:root {
  color-scheme: light;
  --bg: #f1f5f9;
  --panel: #f8fafc;
  --panel-2: #ffffff;
  --control-bg: var(--panel-2);
  --control-bg-hover: var(--panel);
  --control-bg-active: rgba(15, 23, 42, 0.03);
  --muted: #64748b;
  --text: #0f172a;
  --border: rgba(15, 23, 42, 0.14);
  --accent: #2563eb;
  --accent-border: rgba(37, 99, 235, 0.55);
  --accent-border-strong: rgba(37, 99, 235, 0.85);
  --accent-inset: rgba(37, 99, 235, 0.12);
  --danger: #ef4444;
  --ok: #10b981;
  --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.08);
  --shadow-md: 0 14px 40px rgba(15, 23, 42, 0.1);
  --card-bg: var(--panel-2);
  --card-bg-hover: #f3f6ff;
  --card-border: rgba(15, 23, 42, 0.1);
  --row-hover: rgba(37, 99, 235, 0.06);
  --drop-border: rgba(15, 23, 42, 0.18);
  --chrome-bg: rgba(248, 250, 252, 0.88);
  --canvas-outline: rgba(15, 23, 42, 0.65);
}

/* 工具类 */
.hidden {
  display: none !important;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    color-scheme: dark;
    --bg: #0b0d10;
    --panel: #12161c;
    --panel-2: #0f1318;
    --control-bg: var(--panel-2);
    --control-bg-hover: rgba(255, 255, 255, 0.06);
    --control-bg-active: rgba(255, 255, 255, 0.09);
    --muted: #9aa4b2;
    --text: #e7edf6;
    --border: rgba(255, 255, 255, 0.12);
    --accent: #77b3ff;
    --accent-border: rgba(119, 179, 255, 0.55);
    --accent-border-strong: rgba(119, 179, 255, 0.85);
    --accent-inset: rgba(119, 179, 255, 0.12);
    --danger: #ff6b6b;
    --ok: #6ee7b7;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.55);
    --shadow-md: 0 18px 50px rgba(0, 0, 0, 0.45);
    --card-bg: rgba(255, 255, 255, 0.03);
    --card-bg-hover: rgba(255, 255, 255, 0.05);
    --card-border: rgba(255, 255, 255, 0.1);
    --row-hover: rgba(119, 179, 255, 0.07);
    --drop-border: rgba(255, 255, 255, 0.18);
    --chrome-bg: rgba(18, 22, 28, 0.9);
    --canvas-outline: rgba(255, 255, 255, 0.62);
  }
}

:root[data-theme="light"] {
  color-scheme: light;
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #0b0d10;
  --panel: #12161c;
  --panel-2: #0f1318;
  --control-bg: var(--panel-2);
  --control-bg-hover: rgba(255, 255, 255, 0.06);
  --control-bg-active: rgba(255, 255, 255, 0.09);
  --muted: #9aa4b2;
  --text: #e7edf6;
  --border: rgba(255, 255, 255, 0.12);
  --accent: #77b3ff;
  --accent-border: rgba(119, 179, 255, 0.55);
  --accent-border-strong: rgba(119, 179, 255, 0.85);
  --accent-inset: rgba(119, 179, 255, 0.12);
  --danger: #ff6b6b;
  --ok: #6ee7b7;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.55);
  --shadow-md: 0 18px 50px rgba(0, 0, 0, 0.45);
  --card-bg: rgba(255, 255, 255, 0.03);
  --card-bg-hover: rgba(255, 255, 255, 0.05);
  --card-border: rgba(255, 255, 255, 0.1);
  --row-hover: rgba(119, 179, 255, 0.07);
  --drop-border: rgba(255, 255, 255, 0.18);
  --chrome-bg: rgba(18, 22, 28, 0.9);
  --canvas-outline: rgba(255, 255, 255, 0.62);
}

body {
  background: var(--bg);
  color: var(--text);
  font-family:
    ui-sans-serif,
    system-ui,
    -apple-system,
    "Segoe UI",
    Roboto,
    "Noto Sans CJK SC",
    "PingFang SC",
    "Hiragino Sans GB",
    "Microsoft YaHei",
    sans-serif;
  display: flex;
  flex-direction: column;
  min-height: 100%;
}

