:root{
  --pri:#3157e0;--pri-d:#2443b8;--pri-l:#eef2ff;
  --bg:#f6f7fb;--card:#fff;--ink:#1b2033;--sub:#646b80;--line:#e3e6ef;--ok:#14915f;--err:#d23a3a;
  --c-organize:#3157e0;--c-topdf:#e8780c;--c-frompdf:#14915f;--c-optimize:#7c4ddb;--c-edit:#d6336c;--c-security:#4b5875;
  --r:14px;--shadow:0 1px 2px rgba(20,30,60,.06),0 4px 14px rgba(20,30,60,.05);
  color-scheme:light;
}
@media (prefers-color-scheme:dark){:root{
  --pri:#6f8cff;--pri-d:#5876f0;--pri-l:#1d2440;
  --bg:#0f1220;--card:#171b2c;--ink:#e7e9f3;--sub:#9aa1b8;--line:#2a3047;
  --shadow:none;color-scheme:dark;
}}
*{box-sizing:border-box}
[hidden]{display:none!important}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font:15px/1.55 -apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei","Noto Sans CJK SC",sans-serif;-webkit-tap-highlight-color:transparent}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit;color:inherit}
button{cursor:pointer}
:focus-visible{outline:2px solid var(--pri);outline-offset:2px}
main{max-width:980px;margin:0 auto;padding:0 16px 120px;outline:none}

.top{position:sticky;top:0;z-index:20;display:flex;align-items:center;gap:12px;padding:10px 16px;padding-top:max(10px,env(safe-area-inset-top));background:color-mix(in srgb,var(--bg) 88%,transparent);backdrop-filter:saturate(1.6) blur(10px);-webkit-backdrop-filter:blur(10px)}
.brand{display:flex;align-items:center;gap:8px;font-weight:700;font-size:17px}
.brand svg{width:28px;height:28px}
.badges{margin-left:auto;display:flex;gap:6px;flex-wrap:wrap;justify-content:flex-end}
.badges b{font-weight:500;font-size:12px;color:var(--sub);background:var(--card);border:1px solid var(--line);border-radius:99px;padding:1px 8px}
@media (max-width:420px){.badges b:nth-child(3){display:none}}
.foot{max-width:980px;margin:0 auto;padding:24px 16px 40px;color:var(--sub);font-size:12px;text-align:center}
.foot p{margin:2px 0}
.foot .links{margin-top:8px;font-size:13px}
.foot a{color:var(--sub)}
.info{background:var(--card);border-radius:var(--r);box-shadow:var(--shadow);padding:16px 18px;margin-top:12px;line-height:1.75;font-size:15px}
.info h2.sec{margin:18px 0 6px}
.info ul{padding-left:1.2em;margin:6px 0}
.info li{margin:4px 0}
.info a{color:var(--pri);word-break:break-all}

/* home */
.hero{padding:14px 0 6px}
.hero h1{font-size:22px;margin:4px 0 2px;letter-spacing:.2px}
.hero p{margin:0;color:var(--sub);font-size:14px}
.search{position:relative;margin:12px 0 4px}
.search input{width:100%;height:46px;border:1px solid var(--line);background:var(--card);border-radius:12px;padding:0 14px 0 40px;font-size:16px;box-shadow:var(--shadow)}
.search svg{position:absolute;left:13px;top:14px;width:18px;height:18px;color:var(--sub)}
.carry{display:flex;align-items:center;gap:10px;background:var(--pri-l);border-radius:12px;padding:10px 12px;margin:10px 0;font-size:14px}
.carry button{margin-left:auto;border:0;background:none;color:var(--pri);font-weight:600}
h2.sec{font-size:13px;color:var(--sub);font-weight:600;margin:20px 2px 8px;letter-spacing:.5px}
.hot{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:8px}
.hot a{display:flex;flex-direction:column;align-items:center;gap:6px;padding:14px 2px 10px;white-space:nowrap;letter-spacing:-.2px;background:var(--card);border-radius:var(--r);box-shadow:var(--shadow);font-size:13px;text-align:center;line-height:1.25;transition:transform .12s}
.hot a:active{transform:scale(.96)}
.ico{width:40px;height:40px;border-radius:11px;display:grid;place-items:center;color:#fff;flex:none}
.ico svg{width:22px;height:22px}
.list{display:grid;grid-template-columns:1fr;gap:8px}
@media (min-width:640px){.list{grid-template-columns:1fr 1fr}.hot{grid-template-columns:repeat(8,minmax(0,1fr))}}
@media (min-width:900px){.list{grid-template-columns:1fr 1fr 1fr}}
.item{display:flex;gap:12px;align-items:center;padding:12px;background:var(--card);border-radius:var(--r);box-shadow:var(--shadow);transition:transform .12s}
.item:active{transform:scale(.985)}
.item b{display:block;font-size:15px;font-weight:600}
.item small{display:block;color:var(--sub);font-size:12.5px;line-height:1.4}
.empty{color:var(--sub);text-align:center;padding:40px 0}

