/**
 * CSS cho ứng dụng Messenger với theme màu hồng
 * Giao diện giống Facebook Messenger web
 */

:root {
  --pink-light: #ffe4e6;      /* Background chính */
  --pink-medium: #fce7f3;      /* Background phụ */
  --pink-dark: #ec4899;        /* Accent hồng đậm */
  --pink-darker: #db2777;      /* Hover states */
  --pink-border: #f9a8d4;      /* Viền hồng */
  --white: #ffffff;
  --gray-light: #f3f4f6;
  --gray-medium: #e5e7eb;
  --gray-dark: #6b7280;
  --gray-darker: #374151;
  --text-primary: #1f2937;
  --text-secondary: #6b7280;
  --shadow: rgba(0, 0, 0, 0.1);
  --shadow-lg: rgba(0, 0, 0, 0.15);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  background: var(--pink-light);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
}

/* ==================== UTILITY CLASSES ==================== */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.btn {
  padding: 10px 20px;
  border: none;
  border-radius: 20px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.btn-primary {
  background: var(--pink-dark);
  color: white;
}

.btn-primary:hover {
  background: var(--pink-darker);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(236, 72, 153, 0.3);
}

.btn-secondary {
  background: var(--white);
  color: var(--pink-dark);
  border: 2px solid var(--pink-dark);
}

.btn-secondary:hover {
  background: var(--pink-light);
}

.input {
  width: 100%;
  padding: 12px 16px;
  border: 2px solid var(--pink-border);
  border-radius: 20px;
  font-size: 14px;
  background: var(--white);
  transition: all 0.2s;
}

.input:focus {
  outline: none;
  border-color: var(--pink-dark);
  box-shadow: 0 0 0 3px rgba(236, 72, 153, 0.1);
}

.card {
  background: var(--white);
  border-radius: 16px;
  padding: 24px;
  box-shadow: 0 2px 8px var(--shadow);
}

.avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  color: white;
  background: var(--pink-dark);
  flex-shrink: 0;
}

.avatar-lg {
  width: 80px;
  height: 80px;
  font-size: 32px;
}

.avatar-xl {
  width: 120px;
  height: 120px;
  font-size: 48px;
}

/* ==================== AUTH PAGES ==================== */
.auth-container {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  background: linear-gradient(135deg, var(--pink-light) 0%, var(--pink-medium) 100%);
}

.auth-card {
  background: var(--white);
  border-radius: 24px;
  padding: 40px;
  width: 100%;
  max-width: 420px;
  box-shadow: 0 10px 40px var(--shadow-lg);
}

.auth-header {
  text-align: center;
  margin-bottom: 32px;
}

.auth-header h1 {
  font-size: 32px;
  color: var(--pink-dark);
  margin-bottom: 8px;
}

.auth-header p {
  color: var(--text-secondary);
  font-size: 14px;
}

.auth-form {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.form-group label {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
}

.form-group .input {
  width: 100%;
}

.auth-footer {
  margin-top: 24px;
  text-align: center;
  font-size: 14px;
  color: var(--text-secondary);
}

.auth-footer a {
  color: var(--pink-dark);
  text-decoration: none;
  font-weight: 600;
}

.auth-footer a:hover {
  text-decoration: underline;
}

.error-message {
  background: #fee2e2;
  color: #dc2626;
  padding: 12px;
  border-radius: 12px;
  font-size: 14px;
  margin-bottom: 16px;
}

/* ==================== MESSENGER LAYOUT ==================== */
.messenger-container {
  display: flex;
  height: 100vh;
  overflow: hidden;
}

/* Sidebar */
.sidebar {
  width: 360px;
  background: var(--white);
  border-right: 1px solid var(--gray-medium);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

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

.sidebar-header-left {
  display: flex;
  align-items: center;
  gap: 12px;
}

.sidebar-header-left .avatar {
  cursor: pointer;
}

.sidebar-header-right {
  display: flex;
  gap: 8px;
}

.icon-btn {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: none;
  background: transparent;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  transition: all 0.2s;
}