.mono {
  font-family:
    ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono",
    "Courier New", monospace;
}

.muted {
  color: var(--muted);
  font-size: 12px;
  line-height: 1.4;
}

.toolbar {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
  background: var(--chrome-bg);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.toolbar__left,
.toolbar__right {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  min-width: 0;
}

.file-input {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 6px 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  cursor: pointer;
  user-select: none;
  background: var(--control-bg);
  box-shadow: var(--shadow-sm);
}

.file-input input {
  display: none;
}

button,
select {
  background: var(--control-bg);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 6px 10px;
}

button {
  cursor: pointer;
}

button:hover:not(:disabled),
select:hover {
  background: var(--control-bg-hover);
  border-color: var(--accent-border);
}

button:active:not(:disabled) {
  background: var(--control-bg-active);
  border-color: var(--accent-border-strong);
}

button:focus,
select:focus,
.session-picker__search:focus,
.file-input:focus-within {
  outline: 2px solid var(--accent-border);
  outline-offset: 2px;
}

button:focus:not(:focus-visible),
select:focus:not(:focus-visible),
.session-picker__search:focus:not(:focus-visible) {
  outline: none;
}

button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.playback {
  display: flex;
  align-items: center;
  gap: 8px;
}

.timeline {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 200px;
}

.timeline input[type="range"] {
  width: min(44vw, 520px);
}

.layout {
  display: grid;
  grid-template-columns: 280px 1fr 360px;
  flex: 1 1 auto;
  min-height: 0;
  min-width: 0;
}

.list-panel,
.viewport,
.side-panel {
  min-width: 0;
  min-height: 0;
}

.list-panel {
  background: var(--panel);
  border-right: 1px solid var(--border);
  overflow: auto;
  padding: 12px;
}

.list-actions {
  display: flex;
  gap: 8px;
  margin-bottom: 8px;
  align-items: center;
  flex-wrap: wrap;
}

.segmented {
  display: inline-flex;
  align-items: center;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--control-bg);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}

.segmented__button {
  border: 0;
  border-radius: 0;
  background: transparent;
  padding: 6px 10px;
  box-shadow: none;
  min-width: 52px;
}

.segmented__button:hover:not(:disabled) {
  background: var(--control-bg-hover);
}

.segmented__button:active:not(:disabled) {
  background: var(--control-bg-active);
}

.segmented__button:focus {
  outline: 2px solid var(--accent-border);
  outline-offset: -2px;
}

.segmented__button:focus:not(:focus-visible) {
  outline: none;
}

.segmented__button + .segmented__button {
  border-left: 1px solid var(--border);
}

.segmented__button--active {
  background: var(--control-bg-active);
  color: var(--accent);
  font-weight: 600;
  box-shadow: 0 0 0 1px var(--accent-border) inset;
}

.session-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 8px;
}

.session-list--grid {
  grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
}

.session-list--grid .session-list__item {
  padding: 8px 8px;
}

.session-list--grid .session-item__title {
  margin-bottom: 2px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.session-list--grid .session-item__meta {
  font-size: 11px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.session-list__group {
  list-style: none;
  color: var(--muted);
  font-size: 12px;
  letter-spacing: 0.02em;
  margin-top: 6px;
}

.session-list__group--folder {
  font-size: 11px;
  margin-top: 2px;
  padding-left: 10px;
  border-left: 2px solid var(--border);
}

.session-list__folder {
  list-style: none;
  min-width: 0;
  display: grid;
  gap: 8px;
}

.session-list__folder-list {
  min-width: 0;
  padding-left: 10px;
}

.session-list--grid .session-list__group {
  grid-column: 1 / -1;
}

.session-list--grid .session-list__folder {
  grid-column: 1 / -1;
}

.session-list--grid .session-list__folder-list {
  padding-left: 0;
  grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
}

.session-picker .session-list--grid .session-list__folder-list {
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
}

