:root {
  --bg-page: #f8fafc;
  --bg-surface: #ffffff;
  --bg-subtle: #f1f5f9;
  --bg-accent-soft: #eff6ff;
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #64748b;
  --border-color: #e2e8f0;
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --success: #059669;
  --success-bg: #ecfdf5;
  --warning: #d97706;
  --warning-bg: #fffbeb;
  --danger: #dc2626;
  --danger-bg: #fef2f2;
  --radius-lg: 14px;
  --radius-md: 10px;
  --radius-sm: 6px;
  --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.06);
  --shadow-md: 0 4px 12px rgba(15, 23, 42, 0.07);
}

* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
  background-color: var(--bg-page);
  color: var(--text-primary);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Inter", "Noto Sans Arabic", "Cairo", sans-serif;
  font-size: 15px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

/* Header & Top Bar */
.app-header {
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 30;
}

.header-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 14px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.brand-group {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-logo {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background: linear-gradient(135deg, #2563eb, #1d4ed8);
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 18px;
  flex-shrink: 0;
  box-shadow: 0 2px 6px rgba(37, 99, 235, 0.25);
}

.brand-title {
  margin: 0;
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
}

.brand-subtitle {
  margin: 0;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.header-controls {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.mode-pill {
  font-size: 0.75rem;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: 999px;
  background: var(--success-bg);
  color: var(--success);
  border: 1px solid rgba(5, 150, 105, 0.2);
}

.lang-selector-wrap {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.select-input {
  padding: 6px 10px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
  background-color: var(--bg-surface);
  color: var(--text-primary);
  font-size: 0.85rem;
  font-family: inherit;
  cursor: pointer;
}

.select-input:focus {
  outline: 2px solid var(--primary);
  outline-offset: 1px;
}

/* Main Container */
.main-container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

/* Hero Active Email & Timer Card */
.active-email-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 20px 24px;
  box-shadow: var(--shadow-sm);
  display: grid;
  grid-template-columns: 1.35fr 1fr;
  gap: 24px;
  align-items: center;
}

.active-address-section {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.section-label-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  flex-wrap: wrap;
}

.section-heading {
  margin: 0;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.status-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 10px;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 600;
}

.status-badge.active {
  background: var(--success-bg);
  color: var(--success);
}

.status-badge.expired {
  background: var(--danger-bg);
  color: var(--danger);
}

.address-box {
  display: flex;
  align-items: stretch;
  gap: 10px;
  flex-wrap: wrap;
}

.email-display-input {
  flex: 1;
  min-width: 220px;
  padding: 12px 16px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 1.08rem;
  font-weight: 600;
  color: var(--text-primary);
  background: var(--bg-subtle);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  direction: ltr;
  text-align: left;
  user-select: all;
}

.action-row {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 16px;
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  border: 1px solid transparent;
  transition: background-color 0.15s ease, border-color 0.15s ease, transform 0.05s ease;
  white-space: nowrap;
}

.btn:active:not(:disabled) {
  transform: translateY(1px);
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

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

.btn-primary:hover:not(:disabled) {
  background: var(--primary-hover);
}

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

.btn-secondary:hover:not(:disabled) {
  background: var(--bg-subtle);
}

.btn-success {
  background: var(--success);
  color: #ffffff;
}

.btn-sm {
  padding: 6px 12px;
  font-size: 0.82rem;
  border-radius: var(--radius-sm);
}

/* 7-Day Expiration Countdown Panel */
.timer-panel {
  background: var(--bg-subtle);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.timer-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
  direction: ltr;
}

.timer-unit {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 8px 6px;
  text-align: center;
}

.timer-value {
  display: block;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--primary);
}

.timer-panel.expired .timer-value {
  color: var(--danger);
}

.timer-label {
  display: block;
  font-size: 0.72rem;
  color: var(--text-muted);
  margin-top: 2px;
}

.timer-meta {
  display: flex;
  justify-content: space-between;
  gap: 8px;
  font-size: 0.76rem;
  color: var(--text-muted);
  flex-wrap: wrap;
}

.timer-note {
  margin: 0;
  font-size: 0.75rem;
  color: var(--text-secondary);
  line-height: 1.4;
}

/* Rate Limit Alert Banner */
.alert-banner {
  padding: 12px 16px;
  border-radius: var(--radius-md);
  background: var(--warning-bg);
  border: 1px solid rgba(217, 119, 6, 0.35);
  color: var(--warning);
  font-size: 0.88rem;
  font-weight: 500;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.hidden {
  display: none !important;
}

/* Workspace Grid: History Sidebar + Inbox & Viewer */
.workspace-grid {
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 20px;
  align-items: start;
}

.panel-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}

.panel-header {
  padding: 14px 18px;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  flex-wrap: wrap;
}

.panel-title {
  margin: 0;
  font-size: 1rem;
  font-weight: 700;
}

.panel-subtitle {
  margin: 2px 0 0 0;
  font-size: 0.76rem;
  color: var(--text-muted);
}

/* History List */
.history-list {
  max-height: 540px;
  overflow-y: auto;
  divide-y: 1px solid var(--border-color);
  margin: 0;
  padding: 0;
  list-style: none;
}

.history-item {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border-color);
  cursor: pointer;
  transition: background-color 0.12s ease;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

