:root{--blue:#2563eb;--blue-d:#1d4ed8;--indigo:#4338ca;--ink:#0f172a;--mute:#475569;--line:#e2e8f0;--bg:#f8fafc;--card:#fff;--ok:#16a34a;--err:#dc2626;--shadow:0 10px 30px rgba(15,23,42,.07)}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font:16px/1.7 system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;color:var(--ink);background:var(--bg);-webkit-font-smoothing:antialiased}
img{max-width:100%;height:auto}
a{color:var(--blue)}
[hidden]{display:none!important}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0)}
.wrap{max-width:1100px;margin:0 auto;padding:0 20px}
.narrow{max-width:800px}
.center{text-align:center}
.section{padding-top:28px;padding-bottom:8px}
.skip{position:absolute;left:-999px;top:0;background:#000;color:#fff;padding:8px 12px;z-index:100}
.skip:focus{left:0}
/* header */
.site-header{background:rgba(255,255,255,.92);backdrop-filter:blur(8px);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:50}
.bar{display:flex;align-items:center;justify-content:space-between;min-height:68px;gap:12px}
.brand{display:flex;align-items:center;gap:11px;font-weight:800;font-size:1.28rem;letter-spacing:-.02em;color:var(--ink);text-decoration:none}
.brand img{border-radius:10px;display:block}
.nav ul,.site-footer ul{list-style:none;margin:0;padding:0;display:flex;gap:4px;flex-wrap:wrap}
.nav a{display:block;padding:9px 16px;border-radius:999px;color:var(--ink);text-decoration:none;font-weight:600;font-size:.96rem}
.nav a:hover{background:#eff6ff;color:var(--blue)}
.nav a[aria-current]{background:var(--blue);color:#fff}
.menu-btn{display:none;background:#fff;border:1px solid var(--line);border-radius:10px;font-size:1.35rem;line-height:1;padding:8px 13px;cursor:pointer}
/* type */
h1{font-size:clamp(2rem,4.6vw,3rem);line-height:1.15;letter-spacing:-.025em;margin:.5em 0 .4em}
h2{font-size:clamp(1.45rem,3vw,1.85rem);line-height:1.3;letter-spacing:-.015em;margin:1.6em 0 .6em}
h3{font-size:1.1rem;margin:0 0 .4em}
.lead{font-size:1.14rem;color:var(--mute)}
/* hero */
.hero{background:radial-gradient(1200px 400px at 50% -10%,#dbeafe 0,transparent 70%),linear-gradient(180deg,#eff6ff,var(--bg));text-align:center;padding:40px 0 6px}
.hero .lead{max-width:720px;margin:0 auto}
.hero h1{margin-top:.3em}
.eyebrow{display:inline-block;background:#fff;border:1px solid #bfdbfe;color:var(--blue-d);font-weight:700;font-size:.82rem;padding:5px 14px;border-radius:999px;margin:0;letter-spacing:.02em}
/* buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;background:linear-gradient(135deg,var(--blue),var(--indigo));color:#fff;border:1px solid transparent;border-radius:12px;padding:12px 24px;font:700 1rem/1.2 inherit;font-family:inherit;cursor:pointer;text-decoration:none;box-shadow:0 6px 16px rgba(37,99,235,.28);transition:transform .12s,box-shadow .12s}
.btn:hover{transform:translateY(-1px);box-shadow:0 10px 22px rgba(37,99,235,.34)}
.btn:focus-visible,.drop textarea:focus-visible,select:focus-visible,input:focus-visible,summary:focus-visible{outline:3px solid #93c5fd;outline-offset:2px}
.btn:disabled{opacity:.5;cursor:not-allowed;transform:none;box-shadow:none}
.btn.ghost{background:#fff;color:var(--blue-d);border:1.5px solid #bfdbfe;box-shadow:none}
.btn.ghost:hover{background:#eff6ff;border-color:var(--blue)}
.btn.small{padding:8px 16px;font-size:.9rem;border-radius:10px}
/* tool */
.tool{padding-top:26px;padding-bottom:12px}
.drop{background:#fff;border:2px dashed #93c5fd;border-radius:20px;padding:38px 20px;text-align:center;transition:background .15s,border-color .15s;box-shadow:var(--shadow);min-height:290px;display:flex;flex-direction:column;justify-content:center}
.drop.over{background:#eff6ff;border-color:var(--blue)}
.drop.url-mode{border-style:solid;border-color:#bfdbfe}
.drop-title{font-size:1.4rem;font-weight:800;letter-spacing:-.01em;margin:10px 0 4px}
.drop-or{margin:6px 0 14px;color:var(--mute);display:flex;align-items:center;gap:14px;max-width:260px;margin-left:auto;margin-right:auto}
.drop-or:before,.drop-or:after{content:"";flex:1;height:1px;background:var(--line)}
.drop-btns{display:flex;gap:12px;justify-content:center;flex-wrap:wrap;margin:6px 0 12px}
.small{font-size:.9rem;color:var(--mute);margin:.4em 0}
.drop-url{max-width:640px;margin:0 auto;width:100%;animation:fade .18s ease}
@keyframes fade{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}
.urlbox{display:flex;gap:10px;align-items:flex-start;background:var(--bg);border:1.5px solid var(--line);border-radius:14px;padding:12px 14px;margin:12px 0;text-align:left}
.urlbox:focus-within{border-color:var(--blue);background:#fff;box-shadow:0 0 0 4px #dbeafe}
.urlbox-ico{color:var(--blue);padding-top:2px;display:flex}
