:root {
  --bg-base: #0f172a;
  --bg-sidebar: #1e293b;
  --bg-chat: #0f172a;
  --bg-card: #1e293b;
  --bg-input: #334155;
  --bg-hover: #334155;
  --bg-active: #475569;
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  --primary: #3b82f6;
  --primary-hover: #2563eb;
  --success: #10b981;
  --danger: #ef4444;
  --warning: #f59e0b;
  --border: #334155;
  --radius: 8px;
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

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

body {
  font-family: var(--font-family);
  background: var(--bg-base);
  color: var(--text-main);
  height: 100vh;
  overflow: hidden;
  -webkit-font-smoothing: antialiased;
}

/* AUTH CONTAINER */
.auth-container {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100vh;
  background: radial-gradient(circle at 50% 30%, #1e293b 0%, #0f172a 100%);
  padding: 20px;
}

.auth-card {
  width: 100%;
  max-width: 420px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 32px;
  box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.5), 0 8px 10px -6px rgba(0, 0, 0, 0.5);
}

.brand-header {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 24px;
}

.brand-logo {
  background: var(--primary);
  color: #fff;
  width: 48px;
  height: 48px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.brand-text h1 {
  font-size: 22px;
  font-weight: 700;
  letter-spacing: 0.5px;
}

.brand-text p {
  font-size: 13px;
  color: var(--text-muted);
}

.brand-badge {
  background: var(--primary);
  color: #fff;
  font-size: 12px;
  font-weight: 700;
  padding: 4px 8px;
  border-radius: 6px;
  letter-spacing: 0.5px;
}

.auth-tabs {
  display: flex;
  border-bottom: 1px solid var(--border);
  margin-bottom: 20px;
}

.tab-btn {
  flex: 1;
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 14px;
  font-weight: 600;
  padding: 10px;
  cursor: pointer;
  border-bottom: 2px solid transparent;
  transition: all 0.2s;
}

.tab-btn.active {
  color: var(--primary);
  border-bottom-color: var(--primary);
}

.form-group {
  margin-bottom: 16px;
}

.form-group label {
  display: block;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-muted);
  margin-bottom: 6px;
}

.form-group input[type="text"],
.form-group input[type="email"],
.form-group input[type="password"] {
  width: 100%;
  padding: 10px 14px;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: #fff;
  font-size: 14px;
  outline: none;
  transition: border-color 0.2s;
}

.form-group input:focus {
  border-color: var(--primary);
}

.checkbox-group label {
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  color: var(--text-main);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 18px;
  font-size: 14px;
  font-weight: 600;
  border-radius: var(--radius);
  border: none;
  cursor: pointer;
  transition: all 0.2s;
}

.btn-primary {
  background: var(--primary);
  color: #fff;
}

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

.btn-secondary {
  background: var(--bg-input);
  color: var(--text-main);
}

.btn-secondary:hover {
  background: var(--bg-active);
}

.btn-outline {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-muted);
}

.btn-outline:hover {
  color: var(--text-main);
  border-color: var(--text-muted);
}

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

.btn-block {
  width: 100%;
}

.btn-sm {
  padding: 6px 12px;
  font-size: 12px;
}

.alert-error {
  background: rgba(239, 68, 68, 0.15);
  border: 1px solid var(--danger);
  color: #fca5a5;
  padding: 10px 14px;
  border-radius: var(--radius);
  font-size: 13px;
  margin-bottom: 16px;
}

/* MAIN APP LAYOUT */
.app-layout {
  display: flex;
  height: 100vh;
  width: 100vw;
  overflow: hidden;
}

/* SIDEBAR */
.sidebar {
  width: 290px;
  background: var(--bg-sidebar);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  transition: transform 0.3s ease;
  z-index: 50;
}

.sidebar-header {
  padding: 16px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border);
}

.sidebar-brand {
  display: flex;
  align-items: center;
  gap: 10px;
}

.conn-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  display: inline-block;
}

.conn-dot.connected {
  background: var(--success);
  box-shadow: 0 0 6px var(--success);
}

.conn-dot.disconnected {
  background: var(--danger);
}

.sidebar-search {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
}

.sidebar-search input {
  width: 100%;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 8px 12px;
  color: #fff;
  font-size: 13px;
  outline: none;
}

.sidebar-scrollable {
  flex: 1;
  overflow-y: auto;
  padding: 12px 0;
}

.sidebar-section {
  margin-bottom: 18px;
}

.section-title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 4px 18px 8px 18px;
  font-size: 11px;
  font-weight: 700;
  color: var(--text-dim);
  letter-spacing: 0.5px;
}

.add-btn {
  background: none;
  border: none;
  color: var(--text-dim);
  font-size: 18px;
  cursor: pointer;
  line-height: 1;
  padding: 2px 6px;
  border-radius: 4px;
}

