:root {
  --bg: #17191d;
  --panel: #1f2329;
  --panel2: #262b33;
  --border: #2e3440;
  --text: #d7dbe0;
  --muted: #8a93a0;
  --accent: #3b82f6;
  --accent-dim: #1d3a5f;
  --hover: #2c333e;
  --warn: #f59e0b;
  --err: #ef4444;
  --ok: #22c55e;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html, body { height: 100%; overflow: hidden; }
body {
  font-family: "Segoe UI", system-ui, sans-serif;
  font-size: 13px;
  color: var(--text);
  background: var(--bg);
  user-select: none;
}
.hidden { display: none !important; }
#app { display: flex; flex-direction: column; height: 100vh; }

#menubar {
  display: flex; align-items: center; height: 30px;
  background: var(--panel); border-bottom: 1px solid var(--border);
  padding: 0 4px; position: relative; z-index: 50;
}
#menubar::before {
  content: "OPENCAD"; color: #9fc3ff; font-size: 10px; font-weight: 800;
  letter-spacing: 1.2px; padding: 0 12px 0 8px; margin-right: 4px;
  border-right: 1px solid var(--border);
}
.menu-root { position: relative; }
.menu-root > button {
  background: none; border: none; color: var(--text); font: inherit;
  padding: 5px 10px; cursor: default; border-radius: 3px; transition: background .12s ease, color .12s ease;
}
.menu-root.open > button, .menu-root > button:hover { background: var(--hover); }
.menu-drop {
  position: absolute; top: 100%; left: 0; min-width: 220px;
  background: var(--panel2); border: 1px solid var(--border);
  border-radius: 4px; padding: 4px; z-index: 100;
  box-shadow: 0 6px 24px rgba(0,0,0,.5);
}
.menu-item {
  display: flex; justify-content: space-between; gap: 24px;
  padding: 6px 10px; border-radius: 3px; cursor: default; white-space: nowrap;
}
.menu-item:hover:not(.disabled) { background: var(--accent); color: #fff; }
.menu-item.disabled { color: #5b6270; }
.menu-item .accel { color: var(--muted); font-size: 11px; }
.menu-item:hover:not(.disabled) .accel { color: #d7e5ff; }
.menu-sep { height: 1px; background: var(--border); margin: 4px 6px; }

#main { flex: 1; display: flex; min-height: 0; }
.panel { background: var(--panel); display: flex; flex-direction: column; min-width: 60px; }
#leftpanel { width: 250px; border-right: none; }
#rightpanel { width: 290px; }
.panel-head {
  padding: 7px 10px; font-weight: 600; font-size: 12px; letter-spacing: .4px;
  text-transform: uppercase; color: var(--muted);
  border-bottom: 1px solid var(--border); background: var(--panel);
}
#tree, #props { flex: 1; overflow-y: auto; padding: 4px 0; }
.splitter { width: 4px; cursor: col-resize; background: transparent; flex-shrink: 0; }
.splitter:hover { background: var(--accent-dim); }

#center { flex: 1; position: relative; min-width: 100px; background: #14171c; }
#gl { width: 100%; height: 100%; display: block; outline: none; touch-action: none; }
#workspace-empty {
  position: absolute; inset: 0; display: grid; place-items: center; z-index: 10;
  pointer-events: none;
  background: radial-gradient(ellipse at 50% 48%, rgba(20, 23, 28, .08), rgba(20, 23, 28, .48) 70%);
}
.welcome-content { width: min(440px, calc(100% - 36px)); pointer-events: auto; text-align: center; }
.welcome-mark {
  width: 76px; height: 76px; margin: 0 auto 22px; position: relative;
  border: 1px solid rgba(129, 164, 199, .38); transform: rotate(30deg) skewY(-10deg);
  background: linear-gradient(145deg, rgba(58, 111, 157, .22), rgba(30, 44, 58, .08));
  box-shadow: inset 0 0 0 8px rgba(129, 164, 199, .04), 0 12px 34px rgba(0, 0, 0, .16);
}
.welcome-mark::before, .welcome-mark::after {
  content: ""; position: absolute; background: rgba(129, 164, 199, .46);
}
.welcome-mark::before { width: 1px; height: 108px; left: 50%; top: -17px; transform: rotate(-30deg); }
.welcome-mark::after { height: 1px; width: 108px; top: 50%; left: -17px; transform: rotate(30deg); }
.welcome-eyebrow { color: #8ea5ba; font-size: 10px; font-weight: 700; letter-spacing: 1.5px; }
.welcome-eyebrow span { color: #4d718e; padding: 0 4px; }
.welcome-content h1 { color: #e7edf2; font-size: 27px; line-height: 1.2; font-weight: 600; margin-top: 9px; }
.welcome-copy { color: #97a2ad; margin-top: 8px; font-size: 13px; }
.welcome-planes { display: flex; justify-content: center; gap: 8px; margin-top: 26px; }
.welcome-planes button {
  width: 104px; height: 66px; display: flex; flex-direction: column; justify-content: center; gap: 3px;
  color: var(--text); background: rgba(31, 35, 41, .9); border: 1px solid #39424d;
  border-radius: 4px; cursor: pointer; transition: border-color .14s ease, background .14s ease, transform .14s ease;
}
.welcome-planes button:hover { background: #282f37; border-color: #75a2c8; transform: translateY(-2px); }
.welcome-planes button span { color: #b8d7ef; font-size: 13px; font-weight: 700; }
.welcome-planes button small { color: var(--muted); font: inherit; font-size: 11px; }
.welcome-3d { margin-top: 17px; color: #9fb8cb; background: none; border: 0; font: inherit; cursor: pointer; padding: 5px 8px; }
.welcome-3d:hover { color: #d8e9f5; }
.welcome-3d span { padding-left: 4px; }

