:root{--ink:#14203b;--muted:#68758d;--line:#dfe6f1;--soft:#f5f8fd;--blue:#3568f4;--blue-dark:#244fc7;--green:#2a9a58;--paper:#fdfdfc}*{box-sizing:border-box}html{scroll-behavior:smooth}body{color:var(--ink);background:var(--paper);margin:0;font-family:Arial,PingFang SC,Microsoft YaHei,sans-serif}a{color:inherit;text-decoration:none}button,input{font:inherit}button{cursor:pointer}.shell{width:min(1320px,100% - 64px);margin:0 auto}.topbar{justify-content:space-between;align-items:center;height:90px;display:flex}.logo{letter-spacing:-.045em;align-items:center;gap:10px;font-size:21px;font-weight:800;display:inline-flex}.logo-mark{background:#edf2ff;border-radius:10px;place-items:center;width:36px;height:36px;display:grid}.logo-mark img{width:24px;height:24px}.logo-subtitle{color:#8490a7;letter-spacing:0;padding-left:2px;font-size:13px;font-weight:500}.topnav{color:#52617b;align-items:center;gap:34px;font-size:14px;display:flex}.topnav a{transition:color .2s}.topnav a:hover{color:var(--blue)}.header-actions{align-items:center;gap:20px;display:flex}.language-switcher{color:#42516d;text-align:center;background:#fff;border:1px solid #dbe3f2;border-radius:7px;min-width:38px;padding:7px 9px;font-size:12px;font-weight:800}.language-switcher:hover{color:var(--blue);border-color:#aac0f8}.hero-layout{grid-template-columns:490px minmax(0,1fr);align-items:center;gap:clamp(48px,4vw,64px);padding:40px 0 84px;display:grid}.hero-intro{max-width:520px;transform:translateY(-18px)}.eyebrow,.section-kicker{width:max-content;color:var(--blue);letter-spacing:.025em;background:#edf2ff;border-radius:999px;margin:0 0 22px;padding:8px 12px;font-size:13px;font-weight:700}h1{letter-spacing:-.065em;margin:0;font-size:clamp(42px,3.75vw,54px);line-height:1.1}h1 span{color:var(--blue)}.hero-copy{color:var(--muted);margin:24px 0 36px;font-size:16px;line-height:1.8}.assurance-list{gap:19px;display:grid}.assurance{align-items:center;gap:15px;display:flex}.assurance>span{width:48px;height:48px;color:var(--blue);background:#eff3fe;border-radius:50%;flex:0 0 48px;place-items:center;display:grid}.assurance svg{stroke-width:1.85px;width:23px;height:23px}.assurance strong,.assurance small{display:block}.assurance strong{margin-bottom:4px;font-size:15px}.assurance small{color:var(--muted);font-size:13px}.ready-note{color:#548440;background:#f0f8eb;border-radius:8px;align-items:center;gap:8px;width:max-content;max-width:100%;margin:35px 0 0;padding:11px 14px;font-size:13px;display:flex}.ready-note svg{width:17px;height:17px}.converter-column{min-width:0}.hash-target{height:0;display:block;position:relative;top:-18px}.tool{border:1px solid var(--line);background:#fff;border-radius:18px;padding:14px;box-shadow:0 18px 44px #203d7812}.mode-switcher{background:#f2f5fa;border-radius:9px;gap:4px;margin:3px 3px 12px;padding:4px;display:inline-flex}.mode-switcher button{color:#69758a;background:0 0;border:0;border-radius:6px;align-items:center;gap:6px;min-height:34px;padding:0 11px;font-size:12px;font-weight:700;display:inline-flex}.mode-switcher button.active{color:var(--blue);background:#fff;box-shadow:0 1px 3px #1f355f1c}.mode-switcher svg{width:16px;height:16px}.dropzone{background:#fafcff;border:2px dashed #a8bbeb;border-radius:12px;place-items:center;min-height:350px;padding:32px 20px;transition:border-color .2s,background .2s;display:grid}.dropzone.active{border-color:var(--blue);background:#f0f4ff}.dropzone-content{text-align:center}.upload-icon{width:74px;height:74px;color:var(--blue);background:#e8eeff;border-radius:22px;place-items:center;margin:0 auto 21px;display:grid}.upload-icon svg{stroke-width:1.8px;width:32px;height:32px}.dropzone h2{letter-spacing:-.04em;margin:0;font-size:23px}.dropzone p{color:var(--muted);margin:11px 0 21px;font-size:14px}.primary,.secondary{border-radius:9px;justify-content:center;align-items:center;gap:8px;font-weight:700;transition:transform .18s,background .18s,border-color .18s;display:inline-flex}.primary{border:1px solid var(--blue);color:#fff;background:var(--blue);min-height:47px;padding:0 20px}.primary:hover{background:var(--blue-dark);border-color:var(--blue-dark);transform:translateY(-1px)}.primary svg{width:19px;height:19px}.file-note{color:#8290a7;margin-top:17px;font-size:12px;display:block}.auto-clear-note{color:#8290a7;margin-top:10px;font-size:11px;line-height:1.45;display:block}.file-input{display:none}.conversion{grid-template-columns:minmax(180px,250px) 1fr;align-items:center;gap:25px;min-height:485px;padding:16px;display:grid}.batch-preview{position:relative}.preview{object-fit:contain;border:1px solid var(--line);background:#f2f5fa;border-radius:11px;width:100%;max-height:255px}.batch-count{color:#fff;background:var(--blue);border-radius:50%;place-items:center;min-width:30px;height:30px;font-size:12px;font-weight:800;display:grid;position:absolute;bottom:8px;right:8px}.detail{min-width:0}.filename{text-overflow:ellipsis;white-space:nowrap;font-size:18px;font-weight:800;overflow:hidden}.filemeta{color:var(--muted);align-items:center;gap:6px;margin:7px 0 23px;font-size:13px;display:flex}.filemeta svg{width:15px;height:15px}.quality-row{justify-content:space-between;margin-bottom:9px;font-size:14px;font-weight:700;display:flex}.quality-value{color:var(--blue)}.range{width:100%;accent-color:var(--blue)}.quality-help{color:var(--muted);margin:8px 0 20px;font-size:12px;line-height:1.5}.actions{flex-wrap:wrap;gap:9px;display:flex}.secondary{border:1px solid var(--line);color:#4d5b75;background:#fff;min-height:47px;padding:0 16px}.secondary:hover{border-color:#aab8d4;transform:translateY(-1px)}.secondary.clear{color:#b5414d;border-color:#f0c6cb}.secondary.clear:hover{background:#fff7f7;border-color:#dc8993}.secondary.clear svg{width:17px;height:17px}.download{background:var(--green);border-color:var(--green)}.download:hover{background:#207e47;border-color:#207e47}.status{min-height:18px;color:var(--muted);margin:13px 0 0;font-size:13px}.status.error{color:#c33d4d}.result-list{gap:7px;max-height:135px;margin-top:13px;display:grid;overflow-y:auto}.result-download{color:#277647;background:#f7fcf8;border:1px solid #d8e7dc;border-radius:8px;grid-template-columns:18px minmax(0,1fr) auto;align-items:center;gap:7px;padding:9px 10px;font-size:12px;display:grid}.result-download:hover{border-color:#91c79f}.result-download svg{width:16px;height:16px}.result-download span{text-overflow:ellipsis;white-space:nowrap;font-weight:700;overflow:hidden}.result-download small{color:#63806e;font-size:11px}.spin{animation:.9s linear infinite spin}@keyframes spin{to{transform:rotate(360deg)}}.comparison{border:1px solid var(--line);background:#fff;border-radius:16px;margin-top:19px;padding:20px}.comparison-heading{justify-content:space-between;align-items:center;gap:20px;margin-bottom:16px;display:flex}.comparison-heading