/* Obsidian 默认暗色主题的 token，改主题就改这一段 */
:root{
  --bg-primary:#1e1e1e;
  --bg-secondary:#161616;
  --bg-tertiary:#262626;
  --bg-hover:#2a2a2a;
  --border:#2e2e2e;
  --border-strong:#3a3a3a;
  --text:#dcddde;
  --text-muted:#9a9a9a;
  --text-faint:#6b6b6b;
  --accent:#7f6df2;
  --accent-hover:#a08cff;
  --error:#e5534b;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
          "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --math: "Latin Modern Math", "Cambria Math", "Times New Roman", Georgia, serif;
}

*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;display:flex;flex-direction:column;height:100vh;overflow:hidden;
  background:var(--bg-primary);color:var(--text);
  font:13px/1.5 var(--sans);
  -webkit-font-smoothing:antialiased;
}
::selection{background:rgba(127,109,242,.28)}
.grow{flex:1}

/* 浅色主题：只换 token，其余样式不动 */
body.light{
  --bg-primary:#ffffff;
  --bg-secondary:#f6f7f9;
  --bg-tertiary:#eceef2;
  --border:#e3e6eb;
  --border-strong:#ccd2db;
  --text:#1f2328;
  --text-muted:#5c6674;
  --text-faint:#8a94a3;
  --accent:#5b4bd6;
  --accent-hover:#4a3ac4;
}
body.light .table-panel{background:rgba(255,255,255,.97)}
body.light .toast{background:#eef0f4;border-color:#d4d9e0;color:#1f2328}
body.light .help{background:#fff;border-color:#d4d9e0}
body.light .row:hover,body.light .row:focus-within{background:var(--bg-secondary)}
body.light .stage-tools .ghost{background:rgba(255,255,255,.8)}

/* ------------------------------- 标题栏 ------------------------------- */
.titlebar{
  flex:0 0 40px;display:flex;align-items:flex-end;gap:6px;
  padding:0 10px 0 10px;background:var(--bg-secondary);
  border-bottom:1px solid var(--border);
}
.back-home{
  display:flex;align-items:center;gap:4px;height:30px;padding:0 9px;margin-bottom:4px;
  color:var(--text-faint);font-size:12px;text-decoration:none;border-radius:6px;
  transition:color .12s, background .12s;
}
.back-home:hover{color:var(--accent-hover);background:var(--bg-tertiary)}

.tab{
  height:32px;margin-bottom:-1px;padding:0 16px;
  display:flex;align-items:center;gap:8px;
  background:var(--bg-primary);
  border:1px solid var(--border);border-bottom-color:var(--bg-primary);
  border-radius:8px 8px 0 0;
  color:var(--text);font-size:13px;
}
.titlebar .ghost{margin-bottom:5px}

/* ------------------------------- 按钮 --------------------------------- */
button{font:inherit}
.ghost{
  height:28px;padding:0 10px;
  background:transparent;color:var(--text-muted);
  border:1px solid transparent;border-radius:6px;cursor:pointer;
  transition:color .12s, background .12s, border-color .12s;
}
.ghost:hover{color:var(--text);background:var(--bg-tertiary);border-color:var(--border)}
.ghost.tiny{height:24px;padding:0 8px;font-size:12px}
.ghost.on{
  color:var(--accent-hover);
  background:rgba(127,109,242,.12);
  border-color:rgba(127,109,242,.5);
}

/* ------------------------------- 工作区 ------------------------------- */
.workspace{flex:1;display:flex;min-height:0}

.panel{
  flex:0 0 390px;display:flex;flex-direction:column;min-height:0;
  background:var(--bg-primary);border-right:1px solid var(--border);
}
.panel-head{
  display:flex;align-items:center;gap:6px;
  padding:8px 12px;border-bottom:1px solid var(--border);
}
.panel-title{font-size:12px;letter-spacing:.08em;text-transform:uppercase;color:var(--text-faint)}

.examples{
  display:flex;gap:4px;flex-wrap:wrap;padding:8px 12px 0;
}
.examples button{
  font:11px/1 var(--sans);padding:4px 8px;border-radius:4px;cursor:pointer;
  background:transparent;border:1px solid var(--border);color:var(--text-muted);
}
.examples button:hover{color:var(--accent-hover);border-color:rgba(127,109,242,.45)}

.rows{flex:1;overflow-y:auto;padding:6px 0 10px}
.row{
  display:grid;grid-template-columns:16px 1fr 16px 24px;gap:8px;
  padding:7px 12px 7px 10px;border-left:2px solid transparent;
}
.row:hover{background:var(--bg-secondary)}
.row:focus-within{background:var(--bg-secondary);border-left-color:var(--accent)}
.row.muted{opacity:.42}

