/* Complete Webmail Interface Styles */

:root {
  --primary-color: #2563eb;
  --secondary-color: #64748b;
  --success-color: #10b981;
  --warning-color: #f59e0b;
  --error-color: #ef4444;
  --bg-primary: #ffffff;
  --bg-secondary: #f8fafc;
  --bg-tertiary: #f1f5f9;
  --text-primary: #1e293b;
  --text-secondary: #64748b;
  --text-tertiary: #94a3b8;
  --border-color: #e2e8f0;
  --border-focus: #3b82f6;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

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

body {
  font-family: var(--font-sans);
  font-size: 14px;
  line-height: 1.5;
  color: var(--text-primary);
  background-color: var(--bg-secondary);
  height: 100vh;
  overflow: hidden;
}

/* Utility Classes */
.hidden {
  display: none !important;
}

.text-center {
  text-align: center;
}

.text-right {
  text-align: right;
}

.flex {
  display: flex;
}

.flex-col {
  flex-direction: column;
}

.items-center {
  align-items: center;
}

.justify-between {
  justify-content: space-between;
}

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

.gap-2 {
  gap: 0.5rem;
}

.gap-4 {
  gap: 1rem;
}

.w-full {
  width: 100%;
}

.h-full {
  height: 100%;
}

/* Screen System */
.screen {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Authentication Screen */
.auth-container {
  width: 100%;
  max-width: 480px;
  padding: 2rem;
  background: var(--bg-primary);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  margin: 1rem;
}

.auth-header {
  text-align: center;
  margin-bottom: 2rem;
}

.auth-header h1 {
  font-size: 2rem;
  color: var(--primary-color);
  margin-bottom: 0.5rem;
}

.auth-header p {
  color: var(--text-secondary);
}

.auth-tabs {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 2rem;
  background: var(--bg-tertiary);
  padding: 0.25rem;
  border-radius: var(--radius-md);
}

.auth-tab {
  flex: 1;
  padding: 0.75rem 1rem;
  border: none;
  background: transparent;
  color: var(--text-secondary);
  cursor: pointer;
  border-radius: var(--radius-sm);
  transition: all 0.2s;
}

.auth-tab.active {
  background: var(--bg-primary);
  color: var(--primary-color);
  box-shadow: var(--shadow-sm);
}

.auth-tab:hover:not(.active) {
  color: var(--text-primary);
}

/* Forms */
.auth-form {
  margin-bottom: 1rem;
}

.form-group {
  margin-bottom: 1.25rem;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 500;
  color: var(--text-primary);
}

input[type="text"],
input[type="email"],
input[type="password"],
input[type="url"],
select {
  width: 100%;
  padding: 0.625rem 0.875rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  font-size: 14px;
  transition: all 0.2s;
}

input:focus,
select:focus {
  outline: none;
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

small {
  display: block;
  margin-top: 0.25rem;
  color: var(--text-tertiary);
  font-size: 12px;
}

.form-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.forgot-password,
.back-to-login {
  color: var(--primary-color);
  text-decoration: none;
  font-size: 14px;
}

.forgot-password:hover,
.back-to-login:hover {
  text-decoration: underline;
}

/* Buttons */
.btn-primary {
  background: var(--primary-color);
  color: white;
  border: none;
  padding: 0.625rem 1.25rem;
  border-radius: var(--radius-md);
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.btn-primary:hover {
  background: #1d4ed8;
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn-secondary {
  background: var(--secondary-color);
  color: white;
  border: none;
  padding: 0.625rem 1.25rem;
  border-radius: var(--radius-md);
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.btn-secondary:hover {
  background: #475569;
}

.btn-small {
  background: transparent;
  color: var(--primary-color);
  border: 1px solid var(--border-color);
  padding: 0.5rem 0.75rem;
  border-radius: var(--radius-md);
  font-size: 13px;
  cursor: pointer;
  transition: all 0.2s;
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
}

.btn-small:hover {
  background: var(--bg-tertiary);
  border-color: var(--primary-color);
}

.btn-icon {
  background: transparent;
  border: none;
  padding: 0.5rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  color: var(--text-secondary);
  transition: all 0.2s;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

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

.btn-link {
  background: transparent;
  border: none;
  color: var(--primary-color);
  cursor: pointer;
  font-size: 14px;
  text-decoration: none;
}

.btn-link:hover {
  text-decoration: underline;
}

/* Temporary Email Result */
.temp-result {
  margin-top: 1.5rem;
}

.success-box {
  background: #f0fdf4;
  border: 1px solid #bbf7d0;
  border-radius: var(--radius-md);
  padding: 1.25rem;
  color: #166534;
}

