:root{
  --paper:#fdfbf9;
  --ink:#2b1a07;
  --muted:#8a7b6a;
  --soft:#756350;
  --line:#e6ddd2;
  --card:#fffcf9;
  --orange:#ff6f1e;
  --orange-deep:#f05d10;
  --stage:#f0ece4;
  --radius:20px;
  --ui-sans:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  background:var(--paper);color:var(--ink);
  font-family:var(--ui-sans);font-size:16px;line-height:1.45;
  -webkit-font-smoothing:antialiased;
}
button,input,textarea,select{font:inherit;color:inherit}
button{cursor:pointer}
h1,h2{margin:0}
a{color:inherit}

/* ---------- header ---------- */
header{
  height:72px;display:flex;align-items:center;gap:20px;padding:0 4%;
  border-bottom:1px solid #00000008;background:#ffffffcc;backdrop-filter:blur(24px);
  position:sticky;top:0;z-index:40;
}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;
  font-size:25px;font-weight:800;letter-spacing:-.8px}
.brand-icon{height:32px;width:32px;border-radius:10px;background:var(--orange);
  display:flex;align-items:center;justify-content:center;box-shadow:2px 2px 0 var(--ink)}
.brand-icon svg{width:22px;height:22px}
.header-title{font-size:14px;color:var(--muted);border-left:1px solid var(--line);padding-left:20px}
.version{margin-left:auto;font-size:12px;color:var(--muted);white-space:nowrap}
.header-share{display:flex;align-items:center;gap:8px;font-size:12px;color:var(--muted)}
.header-share input{
  width:210px;padding:8px 12px;border:1px solid var(--line);border-radius:100px;
  background:#fff;font-size:12px;outline:none}
.header-share input:focus{border-color:var(--orange)}

/* ---------- layout ---------- */
main{max-width:1640px;margin:auto;padding:30px 4% 56px;
  display:grid;grid-template-columns:minmax(0,1fr) 420px;gap:30px;align-items:start}
.workspace{min-width:0}
.workspace-heading{display:flex;justify-content:space-between;align-items:flex-end;margin-bottom:18px}
.workspace-heading h1{font-size:28px;font-weight:700;letter-spacing:-.9px}
.workspace-heading p{color:var(--muted);font-size:14px;margin:6px 0 0}
.live-badge{font-size:12px;border-radius:20px;background:#fff;padding:8px 14px;color:var(--muted);
  border:1px solid var(--line);white-space:nowrap}

/* ---------- stage ---------- */
.stage{
  position:relative;height:min(64vh,580px);min-height:340px;border-radius:24px;overflow:hidden;
  background:radial-gradient(120% 110% at 50% 8%,#fffefb 0%,var(--stage) 62%,#e6e0d5 100%);
  border:1px solid #00000006;
}
.stage-top{position:absolute;z-index:3;left:24px;right:24px;top:22px;display:flex;justify-content:space-between;pointer-events:none}
.stage-top strong{display:block;font-size:15px;font-weight:600}
.stage-top span{display:block;font-size:12px;color:var(--muted);margin-top:4px}
.stage-top-actions{display:flex;gap:8px}
.icon-button{pointer-events:auto;width:36px;height:36px;border-radius:50%;
  border:1px solid var(--line);background:#fffdf8cc;color:var(--soft);font-size:19px;line-height:1}
.icon-button:hover{background:#fff;color:var(--ink)}
#canvas{position:absolute;inset:0}
#canvas canvas{display:block;width:100%;height:100%;touch-action:none}
.preview-notice{position:absolute;top:70px;left:12px;right:12px;text-align:center;
  font-size:11px;color:var(--soft);pointer-events:none}
.view-buttons{position:absolute;z-index:3;bottom:20px;left:50%;transform:translateX(-50%);
  display:flex;gap:4px;padding:4px;border-radius:24px;background:#fff9f1cc;backdrop-filter:blur(20px);
  border:1px solid #fff8;box-shadow:0 6px 18px #00000008;width:max-content;max-width:calc(100% - 24px)}
.view-buttons button{border:0;border-radius:20px;background:none;color:var(--soft);
  font-size:12px;padding:9px 14px;white-space:nowrap;display:inline-flex;align-items:center;gap:6px}
.view-buttons button:hover{background:#ffffffcc}
.view-buttons .active{background:#fff;box-shadow:0 2px 7px #0000000f;color:var(--ink)}
.toggle-state{font-size:9px;font-weight:700;min-width:26px;padding:2px 5px;border-radius:6px;
  background:#eee5d8;color:var(--soft);text-align:center}
.view-buttons .active .toggle-state{background:var(--orange);color:#fff}
/* 「视角」折叠开关只在移动端出现（选择器要比 .view-buttons button 更具体） */
.view-buttons .view-toggle{display:none}
.stage-fullscreen{border:1px solid #2b1a0720!important;background:var(--orange)!important;color:var(--ink)!important;box-shadow:2px 2px 0 #2b1a0733}
.stage-fullscreen[aria-pressed=true]{background:var(--ink)!important;color:#fff9f0!important}
.stage-guide{position:absolute;z-index:2;bottom:4px;left:0;right:0;text-align:center;font-size:11px;color:#a09583;pointer-events:none}
@media(hover:hover){.touch-guide{display:none}}
@media(hover:none){.desktop-guide{display:none}}

