/* ============================================================
   拼图工坊 · styles.css
   ============================================================ */
:root{
  --accent:#2563eb; --accent-h:#1d4ed8; --accent-s:#dbeafe;
  --bg:#eef2f7; --surface:#ffffff; --surface-2:#f8fafc;
  --text:#0f172a; --text-2:#475569; --text-3:#94a3b8;
  --border:#e2e8f0; --border-2:#cbd5e1;
  --danger:#dc2626; --danger-s:#fee2e2; --ok:#059669;
  --shadow:0 1px 3px rgba(15,23,42,.06), 0 8px 24px rgba(15,23,42,.06);
  --radius:14px; --radius-s:9px;
  --topbar-h:60px; --panel-w:308px; --panel-r:300px;
}
html[data-theme="dark"]{
  --accent:#3b82f6; --accent-h:#60a5fa; --accent-s:#1e3a8a33;
  --bg:#0b1120; --surface:#111827; --surface-2:#1a2333;
  --text:#e8edf5; --text-2:#a5b0c2; --text-3:#6b7a90;
  --border:#232f43; --border-2:#33415a;
  --danger:#f87171; --danger-s:#7f1d1d33; --ok:#34d399;
  --shadow:0 1px 3px rgba(0,0,0,.4), 0 8px 24px rgba(0,0,0,.35);
}

*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0; background:var(--bg); color:var(--text);
  font:14px/1.55 system-ui,-apple-system,"Segoe UI","Microsoft YaHei",sans-serif;
  -webkit-font-smoothing:antialiased;
  display:flex; flex-direction:column; overflow:hidden;
}
.hidden{display:none !important}
kbd{background:var(--surface-2);border:1px solid var(--border);border-bottom-width:2px;border-radius:5px;padding:1px 5px;font:12px/1.4 ui-monospace,Consolas,monospace}
code{background:var(--surface-2);border:1px solid var(--border);border-radius:4px;padding:0 4px;font-size:12px}
::-webkit-scrollbar{width:9px;height:9px}
::-webkit-scrollbar-thumb{background:var(--border-2);border-radius:9px}
::-webkit-scrollbar-track{background:transparent}

/* ---------------- topbar ---------------- */
.topbar{
  height:var(--topbar-h); flex:0 0 auto; display:flex; align-items:center;
  justify-content:space-between; gap:12px; padding:0 16px;
  background:var(--surface); border-bottom:1px solid var(--border); z-index:30;
}
.brand{display:flex;align-items:center;gap:11px;min-width:0}
.logo{
  width:34px;height:34px;border-radius:10px;flex:0 0 auto;
  background:
    linear-gradient(135deg,var(--accent),#7c3aed);
  position:relative;box-shadow:0 4px 12px rgba(37,99,235,.32)
}
.logo::before,.logo::after{content:"";position:absolute;background:#fff;border-radius:2px;opacity:.95}
.logo::before{left:7px;top:7px;width:9px;height:20px}
.logo::after{left:19px;top:7px;width:8px;height:9px;box-shadow:0 11px 0 0 #fff}
.brand-txt{display:flex;flex-direction:column;line-height:1.2;min-width:0}
.brand-txt b{font-size:15px;letter-spacing:.2px}
.brand-txt small{color:var(--text-3);font-size:11.5px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.topbar-actions{display:flex;align-items:center;gap:8px}
.badge{
  font:600 11.5px/1 ui-monospace,Consolas,monospace;color:var(--text-2);
  background:var(--surface-2);border:1px solid var(--border);
  padding:6px 9px;border-radius:8px;white-space:nowrap
}

/* ---------------- workspace ---------------- */
.workspace{flex:1 1 auto;display:flex;min-height:0}
.panel{
  background:var(--surface);overflow-y:auto;overflow-x:hidden;
  display:flex;flex-direction:column;gap:0;z-index:20;
}
.panel-left{width:var(--panel-w);flex:0 0 var(--panel-w);border-right:1px solid var(--border)}
.panel-right{width:var(--panel-r);flex:0 0 var(--panel-r);border-left:1px solid var(--border)}

/* groups */
.grp{border-bottom:1px solid var(--border)}
.grp-t{
  margin:0;padding:13px 16px;font-size:12.5px;font-weight:700;letter-spacing:.4px;
  color:var(--text-2);text-transform:none;display:flex;align-items:center;
  justify-content:space-between;cursor:pointer;user-select:none;
}
.grp-t::before{content:"";width:0;height:0;border:4px solid transparent;border-left-color:var(--text-3);margin-right:8px;transform:rotate(90deg);transition:transform .16s}
.grp[data-open="0"] .grp-t::before{transform:rotate(0)}
.grp-t>span:first-of-type{}
.grp-t{justify-content:flex-start}
.grp-hint{margin-left:auto;font:600 11px/1 ui-monospace,Consolas,monospace;color:var(--accent);background:var(--accent-s);padding:4px 7px;border-radius:6px}
.grp[data-open="0"] .grp-b{display:none}
.grp-b{padding:0 14px 15px}

