/* Yunti uses a neutral palette and follows the operating system theme. */
:root {
  color-scheme: light;
  --bg: #f6f6f6;
  --panel: #fafafa;
  --panel-raised: #ffffff;
  --panel-inset: #f1f1f1;
  --editor-bg: #ffffff;
  --header-bg: #ffffff;
  --rail-bg: #f2f2f2;
  --status-bg: #ededed;
  --border: #dedede;
  --border-soft: #ebebeb;
  --border-strong: #c5c5c5;
  --text: #202020;
  --text-secondary: #4c4c4c;
  --muted: #676767;
  --subtle: #737373;
  --accent: #202020;
  --on-accent: #ffffff;
  --accent-hover: #414141;
  --hover: rgba(0, 0, 0, 0.045);
  --selected: rgba(0, 0, 0, 0.075);
  --focus: #595959;
  --focus-soft: rgba(0, 0, 0, 0.2);
  --badge-bg: #eeeeee;
  --line-number: #767676;
  --scrollbar: #c7c7c7;
  --scrollbar-hover: #a0a0a0;
  --pointer-glow: rgba(95, 95, 95, 0.095);
  --pointer-glow-edge: rgba(95, 95, 95, 0);
  --dialog-shadow: rgba(0, 0, 0, 0.18);
  --overlay-shadow: rgba(0, 0, 0, 0.12);
  --backdrop: rgba(0, 0, 0, 0.35);
  --toast-bg: #252525;
  --toast-text: #f8f8f8;
  --toast-border: #4e4e4e;
  font-family: Inter, "Segoe UI", "Microsoft YaHei", sans-serif;
  font-size: 13px;
}

@media (prefers-color-scheme: dark) {
  :root {
    color-scheme: dark;
    --bg: #101010;
    --panel: #151515;
    --panel-raised: #1d1d1d;
    --panel-inset: #111111;
    --editor-bg: #121212;
    --header-bg: #171717;
    --rail-bg: #111111;
    --status-bg: #1c1c1c;
    --border: #303030;
    --border-soft: #252525;
    --border-strong: #484848;
    --text: #ededed;
    --text-secondary: #c4c4c4;
    --muted: #a3a3a3;
    --subtle: #969696;
    --accent: #ededed;
    --on-accent: #171717;
    --accent-hover: #cccccc;
    --hover: rgba(255, 255, 255, 0.055);
    --selected: rgba(255, 255, 255, 0.095);
    --focus: #bfbfbf;
    --focus-soft: rgba(255, 255, 255, 0.3);
    --badge-bg: #292929;
    --line-number: #858585;
    --scrollbar: #414141;
    --scrollbar-hover: #606060;
    --pointer-glow: rgba(255, 255, 255, 0.065);
    --pointer-glow-edge: rgba(255, 255, 255, 0);
    --dialog-shadow: rgba(0, 0, 0, 0.55);
    --overlay-shadow: rgba(0, 0, 0, 0.4);
    --backdrop: rgba(0, 0, 0, 0.65);
    --toast-bg: #eeeeee;
    --toast-text: #202020;
    --toast-border: #cccccc;
  }
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
body { margin: 0; background: var(--bg); color: var(--text); }
button, input, textarea, select { font: inherit; }
button, a, input, textarea, select { outline-offset: 4px; }
button { cursor: pointer; color: inherit; border: 0; background: transparent; }
button:hover { background: var(--hover); }
button:disabled { cursor: not-allowed; opacity: 0.45; }
button:focus-visible, a:focus-visible, input:focus-visible,
textarea:focus-visible, select:focus-visible { outline: 2px solid var(--focus); }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
input { color: var(--text); }
input::placeholder, textarea::placeholder { color: var(--subtle); opacity: 1; }
::selection { color: var(--on-accent); background: var(--accent); }
i { display: inline-block; width: 6px; height: 6px; border-radius: 50%; background: var(--accent); }

/* Header and workspace structure. */
.topbar {
  height: 66px;
  display: flex;
  align-items: center;
  padding: 0 25px;
  gap: 19px;
  border-bottom: 1px solid var(--border);
  background: var(--header-bg);
}
.brand { display: flex; align-items: center; gap: 10px; color: var(--text); text-decoration: none !important; }
.brand strong { font-size: 21px; letter-spacing: 3px; }
.brandmark { color: var(--accent); font-size: 31px; transform: rotate(-13deg); }
.brand-en { color: var(--muted); letter-spacing: 2px; font-size: 10px; }
.top-divider { height: 21px; width: 1px; background: var(--border); }
.project-name { font-size: 12px; }
.chevron { color: var(--muted); margin-left: 12px; }
.prototype {
  color: var(--muted);
  background: var(--badge-bg);
  border: 1px solid var(--border);
  padding: 3px 7px;
  border-radius: 4px;
  font-size: 10px;
}
.top-right { margin-left: auto; display: flex; gap: 22px; align-items: center; }
.presence { font-size: 11px; color: var(--muted); }
.presence i { margin-right: 7px; }
