body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: #F8F9FA;
}

.header-gradient {
    background: linear-gradient(135deg, #007BFF, #0056b3);
}

.upload-zone {
    border: 2px dashed #007BFF;
    border-radius: 0.5rem;
    padding: 4rem;
    text-align: center;
    cursor: pointer;
    transition: background-color 0.2s ease-in-out;
}

.upload-zone.drag-over {
    background-color: #e9ecef;
}

.upload-zone .icon {
    width: 48px;
    height: 48px;
    stroke-width: 1.5;
    margin-bottom: 1rem;
}

.result-card {
    border-radius: 0.5rem;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

/* Auth Forms */
.auth-form {
    max-width: 400px;
    margin: 5rem auto;
    padding: 2rem;
    background: #fff;
    border-radius: 0.5rem;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

.auth-form h1 {
    text-align: center;
    margin-bottom: 1.5rem;
}

.form-group {
    margin-bottom: 1rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
}

.form-group input {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid #ced4da;
    border-radius: 0.25rem;
}

.btn {
    display: inline-block;
    font-weight: 400;
    line-height: 1.5;
    color: #fff;
    text-align: center;
    vertical-align: middle;
    cursor: pointer;
    user-select: none;
    background-color: #007bff;
    border: 1px solid #007bff;
    padding: 0.75rem 1.25rem;
    font-size: 1rem;
    border-radius: 0.25rem;
    transition: color .15s ease-in-out,background-color .15s ease-in-out,border-color .15s ease-in-out,box-shadow .15s ease-in-out;
    width: 100%;
}

.btn:hover {
    background-color: #0069d9;
    border-color: #0062cc;
}

.alert {
    padding: 1rem;
    margin-bottom: 1rem;
    border: 1px solid transparent;
    border-radius: 0.25rem;
}

.alert-danger {
    color: #721c24;
    background-color: #f8d7da;
    border-color: #f5c6cb;
}

.alert-success {
    color: #155724;
    background-color: #d4edda;
    border-color: #c3e6cb;
}

.upload-card {
    border-radius: 0.5rem;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    transition: transform 0.2s ease-in-out;
}

.upload-card:hover {
    transform: translateY(-5px);
}

.upload-card .card-img-top {
    aspect-ratio: 16 / 9;
    object-fit: cover;
}

.analysis-result {
    background-color: #f8f9fa;
    border-left: 3px solid #007BFF;
    padding: 0.5rem;
    margin-top: 0.5rem;
    font-size: 0.875rem;
    border-radius: 0.25rem;
}

.bounding-box {
    position: absolute;
    border: 2px solid #ff4d4d;
    background-color: rgba(255, 77, 77, 0.2);
    box-shadow: 0 0 5px rgba(255, 77, 77, 0.5);
    pointer-events: none; /* So it doesn't interfere with image interactions */
}