:root{
    --ink:#0B1220;
    --ink-soft:#3A4453;
    --mute:#6B7687;
    --canvas:#EFF2F7;
    --card:#fff;
    --line:#DEE4EE;
    --brand:#3B34E8;
    --brand-dark:#2A24C9;
    --signal:#D6F84C;
    --r-lg:18px; --r-md:12px; --r-sm:9px;
    --shadow-1:0 1px 2px rgba(11,18,32,.06),0 4px 12px -6px rgba(11,18,32,.12);
    --shadow-2:0 2px 4px rgba(11,18,32,.05),0 28px 60px -28px rgba(11,18,32,.45);
    --display:"Bricolage Grotesque","Archivo",Georgia,serif;
    --ui:"Inter",-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  }
  *{box-sizing:border-box}
  html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
  body{margin:0;background:var(--canvas);color:var(--ink);font-family:var(--ui);font-size:16px;line-height:1.55;-webkit-font-smoothing:antialiased}
  h1,h2,h3{font-family:var(--display);font-weight:600;letter-spacing:-.025em;margin:0}
  a{color:var(--brand);text-underline-offset:2px}
  .num{font-variant-numeric:tabular-nums}
  .shell{max-width:1180px;margin:0 auto;padding:0 22px}

  /* ── nav ── */
  .nav{background:var(--ink);color:#fff}
  .nav .shell{display:flex;align-items:center;justify-content:space-between;gap:18px;height:62px}
  .logo{display:flex;align-items:center;gap:10px;text-decoration:none;color:#fff;font-family:var(--display);font-weight:700;font-size:18px;letter-spacing:-.02em}
  .glyph{width:26px;height:26px;border-radius:7px;background:var(--signal);position:relative;flex:0 0 auto}
  .glyph::before{content:"";position:absolute;inset:6px 5px;background:
    repeating-linear-gradient(90deg,var(--ink) 0 2px,transparent 2px 4px)}
  .nav nav{display:flex;align-items:center;gap:22px;font-size:14.5px}
  .nav nav>a{color:#AAB4C4;text-decoration:none}
  .nav nav>a:hover{color:#fff}
  @media (max-width:760px){.nav nav>a{display:none}}
  .navmenu{position:relative;display:block}
  .navmenu>button{display:flex;align-items:center;gap:6px;background:none;border:0;padding:6px 2px;
    color:#AAB4C4;font:inherit;font-size:14.5px;cursor:pointer;border-radius:6px}
  .navmenu>button:hover{background:none;color:#fff}
  .navmenu>button svg{width:14px;height:14px;transition:transform .15s}
  .navmenu>button[aria-expanded=true] svg{transform:rotate(180deg)}
  .navmenu>button[aria-expanded=true]{color:#fff}
  .navmenu>button:focus-visible{outline:3px solid var(--signal);outline-offset:2px}
  .menu{position:absolute;top:calc(100% + 10px);left:-10px;z-index:30;min-width:290px;
    background:#fff;border-radius:var(--r-md);box-shadow:var(--shadow-2);padding:6px;
    border:1px solid var(--line)}
  .menu a{display:block;padding:10px 12px;border-radius:var(--r-sm);text-decoration:none;color:var(--ink)}
  .menu a:hover{background:#F4F5FF}
  .menu a b{display:block;font-size:14.5px;font-weight:600;letter-spacing:-.01em}
  .menu a small{display:block;color:var(--mute);font-size:12.5px;margin-top:2px}
  .menu a.cur{background:#F4F5FF}
  .menu a.cur b::after{content:" ✓";color:var(--brand)}

