:root{--bg:#f6f7fb;--surface:#fff;--surface-2:#f0f2f8;--text:#171923;--muted:#667085;--border:#dfe3ec;--primary:#6d4aff;--primary-2:#5636df;--danger:#c73535;--success:#16855b;--shadow:0 18px 60px rgba(25,25,55,.1);color-scheme:light}
[data-theme="dark"]{--bg:#0f1118;--surface:#181b25;--surface-2:#222633;--text:#f5f6fb;--muted:#a6adbd;--border:#313747;--primary:#8e75ff;--primary-2:#a18cff;--danger:#ff7b7b;--success:#5bd3a7;--shadow:0 20px 60px rgba(0,0,0,.35);color-scheme:dark}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:radial-gradient(circle at 50% -10%,rgba(109,74,255,.14),transparent 35%),var(--bg);color:var(--text);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;line-height:1.6}.site-header{max-width:1180px;margin:auto;padding:22px 24px;display:flex;align-items:center;justify-content:space-between}.brand{display:flex;align-items:center;gap:10px;color:var(--text);font-weight:800;text-decoration:none;font-size:1.08rem}.brand-mark{width:38px;height:38px;border-radius:12px;display:grid;place-items:center;color:#fff;background:linear-gradient(135deg,var(--primary),#b44cff);font-size:.78rem;box-shadow:0 8px 24px rgba(109,74,255,.3)}.icon-button,.text-button,.secondary-button,.primary-button{font:inherit;cursor:pointer}.icon-button{width:42px;height:42px;border-radius:50%;border:1px solid var(--border);background:var(--surface);color:var(--text);font-size:1.2rem}.hero{text-align:center;max-width:780px;margin:56px auto 36px;padding:0 20px}.eyebrow,.label{color:var(--primary);font-weight:800;font-size:.75rem;letter-spacing:.11em;text-transform:uppercase}.hero h1{font-size:clamp(2.5rem,6vw,4.5rem);line-height:1.05;margin:12px 0 18px;letter-spacing:-.055em}.hero p{font-size:1.13rem;color:var(--muted);margin:auto;max-width:650px}.converter-shell{max-width:1040px;margin:0 auto;padding:24px;background:var(--surface);border:1px solid var(--border);border-radius:28px;box-shadow:var(--shadow)}.drop-zone{min-height:330px;border:2px dashed #b8b0ed;border-radius:20px;background:linear-gradient(180deg,rgba(109,74,255,.055),transparent);display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;padding:30px;transition:.2s}.drop-zone:hover,.drop-zone:focus,.drop-zone.dragover{border-color:var(--primary);background:rgba(109,74,255,.09);outline:none;transform:translateY(-2px)}.upload-icon{width:64px;height:64px;border-radius:20px;display:grid;place-items:center;background:var(--primary);color:#fff;font-size:2rem;margin-bottom:18px;box-shadow:0 12px 32px rgba(109,74,255,.3)}.drop-zone strong{font-size:1.35rem}.drop-zone span,.drop-zone small{color:var(--muted)}.drop-zone small{margin-top:14px}.workspace{display:grid;grid-template-columns:1.1fr .9fr;gap:24px}.preview-panel,.settings-panel{border:1px solid var(--border);border-radius:20px;padding:20px;background:var(--surface)}.panel-heading{display:flex;align-items:flex-start;justify-content:space-between;gap:16px;margin-bottom:16px}.panel-heading h3{margin:3px 0 0;font-size:1.1rem;overflow-wrap:anywhere}.text-button{border:0;background:none;color:var(--primary);font-weight:700;padding:5px}.text-button.danger{color:var(--danger)}video{display:block;width:100%;max-height:430px;border-radius:14px;background:#000}.file-meta{display:flex;flex-wrap:wrap;gap:8px;margin-top:12px}.file-meta span{padding:5px 9px;border-radius:8px;background:var(--surface-2);font-size:.78rem;color:var(--muted)}.settings-panel{display:flex;flex-direction:column;gap:17px}.settings-panel>label,.form-grid label{display:flex;flex-direction:column;gap:7px;font-size:.9rem;font-weight:700}.form-grid{display:grid;gap:12px}.two-columns{grid-template-columns:1fr 1fr}.input-unit{display:flex;align-items:center;border:1px solid var(--border);border-radius:11px;background:var(--surface)}.input-unit input{width:100%;border:0;background:transparent;color:var(--text);padding:11px 12px;font:inherit;outline:0}.input-unit span{padding:0 11px;color:var(--muted);font-size:.82rem}select{width:100%;padding:11px 12px;border:1px solid var(--border);border-radius:11px;background:var(--surface);color:var(--text);font:inherit}.range-row{display:flex;align-items:center;gap:12px}.range-row input{width:100%;accent-color:var(--primary)}output{min-width:68px;text-align:center;padding:6px 