/* BKMS Mail — professional two-pane mail client */
.app-tabs {
  display: flex;
  gap: 0.35rem;
  justify-self: center;
  flex-shrink: 0;
  margin: 0;
}
.app-tab {
  padding: 0.42rem 0.9rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--pill-bg-muted);
  color: var(--muted);
  font-size: 0.8125rem;
  font-weight: 600;
  cursor: pointer;
  transition: border-color 0.15s, color 0.15s, background 0.15s;
}
.app-tab:hover {
  color: var(--text);
  border-color: rgba(71, 161, 255, 0.45);
}
.app-tab.active {
  color: #fff;
  border-color: var(--accent);
  background: linear-gradient(180deg, var(--accent-top) 0%, var(--accent) 100%);
  box-shadow: 0 2px 8px var(--btn-shadow);
}
.app-panel { display: flex; flex-direction: column; flex: 1; min-height: 0; overflow: hidden; }
.app-panel[hidden] { display: none !important; }
#panel-mail {
  flex: 1 1 auto;
  min-height: 0;
}

.mail-workspace {
  display: grid;
  grid-template-columns: minmax(300px, 380px) minmax(0, 1fr);
  flex: 1;
  min-height: 0;
  height: 100%;
  overflow: hidden;
  background: var(--bg);
}

/* —— List pane —— */
.mail-list-pane {
  display: flex;
  flex-direction: column;
  border-right: 1px solid var(--border);
  background: var(--surface-muted);
  min-height: 0;
}

.mail-toolbar {
  flex-shrink: 0;
  padding: 0.75rem 0.85rem 0.55rem;
  border-bottom: 1px solid var(--border);
  background: var(--surface-elevated);
}

.mail-search-box {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0 0.75rem;
  height: 2.25rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--input-bg);
  transition: border-color 0.15s, box-shadow 0.15s;
}
.mail-search-box:focus-within {
  border-color: rgba(71, 161, 255, 0.55);
  box-shadow: 0 0 0 3px var(--focus-ring);
}
.mail-search-icon {
  flex-shrink: 0;
  width: 1rem;
  height: 1rem;
  color: var(--muted);
  opacity: 0.85;
}
.mail-search-box input {
  flex: 1;
  min-width: 0;
  border: 0;
  background: transparent;
  color: var(--text);
  font: inherit;
  font-size: 0.8125rem;
  font-weight: 500;
  outline: none;
}
.mail-search-box input::placeholder { color: var(--text-dim); }

.mail-list-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  margin-top: 0.45rem;
  padding: 0 0.15rem;
  min-height: 1.1rem;
}
.mail-status {
  font-size: 0.6875rem;
  color: var(--mail-date);
  font-weight: 500;
  letter-spacing: 0.01em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.mail-status strong { color: var(--text-secondary); font-weight: 600; }
.mail-folder-tag {
  flex-shrink: 0;
  font-size: 0.625rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--mail-meta);
  padding: 0.1rem 0.45rem;
  border-radius: 4px;
  border: 1px solid rgba(138, 160, 180, 0.25);
  background: rgba(138, 160, 180, 0.08);
}

.mail-list {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  scrollbar-width: thin;
  scrollbar-color: var(--scrollbar) transparent;
}
.mail-list::-webkit-scrollbar { width: 6px; }
.mail-list::-webkit-scrollbar-thumb {
  background: var(--scrollbar);
  border-radius: 99px;
}

.mail-list-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.65rem;
  padding: 2.5rem 1.5rem;
  text-align: center;
  color: var(--muted);
  font-size: 0.8125rem;
  font-weight: 500;
  line-height: 1.5;
}
.mail-list-empty svg {
  width: 2.5rem;
  height: 2.5rem;
  opacity: 0.45;
}

/* Gmail-style row */
.mail-row {
  display: flex;
  align-items: flex-start;
  gap: 0.7rem;
  padding: 0.72rem 0.85rem;
  border-bottom: 1px solid var(--mail-row-border);
  cursor: pointer;
  transition: background 0.1s;
  outline: none;
}
.mail-row:hover { background: var(--mail-row-hover); }
.mail-row:focus-visible {
  background: var(--row-hover-accent);
  box-shadow: inset 0 0 0 2px rgba(71, 161, 255, 0.35);
}
.mail-row.active {
  background: var(--mail-row-active);
  box-shadow: inset 3px 0 0 var(--accent-bright);
}

