:root{--bg: #f5f5f7;--surface: #ffffff;--surface-inset: #f5f5f7;--text: #1d1d1f;--text-muted: #6e6e73;--text-subtle: #86868b;--accent: #0071e3;--accent-hover: #0077ed;--accent-soft: #e8f1fd;--border: #d2d2d7;--border-light: #e8e8ed;--danger: #d70015;--danger-soft: #fdecec;--danger-border: #f3b9b7;--radius-xl: 28px;--radius-lg: 20px;--radius: 14px;--radius-pill: 980px;--shadow-card: 0 4px 24px rgba(0, 0, 0, .04), 0 1px 4px rgba(0, 0, 0, .04);--shadow-focus: 0 0 0 4px var(--accent-soft);font-family:-apple-system,BlinkMacSystemFont,SF Pro Display,SF Pro Text,Helvetica Neue,PingFang SC,Microsoft YaHei,system-ui,sans-serif;color:var(--text);font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}*{box-sizing:border-box}body{margin:0;min-width:320px;min-height:100vh;background:var(--bg)}button,select{font:inherit}.page{height:100dvh;display:flex;align-items:center;justify-content:center;overflow:hidden;padding:24px 22px}.container{width:100%;max-width:640px}.hero{text-align:center}.logo{display:block;margin:0 auto;width:clamp(48px,8vh,72px);height:clamp(48px,8vh,72px)}.eyebrow{margin:0;color:var(--accent);font-size:15px;font-weight:600;letter-spacing:.01em}h1{margin:clamp(6px,1.5vh,12px) 0 0;font-size:clamp(32px,6vw,64px);font-weight:600;line-height:1.05;letter-spacing:-.025em}.lede{margin:clamp(8px,1.6vh,18px) auto 0;max-width:520px;color:var(--text-muted);font-size:clamp(15px,2.4vw,21px);font-weight:400;line-height:1.5}.workspace{margin-top:clamp(20px,3.5vh,52px);padding:clamp(18px,3vh,36px);background:var(--surface);border-radius:var(--radius-xl);box-shadow:var(--shadow-card)}.browser-warning{display:flex;align-items:center;gap:10px;margin-bottom:22px;padding:14px 16px;border:1px solid var(--danger-border);border-radius:var(--radius);background:var(--danger-soft);color:var(--danger);font-size:14px;line-height:1.5}.browser-warning svg{flex-shrink:0;width:20px;height:20px}.dropzone{display:flex;flex-direction:column;align-items:center;text-align:center;gap:14px;padding:clamp(24px,4.5vh,52px) 24px;border:1.5px dashed var(--border);border-radius:var(--radius-lg);background:var(--surface-inset);cursor:pointer;transition:border-color .2s ease,background .2s ease,box-shadow .2s ease}.dropzone:hover,.dropzone.is-dragging{border-color:var(--accent);background:var(--accent-soft)}.dropzone.is-dragging{box-shadow:var(--shadow-focus)}.dropzone input{display:none}.dropzone.is-disabled{pointer-events:none;opacity:.55}.dropzone-icon{display:grid;place-items:center;width:64px;height:64px;border-radius:50%;background:var(--surface);color:var(--accent);box-shadow:0 2px 10px #0000000f}.dropzone-icon svg{width:30px;height:30px}.dropzone-title{margin:0;font-size:19px;font-weight:600;letter-spacing:-.01em}.dropzone-hint{margin:0;color:var(--text-subtle);font-size:14px}.dropzone.is-filled{flex-direction:row;align-items:center;text-align:left;gap:16px;padding:18px 20px;border-style:solid;border-color:var(--border-light);background:var(--surface)}.dropzone.is-filled:hover{border-color:var(--accent);background:var(--accent-soft)}.dropzone-file-icon{display:grid;place-items:center;flex-shrink:0;width:48px;height:48px;border-radius:var(--radius);background:var(--surface-inset);color:var(--accent)}.dropzone.is-filled:hover .dropzone-file-icon{background:var(--surface)}.dropzone-file-icon svg{width:24px;height:24px}.dropzone-summary{flex:1;min-width:0;display:flex;flex-direction:column;gap:4px}.dropzone-summary strong{font-size:16px;font-weight:600;letter-spacing:-.01em;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.dropzone-summary>span{color:var(--text-subtle);font-size:13px}.dropzone-rechoose{flex-shrink:0;padding:8px 16px;border-radius:var(--radius-pill);background:var(--surface-inset);color:var(--accent);font-size:14px;font-weight:500}.dropzone.is-filled:hover .dropzone-rechoose{background:var(--surface)}.link-btn{display:block;margin:18px auto 0;padding:4px 8px;border:0;background:none;color:var(--accent);font-size:15px;font-weight:500;cursor:pointer}.link-btn:hover{text-decoration:underline}.selector{margin-top:clamp(16px,3vh,26px);display:grid;gap:8px}.selector span{color:var(--text-muted);font-size:14px;font-weight:500}.selector select{width:100%;min-height:48px;padding:0 40px 0 16px;border:1px solid var(--border);border-radius:var(--radius);background:var(--surface);color:var(--text);cursor:pointer;appearance:none;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%236e6e73' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 14px center}.selector select:focus{outline:none;border-color:var(--accent);box-shadow:var(--shadow-focus)}.stats{display:grid;grid-template-columns:repeat(3,1fr);margin-top:clamp(16px,3vh,26px);padding:4px 0;border-radius:var(--radius);background:var(--surface-inset)}.stats div{padding:16px 18px;text-align:center;border-right:1px solid var(--border-light)}.stats div:last-child{border-right:0}.stats span{display:block;margin-bottom:8px;color:var(--text-subtle);font-size:12px;font-weight:500;letter-spacing:.02em}.stats strong{font-size:22px;font-weight:600;line-height:1}.btn-primary{margin-top:clamp(18px,3vh,28px);width:100%;min-height:52px;border:0;border-radius:var(--radius-pill);background:var(--accent);color:#fff;font-size:17px;font-weight:500;cursor:pointer;transition:background .2s ease,transform .08s ease}.btn-primary:hover:not(:disabled){background:var(--accent-hover)}.btn-primary:active:not(:disabled){transform:scale(.99)}.btn-primary:disabled{cursor:not-allowed;background:#e8e8ed;color:var(--text-subtle)}.message{min-height:20px;margin:16px 0 0;text-align:center;color:var(--text-muted);font-size:14px;line-height:1.5}.message.bad{color:var(--danger)}@media(max-width:440px){.stats{grid-template-columns:1fr}.stats div{border-right:0;border-bottom:1px solid var(--border-light)}.stats div:last-child{border-bottom:0}}