:root{
  --bg:#0f1216; --panel:#171c23; --panel2:#1f2731; --line:#2b343f;
  --text:#e7edf3; --muted:#8b97a5; --accent:#5b8cff; --accent2:#36c2a6;
  --warn:#ff5b6e; --good:#36c27a;
  --radius:12px;
}
*{box-sizing:border-box}
body{margin:0;font-family:"Segoe UI","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  background:var(--bg);color:var(--text);font-size:14px}
h2{font-size:14px;margin:0 0 10px;color:var(--text);font-weight:600}
button{cursor:pointer;border:1px solid var(--line);background:var(--panel2);color:var(--text);
  padding:7px 12px;border-radius:8px;font-size:13px;transition:.15s}
button:hover:not(:disabled){border-color:var(--accent);color:#fff}
button:disabled{opacity:.4;cursor:not-allowed}
button.primary{background:var(--accent);border-color:var(--accent);color:#fff;width:100%;padding:11px;font-weight:600;margin-top:14px}
button.primary:hover:not(:disabled){filter:brightness(1.1)}
button.warn{background:transparent;border-color:var(--warn);color:var(--warn)}
button.warn:hover:not(:disabled){background:var(--warn);color:#fff}
select,input[type=search]{background:var(--panel2);color:var(--text);border:1px solid var(--line);
  border-radius:8px;padding:7px 9px;font-size:13px}
input[type=range]{accent-color:var(--accent);vertical-align:middle}
.hint{color:var(--muted);font-size:12px;margin:6px 0 14px;line-height:1.5}
.muted{color:var(--muted)}

/* 设备建议横幅 */
.device-tip{display:flex;align-items:center;gap:10px;justify-content:center;flex-wrap:wrap;
  background:linear-gradient(90deg,#2a3550,#22305a);color:#dce6ff;font-size:13px;
  padding:9px 16px;border-bottom:1px solid var(--line)}
.device-tip b{color:#fff}
.device-tip button{background:#ffffff22;border:1px solid #ffffff44;color:#fff;padding:4px 12px;border-radius:7px;font-size:12px}

/* top bar */
.topbar{display:flex;align-items:center;gap:16px;padding:12px 22px;background:var(--panel);
  border-bottom:1px solid var(--line);position:sticky;top:0;z-index:10}
.brand{font-size:18px;font-weight:700}
.tagline{color:var(--muted);font-size:12px}
.tabs{margin-left:auto;display:flex;gap:6px}
.tab{background:transparent;border:none;color:var(--muted);padding:8px 14px;border-radius:8px}
.tab.active{background:var(--panel2);color:#fff}

/* tab panes */
.tabpane{display:none;padding:18px 22px}
.tabpane.active{display:block}
#tab-design{display:none;grid-template-columns:300px minmax(0,1fr) 320px;gap:16px;align-items:start}
#tab-design.active{display:grid}
.panel{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:16px;min-width:0}

/* controls */
.controls h2{margin-top:18px}
.controls h2:first-child{margin-top:0}
/* 可折叠分区 */
.sect{margin:0}
.sect>summary{list-style:none;cursor:pointer;font-size:14px;font-weight:600;color:var(--text);
  padding:11px 2px;display:flex;align-items:center;gap:8px;user-select:none}
.sect>summary::-webkit-details-marker{display:none}
.sect>summary::before{content:'▸';color:var(--accent);font-size:11px;transition:transform .15s;flex:none}
.sect[open]>summary::before{transform:rotate(90deg)}
.sect>summary::after{content:'展开';margin-left:auto;color:var(--muted);font-size:11px;font-weight:400;
  border:1px solid var(--line);border-radius:6px;padding:2px 8px}
.sect[open]>summary::after{content:'收起'}
.sect>summary:hover{color:var(--accent)}
.sect>summary:hover::after{border-color:var(--accent);color:var(--accent)}
/* 链接式按钮 */
.link-btn{background:none;border:none;color:var(--accent);padding:8px 0;font-size:13px;text-align:left}
.link-btn:hover{text-decoration:underline;color:var(--accent)}
.controls .sect{border-bottom:1px solid var(--line)}
.controls .sect:last-of-type{border-bottom:none}
.controls .sect>*:last-child{margin-bottom:12px}
.bom .sect>summary{padding:8px 2px}
.drop{display:flex;align-items:center;justify-content:center;height:120px;border:2px dashed var(--line);
  border-radius:10px;color:var(--muted);text-align:center;cursor:pointer;background:var(--panel2);overflow:hidden}
.drop.drag{border-color:var(--accent);color:var(--text)}
.drop img{max-width:100%;max-height:100%;object-fit:contain}
.row{display:flex;flex-direction:column;gap:6px;margin:10px 0}
.row label{color:var(--muted);font-size:12px}
.row b{color:var(--accent)}
.check{display:flex;align-items:center;gap:8px;margin:9px 0;font-size:13px;color:var(--text);cursor:pointer}
.check input{accent-color:var(--accent)}
.hidden{display:none!important}
select{width:100%}