.icon-btn:hover {
  background: var(--gray-light);
  color: var(--pink-dark);
}

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

.sidebar-search input {
  width: 100%;
  padding: 10px 16px;
  border: 1px solid var(--gray-medium);
  border-radius: 20px;
  font-size: 14px;
  background: var(--gray-light);
}

.sidebar-search input:focus {
  outline: none;
  background: var(--white);
  border-color: var(--pink-border);
}

.sidebar-tabs {
  display: flex;
  border-bottom: 1px solid var(--gray-medium);
  background: var(--white);
}

.sidebar-tab {
  flex: 1;
  padding: 12px;
  text-align: center;
  border: none;
  background: transparent;
  cursor: pointer;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-secondary);
  border-bottom: 2px solid transparent;
  transition: all 0.2s;
}

.sidebar-tab.active {
  color: var(--pink-dark);
  border-bottom-color: var(--pink-dark);
}

.sidebar-content {
  flex: 1;
  overflow-y: auto;
}

.conversation-list {
  list-style: none;
}

.conversation-item {
  padding: 12px 16px;
  display: flex;
  align-items: center;
  gap: 12px;
  cursor: pointer;
  transition: all 0.2s;
  border-bottom: 1px solid var(--gray-light);
}

.conversation-item:hover {
  background: var(--pink-light);
}

.conversation-item.active {
  background: var(--pink-medium);
}

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

.conversation-item-name {
  font-weight: 600;
  font-size: 14px;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.conversation-item-preview {
  font-size: 13px;
  color: var(--text-secondary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.conversation-item-time {
  font-size: 12px;
  color: var(--text-secondary);
  white-space: nowrap;
}

.friend-list {
  list-style: none;
}

.friend-item {
  padding: 12px 16px;
  display: flex;
  align-items: center;
  gap: 12px;
  cursor: pointer;
  transition: all 0.2s;
  border-bottom: 1px solid var(--gray-light);
}

.friend-item:hover {
  background: var(--pink-light);
}

.friend-item-info {
  flex: 1;
}

.friend-item-name {
  font-weight: 600;
  font-size: 14px;
  color: var(--text-primary);
}

/* Chat Area */
.chat-area {
  flex: 1;
  display: flex;
  flex-direction: column;
  background: var(--pink-light);
  overflow: hidden;
}

.chat-header {
  padding: 12px 20px;
  background: var(--white);
  border-bottom: 1px solid var(--gray-medium);
  display: flex;
  align-items: center;
  gap: 12px;
}

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

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

.chat-header-status {
  font-size: 13px;
  color: var(--text-secondary);
}

.chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.message {
  display: flex;
  gap: 8px;
  max-width: 70%;
  animation: fadeIn 0.2s;
}

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

.message.own {
  align-self: flex-end;
  flex-direction: row-reverse;
}

.message-avatar {
  width: 32px;
  height: 32px;
  flex-shrink: 0;
}

.message-bubble {
  padding: 10px 16px;
  border-radius: 18px;
  font-size: 14px;
  line-height: 1.4;
  word-wrap: break-word;
}

.message.own .message-bubble {
  background: var(--pink-dark);
  color: white;
  border-bottom-right-radius: 4px;
}

.message.other .message-bubble {
  background: var(--white);
  color: var(--text-primary);
  border: 1px solid var(--pink-border);
  border-bottom-left-radius: 4px;
  box-shadow: 0 1px 2px var(--shadow);
}

.message-time {
  font-size: 11px;
  color: var(--text-secondary);
  margin-top: 4px;
  padding: 0 4px;
}

.message.own .message-time {
  text-align: right;
}

.chat-input-area {
  padding: 16px 20px;
  background: var(--white);
  border-top: 1px solid var(--gray-medium);
}

.chat-input-form {
  display: flex;
  gap: 12px;
  align-items: flex-end;
}

.chat-input {
  flex: 1;
  padding: 12px 16px;
  border: 2px solid var(--pink-border);
  border-radius: 24px;
  font-size: 14px;
  font-family: inherit;
  resize: none;
  max-height: 120px;
  background: var(--gray-light);
}

.chat-input:focus {
  outline: none;
  background: var(--white);
  border-color: var(--pink-dark);
}

.send-btn {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: none;
  background: var(--pink-dark);
  color: white;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s;
  flex-shrink: 0;
}

