/* =========================================
 1. VARIABLES & THEME
 ========================================= */
:root {
  --bg-color: #f8fafc;
  --panel-bg: rgba(255, 255, 255, 0.9);
  --text-color: #0f172a;
  --text-secondary: #475569;
  --input-border: rgba(0,0,0,0.15);
  --input-focus: #2563eb;
  --shadow-color: rgba(0, 0, 0, 0.12);
  --section-border: rgba(0,0,0,0.08);
  --burger-color: #0f172a;
  --canvas-bg: #ffffff;
  --result-bg: rgba(241, 245, 249, 0.8);
  
  --reset-color: #e74c3c;
  --pause-color: #3498db;
  --go-color: #2ecc71;
  --theme-transition: background-color 0.4s ease, color 0.4s ease;
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
}

[data-theme="dark"] {
  --bg-color: #0f172a;
  --panel-bg: rgba(30, 41, 59, 0.85);
  --text-color: #f1f5f9;
  --text-secondary: #94a3b8;
  --input-border: rgba(255,255,255,0.1);
  --input-focus: #38bdf8;
  --shadow-color: rgba(0, 0, 0, 0.5);
  --section-border: rgba(255,255,255,0.05);
  --burger-color: #f1f5f9;
  --canvas-bg: #0f172a;
  --result-bg: rgba(15, 23, 42, 0.6);
}

/* =========================================
 2. CONFIGURATION GÉNÉRALE
 ========================================= */
* {
  box-sizing: border-box;
}

body {
  margin: 0;
  overflow: hidden;
  font-family: var(--font-family);
  background-color: var(--bg-color);
  color: var(--text-color);
  transition: var(--theme-transition);
}

#container {
  position: relative;
  width: 100vw;
  height: 100vh;
}

/* =========================================
 3. ZONE DE SIMULATION (CANVAS)
 ========================================= */
#simulation-area {
  width: 100%;
  height: 100%;
  position: relative;
  background: var(--canvas-bg);
  transition: var(--theme-transition);
}

#simCanvas {
  display: block;
  width: 100%;
  height: 100%;
  z-index: 10;
  pointer-events: auto;
}

#graph-title {
  position: absolute;
  width: 100%;
  text-align: center;
  margin: 0;
  pointer-events: none;
  color: var(--text-secondary);
  font-weight: 600;
  z-index: 5;
  line-height: 1.4;
  top: 60px;
  font-size: 1.1em;
  padding: 0 10px;
  text-shadow: 0 2px 4px var(--shadow-color);
}

@media (min-width: 768px) {
  #graph-title {
    top: 20px;
    font-size: 1.4em;
    padding: 0 60px;
  }
}

/* =========================================
 4. PANNEAU LATÉRAL
 ========================================= */
#panel {
  position: absolute;
  top: 0;
  left: 0;
  height: 100vh;
  width: 360px;
  max-width: 85vw;
  background: var(--panel-bg);
  box-shadow: 4px 0 25px var(--shadow-color);
  transform: translateX(-100%);
  transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1), background-color 0.4s ease;
  z-index: 1000;
  display: flex;
  flex-direction: column;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-right: 1px solid var(--section-border);
}

#panel.open {
  transform: translateX(0);
}

#panelHeader {
  position: sticky;
  top: 0;
  z-index: 100;
  padding: 15px 20px;
  background: var(--panel-bg);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--section-border);
  display: flex;
  justify-content: flex-end;
  align-items: center;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Effet semi-transparent et ombre au scroll */
#panel.has-scroll #panelHeader {
  background: rgba(255, 255, 255, 0.4);
  box-shadow: 0 4px 12px rgba(0,0,0,0.05);
  border-bottom-color: rgba(0,0,0,0.05);
}

[data-theme="dark"] #panel.has-scroll #panelHeader {
  background: rgba(15, 23, 42, 0.4);
  box-shadow: 0 4px 12px rgba(0,0,0,0.2);
  border-bottom-color: rgba(255,255,255,0.05);
}

#themeToggleBtn {
  margin-right: 12px;
}

#panelHeader .icon-btn {
  background: transparent;
  border: none;
  color: var(--text-color);
  cursor: pointer;
  padding: 8px;
  border-radius: 10px;
  transition: all 0.2s ease;
  display: flex;
  align-items: center;
  justify-content: center;
}

#panelHeader .icon-btn:hover {
  background: rgba(0,0,0,0.05);
  transform: translateY(-1px);
}

[data-theme="dark"] #panelHeader .icon-btn:hover {
  background: rgba(255,255,255,0.08);
}

#panelHeader .icon-btn svg {
  stroke-width: 1.5px;
}

#panelContent {
  flex: 1;
  overflow-y: auto;
  padding: 10px 20px 20px 20px;
  scrollbar-width: thin;
}

/* =========================================
 5. CONTROLES CAMERA
 ========================================= */
#cameraControls {
  position: absolute;
  top: 20px;
  right: 20px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  z-index: 100;
}

.camera-btn {
  width: 46px;
  height: 46px;
  background: var(--panel-bg);
  border: 1px solid var(--section-border);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: 0 6px 16px var(--shadow-color);
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  color: var(--text-color);
}