/* preview */
.preview{min-height:400px}
.preview-toolbar{display:flex;align-items:center;gap:14px;flex-wrap:wrap;margin-bottom:12px}
.preview-toolbar .spacer{flex:0 0 8px}
.preview-toolbar h2{margin:0}
/* edit toolbar */
.edit-toolbar{display:flex;align-items:center;gap:8px;flex-wrap:wrap;margin-bottom:10px;
  padding:8px 10px;background:var(--panel2);border:1px solid var(--line);border-radius:8px;position:relative}
.edit-toolbar .spacer{flex:1}
.et-label{color:var(--muted);font-size:12px;margin-right:2px}
.etool{padding:6px 10px;font-size:12px}
.etool.active{background:var(--accent);border-color:var(--accent);color:#fff}
.brush-pick{display:flex;align-items:center;gap:7px;font-size:12px}
.brush-pick .sw{width:18px;height:18px;border-radius:4px;border:1px solid #0006;background:#888}
.color-pop{position:absolute;top:46px;right:8px;z-index:30;width:330px;max-height:340px;overflow:auto;
  background:var(--panel);border:1px solid var(--accent);border-radius:10px;padding:10px;box-shadow:0 10px 30px #000a}
.color-pop input{width:100%;margin-bottom:8px}
.pop-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(54px,1fr));gap:5px}
.pop-cell{cursor:pointer;border:1px solid var(--line);border-radius:6px;overflow:hidden;text-align:center}
.pop-cell:hover{border-color:var(--accent)}
.pop-cell .sw{width:100%;height:30px;border:none;border-radius:0}
.pop-cell .c{font-size:10px;padding:2px 0;font-weight:600}
canvas.editing{cursor:crosshair}
.hover-tip{position:fixed;z-index:40;pointer-events:none;background:#000d;border:1px solid var(--accent);
  border-radius:7px;padding:5px 8px;font-size:12px;display:flex;align-items:center;gap:7px;white-space:nowrap}
.hover-tip .sw{width:16px;height:16px;border-radius:4px;border:1px solid #fff5}
.tip-box{position:fixed;z-index:60;pointer-events:none;max-width:260px;background:#000e;color:#eaf0f6;
  border:1px solid var(--accent);border-radius:8px;padding:7px 10px;font-size:12px;line-height:1.5;
  box-shadow:0 8px 24px #000b}
.batch-lbl{color:var(--muted);font-size:11px}
.inv-batch{display:inline-flex;gap:4px;align-items:center}
.inv-batch input[type=number]{width:64px;background:var(--panel2);color:var(--text);
  border:1px solid var(--line);border-radius:6px;padding:6px;font-size:13px}
.canvas-wrap{position:relative;overflow:auto;max-height:74vh;background:
  repeating-conic-gradient(#1a1f26 0 25%,#222a33 0 50%) 0/22px 22px;border-radius:8px;border:1px solid var(--line);padding:10px;text-align:center}
canvas{image-rendering:pixelated;display:inline-block}
.placeholder{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;color:var(--muted)}

/* BOM */
.bom-head{display:flex;justify-content:space-between;align-items:baseline}
.bom-stats{color:var(--muted);font-size:12px;text-align:right;line-height:1.5}
.bom-actions{margin:10px 0}
.bom-list{display:flex;flex-direction:column;gap:4px;max-height:70vh;overflow:auto}
.bom-row{display:grid;grid-template-columns:22px 1fr auto;gap:10px;align-items:center;
  padding:7px 8px;border-radius:8px;background:var(--panel2)}
.bom-row.short{outline:1px solid var(--warn)}
.sw{width:22px;height:22px;border-radius:5px;border:1px solid #0006}
.bom-meta{display:flex;flex-direction:column;line-height:1.3}
.bom-code{font-weight:600}
.bom-name{color:var(--muted);font-size:11px}
.bom-count{text-align:right;font-variant-numeric:tabular-nums;font-size:12px}
.bom-count .need{font-weight:600}
.bom-count .stock{color:var(--muted)}
.bom-count .lack{color:var(--warn);font-weight:600}
.bom-count .ok{color:var(--good)}

