:root{
  --ink:#1d2b3a; --sub:#5b6b7c; --bg:#f2f5f8; --card:#ffffff;
  --accent:#0f7f7f; --accent-2:#0a6363; --line:#dde5ec; --warn:#b4690e; --err:#b3402a;
}
*{box-sizing:border-box;margin:0;padding:0}
body{font-family:"Microsoft YaHei","PingFang SC",system-ui,sans-serif;background:var(--bg);color:var(--ink);min-height:100vh}
header{background:linear-gradient(135deg,#123f4a,#0f7f7f);color:#fff;padding:28px 20px}
header .wrap{max-width:1080px;margin:0 auto}
header h1{font-size:24px;letter-spacing:1px}
header p{margin-top:8px;font-size:14px;opacity:.85;line-height:1.7}
.brand{display:flex;align-items:center;gap:18px}
.brand-logo{height:56px;width:auto;flex:none;background:#fff;border-radius:12px;padding:6px 14px}
main{max-width:1080px;margin:24px auto 48px;padding:0 20px;display:grid;grid-template-columns:420px 1fr;gap:20px;align-items:start}
.card{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:20px}
.card h2{font-size:16px;margin-bottom:14px;padding-left:10px;border-left:4px solid var(--accent)}
.drop{border:2px dashed #9db8c2;border-radius:10px;padding:34px 16px;text-align:center;cursor:pointer;transition:.2s;background:#f8fbfc}
.drop:hover,.drop.over{border-color:var(--accent);background:#eef7f7}
.drop .big{font-size:15px;font-weight:600}
.drop .small{font-size:12px;color:var(--sub);margin-top:6px;line-height:1.7}
.fileinfo{margin-top:12px;font-size:13px;color:var(--sub);line-height:1.8;word-break:break-all}
.opts{margin-top:14px;display:grid;grid-template-columns:1fr;gap:10px;font-size:13px}
.opts label{display:flex;flex-direction:column;gap:4px;color:var(--sub)}
.opts select{padding:9px;border:1px solid var(--line);border-radius:6px;font-size:16px;background:#fff;color:var(--ink)}
.btn{display:inline-block;border:0;border-radius:8px;padding:11px 22px;font-size:14px;cursor:pointer;font-weight:600;transition:.15s}
.btn-primary{background:var(--accent);color:#fff}
.btn-primary:hover{background:var(--accent-2)}
.btn:disabled{background:#c5d2da;cursor:not-allowed;color:#fff}
.btn-ghost{background:#fff;border:1px solid var(--accent);color:var(--accent)}
.btn-ghost:hover{background:#eef7f7}
.actions{margin-top:16px;display:flex;gap:10px;flex-wrap:wrap}
.bar{height:8px;background:#e8eef3;border-radius:4px;overflow:hidden;margin-top:14px;display:none}
.bar i{display:block;height:100%;width:0;background:var(--accent);transition:width .2s}
#status{margin-top:10px;font-size:13px;line-height:1.8;color:var(--sub);min-height:22px}
#status.err{color:var(--err)} #status.warn{color:var(--warn)}
.thumbs{display:grid;grid-template-columns:repeat(auto-fill,minmax(120px,1fr));gap:12px;margin-top:8px}
.thumb{position:relative;border:1px solid var(--line);border-radius:8px;overflow:hidden;background:#f6f8fa;text-align:center}
.thumb img{width:100%;display:block;aspect-ratio:1/1.414;object-fit:contain;background:#fff}
.thumb span{position:absolute;left:6px;top:6px;background:rgba(15,127,127,.88);color:#fff;font-size:11px;padding:2px 7px;border-radius:10px}
.empty{color:var(--sub);font-size:13px;line-height:1.9;text-align:center;padding:30px 10px}
.srcpv{display:grid;grid-template-columns:repeat(2,1fr);gap:10px;margin-top:14px}
.srcpv .ttl{grid-column:1/-1;font-size:13px;font-weight:600;color:var(--sub)}
.srcpv img{aspect-ratio:1.414/1;object-fit:contain;background:#fff}
.srcpv .empty{grid-column:1/-1}
.author{max-width:1080px;margin:0 auto 32px;padding:0 20px;text-align:center;font-size:13px;color:var(--sub);line-height:1.9}
.author a{color:var(--accent);text-decoration:none}
.author a:hover{text-decoration:underline}
@media (max-width:900px){main{grid-template-columns:1fr;margin:16px auto 32px}}
@media (max-width:640px){
  header{padding:20px 14px}
  header h1{font-size:20px}
  header p{font-size:13px}
  .brand{flex-direction:column;align-items:flex-start;gap:12px}
  .brand-logo{height:40px}
  main{padding:0 12px;gap:14px}
  .card{padding:16px}
  .btn{width:100%;padding:14px 16px;font-size:16px}
  .actions{flex-direction:column}
  .opts{grid-template-columns:1fr}
  .drop{padding:26px 12px}
  .thumbs{grid-template-columns:repeat(auto-fill,minmax(96px,1fr));gap:8px}
  .author{padding:0 14px;font-size:12px}
}