:root{
  --bg:#f6f7f9;--bg-soft:#fbfbfc;--card:rgba(255,255,255,.92);--card-solid:#fff;--surface:#fff;--surface-soft:#f7f8fa;
  --text:#101114;--text-2:#4e5560;--muted:#727a88;--muted-2:#9299a5;--line:#e7e9ee;--line-strong:#d8dce4;
  --blue:#2563eb;--blue-dark:#174fca;--blue-soft:#eef4ff;--green:#1d9d68;
  --shadow:0 20px 60px rgba(26,34,55,.07);--shadow-lg:0 30px 90px rgba(26,34,55,.10);--button:#111318;--button-hover:#222631;
  --checker:#eff1f4;--danger-bg:#fff0f1;--danger-text:#af3340;--danger-line:#ffd7dc;
}
html[data-theme="dark"]{
  --bg:#090a0b;--bg-soft:#090a0b;--card:#111214;--card-solid:#111214;--surface:#151618;--surface-soft:#0e0f11;
  --text:#f4f5f7;--text-2:#d6d8dd;--muted:#a8adb6;--muted-2:#858b96;--line:#25272b;--line-strong:#34373d;
  --blue:#5f8fff;--blue-dark:#76a0ff;--blue-soft:#17233d;--green:#4bc08b;
  --shadow:0 18px 54px rgba(0,0,0,.24);--shadow-lg:0 28px 80px rgba(0,0,0,.32);--button:#f3f4f6;--button-hover:#fff;
  --checker:#1a1c20;--danger-bg:#2a1518;--danger-text:#ff9ca8;--danger-line:#55242a;
}
*{box-sizing:border-box}
html{font-family:Inter,"SF Pro Display","PingFang SC","Microsoft YaHei",Arial,sans-serif;background:var(--bg);color:var(--text);scroll-behavior:smooth}
body{margin:0;min-height:100vh;overflow-x:hidden;background:linear-gradient(180deg,var(--bg-soft) 0,var(--bg) 44%,var(--bg) 100%);transition:background .2s ease,color .2s ease}
html[data-theme="dark"] body{background:#090a0b}
button,input,select{font:inherit}button,a,label{-webkit-tap-highlight-color:transparent}.top-progress{position:fixed;z-index:1000;left:0;top:0;height:3px;width:0;background:linear-gradient(90deg,#2563eb,#76a4ff);box-shadow:0 0 18px rgba(37,99,235,.35);transition:width .2s ease,opacity .3s}
.ambient{position:fixed;border-radius:999px;filter:blur(10px);pointer-events:none;z-index:0;opacity:.4}.ambient-a{width:340px;height:340px;right:-120px;top:100px;background:radial-gradient(circle,rgba(56,117,255,.13),rgba(56,117,255,0) 70%)}.ambient-b{width:300px;height:300px;left:-120px;top:520px;background:radial-gradient(circle,rgba(123,78,255,.08),rgba(123,78,255,0) 70%)}
html[data-theme="dark"] .ambient{display:none}
.page{position:relative;z-index:1;width:min(1100px,calc(100% - 40px));margin:0 auto;padding:24px 0 48px}.site-header{height:64px;display:flex;align-items:center;justify-content:space-between;gap:20px}.brand{display:flex;align-items:center;gap:11px;color:inherit;text-decoration:none}.brand-mark{width:42px;height:42px;border-radius:13px;display:grid;place-items:center;background:#111318;color:#fff;box-shadow:0 10px 24px rgba(13,17,25,.15)}html[data-theme="dark"] .brand-mark{background:#f3f4f6;color:#0b0c0e;box-shadow:none}.brand-mark svg{width:21px;height:21px;fill:none;stroke:currentColor;stroke-width:1.9;stroke-linecap:round;stroke-linejoin:round}.brand-copy{display:flex;flex-direction:column;line-height:1.05}.brand-copy b{font-size:15px;letter-spacing:.1px}.brand-copy small{font-size:10px;letter-spacing:1.25px;color:var(--muted-2);text-transform:uppercase;margin-top:5px}
.theme-toggle{width:42px;height:42px;border:1px solid var(--line);background:var(--card);color:var(--text);border-radius:13px;display:grid;place-items:center;cursor:pointer;box-shadow:0 8px 24px rgba(24,31,46,.05);transition:.18s ease}.theme-toggle:hover{transform:translateY(-1px);border-color:var(--line-strong)}html[data-theme="dark"] .theme-toggle{box-shadow:none;background:#111214}.theme-icon{width:19px;height:19px;display:none}.theme-icon svg{width:100%;height:100%;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}html[data-theme="light"] .moon-icon{display:block}html[data-theme="dark"] .sun-icon{display:block}