/* tool page */
.tbar{display:flex;align-items:center;gap:10px;margin:8px 0 4px}
.back{width:38px;height:38px;border-radius:10px;border:1px solid var(--line);background:var(--card);display:grid;place-items:center;flex:none}
.back svg{width:20px;height:20px}
.tbar h1{font-size:19px;margin:0}
.tdesc{color:var(--sub);margin:2px 0 14px;font-size:14px}
.wx{margin:12px 0 4px;padding:10px 12px;border-radius:10px;background:color-mix(in srgb,#f59f00 14%,transparent);text-align:left;font-size:14px}
.wx p{margin:4px 0 8px;color:var(--sub)}
.wxrow{display:flex;gap:8px}
.wxrow input{flex:1;min-width:0;padding:6px 8px;border:1px solid var(--line);border-radius:8px;background:var(--card);color:var(--ink);font-size:12px}
.badge{display:inline-block;margin-left:8px;padding:1px 8px;border-radius:99px;font-size:12px;color:var(--ok);background:color-mix(in srgb,var(--ok) 12%,transparent);white-space:nowrap}
.drop{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:8px;min-height:170px;border:2px dashed color-mix(in srgb,var(--pri) 45%,var(--line));border-radius:18px;background:var(--card);text-align:center;padding:20px;transition:background .15s,border-color .15s}
.drop.over{background:var(--pri-l);border-color:var(--pri)}
.drop .btn{min-width:200px}
.drop small{color:var(--sub)}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;height:48px;padding:0 22px;border-radius:12px;border:0;background:var(--pri);color:#fff;font-weight:600;font-size:16px;box-shadow:0 4px 14px color-mix(in srgb,var(--pri) 35%,transparent)}
.btn{white-space:nowrap}
.btn svg{width:20px;height:20px;flex:none}
.btn.sm svg{width:17px;height:17px}
.btn:active{background:var(--pri-d)}
.btn[disabled]{opacity:.5;box-shadow:none}
.btn.ghost{background:var(--card);color:var(--ink);border:1px solid var(--line);box-shadow:none}
.btn.sm{height:36px;padding:0 12px;font-size:14px;border-radius:10px}
.files{display:flex;flex-direction:column;gap:6px;margin:12px 0}
.file{display:flex;align-items:center;gap:10px;padding:8px 10px;background:var(--card);border-radius:12px;border:1px solid var(--line);touch-action:pan-y}
.file .th{width:38px;height:48px;border-radius:6px;background:var(--bg);flex:none;object-fit:cover;display:grid;place-items:center;font-size:10px;color:var(--sub);border:1px solid var(--line)}
.file .nm{flex:1;min-width:0}
.file .nm b{display:block;font-weight:500;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.file .nm small{color:var(--sub)}
.ibtn{width:34px;height:34px;border:0;border-radius:9px;background:transparent;color:var(--sub);display:grid;place-items:center;flex:none}
.ibtn:hover{background:var(--bg)}
.ibtn svg{width:18px;height:18px}
.handle{cursor:grab;touch-action:none}
.dragging{opacity:.55;box-shadow:0 8px 24px rgba(0,0,0,.18)}
.addmore{align-self:flex-start}

