:root{
  --ink:#0f172a; --muted:#5b6478; --line:#e4e8f5; --bg:#fff; --bg-soft:#f5f7ff;
  --primary:#3b5bfd; --primary-2:#8b4dff; --primary-ink:#2a43d6;
  --ok:#0aa774; --warn:#b7791f; --err:#d92d4a;
  --grad:linear-gradient(135deg,#3b5bfd 0%,#8b4dff 100%);
  --radius:18px; --shadow:0 10px 40px -12px rgba(59,91,253,.28);
  --font:Inter,ui-sans-serif,system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:var(--font);color:var(--ink);background:var(--bg);line-height:1.6;-webkit-font-smoothing:antialiased}
img{max-width:100%}
[hidden]{display:none!important}
a{color:var(--primary-ink)}
h1,h2,h3{line-height:1.2;letter-spacing:-.02em;margin:0 0 .5em}
h1{font-size:clamp(2.1rem,5.4vw,3.6rem);font-weight:800}
h2{font-size:clamp(1.55rem,3.4vw,2.2rem);font-weight:800}
h3{font-size:1.1rem;font-weight:700}
p{margin:0 0 1em}
.wrap{max-width:1120px;margin:0 auto;padding:0 20px}
.narrow{max-width:780px}
.skip{position:absolute;left:-999px}.skip:focus{left:12px;top:12px;background:#fff;padding:8px 12px;z-index:99}

/* header */
.site-header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.88);backdrop-filter:saturate(180%) blur(12px);border-bottom:1px solid var(--line)}
.header-in{display:flex;align-items:center;justify-content:space-between;height:66px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink)}
.brand-name{font-size:1.35rem;font-weight:800;letter-spacing:-.03em}
.brand-name b{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.nav{display:flex;gap:6px}
.nav a{white-space:nowrap;padding:8px 12px;border-radius:10px;color:var(--ink);text-decoration:none;font-weight:600;font-size:.95rem}
.nav a:hover,.nav a[aria-current]{background:var(--bg-soft);color:var(--primary-ink)}

/* hero */
.hero{padding:clamp(36px,6vw,72px) 0 28px;text-align:center;background:
  radial-gradient(900px 380px at 15% -10%,rgba(59,91,253,.13),transparent 60%),
  radial-gradient(800px 380px at 90% 0%,rgba(139,77,255,.12),transparent 60%)}
.eyebrow{display:inline-block;font-size:.8rem;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--primary-ink);background:#e9edff;padding:6px 12px;border-radius:99px;margin-bottom:16px}
.lead{max-width:680px;margin:0 auto 28px;font-size:1.15rem;color:var(--muted)}

/* tool */
.tool{max-width:760px;margin:0 auto;background:#fff;border:1px solid var(--line);border-radius:26px;padding:18px;box-shadow:var(--shadow);text-align:left}
.drop{display:flex;flex-direction:column;align-items:center;gap:6px;padding:34px 16px;border:2px dashed #b9c4ff;border-radius:20px;background:linear-gradient(180deg,#f8f9ff,#f1f4ff);cursor:pointer;transition:.18s}
.drop:hover,.drop:focus-visible{border-color:var(--primary);background:#eef1ff;outline:none}
.drop.over{border-color:var(--primary-2);background:#ece6ff;transform:scale(1.01)}
.drop-art svg{width:84px;height:84px}
.drop-art .p{fill:#fff;stroke:#b9c4ff;stroke-width:2}.drop-art .f{fill:#dfe5ff;stroke:#b9c4ff;stroke-width:2}
.drop-art .l{stroke:#b9c4ff;stroke-width:3;stroke-linecap:round}
.drop-art .b{fill:url(#none);fill:var(--primary)}.drop-art .a{stroke:#fff;stroke-width:3;fill:none;stroke-linecap:round;stroke-linejoin:round}
.drop-hint{margin:6px 0 0;color:var(--muted);font-size:.92rem}

.btn{white-space:nowrap;display:inline-flex;align-items:center;justify-content:center;gap:8px;border:0;border-radius:14px;padding:12px 20px;font:inherit;font-weight:700;color:#fff;background:var(--grad);cursor:pointer;text-decoration:none;box-shadow:0 8px 20px -8px rgba(59,91,253,.7);transition:transform .12s,box-shadow .12s,filter .12s}
.btn:hover{transform:translateY(-1px);filter:brightness(1.05)}
.btn:active{transform:translateY(0)}
.btn:focus-visible{outline:3px solid #b9c4ff;outline-offset:2px}
.btn-big{padding:15px 30px;font-size:1.08rem;border-radius:16px}
.btn-small{padding:8px 14px;font-size:.9rem;border-radius:10px;box-shadow:none}
.btn-ghost{background:#fff;color:var(--ink);border:1px solid var(--line);box-shadow:none}
.btn-ghost:hover{background:var(--bg-soft)}
.btn[disabled]{opacity:.55;pointer-events:none}

