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

/* Dark Mode Variables */
:root {
  --bg-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --bg-secondary: #ffffff;
  --bg-tertiary: #f5f5f5;
  --bg-messages: #fafafa;
  --text-primary: #333333;
  --text-secondary: #666666;
  --text-muted: #999999;
  --text-inverse: #ffffff;
  --border-color: #e0e0e0;
  --shadow-color: rgba(0,0,0,0.2);
  --accent-color: #667eea;
  --accent-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --danger-color: #f44336;
  --success-color: #4caf50;
  --warning-color: #ff9800;
  --input-bg: #ffffff;
  --spinner-bg: #f3f3f3;
  --info-bg: #e3f2fd;
  --info-color: #1976d2;
  --message-bg: #ffffff;
}

[data-theme="dark"] {
  --bg-primary: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
  --bg-secondary: #1e1e2e;
  --bg-tertiary: #2a2a3e;
  --bg-messages: #252535;
  --text-primary: #e0e0e0;
  --text-secondary: #a0a0a0;
  --text-muted: #707070;
  --text-inverse: #1e1e2e;
  --border-color: #3a3a4e;
  --shadow-color: rgba(0,0,0,0.5);
  --accent-color: #7c3aed;
  --accent-gradient: linear-gradient(135deg, #7c3aed 0%, #a855f7 100%);
  --danger-color: #ef4444;
  --success-color: #22c55e;
  --warning-color: #fbbf24;
  --input-bg: #2a2a3e;
  --spinner-bg: #3a3a4e;
  --info-bg: #1e3a5f;
  --info-color: #60a5fa;
  --message-bg: #2a2a3e;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Arial, sans-serif;
  background: var(--bg-primary);
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  color: var(--text-primary);
  transition: background 0.3s ease;
}

.container {
  background: var(--bg-secondary);
  border-radius: 12px;
  box-shadow: 0 10px 40px var(--shadow-color);
  max-width: 600px;
  width: 100%;
  overflow: hidden;
}

.header {
  background: var(--accent-gradient);
  color: var(--text-inverse);
  padding: 20px;
  text-align: center;
}

.header h1 {
  font-size: 24px;
  font-weight: 600;
  margin-bottom: 8px;
}

.user-info-header {
  font-size: 13px;
  opacity: 0.9;
  font-weight: 400;
}

.content {
  padding: 30px;
  background: var(--bg-secondary);
}

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

.form-group label {
  display: block;
  margin-bottom: 8px;
  color: var(--text-primary);
  font-weight: 500;
  font-size: 14px;
}

input[type="text"],
input[type="email"],
input[type="password"],
textarea {
  width: 100%;
  padding: 12px 15px;
  border: 2px solid var(--border-color);
  border-radius: 8px;
  font-size: 15px;
  transition: border-color 0.3s;
  font-family: inherit;
  background: var(--input-bg);
  color: var(--text-primary);
}

input[type="text"]:focus,
input[type="email"]:focus,
input[type="password"]:focus,
textarea:focus {
  outline: none;
  border-color: var(--accent-color);
}

textarea {
  resize: vertical;
  min-height: 80px;
}

.btn {
  padding: 12px 24px;
  border: none;
  border-radius: 8px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s;
  width: 100%;
  margin-top: 10px;
}

.btn-primary {
  background: var(--accent-gradient);
  color: var(--text-inverse);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
}

.btn-secondary {
  background: var(--bg-tertiary);
  color: var(--text-primary);
}

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

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

.btn-danger:hover {
  background: #d32f2f;
}

.btn-small {
  padding: 8px 16px;
  font-size: 13px;
}

/* Tab Navigation */
.tabs {
  display: flex;
  border-bottom: 2px solid var(--border-color);
  background: var(--bg-tertiary);
}

.tab-btn {
  flex: 1;
  padding: 15px;
  border: none;
  background: transparent;
  color: var(--text-secondary);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s;
  border-bottom: 3px solid transparent;
}

.tab-btn span {
  margin-right: 5px;
}

.tab-btn:hover {
  background: var(--bg-messages);
  color: var(--text-primary);
}

.tab-btn.active {
  color: var(--accent-color);
  border-bottom-color: var(--accent-color);
  background: var(--bg-secondary);
}