.quiet { font-size: 11px; color: var(--text-secondary); padding: 7px 10px; border: 1px solid var(--border); border-radius: 5px; }
.avatar { display: grid; place-items: center; width: 29px; height: 29px; border-radius: 50%; background: var(--badge-bg); color: var(--text-secondary); font-size: 11px; }
.workspace {
  display: grid;
  grid-template-columns: 56px 218px minmax(350px, 1fr) 340px;
  height: calc(100dvh - 94px);
  min-height: 620px;
}
.rail { display: flex; align-items: center; flex-direction: column; border-right: 1px solid var(--border); padding: 15px 0; gap: 12px; background: var(--rail-bg); }
.rail-button { width: 38px; height: 38px; font-size: 23px; color: var(--muted); border-radius: 6px; }
.rail-button.active { color: var(--accent); background: var(--selected); }
.rail-bottom { margin-top: auto; }
.rail-bottom button { font-size: 15px; }

/* Explorer: a decorative glow sits behind content and never intercepts input. */
.explorer {
  position: relative;
  isolation: isolate;
  min-height: 0;
  border-right: 1px solid var(--border);
  background: var(--panel);
  padding: 20px 12px;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}
.explorer::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  border-radius: inherit;
  background: radial-gradient(
    180px circle at var(--pointer-x, 50%) var(--pointer-y, 30%),
    var(--pointer-glow), var(--pointer-glow-edge) 100%
  );
  opacity: 0;
  pointer-events: none;
  transition: opacity 180ms ease;
}
#file-particles { position: absolute; inset: 0; z-index: 4; display: block; width: 100%; height: 100%; pointer-events: none; opacity: .92; }
#file-particles.particle-flash { animation: particle-flash 360ms ease-out; }
@keyframes particle-flash { 0% { opacity: .65; } 22% { opacity: 1; } 100% { opacity: .92; } }
@media (hover: hover) and (pointer: fine) {
  .explorer.pointer-inside::before { opacity: 1; }
}
.section-title { display: flex; align-items: center; justify-content: space-between; padding: 0 6px; color: var(--text-secondary); font-size: 12px; flex-shrink: 0; }
.explorer-actions { display: flex; align-items: center; gap: 2px; }
.icon-button { font-size: 21px; color: var(--muted); border-radius: 4px; padding: 0 5px; }
.explorer-actions .icon-button { display: grid; place-items: center; width: 25px; height: 27px; font-size: 19px; }
.file-search { display: flex; align-items: center; gap: 7px; background: var(--panel-inset); border: 1px solid var(--border); border-radius: 5px; margin: 19px 3px 15px; padding: 5px 8px; color: var(--muted); flex-shrink: 0; }
.file-search:focus-within { border-color: var(--focus); }
.file-search input { width: 100%; min-width: 0; background: transparent; border: 0; padding: 3px; font-size: 11px; }
.file-search input:focus-visible { outline-offset: 1px; }
.file-tree { flex: 1; min-height: 0; overflow: auto; padding: 2px 1px 10px; scrollbar-gutter: stable; }
.folder-toggle {
  display: flex;
  align-items: center;
  gap: 7px;
  width: 100%;
  min-width: 0;
  padding: 8px 9px;
  border-radius: 4px;
  color: var(--text-secondary);
  font-size: 11px;
  text-align: left;
}
.folder-toggle > span:last-child { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.folder-chevron { display: inline-block; flex: 0 0 10px; width: 10px; color: var(--muted); font-size: 16px; line-height: 1; text-align: center; transition: transform 140ms ease; }
.folder-toggle[aria-expanded="true"] > .folder-chevron { transform: rotate(90deg); }
.folder-children { margin-left: 13px; padding-left: 7px; border-left: 1px solid var(--border-soft); }
.project-folder { flex-shrink: 0; font-size: 10px; letter-spacing: 0.5px; margin: 0 0 8px; color: var(--text-secondary); }
.folder-label { font-size: 11px; color: var(--muted); margin: 12px 12px 6px; }
.file-button { display: flex; align-items: center; gap: 9px; text-align: left; width: 100%; padding: 9px 11px; border-radius: 4px; color: var(--text-secondary); font-size: 11px; overflow: hidden; }
.file-button .filename { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.file-button.active { background: var(--selected); color: var(--text); }
.file-icon, .file-icon.py, .file-icon.md { font-size: 10px; color: var(--muted); min-width: 16px; }
