/* avifjpg — dark-tech design system (06 v2) */
:root{
  --bg:#080b12;
  --bg-2:#0c111b;
  --surface:#111824;
  --surface-2:#161f2e;
  --border:#222c3d;
  --border-bright:#2c3a50;
  --text:#e8eef6;
  --text-muted:#90a0b6;
  --text-dim:#5e6e85;
  --accent:#7c6cff;        /* electric indigo-violet */
  --accent-2:#c45cff;      /* fuchsia */
  --accent-3:#27e0c4;      /* mint pop, used sparingly */
  --grad:linear-gradient(135deg,#7c6cff 0%,#c45cff 100%);
  --glow:0 0 0 1px rgba(124,108,255,.35), 0 12px 40px -12px rgba(124,108,255,.55);
  --danger:#ff6b6b; --danger-soft:#2a161b;
  --success:#27e0a0; --success-soft:#0f2620;
  --font:'Inter',-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif;
  --display:'Space Grotesk',var(--font);
  --h1:clamp(2rem,4.4vw,3.2rem); --h2:clamp(1.3rem,2.4vw,1.7rem); --body:1rem; --small:.875rem;
  --gap:16px; --pad:24px; --radius:16px; --radius-sm:10px;
  --shadow:0 1px 2px rgba(0,0,0,.4),0 16px 40px -20px rgba(0,0,0,.8);
  --maxw:920px;
}
@media (prefers-color-scheme:light){:root{
  --bg:#f7f8fc; --bg-2:#eef1f8; --surface:#ffffff; --surface-2:#f3f5fb;
  --border:#e2e6f0; --border-bright:#d3d9e8; --text:#141a2b; --text-muted:#5a6680; --text-dim:#8a93a8;
  --shadow:0 1px 2px rgba(20,26,43,.05),0 18px 44px -22px rgba(60,50,120,.28);
  --danger-soft:#fdecec; --success-soft:#e7f6ee;
}}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:var(--font);font-size:var(--body);line-height:1.65;color:var(--text);background:var(--bg);-webkit-font-smoothing:antialiased;overflow-x:hidden}
a{color:var(--text);text-decoration:none}
a:hover{color:#fff}
@media (prefers-color-scheme:light){a:hover{color:#000}}
img,svg{max-width:100%}
h1,h2,h3{font-family:var(--display);font-weight:600;letter-spacing:-.02em;line-height:1.12}
h1{font-size:var(--h1);margin:.1em 0 .35em}
h2{font-size:var(--h2);margin:1.8em 0 .55em}
h3{font-size:1.05rem;margin:0 0 4px}
p{margin:.55em 0}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 var(--pad)}
.eyebrow{font-family:var(--display);font-size:.74rem;letter-spacing:.18em;text-transform:uppercase;color:var(--accent);font-weight:600;display:inline-flex;align-items:center;gap:8px}

/* background ambience */
body::before{content:"";position:fixed;inset:0;z-index:-2;background:
  radial-gradient(60vw 40vw at 50% -8%,rgba(124,108,255,.22),transparent 70%),
  radial-gradient(40vw 30vw at 90% 0%,rgba(196,92,255,.14),transparent 70%);
  pointer-events:none}
body::after{content:"";position:fixed;inset:0;z-index:-2;opacity:.4;pointer-events:none;
  background-image:linear-gradient(var(--border) 1px,transparent 1px),linear-gradient(90deg,var(--border) 1px,transparent 1px);
  background-size:44px 44px;
  mask-image:radial-gradient(70vw 50vh at 50% 0,#000,transparent 75%)}

