/* ==========================================================================
   Design tokens
   ========================================================================== */

:root {
  --accent: #4f6df5;
  --accent-dark: #3b54d6;
  --accent-soft: #eef1ff;
  --accent-soft-strong: #dde4ff;

  --bg: #f4f5f8;
  --card-bg: #ffffff;
  --border: #e3e5ec;
  --border-strong: #cfd3de;

  --text: #1c1f2b;
  --text-muted: #6b7080;
  --text-faint: #9aa0af;

  --success: #1e8e5a;
  --success-soft: #e5f7ee;
  --danger: #d3423f;
  --danger-soft: #fdecec;
  --warning-soft: #fff6e0;

  --unread-bg: #f2f5ff;

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;

  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 24px;
  --space-6: 32px;

  --shadow-sm: 0 1px 2px rgba(20, 24, 40, 0.06);
  --shadow-md: 0 4px 16px rgba(20, 24, 40, 0.08);
  --shadow-lg: 0 12px 32px rgba(20, 24, 40, 0.14);

  --transition-fast: 0.15s ease;
  --transition-base: 0.2s ease;

  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Sans",
    "Yu Gothic", Roboto, sans-serif;

  color-scheme: light;
}

/* ==========================================================================
   Reset / base
   ========================================================================== */

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

html {
  -webkit-text-size-adjust: 100%;
}

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

::selection {
  background: var(--accent-soft-strong);
}

a {
  color: var(--accent);
}

button {
  font-family: inherit;
  cursor: pointer;
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.6;
}

input,
textarea,
select {
  font-family: inherit;
}

/* Accessible keyboard focus ring, without adding an outline on mouse clicks */
:focus {
  outline: none;
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* Slim, unobtrusive scrollbars (WebKit) */
.message-list::-webkit-scrollbar,
.detail-pane::-webkit-scrollbar,
.settings-container::-webkit-scrollbar {
  width: 8px;
}

.message-list::-webkit-scrollbar-thumb,
.detail-pane::-webkit-scrollbar-thumb,
.settings-container::-webkit-scrollbar-thumb {
  background: var(--border-strong);
  border-radius: 4px;
}

.message-list::-webkit-scrollbar-track,
.detail-pane::-webkit-scrollbar-track,
.settings-container::-webkit-scrollbar-track {
  background: transparent;
}

/* ==========================================================================
   Brand mark (auth pages + app header)
   ========================================================================== */

.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, var(--accent), #7c8ff8);
  color: white;
  flex-shrink: 0;
}

.brand-mark svg {
  width: 20px;
  height: 20px;
}

/* ==========================================================================
   Auth pages (login / setup)
   ========================================================================== */

.auth-page {
  min-height: 100vh;
  height: auto;
  overflow-y: auto;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-5) var(--space-4);
  background: radial-gradient(circle at 50% 0%, #eef1ff 0%, var(--bg) 55%);
}

.auth-container {
  width: 100%;
  max-width: 400px;
  padding: var(--space-6) var(--space-5);
  background: var(--card-bg);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
}

.auth-brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-5);
}

.auth-brand-text {
  font-size: 13px;
  color: var(--text-muted);
  font-weight: 500;
}

.auth-container h1 {
  font-size: 21px;
  font-weight: 700;
  margin-bottom: var(--space-5);
  letter-spacing: -0.01em;
}

.form-group {
  margin-bottom: var(--space-4);
}

.form-group label {
  display: block;
  font-size: 13px;
  margin-bottom: var(--space-1);
  font-weight: 600;
  color: var(--text);
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 14px;
  background: var(--card-bg);
  color: var(--text);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-group input:hover,
.form-group textarea:hover,
.form-group select:hover {
  border-color: var(--border-strong);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--text-faint);
}

.btn-primary {
  width: 100%;
  padding: 11px;
  background: var(--accent);
  color: white;
  border: none;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 14px;
  transition: background var(--transition-fast), transform var(--transition-fast),
    box-shadow var(--transition-fast);
}

.btn-primary:hover:not(:disabled) {
  background: var(--accent-dark);
  box-shadow: var(--shadow-sm);
}

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

.auth-error {
  color: var(--danger);
  font-size: 13px;
  margin-top: var(--space-3);
  min-height: 16px;
  line-height: 1.5;
}

.auth-link {
  display: block;
  text-align: center;
  margin-top: var(--space-4);
  font-size: 13px;
  color: var(--accent);
  text-decoration: none;
}

