:root{--bg:#faf8f4;--surface:#fff;--surface-soft:#f1efe9;--line:#e7e4dc;--line-strong:#d3cec1;--text:#1c1b19;--muted:#5c584f;--subtle:#8a8579;--blue:#0b5cff;--blue-dark:#0847c9;--disabled:#ece8dd;--disabled-text:#a49f92;--success:#07875f;--shadow:0 18px 50px rgba(67,55,35,.07)}
html[data-theme="dark"]{--bg:#11110f;--surface:#1b1a17;--surface-soft:#25231e;--line:#34312b;--line-strong:#4b473e;--text:#f3f1ec;--muted:#a6a196;--subtle:#8f8a7c;--blue:#4e8eff;--blue-dark:#77a8ff;--disabled:#302e29;--disabled-text:#777269;--success:#45d6a8;--shadow:0 18px 50px rgba(0,0,0,.28)}
*{box-sizing:border-box}[hidden]{display:none!important}html{color-scheme:light}html[data-theme="dark"]{color-scheme:dark}body{margin:0;color:var(--text);background:var(--bg);font-family:"IBM Plex Sans",system-ui,-apple-system,"Segoe UI",sans-serif}button,input{font:inherit}a{color:inherit;text-decoration:none}.site-header{height:83px;border-bottom:1px solid var(--line)}.nav-shell{width:min(1152px,calc(100% - 64px));height:100%;margin:auto;display:flex;align-items:center;justify-content:space-between}.brand{display:flex;align-items:center;gap:10px;font-family:Sora,sans-serif;font-size:16px;font-weight:700}.brand-mark{width:28px;height:28px;display:grid;place-items:center;border-radius:7px;background:#17181c}.brand-mark svg{width:16px;height:16px;stroke:#faf8f4;stroke-width:2.1;stroke-linecap:round;stroke-linejoin:round}html[data-theme="dark"] .brand-mark{background:#f3f1ec}html[data-theme="dark"] .brand-mark svg{stroke:#17181c}.nav-actions{display:flex;align-items:center;gap:34px;font-size:14px;font-weight:500}.nav-actions a:hover{color:var(--blue)}.language{display:flex;align-items:center;gap:5px}.language select{width:46px;border:0;color:var(--text);background:transparent;cursor:pointer}.theme-button{width:34px;height:34px;border:1px solid var(--line);border-radius:8px;color:var(--text);background:transparent;cursor:pointer}.theme-button:hover{border-color:var(--blue)}
main{width:100%}.hero{padding:98px 24px 0;display:flex;flex-direction:column;align-items:center;text-align:center}.eyebrow{margin:0;color:var(--subtle);font-size:12px;font-weight:600;letter-spacing:.12em;text-transform:uppercase}.hero h1{margin:18px 0 20px;font-family:Sora,sans-serif;font-size:52px;line-height:1.08;letter-spacing:-.035em}.hero-copy{max-width:520px;margin:0 0 72px;color:var(--muted);font-size:18px;line-height:1.55}.format-demo{display:flex;align-items:center;gap:40px;padding:40px 56px;border:1px solid var(--line);border-radius:16px;background:var(--surface)}.format-stack{display:grid;gap:10px}.format-stack span{min-width:74px;padding:9px 18px;border-radius:8px;color:var(--muted);background:var(--surface-soft);font-size:13px;font-weight:600}.swap-mark{width:40px;height:40px;display:grid;place-items:center;border-radius:50%;background:var(--blue)}.swap-mark svg{width:18px;height:18px;stroke:#fff;stroke-width:2.1;stroke-linecap:round;stroke-linejoin:round}.format-caption{margin-top:16px;color:var(--subtle);font-size:12.5px}
.converter-card{width:min(620px,calc(100% - 32px));margin:120px auto 0;padding:44px 40px;display:flex;flex-direction:column;gap:28px;border:1px solid var(--line);border-radius:16px;background:var(--surface);box-shadow:var(--shadow)}.field-group{display:grid;gap:14px}.field-group h2,.format-fieldset legend{margin:0;color:var(--text);font-size:12.5px;font-weight:700;letter-spacing:.02em}.drop-zone{width:100%;padding:40px 24px;display:flex;flex-direction:column;align-items:center;gap:14px;border:1.5px dashed var(--line-strong);border-radius:12px;color:var(--text);background:transparent;text-align:center;cursor:pointer}.drop-zone:hover,.drop-zone:focus-visible{border-color:var(--blue);outline:none}.drop-zone.dragging{border-color:var(--blue);background:color-mix(in srgb,var(--blue) 6%,var(--surface))}.file-icon{width:34px;height:34px;stroke:var(--subtle);stroke-width:1.6;stroke-linecap:round;stroke-linejoin:round}.drop-title{font-size:15px;font-weight:600}.drop-copy,.drop-zone small{color:var(--subtle);font-size:12px}.choose-button{padding:11px 22px;border-radius:9px;color:#faf8f4;background:#17181c;font-size:14px;font-weight:600}html[data-theme="dark"] .choose-button{color:#17181c;background:#f3f1ec}.selected-file{padding:14px 16px;display:flex;align-items:center;justify-content:space-between;gap:18px;border:1px solid var(--line);border-radius:10px;background:var(--surface-soft)}.selected-file div{min-width:0;display:grid;gap:3px}.selected-file strong{overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-size:13px}.selected-file small{color:var(--subtle);font-size:11px}.selected-file button{padding:8px 