.file-button.active .file-icon { color: var(--text-secondary); }
.explorer-bottom { margin-top: auto; padding: 25px 6px 0; flex-shrink: 0; }
.small-label { font-size: 9px; letter-spacing: 1.4px; color: var(--subtle); margin-bottom: 15px; }
.workspace-info { display: flex; align-items: center; gap: 9px; font-size: 12px; }
.mini-mark { background: var(--badge-bg); color: var(--text-secondary); padding: 8px; border-radius: 5px; }
.workspace-info small { display: block; margin-top: 5px; font-size: 10px; color: var(--muted); }
.local-note { border-top: 1px solid var(--border); margin-top: 22px; padding-top: 15px; color: var(--muted); font-size: 10px; }
.local-note i { width: 5px; height: 5px; margin-right: 7px; }

/* Main editor and output. */
.main { min-width: 0; display: flex; flex-direction: column; overflow: hidden; }
.editor-area { flex: 1; min-height: 230px; display: flex; flex-direction: column; }
.editor-tabs { display: flex; min-height: 40px; border-bottom: 1px solid var(--border); background: var(--rail-bg); overflow-x: auto; }
.editor-tab { display: flex; align-items: stretch; min-width: 0; border-right: 1px solid var(--border); color: var(--muted); border-top: 2px solid transparent; }
.editor-tab.active { background: var(--editor-bg); color: var(--text); border-top-color: var(--accent); }
.editor-tab-main { display: flex; align-items: center; min-width: 0; padding: 0 5px 0 14px; color: inherit; font-size: 11px; white-space: nowrap; }
.editor-tab-main:hover { background: transparent; }
.editor-tab-main > span:last-child { max-width: 150px; overflow: hidden; text-overflow: ellipsis; }
.editor-tab .file-icon { margin-right: 9px; }
.editor-tab-close { align-self: center; display: grid; place-items: center; width: 24px; height: 24px; margin: 0 7px 0 1px; border-radius: 5px; color: var(--subtle); font-size: 16px; line-height: 1; opacity: 0; }
.editor-tab:hover .editor-tab-close, .editor-tab.active .editor-tab-close, .editor-tab-close:focus-visible { opacity: 1; }
.editor-tab-close:hover { color: var(--text); background: var(--selected); }
.editor-toolbar { display: flex; justify-content: space-between; align-items: center; padding: 10px 20px; gap: 10px; border-bottom: 1px solid var(--border-soft); min-height: 52px; }
#breadcrumb { font-size: 10px; color: var(--muted); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.editor-toolbar > div { display: flex; align-items: center; gap: 9px; }
.editor-actions { min-width: 0; }
.language { font-size: 9px; color: var(--muted); }
.primary { background: var(--accent); color: var(--on-accent); border-radius: 5px; padding: 8px 13px; font-size: 11px; font-weight: 600; white-space: nowrap; }
.primary:hover { background: var(--accent-hover); }
.document-view-toggle { display: flex; align-items: center; padding: 2px; border: 1px solid var(--border); border-radius: 6px; background: var(--panel-inset); }
.document-view-toggle button { padding: 5px 8px; border-radius: 4px; color: var(--muted); font-size: 10px; white-space: nowrap; }
.document-view-toggle button.selected { color: var(--text); background: var(--panel-raised); box-shadow: 0 1px 3px var(--overlay-shadow); }
.editor-stage { display: flex; flex: 1; min-height: 0; overflow: hidden; background: var(--editor-bg); }
.text-editor-pane { display: flex; flex: 1 1 100%; min-width: 0; min-height: 0; overflow: hidden; padding: 14px 0 5px; background: var(--editor-bg); }
.editor-stage.markdown-split .text-editor-pane, .editor-stage.markdown-split .markdown-preview { flex: 1 1 50%; min-width: 0; }
.editor-stage.markdown-split .markdown-preview { border-left: 1px solid var(--border); }
.line-numbers { width: 52px; flex-shrink: 0; text-align: right; padding: 0 14px 0 0; overflow: hidden; color: var(--line-number); font: 12px/23px Consolas, monospace; white-space: pre; user-select: none; }
#editor { flex: 1; min-width: 0; resize: none; background: transparent; color: var(--text-secondary); border: 0; padding: 0 20px 0 8px; tab-size: 4; font: 12px/23px Consolas, "Microsoft YaHei", monospace; outline: none; overflow: auto; }
#editor:focus-visible { outline: none; box-shadow: inset 2px 0 var(--focus-soft); }
