/* Reset cơ bản */
* { box-sizing: border-box; margin:0; padding:0; }

body {
  font-family: Arial, sans-serif;
  background-color: #f5f5f5;
  color: #333;
}

.container {
  max-width: 800px;
  margin: 50px auto;
  padding: 20px;
  background: #fff;
  border-radius: 8px;
  box-shadow: 0 0 10px rgba(0,0,0,0.1);
}

.login-container { max-width: 400px; }

h1 { color: #2c3e50; margin-bottom: 20px; }

.form-group { margin-bottom: 15px; }
label { display: block; margin-bottom: 5px; font-weight: bold; }
input[type="text"], input[type="password"] {
  width: 100%;
  padding: 10px;
  border: 1px solid #ddd;
  border-radius: 4px;
}

button {
  background-color: #3498db;
  color: #fff;
  border: none;
  padding: 10px 15px;
  border-radius: 4px;
  cursor: pointer;
  font-size: 16px;
}
button:hover { background-color: #2980b9; }
button:disabled { background-color: #ccc; cursor: not-allowed; }
.btn-danger { background-color: #e74c3c; float: right; }

.alert { margin: 10px 0; padding: 10px; border-radius: 4px; }
.alert-danger { background-color: #f8d7da; color: #721c24; border: 1px solid #f5c6cb; }

.upload-area {
  border: 2px dashed #3498db;
  border-radius: 4px;
  padding: 20px;
  text-align: center;
  margin: 20px 0;
  background-color: #f9f9f9;
}
.upload-area.highlight { background-color: #ecf0f1; border-color: #2980b9; }

#preview-canvas { max-width: 100%; }

.file-info {
  margin-top: 10px;
  font-size: 0.85em;
  color: #555;
}

#loading { display: none; text-align: center; margin: 20px 0; }
.spinner {
  border: 4px solid #f3f3f3;
  border-top: 4px solid #3498db;
  border-radius: 50%;
  width: 30px; height: 30px;
  animation: spin 1s linear infinite;
  margin: 0 auto;
}
@keyframes spin { 0% { transform: rotate(0deg) } 100% { transform: rotate(360deg) } }

#result {
  display: none;
  margin-top: 20px;
  padding: 15px;
  background-color: #f9f9f9;
  border-left: 4px solid #3498db;
}
#result-link, #bbcode-link { word-break: break-all; }

.copy-btn {
  background-color: #2ecc71;
  color: #fff;
  border: none;
  padding: 8px 12px;
  border-radius: 4px;
  cursor: pointer;
  font-size: 14px;
}
.copy-btn:hover { background-color: #27ae60; }

#copy-notification {
  display: none;
  margin-left: 10px;
  color: #27ae60;
  animation: fadeout 2s forwards;
  animation-delay: 1s;
}
@keyframes fadeout { from { opacity: 1 } to { opacity: 0 } }

.password-container { position: relative; }
.toggle-password {
  position: absolute;
  right: 10px; top: 10px;
  cursor: pointer; user-select: none;
}

.session-timer { font-size: 0.8em; margin-top: 10px; color: #666; }