.hero{text-align:center;padding:74px 20px 52px}.eyebrow{display:inline-flex;align-items:center;justify-content:center;height:30px;padding:0 12px;border:1px solid var(--line);border-radius:999px;background:var(--card);font-size:11px;font-weight:800;letter-spacing:1.55px;color:var(--muted);box-shadow:0 5px 20px rgba(35,44,65,.04)}html[data-theme="dark"] .eyebrow{box-shadow:none}.hero h1{margin:18px 0 16px;font-size:clamp(38px,6vw,66px);line-height:1.02;letter-spacing:-3.2px;font-weight:800}.hero h1 span{color:var(--blue)}.hero p{max-width:680px;margin:0 auto;color:var(--muted);font-size:16px;line-height:1.8}.hero-tags{display:flex;justify-content:center;gap:8px;flex-wrap:wrap;margin-top:24px}.hero-tags span{font-size:11px;color:var(--muted);background:var(--surface);border:1px solid var(--line);padding:7px 10px;border-radius:8px;box-shadow:0 5px 18px rgba(34,42,60,.035)}html[data-theme="dark"] .hero-tags span{box-shadow:none}
.alert{padding:14px 16px;border-radius:14px;margin:0 0 16px;font-size:13px}.danger{background:var(--danger-bg);color:var(--danger-text);border:1px solid var(--danger-line)}
.workspace{display:grid;grid-template-columns:minmax(0,.82fr) minmax(0,1.18fr);gap:16px;align-items:start}.panel{position:relative;background:var(--card);backdrop-filter:blur(22px);border:1px solid var(--line);border-radius:26px;padding:28px;box-shadow:var(--shadow)}html[data-theme="dark"] .panel{backdrop-filter:none}.section-kicker{position:absolute;right:26px;top:24px;font-size:11px;color:var(--muted-2);font-weight:800;letter-spacing:1.3px}.section-copy h2{font-size:21px;margin:0 0 7px;letter-spacing:-.5px}.section-copy p{font-size:13px;line-height:1.6;color:var(--muted);margin:0}
.dropzone{min-height:384px;margin-top:24px;border:1.5px dashed var(--line-strong);border-radius:22px;background:linear-gradient(180deg,var(--surface),var(--surface-soft));display:flex;align-items:center;justify-content:center;flex-direction:column;padding:24px;gap:16px;cursor:pointer;transition:.22s ease;overflow:hidden;position:relative}.dropzone::after{content:"";position:absolute;inset:0;pointer-events:none;background:radial-gradient(circle at 50% 0,rgba(37,99,235,.055),transparent 44%)}html[data-theme="dark"] .dropzone::after{display:none}.dropzone:hover,.dropzone.drag{border-color:#7e9fe8;background:var(--blue-soft);transform:translateY(-2px);box-shadow:0 18px 44px rgba(37,99,235,.07)}html[data-theme="dark"] .dropzone:hover,html[data-theme="dark"] .dropzone.drag{box-shadow:none}.dropzone input{display:none}.preview-shell{width:118px;height:118px;border-radius:28px;border:1px solid var(--line);background:var(--surface);display:grid;place-items:center;overflow:hidden;box-shadow:0 16px 36px rgba(29,40,63,.08);position:relative;z-index:1;transition:.2s}.preview-shell.has-image{width:176px;height:176px;border-radius:24px;background:linear-gradient(45deg,var(--checker) 25%,transparent 25%),linear-gradient(-45deg,var(--checker) 25%,transparent 25%),linear-gradient(45deg,transparent 75%,var(--checker) 75%),linear-gradient(-45deg,transparent 75%,var(--checker) 75%);background-color:var(--surface);background-size:18px 18px;background-position:0 0,0 9px,9px -9px,-9px 0}html[data-theme="dark"] .preview-shell{box-shadow:none}.upload-icon{width:54px;height:54px;border-radius:18px;background:var(--blue-soft);display:grid;place-items:center;color:var(--blue)}.upload-icon svg{width:25px;height:25px;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}.imagePreview,#imagePreview{width:100%;height:100%;display:none;object-fit:contain}.preview-shell.has-image #imagePreview{display:block}.preview-shell.has-image .upload-icon{display:none}.upload-copy{text-align:center;position:relative;z-index:1}.upload-copy strong{display:block;max-width:310px;font-size:15px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.upload-copy small{display:block;color:var(--muted-2);font-size:12px;margin-top:7px}.choose-btn{position:relative;z-index:1;height:38px;display:inline-flex;align-items:center;padding:0 16px;border-radius:10px;background:var(--button);color:#fff;font-size:12px;font-weight:700}html[data-theme="dark"] .choose-btn{color:#0b0c0e}
