:root{
    --bg:#0f1115; --panel:#171a21; --panel-2:#1e222b; --border:#2a2f3a;
    --text:#e6e8ee; --muted:#9aa3b2; --accent:#4f8cff; --accent-2:#3a6fd6;
    --danger:#ff5c5c; --ok:#3ecf8e; --radius:12px;
  }
  *{box-sizing:border-box;}
  html,body{margin:0;height:100%;}
  body{
    font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;
    background:var(--bg); color:var(--text); display:flex; flex-direction:column; height:100vh; overflow:hidden;
  }
  header{
    padding:12px 20px; border-bottom:1px solid var(--border); background:var(--panel);
    display:flex; align-items:center; gap:14px; flex-shrink:0;
  }
  header h1{font-size:17px; margin:0; font-weight:600; letter-spacing:.5px;}
  header .tag{font-size:12px; color:var(--muted); background:var(--panel-2); padding:3px 9px; border-radius:999px;}
  header .spacer{flex:1;}
  .main{display:flex; flex:1; min-height:0;}
  .sidebar{
    width:288px; flex-shrink:0; background:var(--panel); border-right:1px solid var(--border);
    overflow-y:auto; padding:16px; display:flex; flex-direction:column; gap:18px;
  }
  .stage{
    flex:1; min-width:0; display:flex; align-items:safe center; justify-content:safe center;
    background:
      linear-gradient(45deg,#1a1d24 25%,transparent 25%),
      linear-gradient(-45deg,#1a1d24 25%,transparent 25%),
      linear-gradient(45deg,transparent 75%,#1a1d24 75%),
      linear-gradient(-45deg,transparent 75%,#1a1d24 75%);
    background-size:24px 24px; background-position:0 0,0 12px,12px -12px,-12px 0;
    background-color:#13161c; overflow:auto; padding:24px; position:relative;
  }
  .stage.panning{cursor:grabbing;}
  .stage.pan-mode{cursor:grab;}
  .canvas-wrap{position:relative; line-height:0; box-shadow:0 8px 40px rgba(0,0,0,.5); flex-shrink:0;}
  .canvas-wrap canvas{display:block; width:100%; height:100%; touch-action:none;}
  #overlay{position:absolute; top:0; left:0; pointer-events:none;}
  .zoom-bar{
    position:absolute; bottom:16px; right:16px; display:none; gap:2px;
    background:rgba(23,26,33,0.92); border:1px solid var(--border); border-radius:10px;
    padding:4px; backdrop-filter:blur(8px); z-index:15; align-items:center;
    box-shadow:0 6px 20px rgba(0,0,0,.4);
  }
  .zoom-bar.show{display:flex;}
  .zoom-bar button{
    background:transparent; border:none; color:var(--text); padding:6px 11px; cursor:pointer;
    border-radius:6px; font-size:14px; line-height:1; font-family:inherit;
  }
  .zoom-bar button:hover{background:var(--panel-2);}
  .zoom-bar .zoom-label{
    min-width:54px; text-align:center; color:var(--muted); font-size:12px; padding:0 6px;
    font-variant-numeric:tabular-nums; user-select:none;
  }
  .zoom-bar .sep{width:1px; height:18px; background:var(--border); margin:0 2px;}
  .drop-hint{
    text-align:center; color:var(--muted); border:2px dashed var(--border); border-radius:16px;
    padding:60px 50px; max-width:520px; transition:.2s;
  }
  .drop-hint.drag{border-color:var(--accent); background:rgba(79,140,255,.08); color:var(--text);}
  .drop-hint .big{font-size:46px; margin-bottom:14px;}
  .drop-hint h2{margin:0 0 8px; font-size:18px; font-weight:600;}
  .drop-hint p{margin:6px 0; font-size:13px;}
  .section-title{font-size:12px; color:var(--muted); text-transform:uppercase; letter-spacing:1px; margin:0 0 2px;}
  .tools{display:grid; grid-template-columns:1fr 1fr; gap:8px;}
  .tool-btn{
    display:flex; flex-direction:column; align-items:center; gap:6px; padding:11px 6px;
    background:var(--panel-2); border:1px solid var(--border); border-radius:10px; color:var(--text);