/* header */
.site-header{position:sticky;top:0;z-index:30;background:color-mix(in srgb,var(--bg) 72%,transparent);backdrop-filter:saturate(1.4) blur(12px);border-bottom:1px solid var(--border)}
.site-header .wrap{display:flex;align-items:center;gap:var(--gap);min-height:60px;flex-wrap:wrap}
.brand{display:flex;align-items:center;gap:9px;font-family:var(--display);font-weight:600;font-size:1.18rem;letter-spacing:-.01em}
.brand .logo{width:26px;height:26px;border-radius:8px;background:var(--grad);display:grid;place-items:center;box-shadow:0 6px 18px -6px var(--accent)}
.brand b{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.nav{display:flex;gap:6px;margin-left:auto;align-items:center;font-size:var(--small)}
.nav .navlink{color:var(--text-muted);white-space:nowrap;padding:8px 12px;border-radius:9px;font-weight:500}
.nav .navlink:hover{color:var(--text);background:var(--surface)}
.nav .navlink[aria-current=page]{color:#fff;background:color-mix(in srgb,var(--accent) 18%,transparent)}
@media (prefers-color-scheme:light){.nav .navlink[aria-current=page]{color:#1a1340}}
/* converters dropdown */
.menu{position:relative}
.menu summary{list-style:none;cursor:pointer;display:inline-flex;align-items:center;gap:5px;color:var(--text-muted);white-space:nowrap;padding:8px 12px;border-radius:9px;font-weight:500;user-select:none}
.menu summary::-webkit-details-marker{display:none}
.menu summary:hover{color:var(--text);background:var(--surface)}
.menu summary[aria-current=page]{color:#fff;background:color-mix(in srgb,var(--accent) 18%,transparent)}
@media (prefers-color-scheme:light){.menu summary[aria-current=page]{color:#1a1340}}
.menu[open] summary svg{transform:rotate(180deg)}
.menu summary svg{transition:.2s transform}
.menu-panel{position:absolute;right:0;top:calc(100% + 8px);background:var(--surface);border:1px solid var(--border-bright);border-radius:16px;box-shadow:var(--shadow);padding:14px;z-index:40;animation:menuIn .14s ease}
@keyframes menuIn{from{opacity:0;transform:translateY(-4px)}to{opacity:1;transform:none}}
.menu-panel.mega{display:grid;grid-template-columns:repeat(3,minmax(150px,1fr));gap:6px 18px}
.mega-col{display:grid;gap:2px;align-content:start}
.mega-col h5{margin:2px 8px 6px;font-family:var(--display);font-size:.72rem;letter-spacing:.1em;text-transform:uppercase;color:var(--text-dim);font-weight:600}
.menu-panel a{color:var(--text-muted);padding:8px 10px;border-radius:9px;font-weight:500;font-variant-numeric:tabular-nums;white-space:nowrap}
.menu-panel a:hover{color:var(--text);background:var(--surface-2)}
.menu-panel a[aria-current=page]{color:#fff;background:color-mix(in srgb,var(--accent) 20%,transparent)}
@media (prefers-color-scheme:light){.menu-panel a[aria-current=page]{color:#1a1340}}
.menu.lang summary{gap:6px}
.menu.lang .menu-panel{min-width:150px}
.lang-soon{padding:8px 10px;color:var(--text-dim);font-size:var(--small);display:flex;justify-content:space-between;align-items:center;gap:10px}
.lang-soon em{font-style:normal;font-size:.66rem;letter-spacing:.08em;text-transform:uppercase;border:1px solid var(--border);border-radius:6px;padding:2px 6px;color:var(--text-dim)}
@media (max-width:680px){
  .menu-panel.mega{grid-template-columns:1fr;right:auto;left:0;max-width:86vw;max-height:70vh;overflow:auto}
}

main{padding:38px 0 56px;position:relative}
.lead{color:var(--text-muted);font-size:1.1rem;max-width:60ch}

/* converter — the hero */
.converter{margin:26px 0 10px}
.dropzone{position:relative;border:1.5px dashed var(--border-bright);border-radius:var(--radius);
  background:linear-gradient(180deg,var(--surface),var(--bg-2));
  min-height:248px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:12px;text-align:center;padding:34px;cursor:pointer;
  transition:.2s border-color,.2s box-shadow,.2s transform,.2s background}
.dropzone:hover{border-color:var(--accent);box-shadow:var(--glow)}
.dropzone:focus-visible{outline:none;border-color:var(--accent);box-shadow:var(--glow)}
.dropzone.dragover{border-style:solid;border-color:var(--accent);background:linear-gradient(180deg,color-mix(in srgb,var(--accent) 12%,var(--surface)),var(--bg-2));box-shadow:var(--glow);transform:scale(1.006)}
.dropzone .dz-icon{width:52px;height:52px;color:#fff;padding:13px;border-radius:14px;background:var(--grad);box-shadow:0 10px 30px -8px var(--accent)}
.dropzone .dz-title{font-family:var(--display);font-weight:600;font-size:1.1rem}
.dropzone .dz-hint{color:var(--text-dim);font-size:var(--small)}

