.oss-wrap{max-width:1000px;margin:30px auto;font-family:Arial,sans-serif;color:#222}.oss-card{background:#fff;border:1px solid #ddd;border-radius:10px;padding:24px;margin:18px 0;box-shadow:0 2px 8px rgba(0,0,0,.05)}.oss-card label{display:block;font-weight:600;margin:12px 0 5px}.oss-card input[type=text],.oss-card input[type=number]{width:100%;box-sizing:border-box;padding:11px;border:1px solid #ccc;border-radius:6px}.oss-card button,.oss-button{display:inline-block;margin-top:15px;padding:11px 18px;border:0;border-radius:6px;background:#1d4ed8;color:#fff;text-decoration:none;cursor:pointer}.oss-top{display:flex;justify-content:space-between;align-items:center;background:#f5f5f5;padding:15px;border-radius:8px}.oss-top button{padding:8px 14px}.oss-exam{border-top:1px solid #eee;padding:15px 0}.oss-done{display:inline-block;padding:8px;background:#e8f7ee;border-radius:5px}.oss-error{padding:12px;background:#fdecec;color:#a00;border-radius:6px}.oss-success{padding:12px;background:#eaf8ee;color:#176b2c;border-radius:6px}.oss-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}.oss-q{border:1px solid #eee;padding:12px;border-radius:6px}.oss-q label{display:inline-block;font-weight:normal;margin:0 8px}.oss-result{margin-top:12px}.oss-result table{width:100%;border-collapse:collapse}.oss-result td,.oss-result th{padding:7px;border-bottom:1px solid #eee;text-align:left}@media(max-width:700px){.oss-grid{grid-template-columns:1fr}.oss-top{gap:10px}.oss-wrap{margin:15px 8px}}

.oss-correct { background:#eaf7ea !important; }
.oss-wrong { background:#fdeaea !important; }
.oss-blank { background:#f4f4f4 !important; }