:root {
  --bg-color: #f4f7f6;
  --card-bg: #ffffff;
  --text-color: #333333;
  --text-muted: #666666;
  --drop-bg: #f8f9fa;
  --drop-hover: #e9ecef;
  --border-color: #007bff;
  --input-bg: #ffffff;
  --input-border: #ccc;
  --btn-bg: #007bff;
  --btn-hover: #0056b3;
  --success-bg: #28a745;
  --success-hover: #218838;
}

/* Variables pour le thème sombre (par défaut) */
body.dark-theme {
  --bg-color: #121212;
  --card-bg: #1e1e1e;
  --text-color: #e0e0e0;
  --text-muted: #a0a0a0;
  --drop-bg: #2a2a2a;
  --drop-hover: #333333;
  --border-color: #3700b3;
  --input-bg: #2a2a2a;
  --input-border: #444444;
  --btn-bg: #bb86fc;
  --btn-hover: #9955e8;
  --success-bg: #03dac6;
  --success-hover: #00b3a1;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  transition: background-color 0.3s ease, color 0.3s ease;
}

body {
  background-color: var(--bg-color);
  color: var(--text-color);
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  padding: 20px;
}

.converter-container {
  background: var(--card-bg);
  padding: 30px;
  border-radius: 12px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
  width: 100%;
  max-width: 500px;
  text-align: center;
  position: relative;
}

.theme-toggle {
  position: absolute;
  top: 15px;
  right: 15px;
}

.theme-toggle button {
  background: transparent;
  border: none;
  font-size: 1.2rem;
  cursor: pointer;
  padding: 5px;
  border-radius: 50%;
}

h1 {
  margin-bottom: 10px;
  font-size: 1.6rem;
}

p {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-bottom: 20px;
}

.drop-zone {
  border: 2px dashed var(--btn-bg);
  padding: 30px 20px;
  border-radius: 8px;
  background-color: var(--drop-bg);
  cursor: pointer;
}

.drop-zone:hover {
  background-color: var(--drop-hover);
}

.drop-zone span {
  color: var(--btn-bg);
  font-weight: bold;
}

.file-info {
  margin-top: 20px;
  text-align: left;
}

#fileListPreview {
  max-height: 100px;
  overflow-y: auto;
  font-size: 0.85rem;
  margin: 10px 0;
  padding-left: 20px;
  color: var(--text-muted);
}

.options {
  margin: 15px 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

select {
  padding: 8px 12px;
  border-radius: 6px;
  background-color: var(--input-bg);
  color: var(--text-color);
  border: 1px solid var(--input-border);
  font-size: 1rem;
}

.btn {
  display: block;
  width: 100%;
  padding: 12px;
  background-color: var(--btn-bg);
  color: #fff;
  border: none;
  border-radius: 6px;
  font-size: 1rem;
  font-weight: bold;
  cursor: pointer;
  text-align: center;
  text-decoration: none;
}

body.dark-theme .btn {
  color: #000; /* Meilleur contraste en mode sombre */
}

.btn:hover {
  background-color: var(--btn-hover);
}

.download-btn {
  background-color: var(--success-bg);
  margin-top: 15px;
}

.download-btn:hover {
  background-color: var(--success-hover);
}

.status {
  margin-top: 15px;
  font-weight: bold;
  font-size: 0.9rem;
}