.success-box h3 {
  margin-bottom: 0.75rem;
  color: #166534;
}

.success-box p {
  margin-bottom: 0.5rem;
}

/* Main Webmail Interface */
#webmail-screen {
  height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Top Navigation */
.top-nav {
  height: 60px;
  background: var(--bg-primary);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 1rem;
  box-shadow: var(--shadow-sm);
  z-index: 100;
}

.nav-left {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.app-title {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
}

.app-title i {
  color: var(--primary-color);
}

.nav-center {
  flex: 1;
  max-width: 600px;
  margin: 0 2rem;
}

.search-box {
  display: flex;
  align-items: center;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.search-box input {
  border: none;
  background: transparent;
  padding: 0.5rem 1rem;
  outline: none;
  flex: 1;
}

.search-box button {
  background: transparent;
  border: none;
  padding: 0.5rem 0.75rem;
  color: var(--text-secondary);
  cursor: pointer;
}

.nav-right {
  display: flex;
  align-items: center;
}

.user-menu {
  position: relative;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  cursor: pointer;
  padding: 0.5rem;
  border-radius: var(--radius-md);
  transition: background 0.2s;
}

.user-menu:hover {
  background: var(--bg-secondary);
}

.user-avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--bg-tertiary);
}

.user-dropdown {
  position: absolute;
  top: 100%;
  right: 0;
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  min-width: 200px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-10px);
  transition: all 0.2s;
  z-index: 1000;
}

.user-menu:hover .user-dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.user-dropdown a {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  color: var(--text-primary);
  text-decoration: none;
  transition: background 0.2s;
}

.user-dropdown a:hover {
  background: var(--bg-secondary);
}

.user-dropdown .divider {
  height: 1px;
  background: var(--border-color);
  margin: 0.25rem 0;
}

/* Main Container */
.main-container {
  flex: 1;
  display: flex;
  height: calc(100vh - 60px);
}

/* Sidebar */
.sidebar {
  width: 260px;
  background: var(--bg-primary);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  padding: 1rem;
  gap: 1.5rem;
  overflow-y: auto;
}

.compose-btn {
  background: var(--primary-color);
  color: white;
  border: none;
  padding: 0.875rem 1rem;
  border-radius: var(--radius-md);
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  width: 100%;
  box-shadow: var(--shadow-md);
}

.compose-btn:hover {
  background: #1d4ed8;
  transform: translateY(-1px);
  box-shadow: var(--shadow-lg);
}

/* Folder Navigation */
.folder-nav {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.folder-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.625rem 0.875rem;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all 0.2s;
  color: var(--text-primary);
  position: relative;
}

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

.folder-item.active {
  background: var(--primary-color);
  color: white;
}

.folder-item i {
  width: 16px;
  text-align: center;
}

.folder-item span {
  flex: 1;
}

.folder-count {
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  padding: 0.125rem 0.5rem;
  border-radius: 9999px;
  font-size: 12px;
  font-weight: 500;
}

.folder-item.active .folder-count {
  background: rgba(255, 255, 255, 0.2);
  color: white;
}

/* Email Addresses Section */
.email-addresses h3 {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.75rem;
}

.email-addresses {
  border-top: 1px solid var(--border-color);
  padding-top: 1.5rem;
}

#email-list {
  margin-bottom: 0.75rem;
}

.email-address-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.5rem 0.75rem;
  background: var(--bg-secondary);
  border-radius: var(--radius-sm);
  margin-bottom: 0.5rem;
  font-size: 13px;
}

.email-address-item .address {
  font-family: monospace;
  color: var(--text-primary);
}

.email-address-item .type {
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  padding: 0.125rem 0.5rem;
  border-radius: 9999px;
  font-size: 11px;
}

/* Storage Info */
.storage-info {
  margin-top: auto;
  padding-top: 1rem;
  border-top: 1px solid var(--border-color);
}

.storage-bar {
  height: 6px;
  background: var(--bg-tertiary);
  border-radius: 3px;
  margin-bottom: 0.5rem;
  overflow: hidden;
}

.storage-used {
  height: 100%;
  background: var(--primary-color);
  width: 30%; /* Example usage */
  border-radius: 3px;
}

.storage-info small {
  color: var(--text-tertiary);
  font-size: 12px;
}

/* Email List Container */
.email-list-container {
  flex: 1;
  background: var(--bg-primary);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  min-width: 400px;
}

.list-header {
  padding: 1rem;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--bg-primary);
}

.bulk-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.bulk-actions input[type="checkbox"] {
  width: auto;
}

.list-controls {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.list-controls select {
  padding: 0.375rem 0.625rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  font-size: 13px;
}