.mail-row-avatar {
  flex-shrink: 0;
  width: 2.25rem;
  height: 2.25rem;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--mail-avatar-text);
  background: linear-gradient(145deg, #2a4a6a 0%, #1a3048 100%);
  border: 1px solid rgba(71, 161, 255, 0.2);
  margin-top: 0.05rem;
}
.mail-row:nth-child(5n+2) .mail-row-avatar { background: linear-gradient(145deg, #3d4a2a 0%, #2a3418 100%); border-color: rgba(120, 180, 80, 0.2); }
.mail-row:nth-child(5n+3) .mail-row-avatar { background: linear-gradient(145deg, #4a2a3d 0%, #341828 100%); border-color: rgba(200, 120, 160, 0.2); }
.mail-row:nth-child(5n+4) .mail-row-avatar { background: linear-gradient(145deg, #2a4a4a 0%, #183434 100%); border-color: rgba(80, 180, 180, 0.2); }

.mail-row-body {
  flex: 1;
  min-width: 0;
}

.mail-row-top {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
  margin-bottom: 0.15rem;
}
.mail-row-from {
  flex: 1;
  min-width: 0;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.mail-row.active .mail-row-from { color: var(--text); }
.mail-row-date {
  flex-shrink: 0;
  font-size: 0.6875rem;
  color: var(--mail-date);
  font-variant-numeric: tabular-nums;
  font-weight: 500;
  white-space: nowrap;
  text-align: right;
  line-height: 1.25;
}
.mail-row.active .mail-row-date { color: var(--accent-bright); }

.mail-row-flag {
  flex-shrink: 0;
  fill: var(--danger, #cf222e);
}

.mail-row-mid {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  min-width: 0;
  margin-bottom: 0.12rem;
}
.mail-row-subject {
  flex: 1;
  min-width: 0;
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--mail-subject);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.mail-row.active .mail-row-subject { font-weight: 600; color: var(--mail-subject-active); }

.mail-row-snippet {
  font-size: 0.75rem;
  color: var(--mail-snippet);
  line-height: 1.35;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.mail-search-hit,
mark.mail-search-hit {
  background: var(--mail-search-hit-bg);
  color: var(--mail-search-hit-text);
  padding: 0 0.12em;
  border-radius: 2px;
  font-weight: 600;
  box-decoration-break: clone;
  -webkit-box-decoration-break: clone;
}
.mail-row-subject .mail-search-hit,
.mail-row-snippet .mail-search-hit,
.mail-read-subject .mail-search-hit,
.mail-att-chip .mail-search-hit {
  background: var(--mail-search-hit-bg);
  color: var(--mail-search-hit-text);
}

.mail-row-badge {
  display: inline-flex;
  align-items: center;
  font-size: 0.5625rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.1rem 0.35rem;
  border-radius: 3px;
  border: 1px solid transparent;
  flex-shrink: 0;
}
.mail-row-badges {
  display: inline-flex;
  align-items: center;
  gap: 0.2rem;
  flex-shrink: 0;
}
.mail-row-badge--pdf {
  background: rgba(210, 153, 34, 0.18);
  color: #e3b341;
  border-color: rgba(227, 179, 65, 0.35);
}
.mail-row-badge--excel {
  background: rgba(33, 115, 70, 0.2);
  color: #21a366;
  border-color: rgba(33, 163, 102, 0.38);
}
.mail-row-badge--word {
  background: rgba(43, 87, 154, 0.22);
  color: #5b9bd5;
  border-color: rgba(43, 87, 154, 0.4);
}
.mail-row-badge--ppt {
  background: rgba(210, 71, 38, 0.2);
  color: #f36f4a;
  border-color: rgba(210, 71, 38, 0.38);
}

/* —— Read pane —— */
.mail-read-pane {
  display: flex;
  flex-direction: column;
  min-height: 0;
  height: 100%;
  overflow: hidden;
  background: var(--bg);
}

