:root{
  color-scheme:light;
  --bg:#f4f7fb;
  --surface:#ffffff;
  --surface-soft:#f8fafc;
  --surface-muted:#eef2f6;
  --text:#4f5d70;
  --heading:#0e1623;
  --muted:#657488;
  --line:#e3e8ef;
  --line-strong:#d7deea;
  --accent:#465dc6;
  --accent-strong:#3d51b2;
  --accent-soft:#edf1ff;
  --accent-ink:#ffffff;
  --shadow:0 22px 56px rgba(15,23,38,.06);
  --shadow-soft:0 10px 28px rgba(15,23,38,.035);
  --radius:30px;
  --radius-md:24px;
  --radius-sm:18px;
  --container:1080px;
  --content:760px;
}
html[data-theme="dark"]{
  color-scheme:dark;
  --bg:#0a0f16;
  --surface:#121923;
  --surface-soft:#151d28;
  --surface-muted:#0f1620;
  --text:#b0bccb;
  --heading:#f4f7fb;
  --muted:#9eabbb;
  --line:#233244;
  --line-strong:#2b3c50;
  --accent:#94a7ff;
  --accent-strong:#aab8ff;
  --accent-soft:rgba(148,167,255,.12);
  --accent-ink:#0a0f16;
  --shadow:0 28px 72px rgba(0,0,0,.34);
  --shadow-soft:0 12px 30px rgba(0,0,0,.24);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font:400 17px/1.74 "Segoe UI Variable Text","Inter","Segoe UI",system-ui,-apple-system,BlinkMacSystemFont,Roboto,Arial,sans-serif;
  background:var(--bg);
  color:var(--text);
  text-rendering:optimizeLegibility;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
}
a{color:inherit;text-decoration:none}
img{display:block;max-width:100%}
button,input{font:inherit}
button{cursor:pointer}
.container{width:min(100% - 40px, var(--container));margin:0 auto}
.content{width:min(100%, var(--content))}
h1,h2,h3,strong,.brand-name,.btn,.format-btn,.faq-item summary{color:var(--heading)}
p,li,.footer-copy,.header-link,.micro-note,.status,.message,.dropzone-copy span,.preview-copy span,.section-head p,.article p,.article li,.faq-item p,.guide-card p,.plain-item p,.support-note p{color:var(--muted)}
.site-header{
  position:sticky;top:0;z-index:20;padding:18px 0 12px;
  background:color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter:saturate(140%) blur(10px);
}
.header-inner{display:flex;align-items:center;justify-content:space-between;gap:18px}
.brand{display:inline-flex;align-items:center;gap:13px;font-weight:800;letter-spacing:-.03em}
.brand-mark{
  width:42px;height:42px;display:grid;place-items:center;border:1px solid var(--line);
  border-radius:15px;background:linear-gradient(180deg,var(--surface),var(--surface-soft));
  box-shadow:0 1px 0 rgba(255,255,255,.62) inset,var(--shadow-soft)
}
html[data-theme="dark"] .brand-mark{box-shadow:0 1px 0 rgba(255,255,255,.05) inset,var(--shadow-soft)}
.brand-mark svg{width:25px;height:25px}
.brand-name{font-size:1.02rem}
.header-nav{display:flex;align-items:center;gap:14px}
.header-link{font-size:14px}
.header-link:hover{color:var(--heading)}
.theme-toggle{
  width:42px;height:42px;border-radius:14px;border:1px solid var(--line);
  background:linear-gradient(180deg,var(--surface),var(--surface-soft));display:grid;place-items:center;color:var(--text)
}
.theme-toggle svg{width:18px;height:18px}
.site-main{padding:16px 0 110px}
.hero{padding-top:24px}
.hero-wrap{display:grid;gap:42px;align-items:start}
.hero h1{
  margin:0;max-width:10.5ch;font-size:clamp(2.6rem,6vw,4.9rem);
  line-height:.96;letter-spacing:-.065em;font-family:"Segoe UI Variable Display","Inter Tight","Segoe UI",system-ui,sans-serif
}
.hero p{margin:18px 0 0;max-width:60ch;font-size:clamp(1.02rem,1.9vw,1.14rem)}
.eyebrow{font-size:12px;letter-spacing:.12em;text-transform:uppercase;color:var(--muted);margin:0 0 14px}
.hero-trust,.tool-meta,.support-strip,.link-cloud{
  display:flex;flex-wrap:wrap;align-items:center;gap:12px;margin-top:24px
}
.hero-trust span,.meta-chip,.support-strip span,.link-cloud a{
  display:inline-flex;align-items:center;justify-content:center;min-height:40px;padding:10px 14px;