#sketchexitbar {
  position: absolute; top: 8px; right: 12px; display: flex; gap: 6px; z-index: 20;
}
.pill {
  border: none; border-radius: 14px; padding: 5px 14px; font: inherit; font-weight: 600;
  cursor: pointer; color: #fff;
}
.pill.ok { background: #15803d; }
.pill.ok:hover { background: #16a34a; }
.pill.bad { background: #7f1d1d; padding: 5px 10px; }
.pill.bad:hover { background: #b91c1c; }

#diminputwrap {
  position: absolute; z-index: 30; display: flex; align-items: center; gap: 6px;
  background: var(--panel2); border: 1px solid var(--accent); border-radius: 4px;
  padding: 4px 8px; box-shadow: 0 4px 16px rgba(0,0,0,.5);
}
#dimlabel { color: var(--muted); font-size: 11px; }
#diminput {
  width: 90px; background: #12151a; border: 1px solid var(--border); color: #fff;
  font: inherit; padding: 3px 6px; border-radius: 3px; outline: none;
}
#diminput:focus { border-color: var(--accent); }

#viewhud {
  position: absolute; left: 12px; top: 8px; z-index: 15; pointer-events: none;
  font-size: 11px; color: var(--muted); text-shadow: 0 1px 2px #000;
}
#viewcube { pointer-events: auto; }