.row{display:flex;align-items:center;gap:8px;margin-bottom:9px}
.row:last-child{margin-bottom:0}
.fl{flex:0 0 68px;font-size:12px;color:var(--text-2);white-space:nowrap}
.note{margin:8px 0 0;font-size:11.5px;color:var(--text-3);line-height:1.55}
.pair{display:flex;gap:8px;align-items:center;margin-bottom:9px}
.pair:last-child{margin-bottom:0}
.x{color:var(--text-3);font-size:12px}

/* range */
.rng{flex:1 1 auto;-webkit-appearance:none;appearance:none;height:5px;border-radius:5px;background:var(--border);outline:none;min-width:0}
.rng::-webkit-slider-thumb{-webkit-appearance:none;width:15px;height:15px;border-radius:50%;background:var(--accent);border:2px solid var(--surface);box-shadow:0 1px 4px rgba(0,0,0,.3);cursor:pointer}
.rng::-moz-range-thumb{width:15px;height:15px;border-radius:50%;background:var(--accent);border:2px solid var(--surface);cursor:pointer}
output{flex:0 0 46px;text-align:right;font:600 11.5px/1 ui-monospace,Consolas,monospace;color:var(--text-2)}

/* inputs */
.num,.txt,.sel{
  background:var(--surface-2);border:1px solid var(--border);border-radius:var(--radius-s);
  color:var(--text);padding:7px 9px;font:inherit;font-size:13px;outline:none;min-width:0;width:100%
}
.num{flex:1 1 0;text-align:center}
.txt{flex:1 1 auto}
.sel{cursor:pointer}
.num:focus,.txt:focus,.sel:focus{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-s)}
.clr{
  width:40px;height:30px;padding:2px;border:1px solid var(--border);border-radius:8px;
  background:var(--surface-2);cursor:pointer;flex:0 0 auto
}
.clr::-webkit-color-swatch-wrapper{padding:0}
.clr::-webkit-color-swatch{border:none;border-radius:5px}

/* buttons */
.btn{
  border:1px solid var(--border);background:var(--surface);color:var(--text);
  border-radius:var(--radius-s);padding:8px 12px;font:inherit;font-weight:600;font-size:13px;
  cursor:pointer;transition:.13s;white-space:nowrap;display:inline-flex;
  align-items:center;justify-content:center;gap:6px
}
.btn:hover:not(:disabled){border-color:var(--border-2);background:var(--surface-2)}
.btn:active:not(:disabled){transform:translateY(1px)}
.btn:disabled{opacity:.42;cursor:not-allowed}
.btn.primary{background:var(--accent);border-color:var(--accent);color:#fff}
.btn.primary:hover:not(:disabled){background:var(--accent-h);border-color:var(--accent-h)}
.btn.danger{color:var(--danger);border-color:var(--danger);background:transparent}
.btn.danger:hover:not(:disabled){background:var(--danger-s)}
.btn.ghost{background:var(--surface-2)}
.btn.sm{padding:6px 10px;font-size:12.5px}
.btn.xs{padding:6px 9px;font-size:12px;flex:1 1 0}
.btn.wide{width:100%;margin-bottom:9px}
.btn.wide:last-child{margin-bottom:0}

/* segmented */
.seg{display:flex;background:var(--surface-2);border:1px solid var(--border);border-radius:var(--radius-s);padding:2px;gap:2px;flex:1 1 auto;min-width:0}
.seg button{
  flex:1 1 0;border:none;background:transparent;color:var(--text-2);font:600 12px/1 inherit;
  padding:7px 4px;border-radius:6px;cursor:pointer;transition:.13s;white-space:nowrap;overflow:hidden;text-overflow:ellipsis
}
.seg button:hover{color:var(--text)}
.seg button.on{background:var(--surface);color:var(--accent);box-shadow:0 1px 3px rgba(0,0,0,.1)}
html[data-theme="dark"] .seg button.on{background:var(--accent);color:#fff}
.seg.small button{font-size:11.5px;padding:6px 9px}

/* chips (ratio) */
.chip-row{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:11px}
.chip{
  border:1px solid var(--border);background:var(--surface-2);color:var(--text-2);
  border-radius:20px;padding:5px 11px;font:600 12px/1 inherit;cursor:pointer;transition:.13s
}
.chip:hover{border-color:var(--accent);color:var(--accent)}
.chip.on{background:var(--accent);border-color:var(--accent);color:#fff}

