*,*::before,*::after{box-sizing:border-box}
:root{
  --bg:#f4f5f7;--panel:#fff;--panel2:#fafbfc;--line:#e4e6ea;--line2:#d3d6db;
  --txt:#1c1f23;--dim:#6b7280;--dim2:#9aa1ab;
  --pri:#2563eb;--pri2:#1e4fd8;--ok:#15803d;--err:#dc2626;--warn:#b45309;
  --chip:#eceef1;
  --r:10px;--rl:14px;
  --mono:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
}
@media (prefers-color-scheme:dark){:root{
  --bg:#15171b;--panel:#1c2026;--panel2:#212630;--line:#2c3138;--line2:#3a414a;
  --txt:#e7e9ec;--dim:#98a0aa;--dim2:#6f7780;
  --pri:#3b82f6;--pri2:#5b9bff;--ok:#4ade80;--err:#f87171;--warn:#fbbf24;
  --chip:#262b32;
}}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;background:var(--bg);color:var(--txt);
  font:15px/1.65 system-ui,-apple-system,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  overflow-wrap:break-word;
}
h1,h2,h3{margin:0;font-weight:600;line-height:1.35}
p{margin:0}
b{font-weight:600}
a{color:var(--pri);text-decoration:none}
a:hover{text-decoration:underline}
.dim{color:var(--dim)}

/* ---------- 顶栏 ---------- */
.hd{background:var(--panel);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:20}
.hd-in{max-width:1180px;margin:0 auto;padding:12px 16px;display:flex;align-items:center;gap:12px}
.brand{display:flex;align-items:center;gap:11px;min-width:0}
.logo{
  width:36px;height:36px;flex:0 0 36px;border-radius:10px;background:var(--pri);color:#fff;
  display:flex;align-items:center;justify-content:center;font-size:17px;font-weight:600
}
.brand-t{min-width:0}
.brand-t h1{font-size:16px;letter-spacing:.2px}
.brand-t p{font-size:12px;color:var(--dim);margin-top:1px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
/* 手机端用下拉选工具，桌面隐藏 */
.nav-sel{display:none}

/* ---------- 布局 ---------- */
.main{
  max-width:1180px;margin:0 auto;padding:20px 16px 48px;
  display:grid;grid-template-columns:212px minmax(0,1fr);gap:22px;align-items:start
}
.nav{position:sticky;top:76px;max-height:calc(100vh - 100px);overflow-y:auto;padding-right:2px}
.nav-g{margin-bottom:16px}
.nav-g-t{
  font-size:11.5px;font-weight:600;color:var(--dim2);letter-spacing:.6px;
  padding:0 10px 6px;text-transform:none
}
.nav-i{
  display:flex;align-items:center;gap:9px;width:100%;text-align:left;
  background:none;border:0;color:var(--txt);font:inherit;font-size:14px;
  padding:8px 10px;border-radius:8px;cursor:pointer;line-height:1.4
}
.nav-i:hover{background:var(--chip)}
.nav-i.on{background:var(--pri);color:#fff}
.nav-i .dot{width:6px;height:6px;border-radius:50%;background:var(--dim2);flex:0 0 6px}
.nav-i.on .dot{background:#fff}
.pane{min-width:0}

/* ---------- 工具卡片 ---------- */
.tool-hd{margin-bottom:18px}
.tool-hd h2{font-size:19px}
.tool-hd p{color:var(--dim);font-size:13.5px;margin-top:5px}
.card{
  background:var(--panel);border:1px solid var(--line);border-radius:var(--rl);
  padding:16px;margin-bottom:14px
}
.card-t{font-size:13.5px;font-weight:600;color:var(--dim);margin-bottom:12px;letter-spacing:.3px}

/* ---------- 投放区 ---------- */
.drop{
  border:1.5px dashed var(--line2);border-radius:var(--rl);background:var(--panel2);
  padding:30px 18px;text-align:center;cursor:pointer;transition:border-color .15s,background .15s
}
.drop:hover{border-color:var(--pri)}
.drop.over{border-color:var(--pri);background:color-mix(in srgb,var(--pri) 8%,var(--panel2))}
.drop-i{font-size:26px;line-height:1;color:var(--dim2);margin-bottom:10px}
.drop-t{font-size:14.5px;font-weight:500}
.drop-s{font-size:12.5px;color:var(--dim);margin-top:5px;line-height:1.6}