.mail-read-empty {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  color: var(--text-dim);
  font-size: 0.875rem;
  font-weight: 500;
  padding: 2rem;
  text-align: center;
  line-height: 1.55;
}
.mail-read-empty svg {
  width: 3.5rem;
  height: 3.5rem;
  opacity: 0.35;
}
.mail-read-empty strong {
  display: block;
  color: var(--text-secondary);
  font-size: 0.9375rem;
  font-weight: 600;
  margin-bottom: 0.15rem;
}

.mail-read-inner {
  display: flex;
  flex-direction: column;
  flex: 1;
  min-height: 0;
  overflow: hidden;
}

.mail-read-header {
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: 0;
  height: auto;
  min-height: 0;
  max-height: none;
  padding: 1.15rem 1.5rem 1rem;
  border-bottom: 1px solid var(--border);
  background: var(--surface-elevated);
  z-index: 1;
}

.mail-read-subject {
  margin: 0 0 1rem;
  padding: 0;
  font-size: 1.125rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--mail-read-title);
  line-height: 1.35;
  word-break: break-word;
}

.mail-read-sender {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
}

.mail-sender-avatar {
  flex-shrink: 0;
  width: 2.5rem;
  height: 2.5rem;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--mail-avatar-text);
  background: linear-gradient(145deg, #2a4a6a 0%, #1a3048 100%);
  border: 1px solid rgba(71, 161, 255, 0.25);
}

.mail-sender-info { flex: 1; min-width: 0; }
.mail-sender-row {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
}
.mail-sender-main { flex: 1; min-width: 0; }
.mail-sender-date {
  flex-shrink: 0;
  font-size: 0.75rem;
  color: var(--mail-date);
  font-weight: 500;
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
  padding-top: 0.1rem;
}
.mail-sender-name {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 0.15rem;
}
.mail-sender-email {
  font-size: 0.75rem;
  color: var(--mail-sender-email);
  font-weight: 500;
}
.mail-sender-meta {
  margin-top: 0.3rem;
  font-size: 0.75rem;
  color: var(--text-dim);
  font-weight: 500;
  line-height: 1.45;
}
.mail-sender-meta-label {
  color: var(--mail-date);
  font-weight: 600;
  margin-right: 0.25rem;
}
.mail-sender-meta-value {
  color: var(--text-secondary);
  word-break: break-word;
}

.mail-attachments {
  flex-shrink: 0;
  width: 100%;
  margin-top: 1rem;
  padding-top: 0.85rem;
  border-top: 1px solid rgba(42, 53, 66, 0.65);
}
.mail-attachments-title {
  font-size: 0.6875rem;
  font-weight: 600;
  color: var(--mail-date);
  margin-bottom: 0.5rem;
}
.mail-att-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}
.mail-att-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.4rem 0.7rem 0.4rem 0.45rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--mail-att-bg);
  color: var(--text);
  font-size: 0.75rem;
  font-weight: 500;
  cursor: pointer;
  transition: border-color 0.12s, background 0.12s, transform 0.1s;
  max-width: 100%;
}
.mail-att-chip:hover {
  border-color: rgba(71, 161, 255, 0.5);
  background: var(--row-hover-accent);
  transform: translateY(-1px);
}
.mail-att-chip .att-icon {
  width: 1.75rem;
  height: 1.75rem;
  border-radius: 6px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 0.5625rem;
  font-weight: 800;
  flex-shrink: 0;
}
.mail-att-chip--pdf .att-icon {
  background: rgba(210, 153, 34, 0.22);
  color: #e3b341;
  border: 1px solid rgba(227, 179, 65, 0.35);
}
.mail-att-chip--excel .att-icon {
  background: rgba(33, 115, 70, 0.22);
  color: #21a366;
  border: 1px solid rgba(33, 163, 102, 0.4);
}
.mail-att-chip--word .att-icon {
  background: rgba(43, 87, 154, 0.24);
  color: #5b9bd5;
  border: 1px solid rgba(43, 87, 154, 0.45);
}
.mail-att-chip--ppt .att-icon {
  background: rgba(210, 71, 38, 0.22);
  color: #f36f4a;
  border: 1px solid rgba(210, 71, 38, 0.42);
}
.mail-att-chip--image .att-icon {
  background: rgba(255, 255, 255, 0.94);
  color: #4a5564;
  border: 1px solid rgba(210, 218, 226, 0.55);
}
.mail-att-chip--file .att-icon {
  background: rgba(138, 152, 166, 0.18);
  color: #a8b6c4;
  border: 1px solid rgba(138, 152, 166, 0.28);
}
.mail-att-chip .att-name {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 240px;
}
.mail-att-chip .att-size {
  color: var(--text-dim);
  font-weight: 500;
  font-size: 0.6875rem;
}