/* ---------- spec strip ---------- */
.spec-strip{display:grid;grid-template-columns:repeat(3,1fr);padding:22px 0;border-bottom:1px dashed #cdbfae}
.spec-strip div{padding-left:16px;border-left:2px solid #f0e8dc}
.spec-strip div:first-child{padding-left:0;border-left:0}
.spec-strip span{font-size:12px;color:var(--muted)}
.spec-strip strong{display:block;font-size:22px;font-weight:700;margin-top:4px;font-variant-numeric:tabular-nums}
.spec-strip small{font-size:12px;font-weight:500;color:var(--muted);margin-left:2px}

.selection-info{display:flex;align-items:center;gap:12px;padding:18px 0 0}
.material-dot{width:34px;height:34px;border-radius:50%;border:2px solid #fff;box-shadow:0 0 0 1px var(--line);flex:none}
.selection-info strong{font-size:14px;font-weight:600}
.selection-info p{margin:2px 0 0;font-size:11px;color:var(--muted)}
.selection-info>span:last-child{margin-left:auto;font-size:12px;color:var(--muted);font-variant-numeric:tabular-nums}
.print-note{display:flex;gap:10px;margin-top:16px;padding:14px 16px;border-radius:14px;
  background:#f6efe4;border:1px solid var(--line);color:var(--soft);font-size:12px;line-height:1.6}
.print-note span{flex:none;width:18px;height:18px;border-radius:50%;background:#fff;border:1px solid var(--line);
  font-size:11px;display:flex;align-items:center;justify-content:center}
.print-note p{margin:0}

/* ---------- parameter workbench ---------- */
/* 整栏钉在视口里，内部自己滚：调参数时预览始终可见 */
.parameter-workbench{position:sticky;top:96px;display:flex;flex-direction:column;min-width:0;
  max-height:calc(100vh - 116px)}
.parameter-tabs{display:flex;gap:6px;padding:6px;border-radius:16px;background:#f5efe6;
  border:1px solid var(--line);margin-bottom:16px}
.parameter-tabs button{flex:1;border:0;background:none;border-radius:12px;padding:11px 4px;
  font-size:12.5px;font-weight:600;color:var(--soft)}
.parameter-tabs button[aria-selected=true]{background:#fff;color:var(--ink);box-shadow:0 2px 6px #0000000d}
.parameter-scroll{flex:1 1 auto;min-height:0;overflow-y:auto;overscroll-behavior:contain;
  padding-right:6px;margin-right:-6px;scrollbar-gutter:stable}
.parameter-scroll::-webkit-scrollbar{width:8px}
.parameter-scroll::-webkit-scrollbar-track{background:transparent}
.parameter-scroll::-webkit-scrollbar-thumb{background:#d9ccbb;border-radius:8px;border:2px solid transparent;background-clip:content-box}
.parameter-scroll::-webkit-scrollbar-thumb:hover{background:#c9b9a4;background-clip:content-box}
.parameter-panel{display:flex;flex-direction:column;gap:16px}
.parameter-panel[hidden]{display:none}
.card{background:var(--card);border:1px solid var(--line);border-radius:18px;padding:22px;box-shadow:0 3px 0 #f1eae1}
.section-head{display:flex;align-items:baseline;justify-content:space-between;margin-bottom:14px}
.section-head h2{font-size:16px;font-weight:650}
.section-head span{font-size:11px;color:var(--muted)}
.section-head .text-button{padding:0;font-size:12px}