.controls{display:flex;align-items:center;gap:var(--gap);flex-wrap:wrap;margin:16px 0}
.quality{display:flex;align-items:center;gap:10px;font-size:var(--small);color:var(--text-muted)}
.quality input[type=range]{accent-color:var(--accent)}
.quality b{color:var(--text);min-width:2ch}
.btn{appearance:none;border:1px solid transparent;border-radius:var(--radius-sm);padding:11px 20px;font-size:1rem;font-family:var(--font);font-weight:600;cursor:pointer;background:var(--grad);color:#fff;box-shadow:0 10px 26px -10px var(--accent);transition:.16s transform,.16s box-shadow,.16s filter}
.btn:hover{transform:translateY(-1px);box-shadow:0 16px 34px -10px var(--accent)}
.btn:active{transform:translateY(0)}
.btn:disabled{opacity:.5;cursor:not-allowed;box-shadow:none;filter:saturate(.5)}
.btn.secondary{background:var(--surface);color:var(--text);border-color:var(--border-bright);box-shadow:none}
.btn.secondary:hover{border-color:var(--accent);color:#fff}
.btn.block{width:100%}

.filelist{list-style:none;margin:16px 0;padding:0;display:flex;flex-direction:column;gap:9px}
.fileitem{display:flex;align-items:center;gap:12px;border:1px solid var(--border);border-radius:12px;padding:11px 13px;background:var(--surface)}
.fileitem .thumb{width:42px;height:42px;border-radius:8px;object-fit:cover;background:var(--bg-2);flex:none}
.fileitem .meta{min-width:0;flex:1}
.fileitem .name{font-size:var(--small);font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.fileitem .sub{font-size:.78rem;color:var(--text-muted)}
.fileitem .sub b{color:var(--success)}
.fileitem .bar{height:5px;border-radius:3px;background:var(--bg-2);overflow:hidden;margin-top:5px}
.fileitem .bar>i{display:block;height:100%;width:0;background:var(--grad);transition:width .2s}
.fileitem.error{border-color:color-mix(in srgb,var(--danger) 50%,var(--border));background:var(--danger-soft)}
.fileitem.error .sub{color:var(--danger)}
.fileitem.done{border-color:color-mix(in srgb,var(--success) 35%,var(--border))}
.fileitem .act{margin-left:auto;display:flex;gap:6px;flex:none}
.iconbtn{border:1px solid var(--border-bright);background:var(--surface-2);border-radius:8px;width:36px;height:36px;display:grid;place-items:center;cursor:pointer;color:var(--text-muted);font-size:1rem}
.iconbtn:hover{color:#fff;border-color:var(--accent);box-shadow:0 0 0 3px color-mix(in srgb,var(--accent) 18%,transparent)}

/* trust strip */
.trust{display:flex;flex-wrap:wrap;gap:10px;justify-content:center;margin:18px 0 4px}
.trust span{display:inline-flex;align-items:center;gap:7px;font-size:var(--small);color:var(--text-muted);padding:7px 13px;border:1px solid var(--border);border-radius:999px;background:color-mix(in srgb,var(--surface) 60%,transparent)}
.trust svg{width:15px;height:15px;color:var(--accent-3)}

/* tool cards — deterministic columns (never an orphan 3+1) */
.cards{display:grid;grid-template-columns:repeat(var(--cols,4),minmax(0,1fr));gap:var(--gap);margin:20px 0}
@media (max-width:860px){.cards{grid-template-columns:repeat(2,1fr)}}
@media (max-width:480px){.cards{grid-template-columns:1fr}}
.card{position:relative;border:1px solid var(--border);border-radius:var(--radius);padding:20px;background:var(--surface);display:flex;flex-direction:column;gap:6px;transition:.18s transform,.18s border-color,.18s box-shadow;overflow:hidden}
.card .ic{width:38px;height:38px;border-radius:10px;display:grid;place-items:center;background:color-mix(in srgb,var(--accent) 14%,transparent);color:var(--accent);margin-bottom:6px}
.card:hover{transform:translateY(-3px);border-color:var(--accent);box-shadow:var(--glow);color:var(--text)}
.card h3{font-size:1.05rem}
.card p{margin:0;color:var(--text-muted);font-size:var(--small)}
.card .arrow{color:var(--text-dim);font-size:.85rem;margin-top:auto;padding-top:8px}
.card:hover .arrow{color:var(--accent)}