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

.history-item:hover {
  background-color: var(--bg-subtle);
}

.history-item.selected {
  background-color: var(--bg-accent-soft);
  border-inline-start: 4px solid var(--primary);
}

.history-item-address {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 0.86rem;
  font-weight: 600;
  color: var(--text-primary);
  direction: ltr;
  text-align: left;
  word-break: break-all;
}

.history-item-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 6px;
  flex-wrap: wrap;
  font-size: 0.74rem;
  color: var(--text-muted);
}

.badge-sm {
  padding: 2px 7px;
  border-radius: 999px;
  font-size: 0.7rem;
  font-weight: 600;
}

.badge-sm.current {
  background: var(--primary);
  color: #ffffff;
}

.badge-sm.expired {
  background: var(--danger-bg);
  color: var(--danger);
}

.badge-sm.active {
  background: var(--success-bg);
  color: var(--success);
}

/* Inbox & Message Split Area */
.inbox-split-layout {
  display: grid;
  grid-template-columns: 360px 1fr;
  min-height: 520px;
}

.inbox-list-column {
  border-inline-end: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
}

.inbox-toolbar {
  padding: 10px 14px;
  background: var(--bg-subtle);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  flex-wrap: wrap;
  font-size: 0.78rem;
  color: var(--text-secondary);
}

.messages-list {
  margin: 0;
  padding: 0;
  list-style: none;
  overflow-y: auto;
  max-height: 480px;
  flex: 1;
}

.message-row {
  padding: 13px 16px;
  border-bottom: 1px solid var(--border-color);
  cursor: pointer;
  transition: background-color 0.12s ease;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.message-row:hover {
  background: var(--bg-subtle);
}

.message-row.active {
  background: var(--bg-accent-soft);
  border-inline-start: 4px solid var(--primary);
}

.message-row.unread .message-subject {
  font-weight: 700;
}

.message-top-line {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.message-sender {
  font-size: 0.84rem;
  font-weight: 600;
  color: var(--text-primary);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.message-time {
  font-size: 0.73rem;
  color: var(--text-muted);
  flex-shrink: 0;
}

.message-subject {
  font-size: 0.88rem;
  color: var(--text-primary);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.message-preview {
  font-size: 0.78rem;
  color: var(--text-muted);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.otp-inline-pill {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  align-self: flex-start;
  margin-top: 2px;
  padding: 2px 8px;
  border-radius: 999px;
  background: #fef3c7;
  color: #b45309;
  font-size: 0.72rem;
  font-weight: 700;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
}

/* Message Viewer Column */
.message-viewer-column {
  display: flex;
  flex-direction: column;
  min-height: 480px;
}

.viewer-header {
  padding: 16px 20px;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.viewer-subject {
  margin: 0;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
}

.viewer-meta-grid {
  display: flex;
  flex-direction: column;
  gap: 4px;
  font-size: 0.82rem;
  color: var(--text-secondary);
}

.viewer-actions-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  flex-wrap: wrap;
  padding-top: 6px;
}

.otp-banner {
  margin: 12px 20px 0 20px;
  padding: 10px 14px;
  background: #ecfdf5;
  border: 1px solid #6ee7b7;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  flex-wrap: wrap;
}

.otp-banner-label {
  font-size: 0.85rem;
  font-weight: 600;
  color: #065f46;
}

.otp-buttons-wrap {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.viewer-body-container {
  flex: 1;
  padding: 16px 20px;
  display: flex;
  flex-direction: column;
}

.sanitized-iframe {
  width: 100%;
  min-height: 360px;
  flex: 1;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  background: #ffffff;
}

.plain-text-view {
  margin: 0;
  padding: 16px;
  background: var(--bg-subtle);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 0.86rem;
  line-height: 1.6;
  white-space: pre-wrap;
  word-break: break-word;
  min-height: 340px;
  max-height: 460px;
  overflow-y: auto;
}

/* Empty & Loading States */
.state-box {
  padding: 40px 20px;
  text-align: center;
  color: var(--text-muted);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
  flex: 1;
}

.state-title {
  margin: 0;
  font-size: 0.96rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.state-desc {
  margin: 0;
  font-size: 0.82rem;
  max-width: 340px;
}

/* Footer & Info Bar */
.app-footer {
  max-width: 1280px;
  margin: 0 auto 28px auto;
  padding: 0 20px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.info-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 14px 18px;
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.footer-attribution {
  text-align: center;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.footer-attribution a {
  color: var(--primary);
  text-decoration: none;
  font-weight: 600;
}

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

/* Toast Notification */
.toast-container {
  position: fixed;
  bottom: 20px;
  inset-inline-end: 20px;
  z-index: 100;
  display: flex;
  flex-direction: column;
  gap: 8px;
  max-width: 340px;
}

.toast-item {
  background: #0f172a;
  color: #ffffff;
  padding: 12px 16px;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  font-size: 0.86rem;
  font-weight: 500;
  animation: fadeIn 0.2s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Responsive Breakpoints */
@media (max-width: 1024px) {
  .active-email-card {
    grid-template-columns: 1fr;
  }
  .workspace-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .inbox-split-layout {
    grid-template-columns: 1fr;
  }
  .inbox-list-column {
    border-inline-end: none;
    border-bottom: 1px solid var(--border-color);
  }
}