*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}:root{--bg: #f5f5f5;--surface: #ffffff;--text: #1a1a1a;--text-muted: #666666;--border: #e0e0e0;--accent: #1a1a1a;--accent-hover: #333333;--success: #2d6a4f;--error: #c1121f;--warning-bg: #fff8e6;--warning-border: #f0d78c;--radius: 12px;--shadow: 0 2px 8px rgba(0, 0, 0, .06)}body{font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;background:var(--bg);color:var(--text);line-height:1.5;min-height:100vh}.app{max-width:720px;margin:0 auto;padding:2rem 1.5rem 1.5rem;min-height:100vh;display:flex;flex-direction:column}.header{display:flex;align-items:center;gap:1.5rem;margin-bottom:2rem;padding-bottom:1.5rem;border-bottom:1px solid var(--border)}.logo{height:72px;width:auto;flex-shrink:0}.header-text h1{font-size:1.5rem;font-weight:600;letter-spacing:-.02em}.subtitle{color:var(--text-muted);font-size:.9rem;margin-top:.25rem}.main{flex:1}.dropzone{background:var(--surface);border:2px dashed var(--border);border-radius:var(--radius);padding:3rem 2rem;text-align:center;cursor:pointer;transition:border-color .15s,background .15s;box-shadow:var(--shadow)}.dropzone:hover,.dropzone:focus-visible,.dropzone.dragover{border-color:var(--accent);background:#fafafa;outline:none}.dropzone-icon{color:var(--text-muted);margin-bottom:1rem}.dropzone-title{font-size:1.1rem;font-weight:500;margin-bottom:.35rem}.dropzone-hint{color:var(--text-muted);font-size:.875rem}.file-section{margin-top:1.5rem}.file-section-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:.75rem}.file-section-header h2{font-size:1rem;font-weight:600}.file-list{list-style:none;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow)}.file-item{display:grid;grid-template-columns:1fr auto auto;gap:1rem;align-items:center;padding:.75rem 1rem;border-bottom:1px solid var(--border);font-size:.875rem}.file-item:last-child{border-bottom:none}.file-name{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.file-size{color:var(--text-muted);white-space:nowrap}.file-status{font-weight:500;white-space:nowrap;min-width:5.5rem;text-align:right}.file-status.pending{color:var(--text-muted)}.file-status.converting{color:var(--text)}.file-status.done{color:var(--success)}.file-status.error{color:var(--error)}.warning{margin-top:1rem;padding:.75rem 1rem;background:var(--warning-bg);border:1px solid var(--warning-border);border-radius:var(--radius);font-size:.875rem;color:#7a5c00}.progress-section{margin-top:1.25rem}.progress-label{font-size:.875rem;color:var(--text-muted);margin-bottom:.5rem}.progress-bar{height:6px;background:var(--border);border-radius:3px;overflow:hidden}.progress-fill{height:100%;background:var(--accent);border-radius:3px;width:0%;transition:width .2s ease}.actions{display:flex;gap:.75rem;margin-top:1.25rem;flex-wrap:wrap}.btn{font-family:inherit;font-size:.9rem;font-weight:500;padding:.65rem 1.25rem;border-radius:8px;border:none;cursor:pointer;transition:background .15s,opacity .15s}.btn:disabled{opacity:.45;cursor:not-allowed}.btn-primary{background:var(--accent);color:#fff}.btn-primary:not(:disabled):hover{background:var(--accent-hover)}.btn-secondary{background:var(--surface);color:var(--text);border:1px solid var(--border)}.btn-secondary:not(:disabled):hover{background:#f0f0f0}.btn-ghost{background:transparent;color:var(--text-muted);padding:.35rem .75rem;font-size:.8rem}.btn-ghost:hover{color:var(--text)}.info{margin-top:2rem;padding:1rem 1.25rem;background:var(--surface);border-radius:var(--radius);border:1px solid var(--border);font-size:.8rem;color:var(--text-muted)}.info p+p{margin-top:.5rem}.footer{margin-top:2rem;padding-top:1.5rem;border-top:1px solid var(--border);text-align:center;font-size:.8rem;color:var(--text-muted);letter-spacing:.04em;text-transform:lowercase}.hidden{display:none!important}@media(max-width:520px){.header{flex-direction:column;align-items:flex-start;gap:1rem}.logo{height:56px}.file-item{grid-template-columns:1fr;gap:.25rem}.file-status{text-align:left}}