/* chips (compact tool/guide links) */
.chips{display:flex;flex-wrap:wrap;gap:9px;margin:14px 0}
.chip{font-size:var(--small);font-weight:500;color:var(--text-muted);padding:8px 14px;border:1px solid var(--border);border-radius:999px;background:var(--surface);font-variant-numeric:tabular-nums;transition:.15s}
.chip:hover{color:#fff;border-color:var(--accent);box-shadow:0 0 0 3px color-mix(in srgb,var(--accent) 14%,transparent)}
@media (prefers-color-scheme:light){.chip:hover{color:#1a1340}}

/* more tools (network hook) */
.more-tools{margin:22px 0;padding:15px 18px;border:1px solid var(--border);border-radius:var(--radius);background:linear-gradient(120deg,color-mix(in srgb,var(--accent) 8%,var(--surface)),var(--surface));font-size:var(--small);color:var(--text-muted);display:flex;align-items:center;gap:10px;justify-content:space-between;flex-wrap:wrap}
.more-tools a{color:var(--accent);font-weight:600}

/* steps */
.steps{list-style:none;counter-reset:s;padding:0;margin:14px 0;display:grid;gap:10px}
.steps li{counter-increment:s;position:relative;padding:14px 16px 14px 59px;border:1px solid var(--border);border-radius:14px;background:var(--surface);font-size:.95rem;color:var(--text);line-height:1.5}
.steps li::before{content:counter(s);position:absolute;left:16px;top:50%;transform:translateY(-50%);width:30px;height:30px;border-radius:9px;background:var(--grad);color:#fff;font-family:var(--display);font-weight:600;display:grid;place-items:center;font-size:.9rem}

/* faq */
.faq details{border:1px solid var(--border);border-radius:12px;padding:14px 16px;margin:9px 0;background:var(--surface);transition:.15s border-color}
.faq details[open]{border-color:var(--border-bright)}
.faq summary{cursor:pointer;font-weight:600;font-family:var(--display);list-style:none;display:flex;justify-content:space-between;align-items:center;gap:12px}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";color:var(--accent);font-size:1.3rem;line-height:1;transition:.2s transform}
.faq details[open] summary::after{transform:rotate(45deg)}
.faq details[open] summary{margin-bottom:8px}
.faq p{color:var(--text-muted);margin:0}

/* prose content — blocks span full content width; running text stays readable */
.prose{max-width:none}
.prose p{color:var(--text-muted);font-size:1.02rem;line-height:1.75;margin:.7em 0}
.prose>p{max-width:72ch}
.prose h2{margin-top:2em}
.prose h2:first-child{margin-top:.6em}
/* intro lead block: both paragraphs uniform, slightly larger, sits as a clean lead */
.intro p{color:var(--text);font-size:1.06rem;line-height:1.7}
.intro{margin:6px 0 8px;padding-left:16px;border-left:2px solid color-mix(in srgb,var(--accent) 45%,transparent);max-width:72ch}
.group-h{font-family:var(--display);font-size:.92rem;letter-spacing:.04em;color:var(--text-muted);margin:18px 0 2px;font-weight:600}

/* highlights row (visual feature cards under converter) */
.highlights{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:12px;margin:22px 0}
.highlight{border:1px solid var(--border);border-radius:14px;padding:16px;background:var(--surface);display:flex;flex-direction:column;gap:8px}
.highlight .hi{width:34px;height:34px;border-radius:10px;display:grid;place-items:center;background:color-mix(in srgb,var(--accent) 15%,transparent);color:var(--accent)}
.highlight b{font-family:var(--display);font-size:.96rem}
.highlight span{font-size:.82rem;color:var(--text-muted);line-height:1.5}