.swatch{
  width:12px;height:12px;margin-top:7px;padding:0;
  border-radius:3px;border:1px solid rgba(255,255,255,.12);
  background:var(--c);cursor:pointer;
}

.row-main{min-width:0}
.expr{
  width:100%;padding:2px 0;border:0;outline:0;background:transparent;
  color:var(--text);font:15px/1.5 var(--mono);letter-spacing:.2px;
}
.expr::placeholder{color:var(--text-faint)}

.preview{
  min-height:20px;margin-top:2px;
  color:var(--text-muted);font:15px/1.5 var(--math);
  white-space:nowrap;overflow-x:auto;overflow-y:hidden;
  scrollbar-width:none;
}
.preview::-webkit-scrollbar{display:none}

/* 预览里的「排版后」数学 */
.pv-i{font-style:italic}
.pv-n,.pv-c{font-style:normal}
.pv-op{color:#8d9aab;margin:0 3px}
.pv-sup{font-size:.72em;font-style:normal}
.pv-fn{font-style:normal;color:var(--text-muted)}
.pv-frac{
  display:inline-flex;flex-direction:column;vertical-align:middle;
  text-align:center;font-size:.9em;line-height:1.2;margin:0 .15em;
  position:relative;top:-.08em;
}
.pv-num{border-bottom:1px solid currentColor;padding:0 .2em}
.pv-den{padding:0 .2em}
.pv-sqrt{display:inline-flex;align-items:flex-start}
.pv-rad{border-top:1px solid currentColor;padding:0 .18em;margin-top:.12em}

.row-note{
  margin-left:10px;font-family:var(--sans);font-size:11.5px;
  color:#c9a227;opacity:.85;
}
.row-error{display:none;color:var(--error);font:12px/1.5 var(--mono);margin-top:2px}
.row.has-error .row-error{display:block}
.row.has-error .preview{display:none}

.row-modes{display:flex;gap:4px;margin-top:5px}
.row-modes:empty{display:none}
.mode-chip{
  font:11px/1 var(--sans);padding:3px 8px;border-radius:4px;cursor:pointer;
  background:transparent;border:1px solid var(--border);color:var(--text-muted);
}
.mode-chip:hover{color:var(--accent-hover);border-color:rgba(127,109,242,.45)}
.mode-chip.on{
  color:var(--accent-hover);border-color:rgba(127,109,242,.55);
  background:rgba(127,109,242,.12);
}
body.mode3d .row:not(.is3d){opacity:.4}
body.mode3d .row:not(.is3d) .row-modes{pointer-events:none}

.row-fit{
  width:20px;height:20px;margin-top:5px;padding:0;line-height:1;
  background:transparent;border:0;border-radius:4px;
  color:var(--text-faint);cursor:pointer;font-size:12px;
}
.row-fit:hover{color:var(--accent-hover);background:rgba(127,109,242,.1)}

.badge{
  display:none;margin-top:4px;padding:1px 6px;border-radius:3px;
  font-size:10.5px;letter-spacing:.04em;
  color:#c9a227;background:rgba(201,162,39,.12);border:1px solid rgba(201,162,39,.35);
}
.badge.on{display:inline-block}

.row-del{
  width:22px;height:22px;margin-top:4px;padding:0;line-height:1;
  background:transparent;border:0;border-radius:4px;
  color:var(--text-faint);cursor:pointer;font-size:16px;
}
.row-del:hover{color:var(--error);background:rgba(229,83,75,.1)}

.add-row{
  margin:0 12px 8px;height:34px;
  background:transparent;color:var(--text-muted);
  border:1px dashed var(--border-strong);border-radius:6px;cursor:pointer;
  font-size:12.5px;
}
.add-row:hover{color:var(--accent-hover);border-color:rgba(127,109,242,.5)}

/* ------------------------------ 数学键盘 ------------------------------ */
.palette{
  display:grid;grid-template-columns:repeat(10,1fr);gap:4px;
  padding:0 12px 8px;
}
.palette.hidden{display:none}
.key{
  height:30px;padding:0;
  background:var(--bg-tertiary);border:1px solid var(--border);
  border-radius:5px;color:var(--text-muted);cursor:pointer;
  font:14px/1 var(--math);
}
.key:hover{color:var(--accent-hover);border-color:rgba(127,109,242,.5)}