    cursor:pointer; font-size:12px; transition:.15s; text-align:center;
  }
  .tool-btn:hover{border-color:var(--accent-2);}
  .tool-btn.active{border-color:var(--accent); background:rgba(79,140,255,.14); color:#fff;}
  .tool-btn .ic{font-size:20px;}
  .tool-btn .desc{font-size:10px; color:var(--muted); line-height:1.3;}
  .tool-btn.active .desc{color:#c5d4f5;}
  .field{display:flex; flex-direction:column; gap:7px;}
  .field label{font-size:13px; color:var(--text); display:flex; justify-content:space-between; align-items:center;}
  .field label .val{color:var(--accent); font-variant-numeric:tabular-nums;}
  input[type=range]{width:100%; accent-color:var(--accent);}
  input[type=color]{width:100%; height:34px; padding:0; border:1px solid var(--border); border-radius:8px; background:var(--panel-2); cursor:pointer;}
  input[type=number]{
    width:100%; min-width:0; height:36px; padding:0 9px; color:var(--text); background:var(--panel);
    border:1px solid var(--border); border-radius:8px; font:inherit; font-size:12px; outline:none;
  }
  input[type=number]:focus{border-color:var(--accent);}
  .btn{
    border:1px solid var(--border); background:var(--panel-2); color:var(--text); padding:10px 12px;
    border-radius:9px; cursor:pointer; font-size:13px; transition:.15s; display:inline-flex;
    align-items:center; justify-content:center; gap:6px; width:100%;
  }
  .btn:hover{border-color:var(--accent-2);}
  .btn:disabled{opacity:.4; cursor:not-allowed;}
  .btn.primary{background:var(--accent); border-color:var(--accent); color:#fff; font-weight:600;}
  .btn.primary:hover{background:var(--accent-2);}
  .btn.ghost{background:transparent;}
  .row{display:flex; gap:8px;}
  .row .btn{width:auto; flex:1;}
  .opts{background:var(--panel-2); border:1px solid var(--border); border-radius:10px; padding:13px; display:flex; flex-direction:column; gap:13px;}
  .opts .hint{font-size:12px; color:var(--muted); line-height:1.5;}
  .seg{display:flex; gap:6px;}
  .seg-btn{flex:1; padding:9px 6px; background:var(--panel); border:1px solid var(--border); border-radius:9px; color:var(--muted); cursor:pointer; font-size:13px; font-family:inherit; transition:.15s;}
  .seg-btn:hover{border-color:var(--accent-2);}
  .seg-btn.active{border-color:var(--accent); background:rgba(79,140,255,.16); color:#fff; font-weight:600;}
  .crop-presets{display:grid; grid-template-columns:repeat(3,1fr); gap:6px;}
  .crop-size-row{display:grid; grid-template-columns:1fr auto 1fr; gap:7px; align-items:center;}
  .crop-size-row span{color:var(--muted); font-size:12px;}
  .crop-status{font-size:12px; color:var(--accent); text-align:center; font-variant-numeric:tabular-nums;}
  .divider{height:1px; background:var(--border); margin:2px 0;}
  .toast{
    position:fixed; left:50%; bottom:28px; transform:translateX(-50%) translateY(20px);
    background:#222732; color:#fff; padding:11px 18px; border-radius:10px; font-size:13px;
    box-shadow:0 8px 30px rgba(0,0,0,.4); opacity:0; pointer-events:none; transition:.25s; z-index:50;
    border:1px solid var(--border);
  }
  .toast.show{opacity:1; transform:translateX(-50%) translateY(0);}
  .busy{
    position:absolute; inset:0; background:rgba(15,17,21,.6); display:none; align-items:center;
    justify-content:center; flex-direction:column; gap:14px; z-index:20; backdrop-filter:blur(2px);
  }
  .busy.show{display:flex;}
  .spinner{width:38px; height:38px; border:3px solid var(--border); border-top-color:var(--accent); border-radius:50%; animation:spin .8s linear infinite;}
  @keyframes spin{to{transform:rotate(360deg);}}