.session-list__item {
  width: 100%;
  text-align: left;
  padding: 10px 10px;
  border-radius: 10px;
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  box-shadow: var(--shadow-sm);
  cursor: pointer;
}

.session-list__item:hover {
  background: var(--card-bg-hover);
  border-color: var(--accent-border);
}

.session-list__item--active {
  border-color: var(--accent-border-strong);
  box-shadow:
    0 0 0 2px var(--accent-inset) inset,
    var(--shadow-sm);
}

.session-item__title {
  font-size: 13px;
  margin-bottom: 4px;
  color: var(--text);
  overflow-wrap: anywhere;
  word-break: break-all;
}

.session-item__meta {
  font-size: 12px;
  color: var(--muted);
}

.session-picker {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: grid;
  place-items: center;
  padding: 18px;
  background: rgba(15, 23, 42, 0.45);
}

.session-picker__surface {
  width: min(1120px, 100%);
  max-height: min(860px, 92vh);
  display: grid;
  grid-template-rows: auto 1fr;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 14px;
  box-shadow: var(--shadow-md);
  overflow: hidden;
}

.session-picker__header {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 10px;
  border-bottom: 1px solid var(--border);
  background: var(--panel-2);
}

.session-picker__title {
  color: var(--muted);
  font-size: 13px;
  flex: 0 0 auto;
}

.session-picker__search {
  flex: 1 1 auto;
  min-width: 180px;
  background: var(--control-bg);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 6px 10px;
}

.session-picker__content {
  overflow: auto;
  padding: 12px;
}

.session-picker .session-list--grid {
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
}

.viewport {
  position: relative;
  overflow: hidden;
  border-right: 1px solid var(--border);
  touch-action: none;
}

.canvas-stack {
  position: absolute;
  inset: 0;
}

.canvas-stack canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.drop-hint {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  text-align: center;
  color: var(--muted);
  border: 2px dashed var(--drop-border);
  margin: 16px;
  border-radius: 12px;
  pointer-events: none;
}

.side-panel {
  background: var(--panel);
  overflow: auto;
  padding: 12px;
}

.panel-section {
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 10px 10px;
  margin-bottom: 12px;
  background: var(--panel-2);
  box-shadow: var(--shadow-sm);
}

.panel-section h2 {
  margin: 0 0 8px 0;
  font-size: 14px;
  color: var(--muted);
}

.kv {
  display: grid;
  gap: 4px;
  overflow-wrap: anywhere;
  word-break: break-all;
}

.list {
  margin: 0;
  padding-left: 18px;
  list-style-position: inside;
  overflow-wrap: anywhere;
  word-break: break-all;
}

details summary {
  cursor: pointer;
  color: var(--muted);
  margin: 6px 0;
}

.table {
  width: 100%;
  border-collapse: collapse;
  font-size: 12px;
}

.table th,
.table td {
  text-align: left;
  border-top: 1px solid var(--border);
  padding: 6px 6px;
  vertical-align: top;
  overflow-wrap: anywhere;
  word-break: break-all;
}

.table tbody tr:hover {
  background: var(--row-hover);
}

.statusbar {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  background: var(--chrome-bg);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.view-options {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
}

.toggle {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--control-bg);
  user-select: none;
}

.toggle:hover {
  border-color: var(--accent-border);
}

.toggle input {
  margin: 0;
}

.theme {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--control-bg);
}

.theme:hover {
  border-color: var(--accent-border);
}

.range {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--control-bg);
  user-select: none;
}

.range:hover {
  border-color: var(--accent-border);
}

.range input[type="range"] {
  width: 120px;
}

.range span {
  min-width: 3ch;
  text-align: right;
}

input[type="checkbox"],
input[type="range"] {
  accent-color: var(--accent);
}

@media (max-width: 980px) {
  .layout {
    grid-template-columns: 1fr;
  }

  .list-panel {
    border-right: none;
    border-bottom: 1px solid var(--border);
  }

  .viewport {
    border-right: none;
    border-bottom: 1px solid var(--border);
  }

  .timeline input[type="range"] {
    width: min(56vw, 520px);
  }
}