/* -------------------------------- 参数 -------------------------------- */
.params{padding:0 12px 12px;max-height:34vh;overflow-y:auto}
.params.empty{display:none}
.params-title{font-size:11px;letter-spacing:.08em;text-transform:uppercase;color:var(--text-faint);margin:4px 0 6px}
.param{display:grid;grid-template-columns:18px 1fr 56px 20px 20px;align-items:center;gap:6px;margin-bottom:6px}
.param-name{font:italic 15px/1 var(--math);color:var(--text)}
.param input[type=range]{
  appearance:none;-webkit-appearance:none;height:3px;border-radius:2px;
  background:var(--border-strong);outline:0;
}
.param input[type=range]::-webkit-slider-thumb{
  -webkit-appearance:none;width:12px;height:12px;border-radius:50%;
  background:var(--accent);border:0;cursor:pointer;
}
.param-num{
  width:100%;height:26px;padding:0 6px;
  background:var(--bg-secondary);border:1px solid var(--border);
  border-radius:4px;color:var(--text);font:12px var(--mono);outline:0;
}
.param-num:focus{border-color:var(--accent)}
.param-range{
  width:20px;height:22px;padding:0;line-height:1;border-radius:4px;cursor:pointer;
  background:transparent;border:1px solid transparent;color:var(--text-faint);font-size:11px;
}
.param-range:hover{color:var(--accent-hover);border-color:var(--border);background:var(--bg-tertiary)}
.param-play{
  width:20px;height:22px;padding:0;line-height:1;border-radius:4px;cursor:pointer;
  background:transparent;border:1px solid transparent;color:var(--text-faint);font-size:10px;
}
.param-play:hover{color:var(--accent-hover);border-color:var(--border);background:var(--bg-tertiary)}

/* -------------------------------- 画布 -------------------------------- */
.stage{position:relative;flex:1;min-width:0;background:var(--bg-primary);overflow:hidden}
.stage canvas{position:absolute;inset:0;width:100%;height:100%;display:block}
#ov{pointer-events:none}
#gl{cursor:grab;touch-action:none}
#gl:focus-visible{outline:2px solid var(--accent);outline-offset:-2px}
.expr:focus-visible{outline:2px solid rgba(127,109,242,.6);outline-offset:2px;border-radius:3px}
.param input:focus-visible{outline:2px solid rgba(127,109,242,.6);outline-offset:2px}
.stage.dragging #gl{cursor:grabbing}

.stage-tools{position:absolute;right:12px;top:12px;display:flex;gap:4px;align-items:flex-start}
.menu-wrap{position:relative}
.menu{
  display:none;position:absolute;right:0;top:30px;z-index:5;
  min-width:170px;padding:4px;border-radius:6px;
  background:var(--bg-tertiary);border:1px solid var(--border-strong);
  box-shadow:0 12px 30px -12px #000;
}
.menu.open{display:block}
.menu button{
  display:block;width:100%;text-align:left;padding:7px 10px;border:0;border-radius:4px;
  background:transparent;color:var(--text-muted);font-size:12px;cursor:pointer;
}
.menu button:hover{background:rgba(127,109,242,.12);color:var(--accent-hover)}
.stage-tools .ghost{
  background:rgba(22,22,22,.72);border:1px solid var(--border);
  backdrop-filter:blur(6px);
}


.table-panel{
  position:absolute;right:12px;bottom:12px;width:min(560px,calc(100% - 24px));
  max-height:min(56vh,460px);overflow:auto;z-index:4;
  padding:10px 12px 12px;border-radius:8px;
  background:rgba(22,22,22,.96);border:1px solid var(--border-strong);
  box-shadow:0 18px 50px -20px #000;
  font-size:12px;
}
.table-panel.hidden{display:none}
.tp-head{display:flex;align-items:center;gap:8px;margin:6px 0 6px}
.tp-head b{font-size:12px;color:var(--text);font-weight:600}
.tp-head .spacer{flex:1}
.tp-btn{
  font:11px/1 var(--sans);padding:4px 8px;border-radius:4px;cursor:pointer;
  background:var(--bg-tertiary);border:1px solid var(--border);color:var(--text-muted);
}
.tp-btn:hover{color:var(--accent-hover);border-color:rgba(127,109,242,.45)}
.tp-sub{margin:8px 0 4px;color:var(--text-muted);font-size:11.5px}
.tp-table{width:100%;border-collapse:collapse;font:11.5px/1.6 var(--mono)}
.tp-table th{
  text-align:right;color:var(--text-faint);font-weight:500;
  border-bottom:1px solid var(--border);padding:2px 6px;
}
.tp-table td{text-align:right;padding:2px 6px;color:var(--text);border-bottom:1px solid rgba(46,46,46,.5)}
.tp-empty{color:var(--text-faint);font-size:11.5px;margin:4px 0 10px}
.tp-in{
  width:100%;height:24px;padding:0 6px;border-radius:4px;
  background:var(--bg-secondary);border:1px solid var(--border);color:var(--text);
  font:11.5px/1 var(--mono);outline:0;text-align:right;
}
.tp-in:focus{border-color:var(--accent)}

