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

body {
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  min-height: 100vh;
  direction: rtl;
}

/* صفحه ورود */
.login-container {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.login-card {
  background: white;
  border-radius: 15px;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
  padding: 40px;
  width: 100%;
  max-width: 400px;
}

.login-header {
  text-align: center;
  margin-bottom: 30px;
}

.lock-icon {
  font-size: 48px;
  margin-bottom: 20px;
}

.login-header h1 {
  color: #333;
  margin-bottom: 10px;
  font-size: 24px;
}

.login-header p {
  color: #666;
  font-size: 14px;
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  margin-bottom: 8px;
  color: #333;
  font-weight: 500;
}

.form-group input {
  width: 100%;
  padding: 12px;
  border: 2px solid #e1e5e9;
  border-radius: 8px;
  font-size: 16px;
  transition: border-color 0.3s;
}

.form-group input:focus {
  outline: none;
  border-color: #667eea;
}

.login-btn {
  width: 100%;
  padding: 12px;
  background: #667eea;
  color: white;
  border: none;
  border-radius: 8px;
  font-size: 16px;
  cursor: pointer;
  transition: background 0.3s;
}

.login-btn:hover {
  background: #5a6fd8;
}

.error-message {
  color: #e74c3c;
  background: #fdf2f2;
  padding: 10px;
  border-radius: 5px;
  margin-bottom: 15px;
  text-align: center;
  display: none;
}

/* صفحه چت */
.chat-container {
  height: 100vh;
  display: flex;
  flex-direction: column;
  max-width: 800px;
  margin: 0 auto;
  background: white;
}

.chat-header {
  background: white;
  border-bottom: 1px solid #e1e5e9;
  padding: 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.header-info {
  display: flex;
  align-items: center;
  gap: 15px;
}

.group-icon {
  font-size: 32px;
  background: #f0f4ff;
  padding: 10px;
  border-radius: 50%;
}

.header-info h1 {
  color: #333;
  font-size: 20px;
  margin-bottom: 5px;
}

.header-info p {
  color: #666;
  font-size: 14px;
}

.logout-btn {
  padding: 8px 16px;
  background: #f8f9fa;
  border: 1px solid #e1e5e9;
  border-radius: 6px;
  cursor: pointer;
  transition: background 0.3s;
}

.logout-btn:hover {
  background: #e9ecef;
}

.messages-container {
  flex: 1;
  padding: 20px;
  overflow-y: auto;
  background: #f8f9fa;
}

.message {
  margin-bottom: 15px;
  display: flex;
}

.message.own {
  justify-content: flex-end;
}

.message.system {
  justify-content: center;
}

.message-bubble {
  max-width: 70%;
  padding: 12px 16px;
  border-radius: 18px;
  position: relative;
}

.message-bubble.own {
  background: #667eea;
  color: white;
}

.message-bubble.other {
  background: white;
  border: 1px solid #e1e5e9;
  color: #333;
}

.message-bubble.system {
  background: #e9ecef;
  color: #666;
  text-align: center;
  font-size: 14px;
}

.message-sender {
  font-size: 12px;
  font-weight: 600;
  margin-bottom: 4px;
  color: #666;
}

.message-time {
  font-size: 11px;
  margin-top: 4px;
  opacity: 0.7;
}

.message-input {
  padding: 20px;
  background: white;
  border-top: 1px solid #e1e5e9;
  display: flex;
  gap: 10px;
}

.message-input input {
  flex: 1;
  padding: 12px 16px;
  border: 1px solid #e1e5e9;
  border-radius: 25px;
  font-size: 16px;
}

.message-input input:focus {
  outline: none;
  border-color: #667eea;
}

.send-btn {
  padding: 12px 16px;
  background: #667eea;
  color: white;
  border: none;
  border-radius: 50%;
  cursor: pointer;
  font-size: 16px;
  transition: background 0.3s;
}

.send-btn:hover {
  background: #5a6fd8;
}

/* ریسپانسیو */
@media (max-width: 768px) {
  .chat-container {
    height: 100vh;
  }

  .login-card {
    padding: 30px 20px;
  }

  .message-bubble {
    max-width: 85%;
  }
}

/* دکمه فایل */
.file-btn {
  padding: 12px 16px;
  background: #28a745;
  color: white;
  border: none;
  border-radius: 50%;
  cursor: pointer;
  font-size: 16px;
  transition: background 0.3s;
  margin-left: 5px;
}

.file-btn:hover {
  background: #218838;
}

/* پیام فایل */
.file-message {
  background: #f8f9fa;
  border: 1px solid #dee2e6;
  border-radius: 8px;
  padding: 10px;
  margin: 5px 0;
  display: flex;
  align-items: center;
  gap: 10px;
}

.file-icon {
  font-size: 24px;
}

.file-info {
  flex: 1;
}

.file-name {
  font-weight: 600;
  color: #333;
  margin-bottom: 2px;
}

.file-size {
  font-size: 12px;
  color: #666;
}

.file-download {
  background: #007bff;
  color: white;
  border: none;
  padding: 5px 10px;
  border-radius: 4px;
  cursor: pointer;
  font-size: 12px;
}

.file-download:hover {
  background: #0056b3;
}

/* تصاویر در چت */
.chat-image {
  max-width: 200px;
  max-height: 200px;
  border-radius: 8px;
  cursor: pointer;
  margin: 5px 0;
}

/* نوتیفیکیشن */
.notification-permission {
  background: #fff3cd;
  border: 1px solid #ffeaa7;
  color: #856404;
  padding: 10px;
  border-radius: 5px;
  margin: 10px;
  text-align: center;
}

.notification-permission button {
  background: #ffc107;
  border: none;
  padding: 5px 15px;
  border-radius: 3px;
  cursor: pointer;
  margin-right: 10px;
}

/* لودینگ آپلود */
.upload-progress {
  background: #e9ecef;
  border-radius: 10px;
  height: 4px;
  margin: 5px 0;
  overflow: hidden;
}

.upload-progress-bar {
  background: #007bff;
  height: 100%;
  transition: width 0.3s;
}