/* shapes */
.shapes{display:grid;grid-template-columns:repeat(4,1fr);gap:8px}
.shapes button{display:flex;flex-direction:column;align-items:center;gap:6px;padding:8px 2px 9px;
  border:1px solid #e6d9c9;border-radius:10px;background:#f5efe6;color:var(--soft);font-size:11px;transition:.15s}
.shapes button:hover{transform:translateY(-2px)}
.shapes button.selected{border-color:var(--ink);background:#fff6ea;color:var(--ink);box-shadow:2px 2px 0 var(--orange)}
.shapes canvas{width:100%;height:auto;display:block}

/* colors */
.material-brand{margin:0 0 12px;font-size:12px;color:var(--muted)}
.colors{display:grid;grid-template-columns:repeat(4,1fr);gap:10px 8px}
.swatch{display:flex;flex-direction:column;align-items:center;gap:7px;border:0;background:none;padding:0;
  color:var(--soft);font-size:11px;text-align:center}
.swatch i{display:block;width:100%;aspect-ratio:1;max-width:46px;border-radius:50%;
  border:1px solid #00000012;box-shadow:inset 0 -3px 6px #00000010;transition:.15s}
.swatch span{line-height:1.2}
.swatch.selected i{box-shadow:0 0 0 3px #fff,0 0 0 5px var(--orange)}
.swatch.selected{color:var(--ink);font-weight:600}
.custom-picker{display:flex;align-items:center;gap:10px;margin-top:14px;padding:11px 13px;
  border:1px solid var(--line);border-radius:12px;background:#fff;cursor:pointer}
.custom-picker:hover{background:#fffaf2}
.color-wheel{width:26px;height:26px;border-radius:50%;background:conic-gradient(#ff5f5f,#ffd15f,#7fe07f,#5fb0ff,#c77fff,#ff5f5f);
  display:flex;align-items:center;justify-content:center;color:#fff;font-size:15px;font-weight:700;flex:none}
.custom-picker span:nth-child(2){flex:1;font-size:12.5px}
.custom-picker small{display:block;font-size:10.5px;color:var(--muted)}
.custom-picker input{width:1px;height:1px;opacity:0;position:absolute}
.chevron{color:var(--muted)}