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

.auth-divider {
  text-align: center;
  margin: var(--space-4) 0;
  font-size: 12px;
  color: var(--text-faint);
  position: relative;
}

.auth-divider::before,
.auth-divider::after {
  content: "";
  position: absolute;
  top: 50%;
  width: 35%;
  height: 1px;
  background: var(--border);
}

.auth-divider::before {
  left: 0;
}

.auth-divider::after {
  right: 0;
}

/* ==========================================================================
   Shared buttons
   ========================================================================== */

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 9px 16px;
  background: var(--card-bg);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 14px;
  text-align: center;
  text-decoration: none;
  cursor: pointer;
  transition: background var(--transition-fast), border-color var(--transition-fast);
}

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

.btn-block {
  display: flex;
  width: 100%;
}

.btn-ghost {
  padding: 9px 16px;
  background: transparent;
  color: var(--text-muted);
  border: none;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 14px;
  transition: background var(--transition-fast), color var(--transition-fast);
}

.btn-ghost:hover {
  background: var(--bg);
  color: var(--text);
}

.btn-danger {
  background: var(--danger);
  color: white;
  border: none;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 13px;
  padding: 9px 16px;
  transition: background var(--transition-fast);
}

.btn-danger:hover:not(:disabled) {
  background: #b9312e;
}

.sso-icon {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
}

/* yutimo ID is the primary, recommended login path */

.btn-yutimo {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 11px;
  background: var(--accent);
  color: white;
  border: none;
  border-radius: var(--radius-sm);
  font-weight: 700;
  font-size: 14px;
  text-decoration: none;
  transition: background var(--transition-fast), box-shadow var(--transition-fast);
}

.btn-yutimo:hover {
  background: var(--accent-dark);
  box-shadow: var(--shadow-sm);
}

.auth-recommend {
  text-align: center;
  font-size: 12px;
  color: var(--text-faint);
  margin-top: var(--space-2);
}

.auth-fallback {
  margin-top: var(--space-1);
}

.auth-fallback summary {
  cursor: pointer;
  font-size: 13px;
  color: var(--text-muted);
  text-align: center;
  list-style: none;
  padding: var(--space-2) 0;
}

.auth-fallback summary::-webkit-details-marker {
  display: none;
}

.auth-fallback summary:hover {
  color: var(--text);
}

.auth-fallback[open] summary {
  margin-bottom: var(--space-3);
  font-weight: 600;
  color: var(--text);
}

.auth-fallback form {
  padding-top: var(--space-1);
}

/* ==========================================================================
   App shell
   ========================================================================== */

.app {
  display: flex;
  flex-direction: column;
  height: 100vh;
}

.app-header {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  padding: 10px var(--space-4);
  background: var(--card-bg);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
  position: relative;
  z-index: 30;
}

.app-brand {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-right: var(--space-2);
}

.app-brand .brand-mark {
  width: 30px;
  height: 30px;
  border-radius: 8px;
}

.app-brand .brand-mark svg {
  width: 15px;
  height: 15px;
}

.app-header h1 {
  font-size: 16px;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.01em;
  white-space: nowrap;
}

.folder-tabs {
  display: flex;
  gap: 2px;
  background: var(--bg);
  padding: 3px;
  border-radius: 999px;
  margin-right: auto;
}

.folder-tab {
  padding: 7px 14px;
  border: none;
  background: transparent;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-muted);
  transition: background var(--transition-fast), color var(--transition-fast);
  white-space: nowrap;
}

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

.folder-tab.active {
  background: var(--card-bg);
  color: var(--accent);
  font-weight: 700;
  box-shadow: var(--shadow-sm);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-shrink: 0;
}

.btn-compose {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: 8px 16px;
  background: var(--accent);
  color: white;
  border: none;
  border-radius: 999px;
  font-weight: 600;
  font-size: 13px;
  white-space: nowrap;
  transition: background var(--transition-fast), box-shadow var(--transition-fast);
}

.btn-compose:hover {
  background: var(--accent-dark);
  box-shadow: var(--shadow-sm);
}

.btn-compose svg {
  width: 15px;
  height: 15px;
}

.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border: 1px solid transparent;
  background: transparent;
  border-radius: 999px;
  color: var(--text-muted);
  transition: background var(--transition-fast), color var(--transition-fast);
}