.markdown-preview { flex: 1 1 100%; min-width: 0; overflow: auto; padding: 30px clamp(24px, 5vw, 72px) 70px; color: var(--text-secondary); font: 14px/1.85 "Segoe UI", "Microsoft YaHei", sans-serif; background: var(--panel-raised); }
.markdown-preview > :first-child { margin-top: 0; }
.markdown-preview h1, .markdown-preview h2, .markdown-preview h3, .markdown-preview h4 { color: var(--text); line-height: 1.35; margin: 1.7em 0 0.65em; }
.markdown-preview h1 { padding-bottom: 12px; border-bottom: 1px solid var(--border); font-size: 28px; }
.markdown-preview h2 { font-size: 21px; }
.markdown-preview h3 { font-size: 17px; }
.markdown-preview p { margin: 0 0 1.15em; }
.markdown-preview code { border: 1px solid var(--border-soft); border-radius: 4px; padding: 0.1em 0.35em; background: var(--panel-inset); font: 0.92em Consolas, monospace; }
.markdown-preview pre { overflow: auto; margin: 1.4em 0; padding: 17px; border: 1px solid var(--border); border-radius: 7px; background: var(--panel-inset); }
.markdown-preview pre code { border: 0; padding: 0; background: transparent; }
.markdown-preview blockquote { margin: 1.4em 0; padding: 3px 16px; border-left: 3px solid var(--border-strong); color: var(--muted); }
.markdown-preview li { margin: 0.35em 0; }
.markdown-preview hr { margin: 2em 0; border: 0; border-top: 1px solid var(--border); }
.markdown-preview a { text-decoration: underline; text-underline-offset: 3px; }
.markdown-table-wrap { max-width: 100%; overflow-x: auto; margin: 1.5em 0; }
.markdown-preview table { width: 100%; border-collapse: collapse; font-size: 12px; }
.markdown-preview th, .markdown-preview td { padding: 8px 10px; border: 1px solid var(--border); text-align: left; }
.markdown-preview th { color: var(--text); background: var(--panel-inset); }
.math-block { margin: 1.5em 0; padding: 16px; overflow-x: auto; border: 1px solid var(--border); border-radius: 7px; text-align: center; white-space: pre-wrap; font: 15px/1.8 "Cambria Math", serif; background: var(--panel-inset); }
.markdown-empty { color: var(--muted); }

/* CSV and PDF use focused document workspaces inside the main editor stage. */
.csv-editor { flex: 1; min-width: 0; min-height: 0; padding: 12px; overflow: hidden; background: var(--panel-inset); }
#csv-grid { height: 100%; border: 1px solid var(--border); border-radius: 7px; overflow: hidden; background: var(--panel-raised); }
.csv-toolbar { display: flex; align-items: center; gap: 4px; }
.csv-toolbar .quiet { padding: 5px 7px; white-space: nowrap; }
.csv-unavailable { display: grid; place-items: center; align-content: center; height: 100%; gap: 7px; color: var(--muted); }
.csv-unavailable strong { color: var(--text); }

/* Tabulator is recolored to match Yunti instead of shipping a second visual language. */
.tabulator { border: 0; background: var(--panel-raised); color: var(--text-secondary); font-size: 11px; }
.tabulator .tabulator-header { border-bottom: 1px solid var(--border-strong); background: var(--panel); color: var(--text); }
.tabulator .tabulator-header .tabulator-col { border-right: 1px solid var(--border); background: var(--panel); }
.tabulator .tabulator-header .tabulator-col.tabulator-sortable:hover { background: var(--hover); }
.tabulator .tabulator-header .tabulator-col .tabulator-col-content { padding: 9px 8px; }
.tabulator .tabulator-header-filter input { border: 1px solid var(--border); border-radius: 4px; padding: 5px 6px; color: var(--text); background: var(--panel-raised); }
.tabulator-row { min-height: 34px; border-bottom: 1px solid var(--border-soft); background: var(--panel-raised); color: var(--text-secondary); }
.tabulator-row:nth-child(even) { background: var(--panel); }
.tabulator-row:hover, .tabulator-row.tabulator-selected, .tabulator-row.tabulator-selected:hover { background: var(--selected); }
.tabulator-row .tabulator-cell { border-right: 1px solid var(--border-soft); padding: 8px; }
.tabulator-row .tabulator-cell.tabulator-editing { border: 1px solid var(--focus); background: var(--panel-raised); color: var(--text); }
.tabulator .tabulator-footer { border-top: 1px solid var(--border); background: var(--panel); }