.opts{display:grid;gap:14px;background:var(--card);border-radius:var(--r);padding:16px;box-shadow:var(--shadow);margin:12px 0}
.opt>label,.opt>.lbl{display:block;font-size:13.5px;color:var(--sub);margin-bottom:6px}
.opt input[type=text],.opt input[type=number],.opt input[type=password],.opt select{width:100%;height:44px;border:1px solid var(--line);border-radius:10px;background:var(--bg);padding:0 12px;font-size:16px}
.opt .hint{font-size:12px;color:var(--sub);margin-top:4px}
.seg{display:flex;flex-wrap:wrap;gap:6px}
.seg button{flex:1 1 auto;min-height:40px;padding:6px 12px;border-radius:10px;border:1px solid var(--line);background:var(--bg);font-size:14px}
.seg button[aria-pressed=true]{border-color:var(--pri);background:var(--pri-l);color:var(--pri);font-weight:600}
.check{display:flex;align-items:center;gap:10px;min-height:32px;font-size:15px}
.check input{width:20px;height:20px;accent-color:var(--pri)}
.range{display:flex;align-items:center;gap:12px}
.range input{flex:1;accent-color:var(--pri)}
.range output{min-width:44px;text-align:right;font-variant-numeric:tabular-nums;color:var(--sub)}
.opt input[type=color]{width:54px;height:36px;border:1px solid var(--line);border-radius:8px;background:none;padding:2px}
.pad{position:relative;border:1px dashed var(--line);border-radius:12px;background:#fff;touch-action:none}
.pad canvas{display:block;width:100%;height:170px;border-radius:12px}
.pad .ph{position:absolute;inset:0;display:grid;place-items:center;color:#9aa1b8;pointer-events:none}
.padbar{display:flex;gap:8px;margin-top:8px;flex-wrap:wrap}
.pick{display:flex;align-items:center;gap:10px}
.pick img{max-height:56px;max-width:120px;border-radius:6px;border:1px solid var(--line);background:repeating-conic-gradient(#ddd 0 25%,#fff 0 50%) 0/12px 12px}

.stage{position:relative;border-radius:6px;overflow:hidden;box-shadow:0 1px 4px rgba(0,0,0,.18);background:#fff;touch-action:manipulation}
.stage canvas{display:block;width:100%;height:auto}
.stage .sig{position:absolute;transform:translate(-50%,-50%);touch-action:none;cursor:move;outline:1.5px dashed var(--pri);outline-offset:2px;background:rgba(49,87,224,.06);user-select:none;-webkit-user-select:none}

/* page grid */
.pgbar{display:flex;gap:6px;flex-wrap:wrap;margin:10px 0}
.pages{display:grid;grid-template-columns:repeat(auto-fill,minmax(96px,1fr));gap:10px;margin-bottom:8px}
@media (min-width:640px){.pages{grid-template-columns:repeat(auto-fill,minmax(120px,1fr))}}
.pg{position:relative;background:var(--card);border:2px solid var(--line);border-radius:10px;padding:6px 6px 4px;text-align:center;user-select:none;-webkit-user-select:none;touch-action:manipulation}
.pg .cv{aspect-ratio:1/1.3;display:grid;place-items:center;overflow:hidden}
.pg canvas,.pg .blank{max-width:100%;max-height:100%;box-shadow:0 1px 3px rgba(0,0,0,.18);background:#fff;transition:transform .2s}
.pg .blank{width:70%;aspect-ratio:1/1.41}
.pg .n{font-size:12px;color:var(--sub)}
.pg.on{border-color:var(--pri);background:var(--pri-l)}
.pg.on::after{content:"✓";position:absolute;top:4px;right:4px;width:22px;height:22px;border-radius:50%;background:var(--pri);color:#fff;font-size:13px;display:grid;place-items:center}
.pg.del{opacity:.35}
.pg .acts{display:flex;justify-content:center;gap:2px}
.pg .acts .ibtn{width:28px;height:28px}
.pg .acts svg{width:16px;height:16px}

.bar{position:fixed;left:0;right:0;bottom:0;z-index:15;padding:10px 16px;padding-bottom:max(10px,env(safe-area-inset-bottom));background:color-mix(in srgb,var(--bg) 90%,transparent);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);border-top:1px solid var(--line)}
.bar .in{max-width:980px;margin:0 auto;display:flex;gap:10px;align-items:center}
.bar .btn{flex:1}
.bar .meta{font-size:12.5px;color:var(--sub);max-width:40%}

.prog{margin:18px 0;background:var(--card);border-radius:var(--r);padding:18px;box-shadow:var(--shadow);text-align:center}
.prog .track{height:8px;background:var(--bg);border-radius:9px;overflow:hidden;margin:12px 0 6px}
.prog .fill{height:100%;width:0;background:var(--pri);border-radius:9px;transition:width .2s}
.prog .fill.ind{width:35%;animation:ind 1.1s ease-in-out infinite}
@keyframes ind{0%{transform:translateX(-100%)}100%{transform:translateX(290%)}}
.done{margin:18px 0;background:var(--card);border-radius:18px;padding:22px 18px;box-shadow:var(--shadow);text-align:center}
.done .okc{width:56px;height:56px;border-radius:50%;background:color-mix(in srgb,var(--ok) 14%,transparent);color:var(--ok);display:grid;place-items:center;margin:0 auto 8px}
.done .okc svg{width:30px;height:30px}
.done h2{margin:4px 0;font-size:18px}
.done .fn{color:var(--sub);word-break:break-all;font-size:14px}
.done .stat{display:inline-block;margin:8px 0 2px;font-weight:600;color:var(--ok)}
.done .acts{display:flex;flex-direction:column;gap:10px;margin-top:16px}
@media (min-width:640px){.done .acts{flex-direction:row;justify-content:center}}
.next{margin-top:18px}
.next .hot{grid-template-columns:repeat(4,1fr)}
.err{color:var(--err)}

