html,body{min-height:100%}body{margin:0;font-family:Inter,system-ui,sans-serif;background-image:url(/student-bg.jpg),radial-gradient(circle at top left,rgba(37,99,235,.22),transparent 24%),radial-gradient(circle at bottom right,rgba(250,204,21,.22),transparent 22%),linear-gradient(180deg,#fff,#f8fbff,#eff6ff);background-position:center center,center,center,center;background-size:cover,auto,auto,auto;background-repeat:no-repeat,no-repeat,no-repeat,no-repeat;background-attachment:scroll;color:#1f2937}*{box-sizing:border-box}.app-shell{width:min(100%,720px);margin:0 auto;padding:20px 16px 32px;background:#ffffffe0;-webkit-backdrop-filter:blur(18px);backdrop-filter:blur(18px);box-shadow:0 24px 60px #0f172a1f}h1{margin-bottom:8px;font-size:clamp(2rem,6vw,2.8rem);color:#1d4ed8}h2{color:#1d4ed8}.intro{margin:0 0 18px;color:#475569;line-height:1.6}.status{margin:0 0 18px;color:#4b5563;white-space:pre-line}.camera-card,.preview-card{background:#fff;border:1px solid rgba(37,99,235,.18);border-radius:20px;padding:18px;box-shadow:0 20px 45px #2563eb14}.video-preview,.photo-preview{width:100%;border-radius:18px;object-fit:cover;min-height:320px;background:#111827}button{border:none;border-radius:14px;font-size:1rem;padding:14px 20px;cursor:pointer;transition:transform .15s ease,box-shadow .15s ease}.primary-button{background:#1d4ed8;color:#fff;box-shadow:0 10px 20px #3b82f63d}.secondary-button{background:#f8fafc;color:#111827;border:1px solid #cbd5e1}.button-row{display:flex;gap:12px;margin-top:16px;flex-wrap:wrap}.error{margin-bottom:14px;color:#b91c1c}.success{margin-top:14px;color:#166534}@media(max-width:720px){.app-shell{padding:16px 14px 28px}.camera-card,.preview-card{padding:16px}button{width:100%}.button-row{flex-direction:column}}