  /* ── hero ── */
  .hero{background:var(--ink);color:#fff;padding:56px 0 132px;position:relative;overflow:hidden}
  .hero::after{content:"";position:absolute;inset:0;opacity:.16;pointer-events:none;
    background:repeating-linear-gradient(90deg,#fff 0 2px,transparent 2px 5px,#fff 5px 6px,transparent 6px 13px);
    mask-image:linear-gradient(180deg,rgba(0,0,0,.55),transparent 62%);
    -webkit-mask-image:linear-gradient(180deg,rgba(0,0,0,.55),transparent 62%)}
  .hero .shell{position:relative;z-index:1}
  .chip{display:inline-flex;align-items:center;gap:8px;background:rgba(214,248,76,.14);color:var(--signal);
    border:1px solid rgba(214,248,76,.32);border-radius:999px;padding:5px 13px;font-size:13px;font-weight:500}
  h1{font-size:clamp(33px,5.6vw,58px);line-height:1.02;margin:18px 0 0;max-width:17em;font-weight:700}
  h1 em{font-style:normal;color:var(--signal)}
  .lede{color:#B6C0CF;font-size:clamp(16px,1.9vw,19px);margin:16px 0 0;max-width:52ch}
  .marks{display:flex;flex-wrap:wrap;gap:8px 22px;margin:24px 0 0;padding:0;list-style:none;color:#8F9BAC;font-size:14px}
  .marks li{display:flex;align-items:center;gap:7px}
  .marks li::before{content:"";width:6px;height:6px;border-radius:50%;background:var(--signal)}

  /* ── tool card floats over the hero ── */
  .lift{margin-top:-104px;position:relative;z-index:2}
  .card{background:var(--card);border-radius:var(--r-lg);box-shadow:var(--shadow-2);padding:24px}
  @media (max-width:520px){.card{padding:16px}}

  .drop{display:block;width:100%;text-align:center;font:inherit;color:inherit;cursor:pointer;position:relative;
    background:#F7F9FC;border:2px dashed #C6D0E0;border-radius:var(--r-md);padding:32px 24px 28px;
    transition:border-color .15s,background .15s,box-shadow .15s}
  .drop>*{pointer-events:none}          /* stops dragleave flicker over children */
  .drop:hover,.drop.hot{border-color:var(--brand);background:#F4F5FF}
  .drop.hot{border-style:solid;box-shadow:inset 0 0 0 4px rgba(59,52,232,.09)}
  .drop:focus-visible{outline:3px solid var(--brand);outline-offset:3px}
  .dropart{display:block;width:134px;height:118px;margin:0 auto 16px}
  .drop b{display:block;font-family:var(--display);font-weight:600;font-size:clamp(19px,2.7vw,23px);letter-spacing:-.02em;line-height:1.2}
  .drop i{display:block;font-style:normal;color:var(--mute);font-size:14.5px;margin-top:7px}
  .drop .hot-only{display:none}
  .drop.hot .idle-only{display:none}
  .drop.hot .hot-only{display:block}
  .pick{display:inline-flex;align-items:center;gap:9px;margin-top:18px;
    background:var(--brand);color:#fff;border-radius:var(--r-sm);padding:12px 22px;
    font-weight:600;font-size:15.5px;box-shadow:0 10px 20px -12px rgba(59,52,232,.9)}
  .drop:hover .pick,.drop.hot .pick{background:var(--brand-dark)}
  .pick svg{width:17px;height:17px;flex:0 0 auto}
  .where{margin:14px 0 0;font-size:12.5px;color:#8A94A6;letter-spacing:.01em}
  .where kbd{font:inherit;background:#EAEEF5;border-radius:5px;padding:2px 6px;color:var(--ink-soft)}
  @media (prefers-reduced-motion:no-preference){
    .dropart{transition:transform .2s ease}
    .drop:hover .dropart{transform:translateY(-3px)}
    .drop.hot .dropart{transform:translateY(4px) scale(1.04)}
  }
  @media (max-width:520px){
    .dropart{width:104px;height:92px;margin-bottom:12px}
    .drop{padding:26px 16px 22px}
    .where{display:none}
  }
  input[type=file]{position:absolute;width:1px;height:1px;opacity:0;pointer-events:none}
  .trust{color:var(--mute);font-size:13px;margin:12px 2px 0}
  .err{color:#B3261E;font-size:14.5px;margin:10px 2px 0}