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

.icon-btn svg {
  width: 18px;
  height: 18px;
}

.icon-btn.spinning svg {
  animation: spin 0.9s linear infinite;
}

@keyframes spin {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}

/* Overflow menu */

.menu-wrap {
  position: relative;
}

.menu-panel {
  display: none;
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  padding: var(--space-2);
  min-width: 180px;
  z-index: 40;
}

.menu-panel.open {
  display: block;
}

.menu-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  width: 100%;
  padding: 9px 10px;
  border: none;
  background: transparent;
  border-radius: var(--radius-sm);
  font-size: 13px;
  font-weight: 500;
  color: var(--text);
  text-align: left;
}

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

.menu-item svg {
  width: 16px;
  height: 16px;
  color: var(--text-muted);
  flex-shrink: 0;
}

.menu-item.danger {
  color: var(--danger);
}

.menu-item.danger svg {
  color: var(--danger);
}

.menu-divider {
  height: 1px;
  background: var(--border);
  margin: var(--space-2) 4px;
}

.app-body {
  flex: 1;
  display: grid;
  grid-template-columns: 360px 1fr;
  min-height: 0;
}

.search-bar {
  padding: var(--space-3);
  border-bottom: 1px solid var(--border);
}

.search-bar-inner {
  position: relative;
  display: flex;
  align-items: center;
}

.search-bar-inner svg {
  position: absolute;
  left: 12px;
  width: 15px;
  height: 15px;
  color: var(--text-faint);
  pointer-events: none;
}

.search-bar input {
  width: 100%;
  padding: 9px 12px 9px 34px;
  border: 1px solid var(--border);
  border-radius: 999px;
  font-size: 13px;
  background: var(--bg);
  transition: border-color var(--transition-fast), background var(--transition-fast);
}

.search-bar input:focus {
  background: var(--card-bg);
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

/* ---------- Message list ---------- */

.message-list-pane {
  border-right: 1px solid var(--border);
  overflow-y: auto;
  background: var(--card-bg);
  display: flex;
  flex-direction: column;
  min-height: 0;
}

.message-list {
  overflow-y: auto;
  flex: 1;
}

.message-item {
  display: flex;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid var(--border);
  cursor: pointer;
  position: relative;
  transition: background var(--transition-fast);
}

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

.message-item.unread {
  background: var(--unread-bg);
}

.message-item.unread::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--accent);
}

.message-item.selected {
  background: var(--accent-soft-strong);
}

.message-avatar {
  flex-shrink: 0;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 14px;
  font-weight: 700;
  text-transform: uppercase;
}

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

.message-item-top {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: var(--space-2);
  margin-bottom: 2px;
}

.message-item-from {
  font-size: 14px;
  color: var(--text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.message-item.unread .message-item-from,
.message-item.unread .message-item-subject-line {
  font-weight: 700;
}

.message-item-top-right {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  flex-shrink: 0;
}

.message-item-date {
  font-size: 12px;
  color: var(--text-faint);
  flex-shrink: 0;
}

.message-item-subject-line {
  font-size: 13px;
  color: var(--text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  margin-bottom: 2px;
  display: flex;
  align-items: center;
  gap: 5px;
}

.message-item-subject-line .badge-icon {
  flex-shrink: 0;
  width: 13px;
  height: 13px;
  color: var(--text-faint);
}

.message-item-subject-line .badge-icon.flagged {
  color: #e0a92c;
}

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

.empty-state {
  padding: var(--space-6) var(--space-4);
  text-align: center;
  color: var(--text-faint);
  font-size: 13px;
}

.empty-state-icon {
  width: 40px;
  height: 40px;
  margin: 0 auto var(--space-3);
  color: var(--border-strong);
}

/* ---------- Detail pane ---------- */

.detail-pane {
  overflow-y: auto;
  padding: var(--space-5) var(--space-6);
  background: var(--bg);
}

.detail-back {
  display: none;
}

.detail-header {
  margin-bottom: var(--space-4);
}

.detail-header h2 {
  font-size: 19px;
  font-weight: 700;
  margin-bottom: var(--space-3);
  letter-spacing: -0.01em;
}

.detail-meta-card {
  display: flex;
  gap: var(--space-3);
  align-items: flex-start;
}

.detail-meta-card .message-avatar {
  width: 38px;
  height: 38px;
}

.detail-meta {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.7;
}

.detail-meta strong {
  color: var(--text);
  font-weight: 600;
}

.detail-actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin: var(--space-4) 0;
  flex-wrap: wrap;
}

.zoom-controls {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  margin-left: auto;
}

