*, *::before, *::after{box-sizing:border-box;margin:0;padding:0}
:root{--bg:#181818;--surface:#242424;--border:#313131;--text:#ffffffe0;--text-secondary:#999;--success:#2ec4b6;--error:#ff6b6b;--radius:8px;--shadow:0 1px 4px rgba(0,0,0,.3);--surface-raised:#313131;--code-bg:#111;--code-text:#cdd6f4;--error-bg:#2d1b1b;--error-border:#5c2a2a;--warning-bg:#2d2b1b;--warning-border:#5c5a2a;--overlay:rgba(255,255,255,.08)}
[data-theme="bright"]{--bg:#f0f0f0;--surface:#fff;--border:#d0d0d0;--text:#333;--text-secondary:#777;--success:#1a9e8f;--shadow:0 1px 4px rgba(0,0,0,.1);--surface-raised:#e8e8e8;--code-bg:#f5f5f5;--code-text:#333;--error-bg:#fde8e8;--error-border:#f5c6c6;--warning-bg:#fef3cd;--warning-border:#f5e48c;--overlay:rgba(0,0,0,.06)}
body{font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;background:var(--bg);color:var(--text);line-height:1.6;min-height:100vh}
header{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:16px 24px;text-align:center;margin-bottom:16px}
header h1{font-size:20px;font-weight:500;color:var(--text)}
header p{font-size:13px;color:var(--text-secondary);margin-top:2px}
header code{background:var(--overlay);padding:1px 5px;border-radius:3px;font-size:12px}
main{margin:0;padding:0}
.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:24px;margin-bottom:16px;box-shadow:var(--shadow)}
.drop-zone{border:2px dashed var(--border);border-radius:var(--radius);padding:48px 24px;text-align:center;cursor:pointer;transition:border-color .2s,background .2s}
.drop-zone:hover,.drop-zone.drag-over{border-color:var(--primary);background:color-mix(in srgb,var(--primary) 4%,transparent)}
.drop-zone-icon{font-size:40px;margin-bottom:8px;display:block}
.drop-zone-text{font-size:15px;font-weight:500}
.drop-zone-hint{font-size:12px;color:var(--text-secondary);margin-top:4px}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);border:0}
.file-list{display:flex;flex-wrap:wrap;gap:6px;margin-top:12px}
.file-tag{display:inline-flex;align-items:center;gap:4px;background:var(--surface-raised);padding:4px 10px;border-radius:4px;font-size:12px;color:var(--text)}
.file-tag-remove{cursor:pointer;opacity:.5;font-size:14px;line-height:1}
.file-tag-remove:hover{opacity:1}
.settings-row{display:flex;gap:12px;align-items:center;flex-wrap:wrap}
.settings-row label{font-size:13px;font-weight:500;white-space:nowrap;color:var(--text)}
.settings-row input,.settings-row select{padding:6px 10px;border:1px solid var(--border);border-radius:4px;font-size:13px;background:var(--bg);color:var(--text)}
.settings-row input:focus,.settings-row select:focus{outline:none;border-color:var(--primary)}
.settings-row input[type="text"]{flex:1;min-width:120px}
.btn{display:inline-flex;align-items:center;gap:6px;padding:8px 20px;border:none;border-radius:6px;font-size:14px;font-weight:500;cursor:pointer;transition:background .2s}
.btn-primary{background:var(--primary);color:#000}
.btn-primary:hover{background:var(--primary-hover)}
.btn-primary:disabled{opacity:.35;cursor:not-allowed}
.btn-success{background:var(--success);color:#000}
.btn-success:hover{opacity:.85}
.btn-outline{background:transparent;border:1px solid var(--border);color:var(--text)}
.btn-outline:hover{background:var(--surface-raised)}
.size-toggle{display:inline-flex;align-items:center;gap:4px;cursor:pointer;user-select:none}
.size-toggle input{display:none}
.size-label{font-size:13px;color:var(--text-secondary);padding:4px 10px;border:1px solid var(--border);border-radius:4px;transition:background .15s,color .15s}
.size-toggle input:checked+.size-label{background:color-mix(in srgb,var(--primary) 10%,transparent);color:var(--primary);border-color:var(--primary)}
.size-input{width:72px!important;padding:4px 8px!important;font-size:13px!important}
.mapping-toggle{display:inline-flex;align-items:center;gap:8px;cursor:pointer;user-select:none}
.mapping-toggle input{display:none}
.mapping-label{font-size:13px;color:var(--text-secondary);transition:color .2s}
#mappingToggle:not(:checked)~.mapping-label-a,#mappingToggle:checked~.mapping-label-pua{color:var(--primary);font-weight:600}
.mapping-track{width:36px;height:20px;background:#555;border-radius:10px;position:relative;transition:background .2s}
#mappingToggle:checked~.mapping-track{background:var(--primary)}
.mapping-thumb{position:absolute;top:2px;left:2px;width:16px;height:16px;background:#fff;border-radius:50%;transition:transform .2s}
#mappingToggle:checked~.mapping-track .mapping-thumb{transform:translateX(16px)}
.status{margin-top:12px;padding:10px 14px;border-radius:6px;font-size:13px}
.status code{background:var(--overlay);padding:1px 4px;border-radius:3px;font-size:12px}
.status-info{background:color-mix(in srgb,var(--primary) 8%,transparent);border:1px solid color-mix(in srgb,var(--primary) 20%,transparent);color:var(--primary)}
.status-error{background:var(--error-bg);border:1px solid var(--error-border);color:var(--error)}
.status-warning{background:var(--warning-bg);border:1px solid var(--warning-border);color:var(--text)}
.hidden{display:none!important}
footer{text-align:center;padding:24px;font-size:12px;color:var(--text-secondary)}
.actions{display:flex;gap:8px;flex-wrap:wrap}
.error-msg{background:var(--error-bg);border:1px solid var(--error-border);color:var(--error);padding:10px 14px;border-radius:6px;font-size:13px;margin-top:12px}
.loading{text-align:center;padding:24px;color:var(--text-secondary)}
.spinner{display:inline-block;width:24px;height:24px;border:3px solid var(--border);border-top-color:var(--primary);border-radius:50%;animation:spin .6s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}
.preview-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(72px,1fr));gap:8px;margin-top:12px}
.preview-item{display:flex;flex-direction:column;align-items:center;gap:4px;padding:12px 4px 8px;border:1px solid var(--border);border-radius:6px;background:var(--bg)}
.preview-label{font-size:10px;color:var(--text-secondary);text-align:center;word-break:break-all;max-width:100%}
.css-snippet{background:var(--code-bg);color:var(--code-text);padding:16px;border-radius:6px;border:1px solid var(--border);font-family:'SF Mono','Fira Code','Cascadia Code','JetBrains Mono',monospace;font-size:12px;line-height:1.5;overflow-x:auto;white-space:pre;margin-top:12px;position:relative}
.copy-btn{position:absolute;top:8px;right:8px;background:var(--overlay);border:1px solid var(--border);color:var(--code-text);padding:4px 10px;border-radius:4px;font-size:11px;cursor:pointer}
.copy-btn:hover{background:rgba(255,255,255,.15)}