body {
    margin: 0;
    font-family: Arial, sans-serif;
    background: #f8f9fa;
    color: #222;
}
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 40px;
    background: #002147;
    color: white;
    position: sticky;
    top: 0;
    z-index: 10;
}
.header a { color: #cde3ff; margin-left: 20px; text-decoration: none; font-weight: bold; }
.main-content { padding: 40px; max-width: 1200px; margin: auto; }
.footer { text-align: center; padding: 20px; background: #002147; color: white; margin-top: 40px; }
.hero { text-align: center; padding: 80px 20px; background: linear-gradient(140deg, #00356b, #00509e); color: white; border-radius: 12px; }
.btn-primary { display: inline-block; background: #007bff; color: white; padding: 12px 24px; border-radius: 6px; margin-top: 20px; text-decoration: none; font-weight: bold; }
.section-title { margin-top: 40px; font-size: 26px; }
.demo-container { display: flex; gap: 20px; margin-top: 20px; }
.demo-card { flex: 1; background: white; border-radius: 10px; padding: 20px; box-shadow: 0 2px 8px rgba(0,0,0,0.1); transition: 0.2s; cursor: pointer; }
.demo-card:hover { transform: translateY(-5px); }
.viewer-layout { display: flex; gap: 30px; }
.image-viewer { flex: 1; background: white; padding: 20px; border-radius: 12px; box-shadow: 0 2px 8px rgba(0,0,0,0.1); }
#mri-canvas { width: 100%; height: 500px; background: black; display:block; }
.report-panel { width: 420px; background: white; padding: 20px; border-radius: 12px; box-shadow: 0 2px 8px rgba(0,0,0,0.1); }
.report-block { margin-bottom: 20px; }
.report-block textarea { width: 100%; padding: 10px; border-radius: 6px; }
.slider-box { margin-top: 10px; display:flex; align-items:center; gap:10px; }
.viewer-controls { margin-top: 10px; }