/* inventory & palette grids */
.inv-head{display:flex;justify-content:space-between;align-items:center;gap:12px;flex-wrap:wrap;margin-bottom:8px}
.inv-tools{display:flex;gap:8px;flex-wrap:wrap;align-items:center}
.inv-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:8px;margin-top:12px}
.inv-cell{display:flex;align-items:center;gap:8px;padding:7px;border:1px solid var(--line);
  border-radius:9px;background:var(--panel2)}
.inv-cell.owned{border-color:var(--accent2)}
.inv-cell .sw{width:26px;height:26px;flex:none}
.inv-cell .info{flex:1;min-width:0;line-height:1.25}
.inv-cell .c{font-weight:600;font-size:12px}
.inv-cell .n{color:var(--muted);font-size:10px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.inv-cell input[type=number]{width:48px;background:var(--panel);color:var(--text);
  border:1px solid var(--line);border-radius:6px;padding:4px;font-size:12px;text-align:center}
.inv-cell input[type=checkbox]{accent-color:var(--accent2)}

.pal-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(120px,1fr));gap:8px;margin-top:12px}
.pal-cell{border:1px solid var(--line);border-radius:9px;overflow:hidden;background:var(--panel2)}
.pal-cell .sw{width:100%;height:54px;border:none;border-radius:0}
.pal-cell .lbl{padding:6px 8px;line-height:1.3}
.pal-cell .c{font-weight:600;font-size:12px}
.pal-cell .h{color:var(--muted);font-size:10px;font-family:monospace}

/* 图片预处理页 */
.pp-wrap{display:grid;grid-template-columns:320px minmax(0,1fr);gap:16px;align-items:start}
.pp-presets{display:flex;flex-wrap:wrap;gap:8px}
.pp-presets button{flex:1 1 auto;min-width:84px}
.pp-apply{display:flex;gap:8px;margin-top:14px}
.pp-apply .primary{margin-top:0}
.pp-apply #ppRevert{flex:none}
.pp-prev-head{display:flex;align-items:baseline;gap:10px;margin-bottom:10px}
.pp-prev-head h2{margin:0}
.pp-canvas-wrap{position:relative;min-height:300px;display:flex;align-items:center;justify-content:center;
  background:repeating-conic-gradient(#1a1f26 0 25%,#222a33 0 50%) 0/22px 22px;
  border:1px solid var(--line);border-radius:8px;padding:10px;max-height:78vh;overflow:auto}
#ppCanvas{max-width:100%;max-height:74vh;border-radius:4px;image-rendering:auto}
@media(max-width:1100px){.pp-wrap{grid-template-columns:1fr}}

/* footer */
.site-foot{max-width:900px;margin:30px auto 40px;padding:18px 22px;text-align:center;
  color:var(--muted);font-size:12px;line-height:1.7;border-top:1px solid var(--line)}
.site-foot p{margin:4px 0}
.site-foot b{color:var(--text)}
.site-foot a{color:var(--accent);text-decoration:none}
.site-foot a:hover{text-decoration:underline}
.foot-disc{font-size:11px;opacity:.8;max-width:680px;margin:8px auto 0}

/* ---------- 响应式 / 屏幕适配 ---------- */
/* 平板及以下：三栏 → 单栏 */
/* 底部导航（仅手机显示）：每个分区一个按钮 */
.mnav{display:none;gap:4px;padding:7px 6px;background:var(--panel);border-top:1px solid var(--line)}
.mnav button{flex:1;min-width:0;display:flex;flex-direction:column;align-items:center;gap:2px;
  padding:7px 1px;font-size:16px;line-height:1;background:var(--panel2)}
.mnav button span{font-size:10px;color:var(--muted)}
.mnav button.active{background:var(--accent);border-color:var(--accent)}
.mnav button.active span{color:#fff}
.sheet-grip{display:none}

/* 平板：三栏 → 单栏，预览置顶，正常滚动 */
@media(max-width:1100px){
  #tab-design.active{grid-template-columns:minmax(0,1fr)}
  .preview{order:-1}
  .canvas-wrap{max-height:48vh}
  .pp-wrap{grid-template-columns:1fr}
  .pp-preview{order:-1}
  #ppCanvas{max-height:42vh}
}