  /* ── output mode toggle ── */
  .mode{margin:20px 0 0}
  .mode>p{margin:0 0 9px;font-size:13px;color:var(--mute);font-weight:500}
  .segs{display:grid;grid-template-columns:1fr 1fr;gap:10px}
  @media (max-width:460px){.segs{grid-template-columns:1fr}}
  .seg{display:block;position:relative;cursor:pointer}
  .seg input{position:absolute;width:1px;height:1px;opacity:0}
  .segin{display:flex;align-items:flex-start;gap:11px;background:#fff;border:1.5px solid var(--line);
    border-radius:var(--r-md);padding:13px 15px;height:100%;
    transition:border-color .15s,background .15s,box-shadow .15s}
  .segin>svg{width:22px;height:22px;flex:0 0 auto;margin-top:2px;color:var(--mute);transition:color .15s}
  .segin strong{display:block;font-size:14.5px;font-weight:600;letter-spacing:-.01em}
  .segin small{display:block;color:var(--mute);font-size:12.5px;margin-top:3px;line-height:1.4}
  .seg:hover .segin{border-color:#B4BFD2}
  .seg input:checked+.segin{border-color:var(--brand);background:#F4F5FF;box-shadow:0 0 0 3px rgba(59,52,232,.10)}
  .seg input:checked+.segin>svg{color:var(--brand)}
  .seg input:focus-visible+.segin{outline:3px solid var(--brand);outline-offset:2px}
  .a4opt{display:none;align-items:center;gap:11px;flex-wrap:wrap;margin-top:11px;
    background:#F7F9FC;border:1px solid var(--line);border-radius:var(--r-sm);padding:10px 13px}
  .a4opt.on{display:flex}
  .a4opt label{font-size:13.5px;color:var(--ink-soft);font-weight:500}
  .a4opt select{width:auto;padding:7px 9px;font-size:13.5px}
  .a4opt em{font-style:normal;font-size:12.5px;color:var(--mute)}
  .fields .a4only{display:none}
  .fields.a4 .a4only{display:block}

  /* result */
  .result{display:none;gap:26px;margin-top:22px;padding-top:22px;border-top:1px solid var(--line);
    grid-template-columns:auto minmax(0,1fr);align-items:start}
  .result.on{display:grid}
  @media (max-width:640px){.result.on{grid-template-columns:1fr;justify-items:center}}
  .sheetbox{position:relative;background:#fff;border-radius:6px;border:1px solid var(--line);box-shadow:var(--shadow-1);overflow:hidden;flex:0 0 auto}
  .sheetbox canvas{position:absolute;left:0;top:0}
  .sheets{display:flex;gap:16px;align-items:flex-start;flex-wrap:wrap}
  .sheets figure{margin:0;display:flex;flex-direction:column;align-items:center;gap:7px}
  .sheets figcaption{font-size:12px;color:var(--mute);letter-spacing:.03em;text-transform:uppercase}
  .pill{border-radius:999px}
  .mini.sel{background:var(--brand);border-color:var(--brand);color:#fff}
  .mini.sel:hover{background:var(--brand-dark)}
  .facts{list-style:none;margin:0 0 18px;padding:0;display:grid;gap:2px}
  .facts b{font-family:var(--display);font-size:26px;font-weight:600;letter-spacing:-.02em;display:block;line-height:1.15}
  .facts span{color:var(--mute);font-size:14px}
  .go{display:flex;gap:10px;flex-wrap:wrap;align-items:center}
  button{font:inherit;cursor:pointer;border-radius:var(--r-sm);border:1px solid var(--line);background:#fff;color:var(--ink);padding:10px 15px;font-weight:500;transition:background .15s,border-color .15s}
  button:hover{background:#F3F5F9}
  button:focus-visible{outline:3px solid var(--brand);outline-offset:2px}
  button:disabled{opacity:.42;cursor:not-allowed}
  button.primary{background:var(--brand);border-color:var(--brand);color:#fff;font-weight:600;font-size:17px;padding:14px 24px;border-radius:var(--r-md);box-shadow:0 8px 20px -10px rgba(59,52,232,.8)}
  button.primary:hover{background:var(--brand-dark);border-color:var(--brand-dark)}
  button.mini{padding:6px 11px;font-size:13px;color:var(--ink-soft)}
  .track{height:4px;border-radius:99px;background:#E4E9F1;margin-top:14px;display:none;overflow:hidden}
  .track.on{display:block}
  .track i{display:block;height:100%;background:var(--brand);width:0;border-radius:99px}
  .status{color:var(--mute);font-size:13.5px;margin:10px 0 0;min-height:19px}