.tabulator .tabulator-tableholder .tabulator-placeholder { color: var(--muted); }

.pdf-editor { display: flex; flex-direction: column; flex: 1; min-width: 0; min-height: 0; overflow: hidden; background: var(--panel-inset); }
.pdf-toolbar { display: flex; align-items: center; gap: 4px; min-height: 45px; padding: 6px 10px; border-bottom: 1px solid var(--border); background: var(--panel); overflow-x: auto; }
.pdf-toolbar button { flex: 0 0 auto; padding: 6px 8px; border: 1px solid transparent; border-radius: 5px; color: var(--text-secondary); font-size: 10px; white-space: nowrap; }
.pdf-toolbar button:hover { border-color: var(--border); }
.pdf-toolbar button.selected { border-color: var(--border-strong); background: var(--selected); color: var(--text); }
.pdf-toolbar button.primary { margin-left: 5px; color: var(--on-accent); }
.pdf-toolbar-spacer { flex: 1 1 auto; }
.pdf-toolbar-separator { flex: 0 0 auto; width: 1px; height: 20px; margin: 0 5px; background: var(--border); }
#pdf-page-label, #pdf-zoom-label { min-width: 42px; color: var(--muted); text-align: center; font: 9px Consolas, monospace; }
.pdf-workspace { display: grid; grid-template-columns: 112px minmax(0, 1fr); flex: 1; min-height: 0; }
.pdf-pages { min-height: 0; overflow-y: auto; padding: 10px; border-right: 1px solid var(--border); background: var(--panel); }
.pdf-pages button { display: flex; flex-direction: column; align-items: center; width: 100%; margin-bottom: 9px; padding: 6px; border: 1px solid transparent; border-radius: 5px; color: var(--muted); font-size: 9px; }
.pdf-pages button.active { border-color: var(--border-strong); background: var(--selected); color: var(--text); }
.pdf-pages canvas { display: block; max-width: 76px; max-height: 108px; margin-bottom: 5px; background: #ffffff; box-shadow: 0 2px 7px rgba(0,0,0,.13); }
.pdf-viewer { min-width: 0; min-height: 0; overflow: auto; padding: 28px; background-color: var(--panel-inset); background-image: radial-gradient(var(--border) .7px, transparent .7px); background-size: 13px 13px; }
.pdf-canvas-wrap { position: relative; margin: 0 auto; background: #ffffff; box-shadow: 0 10px 35px rgba(0,0,0,.2); }
.pdf-canvas-wrap canvas { position: absolute; inset: 0; display: block; }
.pdf-annotations { position: absolute; inset: 0; overflow: visible; touch-action: none; }
.pdf-annotations[data-tool="text"] { cursor: text; }
.pdf-annotations[data-tool="highlight"], .pdf-annotations[data-tool="draw"] { cursor: crosshair; }
.pdf-annotation { pointer-events: all; }
.pdf-annotation.highlight { fill: rgba(255, 221, 64, .34); stroke: rgba(156, 118, 0, .34); stroke-width: 1; }
.pdf-annotation.drawing { fill: none; stroke: #d84343; stroke-width: 3; stroke-linecap: round; stroke-linejoin: round; }
.pdf-annotation.text rect { fill: rgba(255,255,255,.92); stroke: rgba(20,20,20,.25); }
.pdf-annotation.text text { fill: #171717; font: 500 14px "Microsoft YaHei", sans-serif; }
.pdf-annotation.selected { filter: drop-shadow(0 0 2px #111111); stroke: #111111; stroke-width: 2; }
.pdf-annotation.draft { opacity: .72; pointer-events: none; }
.pdf-empty { display: flex; flex-direction: column; align-items: center; justify-content: center; width: min(560px, 100%); min-height: 100%; margin: auto; padding: 32px; color: var(--muted); text-align: center; }
.pdf-empty-mark { display: grid; place-items: center; width: 62px; height: 76px; margin-bottom: 18px; border: 1px solid var(--border-strong); border-radius: 5px 14px 5px 5px; color: var(--text); background: var(--panel-raised); font: 600 14px/1 Consolas, monospace; box-shadow: 0 8px 20px var(--overlay-shadow); }
.pdf-empty h2 { margin: 0 0 8px; color: var(--text); font-size: 17px; font-weight: 600; }
.pdf-empty > p { max-width: 430px; margin: 0 0 20px; font-size: 11px; line-height: 1.7; }
.pdf-legacy-card { width: 100%; max-width: 430px; margin: 0 0 20px; padding: 14px; border: 1px solid var(--border); border-radius: 7px; text-align: left; background: var(--panel-raised); }
.pdf-legacy-card strong, .pdf-legacy-card span { display: block; margin-bottom: 6px; }
.pdf-legacy-card span, .pdf-legacy-card p { color: var(--muted); font-size: 9px; line-height: 1.6; white-space: pre-wrap; }