/* inputs */
.slider-control{margin-top:16px}
.slider-control label{display:block;font-size:13px;font-weight:500}
.slider-control output{float:right;font-size:12px;color:var(--muted);font-variant-numeric:tabular-nums}
.slider-control input[type=range]{width:100%;margin-top:6px;accent-color:var(--orange);height:22px}
.slider-control input[type=range]:disabled{opacity:.35;cursor:not-allowed}
.slider-control.is-disabled label,.slider-control.is-disabled output{color:#b8ab99}
.inputs{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-top:16px}
.inputs.two{grid-template-columns:repeat(2,1fr)}
.inputs label{font-size:11px;color:var(--muted)}
.mm-field{position:relative;display:block;margin-top:6px}
.mm-field input{width:100%;padding:9px 30px 9px 11px;border:1px solid var(--line);border-radius:10px;
  background:#fff;font-size:14px;outline:none;font-variant-numeric:tabular-nums}
.mm-field input:focus{border-color:var(--orange);box-shadow:0 0 0 3px #ff6f1e1a}
.mm-field i{position:absolute;right:11px;top:50%;transform:translateY(-50%);font-style:normal;font-size:11px;color:var(--muted)}
details{margin-top:14px}
details summary{cursor:pointer;font-size:12px;color:var(--soft);list-style:none}
details summary::-webkit-details-marker{display:none}
details summary::before{content:"＋ ";color:var(--orange)}
details[open] summary::before{content:"－ "}
.hint{margin:12px 0 0;font-size:11px;color:var(--muted);line-height:1.6}
.field-label{display:block;margin:16px 0 8px;font-size:12px;font-weight:600;color:var(--soft)}
.field-note{font-weight:400;color:var(--muted)}
.text-button{border:0;background:none;color:var(--orange-deep);font-size:12.5px;padding:6px 0;text-decoration:none}
.text-button:hover{text-decoration:underline}

/* support info */
.support-info{margin-top:18px;padding:15px;border-radius:14px;background:#f6efe4;border:1px solid var(--line)}
.support-header{display:flex;align-items:center;justify-content:space-between}
.support-info strong{font-size:13px}
.support-info span{display:block;margin-top:6px;font-size:12px;color:var(--soft)}
.support-info p{margin:6px 0 0;font-size:11px;color:var(--muted);line-height:1.6}
.support-toggle{position:relative;width:46px;height:26px;border-radius:100px;background:#dcd2c2;
  border:1px solid #cfc4b2;transition:.2s;flex:none}
.support-toggle i{position:absolute;top:2px;left:2px;width:20px;height:20px;border-radius:50%;
  background:#fff;transition:.2s;box-shadow:0 1px 3px #0003}
.support-toggle span{position:absolute;right:7px;top:5px;font-size:9px;font-weight:700;color:#fff9f0;margin:0!important}
.support-toggle[aria-checked=true]{background:var(--orange);border-color:var(--orange-deep)}
.support-toggle[aria-checked=true] i{left:22px}
.support-toggle[aria-checked=true] span{right:auto;left:8px}

/* engraving */
.name-wrap{position:relative}
.name-wrap input{width:100%;padding:13px 62px 13px 14px;border:1px solid var(--line);border-radius:12px;
  background:#fff;font-size:17px;outline:none}
.name-wrap input:focus{border-color:var(--orange);box-shadow:0 0 0 3px #ff6f1e1a}
.name-wrap span{position:absolute;right:12px;top:50%;transform:translateY(-50%);font-size:11px;color:var(--muted)}
.segmented{display:flex;gap:4px;padding:4px;margin-top:12px;border-radius:12px;background:#f5efe6;border:1px solid var(--line)}
.segmented button{flex:1;border:0;background:none;border-radius:9px;padding:9px 4px;font-size:12.5px;color:var(--soft)}
.segmented button[aria-pressed=true]{background:#fff;color:var(--ink);font-weight:600;box-shadow:0 2px 6px #0000000d}
.fonts{display:grid;grid-template-columns:repeat(4,1fr);gap:8px}
.fonts button{display:flex;flex-direction:column;align-items:center;gap:4px;padding:9px 2px 8px;
  border:1px solid #e6d9c9;border-radius:10px;background:#f5efe6;color:var(--soft)}
.fonts b{font-size:21px;line-height:1.1}
.fonts small{font-size:10px}
.fonts button.selected{border-color:var(--ink);background:#fff6ea;color:var(--ink);box-shadow:2px 2px 0 var(--orange)}
.decorations{display:grid;grid-template-columns:repeat(3,1fr);gap:8px}
.decorations button{display:flex;flex-direction:column;align-items:center;gap:5px;padding:8px 2px 7px;
  border:1px solid #e6d9c9;border-radius:10px;background:#f5efe6;color:var(--soft);font-size:11px}
.decorations canvas{width:100%;height:auto;display:block}
.decorations button[aria-pressed=true]{border-color:var(--ink);background:#fff6ea;color:var(--ink);box-shadow:2px 2px 0 var(--orange)}
.decoration-position{margin-top:8px}
.decoration-controls{margin-top:4px}