.add-btn:hover {
  color: #fff;
  background: var(--bg-hover);
}

.items-list {
  display: flex;
  flex-direction: column;
}

.chat-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 8px 16px;
  cursor: pointer;
  border-left: 3px solid transparent;
  transition: all 0.15s;
}

.chat-item:hover {
  background: var(--bg-hover);
}

.chat-item.active {
  background: var(--bg-active);
  border-left-color: var(--primary);
}

.item-avatar {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  font-size: 13px;
  color: #fff;
  position: relative;
  flex-shrink: 0;
}

.online-badge {
  position: absolute;
  bottom: -2px;
  right: -2px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  border: 2px solid var(--bg-sidebar);
}

.online-badge.online {
  background: var(--success);
}

.online-badge.offline {
  background: var(--text-dim);
}

.item-content {
  flex: 1;
  min-width: 0;
}

.item-name {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-main);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.item-preview {
  font-size: 12px;
  color: var(--text-dim);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* SIDEBAR FOOTER */
.sidebar-footer {
  padding: 14px 16px;
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 12px;
  background: #182234;
}

.user-avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--primary);
  color: #fff;
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 15px;
  flex-shrink: 0;
}

.user-info {
  flex: 1;
  min-width: 0;
}

.user-name {
  display: block;
  font-size: 14px;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.user-role {
  font-size: 11px;
  color: var(--text-dim);
  text-transform: uppercase;
  font-weight: 700;
}

.user-role.admin {
  color: #fbbf24;
}

.footer-actions {
  display: flex;
  gap: 6px;
}

.icon-btn {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 8px;
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s;
  font-size: 16px;
}

.icon-btn:hover {
  color: #fff;
  background: var(--bg-hover);
}

.mobile-menu-btn,
.mobile-close-btn {
  display: none;
}

/* CHAT AREA */
.chat-area {
  flex: 1;
  display: flex;
  flex-direction: column;
  background: var(--bg-chat);
  height: 100vh;
  position: relative;
  min-width: 0;
}

.chat-header {
  padding: 14px 24px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: #111a2e;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 14px;
}

.chat-avatar {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background: var(--bg-input);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 18px;
  color: #fff;
}

.chat-header h2 {
  font-size: 16px;
  font-weight: 700;
}

.chat-header p {
  font-size: 12px;
  color: var(--text-muted);
}

/* MESSAGES STREAM */
.messages-container {
  flex: 1;
  overflow-y: auto;
  padding: 20px 24px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.empty-state {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100%;
  color: var(--text-dim);
  font-size: 15px;
}

.message-row {
  display: flex;
  gap: 14px;
  position: relative;
  padding: 4px 8px;
  border-radius: 8px;
  transition: background 0.15s;
}

.message-row:hover {
  background: rgba(51, 65, 85, 0.4);
}

.msg-avatar {
  width: 38px;
  height: 38px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 600;
  font-size: 14px;
  flex-shrink: 0;
}

.msg-body {
  flex: 1;
  min-width: 0;
}

.msg-header {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin-bottom: 4px;
}

.msg-author {
  font-size: 14px;
  font-weight: 700;
  color: var(--text-main);
}

.msg-role-tag {
  font-size: 10px;
  background: #fbbf24;
  color: #000;
  font-weight: 700;
  padding: 1px 5px;
  border-radius: 4px;
  text-transform: uppercase;
}

.msg-time {
  font-size: 11px;
  color: var(--text-dim);
}

.msg-content {
  font-size: 14px;
  line-height: 1.5;
  color: #e2e8f0;
  word-break: break-word;
}

.msg-content.deleted {
  font-style: italic;
  color: var(--text-dim);
}

.edited-tag {
  font-size: 11px;
  color: var(--text-dim);
  margin-left: 6px;
}

/* File Attachments */
.msg-attachment {
  margin-top: 8px;
}

.msg-img-preview {
  max-width: 320px;
  max-height: 260px;
  border-radius: 8px;
  border: 1px solid var(--border);
  display: block;
}

.msg-file-download {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  padding: 8px 14px;
  border-radius: 6px;
  color: var(--text-main);
  text-decoration: none;
  font-size: 13px;
}

.msg-file-download:hover {
  border-color: var(--primary);
}

/* Reactions */
.msg-reactions {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 6px;
}

.reaction-badge {
  background: var(--bg-card);
  border: 1px solid var(--border);
  padding: 2px 8px;
  border-radius: 12px;
  font-size: 12px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  transition: all 0.15s;
}

.reaction-badge:hover,
.reaction-badge.my-reaction {
  border-color: var(--primary);
  background: rgba(59, 130, 246, 0.15);
}

