:root{
  --bg:#0f1115; --card:#1a1d24; --fg:#e8e8ea; --muted:#9aa0aa;
  --pri:#4f8cff; --pri-d:#3a6fd8; --line:#2a2e38; --danger:#ff5a5a;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;
  background:var(--bg);color:var(--fg);-webkit-text-size-adjust:100%;
}
.topbar{
  display:flex;justify-content:space-between;align-items:center;
  padding:14px 18px;background:#14161c;border-bottom:1px solid var(--line);
  position:sticky;top:0;z-index:10;
}
.brand{font-weight:700;font-size:18px}
.topbar nav a{color:var(--muted);text-decoration:none;font-size:14px}
.container{max-width:760px;margin:0 auto;padding:16px;display:flex;flex-direction:column;gap:14px}
.card{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:16px}
.card h2{margin:0 0 10px;font-size:16px}
.hint{color:var(--muted);font-size:13px;margin:6px 0;line-height:1.6}
.hint strong{color:var(--fg)}

/* 拖拽上传区 */
.dropzone{
  border:2px dashed var(--line);border-radius:12px;padding:38px 16px;text-align:center;
  cursor:pointer;transition:.15s;background:#14161c;color:var(--muted);outline:none;
}
.dropzone:hover,.dropzone:focus{border-color:var(--pri);color:var(--fg)}
.dropzone.drag{border-color:var(--pri);background:rgba(79,140,255,.12);color:var(--fg)}
.dz-icon{font-size:42px;margin-bottom:8px}
.dz-text{font-size:15px;line-height:1.6}
.dz-text span{font-size:13px;color:var(--muted)}

.btn{
  display:inline-block;border:none;border-radius:10px;padding:10px 16px;
  background:#2a2e38;color:var(--fg);cursor:pointer;font-size:14px;
  -webkit-tap-highlight-color:transparent;
}
.btn.primary{background:var(--pri);color:#fff}
.btn.primary:active{background:var(--pri-d)}
.btn.primary:disabled{opacity:.45;cursor:not-allowed}
.btn.lg{padding:12px 22px;font-size:16px;width:100%}
.btn.small{padding:6px 10px;font-size:12px}
.preview-wrap{margin-top:14px}
.img-stage{
  position:relative;display:inline-block;max-width:100%;line-height:0;
  border-radius:10px;overflow:hidden;touch-action:none;user-select:none;
}
.img-stage img{display:block;max-width:100%;height:auto;pointer-events:none}
.sel-box{
  position:absolute;border:2px dashed var(--danger);
  background:rgba(255,90,90,.15);cursor:move;
}
.coord-row{display:flex;flex-wrap:wrap;gap:8px;margin-top:12px;align-items:center}
.coord-row label{font-size:12px;color:var(--muted);display:flex;align-items:center;gap:4px}
.coord-row input{
  width:62px;padding:6px;border-radius:8px;border:1px solid var(--line);
  background:#14161c;color:var(--fg);font-size:13px;
}
.radio{display:flex;align-items:center;gap:8px;margin:8px 0;font-size:14px;color:var(--fg)}
.radio input{width:16px;height:16px}
.status{margin-top:10px;font-size:13px;color:var(--muted);min-height:18px;word-break:break-all}
.compare{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:12px}
.compare>div{flex:1;min-width:140px}
.compare span{font-size:12px;color:var(--muted)}
.compare img{width:100%;border-radius:8px;border:1px solid var(--line);margin-top:4px;background:#000}
.hidden{display:none!important}

/* 后台 / 安装向导 */
.admin-wrap{max-width:960px;margin:0 auto;padding:16px}
table{width:100%;border-collapse:collapse;font-size:13px;margin-top:10px}
th,td{border:1px solid var(--line);padding:8px;text-align:left}
th{background:#14161c;color:var(--muted)}
.login-box{max-width:380px;margin:60px auto;background:var(--card);padding:24px;border-radius:14px;border:1px solid var(--line)}
.login-box h2{margin-top:0}
.login-box label{display:block;font-size:13px;color:var(--muted);margin:12px 0 4px}
.login-box input{width:100%;padding:10px;border-radius:8px;border:1px solid var(--line);background:#14161c;color:var(--fg)}
.login-box .btn{margin-top:16px;width:100%}
.setup-msg{margin:10px 0;font-size:13px;white-space:pre-wrap}
.setup-msg.ok{color:#7ee787}
.setup-msg.err{color:#ff7b7b}