/* export */
.export-area{margin-top:14px;padding-top:14px;border-top:1px dashed #cdbfae}
.primary{width:100%;display:flex;justify-content:space-between;align-items:center;
  border:1.5px solid var(--ink);border-radius:12px;background:var(--orange);color:var(--ink);
  font-size:16px;font-weight:600;padding:15px 20px;box-shadow:3px 4px 0 var(--ink);transition:.12s}
.primary:hover{filter:brightness(1.04)}
.primary:active{transform:translate(3px,4px);box-shadow:0 0 0 var(--ink)}
.primary span{font-size:13px;opacity:.75}
.share-export{display:block;margin:12px auto 0}
.export-area p{margin:10px 0 0;text-align:center;font-size:11px;color:var(--muted);line-height:1.6}
/* 矮窗口下省掉底部说明，把高度让给参数区（说明文字是静态的，不承载操作反馈） */
@media(max-height:720px){
  #exportStatus{display:none}
  .export-area .share-export{margin-top:8px}
}
#error:not(:empty){color:#c0392b;background:#fdecea;border:1px solid #f5c6c2;border-radius:10px;padding:9px 12px}

footer{padding:26px 4% 40px;color:var(--muted);font-size:12px;text-align:center}
footer span{margin-left:8px;opacity:.7}

/* toast */
#toast{position:fixed;left:50%;bottom:34px;transform:translate(-50%,20px);opacity:0;pointer-events:none;
  background:var(--ink);color:#fff9f0;font-size:13px;padding:11px 20px;border-radius:100px;transition:.25s;z-index:60}
#toast.show{opacity:1;transform:translate(-50%,0)}

/* share sheet */
.share-sheet{position:fixed;inset:0;z-index:70;display:flex;align-items:center;justify-content:center;
  background:#2b1a0755;backdrop-filter:blur(4px);padding:20px}
.share-sheet[hidden]{display:none}
.share-card{width:min(440px,100%);background:var(--card);border:1px solid var(--line);border-radius:20px;
  padding:24px;box-shadow:0 20px 60px #00000030}
.share-card h2{font-size:18px;margin-bottom:8px}
.share-card>p{font-size:12.5px;color:var(--muted);margin:0 0 16px}
.share-card textarea{width:100%;padding:10px 12px;border:1px solid var(--line);border-radius:10px;
  background:#fff;font-size:12px;resize:vertical;outline:none;font-family:ui-monospace,SFMono-Regular,Menlo,monospace}
.share-card .hint{margin:12px 0 0}
.share-card textarea{display:block;max-height:96px;overflow:auto;resize:none}
.share-actions{display:flex;justify-content:flex-end;gap:8px;margin-top:16px}
.share-actions .text-button{border:1px solid var(--line);border-radius:10px;padding:9px 16px;background:#fff}
.share-actions #closeShare{background:var(--ink);color:#fff9f0;border-color:var(--ink)}

/* ---------- parameter sheet handle ---------- */
/* 把手只在移动端抽屉里出现 */
.sheet-handle{display:none}

/* ---------- responsive ---------- */
@media(max-width:1180px){
  main{grid-template-columns:minmax(0,1fr) 380px;gap:22px}
  .parameter-workbench{top:88px}
}
@media(max-width:960px){
  header{height:auto;min-height:64px;flex-wrap:wrap;gap:10px;padding:10px 4%;position:static}
  .header-title{border-left:0;padding-left:0}
  .header-share{order:3;flex:1 1 100%}
  .header-share input{width:100%}
  .version{display:none}
  main{grid-template-columns:1fr;gap:20px;padding:20px 4% 40px}
  .workspace-heading h1{font-size:23px}
  .stage{height:52vh;min-height:300px}
  .shapes,.colors,.fonts{grid-template-columns:repeat(4,1fr)}
  .inputs{grid-template-columns:repeat(3,1fr)}
}
@media(max-width:520px){
  .shapes{grid-template-columns:repeat(3,1fr)}
  .colors{grid-template-columns:repeat(3,1fr)}
  .fonts{grid-template-columns:repeat(2,1fr)}
  .inputs{grid-template-columns:repeat(2,1fr)}
  .inputs.two{grid-template-columns:repeat(2,1fr)}
  .spec-strip strong{font-size:18px}
  .view-buttons button{font-size:11px;padding:8px 10px}
  .workspace-heading{align-items:flex-start;flex-direction:column;gap:8px}
}