/* Message Hover Actions */
.msg-actions {
  position: absolute;
  top: -8px;
  right: 12px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 6px;
  display: none;
  padding: 2px;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.4);
}

.message-row:hover .msg-actions {
  display: flex;
}

.msg-act-btn {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 4px 8px;
  font-size: 14px;
  border-radius: 4px;
}

.msg-act-btn:hover {
  background: var(--bg-hover);
  color: #fff;
}

/* Inline Edit Box */
.inline-edit-box {
  margin-top: 6px;
}

.inline-edit-box textarea {
  width: 100%;
  background: var(--bg-input);
  border: 1px solid var(--primary);
  border-radius: 6px;
  padding: 8px 12px;
  color: #fff;
  font-size: 14px;
  outline: none;
  resize: vertical;
}

.inline-edit-actions {
  display: flex;
  gap: 8px;
  margin-top: 6px;
}

/* TYPING INDICATOR */
.typing-indicator {
  padding: 4px 24px;
  font-size: 12px;
  color: var(--text-dim);
  min-height: 22px;
}

/* CHAT INPUT BAR */
.chat-input-bar {
  padding: 12px 24px 20px 24px;
  display: flex;
  align-items: flex-end;
  gap: 12px;
  background: #111a2e;
  border-top: 1px solid var(--border);
}

.input-action-btn {
  font-size: 20px;
  padding: 8px 10px;
}

.input-wrapper {
  flex: 1;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px 14px;
  display: flex;
  transition: border-color 0.2s;
}

.input-wrapper:focus-within {
  border-color: var(--primary);
}

.input-wrapper textarea {
  width: 100%;
  background: transparent;
  border: none;
  color: #fff;
  font-family: inherit;
  font-size: 14px;
  outline: none;
  resize: none;
  max-height: 140px;
  line-height: 1.4;
}

.send-btn {
  padding: 10px 20px;
  height: 42px;
}

/* MODALS */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.7);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  padding: 20px;
}

.modal-card {
  width: 100%;
  max-width: 480px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px;
  box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.6);
}

.modal-large {
  max-width: 850px;
  max-height: 85vh;
  display: flex;
  flex-direction: column;
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
}

.brand-inline {
  display: flex;
  align-items: center;
  gap: 10px;
}

.close-btn {
  background: none;
  border: none;
  color: var(--text-dim);
  font-size: 20px;
  cursor: pointer;
}

.close-btn:hover {
  color: #fff;
}

.modal-actions {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
  margin-top: 24px;
}

/* User search list */
.user-search-list {
  max-height: 280px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.user-search-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 8px 12px;
  background: var(--bg-input);
  border-radius: 6px;
  cursor: pointer;
  transition: background 0.15s;
}

.user-search-item:hover {
  background: var(--bg-active);
}

/* ADMIN CONSOLE */
.admin-tabs {
  display: flex;
  gap: 8px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 18px;
}

.admin-tab-btn {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 14px;
  font-weight: 600;
  padding: 8px 14px;
  cursor: pointer;
  border-bottom: 2px solid transparent;
}

.admin-tab-btn.active {
  color: var(--primary);
  border-bottom-color: var(--primary);
}

.admin-subbar {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 14px;
}

.admin-subbar input {
  flex: 1;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 6px 12px;
  color: #fff;
  font-size: 13px;
  outline: none;
}

.table-responsive {
  overflow-x: auto;
  max-height: 480px;
}

.admin-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}

.admin-table th,
.admin-table td {
  padding: 10px 12px;
  text-align: left;
  border-bottom: 1px solid var(--border);
}

.admin-table th {
  color: var(--text-muted);
  font-weight: 600;
  background: #182234;
  position: sticky;
  top: 0;
}

.admin-table tr:hover td {
  background: rgba(51, 65, 85, 0.3);
}

.badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 11px;
  font-weight: 600;
}

.badge-admin {
  background: #f59e0b;
  color: #000;
}

.badge-user {
  background: var(--bg-input);
  color: var(--text-muted);
}

.badge-active {
  background: rgba(16, 185, 129, 0.2);
  color: #34d399;
}

.badge-banned {
  background: rgba(239, 68, 68, 0.2);
  color: #f87171;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 16px;
  padding: 10px 0;
}

.stat-card {
  background: var(--bg-input);
  padding: 20px;
  border-radius: 10px;
  border: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.stat-num {
  font-size: 28px;
  font-weight: 700;
  color: var(--primary);
}

.stat-label {
  font-size: 12px;
  color: var(--text-muted);
}

/* RESPONSIVE */
@media (max-width: 768px) {
  .sidebar {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    transform: translateX(-100%);
  }

  .sidebar.open {
    transform: translateX(0);
  }

  .mobile-menu-btn,
  .mobile-close-btn {
    display: flex;
  }
}