  /* advanced */
  details.adv{margin-top:20px;border-top:1px solid var(--line);padding-top:14px}
  details.adv summary{cursor:pointer;font-size:14.5px;color:var(--ink-soft);font-weight:500;width:fit-content;list-style:none;display:flex;align-items:center;gap:8px}
  details.adv summary::-webkit-details-marker{display:none}
  details.adv summary::before{content:"+";font-family:var(--display);font-weight:600;color:var(--brand)}
  details.adv[open] summary::before{content:"–"}
  details.adv summary:focus-visible{outline:3px solid var(--brand);outline-offset:3px}
  .advgrid{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:22px;margin-top:16px}
  @media (max-width:760px){.advgrid{grid-template-columns:1fr}}
  .stage{position:relative;background:#F2F4F8;border:1px solid var(--line);border-radius:var(--r-md);display:flex;justify-content:center;padding:12px;overflow:hidden}
  .stage canvas{display:block;background:#fff;border-radius:3px;box-shadow:var(--shadow-1);touch-action:none}
  .frame{position:absolute;border:2px solid var(--brand);border-radius:2px;background:rgba(59,52,232,.06);cursor:move;touch-action:none}
  .frame::after{content:"";position:absolute;inset:-2px;box-shadow:0 0 0 9999px rgba(11,18,32,.42);pointer-events:none}
  .hnd{position:absolute;width:15px;height:15px;background:#fff;border:2.5px solid var(--brand);border-radius:3px;z-index:2}
  .hnd[data-dir=nw]{left:-8px;top:-8px;cursor:nwse-resize}
  .hnd[data-dir=ne]{right:-8px;top:-8px;cursor:nesw-resize}
  .hnd[data-dir=sw]{left:-8px;bottom:-8px;cursor:nesw-resize}
  .hnd[data-dir=se]{right:-8px;bottom:-8px;cursor:nwse-resize}
  .hnd[data-dir=n]{left:50%;top:-8px;margin-left:-7px;cursor:ns-resize}
  .hnd[data-dir=s]{left:50%;bottom:-8px;margin-left:-7px;cursor:ns-resize}
  .hnd[data-dir=w]{left:-8px;top:50%;margin-top:-7px;cursor:ew-resize}
  .hnd[data-dir=e]{right:-8px;top:50%;margin-top:-7px;cursor:ew-resize}
  .pager{display:flex;gap:8px;align-items:center;flex-wrap:wrap;margin-top:10px}
  .pager .n{color:var(--mute);font-size:12.5px}
  label.f{display:block;font-size:13px;color:var(--mute);margin-bottom:5px}
  .fields{display:grid;grid-template-columns:1fr 1fr;gap:12px}
  input[type=number],select{width:100%;font:inherit;font-size:14.5px;color:var(--ink);background:#fff;border:1px solid var(--line);border-radius:var(--r-sm);padding:9px 10px;font-variant-numeric:tabular-nums}
  input[type=number]:focus-visible,select:focus-visible{outline:2px solid var(--brand);outline-offset:0;border-color:var(--brand)}

