:root {
  color-scheme: light dark;
  --background: #ffffff;
  --surface: #f8fafc;
  --surface-2: #eef2f7;
  --border: #d1d5db;
  --text: #111827;
  --muted: #64748b;
  --accent: #2563eb;
  --accent-text: #ffffff;
  --danger: #b91c1c;
  --success: #047857;
  --warning: #b45309;
  --font-ui: "Segoe UI", system-ui, sans-serif;
  --font-mono: Consolas, "Cascadia Mono", "SFMono-Regular", monospace;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  background: var(--background);
  color: var(--text);
  font-family: var(--font-ui);
  overflow: hidden;
}

.topbar {
  height: 56px;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  border-bottom: 1px solid var(--border);
  background: var(--surface);
}

.brand { min-width: 0; flex: 1; }
.title { font-size: 16px; font-weight: 650; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.subtitle { font-size: 12px; color: var(--muted); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.top-actions { display: flex; gap: 8px; align-items: center; }
.root-switch { display: inline-flex; align-items: center; gap: 8px; color: var(--muted); font-size: 13px; white-space: nowrap; }
.switch-button {
  width: 50px;
  height: 26px;
  position: relative;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface-2);
  color: var(--text);
  cursor: pointer;
}
.switch-thumb {
  position: absolute;
  top: 3px;
  left: 4px;
  width: 18px;
  height: 18px;
  border-radius: 999px;
  background: var(--accent);
  transition: left 140ms ease;
}
.switch-button.release .switch-thumb { left: 26px; }
.button, .icon-button {
  min-height: 34px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border);
  border-radius: 5px;
  padding: 0 12px;
  background: var(--surface);
  color: var(--text);
  font: 14px var(--font-ui);
  line-height: 1;
  cursor: pointer;
}
.button:hover, .icon-button:hover { border-color: var(--accent); color: var(--accent); }
.button.danger { color: var(--danger); }
.button.primary { border-color: var(--accent); background: var(--accent); color: var(--accent-text); }
.button.primary:hover { color: var(--accent-text); }
.button:disabled, .icon-button:disabled { cursor: default; opacity: 0.55; }
.add-queue-button { width: 38px; min-width: 38px; padding: 0; font-size: 22px; line-height: 1; }
.settings-menu { position: relative; }
.hamburger-button { width: 38px; min-width: 38px; padding: 0; display: inline-grid; place-items: center; }
.topbar .button, .topbar .icon-button { padding-bottom: 2px; }
.hamburger-icon,
.hamburger-icon::before,
.hamburger-icon::after {
  display: block;
  width: 18px;
  height: 2px;
  border-radius: 999px;
  background: currentColor;
}
.hamburger-icon { position: relative; transform: translateX(-2px); }
.hamburger-icon::before,
.hamburger-icon::after { content: ""; position: absolute; left: 0; }
.hamburger-icon::before { top: -6px; }
.hamburger-icon::after { top: 6px; }
.settings-panel {
  position: absolute;
  top: calc(100% + 6px);
  right: 0;
  z-index: 40;
  min-width: 190px;
  padding: 8px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--surface);
  box-shadow: 0 12px 28px rgba(15, 23, 42, 0.18);
}
.menu-section { display: grid; gap: 4px; padding: 6px 0; border-bottom: 1px solid var(--border); }
.distribution-menu-section { display: none; }
.menu-section:last-child { border-bottom: 0; }
.menu-heading { padding: 0 8px 2px; color: var(--muted); font-size: 12px; font-weight: 650; }
.menu-item {
  min-height: 30px;
  width: 100%;
  border: 0;
  border-radius: 5px;
  padding: 0 8px;
  background: transparent;
  color: var(--text);
  font: 14px var(--font-ui);
  text-align: left;
  cursor: pointer;
}
.menu-item:hover, .menu-item.active { background: var(--surface-2); color: var(--accent); }
.menu-item.active { font-weight: 650; }
.menu-item.active::before { content: ">"; display: inline-block; width: 18px; color: var(--accent); }
.menu-item:not(.active)::before { content: ""; display: inline-block; width: 18px; }

