:root{--blue:#0966c5;--navy:#11385e;--ink:#163d68;--soft:#f1f7fd;--line:#cde0f2;--yellow:#f8d64e;--ok:#057a55;--danger:#b42318;font-family:Inter,Arial,sans-serif;color:var(--ink);background:var(--soft)}
*{box-sizing:border-box}body{margin:0;min-width:320px;background:linear-gradient(180deg,#edf6ff 0,#f7fbff 520px,#fff 520px);min-height:100vh}button,select{font:inherit}button{cursor:pointer}.site-header{height:72px;background:#fff;border-bottom:1px solid #d8e8f6;display:flex;align-items:center;justify-content:space-between;padding:0 28px;gap:18px;position:sticky;top:0;z-index:5}.brand{display:flex;align-items:center;gap:10px;color:var(--navy);font-weight:800;font-size:20px;text-decoration:none;white-space:nowrap}.brand img{height:36px;width:36px}.nav{display:flex;align-items:center;gap:20px}.nav a{color:#35577b;text-decoration:none;font-size:14px;font-weight:650}.language{height:37px;border:1px solid #a9c6e1;border-radius:8px;background:#fff;color:#173957;padding:0 29px 0 10px}.theme{width:43px;height:43px;border-radius:50%;background:var(--navy);color:#ffd94d;border:0;font-size:22px}.hero{max-width:1040px;margin:0 auto;padding:42px 24px 36px;text-align:center}.hero h1{font-size:42px;line-height:1.1;margin:0 0 13px;color:#0d4074;letter-spacing:-1.2px}.hero p{max-width:690px;margin:0 auto;color:#2d5d8d;font-size:16px;line-height:1.6}.upload-card{background:#fff;border:1px solid #c9dff1;border-radius:20px;padding:16px;margin:30px auto 0;box-shadow:0 10px 30px rgba(28,90,146,.06)}.dropzone{padding:34px 18px 28px;border:2px dashed #7db7ef;border-radius:16px;background:#f3f9ff;transition:.2s}.dropzone.drag{background:#e4f2ff;border-color:var(--blue)}.upload-icon{width:42px;height:42px;margin-bottom:8px;fill:var(--blue)}.primary{border:0;border-radius:9px;padding:13px 22px;background:linear-gradient(#1078df,#075cb7);color:#fff;font-weight:800;box-shadow:0 4px 7px rgba(0,84,170,.2)}.dropzone p{font-weight:750;margin:14px 0 8px}.dropzone small{display:block;color:#38648d;margin:8px}.dropzone .private{color:var(--ok);font-weight:700}.fineprint{display:flex;justify-content:center;gap:26px;flex-wrap:wrap;margin-top:18px;color:#426482;font-size:13px}.screen{display:none}.screen.active{display:block}.workspace-shell{max-width:1600px;margin:0 auto;padding:28px 16px 46px;display:grid;grid-template-columns:minmax(0,1fr) minmax(680px,1000px) minmax(0,1fr);gap:22px}.ad-space{min-height:620px}.workspace{display:grid;grid-template-columns:1fr 1.24fr 1fr;gap:14px;align-items:start}.panel{background:#fff;border:1px solid var(--line);border-radius:14px;box-shadow:0 8px 24px rgba(25,72,116,.05);overflow:hidden}.panel h2{font-size:16px;margin:0;padding:15px 16px;border-bottom:1px solid #e0edf8;color:#17446f}.panel-body{padding:16px}.file-row{border:1px solid #d5e5f3;border-radius:10px;padding:12px;margin-bottom:12px;background:#f9fcff}.file-name{display:block;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-weight:750;color:#17446f}.file-meta{margin-top:7px;font-size:12px;color:#5f7e99}.secondary{border:1px solid #9cbfe0;border-radius:8px;background:#fff;color:#14588d;padding:9px 11px;font-weight:700}.preview-empty,.preview-frame{height:505px;border:1px dashed #a9c9e5;border-radius:9px;background:#f6faff;display:flex;align-items:center;justify-content:center;color:#6685a0;text-align:center;padding:20px}.preview-frame{padding:0;overflow:hidden}.preview-frame embed{height:100%;width:100%;border:0}.field{margin-bottom:16px}.field label{display:block;font-size:12px;font-weight:800;color:#436a8f;margin-bottom:6px}.field select{width:100%;border:1px solid #abc9e3;border-radius:8px;padding:10px;background:#fff;color:#1c496f}.mode-note{font-size:12px;line-height:1.45;color:#55748d;background:#f3f9ff;border-radius:8px;padding:10px}.convert{width:100%;margin-top:8px;padding:13px}.progress{display:none;margin-top:16px;font-size:13px;color:#315f89}.progress.show{display:block}.bar{height:7px;border-radius:99px;background:#e0edf7;margin:7px 0;overflow:hidden}.bar i{display:block;width:35%;height:100%;background:var(--blue);border-radius:inherit;animation:load 1.4s infinite ease-in-out}@keyframes load{50%{width:85%;margin-left:10%}}.notice{display:none;margin:0 auto 18px;max-width:1000px;padding:12px 16px;border-radius:9px;font-size:14px}.notice.show{display:block}.notice.error{background:#fff0ef;color:var(--danger);border:1px solid #ffd0cb}.notice.success{background:#ecfdf3;color:#05603a;border:1px solid #b8ebcf}.footer{background:#11385e;color:#fff;padding:14px 28px;display:grid;grid-template-columns:1fr 1.25fr;gap:28px;font-size:12px}.footer a{color:#fff;text-decoration:none;font-weight:700;margin-right:12px}.footer strong{display:block;color:var(--yellow);font-size:13px;margin:3px 0}.footer .network{color:#d3e7f9}.footer .network a{color:var(--yellow);margin-right:9px}.footer .links{margin-top:8px}.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0)}body.dark{--soft:#0f1d2b;--ink:#d8e9f8;--navy:#d6eafe;background:#101c29}.dark .site-header,.dark .panel,.dark .upload-card{background:#152638;border-color:#2a4c69}.dark .brand,.dark .hero h1,.dark .panel h2,.dark .file-name{color:#e4f1fb}.dark .nav a,.dark .hero p,.dark .field label{color:#b7d1e7}.dark .dropzone,.dark .preview-empty{background:#162d42}.dark .file-row{background:#19344b;border-color:#315875}.dark .language,.dark .field select,.dark .secondary{background:#163149;color:#e4f1fb;border-color:#427297}.dark .mode-note{background:#1b3850;color:#cbe0f0}@media(max-width:1050px){.workspace-shell{grid-template-columns:1fr}.ad-space{display:none}.workspace{max-width:1000px;margin:auto}}@media(max-width:760px){.site-header{height:auto;padding:12px 15px;align-items:flex-start}.brand{font-size:17px}.nav{gap:8px;flex-wrap:wrap;justify-content:flex-end}.nav a{display:none}.language{width:112px}.hero{padding:32px 16px}.hero h1{font-size:32px}.workspace{grid-template-columns:1fr}.preview-empty,.preview-frame{height:370px}.footer{grid-template-columns:1fr;padding:18px}.footer .network{line-height:1.8}}