/* ---------- 表单 ---------- */
.row{display:flex;flex-wrap:wrap;gap:12px 18px;align-items:flex-end}
.fld{display:flex;flex-direction:column;gap:6px;min-width:0}
.fld>label{font-size:12.5px;color:var(--dim);font-weight:500}
.fld .val{font-variant-numeric:tabular-nums;color:var(--txt);font-weight:600;font-size:12.5px}
input[type=text],input[type=number],select,textarea{
  background:var(--panel);border:1px solid var(--line2);border-radius:8px;color:var(--txt);
  font:inherit;font-size:13.5px;padding:7px 10px;width:100%;min-width:88px
}
textarea{resize:vertical;min-height:96px;line-height:1.6;font-family:var(--mono);font-size:13px}
input[type=range]{width:100%;min-width:140px;accent-color:var(--pri);margin:0}
input[type=color]{
  width:44px;height:34px;padding:2px;border:1px solid var(--line2);border-radius:8px;
  background:var(--panel);cursor:pointer
}
input[type=checkbox]{accent-color:var(--pri);width:15px;height:15px;margin:0}
.chk{display:flex;align-items:center;gap:7px;font-size:13.5px;cursor:pointer;user-select:none}
.sl{display:flex;align-items:center;gap:10px}
.sl>input[type=range]{flex:1}
.sl>.val{flex:0 0 auto;min-width:44px;text-align:right}

/* ---------- 按钮 ---------- */
.btn{
  background:var(--pri);color:#fff;border:0;border-radius:9px;padding:9px 18px;
  font:inherit;font-size:14px;font-weight:500;cursor:pointer;white-space:nowrap
}
.btn:hover{background:var(--pri2)}
.btn:disabled{opacity:.45;cursor:default}
.btn.sec{background:var(--chip);color:var(--txt);border:1px solid var(--line2)}
.btn.sec:hover{background:var(--line)}
.btn.sm{padding:6px 12px;font-size:13px}
.acts{display:flex;flex-wrap:wrap;gap:10px;margin-top:16px;align-items:center}

/* ---------- 图片预览 ---------- */
.pv{
  background:
    linear-gradient(45deg,#e9ebee 25%,transparent 25%,transparent 75%,#e9ebee 75%),
    linear-gradient(45deg,#e9ebee 25%,transparent 25%,transparent 75%,#e9ebee 75%);
  background-size:16px 16px;background-position:0 0,8px 8px;
  border:1px solid var(--line);border-radius:var(--r);
  padding:10px;display:flex;align-items:center;justify-content:center;min-height:90px
}
@media (prefers-color-scheme:dark){.pv{
  background:
    linear-gradient(45deg,#2a2f37 25%,transparent 25%,transparent 75%,#2a2f37 75%),
    linear-gradient(45deg,#2a2f37 25%,transparent 25%,transparent 75%,#2a2f37 75%);
  background-size:16px 16px;background-position:0 0,8px 8px
}}
.pv img,.pv canvas{max-width:100%;max-height:340px;display:block;border-radius:4px}
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.grid2 .card{margin:0}
.pv-lbl{font-size:12px;color:var(--dim);margin-bottom:7px;font-weight:500}

/* ---------- 缩略图列表（拼接/排序用）---------- */
.thumbs{display:flex;flex-wrap:wrap;gap:10px}
.thumb{
  position:relative;border:1px solid var(--line);border-radius:9px;overflow:hidden;
  background:var(--panel2);width:96px
}
.thumb img{width:100%;height:74px;object-fit:cover;display:block}
.thumb .th-f{font-size:11px;padding:3px 5px;color:var(--dim);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.thumb .th-x{
  position:absolute;top:3px;right:3px;width:20px;height:20px;border-radius:50%;
  background:rgba(0,0,0,.62);color:#fff;border:0;font-size:13px;line-height:1;cursor:pointer;
  display:flex;align-items:center;justify-content:center
}
.thumb .th-n{
  position:absolute;top:3px;left:3px;min-width:18px;height:18px;padding:0 5px;border-radius:9px;
  background:var(--pri);color:#fff;font-size:11px;display:flex;align-items:center;justify-content:center
}
.thumb .th-o{position:absolute;bottom:22px;left:3px;right:3px;display:flex;gap:3px}
.thumb .th-o button{
  flex:1;height:19px;border-radius:5px;border:0;background:rgba(0,0,0,.6);color:#fff;
  font-size:11px;cursor:pointer;line-height:1;padding:0
}