  /* ── ad slots: reserved space, placeholder vanishes once code is pasted ── */
  .adslot{background:#fff;border:1px dashed #C9D3E2;border-radius:var(--r-md);
    display:grid;place-items:center;color:#9AA5B5;font-size:12.5px;letter-spacing:.02em;overflow:hidden}
  .adslot:empty::before{content:attr(data-label)}
  .adslot:not(:empty){border:0;background:none;display:block;min-height:0}
  .ad-lead{min-height:104px;margin:26px 0 0}
  .ad-inline{min-height:268px;margin:34px 0}
  .ad-rail{min-height:604px;position:sticky;top:22px}
  .ad-foot{min-height:104px;margin:34px 0 0}

  /* ── body layout with sticky ad rail ── */
  .layout{display:grid;grid-template-columns:minmax(0,1fr);gap:34px;padding-top:8px}
  @media (min-width:1040px){
    .layout{grid-template-columns:minmax(0,1fr) 300px;gap:40px;align-items:start}
  }
  aside.rail{display:none}
  @media (min-width:1040px){aside.rail{display:block}}

  section.block{padding:40px 0 0}
  h2{font-size:clamp(24px,3.4vw,32px);margin-bottom:12px}
  h3{font-size:17px;font-weight:600;margin-bottom:4px}
  .block p{color:var(--ink-soft);max-width:66ch}
  .steps{list-style:none;counter-reset:s;padding:0;margin:20px 0 0;display:grid;gap:14px;grid-template-columns:repeat(3,minmax(0,1fr))}
  @media (max-width:760px){.steps{grid-template-columns:1fr}}
  .steps li{counter-increment:s;background:#fff;border:1px solid var(--line);border-radius:var(--r-md);padding:18px}
  .steps li::before{content:counter(s);display:grid;place-items:center;width:26px;height:26px;border-radius:8px;
    background:var(--ink);color:var(--signal);font-family:var(--display);font-weight:600;font-size:14px;margin-bottom:10px}
  .steps p{margin:4px 0 0;font-size:14.5px;color:var(--mute)}
  .specs{background:#fff;border:1px solid var(--line);border-radius:var(--r-md);margin-top:18px;overflow:hidden}
  .specs div{display:flex;justify-content:space-between;gap:16px;padding:13px 18px;font-size:14.5px}
  .specs div+div{border-top:1px solid var(--line)}
  .specs dt{color:var(--mute);margin:0}
  .specs dd{margin:0;font-weight:500;font-variant-numeric:tabular-nums;text-align:right}
  .callout{background:#fff;border:1px solid var(--line);border-left:4px solid var(--brand);border-radius:var(--r-md);padding:18px 20px;margin-top:18px}
  .callout p{margin:0}
  details.q{background:#fff;border:1px solid var(--line);border-radius:var(--r-md);padding:15px 18px;margin-top:10px}
  details.q summary{cursor:pointer;font-weight:600;font-size:16px;list-style:none;display:flex;justify-content:space-between;gap:14px;align-items:center}
  details.q summary::-webkit-details-marker{display:none}
  details.q summary::after{content:"+";color:var(--brand);font-family:var(--display);font-weight:600;font-size:19px}
  details.q[open] summary::after{content:"–"}
  details.q summary:focus-visible{outline:3px solid var(--brand);outline-offset:3px}
  details.q p{margin:10px 0 0;font-size:15px;color:var(--ink-soft);max-width:62ch}

  footer{background:var(--ink);color:#8F9BAC;margin-top:48px;padding:30px 0;font-size:14px}
  footer .shell{display:flex;justify-content:space-between;gap:18px;flex-wrap:wrap}
  footer a{color:#C3CBD8;text-decoration:none}
  footer a:hover{color:#fff}
  @media (prefers-reduced-motion:no-preference){.track i{transition:width .2s linear}}
  @media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important}}