/* layout grid */
.layout-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:7px;margin-bottom:11px}
.ly{
  aspect-ratio:1/1;border:1px solid var(--border);background:var(--surface-2);
  border-radius:9px;cursor:pointer;padding:5px;display:grid;gap:2px;transition:.13s;position:relative
}
.ly:hover{border-color:var(--accent)}
.ly.on{border-color:var(--accent);background:var(--accent-s);box-shadow:0 0 0 2px var(--accent-s)}
.ly i{background:var(--border-2);border-radius:2px;display:block}
.ly.on i{background:var(--accent)}
.ly::after{content:attr(data-label);position:absolute;bottom:-2px;right:2px;font:600 8.5px/1 inherit;color:var(--text-3)}
.ly.on::after{color:var(--accent)}

/* switch */
.switch{position:relative;display:inline-flex;flex:0 0 auto;margin-left:auto}
.switch input{position:absolute;opacity:0;width:100%;height:100%;margin:0;cursor:pointer}
.switch span{width:38px;height:21px;border-radius:20px;background:var(--border-2);display:block;transition:.16s;position:relative}
.switch span::after{content:"";position:absolute;top:2px;left:2px;width:17px;height:17px;border-radius:50%;background:#fff;transition:.16s;box-shadow:0 1px 3px rgba(0,0,0,.3)}
.switch input:checked+span{background:var(--accent)}
.switch input:checked+span::after{transform:translateX(17px)}
.switch-line{display:flex;align-items:center;gap:9px;font-size:12.5px;font-weight:600;color:var(--text-2);cursor:pointer;padding:9px 0 5px}
.switch-line input{accent-color:var(--accent);width:15px;height:15px;cursor:pointer}
.sub{padding:4px 0 8px;border-left:2px solid var(--border);padding-left:10px;margin-left:4px;margin-bottom:6px}
.sub .row .fl{flex:0 0 54px;font-size:12px}

/* swatches */
.swatches{display:flex;gap:6px;margin-left:auto}
.swatches button{width:24px;height:24px;border-radius:7px;border:2px solid var(--border);background:var(--c);cursor:pointer;padding:0;transition:.13s}
.swatches button.on{border-color:var(--accent);transform:scale(1.1)}

/* stage */
.stage{flex:1 1 auto;display:flex;flex-direction:column;min-width:0;min-height:0;background:var(--bg)}
.stage-bar{
  flex:0 0 auto;display:flex;align-items:center;gap:12px;padding:9px 14px;
  background:var(--surface);border-bottom:1px solid var(--border);flex-wrap:wrap
}
.stage-tip{font-size:11.5px;color:var(--text-3);flex:1 1 auto;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.stage-right{display:flex;gap:7px}
.stage-host{
  flex:1 1 auto;position:relative;overflow:auto;padding:22px;
  display:flex;align-items:center;justify-content:center;min-height:260px;
  background-image:
    linear-gradient(45deg,var(--border) 25%,transparent 25%,transparent 75%,var(--border) 75%),
    linear-gradient(45deg,var(--border) 25%,transparent 25%,transparent 75%,var(--border) 75%);
  background-size:18px 18px;background-position:0 0,9px 9px;background-color:var(--bg)
}
html[data-theme="dark"] .stage-host{background-blend-mode:multiply}
#canvas{
  display:block;flex:0 0 auto;background:#fff;
  box-shadow:0 10px 40px rgba(15,23,42,.18);border-radius:6px;touch-action:none
}
.stage-host.mode-100{align-items:flex-start;justify-content:flex-start;padding:14px}
.drop-mask{
  position:absolute;inset:10px;border:2.5px dashed var(--accent);border-radius:16px;
  background:var(--accent-s);display:none;align-items:center;justify-content:center;
  font-weight:700;color:var(--accent);font-size:16px;z-index:9;pointer-events:none
}
.stage-host.dragover .drop-mask{display:flex}
.empty{
  position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;
  gap:9px;text-align:center;color:var(--text-2);background:transparent;pointer-events:none
}
.empty>*{pointer-events:auto}
.empty-ic{font-size:40px;opacity:.65}
.empty h2{margin:0;font-size:17px;color:var(--text)}
.empty p{margin:0;font-size:12.5px;color:var(--text-3);max-width:420px}