/* feature card grid (replaces plain bullet lists) — columns adapt to item count */
.feature-grid{display:grid;grid-template-columns:repeat(var(--cols,2),minmax(0,1fr));gap:12px;margin:14px 0}
@media (max-width:680px){.feature-grid{grid-template-columns:1fr}}
.feature{display:flex;gap:13px;align-items:center;border:1px solid var(--border);border-radius:14px;padding:14px 16px;background:var(--surface)}
.feature .fi{flex:none;width:30px;height:30px;border-radius:9px;display:grid;place-items:center;background:var(--grad);color:#fff;box-shadow:0 6px 16px -8px var(--accent)}
.feature .fi svg{width:16px;height:16px}
.feature p{margin:0;color:var(--text);font-size:.95rem;line-height:1.5}

/* callout */
.callout{border:1px solid var(--border-bright);border-left:3px solid var(--accent);border-radius:12px;padding:14px 16px;margin:16px 0;background:linear-gradient(120deg,color-mix(in srgb,var(--accent) 9%,var(--surface)),var(--surface));font-size:var(--small)}
.callout b{font-family:var(--display)}
.table-wrap{overflow-x:auto;margin:14px 0;border:1px solid var(--border);border-radius:12px}
table{width:100%;border-collapse:collapse;font-size:var(--small)}
th,td{text-align:left;padding:11px 14px;border-bottom:1px solid var(--border)}
thead th{font-family:var(--display);color:var(--text);background:var(--surface-2)}
tbody th[scope=row]{color:var(--text);font-weight:600}
tbody td{color:var(--text-muted)}
tr:last-child th,tr:last-child td{border-bottom:none}

/* closing CTA */
.cta{position:relative;margin:48px 0 8px;padding:40px 28px;border-radius:22px;text-align:center;overflow:hidden;border:1px solid var(--border-bright);background:linear-gradient(135deg,color-mix(in srgb,var(--accent) 18%,var(--surface)),color-mix(in srgb,var(--accent-2) 12%,var(--bg-2)))}
.cta h2{margin:0 0 8px}
.cta p{color:var(--text-muted);margin:0 0 18px}

/* ad slot */
.ad-slot{min-height:90px;border:1px dashed var(--border);border-radius:12px;display:grid;place-items:center;color:var(--text-dim);font-size:.72rem;letter-spacing:.05em;margin:30px 0;background:color-mix(in srgb,var(--surface) 40%,transparent)}

/* footer */
.site-footer{border-top:1px solid var(--border);background:var(--bg-2);padding:36px 0 24px;margin-top:40px;font-size:var(--small);color:var(--text-muted)}
.site-footer a{color:var(--text-muted)}
.site-footer a:hover{color:var(--text)}
.foot-cols{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:28px}
.foot-brand .brand{font-size:1.1rem;margin-bottom:10px}
.foot-brand p{max-width:34ch;color:var(--text-dim)}
.foot-col{display:flex;flex-direction:column;gap:9px}
.foot-col h4{font-family:var(--display);font-size:.8rem;letter-spacing:.08em;text-transform:uppercase;color:var(--text-dim);margin:2px 0 4px;font-weight:600}
.foot-base{margin-top:26px;padding-top:18px;border-top:1px solid var(--border);color:var(--text-dim)}
@media (max-width:640px){.foot-cols{grid-template-columns:1fr 1fr}.foot-brand{grid-column:1/-1}}

/* consent */
.consent{position:fixed;left:12px;right:12px;bottom:12px;z-index:50;max-width:760px;margin:0 auto;background:var(--surface);border:1px solid var(--border-bright);border-radius:var(--radius);box-shadow:var(--shadow);padding:15px 17px;display:flex;gap:12px;align-items:center;flex-wrap:wrap}
.consent p{margin:0;flex:1;min-width:220px;font-size:var(--small);color:var(--text-muted)}
.consent .acts{display:flex;gap:8px;flex-wrap:wrap}
.consent[hidden]{display:none}

.legal{font-size:1rem;max-width:70ch;line-height:1.7}
.legal p{color:var(--text-muted)}
.legal h2{font-size:1.15rem;margin-top:1.6em}
.notice{font-size:.82rem;color:var(--text-dim);margin-top:8px}

@media (max-width:560px){
  .nav{width:100%;margin-left:0;gap:4px;justify-content:flex-start;overflow-x:auto}
  .controls{flex-direction:column;align-items:stretch}
  .btn{width:100%}
  main{padding:24px 0 44px}
}