/* Email List */
.email-list {
  flex: 1;
  overflow-y: auto;
}

.email-item {
  padding: 1rem;
  border-bottom: 1px solid var(--border-color);
  cursor: pointer;
  transition: all 0.2s;
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
}

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

.email-item.selected {
  background: #eff6ff;
  border-color: var(--primary-color);
}

.email-item.unread {
  background: #fafbfc;
  font-weight: 500;
}

.email-checkbox {
  margin-top: 2px;
}

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

.email-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.25rem;
}

.email-sender {
  font-weight: 500;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  flex: 1;
}

.email-date {
  color: var(--text-tertiary);
  font-size: 12px;
  white-space: nowrap;
}

.email-subject {
  color: var(--text-primary);
  margin-bottom: 0.25rem;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

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

/* Pagination */
.pagination {
  padding: 1rem;
  border-top: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  background: var(--bg-primary);
}

.pagination button {
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--border-color);
  background: var(--bg-primary);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.2s;
}

.pagination button:hover:not(:disabled) {
  background: var(--bg-secondary);
}

.pagination button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* Email Viewer */
.email-viewer-container {
  flex: 1;
  background: var(--bg-primary);
  display: flex;
  flex-direction: column;
  min-width: 500px;
}

.email-viewer {
  flex: 1;
  overflow-y: auto;
  padding: 2rem;
}

.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100%;
  color: var(--text-tertiary);
  text-align: center;
}

.empty-state i {
  font-size: 3rem;
  margin-bottom: 1rem;
  opacity: 0.5;
}

.empty-state h3 {
  margin-bottom: 0.5rem;
  font-weight: 500;
}

/* Email Content */
.email-header-full {
  border-bottom: 2px solid var(--border-color);
  padding-bottom: 1.5rem;
  margin-bottom: 2rem;
}

.email-subject-full {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 1rem;
  word-wrap: break-word;
}

.email-meta {
  display: flex;
  align-items: center;
  gap: 2rem;
  flex-wrap: wrap;
  font-size: 14px;
}

.email-meta-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.email-meta-label {
  font-weight: 500;
  color: var(--text-secondary);
}

.email-meta-value {
  color: var(--text-primary);
}

.email-actions {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
}

.email-body {
  line-height: 1.6;
  color: var(--text-primary);
  word-wrap: break-word;
}

.email-body a {
  color: var(--primary-color);
  text-decoration: none;
}

.email-body a:hover {
  text-decoration: underline;
}

/* Attachments */
.email-attachments {
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border-color);
}

.email-attachments h4 {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.75rem;
}

.attachment-list {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.attachment-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem;
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  text-decoration: none;
  color: var(--text-primary);
  transition: all 0.2s;
}

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

.attachment-info {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.attachment-icon {
  width: 32px;
  height: 32px;
  background: var(--bg-tertiary);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
}

.attachment-details {
  display: flex;
  flex-direction: column;
}

.attachment-name {
  font-weight: 500;
  font-size: 14px;
}

.attachment-size {
  font-size: 12px;
  color: var(--text-tertiary);
}

/* Email Composer Modal */
.modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
}

.modal.hidden {
  display: none;
}

.modal-content {
  background: var(--bg-primary);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  width: 90%;
  max-width: 900px;
  max-height: 90vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.modal-content.large {
  max-width: 1200px;
}

.modal-header {
  padding: 1.5rem;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modal-header h3 {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.close-btn {
  background: transparent;
  border: none;
  font-size: 1.25rem;
  color: var(--text-secondary);
  cursor: pointer;
  padding: 0.5rem;
  border-radius: var(--radius-sm);
  transition: all 0.2s;
}

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

/* Composer */
.composer-container {
  display: flex;
  flex-direction: column;
  height: 100%;
}

.composer-header {
  padding: 1rem 1.5rem;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.composer-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.composer-body {
  flex: 1;
  padding: 1.5rem;
  overflow-y: auto;
}

.composer-fields {
  margin-bottom: 1.5rem;
}

.field-row {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1rem;
}

.field-row label {
  min-width: 80px;
  margin-bottom: 0;
}

.recipients-container {
  flex: 1;
  position: relative;
}

.recipients-container input {
  width: 100%;
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
}

.recipients-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
}

.recipient-tag {
  background: var(--bg-tertiary);
  color: var(--text-primary);
  padding: 0.25rem 0.5rem;
  border-radius: 9999px;
  font-size: 13px;
  display: flex;
  align-items: center;
  gap: 0.375rem;
}

.recipient-remove {
  cursor: pointer;
  color: var(--text-secondary);
}

.recipient-remove:hover {
  color: var(--error-color);
}

/* Email Editor */
.composer-editor {
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.editor-toolbar {
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  padding: 0.5rem;
  display: flex;
  gap: 0.25rem;
}