.zoom-level {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-muted);
  min-width: 38px;
  text-align: center;
}

.quick-read-btn {
  flex-shrink: 0;
  width: 30px;
  height: 30px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: none;
  border-radius: 50%;
  background: var(--bg);
  color: var(--text-muted);
  transition: background var(--transition-fast), color var(--transition-fast);
}

.quick-read-btn:hover {
  background: var(--accent-soft);
  color: var(--accent);
}

.quick-read-btn svg {
  width: 18px;
  height: 18px;
}

.action-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 14px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--card-bg);
  font-size: 13px;
  font-weight: 600;
  color: var(--text-muted);
  transition: background var(--transition-fast), color var(--transition-fast),
    border-color var(--transition-fast);
}

.action-btn svg {
  width: 14px;
  height: 14px;
}

.action-btn:hover {
  background: var(--bg);
  color: var(--text);
}

.action-btn.flagged {
  color: #b3860f;
  border-color: #f0dba8;
  background: var(--warning-soft);
}

.action-btn.danger:hover {
  color: var(--danger);
  border-color: #f3c6c5;
  background: var(--danger-soft);
}

.detail-body-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.detail-body-frame {
  width: 100%;
  min-height: 200px;
  border: none;
  display: block;
}

.attachments-list {
  margin-top: var(--space-4);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.attachment-item {
  padding: var(--space-2) var(--space-3);
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 13px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-2);
}

.attachment-item-name {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  min-width: 0;
}

.attachment-item-name svg {
  flex-shrink: 0;
  width: 14px;
  height: 14px;
  color: var(--text-faint);
}

.attachment-item.unstored {
  color: var(--text-faint);
}

.attachment-item a {
  color: var(--accent);
  text-decoration: none;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.attachment-item a:hover {
  text-decoration: underline;
}

.attachment-item-size {
  flex-shrink: 0;
  color: var(--text-faint);
  font-size: 12px;
}

/* ==========================================================================
   Compose panel
   ========================================================================== */

.compose-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(20, 24, 40, 0.4);
  align-items: center;
  justify-content: center;
  z-index: 50;
  padding: var(--space-4);
}

.compose-overlay.open {
  display: flex;
}

.compose-panel {
  background: var(--card-bg);
  width: min(600px, 100%);
  max-height: 90vh;
  overflow-y: auto;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  display: flex;
  flex-direction: column;
}

.compose-panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4) var(--space-5);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.compose-panel-header h3 {
  font-size: 16px;
  font-weight: 700;
}

.compose-panel-body {
  padding: var(--space-5);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  overflow-y: auto;
}

.compose-panel input:disabled {
  background: var(--bg);
  color: var(--text-muted);
}

.compose-panel textarea {
  min-height: 220px;
  resize: vertical;
  line-height: 1.6;
}

.compose-ai-row {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.compose-hint {
  font-size: 12px;
  color: var(--text-muted);
  background: var(--unread-bg);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  line-height: 1.6;
}

.compose-panel-footer {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-5);
  border-top: 1px solid var(--border);
  flex-shrink: 0;
}

.compose-status {
  font-size: 13px;
  margin-right: auto;
}

.compose-status.error {
  color: var(--danger);
}

.compose-status.success {
  color: var(--success);
}

.btn-send {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: 9px 20px;
  background: var(--accent);
  color: white;
  border: none;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 14px;
  transition: background var(--transition-fast);
}

.btn-send:hover:not(:disabled) {
  background: var(--accent-dark);
}

/* ==========================================================================
   Toast (compose success feedback etc.)
   ========================================================================== */

.toast {
  position: fixed;
  bottom: var(--space-5);
  left: 50%;
  transform: translateX(-50%) translateY(8px);
  background: var(--text);
  color: white;
  padding: 10px 18px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 500;
  box-shadow: var(--shadow-md);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-base), transform var(--transition-base);
  z-index: 100;
}

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

/* ==========================================================================
   Settings page
   ========================================================================== */

.settings-container {
  max-width: 760px;
  margin: 0 auto;
  padding: var(--space-6) var(--space-4) var(--space-6);
  height: 100vh;
  overflow-y: auto;
}

.settings-header {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-5);
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  color: var(--text-muted);
  text-decoration: none;
  font-size: 13px;
  font-weight: 500;
}

.back-link:hover {
  color: var(--accent);
}

.back-link svg {
  width: 15px;
  height: 15px;
}

.settings-title {
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.settings-section {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  margin-bottom: var(--space-4);
  box-shadow: var(--shadow-sm);
}