.options{margin:12px 4px 0;font-size:.95rem}
.options summary{cursor:pointer;font-weight:700;color:var(--ink);padding:6px 2px}
.options summary span{font-weight:500;color:var(--muted);margin-left:6px;font-size:.85rem}
.opt-grid{display:grid;grid-template-columns:1fr 1fr 1fr;gap:12px;margin-top:8px}
.opt-grid label{display:flex;flex-direction:column;gap:6px;font-weight:600;font-size:.85rem;color:var(--muted)}
input[type=text],input[type=password],select{font:inherit;padding:11px 12px;border:1px solid var(--line);border-radius:12px;background:#fff;color:var(--ink)}
input:focus{outline:3px solid #cfd7ff;border-color:var(--primary)}

.queue{list-style:none;margin:12px 0 0;padding:0;display:grid;gap:10px}
.file{display:grid;grid-template-columns:44px 1fr auto;gap:12px;align-items:center;padding:12px;border:1px solid var(--line);border-radius:16px;background:#fff}
.file .ficon{width:44px;height:44px;border-radius:12px;background:#ffecef;color:var(--err);display:grid;place-items:center;font-weight:800;font-size:.7rem}
.file.done .ficon{background:#e1f8ef;color:var(--ok)}
.file .meta{min-width:0}
.file .name{font-weight:700;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.file .fsub{font-size:.85rem;color:var(--muted)}
.file .fsub.err{color:var(--err)}.file .fsub.ok{color:var(--ok)}.file .fsub.warn{color:var(--warn)}
.bar{height:6px;border-radius:99px;background:#e9edff;margin-top:8px;overflow:hidden}
.bar i{display:block;height:100%;width:0;background:var(--grad);border-radius:99px;transition:width .2s}
.bar.indet i{width:40%;animation:slide 1.1s infinite ease-in-out}
@keyframes slide{0%{margin-left:-40%}100%{margin-left:100%}}
.file .side{display:flex;gap:8px;align-items:center}
.icon-btn{border:0;background:transparent;color:var(--muted);cursor:pointer;padding:8px;border-radius:10px;font:inherit;font-weight:600;font-size:.85rem}
.icon-btn:hover{background:var(--bg-soft);color:var(--ink)}

.actions{display:flex;gap:10px;justify-content:center;flex-wrap:wrap;margin-top:14px}
.notice{margin:12px 4px 0;padding:10px 14px;border-radius:12px;background:#fff1f3;color:var(--err);font-weight:600;font-size:.92rem}
.chips{list-style:none;display:flex;flex-wrap:wrap;gap:8px 10px;justify-content:center;margin:22px 0 0;padding:0}
.chips li{font-size:.85rem;font-weight:600;color:var(--muted);padding:6px 12px 6px 28px;border-radius:99px;background:#fff;border:1px solid var(--line);position:relative}
.chips li:before{content:"";position:absolute;left:11px;top:50%;width:10px;height:6px;border-left:2.5px solid var(--ok);border-bottom:2.5px solid var(--ok);transform:translateY(-70%) rotate(-45deg)}

/* ads (space is reserved so the layout never jumps) */
.ad{position:relative;margin:22px auto;width:calc(100% - 40px);max-width:100%;overflow:hidden;text-align:center}
.ad-leaderboard{max-width:728px;min-height:90px}
.ad-rectangle{max-width:728px;min-height:250px}
.ad-result{max-width:728px;min-height:100px;margin:14px auto 0}
.ad-label{display:block;font-size:.65rem;letter-spacing:.08em;text-transform:uppercase;color:#98a0b5;margin-bottom:4px}
.ad-placeholder{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:4px;border:1px dashed #cfd5e8;border-radius:12px;background:repeating-linear-gradient(45deg,#fafbff,#fafbff 10px,#f3f5fc 10px,#f3f5fc 20px);color:#8a93ab;font-size:.85rem}

