.subtitle-app main {
  max-width: 1280px;
}

.export-actions {
  position: relative;
}

.export-menu {
  position: absolute;
  top: calc(100% + 10px);
  right: 0;
  z-index: 20;
  display: grid;
  gap: 8px;
  min-width: 148px;
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.82);
  box-shadow: 0 18px 40px rgba(var(--shadow-rgb), 0.16);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  opacity: 0;
  transform: translateY(-8px) scale(0.98);
  transform-origin: top right;
  transition:
    opacity 160ms ease,
    transform 160ms ease;
}

.export-menu[hidden] {
  display: none;
}

.export-menu.is-open {
  opacity: 1;
  transform: translateY(0) scale(1);
}

.export-menu button {
  justify-content: center;
  width: 100%;
  border-radius: 12px;
  background: rgba(var(--accent-rgb), 0.08);
  color: var(--accent-deep);
  text-align: center;
}

.export-menu button:hover {
  background: rgba(var(--accent-rgb), 0.16);
  color: var(--accent-deep);
}

.dark-mode .export-menu {
  background: rgba(24, 43, 45, 0.86);
}

.dark-mode .export-menu button {
  background: rgba(var(--accent-rgb), 0.13);
  color: var(--accent-deep);
}

.dark-mode .export-menu button:hover {
  background: rgba(var(--accent-rgb), 0.2);
  color: var(--ink);
}

#exportMenuButton {
  border-color: rgba(var(--accent-rgb), 0.3);
  background: var(--accent);
  color: #f7fffb;
  box-shadow: 0 12px 28px rgba(var(--shadow-rgb), 0.13);
}

#exportMenuButton:hover,
#exportMenuButton[aria-expanded="true"] {
  background: var(--accent-deep);
  color: #f7fffb;
  border-color: rgba(var(--accent-rgb), 0.45);
}

#exportMenuButton:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.subtitle-app .version-inputs {
  padding-top: 4px;
}

.subtitle-app .student-panel {
  min-height: 136px;
}

.student-panel.has-file {
  min-height: 136px;
}

.student-panel.has-file .file-panel-body {
  display: flex;
}

.student-panel.has-file .panel-heading {
  min-height: 52px;
}

.student-panel.has-file .file-upload {
  display: none;
}

.file-action-buttons {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  width: min(100%, 354px);
}

.file-action-buttons[hidden] {
  display: none;
}

.student-panel .replace-file,
.student-panel .hide-version {
  min-height: 64px;
  border: 1px dashed var(--line);
  background: var(--input-surface);
  color: var(--muted);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  cursor: pointer;
  padding: 12px;
  border-radius: 14px;
}

.student-panel .hide-version {
  border-color: rgba(165, 73, 73, 0.28);
  color: var(--danger);
  background: rgba(165, 73, 73, 0.08);
}

.student-panel.is-hidden-version .hide-version {
  border-color: rgba(var(--accent-rgb), 0.32);
  color: var(--accent-deep);
  background: var(--panel-soft);
}

.student-panel .replace-file:hover,
.student-panel .hide-version:hover {
  color: var(--accent-deep);
  background: var(--input-surface-focus);
  border-color: rgba(var(--accent-rgb), 0.35);
}

.file-panel-body {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 8px 14px 10px;
}

.student-panel .file-upload {
  display: flex;
  justify-content: center;
  width: 100%;
  min-height: 0;
  padding: 0;
  border-bottom: 0;
  border: 0;
  color: inherit;
  font-weight: inherit;
}

.file-upload input[type="file"] {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
  overflow: hidden;
}

.file-upload-label {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 64px;
  width: min(100%, 354px);
  padding: 12px;
  border-radius: 14px;
  border: 1px dashed var(--line);
  color: var(--muted);
  background: var(--input-surface);
  cursor: pointer;
  text-align: center;
  font-weight: 600;
  line-height: 1.4;
}

.file-upload-label:hover,
.file-upload:focus-within .file-upload-label {
  color: var(--accent-deep);
  background: var(--input-surface-focus);
  border-color: rgba(var(--accent-rgb), 0.35);
}

.display-controls {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
}

.subtitle-app .controls {
  display: flex;
  justify-content: center;
  text-align: center;
  padding: 0;
  border: 0;
  border-radius: 0;
  background: transparent;
  box-shadow: none;
  backdrop-filter: none;
  -webkit-backdrop-filter: none;
}

.timestamp-toggle {
  margin-right: 4px;
}

.subtitle-grid.timestamps-hidden .timestamp-head,
.subtitle-grid.timestamps-hidden .timestamp-cell {
  display: none;
}

.subtitle-grid .timestamp-cell textarea {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.88em;
}

.subtitle-grid .timestamp-toggle-head {
  cursor: pointer;
}

.subtitle-grid .timestamp-toggle-head:hover {
  color: var(--accent-deep);
}

.subtitle-grid .timestamp-head {
  background: var(--row-number-head-bg);
}

.alignment-table.is-sticky-headers.subtitle-grid .head {
  opacity: 1;
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}

.match-flag {
  display: inline-block;
  margin-left: 6px;
  padding: 1px 6px;
  border-radius: 999px;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  color: var(--danger-deep);
  background: rgba(165, 73, 73, 0.14);
}

.alignment-table.grid.subtitle-grid .row-number .row-index {
  font-variant-numeric: tabular-nums;
}