  border-radius:999px;border:1px solid var(--line-strong);background:color-mix(in srgb,var(--surface) 92%, var(--accent-soft) 8%);
  color:var(--heading);font-size:14px;line-height:1.2
}
.hero-grid{grid-template-columns:minmax(0,1fr) minmax(340px,480px)}
.section{margin-top:120px}
.section-quiet{margin-top:96px}
.section > .content,.section > .container > .content{display:grid;gap:32px}
.section-head{display:grid;gap:10px}
.section-head.compact{gap:8px}
.section-head h2{margin:0;font-size:clamp(1.5rem,2.2vw,1.95rem);letter-spacing:-.045em}
.section-head p{margin:0;max-width:62ch}
.tool-shell{
  background:linear-gradient(180deg,var(--surface),var(--surface-soft));
  border:1px solid var(--line);border-radius:34px;box-shadow:0 1px 0 rgba(255,255,255,.68) inset,var(--shadow);
  padding:26px
}
html[data-theme="dark"] .tool-shell{box-shadow:0 1px 0 rgba(255,255,255,.04) inset,var(--shadow)}
.tool-shell[data-ready="true"]{box-shadow:0 1px 0 rgba(255,255,255,.68) inset,0 28px 72px rgba(15,23,38,.09)}
html[data-theme="dark"] .tool-shell[data-ready="true"]{box-shadow:0 1px 0 rgba(255,255,255,.04) inset,0 28px 72px rgba(0,0,0,.36)}
.tool-shell[data-busy="true"]{opacity:.98}
.tool-shell[data-busy="true"] .dropzone{box-shadow:none}
.tool-meta{margin-top:0;margin-bottom:18px}
.tool-top{display:grid;gap:18px}
.dropzone{
  display:grid;gap:18px;padding:28px;border:1px solid var(--line-strong);border-radius:24px;
  background:linear-gradient(180deg,var(--surface-soft),var(--surface-muted));
  transition:border-color .16s ease, background .16s ease, transform .16s ease, box-shadow .16s ease
}
.dropzone.is-dragover{border-color:var(--accent);background:color-mix(in srgb,var(--surface-soft) 84%, var(--accent) 16%);transform:translateY(-1px);box-shadow:var(--shadow-soft)}
.dropzone-copy{display:grid;gap:8px}
.dropzone-copy strong{font-size:1.08rem;letter-spacing:-.02em}
.dropzone-actions{display:flex;gap:12px;flex-wrap:wrap}
.preview{display:none;grid-template-columns:88px 1fr;gap:18px;align-items:center;padding-top:4px}

.batch-list{display:none;gap:10px;padding-top:6px}
.batch-list.is-visible{display:grid}
.batch-item{
  display:grid;grid-template-columns:72px minmax(0,1fr) auto;gap:14px;align-items:center;
  padding:14px;border:1px solid var(--line);border-radius:22px;
  background:linear-gradient(180deg,var(--surface),color-mix(in srgb,var(--surface) 82%, var(--surface-soft) 18%));
  box-shadow:0 1px 0 rgba(255,255,255,.6) inset,var(--shadow-soft)
}
html[data-theme="dark"] .batch-item{box-shadow:0 1px 0 rgba(255,255,255,.04) inset,var(--shadow-soft)}
.batch-item.is-ready{border-color:color-mix(in srgb,var(--accent) 20%, var(--line-strong) 80%)}
.batch-item.has-error{border-color:rgba(190,80,80,.4);background:linear-gradient(180deg,var(--surface),rgba(190,80,80,.05))}
.batch-thumb{
  width:72px;height:72px;border-radius:18px;overflow:hidden;border:1px solid var(--line);position:relative;
  background:var(--surface-muted);display:grid;place-items:center;box-shadow:0 1px 0 rgba(255,255,255,.55) inset
}
.batch-thumb img{width:100%;height:100%;object-fit:cover}
.remove-item-btn{
  position:absolute;top:6px;right:6px;width:28px;height:28px;border-radius:999px;border:1px solid rgba(255,255,255,.22);
  background:rgba(10,15,22,.76);color:#fff;display:inline-flex;align-items:center;justify-content:center;font-size:18px;line-height:1;
  box-shadow:0 8px 20px rgba(10,15,22,.18);backdrop-filter:blur(4px)
}
.remove-item-btn:hover:not(:disabled){transform:translateY(-1px)}
.remove-item-btn:disabled{opacity:.42;cursor:not-allowed}
.remove-item-btn:focus-visible{outline-offset:1px}
.dropzone.is-disabled{opacity:.76;cursor:not-allowed}