/* sections */
.section{padding:clamp(44px,7vw,84px) 0}
.section.alt{background:var(--bg-soft)}
.section h2{text-align:center}
.sub{max-width:620px;margin:0 auto 32px;text-align:center;color:var(--muted)}
.steps{list-style:none;display:grid;grid-template-columns:repeat(3,1fr);gap:20px;padding:0;margin:32px 0 0;counter-reset:s}
.steps li{padding:26px;border:1px solid var(--line);border-radius:var(--radius);background:#fff;text-align:left}
.num{display:grid;place-items:center;width:40px;height:40px;border-radius:12px;background:var(--grad);color:#fff;font-weight:800;margin-bottom:14px}
.steps p{color:var(--muted);margin:0}
.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.card{padding:24px;background:#fff;border:1px solid var(--line);border-radius:var(--radius);transition:.18s}
.card:hover{transform:translateY(-3px);box-shadow:var(--shadow)}
.card p{color:var(--muted);margin:0}
.ico{display:grid;place-items:center;width:46px;height:46px;border-radius:14px;background:#e9edff;margin-bottom:14px}
.ico svg{width:24px;height:24px;fill:none;stroke:var(--primary);stroke-width:1.9;stroke-linecap:round;stroke-linejoin:round}
.ico svg .solid{fill:var(--primary)}
.prose{font-size:1.04rem}
.prose h1{font-size:clamp(1.9rem,4.5vw,2.8rem)}
.prose h2{text-align:left;margin-top:1.6em}
.prose .lead{margin:0 0 1.2em}
.prose li{margin:.35em 0}
.prose code{background:#eef1ff;padding:2px 6px;border-radius:6px}
.faq{display:grid;gap:10px;margin-top:24px}
.faq details{background:#fff;border:1px solid var(--line);border-radius:14px;padding:4px 18px}
.faq summary{cursor:pointer;font-weight:700;padding:14px 0;list-style:none;display:flex;justify-content:space-between;gap:12px}
.faq summary::-webkit-details-marker{display:none}
.faq summary:after{content:"+";font-size:1.4rem;line-height:1;color:var(--primary)}
.faq details[open] summary:after{content:"–"}
.faq p{color:var(--muted)}
.cta{text-align:center}
.cta p{color:var(--muted)}

/* footer */
.site-footer{background:#0b1020;color:#c5cbe0;padding:48px 0 0}
.footer-in{display:grid;grid-template-columns:2fr 1fr 1fr;gap:30px}
.site-footer .brand{color:#fff}
.site-footer h3{color:#fff;font-size:.9rem;text-transform:uppercase;letter-spacing:.08em}
.site-footer a,.site-footer .soon{display:block;color:#c5cbe0;text-decoration:none;padding:3px 0;font-size:.95rem}
.site-footer a:hover{color:#fff}.site-footer .soon{opacity:.5}
.footer-brand p{max-width:340px;font-size:.95rem}
.copyright{padding:22px 20px;margin-top:28px;border-top:1px solid #1d2540;font-size:.82rem;color:#8d95b3}

.cookie{position:fixed;left:50%;bottom:16px;transform:translateX(-50%);z-index:80;display:flex;gap:14px;align-items:center;max-width:560px;width:calc(100% - 24px);background:#0f172a;color:#e6e9f5;padding:12px 16px;border-radius:16px;box-shadow:0 20px 50px -10px rgba(0,0,0,.45);font-size:.9rem}
.cookie[hidden]{display:none}
.cookie p{margin:0}.cookie a{color:#b9c4ff}

@media (max-width:820px){
  .opt-grid{grid-template-columns:1fr 1fr}
  .steps,.grid{grid-template-columns:1fr}
  .footer-in{grid-template-columns:1fr 1fr}.footer-brand{grid-column:1/-1}
  .nav a:nth-child(n+4){display:none}
}
@media (max-width:560px){
  .opt-grid{grid-template-columns:1fr}
  .file{grid-template-columns:40px 1fr}.file .side{grid-column:1/-1;justify-content:flex-end}
  .drop{padding:26px 12px}
  .nav a:nth-child(n+2){display:none}
}
@media (prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important;scroll-behavior:auto!important}}

/* SEO pages */
.hero-sub{padding-bottom:20px}
.crumbs{display:flex;flex-wrap:wrap;gap:6px;align-items:center;justify-content:center;font-size:.85rem;color:var(--muted);margin-bottom:14px}
.prose .crumbs{justify-content:flex-start}
.crumbs a{color:var(--muted);text-decoration:none}.crumbs a:hover{color:var(--primary-ink);text-decoration:underline}
.native{max-width:640px;margin:-10px auto 22px;padding:12px 16px;border-radius:14px;background:#f3f5ff;border:1px solid var(--line);color:var(--ink);font-size:1.08rem;line-height:1.9}
.native[dir=rtl]{text-align:right}
.card-link{display:block;color:inherit;text-decoration:none}
.card-link h3{color:var(--ink)}.card-link:hover h3{color:var(--primary-ink)}
.grid-2{grid-template-columns:repeat(2,1fr);margin:24px 0}
.byline{color:var(--muted);font-size:.9rem;margin:-4px 0 18px}
kbd{font:inherit;font-size:.85em;padding:1px 6px;border:1px solid var(--line);border-bottom-width:2px;border-radius:6px;background:#f6f7fb}
.prose ol{padding-left:1.3em}
@media (max-width:820px){.grid-2{grid-template-columns:1fr}}