  .footnote{font-size:11px; color:var(--muted); line-height:1.6; margin-top:auto;}
  .site-footer{
    flex-shrink:0; font-size:11.5px; color:var(--muted);
    background:var(--panel); border-top:1px solid var(--border);
    padding:7px 16px; line-height:1.6;
  }
  .site-footer-inner{max-width:1120px; margin:0 auto; display:flex; align-items:center; justify-content:center; gap:24px;}
  .site-footer-copy{text-align:center;}
  .site-footer b{color:var(--text); font-weight:600;}
  .site-footer .sep{margin:0 8px; opacity:.5;}
  .site-footer .copyright-notice{display:block; margin-top:2px;}
  .footer-links{display:flex; flex-wrap:wrap; justify-content:center; align-items:center; gap:0 14px; margin:4px 0;}
  .footer-links a{color:var(--muted); text-decoration:none; padding:3px 0; white-space:nowrap;}
  .footer-links a:hover{color:var(--text); text-decoration:underline; text-underline-offset:3px;}
  .footer-links a:focus-visible{outline:2px solid var(--accent); outline-offset:3px; border-radius:2px;}
  .footer-follow{display:flex; align-items:center; gap:9px; flex-shrink:0; padding:5px 10px 5px 5px; border:1px solid var(--border); border-radius:10px; background:var(--panel-2); color:var(--text); font:inherit; text-align:left; cursor:pointer; transition:border-color .15s,background .15s;}
  .footer-follow:hover,.footer-follow:focus-visible{border-color:var(--accent); background:#252b38; outline:none;}
  .footer-follow img{display:block; width:58px; height:58px; border-radius:6px; background:#fff;}
  .footer-follow strong,.footer-follow small{display:block; white-space:nowrap;}
  .footer-follow strong{font-size:11.5px; font-weight:600;}
  .footer-follow small{margin-top:2px; font-size:10.5px; color:var(--muted);}
  kbd{background:var(--panel-2); border:1px solid var(--border); border-bottom-width:2px; border-radius:5px; padding:1px 6px; font-size:11px; font-family:inherit;}
  ::-webkit-scrollbar{width:10px; height:10px;}
  ::-webkit-scrollbar-thumb{background:#2c313c; border-radius:5px;}
  ::-webkit-scrollbar-track{background:transparent;}
  .modal{position:fixed; inset:0; background:rgba(0,0,0,.6); display:none; align-items:center; justify-content:center; z-index:100; padding:24px; backdrop-filter:blur(3px);}
  .modal.show{display:flex;}
  .modal-box{background:var(--panel); border:1px solid var(--border); border-radius:16px; max-width:680px; width:100%; max-height:86vh; overflow-y:auto; box-shadow:0 20px 70px rgba(0,0,0,.5);}
  .modal-head{display:flex; align-items:center; justify-content:space-between; padding:18px 24px; border-bottom:1px solid var(--border); position:sticky; top:0; background:var(--panel); z-index:1;}
  .modal-head h2{margin:0; font-size:17px;}
  .modal-close{background:none; border:none; color:var(--muted); font-size:24px; cursor:pointer; line-height:1; padding:0 4px;}
  .modal-close:hover{color:var(--text);}
  .modal-body{padding:20px 24px 28px;}
  .modal-body h3{font-size:14px; margin:22px 0 8px; color:var(--accent); display:flex; align-items:center; gap:8px;}
  .modal-body h3:first-child{margin-top:0;}
  .modal-body p, .modal-body li{font-size:13.5px; line-height:1.75; color:var(--text); margin:6px 0;}
  .modal-body ul{margin:6px 0; padding-left:22px;}
  .modal-body .note{background:var(--panel-2); border:1px solid var(--border); border-left:3px solid var(--accent); border-radius:8px; padding:12px 14px; font-size:13px; color:var(--muted); line-height:1.7;}
  .modal-body .tool-row{display:flex; gap:10px; padding:10px 0; border-bottom:1px solid var(--border);}
  .modal-body .tool-row:last-child{border-bottom:none;}