.tab-content {
  display: block;
}

.tab-content.hidden {
  display: none;
}

/* Chat Area */
.chat-header {
  padding: 15px;
  background: var(--bg-tertiary);
  border-radius: 8px;
  margin-bottom: 15px;
}

.chat-header h3 {
  font-size: 16px;
  color: var(--text-primary);
  font-weight: 600;
}

/* DM Chat Header */
.dm-chat-header {
  display: flex;
  align-items: center;
  gap: 12px;
}

.back-btn {
  background: var(--bg-secondary);
  border: 2px solid var(--border-color);
  color: var(--accent-color);
  width: 40px;
  height: 40px;
  border-radius: 50%;
  font-size: 20px;
  font-weight: bold;
  cursor: pointer;
  transition: all 0.3s;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.back-btn:hover {
  background: var(--accent-color);
  color: white;
  border-color: var(--accent-color);
}

.dm-chat-info {
  flex: 1;
}

.dm-chat-info h3 {
  font-size: 16px;
  color: var(--text-primary);
  font-weight: 600;
}

/* DM List Header */
.dm-list-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
  padding-bottom: 15px;
  border-bottom: 2px solid var(--border-color);
}

.dm-list-header h3 {
  font-size: 18px;
  color: var(--text-primary);
  font-weight: 600;
  margin: 0;
}

.dm-chat-list {
  margin-top: 15px;
}

#messages,
#dmMessages,
#groupMessages {
  height: 350px;
  overflow-y: auto;
  border: 2px solid var(--border-color);
  border-radius: 8px;
  padding: 15px;
  margin-bottom: 15px;
  background: var(--bg-messages);
}

.message {
  padding: 10px 12px;
  margin-bottom: 10px;
  border-radius: 8px;
  background: var(--message-bg);
  box-shadow: 0 1px 3px rgba(0,0,0,0.1);
  word-wrap: break-word;
}

[data-theme="dark"] .message {
  box-shadow: 0 1px 3px rgba(0,0,0,0.3);
}

.message .username {
  font-weight: 600;
  color: var(--accent-color);
  margin-right: 8px;
}

.message .text {
  color: var(--text-primary);
}

.message .time {
  font-size: 11px;
  color: var(--text-muted);
  margin-left: 8px;
}

.input-group {
  display: flex;
  gap: 10px;
}

.input-group input {
  flex: 1;
}

.input-group button {
  width: auto;
  padding: 12px 24px;
  margin: 0;
}

/* DM Placeholder */
.dm-placeholder {
  text-align: center;
  padding: 60px 30px;
}

.placeholder-icon {
  font-size: 64px;
  margin-bottom: 20px;
  opacity: 0.5;
}

.dm-placeholder h3 {
  font-size: 20px;
  color: var(--text-primary);
  margin-bottom: 10px;
}

.dm-placeholder p {
  color: var(--text-secondary);
  margin-bottom: 25px;
  font-size: 14px;
}

/* Unread Badge */
.unread-badge {
  background: var(--danger-color);
  color: white;
  border-radius: 12px;
  padding: 2px 8px;
  font-size: 11px;
  font-weight: 700;
  min-width: 20px;
  text-align: center;
  animation: badgePop 0.3s ease;
}

@keyframes badgePop {
  0% { transform: scale(0); }
  50% { transform: scale(1.2); }
  100% { transform: scale(1); }
}

/* Mute Menu Styles */
.mute-menu {
  position: fixed;
  background: var(--bg-secondary);
  border-radius: 8px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
  min-width: 200px;
  z-index: 1000;
  animation: menuSlideIn 0.2s ease;
  overflow: hidden;
}

@keyframes menuSlideIn {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.mute-menu-item {
  padding: 12px 16px;
  cursor: pointer;
  transition: background 0.2s;
  font-size: 14px;
  color: var(--text-primary);
  border-bottom: 1px solid var(--border-color);
}

.mute-menu-item:last-child {
  border-bottom: none;
}

.mute-menu-item:hover {
  background: var(--bg-tertiary);
}

.mute-menu-item:active {
  background: var(--border-color);
}

/* Mute Notification Toast */
.mute-notification {
  position: fixed;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  background: var(--bg-tertiary);
  color: var(--text-primary);
  padding: 12px 24px;
  border-radius: 8px;
  font-size: 14px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
  z-index: 2000;
  opacity: 0;
  transition: all 0.3s ease;
}