.camera-btn:hover {
  transform: scale(1.05);
  box-shadow: 0 8px 20px var(--shadow-color);
  background: white;
}

[data-theme="dark"] .camera-btn:hover {
  background: #1e293b;
}

.camera-btn.active {
  background: var(--input-focus);
  color: white;
  border-color: var(--input-focus);
}

.camera-btn svg {
  transition: transform 0.3s ease;
}

.camera-btn:hover svg {
  transform: scale(1.15);
}

.camera-btn.disabled {
  opacity: 0.4;
  pointer-events: none;
}

/* =========================================
 6. BOUTON BURGER & ICONES
 ========================================= */
#openBtn {
  position: absolute;
  top: 20px;
  left: 20px;
  z-index: 100;
  background: var(--panel-bg);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid var(--section-border);
  padding: 12px;
  border-radius: 12px;
  box-shadow: 0 4px 12px var(--shadow-color);
  cursor: pointer;
  display: flex;
  flex-direction: column;
  gap: 5px;
  transition: opacity 0.3s, transform 0.2s;
}

#openBtn:active {
  transform: scale(0.95);
}

#openBtn.hidden {
  opacity: 0;
  pointer-events: none;
  transform: scale(0.9) translateX(-20px);
}

.burger-line {
  width: 24px;
  height: 2px;
  background-color: var(--burger-color);
  border-radius: 2px;
}

.icon-btn {
  background: none;
  border: none;
  font-size: 22px;
  cursor: pointer;
  padding: 8px 12px;
  border-radius: 8px;
  transition: background 0.2s, color 0.2s;
  color: var(--text-secondary);
}

.icon-btn:hover {
  background-color: var(--section-border);
  color: var(--text-color);
}

/* =========================================
 6. SECTIONS PLIABLES
 ========================================= */
.section {
  border-bottom: 1px solid var(--section-border);
}

.section-header {
  padding: 18px 5px;
  cursor: pointer;
  font-weight: 700;
  font-size: 15px;
  color: var(--text-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
  user-select: none;
  transition: color 0.2s;
}

.section-header:hover {
  color: var(--input-focus);
}

.section-header::after {
  content: "▼";
  font-size: 11px;
  color: var(--text-secondary);
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.section.collapsed .section-header::after {
  transform: rotate(-90deg);
}

.section.collapsed .section-content {
  display: none;
}

.section-content {
  padding: 0 5px 20px 5px;
  animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(-5px); }
  to { opacity: 1; transform: translateY(0); }
}

/* =========================================
 7. INPUTS & CONTROLES
 ========================================= */
.control-group {
  margin-bottom: 20px;
}

label {
  font-size: 13px;
  font-weight: 500;
  display: flex;
  justify-content: space-between;
  margin-bottom: 8px;
  color: var(--text-secondary);
}

input[type="number"] {
  width: 70px;
  padding: 6px 8px;
  border: 1px solid var(--input-border);
  border-radius: 6px;
  text-align: right;
  font-size: 13px;
  background-color: transparent;
  color: var(--text-color);
  transition: border-color 0.2s, box-shadow 0.2s;
}

input[type="number"]:focus {
  outline: none;
  border-color: var(--input-focus);
  box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.2);
}

input[type="range"] {
  width: 100%;
  margin-top: 5px;
  cursor: pointer;
  accent-color: var(--input-focus);
}

/* Boutons d'action */
.action-row {
  display: flex;
  gap: 12px;
  margin-top: 15px;
}

.btn {
  flex: 1;
  padding: 12px;
  border: none;
  border-radius: 8px;
  color: white;
  font-weight: 600;
  font-size: 14px;
  cursor: pointer;
  text-align: center;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.15);
  transition: transform 0.2s, opacity 0.2s, box-shadow 0.2s;
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 15px rgba(0, 0, 0, 0.2);
  opacity: 0.95;
}

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

.btn-go {
  background: linear-gradient(135deg, var(--go-color), #27ae60);
}

.btn-reset {
  background: linear-gradient(135deg, var(--reset-color), #c0392b);
}

.btn-pause {
  background: linear-gradient(135deg, var(--pause-color), #2980b9);
}

/* Checkbox / Radio group */
.checkbox-group {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: 10px;
  font-size: 13px;
  color: var(--text-color);
}
.checkbox-group label {
  margin: 0;
  color: var(--text-color);
  cursor: pointer;
}
input[type="checkbox"], input[type="radio"] {
  accent-color: var(--input-focus);
  cursor: pointer;
}

/* Résultats */
.result-box {
  background: var(--result-bg);
  padding: 15px;
  border-radius: 8px;
  border: 1px solid var(--section-border);
  font-size: 13px;
  line-height: 1.6;
  color: var(--text-color);
  box-shadow: inset 0 2px 5px var(--shadow-color);
}

.result-box ul {
  padding-left: 20px;
  margin: 10px 0 0 0;
}

.result-box li {
  margin-bottom: 5px;
}

.hidden {
  display: none !important;
}

.disabled-by-shape {
  opacity: 0.4;
  pointer-events: none;
}