8px;background:var(--surface-2);border-radius:8px;font-size:.8rem}.segmented{display:grid;grid-template-columns:repeat(4,1fr);gap:7px}.segmented label{cursor:pointer}.segmented input{position:absolute;opacity:0}.segmented span{display:block;text-align:center;padding:8px 3px;border:1px solid var(--border);border-radius:9px;font-size:.78rem}.segmented input:checked+span{background:var(--primary);border-color:var(--primary);color:#fff}.checkbox-row{flex-direction:row!important;align-items:center;gap:10px!important}.checkbox-row input{width:18px;height:18px;accent-color:var(--primary)}.checkbox-row span{display:flex;flex-direction:column}.checkbox-row small{color:var(--muted);font-weight:400}.estimate{padding:10px 12px;background:var(--surface-2);border-radius:10px;color:var(--muted);font-size:.8rem}.primary-button,.secondary-button{display:inline-flex;justify-content:center;align-items:center;text-decoration:none;border-radius:12px;padding:13px 18px;font-weight:800}.primary-button{border:0;background:linear-gradient(135deg,var(--primary),#9b4dff);color:#fff;box-shadow:0 10px 24px rgba(109,74,255,.25)}.primary-button:hover{background:linear-gradient(135deg,var(--primary-2),#8738eb)}.primary-button:disabled{opacity:.55;cursor:not-allowed}.secondary-button{border:1px solid var(--border);background:var(--surface);color:var(--text)}.progress-panel,.result-panel{text-align:center;padding:50px 24px}.spinner{width:58px;height:58px;border:5px solid var(--surface-2);border-top-color:var(--primary);border-radius:50%;margin:0 auto 20px;animation:spin 1s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.progress-panel h3,.result-panel h3{margin:5px 0}.progress-panel p,.result-panel p{color:var(--muted)}.progress-track{height:11px;max-width:600px;margin:24px auto 7px;border-radius:999px;background:var(--surface-2);overflow:hidden}.progress-bar{height:100%;width:0;background:linear-gradient(90deg,var(--primary),#bd4fff);transition:width .2s}.progress-panel .secondary-button{margin-top:20px}.success-mark{width:62px;height:62px;margin:auto;border-radius:50%;display:grid;place-items:center;background:rgba(22,133,91,.13);color:var(--success);font-size:2rem;font-weight:900}.result-panel img{display:block;max-width:min(100%,700px);max-height:560px;margin:24px auto;border-radius:14px;border:1px solid var(--border);background:repeating-conic-gradient(#eee 0 25%,#fff 0 50%) 50%/20px 20px}.result-actions{display:flex;justify-content:center;gap:12px;flex-wrap:wrap}.error-box{margin-top:16px;padding:13px 15px;border-radius:12px;background:rgba(199,53,53,.1);color:var(--danger);border:1px solid rgba(199,53,53,.3)}.features,.info-section,.faq{max-width:1040px;margin:70px auto;padding:0 20px}.features{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.features article{padding:24px;border:1px solid var(--border);background:var(--surface);border-radius:18px}.features article>span{font-size:1.5rem}.features h3{margin:10px 0 5px}.features p,.steps small,.faq p{color:var(--muted)}.info-section h2,.faq h2{text-align:center;font-size:2rem}.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}.steps>div{display:flex;gap:13px}.steps b{flex:0 0 38px;height:38px;border-radius:12px;display:grid;place-items:center;background:rgba(109,74,255,.12);color:var(--primary)}.steps span{display:flex;flex-direction:column}.faq{max-width:820px}.faq details{border-bottom:1px solid var(--border);padding:18px 3px}.faq summary{font-weight:800;cursor:pointer}.faq p{margin-bottom:0}footer{max-width:1040px;margin:70px auto 0;padding:28px 20px 40px;border-top:1px solid var(--border);display:flex;justify-content:space-between;gap:20px;color:var(--muted);font-size:.82rem}.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}[hidden]{display:none!important}
@media(max-width:800px){.hero{margin-top:30px}.converter-shell{margin:0 12px;padding:14px;border-radius:20px}.workspace{grid-template-columns:1fr}.features,.steps{grid-template-columns:1fr}.drop-zone{min-height:270px}.segmented{grid-template-columns:repeat(2,1fr)}footer{flex-direction:column}}
@media(max-width:430px){.two-columns{grid-template-columns:1fr}.hero h1{font-size:2.7rem}.site-header{padding:16px}.preview-panel,.settings-panel{padding:15px}}