.group{padding-top:24px;margin-top:24px;border-top:1px solid var(--line)}.first-group{margin-top:26px}.group-headline{display:flex;flex-direction:column;gap:4px}.group-headline>span{font-size:14px;font-weight:750}.group-headline>small{font-size:11px;line-height:1.5;color:var(--muted-2)}.group-row{display:flex;justify-content:space-between;align-items:end;gap:16px}.ghost-btn{border:0;background:var(--surface-soft);color:var(--text-2);border-radius:9px;height:32px;padding:0 11px;cursor:pointer;font-size:11px;transition:.16s}.ghost-btn:hover{background:var(--line);color:var(--text)}
.format-grid{display:grid;grid-template-columns:repeat(6,1fr);gap:8px;margin-top:12px}.format-grid input,.size-grid input,.radio-card input{display:none}.format-grid>label>span{height:64px;border:1px solid var(--line);border-radius:14px;background:var(--surface);display:flex;align-items:center;justify-content:center;flex-direction:column;gap:4px;cursor:pointer;transition:.16s}.format-grid b{font-size:13px}.format-grid em{font-style:normal;font-size:11px;color:var(--muted-2)}.format-grid input:checked+span{border-color:#759aee;background:var(--blue-soft);box-shadow:inset 0 0 0 1px rgba(37,99,235,.08),0 8px 20px rgba(37,99,235,.06);color:var(--blue)}html[data-theme="dark"] .format-grid input:checked+span{box-shadow:none}.format-grid input:checked+span em{color:var(--blue)}
.size-grid{display:grid;grid-template-columns:repeat(8,1fr);gap:8px;margin-top:12px}.size-grid>label>span{height:52px;border:1px solid var(--line);border-radius:13px;background:var(--surface);display:flex;align-items:center;justify-content:center;gap:2px;cursor:pointer;font-size:12px;font-weight:700;transition:.16s}.size-grid>label>span small{font-size:10px;color:var(--muted-2);font-weight:500}.size-grid input:checked+span{border-color:#759aee;background:var(--blue-soft);color:var(--blue);box-shadow:inset 0 0 0 1px rgba(37,99,235,.08)}html[data-theme="dark"] .size-grid input:checked+span{box-shadow:none}.size-grid input:checked+span small{color:var(--blue)}
.mode-row{display:grid;grid-template-columns:1fr 1fr;gap:9px;margin-top:10px}.radio-card>span{min-height:76px;border:1px solid var(--line);background:var(--surface);border-radius:14px;display:flex;align-items:center;gap:11px;padding:13px;cursor:pointer;transition:.16s}.radio-dot{width:17px;height:17px;border-radius:50%;border:1.5px solid var(--line-strong);position:relative;flex:none}.radio-card>span>span{display:flex;flex-direction:column;gap:4px}.radio-card b{font-size:12px}.radio-card small{font-size:11px;line-height:1.5;color:var(--muted-2)}.radio-card input:checked+span{border-color:#759aee;background:var(--blue-soft)}.radio-card input:checked+span .radio-dot{border-color:var(--blue)}.radio-card input:checked+span .radio-dot::after{content:"";position:absolute;inset:3px;border-radius:50%;background:var(--blue)}
.select-row{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-top:12px}.field{display:flex;flex-direction:column;gap:7px}.field>span{font-size:11px;color:var(--muted)}.field select,.number-field{width:100%;height:46px;border:1px solid var(--line);border-radius:12px;background:var(--surface);padding:0 12px;outline:none;color:var(--text-2);font-size:12px}.field select:focus,.number-field:focus-within{border-color:#7e9fe8;box-shadow:0 0 0 3px rgba(37,99,235,.08)}.number-field{display:flex;align-items:center}.number-field input{border:0;outline:0;width:100%;background:transparent;color:var(--text-2)}.number-field i{font-style:normal;color:var(--muted-2)}
