:root {
  --bg: #1c1f25;
  --panel: #24282f;
  --panel2: #2c3139;
  --border: #3a404b;
  --text: #e2e5eb;
  --dim: #929aa6;
  --accent: #3e8aff;
  --accent-dk: #2a569e;
  --hover: #383e49;
  --field: #181b20;
  --danger: #d64848;
  --ok: #46b46e;
  --top-h: 46px;
  --status-h: 26px;
  --left-w: 56px;
  --right-w: 318px;
}
* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; overflow: hidden; background: var(--bg); color: var(--text);
  font: 13px "Segoe UI", system-ui, -apple-system, Roboto, Arial, sans-serif; user-select: none; }
button { font: inherit; color: var(--text); background: var(--panel2); border: 1px solid var(--border);
  border-radius: 6px; padding: 5px 11px; cursor: pointer; white-space: nowrap; }
button:hover { background: var(--hover); border-color: var(--accent-dk); }
button.primary { background: var(--accent-dk); border-color: var(--accent-dk); }
button.primary:hover { background: var(--accent); }
button.danger { background: #782c2c; border-color: #782c2c; }
button.danger:hover { background: var(--danger); }
button.ghost { background: transparent; border-color: transparent; }
button.on { background: var(--accent); border-color: var(--accent); color: #fff; }
button.wide { width: 100%; }
.hidden { display: none !important; }

/* top bar */
#topbar { position: fixed; top: 0; left: 0; right: 0; height: var(--top-h); display: flex; align-items: center;
  gap: 10px; padding: 0 14px; border-bottom: 1px solid var(--border); background: var(--bg); z-index: 5; }
.logo { display: flex; align-items: center; gap: 8px; font-weight: 700; font-size: 18px; margin-right: 12px; }
.tb { display: flex; align-items: center; gap: 6px; overflow: hidden; }
.tb button { font-size: 13px; padding: 5px 10px; }
.sep { width: 1px; height: 22px; background: var(--border); margin: 0 4px; }
.spacer { flex: 1; }
.hintkey { color: var(--dim); }
.seg { display: flex; background: var(--field); border-radius: 7px; padding: 2px; gap: 2px; }
.seg button { border: none; background: transparent; padding: 5px 14px; border-radius: 5px; }
.seg button:hover { background: var(--hover); }
.seg button.on { background: var(--accent); color: #fff; }
#modeSeg button { width: 110px; }

/* layout */
#main { position: fixed; top: var(--top-h); bottom: var(--status-h); left: 0; right: 0; }
#leftbar { position: absolute; top: 0; bottom: 0; left: 0; width: var(--left-w); background: var(--panel);
  border-right: 1px solid var(--border); display: flex; flex-direction: column; align-items: center; padding-top: 8px; gap: 6px; }
#leftbar button.tool { width: 44px; height: 44px; padding: 0; border: none; background: transparent; position: relative;
  display: flex; align-items: center; justify-content: center; color: var(--dim); }
#leftbar button.tool:hover { background: var(--hover); color: var(--text); }
#leftbar button.tool.on { background: var(--accent); color: #fff; }
#leftbar button.tool .k { position: absolute; right: 3px; bottom: 1px; font-size: 10px; opacity: .7; }
#leftbar .lsep { width: 32px; height: 1px; background: var(--border); margin: 6px 0; }
#leftbar button.view { width: 46px; padding: 6px 0; font-size: 12px; border: none; background: transparent; color: var(--dim); }
#leftbar button.view:hover { background: var(--hover); color: var(--text); }
#leftbar button.view.on { background: var(--accent); color: #fff; }

#viewport { position: absolute; top: 0; bottom: 0; left: var(--left-w); right: var(--right-w); overflow: hidden; }
#viewport canvas { position: absolute; left: 0; top: 0; width: 100%; height: 100%; display: block; }
#overlay { pointer-events: none; }
#plan { cursor: crosshair; }
#plan.select { cursor: default; }