.drop textarea{flex:1;border:0;background:transparent;font:1rem/1.5 ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;color:var(--ink);resize:vertical;min-height:70px;outline:0}
.url-error{color:var(--err);font-weight:600;font-size:.92rem;min-height:1.2em;margin:4px 0 0}
.controls{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:18px;background:#fff;border:1px solid var(--line);border-radius:16px;padding:18px;margin-top:18px;box-shadow:var(--shadow)}
.controls label{display:flex;flex-direction:column;gap:8px;font-weight:700;font-size:.95rem}
.controls input[type=number],.controls select{padding:10px 12px;border:1.5px solid var(--line);border-radius:10px;font:inherit;font-weight:500;background:#fff}
.controls input[type=range]{accent-color:var(--blue);width:100%}
.hint{margin:10px 2px 0}
.status{min-height:1.5em;color:var(--mute);font-weight:600;margin:10px 0 0}
.actions{display:flex;gap:10px;margin:10px 0}
.results{list-style:none;margin:0;padding:0;display:grid;gap:10px}
.results li{display:flex;gap:14px;align-items:center;background:#fff;border:1px solid var(--line);border-radius:14px;padding:10px 14px;flex-wrap:wrap}
.results img{width:64px;height:64px;object-fit:cover;border-radius:10px;background:#e2e8f0}
.results .info{flex:1;min-width:180px;overflow-wrap:anywhere}
.results .name{font-weight:700}
.results .sizes{font-size:.92rem;color:var(--mute)}
.results .save{color:var(--ok);font-weight:800}
/* download buttons: solid green, white bold label */
.results .btn,#dlAll{background:#15803d;color:#fff;border:1px solid #15803d;font-weight:800;opacity:1;box-shadow:0 6px 16px rgba(21,128,61,.30)}
.results .btn:hover,#dlAll:hover:not(:disabled){background:#166534;border-color:#166534;box-shadow:0 10px 22px rgba(21,128,61,.38)}
.results .btn:focus-visible,#dlAll:focus-visible{outline:3px solid #86efac}
#dlAll:disabled{background:#15803d;opacity:.45}
/* cards */
.grid,.grid3{display:grid;gap:18px;margin:18px 0}
.grid{grid-template-columns:repeat(auto-fill,minmax(290px,1fr))}
.grid3{grid-template-columns:repeat(auto-fit,minmax(250px,1fr))}
.card{background:#fff;border:1px solid var(--line);border-radius:16px;padding:22px;box-shadow:0 2px 8px rgba(15,23,42,.04)}
.card h3 a{color:var(--ink);text-decoration:none}
.card h3 a:hover{color:var(--blue)}
.card p{color:var(--mute);margin:.3em 0 .5em;font-size:.97rem}
.num{display:inline-flex;width:34px;height:34px;border-radius:50%;background:linear-gradient(135deg,var(--blue),var(--indigo));color:#fff;font-weight:800;align-items:center;justify-content:center;margin-bottom:10px}
.meta{color:var(--mute);font-size:.85rem}
.tablewrap{overflow-x:auto;border:1px solid var(--line);border-radius:12px;background:#fff}
table{border-collapse:collapse;width:100%;min-width:520px}
th,td{padding:12px 14px;text-align:left;border-bottom:1px solid var(--line);font-size:.96rem}
th{background:#eff6ff}
tr:last-child td{border-bottom:0}
.faq details{background:#fff;border:1px solid var(--line);border-radius:12px;padding:14px 18px;margin-bottom:10px}
.faq summary{cursor:pointer;font-weight:700}
.faq p{margin:.6em 0 0;color:var(--mute)}
/* articles */
.crumbs{font-size:.9rem;color:var(--mute);margin-top:18px}
.article{background:#fff;border:1px solid var(--line);border-radius:18px;padding:6px 32px 30px;margin:14px 0;box-shadow:var(--shadow)}
.article img{border-radius:10px}
.article table{display:block;overflow-x:auto}
.cta{background:#eff6ff;border:1px solid #bfdbfe;border-radius:14px;padding:18px;margin-top:30px;display:flex;gap:14px;align-items:center;flex-wrap:wrap}
.pager{display:flex;gap:8px;flex-wrap:wrap;margin:22px 0}
.pager a{padding:7px 14px;border:1px solid var(--line);border-radius:10px;text-decoration:none;background:#fff}
.pager a[aria-current]{background:var(--blue);color:#fff;border-color:var(--blue)}
.stepslist li{margin-bottom:12px}
/* footer */
.site-footer{background:#0b1220;color:#cbd5e1;margin-top:56px;padding:30px 0;text-align:center}
.site-footer ul{justify-content:center;gap:8px 24px}
.site-footer a{color:#e2e8f0;text-decoration:none;font-weight:500}
.site-footer a:hover{text-decoration:underline}
.copy{margin:18px 0 0;font-size:.92rem;color:#94a3b8}
@media(max-width:760px){
 .menu-btn{display:block}
 .nav{display:none;position:absolute;left:0;right:0;top:68px;background:#fff;border-bottom:1px solid var(--line);padding:10px 20px 14px;box-shadow:var(--shadow)}
 .nav.open{display:block}
 .nav ul{flex-direction:column}
 .nav a{border-radius:10px}
 .article{padding:2px 16px 22px}
 .drop{padding:28px 14px}
}
@media(prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}html{scroll-behavior:auto}}