.batch-copy{display:grid;gap:6px;min-width:0}
.batch-copy strong{
  font-size:.99rem;line-height:1.35;letter-spacing:-.02em;min-width:0;display:-webkit-box;
  -webkit-box-orient:vertical;-webkit-line-clamp:2;overflow:hidden
}
.batch-copy span{font-size:14px;color:var(--muted);line-height:1.45}
.batch-actions{display:flex;align-items:center;gap:10px;flex-wrap:wrap;justify-content:flex-end}
.item-link{
  display:none;min-height:44px;padding:10px 16px;border-radius:14px;background:var(--accent);color:var(--accent-ink);
  font-weight:800;font-size:14px;box-shadow:var(--shadow-soft);white-space:nowrap
}
.item-link.is-visible{display:inline-flex;align-items:center;justify-content:center}
.item-state{font-size:13px;color:var(--muted)}

.preview.is-visible{display:grid}
.preview-media{
  width:88px;height:88px;border-radius:22px;overflow:hidden;border:1px solid var(--line);
  background:var(--surface-muted);display:grid;place-items:center;box-shadow:0 1px 0 rgba(255,255,255,.55) inset
}
.preview-media img{width:100%;height:100%;object-fit:cover}
.preview-copy strong{display:block;font-size:1rem;letter-spacing:-.02em}
.preview-copy span{display:block;margin-top:7px}
.controls{display:none;margin-top:24px;padding-top:24px;border-top:1px solid var(--line)}
.controls.is-visible{display:grid;gap:22px}
.control-label{font-size:12px;letter-spacing:.12em;text-transform:uppercase;color:var(--muted);margin:0 0 12px}
.format-row{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:8px;padding:6px;border-radius:20px;border:1px solid var(--line);background:var(--surface-muted)}
.format-btn{min-height:50px;border-radius:14px;border:0;background:transparent;color:var(--heading);font-weight:800;box-shadow:none}
.format-btn[aria-pressed="true"]{background:var(--surface);box-shadow:0 1px 0 rgba(255,255,255,.7) inset,var(--shadow-soft)}
.format-btn:disabled{opacity:.38;cursor:not-allowed}
.quality{display:none;gap:12px;padding:18px;border-radius:22px;background:var(--surface-muted);border:1px solid var(--line)}
.quality.is-visible{display:grid}
.quality-head{display:flex;align-items:center;justify-content:space-between;gap:12px}
input[type="range"]{width:100%;accent-color:var(--accent)}
.result-row{display:flex;gap:12px;flex-wrap:wrap}
.result-row .btn,.result-row .download-link{flex:1 1 172px}
.btn,.download-link{
  appearance:none;border:0;border-radius:18px;min-height:54px;padding:14px 18px;
  display:inline-flex;align-items:center;justify-content:center;gap:8px;font-weight:800;letter-spacing:-.02em;
  transition:transform .16s ease, background .16s ease, border-color .16s ease, box-shadow .16s ease, opacity .16s ease
}
.btn:hover:not(:disabled),.download-link:hover{transform:translateY(-1px)}
.btn:disabled{opacity:.46;cursor:not-allowed}
.btn-primary{background:var(--heading);color:var(--bg);box-shadow:var(--shadow-soft)}
.btn-secondary{background:var(--surface);color:var(--heading);border:1px solid var(--line)}
.btn-ghost{background:transparent;color:var(--muted);padding:8px 0;min-height:auto;border-radius:0;font-weight:700}
.download-link{display:none;background:var(--accent);color:var(--accent-ink);text-align:center;box-shadow:var(--shadow-soft)}
.download-link.is-visible{display:inline-flex}
.status{margin:0;font-size:15px}
.message{display:none;margin:0;padding:14px 15px;border-radius:16px;border:1px solid var(--line);background:var(--surface-muted)}
.message.is-visible{display:block}
.message.is-error{border-color:#cf9292;background:rgba(190,80,80,.08)}
.micro-note{margin:0;font-size:14px}
.plain-list{display:grid;gap:0;border-top:1px solid var(--line)}
.plain-item{display:grid;grid-template-columns:140px 1fr;gap:20px;padding:22px 0;border-bottom:1px solid var(--line)}
