/* Mail-client–inspired layout */
.mail-app {
  display: grid;
  grid-template-columns: 180px 1fr;
  min-height: 560px;
  background: #fff;
  border: 1px solid #a8b0c0;
  border-radius: 4px;
  overflow: hidden;
  box-shadow: var(--slide-shadow);
}

.mail-main {
  display: flex;
  flex-direction: column;
  min-width: 0;
  min-height: 0;
}

.mail-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  flex-wrap: wrap;
  padding: 0.5rem 0.75rem;
  background: #f4f6fa;
  border-bottom: 1px solid #d0d8e0;
  font-size: 0.8rem;
}

.mail-new-btn {
  background: var(--ribbon-mid);
  color: #fff;
  border: none;
  padding: 0.4rem 0.75rem;
  border-radius: 4px;
  font-weight: 600;
  cursor: pointer;
  font-family: inherit;
  font-size: 0.85rem;
}

.mail-new-btn:hover {
  filter: brightness(1.08);
}

.mail-toolbar-hint {
  color: var(--muted);
  font-size: 0.78rem;
}

@media (max-width: 700px) {
  .mail-app {
    grid-template-columns: 1fr;
  }

  .mail-folders {
    display: flex;
    flex-wrap: wrap;
    gap: 0.25rem;
    border-right: none;
    border-bottom: 1px solid #a8b0c0;
    padding: 0.5rem;
  }

  .mail-folder {
    border-radius: 4px;
    border: 1px solid transparent;
  }

  .mail-folder.active {
    border-color: var(--ribbon-mid);
  }
}

.mail-folders {
  background: linear-gradient(180deg, #eef2f8 0%, #e4e9f0 100%);
  border-right: 1px solid #a8b0c0;
  padding: 0.75rem 0;
  font-size: 0.85rem;
}

.mail-folder {
  display: block;
  width: 100%;
  text-align: left;
  padding: 0.45rem 0.85rem;
  cursor: pointer;
  color: var(--muted);
  border: none;
  background: transparent;
  font-family: inherit;
  font-size: inherit;
}

.mail-folder:hover {
  background: rgba(255, 255, 255, 0.35);
}

.mail-folder.active {
  background: #d4dce8;
  font-weight: 600;
  color: var(--ink);
  border-left: 3px solid var(--accent);
}

.mail-columns {
  display: grid;
  grid-template-columns: minmax(200px, 320px) 1fr;
  flex: 1;
  min-height: 480px;
}

@media (max-width: 900px) {
  .mail-columns {
    grid-template-columns: 1fr;
  }
}

.mail-list {
  border-right: 1px solid #d0d8e0;
  overflow-y: auto;
  max-height: 560px;
  background: #fafbfc;
}

.mail-item {
  padding: 0.65rem 0.85rem;
  border-bottom: 1px solid #e4e8ee;
  cursor: pointer;
  font-size: 0.85rem;
  transition: background 0.12s;
}

.mail-item:hover {
  background: #eef4fc;
}

.mail-item.is-selected {
  background: #d6e8ff;
  border-left: 3px solid var(--ribbon-mid);
  padding-left: calc(0.85rem - 3px);
}

.mail-item-from {
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 0.15rem;
}

.mail-item-subject {
  color: var(--muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.mail-reading {
  padding: 1rem 1.25rem;
  overflow-y: auto;
  max-height: 560px;
  background: #fff;
}

.mail-reading header {
  border-bottom: 1px solid #e4e8ee;
  padding-bottom: 0.75rem;
  margin-bottom: 1rem;
}

.mail-reading .subject {
  font-size: 1.1rem;
  font-weight: 600;
  margin: 0 0 0.35rem;
}

.mail-reading .meta {
  font-size: 0.8rem;
  color: var(--muted);
}

.mail-reading .body {
  font-size: 0.95rem;
  line-height: 1.6;
  white-space: pre-wrap;
  font-family: var(--font-ui);
}

.mail-reading .body strong {
  color: var(--ribbon-mid);
}

.mail-read-actions {
  margin-top: 1.25rem;
  padding-top: 0.75rem;
  border-top: 1px solid #e4e8ee;
}

.mail-mini-btn {
  padding: 0.35rem 0.65rem;
  border: 1px solid #c8d0e0;
  border-radius: 4px;
  background: #fff;
  cursor: pointer;
  font-family: inherit;
  font-size: 0.85rem;
}

.mail-mini-btn:hover {
  border-color: var(--ribbon-mid);
}

.mail-mini-btn--primary {
  background: var(--ribbon-mid);
  color: #fff;
  border-color: var(--ribbon-mid);
}

.mail-compose-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
}

.mail-compose-label {
  width: 4.5rem;
  flex-shrink: 0;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--ribbon-mid);
}

.mail-compose-input {
  flex: 1;
  min-width: 0;
  padding: 0.35rem 0.5rem;
  border: 1px solid #c8d0e0;
  border-radius: 4px;
  font-family: inherit;
  font-size: 0.9rem;
}

.mail-compose-body {
  width: 100%;
  margin-top: 0.35rem;
  padding: 0.5rem 0.65rem;
  border: 1px solid #c8d0e0;
  border-radius: 4px;
  font-family: inherit;
  font-size: 0.9rem;
  line-height: 1.5;
  resize: vertical;
  min-height: 200px;
}

.mail-compose-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.75rem;
}

.mail-compose-note {
  margin: 0.75rem 0 0;
  font-size: 0.78rem;
  color: var(--muted);
}

.mail-empty {
  color: var(--muted);
  font-size: 0.95rem;
  padding: 2rem;
  text-align: center;
}

.page-intro h1 {
  margin: 0 0 0.35rem;
  color: var(--ribbon-mid);
}

.page-intro p {
  margin: 0 0 1rem;
  color: var(--muted);
}