:root{--border:#e5e7eb;--text:#111418;--muted:#667085;--surface:#fff;--primary:#2196f3}
@media(prefers-color-scheme:dark){:root{--surface:#14171a;--text:#e6e6e6;--muted:#9aa4b2;--border:#2b3036}}
*{box-sizing:border-box}
body{margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,Noto Sans,sans-serif;background:#0b0c0f;color:var(--text)}
.container{max-width:980px;margin:0 auto;padding:1rem}
header h1{display:flex;gap:.5rem;align-items:center;margin:.5rem 0}
.subtitle{color:var(--muted);margin:.25rem 0 1rem}
.panel{background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:1rem;margin:1rem 0}
.row{display:flex;align-items:center;justify-content:space-between;gap:.75rem;flex-wrap:wrap}
.tools{display:flex;gap:.5rem}
.btn{border:1px solid var(--border);background:transparent;color:var(--text);padding:.55rem .9rem;border-radius:8px;cursor:pointer}
.btn:hover{border-color:var(--primary);color:var(--primary)}
.btn.primary{background:var(--primary);border-color:var(--primary);color:#fff}
.btn.file-btn{position:relative;overflow:hidden}
.btn.file-btn input{position:absolute;inset:0;opacity:0}
textarea{width:100%;min-height:140px;resize:vertical;border:1px solid var(--border);border-radius:8px;padding:.75rem;background:transparent;color:inherit}
textarea:focus,input:focus,select:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px rgba(33,150,243,.15)}
.hint{color:var(--muted)}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:.75rem;margin-top:.5rem}
label{display:flex;flex-direction:column;gap:.35rem;font-weight:500}
input[type="text"],input[type="number"],select{padding:.55rem;border:1px solid var(--border);border-radius:8px;background:transparent;color:inherit}
.checkbox{display:flex;gap:.5rem;align-items:center;margin-top:1.6rem}
.muted{color:var(--muted)}