.mail-body-wrap {
  flex: 1 1 auto;
  min-height: 0;
  overflow-y: auto;
  overflow-x: hidden;
  padding: 1.25rem 1.5rem 1.5rem;
  background: var(--bg);
  scrollbar-width: thin;
  scrollbar-color: var(--scrollbar) transparent;
}
.mail-body-frame {
  display: block;
  width: 100%;
  min-height: 200px;
  height: auto;
  border: 0;
  border-radius: 8px;
  background: var(--mail-body-bg);
  box-shadow: 0 1px 4px var(--shadow-soft);
}

/* —— Preview modal —— */
.mail-preview-backdrop {
  position: fixed;
  inset: 0;
  z-index: 1000;
  background: rgba(0, 0, 0, 0.78);
  backdrop-filter: blur(6px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.25rem;
}
.mail-preview-backdrop[hidden] { display: none !important; }
.mail-preview-modal {
  width: min(1100px, 96vw);
  height: min(88vh, 900px);
  display: flex;
  flex-direction: column;
  background: var(--mail-preview-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.6);
  overflow: hidden;
}
.mail-preview-toolbar {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.6rem 0.9rem;
  background: var(--mail-preview-toolbar);
  border-bottom: 1px solid var(--border);
}
.mail-preview-title {
  flex: 1;
  min-width: 0;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.mail-preview-btn {
  padding: 0.38rem 0.75rem;
  border-radius: 7px;
  border: 1px solid var(--border);
  background: var(--pill-bg);
  color: var(--text);
  font-size: 0.75rem;
  font-weight: 600;
  cursor: pointer;
  transition: border-color 0.12s, color 0.12s;
}
.mail-preview-btn:hover { border-color: var(--accent-bright); color: var(--accent-bright); }
.mail-preview-viewer {
  flex: 1;
  min-height: 0;
  overflow: auto;
  background: var(--mail-preview-viewer);
  display: flex;
  flex-direction: column;
  align-items: stretch;
  justify-content: flex-start;
  padding: 0.75rem;
}
.mail-preview-pdf-host,
.mail-inline-pdf-host {
  width: 100%;
  min-height: 0;
}
.mail-inline-pdf-viewer,
.pdf-viewer-root {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.85rem;
  width: 100%;
}
.mail-body-wrap--pdf {
  padding: 0.75rem 1rem 1rem;
}
.pdf-page-wrap {
  position: relative;
  display: inline-block;
  box-shadow: 0 2px 12px var(--shadow-soft);
  border-radius: 4px;
  overflow: hidden;
  background: #fff;
}
.pdf-page-canvas {
  display: block;
  width: 100%;
  height: auto;
}
.pdf-highlight-layer {
  position: absolute;
  left: 0;
  top: 0;
  pointer-events: none;
}
.pdf-search-hit {
  position: absolute;
  background: var(--mail-search-hit-bg);
  opacity: 0.92;
  border-radius: 2px;
  box-shadow: 0 0 0 1px rgba(0, 0, 0, 0.06);
  mix-blend-mode: multiply;
}
.mail-att-chip--matched {
  border-color: var(--accent-bright) !important;
  box-shadow: 0 0 0 2px var(--focus-ring);
}
.mail-preview-embed {
  flex: 1;
  width: 100%;
  height: 100%;
  min-height: 0;
  border: 0;
  background: #525252;
}
.mail-preview-image {
  display: block;
  max-width: 100%;
  max-height: 100%;
  width: auto;
  height: auto;
  object-fit: contain;
  border-radius: 4px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.35);
}
.mail-preview-loading {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--muted);
  font-size: 0.875rem;
  text-align: center;
  line-height: 1.5;
  padding: 1rem;
}

@media (max-width: 900px) {
  .mail-workspace { grid-template-columns: 1fr; }
  .mail-list-pane {
    max-height: 44vh;
    border-right: 0;
    border-bottom: 1px solid var(--border);
  }
}