/* thumbs */
.thumb-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:7px}
.thumb{
  position:relative;aspect-ratio:1/1;border-radius:9px;overflow:hidden;
  border:1.5px solid var(--border);background:var(--surface-2);cursor:grab
}
.thumb img{width:100%;height:100%;object-fit:cover;display:block;pointer-events:none}
.thumb.on{border-color:var(--accent);box-shadow:0 0 0 2px var(--accent-s)}
.thumb.used{border-color:var(--ok)}
.thumb .th-idx{
  position:absolute;left:3px;top:3px;background:rgba(0,0,0,.62);color:#fff;
  font:600 9.5px/1 ui-monospace,monospace;padding:3px 5px;border-radius:5px
}
.thumb .th-del{
  position:absolute;right:3px;top:3px;width:18px;height:18px;border-radius:50%;
  background:rgba(0,0,0,.62);color:#fff;border:none;font-size:12px;line-height:1;cursor:pointer;
  display:none;align-items:center;justify-content:center
}
.thumb:hover .th-del{display:flex}
.thumb.drag-over{outline:2px dashed var(--accent);outline-offset:-3px}
.thumb.dragging{opacity:.4}

.preset-list{display:flex;flex-direction:column;gap:5px;margin-bottom:9px}
.preset-list:empty::after{content:"暂无预设";font-size:11.5px;color:var(--text-3)}
.preset{
  display:flex;align-items:center;gap:7px;background:var(--surface-2);border:1px solid var(--border);
  border-radius:8px;padding:6px 9px;font-size:12px
}
.preset b{font-weight:600;flex:1 1 auto;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;color:var(--text)}
.preset button{border:none;background:transparent;color:var(--text-3);cursor:pointer;font-size:13px;padding:2px 4px;border-radius:4px}
.preset button:hover{color:var(--accent)}
.preset button.del:hover{color:var(--danger)}
.est{
  font:600 11.5px/1.5 ui-monospace,Consolas,monospace;color:var(--text-3);
  background:var(--surface-2);border:1px dashed var(--border);border-radius:8px;
  padding:8px 10px;margin-bottom:9px;white-space:pre-line
}

/* mobile tabs */
.mobile-tabs{display:none}
@media (max-width:1080px){
  :root{--panel-w:290px;--panel-r:270px}
  .layout-grid{grid-template-columns:repeat(4,1fr)}
}
@media (max-width:860px){
  body{overflow:auto}
  .workspace{flex-direction:column;min-height:0}
  .panel{width:100%;flex:1 1 auto;border:none;order:2}
  .panel-right{order:3}
  .stage{order:1;min-height:52vh}
  .panel-left,.panel-right{display:none}
  body.tab-left .panel-left{display:flex}
  body.tab-right .panel-right{display:flex}
  body.tab-stage .stage{display:flex}
  body.tab-left .stage,body.tab-right .stage{display:none}
  .mobile-tabs{
    display:flex;position:sticky;bottom:0;flex:0 0 auto;background:var(--surface);
    border-top:1px solid var(--border);z-index:40
  }
  .mobile-tabs button{
    flex:1 1 0;border:none;background:transparent;color:var(--text-3);font:600 12.5px/1 inherit;
    padding:13px 0;cursor:pointer
  }
  .mobile-tabs button.on{color:var(--accent);box-shadow:inset 0 -2px 0 var(--accent)}
  .brand-txt small{display:none}
}

/* modal */
.modal{position:fixed;inset:0;background:rgba(15,23,42,.55);backdrop-filter:blur(3px);z-index:100;display:flex;align-items:center;justify-content:center;padding:20px}
.modal[hidden]{display:none}
.modal-card{
  background:var(--surface);border-radius:18px;max-width:620px;width:100%;
  max-height:86vh;display:flex;flex-direction:column;box-shadow:0 24px 60px rgba(0,0,0,.32);overflow:hidden
}
.modal-card h2{margin:0;padding:20px 22px 14px;font-size:17px;border-bottom:1px solid var(--border)}
.modal-body{padding:18px 22px;overflow-y:auto;font-size:13.5px;color:var(--text-2)}
.modal-body h4{margin:16px 0 7px;font-size:13.5px;color:var(--text)}
.modal-body h4:first-child{margin-top:0}
.modal-body ol{margin:0;padding-left:20px}
.modal-body li{margin-bottom:5px}
.modal-body p{margin:6px 0}
.kbd-table{border-collapse:collapse;width:100%}
.kbd-table td{padding:5px 8px;border-bottom:1px solid var(--border);font-size:12.5px}
.kbd-table td:first-child{white-space:nowrap;width:44%}
.modal-foot{padding:14px 22px;border-top:1px solid var(--border);display:flex;justify-content:flex-end}

/* toast */
.toast{
  position:fixed;left:50%;bottom:26px;transform:translate(-50%,20px);
  background:var(--text);color:var(--bg);padding:10px 18px;border-radius:11px;
  font-size:13px;font-weight:600;opacity:0;pointer-events:none;transition:.22s;z-index:200;
  box-shadow:0 10px 30px rgba(0,0,0,.3);max-width:80vw;text-align:center
}
.toast.show{opacity:1;transform:translate(-50%,0)}
.toast.err{background:var(--danger);color:#fff}