/* 移动端：参数工作台变成可拖动/点击调高的底部抽屉，预览始终留在上方 */
@media(max-width:960px){
  body{--sheet-h:168px}
  main{padding-bottom:190px}
  .parameter-workbench{
    position:fixed;top:auto;left:0;right:0;bottom:0;z-index:50;
    height:var(--sheet-h);max-height:calc(100dvh - 8px);
    padding:0 16px calc(env(safe-area-inset-bottom,0px) + 12px);
    background:var(--paper);border-top:1px solid var(--line);
    border-radius:22px 22px 0 0;box-shadow:0 -10px 34px #2b1a071a;
    transition:height .28s cubic-bezier(.22,1,.36,1);overflow:hidden;
  }
  .parameter-workbench.is-dragging{transition:none}
  .sheet-handle{
    display:flex;align-items:center;justify-content:center;flex:none;
    height:28px;margin:0 -16px;touch-action:none;cursor:grab;
    -webkit-tap-highlight-color:transparent;
  }
  .sheet-handle:active{cursor:grabbing}
  .sheet-handle:focus-visible{outline:2px solid var(--orange);outline-offset:-6px;border-radius:22px}
  .sheet-handle i{width:44px;height:5px;border-radius:99px;background:#cfc0ad;transition:background .2s}
  .sheet-handle[aria-expanded=true] i{background:var(--orange)}
  .parameter-tabs{flex:none;padding:4px;gap:4px;border-radius:14px;margin:0 0 10px}
  .parameter-tabs button{padding:8px 4px;font-size:12px;border-radius:10px}
  /* 抽屉内滚动条收进内容区，别浮在圆角边上 */
  .parameter-scroll{overflow-y:auto;-webkit-overflow-scrolling:touch;overscroll-behavior:contain;
    margin-right:0;padding-right:0;scrollbar-gutter:auto}
  .parameter-panel{padding-bottom:6px}
  /* 导出区已移入滚动内容，作为表单最后一步 */
  .export-area{margin:18px 0 6px}
  /* 舞台左上角信息在手机上收一号，把空间还给模型 */
  .stage-top{left:14px;right:14px;top:14px}
  .stage-top strong{font-size:13px}
  .stage-top span{font-size:10.5px;margin-top:2px}
  /* 视角工具条默认折叠成一枚「视角」胶囊，点开再展开 */
  .view-buttons{flex-wrap:wrap;justify-content:center;row-gap:2px;border-radius:18px}
  .view-buttons .view-toggle{display:inline-flex;align-items:center;gap:4px;border:0;border-radius:20px;
    background:#fff;color:var(--ink);font-size:11px;font-weight:600;padding:9px 13px;
    box-shadow:0 2px 7px #0000000f;-webkit-tap-highlight-color:transparent}
  .view-toggle i{font-style:normal;font-size:9px;line-height:1;color:var(--muted);transition:transform .2s}
  .view-buttons.is-open .view-toggle i{transform:rotate(180deg)}
  .view-buttons:not(.is-open)>button:not(.view-toggle){display:none}
}
@media(max-width:520px){
  .parameter-workbench{padding-left:12px;padding-right:12px}
  .sheet-handle{margin:0 -12px}
}
@media(prefers-reduced-motion:reduce){
  .parameter-workbench{transition:none}
}