.send-btn:hover {
  background: var(--pink-darker);
  transform: scale(1.05);
}

.send-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

.empty-chat {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  color: var(--text-secondary);
}

.empty-chat i {
  font-size: 64px;
  margin-bottom: 16px;
  color: var(--pink-border);
}

/* ==================== PROFILE PAGE ==================== */
.profile-container {
  min-height: 100vh;
  padding: 40px 20px;
  background: var(--pink-light);
}

.profile-card {
  max-width: 600px;
  margin: 0 auto;
  background: var(--white);
  border-radius: 24px;
  padding: 40px;
  box-shadow: 0 10px 40px var(--shadow-lg);
}

.profile-header {
  text-align: center;
  margin-bottom: 32px;
}

.profile-avatar {
  margin: 0 auto 16px;
}

.profile-name {
  font-size: 28px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.profile-email {
  font-size: 16px;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.profile-joined {
  font-size: 14px;
  color: var(--text-secondary);
}

.profile-bio {
  margin: 32px 0;
  padding: 20px;
  background: var(--pink-light);
  border-radius: 16px;
}

.profile-bio-label {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.profile-bio-text {
  font-size: 15px;
  color: var(--text-primary);
  line-height: 1.6;
}

.profile-form {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.profile-actions {
  display: flex;
  gap: 12px;
  margin-top: 24px;
}

/* ==================== SEARCH USERS ==================== */
.search-users-container {
  padding: 16px;
}

.search-users-form {
  margin-bottom: 16px;
}

.user-search-result {
  padding: 12px 16px;
  display: flex;
  align-items: center;
  gap: 12px;
  border-bottom: 1px solid var(--gray-light);
}

.user-search-result:hover {
  background: var(--pink-light);
}

.user-search-info {
  flex: 1;
}

.user-search-name {
  font-weight: 600;
  font-size: 14px;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.user-search-email {
  font-size: 13px;
  color: var(--text-secondary);
}

/* ==================== FRIEND REQUESTS ==================== */
.friend-requests-container {
  padding: 16px;
}

.friend-request-item {
  padding: 16px;
  display: flex;
  align-items: center;
  gap: 12px;
  border-bottom: 1px solid var(--gray-light);
}

.friend-request-info {
  flex: 1;
}

.friend-request-name {
  font-weight: 600;
  font-size: 14px;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.friend-request-time {
  font-size: 12px;
  color: var(--text-secondary);
}

.friend-request-actions {
  display: flex;
  gap: 8px;
}

.btn-sm {
  padding: 6px 12px;
  font-size: 13px;
}

/* ==================== TOAST NOTIFICATIONS ==================== */
#toast-container {
  position: fixed;
  top: 20px;
  right: 20px;
  z-index: 10000;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.toast {
  background: var(--white);
  padding: 16px 20px;
  border-radius: 12px;
  box-shadow: 0 4px 12px var(--shadow-lg);
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 300px;
  animation: slideIn 0.3s;
}

@keyframes slideIn {
  from {
    transform: translateX(400px);
    opacity: 0;
  }
  to {
    transform: translateX(0);
    opacity: 1;
  }
}

.toast.success {
  border-left: 4px solid #10b981;
}

.toast.error {
  border-left: 4px solid #ef4444;
}

.toast.info {
  border-left: 4px solid var(--pink-dark);
}

.toast-message {
  flex: 1;
  font-size: 14px;
  color: var(--text-primary);
}

/* ==================== RESPONSIVE ==================== */
@media (max-width: 768px) {
  .messenger-container {
    flex-direction: column;
  }
  
  .sidebar {
    width: 100%;
    height: 50vh;
  }
  
  .chat-area {
    height: 50vh;
  }
  
  .message {
    max-width: 85%;
  }
  
  .auth-card {
    padding: 24px;
  }
  
  .profile-card {
    padding: 24px;
  }
}

/* ==================== LOADING STATES ==================== */
.loading {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 40px;
  color: var(--text-secondary);
}

.spinner {
  width: 24px;
  height: 24px;
  border: 3px solid var(--pink-border);
  border-top-color: var(--pink-dark);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}