.editor-footer { display: flex; gap: 17px; color: var(--muted); font-size: 9px; padding: 7px 17px; border-top: 1px solid var(--border-soft); }
#save-state { margin-right: auto; }
.output-area { height: 191px; flex-shrink: 0; background: var(--panel-inset); border-top: 1px solid var(--border); }
.output-heading { display: flex; align-items: center; justify-content: space-between; padding: 0 17px; border-bottom: 1px solid var(--border); }
.output-tabs { display: flex; gap: 20px; }
.output-tabs button { font-size: 11px; color: var(--muted); padding: 12px 0; border-bottom: 2px solid transparent; }
.output-tabs button.selected { color: var(--text); border-color: var(--accent); }
.output-tabs span { font-size: 9px; background: var(--badge-bg); padding: 1px 5px; border-radius: 3px; margin-left: 4px; }
.demo-badge { font-size: 9px; color: var(--muted); }
.output-content { height: 140px; overflow: auto; padding: 14px 20px; color: var(--text-secondary); font: 11px/21px Consolas, "Microsoft YaHei", monospace; }
.output-content pre { font: inherit; margin: 0; white-space: pre-wrap; }
.output-empty { display: flex; gap: 12px; align-items: flex-start; color: var(--muted); }
.output-empty > span { font-size: 24px; color: var(--subtle); }
.output-empty strong { display: block; color: var(--text-secondary); font: 12px "Microsoft YaHei", sans-serif; margin-bottom: 7px; }
.output-empty p { margin: 0; font-size: 10px; }
.snapshot-link { display: block; padding: 3px 0; }

/* Timeline, AI and meeting panels. */
.right-panel { position: relative; display: flex; flex-direction: column; min-height: 0; border-left: 1px solid var(--border); background: var(--panel); }
.panel-tabs { display: flex; padding: 0 15px; border-bottom: 1px solid var(--border); gap: 19px; flex-shrink: 0; }
.panel-tabs button { padding: 15px 8px; color: var(--muted); font-size: 12px; border-bottom: 2px solid transparent; }
.panel-tabs button.selected { color: var(--accent); border-color: var(--accent); }
#panel-content { flex: 1; min-height: 0; overflow: hidden; }
.panel-scroll { height: 100%; min-height: 0; overflow: auto; }
.timeline-view { display: grid; grid-template-columns: minmax(0, 1fr) 32px; height: 100%; min-height: 0; }
.timeline-scroll { min-width: 0; scrollbar-width: none; }
.timeline-scroll::-webkit-scrollbar { display: none; }
.shiji-ruler { position: relative; min-height: 0; overflow: hidden; border-left: 1px solid var(--border-soft); background: var(--panel-inset); cursor: pointer; user-select: none; touch-action: none; }
.shiji-events { position: absolute; inset: 0; pointer-events: none; }
.shiji-mark { position: absolute; left: 5px; display: grid; place-items: center; width: 22px; height: 14px; margin-top: -7px; padding: 0; border-radius: 4px; pointer-events: auto; }
.shiji-mark span { display: block; width: 10px; height: 3px; border-radius: 3px; background: var(--text-secondary); opacity: .7; transition: width 140ms ease, opacity 140ms ease; }
button.shiji-mark:hover { background: var(--hover); }
.shiji-mark:hover span, .shiji-mark:focus-visible span, .shiji-mark.active span { width: 17px; opacity: 1; background: var(--text); }
.shiji-thumb { position: absolute; z-index: 2; top: 0; right: -10px; width: 25px; min-height: 72px; padding: 0; border: 1px solid var(--border-strong); border-right: 0; border-radius: 18px 0 0 18px; background: color-mix(in srgb, var(--panel-raised) 88%, transparent); box-shadow: -5px 0 18px var(--overlay-shadow), inset 1px 0 var(--border-soft); cursor: grab; transition: transform 90ms ease, height 90ms ease, background 120ms ease; }
.shiji-thumb:hover, .shiji-thumb:focus-visible { background: var(--panel-raised); }
.shiji-thumb.dragging { cursor: grabbing; transition: none; }
.panel-intro { padding: 24px 22px 18px; }
.panel-eyebrow { font-size: 9px; color: var(--muted); letter-spacing: 2px; }
.panel-intro h2 { font-size: 22px; font-weight: 500; letter-spacing: 2px; margin: 9px 0; }
.panel-intro p { color: var(--muted); font-size: 11px; line-height: 1.8; margin: 0; }
.timeline-tools { display: flex; padding: 0 20px 17px; gap: 7px; }