/* ---------- 提示 ---------- */
.note{
  border-radius:var(--r);padding:11px 13px;font-size:13px;line-height:1.65;margin-top:12px;
  background:var(--panel2);border:1px solid var(--line);color:var(--dim)
}
.note.warn{background:color-mix(in srgb,var(--warn) 12%,var(--panel));border-color:color-mix(in srgb,var(--warn) 35%,var(--line));color:var(--warn)}
.note.err{background:color-mix(in srgb,var(--err) 12%,var(--panel));border-color:color-mix(in srgb,var(--err) 35%,var(--line));color:var(--err)}
.note.ok{background:color-mix(in srgb,var(--ok) 12%,var(--panel));border-color:color-mix(in srgb,var(--ok) 35%,var(--line));color:var(--ok)}
.kv{display:flex;flex-wrap:wrap;gap:6px 18px;font-size:13px}
.kv i{font-style:normal;color:var(--dim)}
.kv b{font-variant-numeric:tabular-nums}

/* ---------- 页脚 ---------- */
.ft{
  max-width:1180px;margin:0 auto;width:100%;
  padding:4px 16px 44px;font-size:12.5px;line-height:1.75;color:var(--dim)
}
.ft p+p{margin-top:5px}
.ft b{color:var(--txt)}

/* ---------- 手机 ---------- */
@media (max-width:760px){
  .main{grid-template-columns:minmax(0,1fr);gap:16px;padding:14px 12px 36px}
  /* 手机上不给横滑条（看不出能滑），直接给下拉框，所有工具一次看全 */
  .nav{display:none}
  .nav-sel{
    display:block;width:100%;margin:0 0 14px;cursor:pointer;
    font-size:15.5px;font-weight:500;padding:12px 12px;border-radius:11px;
    background:var(--panel);color:var(--txt);border-color:var(--line2)
  }
  .grid2{grid-template-columns:minmax(0,1fr)}
  .pv img,.pv canvas{max-height:260px}
  .brand-t p{display:none}
  .btn{padding:10px 18px}
  .hd-in{padding:10px 12px}
  .ft{padding:4px 12px 36px}
}
@media (max-width:400px){
  .brand-t h1{font-size:15px}
}

/* ---------- 顶栏：返回首页 ---------- */
.hd-back{
  margin-left:auto;flex:0 0 auto;white-space:nowrap;
  font-size:13px;color:var(--dim);text-decoration:none;
  border:1px solid var(--line);border-radius:9px;padding:6px 12px;background:var(--panel);
  transition:.16s
}
.hd-back:hover{color:var(--pri);border-color:var(--line2);text-decoration:none;background:var(--panel2)}

/* ---------- 站内弹窗（替代浏览器原生 alert / confirm / prompt） ---------- */
.dlg-mask{
  position:fixed;inset:0;z-index:200;display:none;
  align-items:center;justify-content:center;padding:22px;
  background:rgba(20,24,34,.45);-webkit-backdrop-filter:blur(2px);backdrop-filter:blur(2px)
}
.dlg-mask.on{display:flex}
.dlg{
  width:100%;max-width:400px;background:var(--panel);color:var(--txt);
  border:1px solid var(--line);border-radius:var(--rl);padding:22px 22px 18px;
  box-shadow:0 22px 55px rgba(15,20,34,.3);animation:dlgIn .17s ease-out
}
@keyframes dlgIn{from{transform:translateY(10px) scale(.985);opacity:0}to{transform:none;opacity:1}}
.dlg-t{font-size:15.5px;font-weight:600;letter-spacing:.2px}
.dlg-t:not(:empty){margin-bottom:9px}
.dlg-m{font-size:13.5px;line-height:1.75;color:var(--dim);white-space:pre-wrap;word-break:break-word}
.dlg-i{
  display:block;width:100%;margin-top:13px;outline:none;font-family:inherit;
  font-size:14px;padding:9px 12px;border-radius:9px;
  border:1px solid var(--line2);background:var(--panel2);color:var(--txt)
}
.dlg-i:focus{border-color:var(--pri)}
.dlg-f{display:flex;justify-content:flex-end;gap:9px;margin-top:19px}
.dlg-b{
  font:inherit;font-size:13.5px;cursor:pointer;padding:8px 19px;border-radius:9px;
  border:1px solid var(--line);background:var(--panel);color:var(--dim);transition:.16s
}
.dlg-b:hover{border-color:var(--line2);color:var(--txt);background:var(--chip)}
.dlg-b.pri{background:var(--pri);border-color:transparent;color:#fff}
.dlg-b.pri:hover{background:var(--pri2);color:#fff}
.dlg-b.pri.danger{background:var(--err);border-color:transparent}
.dlg-b.pri.danger:hover{filter:brightness(1.08)}
.dlg-toast{
  position:fixed;left:50%;bottom:34px;z-index:210;
  transform:translate(-50%,18px);opacity:0;pointer-events:none;transition:.22s;
  max-width:88vw;text-align:center;font-size:13px;padding:10px 20px;border-radius:11px;
  background:rgba(22,26,36,.93);color:#fff
}
.dlg-toast.on{opacity:1;transform:translate(-50%,0)}