.plain-item strong{font-size:1rem;letter-spacing:-.02em}
.plain-item p{margin:0}
.split-surface{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:52px;align-items:start}
.stack-sm{display:grid;gap:18px}
.support-note{padding:0 0 0 16px;border-left:2px solid var(--line-strong)}
.support-note p{margin:0}
.guide-list{display:grid;gap:0;border-top:1px solid var(--line)}
.guide-card,.guide-row{
  display:grid;gap:8px;padding:24px 0;border:0;border-bottom:1px solid var(--line);
  background:none;box-shadow:none;border-radius:0;position:relative
}
.guide-card::before{display:none}
.guide-card:hover,.guide-row:hover{transform:none}
.guide-card h3,.guide-row h3{margin:0;font-size:1.14rem;letter-spacing:-.03em;max-width:38ch}
.guide-card p,.guide-row p{margin:0;max-width:64ch}
.guide-row .row-meta{font-size:13px;letter-spacing:.08em;text-transform:uppercase;color:var(--muted)}
.faq-list,.faq-plain{display:grid;gap:0;border-top:1px solid var(--line)}
.faq-item{padding:20px 0;border:0;border-bottom:1px solid var(--line);background:none;box-shadow:none;border-radius:0}
.faq-item summary{cursor:pointer;list-style:none;font-size:1rem;display:flex;align-items:center;justify-content:space-between;gap:16px}
.faq-item summary::after{content:'+';font-size:1.1rem;color:var(--muted)}
.faq-item[open] summary::after{content:'−'}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item p{margin:14px 0 0;max-width:66ch}
.article{display:grid;gap:28px}
.article section,.article .article-surface{
  padding:32px;border:1px solid var(--line);background:linear-gradient(180deg,var(--surface),color-mix(in srgb,var(--surface) 78%, var(--surface-soft) 22%));
  border-radius:28px;box-shadow:0 1px 0 rgba(255,255,255,.65) inset,var(--shadow-soft)
}
html[data-theme="dark"] .article section,html[data-theme="dark"] .article .article-surface{box-shadow:0 1px 0 rgba(255,255,255,.04) inset,var(--shadow-soft)}
.article h2{margin:0 0 12px;font-size:clamp(1.36rem,2vw,1.78rem);letter-spacing:-.04em}
.article h3{margin:0 0 10px;font-size:1.12rem;letter-spacing:-.03em}
.article p,.article li{margin:0}
.article ul{margin:16px 0 0;padding-left:20px}
.article li+li{margin-top:8px}
.breadcrumbs{display:flex;gap:8px;flex-wrap:wrap;font-size:14px;color:var(--muted);margin-bottom:12px}
.breadcrumbs span{opacity:.6}
.site-footer{padding:36px 0 44px;border-top:1px solid var(--line);margin-top:40px}
.footer-inner{display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap}
.footer-copy{margin:0;font-size:14px}
.footer-links{display:flex;gap:14px;flex-wrap:wrap;font-size:14px;color:var(--muted)}
.footer-links a:hover{color:var(--heading)}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
:focus-visible{outline:3px solid color-mix(in srgb,var(--accent) 70%, white 30%);outline-offset:2px}
@media (max-width:920px){
  .hero-grid,.split-surface{grid-template-columns:1fr}
}
@media (max-width:720px){
  .batch-item{grid-template-columns:60px minmax(0,1fr);align-items:start;padding:12px 12px 14px;border-radius:20px}
  .batch-thumb{width:60px;height:60px;border-radius:16px}
  .batch-copy{padding-top:2px}
  .batch-copy strong{font-size:.96rem}
  .batch-copy span{font-size:13px}
  .batch-actions{grid-column:1 / -1;justify-content:flex-start;padding-left:72px;margin-top:4px}
  .item-link{width:100%;max-width:none}

  body{font-size:16px;line-height:1.72}
  .container{width:min(100% - 24px, var(--container))}
  .site-header{padding-top:14px}
  .header-link{display:none}
  .site-main{padding-bottom:80px}
  .hero{padding-top:18px}
  .hero-wrap{gap:28px}
  .hero h1{max-width:none}
  .hero-trust,.tool-meta,.support-strip,.link-cloud{gap:10px;margin-top:20px}
  .hero-trust span,.meta-chip,.support-strip span,.link-cloud a{min-height:38px;padding:9px 13px;font-size:13px}