.shell {
  height: calc(100% - 56px);
  display: grid;
  grid-template-columns: 280px 18px minmax(0, 1fr);
  min-width: 0;
  min-height: 0;
}
.shell.tree-collapsed { grid-template-columns: 0 18px minmax(0, 1fr); }
.tree-pane { min-width: 0; overflow: auto; background: var(--surface); }
.shell.tree-collapsed .tree-pane { visibility: hidden; overflow: hidden; }
.tree-collapse-button {
  width: 18px;
  min-width: 18px;
  height: 100%;
  border: 0;
  border-right: 1px solid var(--border);
  border-left: 1px solid var(--border);
  border-radius: 0;
  padding: 0;
  background: var(--surface);
  color: var(--muted);
  font: 12px var(--font-mono);
  cursor: pointer;
}
.tree-collapse-button:hover { background: var(--surface-2); color: var(--accent); }
.tree { padding: 8px; }
.tree-group { margin-bottom: 8px; }
.tree-row {
  width: 100%;
  min-height: 34px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border: 0;
  border-radius: 5px;
  padding: 0 8px;
  background: transparent;
  color: var(--text);
  font: 14px var(--font-ui);
  text-align: left;
  cursor: pointer;
}
.tree-row:hover, .tree-row.active { background: var(--surface-2); color: var(--accent); }
.tree-parent { font-weight: 600; }
.tree-label { min-width: 0; display: inline-flex; align-items: center; gap: 7px; overflow: hidden; }
.tree-arrow { width: 12px; flex: 0 0 12px; color: var(--muted); font: 12px var(--font-mono); }
.tree-children { margin-left: 19px; display: grid; gap: 2px; }
.tree-child {
  width: 100%;
  min-height: 30px;
  border: 0;
  border-radius: 5px;
  padding: 0 8px;
  background: transparent;
  color: var(--muted);
  font: 13px var(--font-ui);
  text-align: left;
  cursor: pointer;
}
.tree-child:hover, .tree-child.active { background: var(--surface-2); color: var(--accent); }
.workspace {
  min-width: 0;
  min-height: 0;
  display: grid;
  grid-template-rows: auto minmax(0, 1fr);
  background: var(--background);
  overflow: hidden;
}
.tabs {
  display: flex;
  gap: 4px;
  min-height: 42px;
  padding: 6px 8px 0;
  border-bottom: 1px solid var(--border);
  overflow-x: auto;
}
.tab {
  min-width: 120px;
  max-width: 220px;
  height: 35px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border: 1px solid var(--border);
  border-bottom: 0;
  border-radius: 6px 6px 0 0;
  padding: 0 8px 0 12px;
  background: var(--surface);
  color: var(--text);
  font: 14px var(--font-ui);
  cursor: pointer;
}
.tab.active { background: var(--background); color: var(--accent); font-weight: 650; }
.tab-title { min-width: 0; flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; text-align: left; }
.tab-close { border: 0; background: transparent; color: var(--muted); cursor: pointer; font-size: 16px; }
.empty-state { display: grid; place-items: center; color: var(--muted); font-size: 15px; }
.viewer {
  min-height: 0;
  display: grid;
  grid-template-rows: minmax(0, 1fr);
  overflow: hidden;
  padding: 12px;
}
.loading { color: var(--muted); font-size: 14px; padding: 8px; }
.queue-view-panel {
  height: 100%;
  min-height: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  grid-template-rows: auto minmax(0, 1fr);
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--surface);
  overflow: hidden;
}
.queue-view-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
}
.queue-view-title { font-size: 15px; font-weight: 700; }
.queue-view-meta, .queue-view-count { color: var(--muted); font-size: 12px; }
.queue-view-count { white-space: nowrap; }
.queue-grid {
  min-height: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  align-items: stretch;
  overflow: hidden;
}
.queue-column {
  min-width: 0;
  min-height: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  grid-template-rows: auto minmax(0, 1fr);
  background: var(--surface);
  overflow: hidden;
}
.queue-column + .queue-column { border-left: 1px solid var(--border); }