.settings-section-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-3);
  margin-bottom: var(--space-2);
}

.settings-section h2 {
  font-size: 16px;
  font-weight: 700;
}

.settings-hint {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: var(--space-4);
}

.settings-hint strong {
  color: var(--text);
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4);
}

@media (max-width: 640px) {
  .form-row {
    grid-template-columns: 1fr;
  }
}

.email-account-item {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: var(--space-4);
  margin-bottom: var(--space-3);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-3);
  flex-wrap: wrap;
}

.email-account-info {
  flex: 1;
  min-width: 180px;
}

.email-account-info .display-name {
  font-weight: 700;
  color: var(--text);
  font-size: 14px;
}

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

.email-account-info .default-badge {
  display: inline-block;
  background: var(--success-soft);
  color: var(--success);
  font-size: 11px;
  font-weight: 700;
  padding: 3px 8px;
  border-radius: 999px;
  margin-top: var(--space-2);
}

.email-account-actions {
  display: flex;
  gap: var(--space-2);
  flex-wrap: wrap;
}

.btn-small {
  padding: 6px 12px;
  font-size: 12px;
  font-weight: 600;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--card-bg);
  color: var(--text);
  transition: background var(--transition-fast), border-color var(--transition-fast);
}

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

.btn-small.danger {
  color: var(--danger);
  border-color: var(--danger-soft);
}

.btn-small.danger:hover {
  background: var(--danger-soft);
  border-color: var(--danger);
}

.btn-large {
  width: 100%;
  padding: 10px 20px;
  font-size: 14px;
  font-weight: 600;
  background: var(--accent);
  color: white;
  border: none;
  border-radius: var(--radius-sm);
  transition: background var(--transition-fast);
}

.btn-large:hover:not(:disabled) {
  background: var(--accent-dark);
}

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

.btn-large.btn-muted:hover {
  background: var(--border);
}

/* Modal */

.modal {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(20, 24, 40, 0.45);
  z-index: 1000;
  justify-content: center;
  align-items: center;
  padding: var(--space-4);
}

.modal.active {
  display: flex;
}

.modal-content {
  background: var(--card-bg);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  max-width: 520px;
  width: 100%;
  max-height: 85vh;
  overflow-y: auto;
  box-shadow: var(--shadow-lg);
}

.modal-content h3 {
  font-size: 17px;
  font-weight: 700;
  margin-bottom: var(--space-4);
}

.modal-actions {
  display: flex;
  justify-content: flex-end;
  gap: var(--space-3);
  margin-top: var(--space-5);
}

.modal-actions .btn-large {
  width: auto;
  padding: 9px 20px;
}

.message {
  padding: var(--space-3);
  border-radius: var(--radius-sm);
  margin-bottom: var(--space-4);
  font-size: 13px;
  display: none;
}

.message.success {
  background: var(--success-soft);
  color: var(--success);
  display: block;
}

.message.error {
  background: var(--danger-soft);
  color: var(--danger);
  display: block;
}

.settings-hint-inline {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: var(--space-1);
  line-height: 1.5;
}

/* ==========================================================================
   Mobile layout
   ========================================================================== */

@media (max-width: 768px) {
  .app-body {
    grid-template-columns: 1fr;
  }

  .message-list-pane {
    border-right: none;
  }

  .app-body.showing-detail .message-list-pane {
    display: none;
  }

  .app-body:not(.showing-detail) .detail-pane {
    display: none;
  }

  .detail-back {
    display: inline-flex;
    align-items: center;
    gap: var(--space-1);
    margin-bottom: var(--space-3);
    background: none;
    border: none;
    color: var(--accent);
    font-size: 13px;
    font-weight: 600;
  }

  .detail-back svg {
    width: 14px;
    height: 14px;
  }

  .app-header h1 {
    display: none;
  }

  .folder-tabs {
    margin-right: 0;
    flex: 1;
    justify-content: space-between;
  }

  .folder-tab {
    flex: 1;
    text-align: center;
    padding: 7px 6px;
  }

  .detail-pane {
    padding: var(--space-4);
  }

  .compose-panel {
    width: 100%;
    height: 100%;
    max-height: 100%;
    border-radius: 0;
  }

  .auth-page {
    padding: var(--space-4);
  }

  .auth-container {
    padding: var(--space-5) var(--space-4);
  }
}