.filter { background: var(--panel-raised); color: var(--text-secondary); border: 1px solid var(--border); border-radius: 4px; padding: 6px 7px; min-width: 0; font-size: 11px; }
.timeline-tools select { flex: 1; }
.note-button { color: var(--text-secondary); border: 1px solid var(--border-strong); border-radius: 4px; font-size: 11px; padding: 6px 9px; }
.timeline-date { font-size: 10px; color: var(--muted); padding: 0 24px 17px; }
.timeline { margin: 0 20px 20px 28px; border-left: 1px solid var(--border-strong); }
.event { position: relative; padding: 0 0 23px 20px; }
.event-dot { position: absolute; left: -5px; top: 5px; width: 9px; height: 9px; border-radius: 50%; background: var(--panel); border: 2px solid var(--text-secondary); }
.event-dot.decision { border-color: var(--accent); }
.event-dot.version { border-color: var(--subtle); }
.event-meta { font-size: 9px; color: var(--muted); display: flex; gap: 8px; align-items: center; margin-bottom: 8px; }
.event-kind { padding: 2px 5px; color: var(--text-secondary); background: var(--badge-bg); border-radius: 3px; }
.event h3 { font-size: 12px; font-weight: 500; margin: 0 0 8px; color: var(--text); }
.event p { color: var(--muted); font-size: 11px; line-height: 1.8; margin: 0 0 9px; overflow-wrap: anywhere; white-space: pre-wrap; }
.event-links { display: flex; gap: 10px; flex-wrap: wrap; }
.event-links a, .event-links button { font-size: 10px; padding: 0; color: var(--text-secondary); text-decoration: underline; text-decoration-color: var(--border-strong); text-underline-offset: 3px; }
.event-links a:hover, .event-links button:hover { color: var(--text); text-decoration-color: currentColor; }
.event.highlight { background: var(--selected); border-radius: 5px; }
.timeline-empty { padding: 5px 23px 25px; color: var(--muted); font-size: 11px; line-height: 1.9; }
.guide-card { margin: 0 20px 22px; border: 1px solid var(--border); border-radius: 7px; background: var(--panel-raised); padding: 17px; }
.guide-card strong { font-size: 12px; font-weight: 500; color: var(--text-secondary); }
.guide-card p { font-size: 11px; color: var(--muted); line-height: 1.9; margin: 10px 0 0; }
.panel-footer { border-top: 1px solid var(--border); padding: 13px; font-size: 9px; color: var(--subtle); text-align: center; }
.panel-footer span { color: var(--text-secondary); margin-right: 7px; }
.connection { margin: 0 22px 18px; padding: 10px; border: 1px solid var(--border-strong); border-radius: 5px; color: var(--muted); font-size: 11px; line-height: 1.8; }
.panel-form { padding: 0 22px 20px; }
.panel-form label { display: block; color: var(--text-secondary); font-size: 11px; margin: 15px 0 8px; }
.panel-form select { width: 100%; }
.panel-form textarea { width: 100%; background: var(--panel-inset); border: 1px solid var(--border); border-radius: 5px; color: var(--text-secondary); padding: 12px; min-height: 130px; resize: vertical; font-size: 12px; line-height: 1.8; }
.panel-form small { display: block; line-height: 1.8; color: var(--muted); font-size: 10px; margin: 10px 0; }
.panel-form button { width: 100%; margin-top: 8px; }
.room-preview { margin: 0 22px 20px; min-height: 145px; border: 1px solid var(--border); background: var(--panel-inset); border-radius: 7px; display: grid; place-content: center; text-align: center; gap: 12px; color: var(--muted); }
.room-preview .avatar { margin: auto; width: 43px; height: 43px; font-size: 15px; }
.room-preview small { font-size: 10px; }

/* Status, dialogs and notifications share the theme palette. */
.statusbar { height: 28px; display: flex; gap: 21px; align-items: center; padding: 0 17px; background: var(--status-bg); border-top: 1px solid var(--border); color: var(--muted); font-size: 9px; }
.statusbar i { width: 5px; height: 5px; margin-right: 6px; }
.status-right { margin-left: auto; }
.status-right span { margin-left: 20px; color: var(--subtle); }
dialog { background: var(--panel-raised); border: 1px solid var(--border-strong); border-radius: 10px; color: var(--text); padding: 24px; width: min(660px, 90vw); max-height: 85dvh; box-shadow: 0 20px 100px var(--dialog-shadow); }
dialog::backdrop { background: var(--backdrop); backdrop-filter: blur(3px); }