#agentpanel {
  position: fixed; top: 30px; right: 0; bottom: 60px; width: 380px;
  background: var(--panel); border-left: 1px solid var(--border);
  display: flex; flex-direction: column; z-index: 120;
  box-shadow: -8px 0 24px rgba(0,0,0,.35);
}
#agentpanel.hidden { display: none; }
.agent-head {
  display: flex; align-items: center; gap: 6px; padding: 8px 10px;
  border-bottom: 1px solid var(--border); background: var(--panel2);
}
.agent-title { font-weight: 600; font-size: 13px; margin-right: auto; }
.agent-head select {
  max-width: 140px; background: #12151a; color: var(--text);
  border: 1px solid var(--border); border-radius: 3px; font: inherit; font-size: 11px; padding: 2px 4px;
}
.agent-btn {
  background: var(--panel); border: 1px solid var(--border); color: var(--text);
  width: 26px; height: 24px; border-radius: 4px; cursor: pointer; font-size: 12px;
}
.agent-btn:hover { border-color: var(--accent); color: #fff; }
#agentmsgs { flex: 1; overflow-y: auto; padding: 10px; display: flex; flex-direction: column; gap: 10px; }
.msg { max-width: 95%; border-radius: 8px; padding: 8px 10px; font-size: 13px; line-height: 1.45; white-space: pre-wrap; word-wrap: break-word; }
.msg.user { align-self: flex-end; background: var(--accent-dim); border: 1px solid #2c4a77; }
.msg.assistant { align-self: stretch; background: var(--panel2); border: 1px solid var(--border); }
.msg-thinking { background: #1a1e25; border: 1px solid var(--border); border-radius: 6px; margin-bottom: 6px; overflow: hidden; }
.think-head { padding: 4px 8px; font-size: 11px; color: var(--muted); cursor: pointer; user-select: none; }
.think-body {
  padding: 4px 8px 6px; font-size: 11.5px; color: #9aa5b1; font-style: italic;
  max-height: 180px; overflow-y: auto; white-space: pre-wrap;
}
.msg-thinking.collapsed .think-body { display: none; }
.msg-thinking.collapsed .think-caret { transform: rotate(0deg); display: inline-block; }
.msg-thinking:not(.collapsed) .think-caret { display: inline-block; transform: rotate(90deg); }
.msg-tools { display: flex; flex-direction: column; gap: 4px; margin-top: 6px; }
.toolchip {
  display: flex; align-items: center; gap: 6px; flex-wrap: wrap;
  background: #12151a; border: 1px solid var(--border); border-radius: 5px;
  padding: 3px 8px; font-family: Consolas, monospace; font-size: 11px; cursor: default;
}
.toolchip.bad { border-color: var(--err); }
.toolname { color: #cdd6e0; cursor: pointer; }
.toolres.wait { color: var(--warn); }
.toolres.ok { color: var(--ok); }
.toolres.bad { color: var(--err); }
.toolresulttext {
  width: 100%; color: var(--muted); white-space: pre-wrap;
  border-top: 1px dashed var(--border); padding-top: 3px; margin-top: 2px;
}
.toolresulttext.collapsed { display: none; }
.agent-inputwrap {
  display: flex; gap: 6px; padding: 8px; border-top: 1px solid var(--border); background: var(--panel2);
}
#agentinput {
  flex: 1; background: #12151a; border: 1px solid var(--border); color: var(--text);
  font: inherit; font-size: 13px; padding: 6px 8px; border-radius: 6px; outline: none; resize: none;
}
#agentinput:focus { border-color: var(--accent); }
.agent-send {
  width: 38px; background: var(--accent); border: none; color: #fff;
  border-radius: 6px; cursor: pointer; font-size: 15px;
}
.agent-send:hover { background: #2563eb; }
.agent-send.stop { background: #b3261e; }

#toolbar {
  display: flex; flex-direction: column; min-height: 106px; flex-shrink: 0;
  background: var(--panel); border-top: 1px solid var(--border); padding: 0 8px 3px;
}
.command-header { display: flex; align-items: stretch; height: 34px; flex-shrink: 0; border-bottom: 1px solid var(--border); }
.quick-access { display: flex; align-items: center; gap: 2px; padding: 0 8px 0 0; border-right: 1px solid var(--border); }
.command-tabs { display: flex; align-items: stretch; gap: 3px; padding-left: 9px; }
.command-tab {
  min-width: 72px; padding: 0 12px; color: var(--muted); background: transparent; border: 0;
  border-bottom: 2px solid transparent; font: inherit; font-size: 12px; cursor: pointer;
}
.command-tab:hover { color: var(--text); background: rgba(255,255,255,.025); }
.command-tab.active { color: #d9e7f2; border-bottom-color: #71a9d4; }
.command-tab[hidden] { display: none; }
.command-body { min-height: 68px; overflow-x: auto; overflow-y: hidden; scrollbar-width: thin; scrollbar-color: #424b59 #1a1e24; }
.command-panel { display: flex; align-items: stretch; width: max-content; min-width: 100%; height: 68px; }
.command-panel[hidden], .ribbon-group[hidden] { display: none; }
.tb-group { display: flex; align-items: center; gap: 2px; padding: 0 7px 12px; }
.ribbon-group { position: relative; border-right: 1px solid var(--border); }
.ribbon-label { position: absolute; left: 7px; right: 7px; bottom: 1px; text-align: center; color: #737e8c; font-size: 9px; line-height: 10px; }
.tb-btn {
  width: 30px; height: 30px; display: inline-flex; align-items: center; justify-content: center;
  background: none; border: none; border-radius: 4px; color: var(--text); cursor: pointer;
}
.tb-btn:hover:not(:disabled) { background: var(--hover); }
.tb-btn.active { background: var(--accent); color: #fff; }
.tb-btn.active-locked { background: var(--accent-dim); color: #cfe2ff; }
.tb-btn:disabled { color: #4b525e; cursor: default; }
.tb-btn svg { width: 18px; height: 18px; }
.tb-command { width: 60px; height: 52px; flex-direction: column; gap: 4px; border-radius: 3px; }
.tb-command .tb-caption { max-width: 58px; overflow: hidden; color: #aeb7c1; font-size: 9px; line-height: 11px; text-align: center; white-space: normal; }
.tb-command:hover:not(:disabled) .tb-caption, .tb-command.active .tb-caption { color: #fff; }
.tb-label { font-size: 11px; color: var(--muted); padding: 0 2px; }