#panel { position: absolute; top: 0; bottom: 0; right: 0; width: var(--right-w); background: var(--panel);
  border-left: 1px solid var(--border); overflow-y: auto; padding: 14px 16px 40px; }
#panel::-webkit-scrollbar { width: 8px; }
#panel::-webkit-scrollbar-thumb { background: #4a525e; border-radius: 4px; }
#panel h3 { margin: 6px 0 10px; font-size: 14px; padding-bottom: 7px; border-bottom: 1px solid var(--border); }
#panel .hint { color: var(--dim); line-height: 1.5; margin: 4px 0 12px; }
.frow { display: flex; align-items: center; margin-bottom: 6px; }
.frow label { flex: 0 0 42%; color: var(--dim); }
.frow input, .frow select { flex: 1; min-width: 0; }
input[type=text] { font: inherit; font-size: 14px; color: var(--text); background: var(--field); border: 1px solid var(--border);
  border-radius: 5px; padding: 5px 8px; outline: none; user-select: text; }
input[type=text]:focus { border-color: var(--accent); }
.info { display: flex; justify-content: space-between; margin-bottom: 6px; }
.info span:first-child { color: var(--dim); }
.info span:last-child { font-size: 14px; }
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 6px; margin-bottom: 10px; }
.grid3 { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 5px; margin-bottom: 10px; }
.grid2 button, .grid3 button { font-size: 12px; padding: 6px 4px; overflow: hidden; text-overflow: ellipsis; }
.toggle { display: flex; justify-content: space-between; align-items: center; margin-bottom: 9px; cursor: pointer; font-size: 14px; }
.toggle .sw { width: 38px; height: 20px; border-radius: 10px; background: var(--field); border: 1px solid var(--border); position: relative; }
.toggle .sw::after { content: ""; position: absolute; top: 2px; left: 2px; width: 14px; height: 14px; border-radius: 50%; background: #eef0f4; transition: left .12s; }
.toggle.on .sw { background: var(--accent); border-color: var(--accent); }
.toggle.on .sw::after { left: 20px; }
.lbl { color: var(--dim); margin: 6px 0 4px; }
.segp { display: flex; background: var(--field); border-radius: 6px; padding: 2px; gap: 2px; margin-bottom: 10px; }
.segp button { flex: 1; border: none; background: transparent; font-size: 12px; padding: 5px 2px; }
.segp button.on { background: var(--accent); color: #fff; }
.mats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 6px; margin-bottom: 8px; }
.mat { cursor: pointer; text-align: center; font-size: 11px; color: var(--dim); }
.mat .th { height: 52px; border-radius: 4px; border: 1px solid var(--border); background-size: cover; background-blend-mode: multiply; }
.mat:hover .th { border-color: #fff; }
.mat.on .th { border: 2px solid var(--accent); }
.mat.on { color: var(--text); }
.pal { display: grid; grid-template-columns: repeat(10, 1fr); gap: 4px; margin-bottom: 10px; }
.pal div { aspect-ratio: 1; border-radius: 4px; cursor: pointer; border: 1px solid rgba(0,0,0,.35); }
.pal div:hover { border-color: #fff; }
.pal div.on { outline: 2px solid var(--accent); outline-offset: 1px; }
.slider { margin-bottom: 10px; }
.slider .top { display: flex; justify-content: space-between; color: var(--dim); margin-bottom: 3px; }
.slider .top span:last-child { color: var(--text); }
input[type=range] { width: 100%; accent-color: var(--accent); }
.btnrow { display: flex; gap: 8px; margin-bottom: 8px; }
.btnrow button { flex: 1; }

/* status */
#status { position: fixed; bottom: 0; left: 0; right: 0; height: var(--status-h); display: flex; justify-content: space-between;
  align-items: center; padding: 0 12px; border-top: 1px solid var(--border); background: var(--bg); font-size: 12px; }
#hint { color: var(--dim); overflow: hidden; white-space: nowrap; text-overflow: ellipsis; margin-right: 20px; }
#coords { white-space: nowrap; }

/* cards, toasts, modal */
.card { position: absolute; left: 50%; top: 45%; transform: translate(-50%, -50%); width: 460px; background: var(--panel);
  border-radius: 12px; padding: 24px 28px; box-shadow: 0 8px 30px rgba(0,0,0,.35); }
.card h2 { margin: 0 0 10px; font-size: 20px; }
.card p { color: var(--dim); line-height: 1.5; margin: 0 0 14px; }
.card button { margin-bottom: 8px; padding: 8px; }
.row2 { display: flex; gap: 8px; }
.row2 button { flex: 1; }
#toasts { position: absolute; left: 50%; bottom: 14px; transform: translateX(-50%); display: flex; flex-direction: column-reverse;
  align-items: center; gap: 6px; pointer-events: none; }
.toast { background: rgba(22,25,30,.94); color: #f0f2f6; padding: 7px 14px 7px 12px; border-radius: 16px; font-size: 14px;
  border-left: 4px solid var(--ok); transition: opacity .4s; }
.toast.err { border-left-color: var(--danger); }
#modal { position: fixed; inset: 0; background: rgba(0,0,0,.5); z-index: 20; display: flex; align-items: center; justify-content: center; }
.modal-box { background: var(--panel); border: 1px solid var(--border); border-radius: 10px; padding: 22px 26px; max-width: 92vw; max-height: 90vh; overflow: auto; }
.modal-box h2 { margin: 0 0 16px; font-size: 20px; }
.keys { display: grid; grid-template-columns: auto 1fr auto 1fr; gap: 7px 16px; }
.keys b { color: var(--accent); white-space: nowrap; }
.modal-actions { display: flex; justify-content: flex-end; gap: 8px; margin-top: 18px; }
.gallery { display: grid; grid-template-columns: repeat(3, 280px); gap: 12px; }
.gallery figure { margin: 0; }
.gallery img { width: 280px; border-radius: 6px; border: 1px solid var(--border); display: block; cursor: pointer; }
.gallery figcaption { color: var(--dim); font-size: 12px; margin-top: 3px; }