fff;
  padding: 6px 8px;
  border-radius: 6px;
  font-size: 13px;
  z-index: 2000;
  box-shadow: 0 6px 16px rgba(0,0,0,0.25);
  display: none;
}

/* Utilities */
.hidden { display: none !important; }
.text-center { text-align: center; }
.text-muted { color: var(--text-secondary); }
.text-sm { font-size: 0.85rem; }
.text-strong { font-weight: 700; }
.text-primary { color: var(--primary); }
.text-success { color: var(--success); }
.text-danger { color: var(--danger); }
.mt-4 { margin-top: var(--spacing-lg); }
.mb-4 { margin-bottom: var(--spacing-lg); }
.mt-2 { margin-top: var(--spacing-sm); }
.mt-3 { margin-top: var(--spacing-md); }
.mt-5 { margin-top: 2rem; }
.m-0 { margin: 0; }
.w-100 { width: 100%; }
.flex-row { display: flex; }
.align-center { align-items: center; }
.gap-sm { gap: var(--spacing-sm); }
.flex-1 { flex: 1; }
.flex-center { display: flex; align-items: center; justify-content: center; }

.alert-stack { display: grid; gap: var(--spacing-sm); }
.alert {
  padding: 8px 12px;
  border-radius: 6px;
  border: 1px solid transparent;
  font-size: 0.85rem;
}
.alert-compact { padding: 4px 6px; font-size: 0.8rem; }
.alert-center { text-align: center; }
.alert-success { color: #155724; background-color: #d4edda; border-color: #c3e6cb; }
.alert-warning { color: #856404; background-color: #fff3cd; border-color: #ffeeba; }
.alert-info { color: #004085; background-color: #cce5ff; border-color: #b8daff; }
.alert-error { color: #b00020; background: #fff0f0; border-color: #f3c2c2; }

/* Loading Bar */
.loading-container { margin-top: var(--spacing-md); }
.loading-bar { height: 4px; background: var(--border-color); border-radius: 2px; overflow: hidden; }
.loading-fill { height: 100%; background: var(--primary); width: 0%; transition: width 0.3s; }
.loading-text { font-size: 0.85rem; color: var(--text-secondary); margin-top: 6px; text-align: right; }

/* Tables */
table { width: 100%; border-collapse: collapse; margin-top: 12px; }
th, td { padding: 12px; border-bottom: 1px solid var(--border-color); text-align: left; }
th { font-weight: 600; color: var(--text-secondary); text-transform: uppercase; font-size: 0.85rem; }
tr:last-child td { border-bottom: none; }

/* Toggle Switch */
.switch {
  position: relative;
  display: inline-block;
  width: 40px;
  height: 22px;
  margin-right: 8px;
}

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

.slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: #ccc;
  transition: .4s;
  border-radius: 22px;
}

.slider:before {
  position: absolute;
  content: "";
  height: 16px;
  width: 16px;
  left: 3px;
  bottom: 3px;
  background-color: white;
  transition: .4s;
  border-radius: 50%;
}

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

input:focus + .slider {
  box-shadow: 0 0 1px var(--primary);
}

input:checked + .slider:before {
  transform: translateX(18px);
}

/* File Upload Zone */
.file-drop-zone {
  border: 2px dashed var(--border-color);
  border-radius: var(--border-radius);
  padding: var(--spacing-xl);
  text-align: center;
  cursor: pointer;
  transition: all 0.2s ease;
  background-color: var(--bg-input);
  position: relative;
}

.file-drop-zone:hover, .file-drop-zone.drag-over {
  border-color: var(--primary);
  background-color: var(--bg-hover);
}

.file-drop-zone input[type="file"] {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  cursor: pointer;
}

.file-drop-zone-icon {
  font-size: 3rem;
  color: var(--primary);
  margin-bottom: var(--spacing-md);
  display: block;
}

.file-drop-zone-text {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--spacing-xs);
}

.file-drop-zone-subtext {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.file-drop-zone.has-file {
  border-style: solid;
  border-color: var(--success);
  background-color: rgba(16, 124, 16, 0.05);
}

.file-drop-zone.has-file .file-drop-zone-icon {
  color: var(--success);
}

/* Arrow Icon Rotation */
.arrow-icon {
  display: inline-block;
  font-size: 1.2rem;
  color: var(--text-secondary);
}

.arrow-animate { transition: transform 0.3s; }

.arrow-icon.rotated {
  transform: rotate(-180deg);
}

/* Secondary Panel (for nested settings) */
.panel-secondary {
  background-color: var(--bg-hover);
  padding: 10px;
  border-radius: 4px;
  margin-top: var(--spacing-sm);
}

.panel-secondary .separator {
  border-top: 1px solid var(--border-color);
  padding-top: 8px;
  margin-top: var(--spacing-sm);
  margin-bottom: 0;
}

.card-header-row-full {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
}

.chart-narrow {
  max-width: 300px;
  margin: 0 auto;
}

.btn-compact {
  padding: 0 12px;
  font-size: 0.85rem;
}

.form-group-compact { margin-bottom: 0; }
.label-sm { font-size: 0.9rem; }
.label-row { display: flex; justify-content: space-between; }
.toggle-label { margin: 0; cursor: pointer; font-weight: 600; }
.table-scroll { overflow-x: auto; }
.pre-plain { background: transparent; border: none; padding: 0; }
.chart-canvas-small { max-width: 100%; max-height: 300px; }
.row-divider { border-top: 1px solid var(--border-color); }

.report-card { text-align: left; position: relative; }
.report-card-title { margin-bottom: 10px; color: var(--primary); }
.report-card-subtext { font-size: 0.9rem; margin-bottom: 8px; color: var(--text-secondary); }
.report-card-metric { font-size: 0.9rem; margin-bottom: 4px; }
.report-card-gain { font-size: 0.9rem; margin-top: 8px; padding-top: 8px; border-top: 1px solid var(--border-color); }
.report-card-gain-value { font-size: 1.1rem; font-weight: 700; }

/* Input Validation States */
input.input-error {
  border-color: var(--danger) !important;
  background-color: #fff5f5;
}

input.input-error:focus {
  box-shadow: 0 0 0 3px rgba(232, 17, 35, 0.1);
}

.log-error {
  color: var(--danger);
  padding: 8px 12px;
  background-color: #fff5f5;
  border-left: 3px solid var(--danger);
  margin-top: 8px;
  border-radius: var(--border-radius);
  font-size: 0.9rem;
}

.log-success {
  color: var(--success);
  padding: 8px 12px;
  background-color: #f5fff5;
  border-left: 3px solid var(--success);
  margin-top: 8px;
  border-radius: var(--border-radius);
  font-size: 0.9rem;
}

.loading {
  opacity: 0.6;
  pointer-events: none;
}

/* Print Styles */
@media print {
  /* Masquer les étapes d'import (parties 1 et 2) */
  #step-1-panel,
  #step-2-panel {
    display: none !important;
  }
}