#statusbar {
  height: 24px; display: flex; justify-content: space-between; align-items: center;
  background: var(--panel); border-top: 1px solid var(--border);
  padding: 0 10px; font-size: 12px; color: var(--muted);
}
#statusright { display: flex; gap: 14px; }
#statusright .ok { color: var(--ok); }
#statusright .warn { color: var(--warn); }
#statusright .err { color: var(--err); }

button, input, select, textarea { accent-color: var(--accent); }
button:focus-visible, input:focus-visible, select:focus-visible, textarea:focus-visible {
  outline: 2px solid #76aaff; outline-offset: 2px;
}
.panel-head { background: linear-gradient(180deg, #252a32, var(--panel)); }
.tb-btn { transition: background .12s ease, color .12s ease, transform .12s ease; }
.tb-btn:hover:not(:disabled) { transform: translateY(-1px); }
.splitter { position: relative; }
.splitter::after {
  content: ""; position: absolute; inset: 0 1px; border-radius: 2px;
  background: transparent; transition: background .12s ease;
}
.splitter:hover::after { background: var(--accent); }
#tree, #props, #agentmsgs, .menu-drop, #ctxmenu, #modalbox {
  scrollbar-color: #424b59 #1a1e24; scrollbar-width: thin;
}
#tree::-webkit-scrollbar, #props::-webkit-scrollbar, #agentmsgs::-webkit-scrollbar {
  width: 8px;
}
#tree::-webkit-scrollbar-thumb, #props::-webkit-scrollbar-thumb, #agentmsgs::-webkit-scrollbar-thumb {
  background: #424b59; border: 2px solid #1a1e24; border-radius: 8px;
}
.tree-body-row:focus-visible, .tree-feat-row:focus-visible { outline: 2px solid #76aaff; outline-offset: -2px; }
.props-grid input:focus, .props-grid select:focus, #modalbox input:focus, #modalbox select:focus,
#modalbox textarea:focus, #agentinput:focus {
  border-color: var(--accent); box-shadow: 0 0 0 2px rgba(59,130,246,.18);
}
#statusbar { background: linear-gradient(90deg, #1d2229, #191c21); }

@media (max-width: 900px) {
  #leftpanel { width: 205px; }
  #rightpanel { width: 235px; }
  .menu-root > button { padding-inline: 7px; }
  .tb-group { padding-inline: 4px; }
}

@media (max-width: 680px) {
  #leftpanel { width: 170px; }
  #rightpanel { width: 205px; }
  #toolbar { padding-inline: 4px; }
  .tb-btn { width: 27px; height: 28px; }
  .tb-command { width: 55px; height: 52px; }
  .tb-command .tb-caption { max-width: 53px; font-size: 9px; }
  .tb-group { padding-inline: 3px; }
  .tb-label { display: none; }
  .command-tab { min-width: 62px; padding-inline: 8px; }
  #agentpanel { width: min(380px, 100vw); }
  .welcome-content h1 { font-size: 24px; }
  .welcome-planes button { width: min(104px, 29vw); }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; animation-duration: .01ms !important; transition-duration: .01ms !important; }
}

.tree-body-row, .tree-feat-row {
  display: flex; align-items: center; gap: 5px; padding: 3px 8px; cursor: default;
  border-left: 2px solid transparent;
}
.tree-feat-row { padding-left: 26px; }
.tree-row:hover { background: var(--hover); }
.tree-row.selected { background: var(--accent-dim); border-left-color: var(--accent); }
.tree-row.suppressed { opacity: .45; }
.tree-row input.rename {
  background: #12151a; border: 1px solid var(--accent); color: #fff; font: inherit; width: 120px;
}
.tree-caret { width: 14px; text-align: center; color: var(--muted); cursor: pointer; font-size: 9px; flex-shrink: 0; }
.tree-icon { width: 15px; height: 15px; flex-shrink: 0; color: var(--muted); display:inline-flex; }
.tree-icon svg { width: 15px; height: 15px; }
.tree-name { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.tree-eye { background: none; border: none; color: var(--muted); cursor: pointer; width: 20px; height: 20px; display: inline-flex; align-items: center; justify-content: center; border-radius: 3px; visibility: hidden; }
.tree-eye svg { width: 13px; height: 13px; }
.tree-row:hover .tree-eye, .tree-eye.on { visibility: visible; }
.tree-eye.off { color: var(--warn); }
.tree-eye:hover { background: var(--hover); }
.drop-above { border-top: 2px solid var(--accent) !important; }
.drop-below { border-bottom: 2px solid var(--accent) !important; }