h2{letter-spacing:-.035em;margin:0;font-size:17px}.comparison-heading .section-kicker{color:#8090ad;background:0 0;margin:0 0 6px;padding:0;font-size:11px}.saved-badge{color:#397f48;white-space:nowrap;background:#ecf8ed;border-radius:7px;padding:7px 10px;font-size:12px;font-weight:700}.comparison-grid{grid-template-columns:1fr 39px 1fr;align-items:center;display:grid}.comparison-image{background:#f4f6fa;border:1px solid #e2e8f3;border-radius:10px;overflow:hidden}.comparison-image.converted{border-color:#cddafb}.image-label{color:#68758d;justify-content:space-between;gap:8px;padding:9px 10px;font-size:11px;font-weight:700;display:flex}.converted .image-label span:first-child{color:var(--blue)}.comparison-image img{object-fit:cover;width:100%;height:136px;display:block}.compare-arrow{z-index:1;width:39px;height:39px;color:var(--blue);background:#fff;border:1px solid #d7e1f4;border-radius:50%;place-items:center;margin:0 -1px;display:grid}.compare-arrow svg{width:19px;height:19px}.comparison-foot{color:#718098;align-items:center;gap:7px;margin:16px 0 0;font-size:12px;display:flex}.comparison-foot svg{width:16px;height:16px;color:var(--blue)}.content{border-top:1px solid var(--line);background:#fff;padding:80px 0 64px}.content-grid{grid-template-columns:1.1fr .9fr;gap:90px;display:grid}.content h2{letter-spacing:-.045em;margin:0 0 15px;font-size:29px}.content p,.content li{color:var(--muted);line-height:1.8}.content ol{padding-left:20px}.faq{border-top:1px solid var(--line)}.faq-item{border-bottom:1px solid var(--line);padding:16px 0}.faq-item h3{margin:0 0 7px;font-size:16px}.faq-item p{margin:0;font-size:14px}.facts{border-top:1px solid var(--line);margin-top:34px;padding-top:30px}.facts h2{margin-bottom:12px;font-size:24px}.fact-list{gap:13px;margin:19px 0 0;display:grid}.fact-list div{background:#fafcff;border:1px solid #e3e9f3;border-radius:10px;padding:13px 14px}.fact-list dt{color:var(--ink);margin-bottom:5px;font-size:14px;font-weight:800}.fact-list dd{color:var(--muted);margin:0;font-size:14px;line-height:1.65}.benefits-title{margin-top:32px!important}.benefits-list{gap:12px;margin:18px 0 0;padding:0;list-style:none;display:grid}.benefits-list li{align-items:flex-start;gap:9px;display:flex}.benefits-list svg{color:#279455;flex:none;width:18px;height:18px;margin-top:5px}.footer{color:#7c879c;justify-content:space-between;gap:18px;padding:26px 0 36px;font-size:13px;display:flex}@media (max-width:1100px){.hero-layout{grid-template-columns:1fr;gap:50px;padding-top:45px}.hero-intro{max-width:620px;transform:none}}@media (max-width:700px){.shell{width:min(100% - 30px,1320px)}.topbar{height:76px}.logo-subtitle,.topnav{display:none}.hero-layout{padding:35px 0 58px}h1{font-size:42px}.hero-copy{font-size:15px}.tool{border-radius:14px;padding:10px}.dropzone{min-height:330px}.conversion{grid-template-columns:1fr;min-height:330px;padding:8px}.preview{max-height:190px}.result-download{grid-template-columns:18px minmax(0,1fr)}.result-download small{grid-column:2}.comparison{padding:14px}.comparison-heading{align-items:flex-end}.comparison-heading h2{font-size:15px}.saved-badge{font-size:11px}.comparison-grid{grid-template-columns:1fr;gap:8px}.compare-arrow{margin:-14px auto;transform:rotate(90deg)}.comparison-image img{height:170px}.comparison-foot{align-items:flex-start;line-height:1.5}.content{padding-top:55px}.content-grid{grid-template-columns:1fr;gap:45px}.footer{flex-direction:column}}
