:root{--bg-top: #f5f4ec;--bg-bottom: #dce9f8;--panel: #ffffff;--ink: #1f2a37;--muted: #4f5f73;--accent: #005f73;--accent-strong: #003844;--warn: #a56a00;--error: #a0142f;--border: #d4dbe5}*{box-sizing:border-box}body{margin:0;min-height:100vh;font-family:IBM Plex Sans,Avenir Next,Segoe UI,sans-serif;color:var(--ink);background:radial-gradient(circle at 12% 20%,#fff8da 0%,transparent 34%),radial-gradient(circle at 85% 0%,#cde7ff 0%,transparent 28%),linear-gradient(180deg,var(--bg-top),var(--bg-bottom))}code{font-family:IBM Plex Mono,SFMono-Regular,Menlo,monospace;font-size:.9em}.page-shell{min-height:100vh;padding:3rem 1rem;display:grid;place-items:center}.panel{width:min(860px,100%);background:color-mix(in oklab,var(--panel) 94%,#f0f6ff 6%);border:1px solid var(--border);border-radius:18px;box-shadow:0 16px 30px #0c1c3414;padding:1.75rem}.panel-header h1{margin:.4rem 0 .5rem;font-size:clamp(1.45rem,2.2vw,2rem);letter-spacing:.01em}.eyebrow{margin:0;text-transform:uppercase;letter-spacing:.14em;font-size:.76rem;color:var(--accent)}.subtitle{margin:0;color:var(--muted)}.upload-form{margin-top:1.3rem;display:grid;gap:1rem}label{display:grid;gap:.35rem;font-weight:600}input[type=file]{border:1px dashed color-mix(in oklab,var(--accent) 35%,white 65%);border-radius:10px;background:#fff;padding:.8rem}button{justify-self:start;border:0;border-radius:10px;background:linear-gradient(135deg,var(--accent),var(--accent-strong));color:#fff;font-weight:700;padding:.75rem 1.2rem;cursor:pointer}button[disabled]{opacity:.6;cursor:not-allowed}.messages{margin-top:1.2rem;border:1px solid;border-radius:10px;padding:.8rem 1rem}.messages h2{margin:0 0 .35rem;font-size:1rem}.messages ul{margin:0;padding-left:1.1rem}.errors{border-color:color-mix(in oklab,var(--error) 40%,white 60%);background:color-mix(in oklab,var(--error) 10%,white 90%)}.warnings{border-color:color-mix(in oklab,var(--warn) 40%,white 60%);background:color-mix(in oklab,var(--warn) 14%,white 86%)}@media (max-width: 768px){.panel{padding:1.1rem;border-radius:14px}}