#toast{position:fixed;left:50%;bottom:96px;transform:translateX(-50%) translateY(20px);opacity:0;pointer-events:none;background:#1b2033;color:#fff;padding:10px 16px;border-radius:12px;font-size:14px;max-width:min(90vw,520px);transition:.2s;z-index:50;text-align:center}
#toast.show{opacity:1;transform:translateX(-50%)}
#toast.err{background:var(--err)}

/* usage guide: steps, tips and the "do this next" highlight */
.howto{display:flex;flex-wrap:wrap;gap:4px 6px;list-style:none;padding:0;margin:10px 0 0;counter-reset:h;font-size:13px;color:var(--sub)}
.howto li{display:flex;align-items:center;gap:5px;counter-increment:h}
.howto li::before{content:counter(h);width:18px;height:18px;border-radius:50%;display:grid;place-items:center;background:var(--pri-l);color:var(--pri);font-size:11px;font-weight:700}
.howto li+li::after{order:-1;content:"›";margin-right:2px;color:var(--line);font-weight:700}
.dragtip{margin-top:4px!important;font-size:12.5px!important}
@media (pointer:coarse){.dragtip{display:none}}
.steps{display:flex;list-style:none;padding:0;margin:2px 0 12px;counter-reset:s}
.steps li{flex:1;min-width:0;position:relative;display:flex;flex-direction:column;align-items:center;gap:3px;counter-increment:s;font-size:12px;line-height:1.3;color:var(--sub);text-align:center}
.steps li::before{content:counter(s);position:relative;z-index:1;width:24px;height:24px;border-radius:50%;display:grid;place-items:center;box-sizing:border-box;border:1.5px solid var(--line);background:var(--card);font-size:12px;font-weight:700}
.steps li+li::after{content:"";position:absolute;top:11.5px;right:50%;width:100%;height:1.5px;background:var(--line)}
.steps li.done::before{content:"✓";border-color:var(--ok);background:var(--ok);color:#fff}
.steps li.done+li::after,.steps li.done::after,.steps li.now::after{background:var(--ok)}
.steps li.now{color:var(--pri);font-weight:600}
.steps li.now::before{border-color:var(--pri);background:var(--pri);color:#fff;box-shadow:0 0 0 4px var(--pri-l)}
.tip{display:flex;gap:8px;align-items:flex-start;margin:0 0 12px;padding:8px 11px;border-radius:10px;background:color-mix(in srgb,var(--pri) 7%,var(--card));border:1px solid color-mix(in srgb,var(--pri) 18%,var(--line));font-size:13px;line-height:1.5;color:var(--ink)}
.tip svg{width:16px;height:16px;flex:none;margin-top:2px;color:var(--pri)}
.cue{outline:2px solid var(--pri);outline-offset:3px;animation:cue 1.5s ease-out 3}
.btn.cue{outline:none}
.btn.ghost.cue{border-color:var(--pri);background:var(--pri-l);color:var(--pri)}
.opt input.cue{outline-offset:1px;border-color:var(--pri)!important;background:var(--card)!important}
.pages.cue{outline-offset:4px;border-radius:10px}
.pad.cue{border:2px dashed var(--pri);outline:none}
.pad.cue .ph{color:var(--pri);font-weight:600}
@keyframes cue{0%{box-shadow:0 0 0 0 color-mix(in srgb,var(--pri) 50%,transparent)}70%,100%{box-shadow:0 0 0 12px transparent}}
.btn.wait{background:var(--pri-l);color:var(--pri);box-shadow:none}
.btn.wait[disabled]{opacity:.7}
.bar .meta.todo{color:var(--pri);cursor:pointer;line-height:1.35;max-width:52%}
.bar .meta.todo b{font-weight:700}
.done .btn.cue{box-shadow:0 4px 14px color-mix(in srgb,var(--pri) 35%,transparent)}
@media (prefers-reduced-motion:reduce){.cue{animation:none}}