.toolbar-group {
  display: flex;
  gap: 0.25rem;
  margin-right: 0.5rem;
}

.toolbar-btn {
  background: transparent;
  border: none;
  padding: 0.5rem;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.2s;
}

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

.toolbar-btn.active {
  background: var(--primary-color);
  color: white;
}

.email-editor {
  min-height: 300px;
  padding: 1rem;
  border: none;
  outline: none;
  font-family: inherit;
  font-size: 14px;
  line-height: 1.6;
  resize: vertical;
}

.email-editor:empty:before {
  content: attr(placeholder);
  color: var(--text-tertiary);
}

.composer-attachments {
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border-color);
}

/* Contacts */
.contacts-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.5rem;
}

.contacts-list {
  display: grid;
  gap: 1rem;
  max-height: 500px;
  overflow-y: auto;
}

.contact-card {
  padding: 1rem;
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  gap: 1rem;
  transition: all 0.2s;
}

.contact-card:hover {
  background: var(--bg-tertiary);
}

.contact-avatar {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--primary-color);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
}

.contact-info {
  flex: 1;
}

.contact-name {
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: 0.25rem;
}

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

.contact-actions {
  display: flex;
  gap: 0.5rem;
}

/* Settings */
.settings-tabs {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 2rem;
  border-bottom: 1px solid var(--border-color);
}

.settings-tab {
  padding: 0.75rem 1rem;
  background: transparent;
  border: none;
  border-bottom: 2px solid transparent;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.2s;
  font-weight: 500;
}

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

.settings-tab:hover {
  color: var(--text-primary);
}

.settings-panel {
  display: none;
}

.settings-panel:not(.hidden) {
  display: block;
}

.settings-panel h4 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 1rem;
}

/* Loading States */
.loading {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem;
  color: var(--text-secondary);
}

.loading-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(255, 255, 255, 0.9);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  z-index: 9999;
}

.spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--border-color);
  border-top: 3px solid var(--primary-color);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

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

/* Notifications */
.notification-container {
  position: fixed;
  top: 20px;
  right: 20px;
  z-index: 10000;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  max-width: 400px;
}

.notification {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  padding: 1rem;
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  animation: slideIn 0.3s ease-out;
}

.notification.success {
  border-left: 4px solid var(--success-color);
}

.notification.error {
  border-left: 4px solid var(--error-color);
}

.notification.warning {
  border-left: 4px solid var(--warning-color);
}

.notification-icon {
  font-size: 1.25rem;
}

.notification.success .notification-icon {
  color: var(--success-color);
}

.notification.error .notification-icon {
  color: var(--error-color);
}

.notification.warning .notification-icon {
  color: var(--warning-color);
}

.notification-content {
  flex: 1;
}

.notification-title {
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.25rem;
}

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

.notification-close {
  background: transparent;
  border: none;
  color: var(--text-tertiary);
  cursor: pointer;
  padding: 0.25rem;
  border-radius: var(--radius-sm);
  transition: all 0.2s;
}

.notification-close:hover {
  color: var(--text-primary);
  background: var(--bg-secondary);
}

@keyframes slideIn {
  from {
    transform: translateX(100%);
    opacity: 0;
  }
  to {
    transform: translateX(0);
    opacity: 1;
  }
}

/* Responsive Design */
@media (max-width: 1024px) {
  .sidebar {
    width: 220px;
  }

  .email-list-container {
    min-width: 350px;
  }

  .email-viewer-container {
    min-width: 400px;
  }
}

@media (max-width: 768px) {
  .main-container {
    flex-direction: column;
  }

  .sidebar {
    width: 100%;
    height: auto;
    border-right: none;
    border-bottom: 1px solid var(--border-color);
    position: static;
  }

  .email-list-container {
    border-right: none;
    border-bottom: 1px solid var(--border-color);
    min-width: auto;
  }

  .email-viewer-container {
    min-width: auto;
  }

  .nav-center {
    display: none;
  }

  .form-row {
    grid-template-columns: 1fr;
  }

  .auth-container {
    margin: 0.5rem;
    padding: 1.5rem;
  }
}

/* Dark Theme Support */
@media (prefers-color-scheme: dark) {
  :root {
    --bg-primary: #1e293b;
    --bg-secondary: #334155;
    --bg-tertiary: #475569;
    --text-primary: #f8fafc;
    --text-secondary: #cbd5e1;
    --text-tertiary: #94a3b8;
    --border-color: #475569;
  }

  .modal {
    background: rgba(0, 0, 0, 0.7);
  }

  .loading-overlay {
    background: rgba(30, 41, 59, 0.9);
  }
}