.queue-header { min-width: 0; display: flex; justify-content: space-between; gap: 8px; padding: 10px 12px; border-bottom: 1px solid var(--border); background: var(--background); overflow: hidden; }
.queue-header > div { min-width: 0; }
.queue-title { font-size: 15px; font-weight: 650; }
.queue-meta { color: var(--muted); font-size: 12px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.queue-sections { display: grid; grid-template-columns: 1fr 1fr; min-height: 240px; }
.queue-section { min-width: 0; padding: 10px; }
.queue-section-full {
  width: 100%;
  min-height: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  grid-template-rows: auto minmax(0, 1fr);
  overflow: hidden;
}
.queue-list {
  width: 100%;
  max-width: 100%;
  min-width: 0;
  min-height: 0;
  overflow-x: hidden;
  overflow-y: scroll;
  padding-right: 4px;
  scrollbar-gutter: stable;
  scrollbar-color: var(--muted) var(--surface-2);
  scrollbar-width: thin;
}
.queue-list::-webkit-scrollbar { width: 11px; }
.queue-list::-webkit-scrollbar-track { background: var(--surface-2); }
.queue-list::-webkit-scrollbar-thumb {
  border: 2px solid var(--surface-2);
  border-radius: 999px;
  background: var(--muted);
}
.queue-list::-webkit-scrollbar-thumb:hover { background: var(--accent); }
.queue-section + .queue-section { border-left: 1px solid var(--border); }
.section-title { margin-bottom: 8px; font-size: 12px; font-weight: 700; color: var(--muted); text-transform: uppercase; }
.queue-item {
  width: 100%;
  max-width: 100%;
  min-width: 0;
  border: 1px solid var(--border);
  border-radius: 5px;
  padding: 8px;
  margin-bottom: 8px;
  background: var(--background);
  overflow-x: hidden;
}
.queue-item-content { width: 100%; min-width: 0; }
.queue-item.front { border-color: var(--accent); }
.item-row { min-width: 0; display: flex; flex-wrap: wrap; justify-content: space-between; gap: 4px 8px; font-size: 13px; }
.item-name { min-width: 0; overflow-wrap: anywhere; }
.item-status { color: var(--muted); white-space: nowrap; }
.item-detail { min-width: 0; margin-top: 4px; color: var(--muted); font: 12px var(--font-mono); white-space: normal; overflow-wrap: anywhere; }
.progress-row { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 8px; align-items: center; margin-top: 8px; }
.progress-track { height: 6px; border-radius: 999px; background: var(--surface-2); overflow: hidden; }
.progress-fill { height: 100%; width: 0; background: var(--accent); }
.progress-value { color: var(--muted); font: 12px var(--font-mono); }
.missing { color: var(--warning); font-size: 13px; padding: 8px; }
.settings-dialog {
  width: min(520px, calc(100vw - 24px));
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0;
  background: var(--surface);
  color: var(--text);
  box-shadow: 0 18px 42px rgba(15, 23, 42, 0.28);
}
.settings-dialog::backdrop { background: rgba(15, 23, 42, 0.56); }
.settings-dialog-shell { display: grid; grid-template-rows: auto auto auto; }
.settings-dialog-body { display: grid; gap: 12px; padding: 12px; }
.settings-section { border-bottom: 1px solid var(--border); padding-bottom: 12px; }
.settings-section:last-child { border-bottom: 0; padding-bottom: 0; }
.settings-section h3 { margin: 0 0 8px; font-size: 13px; }
.settings-control, .settings-toggle { display: flex; align-items: center; justify-content: space-between; gap: 12px; color: var(--muted); font-size: 13px; }
.settings-control .dialog-select { width: min(220px, 60%); }
.settings-toggle input { width: 18px; height: 18px; accent-color: var(--accent); }
.settings-dialog-footer { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 12px; align-items: center; padding: 10px 12px; border-top: 1px solid var(--border); }
.settings-dialog-footer .dialog-message { min-width: 0; }
.queue-add-dialog {
  width: min(620px, calc(100vw - 24px));
  max-height: min(760px, calc(100vh - 24px));
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0;
  background: var(--surface);
  color: var(--text);