.mute-notification.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* Muted Badge */
.muted-badge {
  display: inline-flex;
  align-items: center;
  background: var(--warning-color);
  color: white;
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 11px;
  font-weight: 600;
  margin-left: 8px;
}

/* Mute Buttons in Chat Header */
#muteChatBtn,
#muteChatBtnDM {
  background: var(--bg-secondary);
  border: 2px solid var(--border-color);
  color: var(--text-secondary);
  width: 40px;
  height: 40px;
  border-radius: 50%;
  font-size: 20px;
  cursor: pointer;
  transition: all 0.3s;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

#muteChatBtn:hover,
#muteChatBtnDM:hover {
  background: var(--bg-tertiary);
  border-color: var(--accent-color);
}

#muteChatBtn:active,
#muteChatBtnDM:active {
  transform: scale(0.95);
}

/* Role Badges */
.role-badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  margin-left: 6px;
}

.role-badge.creator {
  background: linear-gradient(135deg, #ffd700 0%, #ffed4e 100%);
  color: #7d5a00;
  border: 1px solid #ffd700;
}

.role-badge.admin {
  background: var(--accent-gradient);
  color: white;
  border: 1px solid var(--accent-color);
}

/* Members Count */
.members-count {
  margin-top: 20px;
  padding: 15px;
  background: var(--bg-tertiary);
  border-radius: 8px;
  text-align: center;
  font-size: 14px;
  color: var(--text-secondary);
}

.members-count strong {
  color: var(--text-primary);
  font-size: 16px;
}

/* Modal */
.modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.6);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: 20px;
}

.modal.hidden {
  display: none;
}

.modal-content {
  background: var(--bg-secondary);
  border-radius: 12px;
  max-width: 500px;
  width: 100%;
  max-height: 80vh;
  overflow: hidden;
  box-shadow: 0 20px 60px rgba(0,0,0,0.3);
  animation: modalSlideIn 0.3s ease;
}

@keyframes modalSlideIn {
  from {
    transform: translateY(-50px);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

.modal-header {
  background: var(--accent-gradient);
  color: white;
  padding: 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.modal-header h2 {
  font-size: 20px;
  font-weight: 600;
}

.close-btn {
  background: none;
  border: none;
  color: white;
  font-size: 32px;
  cursor: pointer;
  line-height: 1;
  padding: 0;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  transition: background 0.3s;
}

.close-btn:hover {
  background: rgba(255, 255, 255, 0.2);
}

.modal-body {
  padding: 20px;
  max-height: calc(80vh - 80px);
  overflow-y: auto;
}

/* User List */
.user-list {
  margin-top: 15px;
}

.user-item {
  display: flex;
  align-items: center;
  padding: 12px 15px;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.3s;
  border: 2px solid transparent;
  margin-bottom: 8px;
}

.user-item:hover {
  background: var(--bg-tertiary);
  border-color: var(--accent-color);
}

.user-item.no-hover {
  cursor: default;
}

.user-item.no-hover:hover {
  background: transparent;
  border-color: transparent;
}

.user-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--accent-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 600;
  font-size: 18px;
  margin-right: 12px;
  flex-shrink: 0;
}

.user-details {
  flex: 1;
}

.user-username {
  font-weight: 600;
  color: var(--text-primary);
  font-size: 15px;
}

.user-email {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 2px;
}

.no-users {
  text-align: center;
  padding: 40px 20px;
  color: var(--text-muted);
  font-size: 14px;
}

/* Footer */
.chat-footer {
  padding: 15px 30px;
  background: var(--bg-tertiary);
  border-top: 1px solid var(--border-color);
  text-align: center;
}

.hidden {
  display: none;
}

.error {
  color: var(--danger-color);
  font-size: 13px;
  margin-top: 5px;
}

.info {
  background: var(--info-bg);
  color: var(--info-color);
  padding: 12px;
  border-radius: 8px;
  margin-bottom: 20px;
  font-size: 14px;
}

/* Loading Spinner */
.spinner {
  border: 3px solid var(--spinner-bg);
  border-top: 3px solid var(--accent-color);
  border-radius: 50%;
  width: 30px;
  height: 30px;
  animation: spin 1s linear infinite;
  margin: 20px auto;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