/* ===== 手机：App 式固定布局（预览满屏 + 底部抽屉，页面不滚动） ===== */
@media(max-width:780px){
  html{height:100%}
  body{height:100dvh;display:flex;flex-direction:column;overflow:hidden;overscroll-behavior:none;font-size:13px}
  .device-tip{flex:none}
  .site-foot{display:none}                 /* App 模式下隐藏页脚，避免双底栏 */
  .topbar{flex:none;position:static;flex-wrap:wrap;gap:8px 12px;padding:9px 12px}
  .brand{font-size:16px}.tagline{display:none}
  .tabs{width:100%;margin-left:0;overflow-x:auto;-webkit-overflow-scrolling:touch}
  .tab{flex:1 0 auto;text-align:center;padding:9px 8px;font-size:12px;white-space:nowrap}

  /* 每个标签页填满剩余高度 */
  .tabpane{flex:1;min-height:0;padding:0}
  .tabpane.active:not(#tab-design){overflow:auto;padding:12px}   /* 库存/色卡/预处理：内部滚动 */

  /* 图纸设计：预览只剩画布占满屏；所有工具都收到底部（仿 Instagram/美图秀秀） */
  #tab-design.active{display:flex;flex-direction:column;align-items:stretch;min-height:0;min-width:0;gap:0;position:relative;overflow:hidden}
  .preview{flex:1;min-height:0;min-width:0;margin:0;border:none;border-radius:0;overflow:hidden;
    display:flex;flex-direction:column;padding:8px 8px 0}
  .canvas-wrap{flex:1;min-height:0;min-width:0;max-height:none}

  /* 统一的底部弹出面板：相对 #tab-design 绝对定位（避开 fixed 在异常视口下的问题），
     从底向上滑出覆盖预览下部，内部滚动，页面不动 */
  .controls,.bom,.preview-toolbar,.edit-toolbar{
    position:absolute;left:0;right:0;bottom:56px;z-index:25;margin:0;
    max-height:54vh;overflow:auto;background:var(--panel);
    border:none;border-top:1px solid var(--line);border-radius:16px 16px 0 0;
    box-shadow:0 -12px 30px #000c;padding:4px 14px 16px;
    transform:translateY(118%);transition:transform .22s ease;visibility:hidden}
  .controls.sheet-open,.bom.sheet-open,.preview-toolbar.sheet-open,.edit-toolbar.sheet-open{
    transform:translateY(0);visibility:visible}
  .controls.sheet-open .sect{display:none}           /* 抽屉里只显示选中的那一个分区 */
  .controls.sheet-open .sect.active-sect{display:block}
  .edit-toolbar{overflow:visible}                    /* 让取色弹窗能溢出显示 */
  .edit-toolbar .spacer{display:none}
  .preview-toolbar h2,.preview-toolbar .spacer{display:none}
  .sheet-grip{display:block;flex-basis:100%;width:100%;height:16px;position:relative;margin:0 0 4px}
  .sheet-grip::before{content:'';position:absolute;left:50%;top:5px;transform:translateX(-50%);
    width:40px;height:4px;border-radius:3px;background:var(--line)}

  /* 底部导航栏：在 #tab-design 流式底部，横向可滚（仿 IG 调整项图标条） */
  .mnav{flex:none;height:56px;min-width:0;z-index:30;display:flex}

  /* 触屏更友好（手柄≥44px 触区，实时数值已在标签上） */
  input[type=range]{height:34px}
  .sect>summary{padding:14px 2px}
  button{padding:10px 13px}
  .pp-presets button{flex:1 1 40%}
  .inv-head,.inv-tools{gap:6px}
  .et-label{width:100%}
  .inv-grid{grid-template-columns:repeat(auto-fill,minmax(132px,1fr));gap:6px}
  .pal-grid{grid-template-columns:repeat(auto-fill,minmax(100px,1fr))}
  .pop-grid{grid-template-columns:repeat(auto-fill,minmax(48px,1fr))}
  .color-pop{position:absolute;left:0;right:0;width:auto;bottom:calc(100% + 6px);top:auto;max-height:46vh}
  .inv-tools input[type=search]{flex:1;min-width:120px}
  .inv-batch{flex-wrap:wrap}
  .tip-box{max-width:78vw}
}