  box-shadow: 0 18px 42px rgba(15, 23, 42, 0.28);
}
.queue-add-dialog::backdrop { background: rgba(15, 23, 42, 0.56); }
.queue-add-form {
  min-height: 0;
  max-height: calc(100vh - 26px);
  display: grid;
  grid-template-rows: auto minmax(0, 1fr) auto;
}
.dialog-header {
  min-height: 48px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 8px 12px;
  border-bottom: 1px solid var(--border);
}
.dialog-header h2 { margin: 0; font-size: 16px; font-weight: 700; }
.dialog-close {
  width: 32px;
  height: 32px;
  border: 0;
  background: transparent;
  color: var(--muted);
  font: 18px var(--font-ui);
  cursor: pointer;
}
.dialog-close:hover { color: var(--accent); }
.dialog-body { min-height: 0; display: grid; grid-template-rows: auto auto minmax(180px, 1fr) auto; gap: 12px; padding: 12px; }
.dialog-field { min-width: 0; display: grid; gap: 5px; color: var(--muted); font-size: 12px; font-weight: 650; }
.dialog-select, .dialog-input {
  width: 100%;
  min-width: 0;
  min-height: 36px;
  border: 1px solid var(--border);
  border-radius: 5px;
  padding: 6px 8px;
  background: var(--background);
  color: var(--text);
  font: 14px var(--font-ui);
}
.dialog-input { color: var(--muted); font-family: var(--font-mono); }
.path-browser { min-height: 0; display: grid; grid-template-rows: auto minmax(0, 1fr); border: 1px solid var(--border); border-radius: 5px; overflow: hidden; }
.path-browser-toolbar { min-width: 0; display: flex; align-items: center; gap: 8px; padding: 6px; border-bottom: 1px solid var(--border); background: var(--background); }
.path-up-button { width: 32px; min-width: 32px; min-height: 30px; padding: 0; }
.browser-path { min-width: 0; overflow: hidden; color: var(--muted); font: 12px var(--font-mono); text-overflow: ellipsis; white-space: nowrap; }
.path-entries { min-height: 0; overflow-y: auto; padding: 5px; background: var(--surface); }
.path-entry {
  width: 100%;
  min-height: 34px;
  display: flex;
  align-items: center;
  gap: 8px;
  border: 0;
  border-radius: 4px;
  padding: 5px 8px;
  background: transparent;
  color: var(--text);
  font: 13px var(--font-ui);
  text-align: left;
  cursor: pointer;
}
.path-entry::before { width: 12px; flex: 0 0 12px; color: var(--muted); content: ""; }
.path-entry.directory::before { content: ">"; }
.path-entry:hover, .path-entry.selected { background: var(--surface-2); color: var(--accent); }
.path-entry-name { min-width: 0; overflow-wrap: anywhere; }
.path-empty { padding: 12px 8px; color: var(--muted); font-size: 13px; }
.dialog-message { min-height: 18px; color: var(--muted); font-size: 12px; }
.dialog-message.error { color: var(--danger); }
.dialog-message.success { color: var(--success); }
.dialog-actions { display: flex; justify-content: flex-end; gap: 8px; padding: 10px 12px; border-top: 1px solid var(--border); }
.hidden { display: none !important; }
.mobile-only { display: none; }

@media (max-width: 760px) {
  .mobile-only { display: inline-grid; }
  .root-switch { display: none; }
  .distribution-menu-section { display: grid; }
  .shell, .shell.tree-collapsed { grid-template-columns: minmax(0, 1fr); }
  .tree-pane { display: none; }
  .shell.tree-collapsed .tree-pane { visibility: visible; }
  .tree-pane.open { display: block; position: absolute; inset: 56px auto 0 0; z-index: 30; width: min(320px, 85vw); }
  .tree-collapse-button { display: none; }
  .queue-grid { grid-template-columns: minmax(0, 1fr); }
  .queue-column + .queue-column { border-left: 0; border-top: 1px solid var(--border); }
  .queue-sections { grid-template-columns: 1fr; }
  .queue-section + .queue-section { border-left: 0; border-top: 1px solid var(--border); }
  .queue-add-dialog { width: calc(100vw - 16px); max-height: calc(100vh - 16px); }
  .queue-add-form { max-height: calc(100vh - 18px); }
  .settings-dialog { width: calc(100vw - 16px); }
  .settings-dialog-footer { grid-template-columns: 1fr; }
  .settings-dialog-footer .button { width: 100%; }
}