.dialog-top { display: flex; justify-content: space-between; align-items: center; margin-bottom: 18px; }
.dialog-top h2 { margin: 0; font-size: 17px; font-weight: 500; }
#dialog-body { font-size: 12px; line-height: 1.9; color: var(--text-secondary); }
#dialog-body input, #dialog-body textarea { display: block; width: 100%; background: var(--panel-inset); border: 1px solid var(--border-strong); border-radius: 5px; padding: 10px; color: var(--text); margin: 9px 0 16px; }
#dialog-body textarea { min-height: 120px; resize: vertical; }
#dialog-body pre { white-space: pre-wrap; overflow-wrap: anywhere; background: var(--panel-inset); padding: 17px; max-height: 45vh; overflow: auto; font: 12px/1.8 Consolas, monospace; }
.dialog-actions { display: flex; gap: 10px; justify-content: flex-end; margin-top: 18px; }
.history-warning { color: var(--text-secondary); }
#toast { position: fixed; bottom: 45px; left: 50%; transform: translateX(-50%); padding: 11px 20px; border: 1px solid var(--toast-border); background: var(--toast-bg); color: var(--toast-text); box-shadow: 0 5px 25px var(--overlay-shadow); border-radius: 6px; font-size: 12px; opacity: 0; pointer-events: none; transition: opacity 0.2s; z-index: 10; }
#toast.visible { opacity: 1; }
.empty { padding: 12px; color: var(--muted); font-size: 11px; }
::-webkit-scrollbar { width: 7px; height: 7px; }
::-webkit-scrollbar-thumb { background: var(--scrollbar); border-radius: 5px; }
::-webkit-scrollbar-thumb:hover { background: var(--scrollbar-hover); }

/* Keep the existing responsive workspace, including overlay panels. */
@media (min-width: 1600px) {
  .workspace { grid-template-columns: 60px 240px minmax(350px, 1fr) 380px; }
  .output-area { height: 220px; }
  .output-content { height: 168px; }
}
@media (max-width: 1180px) {
  .workspace { grid-template-columns: 49px 175px minmax(310px, 1fr) 290px; }
  .topbar { padding: 0 17px; gap: 12px; }
  .top-right { gap: 12px; }
  .brand-en, .presence { display: none; }
  .editor-toolbar { padding: 10px; }
  .language { display: none; }
  .panel-tabs { gap: 9px; }
  .timeline-tools { padding-left: 15px; padding-right: 15px; }
  .csv-toolbar { max-width: 300px; overflow-x: auto; }
  .pdf-workspace { grid-template-columns: 92px minmax(0, 1fr); }
  .pdf-viewer { padding: 20px; }
}
@media (max-width: 900px) {
  .workspace { grid-template-columns: 46px minmax(290px, 1fr) 285px; }
  .explorer { display: none; }
  .project-name { max-width: 180px; overflow: hidden; white-space: nowrap; text-overflow: ellipsis; }
  .workspace.show-files .explorer { display: flex; position: absolute; left: 46px; top: 66px; bottom: 28px; width: 220px; z-index: 3; box-shadow: 20px 0 40px var(--overlay-shadow); }
}
@media (max-width: 650px) {
  .workspace { grid-template-columns: 43px minmax(250px, 1fr); min-height: 600px; }
  .right-panel { display: none; }
  .workspace.show-panel .right-panel { display: flex; position: absolute; left: 43px; right: 0; top: 66px; bottom: 28px; z-index: 2; }
  .workspace.show-files .explorer { left: 43px; }
  .topbar { padding: 0 12px; }
  .top-divider, .project-name, .top-right .quiet, .prototype { display: none; }
  .top-right { gap: 8px; }
  .status-right { font-size: 0; }
  .status-right span { font-size: 9px; }
  .editor-toolbar { flex-wrap: wrap; }
  .editor-toolbar > div { margin-left: auto; }
  .editor-tabs { min-height: 38px; }
  .output-area { height: 175px; }
  .output-content { height: 125px; }
  .document-view-toggle button { padding: 5px 6px; font-size: 9px; }
  .markdown-split { flex-direction: column; }
  .editor-stage.markdown-split .markdown-preview { border-top: 1px solid var(--border); border-left: 0; }
  .pdf-workspace { grid-template-columns: 1fr; }
  .pdf-pages { display: none; }
  .pdf-viewer { padding: 14px; }
  .pdf-toolbar-spacer { display: none; }
  .pdf-toolbar { gap: 2px; }
}
@media (prefers-reduced-motion: reduce) {
  .explorer::before { display: none; }
  #file-particles { display: none; }
  .folder-chevron, .shiji-thumb, .shiji-mark span, #toast { transition: none; }
}
@media (hover: none), (pointer: coarse) {
  .explorer::before { display: none; }
  #file-particles { display: none; }
}