/* ---------- 签名去背：手动裁剪框 ---------- */
.cwrap{position:relative;display:inline-block;line-height:0;overflow:hidden;border-radius:4px;touch-action:none}
.cwrap>img{display:block;max-width:100%;max-height:300px}
.covl{position:absolute;inset:0;touch-action:none}
.cbox{
  position:absolute;box-sizing:border-box;
  border:1.5px solid #fff;box-shadow:0 0 0 1px rgba(0,0,0,.5),0 0 0 9999px rgba(10,14,22,.55);
  cursor:move;touch-action:none
}
.chd{
  position:absolute;width:20px;height:20px;border-radius:4px;background:#fff;
  box-shadow:0 0 0 1px rgba(0,0,0,.4);touch-action:none
}
.chd::after{content:'';position:absolute;inset:5px;border-radius:2px;background:var(--pri)}
.chd-nw{left:0;top:0;cursor:nwse-resize}
.chd-ne{right:0;top:0;cursor:nesw-resize}
.chd-sw{left:0;bottom:0;cursor:nesw-resize}
.chd-se{right:0;bottom:0;cursor:nwse-resize}
@media (max-width:560px){
  .chd{width:26px;height:26px}
  .chd::after{inset:7px}
}

/* ---------- 密码/随机串：等宽结果行 ---------- */
.mono{font-family:var(--mono);font-variant-numeric:tabular-nums}

/* ---------- 九宫格切图 ---------- */
.gcut-grid{display:flex;justify-content:center;padding:6px 0 2px}
.gcut-tg{display:grid;gap:3px;margin:0 auto}
.gcut-cell{position:relative;background:var(--panel2);border:1px solid var(--line);border-radius:5px;overflow:hidden;line-height:0}
.gcut-cell img{width:100%;height:100%;display:block;object-fit:cover}
.gcut-no{
  position:absolute;right:3px;bottom:3px;min-width:17px;height:17px;padding:0 4px;
  border-radius:9px;background:rgba(0,0,0,.6);color:#fff;font-size:11px;line-height:17px;
  text-align:center;font-weight:600;font-variant-numeric:tabular-nums
}
.gcut-out .gcut-dl{
  position:absolute;left:0;right:0;bottom:0;background:rgba(0,0,0,.62);color:#fff;
  font-size:11.5px;text-align:center;padding:3px 0;text-decoration:none;line-height:1.5
}
.gcut-out .gcut-dl:hover{background:var(--pri);text-decoration:none}

/* ---------- 去水印 / 涂抹 ---------- */
.er-wrap{
  position:relative;display:block;margin:0 auto;line-height:0;touch-action:none;
  border:1px solid var(--line);border-radius:8px;overflow:hidden;max-width:100%;
  background:var(--panel2)
}
.er-canvas{display:block;max-width:100%;cursor:crosshair;touch-action:none}
.er-ring{
  position:absolute;display:none;border:1.5px solid rgba(255,255,255,.9);
  border-radius:50%;pointer-events:none;transform:translate(-50%,-50%);
  box-shadow:0 0 0 1px rgba(0,0,0,.55),inset 0 0 0 1px rgba(0,0,0,.35)
}