:root{
  --bg:#f5f6f7; --card:#fff; --text:#1f2329; --muted:#9aa3af;
  --accent:#2fbfa4; --accent-2:#1fa38b; --border:#eef0f2; --radius:12px;
  --teal-bg:#e7f8f3;
}
*{box-sizing:border-box}
body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"PingFang SC","Microsoft YaHei",sans-serif;
  background:var(--bg);color:var(--text);line-height:1.6}
a{color:var(--accent);text-decoration:none}
.site-header{background:#fff;border-bottom:1px solid var(--border)}
.site-header .inner{max-width:1120px;margin:0 auto;height:80px;padding:0 24px;display:flex;align-items:center;justify-content:space-between}
.logo{font-size:17px;font-weight:700}
.logo span{color:var(--accent)}
.site-nav a{margin-left:20px;color:var(--muted);font-size:15px}
.container{max-width:1120px;margin:0 auto;padding:18px 20px 60px}
.hero{text-align:center;padding:20px 0 30px}
.hero h1{font-size:30px;margin:0 0 8px}
.hero p{color:var(--muted);margin:0}
.tool-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:16px;margin-top:24px}
.tool-card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:20px;transition:.2s}
.tool-card:hover{border-color:var(--accent);transform:translateY(-2px);box-shadow:0 6px 20px rgba(0,0,0,.06)}
.tool-card h3{margin:0 0 6px;font-size:16px}
.tool-card p{margin:0;color:var(--muted);font-size:13px}
.panel{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:24px;max-width:1080px;margin:0 auto}
.back-btn{display:inline-flex;align-items:center;gap:6px;margin-bottom:14px;color:var(--muted);font-size:14px;background:#fff;border:1px solid var(--border);border-radius:10px;padding:8px 14px;transition:.2s;cursor:pointer}
.back-btn:hover{color:var(--accent);border-color:var(--accent)}
.dropzone{border:2px dashed var(--border);border-radius:var(--radius);padding:36px 20px;text-align:center;cursor:pointer;color:var(--muted);transition:.2s}
.dropzone.drag{border-color:var(--accent);background:var(--teal-bg);color:var(--accent)}
.dropzone strong{color:var(--text)}
.row{display:flex;gap:12px;flex-wrap:wrap;align-items:center;margin-top:16px}
.field{display:flex;flex-direction:column;gap:6px;font-size:14px}
.field label{color:var(--muted);font-size:13px}
input[type=number],input[type=text],select{width:100%;padding:9px 10px;border:1px solid var(--border);border-radius:10px;font-size:14px;font-family:inherit}
.btn{background:var(--accent);color:#fff;border:none;border-radius:10px;padding:11px 20px;font-size:15px;cursor:pointer;transition:.2s}
.btn:hover{background:var(--accent-2)}
.btn:disabled{opacity:.5;cursor:not-allowed}
.btn.ghost{background:#fff;color:var(--accent);border:1px solid var(--accent)}
.btn.sm{padding:7px 12px;font-size:13px}
.preview{margin-top:18px;text-align:center}
.preview img{max-width:100%;border-radius:10px;border:1px solid var(--border)}
.status{margin-top:14px;font-size:14px;color:var(--muted);min-height:20px}
.status.ok{color:#059669}
.status.err{color:#dc2626}
.crop-stage{position:relative;display:inline-block;max-width:100%;user-select:none;touch-action:none}
.crop-stage img{max-width:100%;display:block}
.crop-box{position:absolute;border:1px solid #fff;box-shadow:0 0 0 9999px rgba(0,0,0,.45);cursor:move}
.crop-box:after{content:"";position:absolute;inset:0;outline:1px dashed rgba(255,255,255,.7)}
.crop-handle{position:absolute;right:-7px;bottom:-7px;width:14px;height:14px;background:var(--accent);border:2px solid #fff;border-radius:50%;cursor:nwse-resize}
.site-footer{border-top:1px solid var(--border);background:transparent;color:var(--muted);font-size:13px}
.site-footer .inner{max-width:1120px;margin:0 auto;padding:26px 20px 40px;text-align:center}
.privacy-badge{display:inline-flex;align-items:center;gap:6px;background:#ecfdf5;color:#059669;font-size:13px;padding:6px 12px;border-radius:999px;margin-top:12px}

/* ===== 文本/通用工具扩展类 ===== */
textarea{width:100%;padding:10px 12px;border:1px solid var(--border);border-radius:10px;font-size:14px;font-family:inherit;resize:vertical;line-height:1.55;color:var(--text)}
textarea:focus,input:focus,select:focus{outline:none;border-color:var(--accent)}
.code-box{background:#0f172a;color:#e2e8f0;padding:14px 16px;border-radius:10px;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:13px;white-space:pre-wrap;word-break:break-all;max-height:340px;overflow:auto;margin-top:12px}
.code-box mark{background:#fde047;color:#1f2329;border-radius:3px;padding:0 1px}
.out{margin-top:14px}
.out-label{font-size:13px;color:var(--muted);margin:14px 0 0;display:flex;align-items:center;justify-content:space-between;gap:8px}
.copy-btn{margin-top:0}
.muted{color:var(--muted);font-size:13px}
.hint{font-size:12px;color:var(--muted);margin-top:6px}
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:14px}
@media(max-width:640px){.grid2{grid-template-columns:1fr}}
.seg{display:inline-flex;border:1px solid var(--border);border-radius:10px;overflow:hidden}
.seg button{border:none;background:#fff;padding:9px 14px;font-size:14px;cursor:pointer;color:var(--muted)}
.seg button.active{background:var(--accent);color:#fff}
.seg button+button{border-left:1px solid var(--border)}

/* diff */
.diff-box{margin-top:12px;border:1px solid var(--border);border-radius:10px;overflow:hidden;font-family:ui-monospace,Menlo,Consolas,monospace;font-size:13px;white-space:pre-wrap;word-break:break-all}
.diff-line{padding:3px 10px;border-bottom:1px solid #f1f5f9}
.diff-add{background:#ecfdf5}
.diff-add:before{content:"+ ";color:#059669}
.diff-del{background:#fef2f2}
.diff-del:before{content:"- ";color:#dc2626}
.diff-eq{color:#475569}
.diff-eq:before{content:"  "}

/* 颜色转换 */
.swatch{width:46px;height:46px;border-radius:10px;border:1px solid var(--border);display:inline-block;vertical-align:middle;margin-left:10px}