/* ------------------------------- 状态栏 ------------------------------- */
.statusbar{
  flex:0 0 26px;display:flex;align-items:center;gap:0;
  padding:0 12px;background:var(--bg-secondary);
  border-top:1px solid var(--border);
  color:var(--text-faint);font-size:11.5px;
}
.statusbar .sep{opacity:.4;margin:0 8px}
.statusbar > div{padding-right:12px}
#note{color:#c9a227}
#readout{color:var(--text-muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:46vw}

/* -------------------------------- 帮助 -------------------------------- */
.help{
  width:min(640px,92vw);max-height:84vh;overflow:auto;
  padding:18px 20px 22px;border-radius:10px;
  background:var(--bg-primary);color:var(--text);
  border:1px solid var(--border-strong);
  box-shadow:0 30px 80px -30px #000;
}
.help::backdrop{background:rgba(0,0,0,.6)}
.win-dialog{width:min(360px,92vw)}
.win-grid{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin:10px 0}
.win-grid label{display:flex;flex-direction:column;gap:4px;font-size:11.5px;color:var(--text-muted)}
.win-grid input{
  height:30px;padding:0 8px;border-radius:5px;font:12px var(--mono);
  background:var(--bg-secondary);border:1px solid var(--border);color:var(--text);outline:0;
}
.win-grid input:focus{border-color:var(--accent)}
.win-foot{display:flex;justify-content:flex-end}
.help-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:10px}
.help-lead{color:var(--text-muted);margin:12px 0 8px}
.help-table{width:100%;border-collapse:collapse;font-size:12.5px}
.help-table th{text-align:left;color:var(--text-faint);font-weight:500;padding:5px 8px;border-bottom:1px solid var(--border)}
.help-table td{padding:5px 8px;border-bottom:1px solid var(--border);vertical-align:top}
.help-table td:first-child{color:var(--text-muted);white-space:nowrap}
.help code{
  font-family:var(--mono);font-size:12px;
  background:var(--bg-tertiary);padding:1px 5px;border-radius:4px;color:#cfc6ff;
}
.help-note{
  margin:10px 0 0;padding:8px 10px;border-radius:5px;
  background:var(--bg-secondary);border-left:2px solid var(--accent);
  color:var(--text-muted);font-size:12px;line-height:1.6;
}
.help-note code{font-size:11.5px}
.help-examples{display:flex;flex-wrap:wrap;gap:6px}
.help-examples button{
  padding:5px 10px;border-radius:5px;cursor:pointer;
  background:var(--bg-tertiary);border:1px solid var(--border);
  color:var(--text-muted);font-size:12px;
}
.help-examples button:hover{color:var(--accent-hover);border-color:rgba(127,109,242,.5)}

/* -------------------------------- 其他 -------------------------------- */
.toast{
  position:fixed;left:50%;bottom:44px;transform:translate(-50%,8px);
  padding:8px 14px;border-radius:6px;
  background:#232b36;border:1px solid #33404f;color:var(--text);
  font-size:12.5px;opacity:0;pointer-events:none;transition:.18s;
}
.toast.show{opacity:1;transform:translate(-50%,0)}

.fatal{padding:40px;color:var(--text-muted);font-size:14px}

/* ------------------------------- 窄屏 --------------------------------- */
@media (max-width: 560px){
  .titlebar{flex:0 0 auto;flex-wrap:wrap;height:auto;padding:6px 8px;gap:6px;align-items:center}
  .back-home{
  display:flex;align-items:center;gap:4px;height:30px;padding:0 9px;margin-bottom:4px;
  color:var(--text-faint);font-size:12px;text-decoration:none;border-radius:6px;
  transition:color .12s, background .12s;
}
.back-home:hover{color:var(--accent-hover);background:var(--bg-tertiary)}

.tab{height:28px;margin-bottom:0;padding:0 12px;font-size:12.5px;border-radius:7px}
  .titlebar .ghost{margin-bottom:0;height:26px;padding:0 8px;font-size:12px}
}

@media (max-width: 860px){
  .workspace{flex-direction:column}
  .panel{flex:0 0 auto;max-height:46vh;border-right:0;border-bottom:1px solid var(--border)}
  .stage{flex:1 1 auto;min-height:300px}
  .palette{grid-template-columns:repeat(8,1fr)}
}