/* Dark Mode Toggle Button */
#themeToggle {
  background: none;
  border: none;
  font-size: 24px;
  cursor: pointer;
  padding: 5px;
  transition: transform 0.3s ease;
}

#themeToggle:hover {
  transform: scale(1.1);
}

/* Responsive */
@media (max-width: 600px) {
  .content {
    padding: 20px;
  }
  
  #messages,
  #dmMessages,
  #groupMessages {
    height: 300px;
  }
  
  .tab-btn {
    font-size: 13px;
    padding: 12px;
  }
  
  .dm-placeholder {
    padding: 40px 20px;
  }
  
  .modal-content {
    max-height: 90vh;
  }
  
  .dm-chat-header {
    flex-wrap: wrap;
  }
  
  .dm-chat-header .btn-small {
    width: 100%;
    margin-top: 10px;
  }
  
  .mute-menu {
    min-width: 180px;
  }
  
  .mute-notification {
    bottom: 20px;
    max-width: 90%;
    font-size: 13px;
  }
}

/* Read Receipts */
.read-receipt {
  font-size: 11px;
  color: #4caf50;
  margin-left: 8px;
}

[data-theme="dark"] .read-receipt {
  color: #22c55e;
}

/* Own messages - different background */
.message.my-message {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.message.my-message .username {
  color: rgba(255, 255, 255, 0.9);
}

.message.my-message .text {
  color: white;
}

.message.my-message .time {
  color: rgba(255, 255, 255, 0.7);
}

.message.my-message .read-receipt {
  color: #90EE90;
}

/* Message Reactions */
.message-reactions {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  margin-top: 6px;
  align-items: center;
}

.reaction-badge {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 2px 6px;
  font-size: 12px;
  cursor: pointer;
  transition: background 0.2s;
}

.reaction-badge:hover {
  background: var(--border-color);
}

.react-btn {
  background: none;
  border: none;
  cursor: pointer;
  font-size: 14px;
  opacity: 0.5;
  transition: opacity 0.2s;
  padding: 2px 4px;
}

.react-btn:hover {
  opacity: 1;
}

.reaction-picker {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 4px;
  box-shadow: 0 2px 10px rgba(0,0,0,0.2);
  display: flex;
  gap: 2px;
}

.reaction-picker .reaction-emoji {
  background: none;
  border: none;
  font-size: 18px;
  cursor: pointer;
  padding: 4px;
  border-radius: 4px;
  transition: background 0.2s;
}

.reaction-picker .reaction-emoji:hover {
  background: var(--bg-tertiary);
}


/* User Settings Modal */
.settings-section {
  margin-bottom: 24px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border-color);
}

.settings-section:last-child {
  border-bottom: none;
}

.settings-section h3 {
  margin-bottom: 8px;
  font-size: 16px;
  color: var(--text-primary);
}

.settings-description {
  color: var(--text-secondary);
  font-size: 13px;
  margin-bottom: 12px;
}

.radio-group {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.radio-label {
  display: flex;
  flex-direction: column;
  padding: 12px;
  background: var(--bg-secondary);
  border-radius: 8px;
  cursor: pointer;
  transition: background 0.2s;
}

.radio-label:hover {
  background: var(--bg-tertiary);
}

.radio-label input[type="radio"] {
  margin-bottom: 4px;
  accent-color: var(--primary-color);
}

.radio-label span:first-of-type {
  font-weight: 500;
}

.radio-desc {
  font-size: 12px;
  color: var(--text-secondary);
  margin-top: 2px;
}

.toggle-label {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px;
  background: var(--bg-secondary);
  border-radius: 8px;
}

.toggle-label input[type="checkbox"] {
  width: 20px;
  height: 20px;
  accent-color: var(--primary-color);
}

/* Blocked Users List */
.blocked-list {
  max-height: 200px;
  overflow-y: auto;
}

.blocked-user-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px;
  background: var(--bg-secondary);
  border-radius: 8px;
  margin-bottom: 8px;
}

.blocked-user-item span {
  font-weight: 500;
}

.no-blocked {
  color: var(--text-secondary);
  text-align: center;
  padding: 20px;
}