  .modal-body .tool-row .ti{font-size:22px; flex-shrink:0; width:30px; text-align:center;}
  .modal-body .tool-row .tc b{color:var(--text);}
  .modal-body .tool-row .tc{font-size:13px; color:var(--muted); line-height:1.65;}
  .share-platform-field{display:flex; align-items:center; justify-content:center; gap:10px; margin-top:16px; color:var(--muted); font-size:13px;}
  .share-platform-field select{font:inherit; color:var(--text); background:var(--panel-2); border:1px solid var(--border); border-radius:8px; padding:7px 28px 7px 10px; cursor:pointer;}
  .share-grid{display:grid; grid-template-columns:repeat(2,minmax(0,1fr)); gap:12px; margin-top:17px;}
  .share-qr-card{min-width:0; padding:16px 12px 17px; border:1px solid var(--border); border-radius:12px; background:var(--panel-2);}
  .share-qr-card h3{display:block; margin:0 0 4px; color:var(--text); font-size:14px;}
  .share-qr-card p{margin:0 0 12px; color:var(--muted); font-size:12px;}
  .share-qr-card img{display:block; max-width:100%; margin:0 auto;}
  .share-link-row{display:flex; gap:8px; margin-top:17px;}
  .share-link-row input{flex:1; min-width:0; background:var(--panel-2); border:1px solid var(--border); border-radius:8px; color:var(--text); padding:9px 11px; font-size:12px;}
  .share-link-row .btn{width:auto; padding:9px 14px;}
  .follow-intro{margin:0 auto 23px; text-align:center; color:var(--muted); font-size:13px; line-height:1.75; white-space:nowrap;}
  .follow-card{max-width:284px; margin:0 auto; background:var(--panel-2); border:1px solid var(--border); border-radius:13px; padding:19px 16px 17px; text-align:center;}
  .follow-card h3{display:block; margin:0 0 7px; color:var(--text); font-size:14px;}
  .follow-card p{margin:0 0 15px; color:var(--muted); font-size:12px; line-height:1.55;}
  .follow-qr{display:block; width:min(100%,220px); aspect-ratio:1; margin:0 auto; border-radius:11px; object-fit:cover; background:#fff;}
  .follow-note{text-align:center; color:var(--muted); font-size:11.5px; line-height:1.8; margin:22px 0 0;}
  #followModal .modal-body{padding:24px 24px 31px;}
  @media (max-width:780px){
    .main{flex-direction:column;}
    .sidebar{width:100%; max-height:46%; border-right:none; border-bottom:1px solid var(--border); padding:14px; gap:14px;}

    /* 顶部栏：标题/标签在上，4 个操作按钮自动换行平铺成 2×2 大方块，便于触屏点击 */
    header{padding:10px 14px; gap:8px; flex-wrap:wrap;}
    header h1{font-size:16px;}
    header .tag{font-size:11px; padding:3px 8px;}
    header .btn{flex:1 1 40%; width:auto; min-width:0; padding:10px 6px; font-size:13px; white-space:nowrap;}

    .stage{padding:14px;}
    .drop-hint{padding:42px 26px;}
    .drop-hint .big{font-size:40px;}
    .site-footer{font-size:10.5px; padding:6px 10px;}
    .site-footer-inner{gap:10px;}
    .site-footer-copy{flex:1;}
    .site-footer .sep{margin:0 5px;}
    .footer-follow{padding:3px;}
    .footer-follow img{width:48px; height:48px;}
    .footer-follow span{display:none;}
    .follow-intro{margin-bottom:18px; white-space:normal;}
    .follow-card{padding:14px 11px;}
    .follow-card h3{font-size:13px;}
    .follow-card p{font-size:11px; margin-bottom:11px;}
    .follow-note{margin-top:18px;}
    #followModal .modal-body{padding:20px 14px 25px;}
  }
  @media (max-width:460px){
    header h1{font-size:15px; letter-spacing:0;}
    header .tag{font-size:10.5px; padding:2px 7px;}
    header .btn{font-size:12.5px; padding:10px 4px; gap:4px;}
    .tool-btn{padding:10px 4px;}
    .tool-btn .ic{font-size:19px;}
    .share-grid{grid-template-columns:1fr;}
    .share-qr-card{padding:13px 12px;}
  }