12px;border:1px solid var(--line);border-radius:7px;color:var(--text);background:var(--surface);cursor:pointer}.divider{height:1px;background:var(--line)}.format-fieldset{min-width:0;margin:0;padding:0;border:0}.format-fieldset legend{margin-bottom:12px}.format-options{display:grid;grid-template-columns:repeat(4,1fr);gap:10px}.format-options label{cursor:pointer}.format-options input{position:absolute;opacity:0;pointer-events:none}.format-options span{display:block;padding:10px 8px;border:1px solid var(--line);border-radius:8px;color:var(--muted);font-size:14px;font-weight:500;text-align:center}.format-options input:checked+span{border:1.5px solid var(--blue);color:var(--blue);background:color-mix(in srgb,var(--blue) 12%,var(--surface));font-weight:600}.format-options input:focus-visible+span{outline:2px solid var(--blue);outline-offset:2px}.format-fieldset:disabled{opacity:.55}.privacy-note{padding:14px 16px;display:flex;align-items:flex-start;gap:11px;border-radius:10px;background:color-mix(in srgb,var(--blue) 6%,var(--bg))}.privacy-note svg{width:16px;height:16px;flex:0 0 auto;margin-top:1px;stroke:var(--blue);stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}.privacy-note div{display:grid;gap:2px}.privacy-note strong{font-size:13px}.privacy-note span{color:var(--muted);font-size:12px}.convert-button,.download-button{min-height:49px;padding:0 26px;display:flex;align-items:center;justify-content:center;gap:8px;border:0;border-radius:9px;font-size:14.5px;font-weight:600}.convert-button{color:#fff;background:var(--blue);cursor:pointer}.convert-button:hover:not(:disabled){background:var(--blue-dark)}.convert-button:disabled{color:var(--disabled-text);background:var(--disabled);cursor:not-allowed}.download-button{color:#fff;background:var(--success);cursor:pointer}.status{min-height:0;margin:-14px 0 0;color:var(--muted);font-size:12px;text-align:center}.status:empty{display:none}.status.error{color:#d14343}.status.success{color:var(--success)}
.features{padding:140px 64px;display:flex;flex-direction:column;align-items:center}.features h2{margin:16px 0 72px;font-family:Sora,sans-serif;font-size:32px;letter-spacing:-.02em;text-align:center}.feature-grid{width:min(1040px,100%);display:grid;grid-template-columns:repeat(3,1fr);gap:64px}.feature-grid article{display:flex;flex-direction:column;gap:16px}.feature-icon{color:var(--blue);font-size:27px;line-height:1}.feature-grid h3{margin:0;font-size:16px}.feature-grid p{margin:0;color:var(--muted);font-size:14.5px;line-height:1.6}footer{padding:28px max(32px,calc((100% - 1152px)/2));display:flex;align-items:center;justify-content:space-between;gap:24px;border-top:1px solid var(--line);color:var(--subtle);font-size:13px}footer nav{display:flex;gap:28px}footer a:hover{color:var(--blue)}
@media(max-width:700px){.site-header{height:64px}.nav-shell{width:calc(100% - 32px)}.nav-actions{gap:14px}.nav-actions a{display:none}.brand{font-size:15px}.hero{padding-top:58px}.hero h1{font-size:36px}.hero-copy{margin-bottom:48px;font-size:16px}.format-demo{gap:22px;padding:28px 32px}.converter-card{margin-top:72px;padding:28px 22px;gap:24px}.features{padding:96px 24px}.features h2{margin-bottom:48px;font-size:27px}.feature-grid{grid-template-columns:1fr;gap:42px}footer{padding:26px 20px;align-items:flex-start;flex-direction:column}footer nav{gap:20px}}
@media(max-width:420px){.format-demo{width:100%;justify-content:center;gap:16px;padding:24px 16px}.format-stack span{min-width:64px;padding:8px 12px}.format-options{grid-template-columns:repeat(2,1fr)}.converter-card{width:calc(100% - 24px);padding:24px 16px}.drop-zone{padding:34px 16px}.language>span{display:none}}
.convert-button.completed{background:color-mix(in srgb,var(--blue) 58%,var(--surface))}.convert-button.completed:hover,.convert-button.completed:focus-visible{background:color-mix(in srgb,var(--blue) 70%,var(--surface))}
.language:focus-within{border-radius:7px;box-shadow:0 0 0 1px var(--blue)}.language select:focus{outline:none}
.language select option{color:#1b1a17;background:#e3e0d9}html[data-theme="dark"] .language select option{color:#171714;background:#d8d5ce}
.download-choices{padding:14px;display:grid;grid-template-columns:1fr 1fr;gap:10px;border:1px solid var(--line);border-radius:12px;background:var(--surface-soft)}.download-choices[hidden]{display:none}.download-count{grid-column:1/-1;margin:0 0 2px;color:var(--muted);font-size:12px;font-weight:600;text-align:center}.download-choices .download-button{width:100%;text-decoration:none}.download-separate{background:var(--blue)}.download-zip{background:var(--success)}
@media(max-width:520px){.download-choices{grid-template-columns:1fr}}