  .section{margin-top:92px}
  .section-quiet{margin-top:78px}
  .tool-shell{padding:18px;border-radius:26px}
  .dropzone{padding:20px;border-radius:20px}
  .preview{grid-template-columns:76px 1fr}
  .preview-media{width:76px;height:76px;border-radius:18px}
  .controls{gap:18px}
  .format-row{grid-template-columns:1fr}
  .btn,.download-link{width:100%}
  .plain-item{grid-template-columns:1fr;gap:8px;padding:18px 0}
  .article section,.article .article-surface{padding:22px}
}


.hero-home-grid{display:grid;grid-template-columns:minmax(0,1fr) minmax(340px,480px);gap:56px;align-items:start}
.home-copy{padding-top:18px}
.home-copy h1{max-width:12ch}
.hero-inline-meta{display:flex;flex-wrap:wrap;gap:18px;margin-top:22px;color:var(--heading);font-size:14px;font-weight:650}
.hero-inline-meta span{position:relative;padding-left:14px}
.hero-inline-meta span::before{content:'';position:absolute;left:0;top:50%;width:5px;height:5px;border-radius:999px;background:color-mix(in srgb,var(--accent) 70%, var(--heading) 30%);transform:translateY(-50%)}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:26px}
.hero-actions-inline{margin-top:22px}
.hero-actions .btn{min-width:154px}
.hero-note{margin:18px 0 0;font-size:14px;color:var(--muted)}
.tool-shell-home{padding:28px;border-radius:36px}
.home-grid-two{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:24px;align-items:start}
.surface-panel{padding:30px;border:1px solid var(--line);border-radius:30px;background:linear-gradient(180deg,var(--surface),color-mix(in srgb,var(--surface) 84%, var(--surface-soft) 16%));box-shadow:0 1px 0 rgba(255,255,255,.68) inset,var(--shadow-soft)}
html[data-theme="dark"] .surface-panel{box-shadow:0 1px 0 rgba(255,255,255,.04) inset,var(--shadow-soft)}
.link-cloud-compact{margin-top:18px}
.home-plain-list{border-top:0}
.home-plain-list .plain-item:first-child{padding-top:0}
.home-plain-list .plain-item:last-child{padding-bottom:0}
.guide-list-compact{border-top:0}
.guide-list-compact .guide-card:first-child,.faq-list-compact .faq-item:first-child{padding-top:0}
.guide-list-compact .guide-card:last-child,.faq-list-compact .faq-item:last-child{padding-bottom:0}
.article-summary{padding:30px;border-radius:28px}
.article-summary p{margin:0;font-size:1.04rem;color:var(--heading)}
@media (max-width:920px){
  .hero-home-grid,.home-grid-two{grid-template-columns:1fr}
}
@media (max-width:720px){
  .hero-home-grid{gap:26px}
  .tool-shell-home{padding:18px;border-radius:26px}
  .surface-panel{padding:22px;border-radius:24px}
  .hero-inline-meta{gap:12px;font-size:13px}
  .hero-actions{margin-top:22px}
  .hero-actions .btn{min-width:0}
}


/* v11 home simplification */
.hero-home-minimal{padding-top:26px}
.home-minimal-wrap{display:grid;gap:26px;max-width:920px}
.home-minimal-copy{display:grid;gap:0;padding-top:6px}
.home-minimal-copy h1{max-width:none;font-size:clamp(2.6rem,6vw,4.6rem)}
.home-minimal-copy p{margin-top:16px;max-width:48ch;font-size:clamp(1rem,1.8vw,1.08rem)}
.tool-shell-home-minimal{max-width:920px;padding:24px 24px 22px;border-radius:32px}
.tool-shell-home-minimal .tool-top{gap:16px}
.tool-shell-home-minimal .controls{margin-top:20px;padding-top:20px}
.home-minimal-links{display:flex;flex-wrap:wrap;gap:16px 18px;padding:2px 2px 0;color:var(--muted);font-size:14px}
.home-minimal-links a{color:var(--muted)}
.home-minimal-links a:hover{color:var(--heading)}
@media (max-width:720px){
  .hero-home-minimal{padding-top:14px}
  .home-minimal-wrap{gap:20px}
  .home-minimal-copy p{margin-top:14px;max-width:none}
  .tool-shell-home-minimal{padding:16px 16px 18px;border-radius:24px}
  .home-minimal-links{gap:12px 14px;font-size:13px}
}