.props-section { border-bottom: 1px solid var(--border); padding-bottom: 8px; margin-bottom: 8px; }
.props-title {
  padding: 8px 10px 4px; font-size: 11px; text-transform: uppercase; letter-spacing: .4px;
  color: var(--muted); font-weight: 600; display:flex; justify-content: space-between; align-items:center;
}
.props-grid { display: grid; grid-template-columns: 96px 1fr; row-gap: 5px; padding: 2px 10px; align-items: center; }
.props-grid label { color: var(--muted); font-size: 12px; }
.props-grid input[type=text], .props-grid input[type=number], .props-grid select {
  width: 100%; background: #12151a; border: 1px solid var(--border); color: var(--text);
  font: inherit; padding: 3px 6px; border-radius: 3px; outline: none;
}
.props-grid input:focus, .props-grid select:focus { border-color: var(--accent); }
.props-grid input[type=checkbox] { accent-color: var(--accent); }
.prop-check { display: flex; align-items: center; gap: 6px; }
.prop-actions { display: flex; gap: 6px; padding: 6px 10px; flex-wrap: wrap; }
.btn {
  background: var(--panel2); color: var(--text); border: 1px solid var(--border);
  border-radius: 4px; padding: 5px 12px; font: inherit; cursor: pointer;
}
.btn:hover:not(:disabled) { border-color: var(--accent); color: #fff; }
.btn.primary { background: var(--accent); border-color: var(--accent); color:#fff; }
.btn.primary:hover { background: #2563eb; }
.btn:disabled { opacity: .4; cursor: default; }
.constraint-row { display: flex; align-items: center; gap: 6px; padding: 3px 10px; font-size: 12px; }
.constraint-row:hover { background: var(--hover); }
.constraint-row .cname { flex: 1; }
.constraint-row .del { background:none;border:none;color:var(--err);cursor:pointer;font-size:13px; }
.constraint-row.conflict { color: var(--err); }
.constraint-list { max-height: 180px; overflow-y: auto; }
.hintbox { padding: 8px 10px; color: var(--muted); font-size: 12px; line-height: 1.5; }
.warnline { color: var(--err); padding: 2px 10px; font-size: 12px; }

#ctxmenu {
  position: fixed; z-index: 200; min-width: 170px;
  background: var(--panel2); border: 1px solid var(--border); border-radius: 4px;
  padding: 4px; box-shadow: 0 6px 24px rgba(0,0,0,.55);
}
#modalwrap {
  position: fixed; inset: 0; z-index: 300; background: rgba(0,0,0,.45);
  display: flex; align-items: center; justify-content: center;
}
#modalbox {
  background: var(--panel2); border: 1px solid var(--border); border-radius: 6px;
  padding: 16px; min-width: 300px; box-shadow: 0 12px 40px rgba(0,0,0,.6);
}
#modalbox h3 { font-size: 14px; margin-bottom: 12px; }
#modalbox .mrow { display: grid; grid-template-columns: 90px 1fr; gap: 8px; align-items: center; margin-bottom: 8px; }
#modalbox .mrow label { color: var(--muted); }
#modalbox input, #modalbox select {
  background: #12151a; border: 1px solid var(--border); color: var(--text);
  font: inherit; padding: 4px 6px; border-radius: 3px; outline: none;
}
#modalbox .mbtns { display: flex; justify-content: flex-end; gap: 8px; margin-top: 14px; }

#toasts { position: fixed; right: 14px; bottom: 40px; z-index: 400; display: flex; flex-direction: column; gap: 6px; }
.toast {
  background: var(--panel2); border: 1px solid var(--border); border-left: 3px solid var(--accent);
  border-radius: 4px; padding: 8px 14px; max-width: 340px; box-shadow: 0 4px 18px rgba(0,0,0,.5);
  animation: slidein .18s ease-out;
}
.toast.warn { border-left-color: var(--warn); }
.toast.err { border-left-color: var(--err); }
.toast.ok { border-left-color: var(--ok); }
@keyframes slidein { from { transform: translateX(30px); opacity: 0; } to { transform: none; opacity: 1; } }