.primary{width:100%;height:52px;border:0;border-radius:14px;background:var(--button);color:#fff;margin-top:24px;display:flex;align-items:center;justify-content:center;gap:9px;font-size:13px;font-weight:800;cursor:pointer;transition:.18s;box-shadow:0 12px 26px rgba(13,17,25,.14)}html[data-theme="dark"] .primary{color:#0b0c0e;box-shadow:none}.primary svg{width:17px;height:17px;fill:none;stroke:currentColor;stroke-width:1.9;stroke-linecap:round;stroke-linejoin:round}.primary:hover{background:var(--button-hover);transform:translateY(-1px);box-shadow:0 16px 32px rgba(13,17,25,.18)}html[data-theme="dark"] .primary:hover{box-shadow:none}.primary:disabled{opacity:.45;cursor:not-allowed;transform:none}.privacy-note{text-align:center;color:var(--muted-2);font-size:11px;line-height:1.5;margin-top:12px}.privacy-note span{color:var(--green);margin-right:4px}
.inline-notice{margin-top:12px;padding:11px 13px;border-radius:10px;background:var(--danger-bg);color:var(--danger-text);font-size:12px;border:1px solid var(--danger-line);text-align:center}
.hidden{display:none!important}.result-panel{margin-top:16px;padding-bottom:18px}.result-heading>div{display:flex;align-items:center;gap:11px}.result-heading h2{font-size:17px;margin:0 0 3px}.result-heading p{font-size:11px;color:var(--muted-2);margin:0}.success-icon{width:36px;height:36px;border-radius:11px;background:#ebf8f2;color:var(--green);display:grid;place-items:center;font-weight:800}html[data-theme="dark"] .success-icon{background:#13271f}.result-item{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:15px 0;border-top:1px solid var(--line)}.result-item:first-child{margin-top:18px}.result-meta{min-width:0}.result-meta b{display:block;font-size:12px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.result-meta small{display:block;color:var(--muted-2);font-size:11px;margin-top:4px}.download{flex:none;text-decoration:none;color:#fff;background:var(--blue);padding:10px 14px;border-radius:9px;font-size:11px;font-weight:700;transition:.16s}.download:hover{background:var(--blue-dark)}
.site-footer{margin-top:36px;border-top:1px solid var(--line);padding:26px 2px 0;color:var(--muted)}.footer-main{display:flex;align-items:center;justify-content:space-between;gap:20px}.footer-main b{font-size:13px;color:var(--text-2)}.footer-main p{font-size:11px;line-height:1.55;margin:6px 0 0}.footer-main a{display:inline-flex;align-items:center;gap:5px;text-decoration:none;color:var(--text-2);background:var(--surface);border:1px solid var(--line);border-radius:10px;padding:10px 13px;font-size:11px;font-weight:700;transition:.16s}.footer-main a:hover{color:var(--blue);border-color:#759aee;transform:translateY(-1px)}.footer-bottom{display:flex;align-items:center;justify-content:center;gap:8px;padding-top:28px;font-size:11px;color:var(--muted-2)}.footer-dot{width:3px;height:3px;background:var(--line-strong);border-radius:50%}
@media(max-width:900px){.workspace{grid-template-columns:1fr}.dropzone{min-height:290px}.hero{padding-top:58px}.format-grid{grid-template-columns:repeat(6,1fr)}}
@media(max-width:680px){.page{width:min(100% - 20px,1100px);padding-top:10px}.site-header{height:60px;padding:0 4px}.brand-copy b{font-size:14px}.brand-copy small{font-size:10px}.theme-toggle{width:40px;height:40px}.hero{padding:44px 10px 34px}.hero h1{font-size:40px;letter-spacing:-2.1px}.hero p{font-size:14px;line-height:1.75}.panel{padding:20px;border-radius:21px}.section-kicker{right:20px;top:19px}.format-grid{grid-template-columns:repeat(3,1fr)}.size-grid{grid-template-columns:repeat(4,1fr)}.mode-row,.select-row{grid-template-columns:1fr}.dropzone{min-height:250px;border-radius:18px}.preview-shell{width:96px;height:96px;border-radius:23px}.preview-shell.has-image{width:148px;height:148px}.footer-main{align-items:flex-start}.footer-bottom{flex-wrap:wrap;text-align:center;line-height:1.8}.site-footer{padding-left:4px;padding-right:4px}}
@media(max-width:390px){.hero h1{font-size:34px}.size-grid{grid-template-columns:repeat(4,1fr)}.group-row{align-items:center}.ghost-btn{white-space:nowrap}.footer-main p{max-width:220px}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{scroll-behavior:auto!important;transition:none!important}}